Makefile - missing separator

You need to precede the lines starting with gcc and rm with a hard tab. Commands in make rules are required to start with a tab (unless they follow a semicolon on the same line). The result should look like this:

PROG = semsearch
all: $(PROG)
%: %.c
        gcc -o $@ $< -lpthread

clean:
        rm $(PROG)

Note that some editors may be configured to insert a sequence of spaces instead of a hard tab. If there are spaces at the start of these lines you'll also see the "missing separator" error. If you do have problems inserting hard tabs, use the semicolon way:

PROG = semsearch
all: $(PROG)
%: %.c ; gcc -o $@ $< -lpthread

clean: ; rm $(PROG)

add elements to object array

You can't. However, you can replace the array with a new one which contains the extra element.

But it is easier and gives better performance to use an List<T> (uses interface IList) for this. List<T> does not resize the array every time you add an item - instead it doubles it when needed.

Try:

class Student
{
    IList<Subject> subjects = new List<Subject>();
}

class Subject
{
    string Name;
    string referenceBook;
}

Now you can say:

someStudent.subjects.Add(new Subject());

How do I get the currently displayed fragment?

How can I expose more than 1 port with Docker?

Step1

In your Dockerfile, you can use the verb EXPOSE to expose multiple ports.
e.g.

EXPOSE 3000 80 443 22

Step2

You then would like to build an new image based on above Dockerfile.
e.g.

docker build -t foo:tag .

Step3

Then you can use the -p to map host port with the container port, as defined in above EXPOSE of Dockerfile.
e.g.

docker run -p 3001:3000 -p 23:22

In case you would like to expose a range of continuous ports, you can run docker like this:

docker run -it -p 7100-7120:7100-7120/tcp

What is a good game engine that uses Lua?

I can second the previous posters enthusiasm for the Gideros Lua game engine, whilst focusing currently on Mobile (iOS and Android - Windows phone 8 is in the works), desktop support for Mac, PC (possibly Linux) is also planned for the not too distant future.

Google for "Gideros Mobile"

How to change dot size in gnuplot

Use the pointtype and pointsize options, e.g.

plot "./points.dat" using 1:2 pt 7 ps 10

where pt 7 gives you a filled circle and ps 10 is the size.

See: Plotting data.

ASP.NET jQuery Ajax Calling Code-Behind Method

This hasn't solved my problem too, so I changed the parameters slightly.
This code worked for me:

var dataValue = "{ name: 'person', isGoing: 'true', returnAddress: 'returnEmail' }";

$.ajax({
    type: "POST",
    url: "Default.aspx/OnSubmit",
    data: dataValue,
    contentType: 'application/json; charset=utf-8',
    dataType: 'json',
    error: function (XMLHttpRequest, textStatus, errorThrown) {
        alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown);
    },
    success: function (result) {
        alert("We returned: " + result.d);
    }
});

How to export the Html Tables data into PDF using Jspdf

Here is an example I think that will help you

<!DOCTYPE html>
<html>
<head>
<script src="js/min.js"></script>
<script src="js/pdf.js"></script>
<script>
    $(function(){
         var doc = new jsPDF();
    var specialElementHandlers = {
        '#editor': function (element, renderer) {
            return true;
        }
    };

   $('#cmd').click(function () {

        var table = tableToJson($('#StudentInfoListTable').get(0))
        var doc = new jsPDF('p','pt', 'a4', true);
        doc.cellInitialize();
        $.each(table, function (i, row){
            console.debug(row);
            $.each(row, function (j, cell){
                doc.cell(10, 50,120, 50, cell, i);  // 2nd parameter=top margin,1st=left margin 3rd=row cell width 4th=Row height
            })
        })


        doc.save('sample-file.pdf');
    });
    function tableToJson(table) {
    var data = [];

    // first row needs to be headers
    var headers = [];
    for (var i=0; i<table.rows[0].cells.length; i++) {
        headers[i] = table.rows[0].cells[i].innerHTML.toLowerCase().replace(/ /gi,'');
    }


    // go through cells
    for (var i=0; i<table.rows.length; i++) {

        var tableRow = table.rows[i];
        var rowData = {};

        for (var j=0; j<tableRow.cells.length; j++) {

            rowData[ headers[j] ] = tableRow.cells[j].innerHTML;

        }

        data.push(rowData);
    }       

    return data;
}
});
</script>
</head>
<body>
<div id="table">
<table id="StudentInfoListTable">
                <thead>
                    <tr>    
                        <th>Name</th>
                        <th>Email</th>
                        <th>Track</th>
                        <th>S.S.C Roll</th>
                        <th>S.S.C Division</th>
                        <th>H.S.C Roll</th>
                        <th>H.S.C Division</th>
                        <th>District</th>

                    </tr>
                </thead>
                <tbody>

                        <tr>
                            <td>alimon  </td>
                            <td>Email</td>
                            <td>1</td>
                            <td>2222</td>
                            <td>as</td>
                            <td>3333</td>
                            <td>dd</td>
                            <td>33</td>
                        </tr>               
                </tbody>
            </table>
<button id="cmd">Submit</button>
</body>
</html>

Here the output

enter image description here

Writing numerical values on the plot with Matplotlib

Use pyplot.text() (import matplotlib.pyplot as plt)

import matplotlib.pyplot as plt

x=[1,2,3]
y=[9,8,7]

plt.plot(x,y)
for a,b in zip(x, y): 
    plt.text(a, b, str(b))
plt.show()

merge two object arrays with Angular 2 and TypeScript?

try this

 data => {
                this.results = [...this.results, ...data.results];
                this._next = data.next;
            }

Combine two pandas Data Frames (join on a common column)

You can use merge to combine two dataframes into one:

import pandas as pd
pd.merge(restaurant_ids_dataframe, restaurant_review_frame, on='business_id', how='outer')

where on specifies field name that exists in both dataframes to join on, and how defines whether its inner/outer/left/right join, with outer using 'union of keys from both frames (SQL: full outer join).' Since you have 'star' column in both dataframes, this by default will create two columns star_x and star_y in the combined dataframe. As @DanAllan mentioned for the join method, you can modify the suffixes for merge by passing it as a kwarg. Default is suffixes=('_x', '_y'). if you wanted to do something like star_restaurant_id and star_restaurant_review, you can do:

 pd.merge(restaurant_ids_dataframe, restaurant_review_frame, on='business_id', how='outer', suffixes=('_restaurant_id', '_restaurant_review'))

The parameters are explained in detail in this link.

Nodemailer with Gmail and NodeJS

first install nodemailer

npm install nodemailer  --save

import in to js file

const nodemailer = require("nodemailer");

const smtpTransport = nodemailer.createTransport({
    service: "Gmail",
    auth: {
        user: "[email protected]",
        pass: "password"
    },
    tls: {
        rejectUnauthorized: false
    }
});






 const mailOptions = {
        from: "[email protected]",
        to: [email protected],
        subject: "Welcome to ",
        text: 'hai send from me'.
    };


    smtpTransport.sendMail(mailOptions, function (error, response) {
        if (error) {
            console.log(error);
        }
        else {
            console.log("mail sent");
        }
    });

working in my application

ASP.NET set hiddenfield a value in Javascript

My understanding is if you set controls.Visible = false during initial page load, it doesn't get rendered in the client response. My suggestion to solve your problem is

Don't use placeholder, judging from the scenario, you don't really need a placeholder, unless you need to dynamically add controls on the server side. Use div, without runat=server. You can always controls the visiblity of that div using css. If you need to add controls dynamically later, use placeholder, but don't set visible = false. Placeholder won't have any display anyway, Set the visibility of that placeholder using css. Here's how to do it programmactically :

placeholderId.Attributes["style"] = "display:none";

Anyway, as other have stated, your problems occurs because once you set control.visible = false, it doesn't get rendered in the client response.

Checking for empty queryset in Django

Since version 1.2, Django has QuerySet.exists() method which is the most efficient:

if orgs.exists():
    # Do this...
else:
    # Do that...

But if you are going to evaluate QuerySet anyway it's better to use:

if orgs:
   ...

For more information read QuerySet.exists() documentation.

How to right align widget in horizontal linear layout Android?

Try This..

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:orientation="horizontal" 
    android:gravity="right" >



    <TextView android:text="TextView" android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </TextView>

</LinearLayout>

Program "make" not found in PATH

In MinGW, I had to install the following things:

Basic Setup -> mingw32-base  
Basic Setup -> mingw32-gcc-g++  
Basic Setup -> msys-base

And in Eclipse, go to

Windows -> Preferences -> C/C++ -> Build -> Environment

And set the following environment variables (with "Append variables to native environment" option set):

MINGW_HOME   C:\MinGW
PATH   C:\MinGW\bin;C:\MinGW\msys\1.0\bin

Click "Apply" and then "OK".

This worked for me, as far as I can tell.

how to wait for first command to finish?

Shell scripts, no matter how they are executed, execute one command after the other. So your code will execute results.sh after the last command of st_new.sh has finished.

Now there is a special command which messes this up: &

cmd &

means: "Start a new background process and execute cmd in it. After starting the background process, immediately continue with the next command in the script."

That means & doesn't wait for cmd to do it's work. My guess is that st_new.sh contains such a command. If that is the case, then you need to modify the script:

cmd &
BACK_PID=$!

This puts the process ID (PID) of the new background process in the variable BACK_PID. You can then wait for it to end:

while kill -0 $BACK_PID ; do
    echo "Process is still active..."
    sleep 1
    # You can add a timeout here if you want
done

or, if you don't want any special handling/output simply

wait $BACK_PID

Note that some programs automatically start a background process when you run them, even if you omit the &. Check the documentation, they often have an option to write their PID to a file or you can run them in the foreground with an option and then use the shell's & command instead to get the PID.

Running Python on Windows for Node.js dependencies

For me, these steps fixed the issue:

1- Running this cmd as admin:

npm install --global --production windows-build-tools

2- Then running npm rebuild after the 1st step is completed (especially completing the python 2.7 installation, which was the main cause of the issue)

jquery (or pure js) simulate enter key pressed for testing

Demo Here

var e = jQuery.Event("keypress");
e.which = 13; //choose the one you want
e.keyCode = 13;
$("#theInputToTest").trigger(e);

What is the best way to test for an empty string in Go?

Just to add more to comment

Mainly about how to do performance testing.

I did testing with following code:

import (
    "testing"
)

var ss = []string{"Hello", "", "bar", " ", "baz", "ewrqlosakdjhf12934c r39yfashk fjkashkfashds fsdakjh-", "", "123"}

func BenchmarkStringCheckEq(b *testing.B) {
    c := 0
    b.ResetTimer()
    for n := 0; n < b.N; n++ {
            for _, s := range ss {
                    if s == "" {
                            c++
                    }
            }
    } 
    t := 2 * b.N
    if c != t {
            b.Fatalf("did not catch empty strings: %d != %d", c, t)
    }
}
func BenchmarkStringCheckLen(b *testing.B) {
    c := 0
    b.ResetTimer()
    for n := 0; n < b.N; n++ {
            for _, s := range ss { 
                    if len(s) == 0 {
                            c++
                    }
            }
    } 
    t := 2 * b.N
    if c != t {
            b.Fatalf("did not catch empty strings: %d != %d", c, t)
    }
}
func BenchmarkStringCheckLenGt(b *testing.B) {
    c := 0
    b.ResetTimer()
    for n := 0; n < b.N; n++ {
            for _, s := range ss {
                    if len(s) > 0 {
                            c++
                    }
            }
    } 
    t := 6 * b.N
    if c != t {
            b.Fatalf("did not catch empty strings: %d != %d", c, t)
    }
}
func BenchmarkStringCheckNe(b *testing.B) {
    c := 0
    b.ResetTimer()
    for n := 0; n < b.N; n++ {
            for _, s := range ss {
                    if s != "" {
                            c++
                    }
            }
    } 
    t := 6 * b.N
    if c != t {
            b.Fatalf("did not catch empty strings: %d != %d", c, t)
    }
}

And results were:

% for a in $(seq 50);do go test -run=^$ -bench=. --benchtime=1s ./...|grep Bench;done | tee -a log
% sort -k 3n log | head -10

BenchmarkStringCheckEq-4        150149937            8.06 ns/op
BenchmarkStringCheckLenGt-4     147926752            8.06 ns/op
BenchmarkStringCheckLenGt-4     148045771            8.06 ns/op
BenchmarkStringCheckNe-4        145506912            8.06 ns/op
BenchmarkStringCheckLen-4       145942450            8.07 ns/op
BenchmarkStringCheckEq-4        146990384            8.08 ns/op
BenchmarkStringCheckLenGt-4     149351529            8.08 ns/op
BenchmarkStringCheckNe-4        148212032            8.08 ns/op
BenchmarkStringCheckEq-4        145122193            8.09 ns/op
BenchmarkStringCheckEq-4        146277885            8.09 ns/op

Effectively variants usually do not reach fastest time and there is only minimal difference (about 0.01ns/op) between variant top speed.

And if I look full log, difference between tries is greater than difference between benchmark functions.

Also there does not seem to be any measurable difference between BenchmarkStringCheckEq and BenchmarkStringCheckNe or BenchmarkStringCheckLen and BenchmarkStringCheckLenGt even if latter variants should inc c 6 times instead of 2 times.

You can try to get some confidence about equal performance by adding tests with modified test or inner loop. This is faster:

func BenchmarkStringCheckNone4(b *testing.B) {
    c := 0
    b.ResetTimer()
    for n := 0; n < b.N; n++ {
            for _, _ = range ss {
                    c++
            }
    }
    t := len(ss) * b.N
    if c != t {
            b.Fatalf("did not catch empty strings: %d != %d", c, t)
    }
}

This is not faster:

func BenchmarkStringCheckEq3(b *testing.B) {
    ss2 := make([]string, len(ss))
    prefix := "a"
    for i, _ := range ss {
            ss2[i] = prefix + ss[i]
    }
    c := 0
    b.ResetTimer()
    for n := 0; n < b.N; n++ {
            for _, s := range ss2 {
                    if s == prefix {
                            c++
                    }
            }
    }
    t := 2 * b.N
    if c != t {
            b.Fatalf("did not catch empty strings: %d != %d", c, t)
    }
}

Both variants are usually faster or slower than difference between main tests.

It would also good to generate test strings (ss) using string generator with relevant distribution. And have variable lengths too.

So I don't have any confidence of performance difference between main methods to test empty string in go.

And I can state with some confidence, it is faster not to test empty string at all than test empty string. And also it is faster to test empty string than to test 1 char string (prefix variant).

How to run a specific Android app using Terminal?

I keep this build-and-run script handy, whenever I am working from command line:

#!/usr/bin/env bash

PACKAGE=com.example.demo
ACTIVITY=.MainActivity
APK_LOCATION=app/build/outputs/apk/app-debug.apk
echo "Package: $PACKAGE"

echo "Building the project with tasks: $TASKS"
./gradlew $TASKS

echo "Uninstalling $PACKAGE"
adb uninstall $PACKAGE

echo "Installing $APK_LOCATION"
adb install $APK_LOCATION

echo "Starting $ACTIVITY"
adb shell am start -n $PACKAGE/$ACTIVITY

Activating Anaconda Environment in VsCode

Simply use

shift + cmd + P
Search Select Interpreter

Select it and it will show you the list of your virtual environment created via conda and other python versions

select the environment and you are ready to go.

Quoting the 'Select and activate an environment' docs

Selecting an interpreter from the list adds an entry for python.pythonPath with
the path to the interpreter inside your Workspace Settings.

Adding rows to tbody of a table using jQuery

("#tblEntAttributes tbody")

needs to be

$("#tblEntAttributes tbody").

You are not selecting the element with the correct syntax

Here's an example of both

$(newRowContent).appendTo($("#tblEntAttributes"));

and

$("#tblEntAttributes tbody").append(newRowContent);

working http://jsfiddle.net/xW4NZ/

Regex to check whether a string contains only numbers

This function checks if it's input is numeric in the classical sense, as one expects a normal number detection function to work.

It's a test one can use for HTML form input, for example.

It bypasses all the JS folklore, like tipeof(NaN) = number, parseint('1 Kg') = 1, booleans coerced into numbers, and the like.

It does it by rendering the argument as a string and checking that string against a regex like those by @codename- but allowing entries like 5. and .5

function isANumber( n ) {
    var numStr = /^-?(\d+\.?\d*)$|(\d*\.?\d+)$/;
    return numStr.test( n.toString() );
}

not numeric:
Logger.log( 'isANumber( "aaa" ): ' + isANumber( 'aaa' ) );
Logger.log( 'isANumber( "" ): ' + isANumber( '' ) );
Logger.log( 'isANumber( "lkjh" ): ' + isANumber( 'lkjh' ) );
Logger.log( 'isANumber( 0/0 ): ' + isANumber( 0 / 0 ) );
Logger.log( 'isANumber( 1/0 ): ' + isANumber( 1 / 0 ) );
Logger.log( 'isANumber( "1Kg" ): ' + isANumber( '1Kg' ) );
Logger.log( 'isANumber( "1 Kg" ): ' + isANumber( '1 Kg' ) );
Logger.log( 'isANumber( false ): ' + isANumber( false ) );
Logger.log( 'isANumber( true ): ' + isANumber( true ) );

numeric:
Logger.log( 'isANumber( "0" ): ' + isANumber( '0' ) );
Logger.log( 'isANumber( "12.5" ): ' + isANumber( '12.5' ) );
Logger.log( 'isANumber( ".5" ): ' + isANumber( '.5' ) );
Logger.log( 'isANumber( "5." ): ' + isANumber( '5.' ) );
Logger.log( 'isANumber( "-5" ): ' + isANumber( '-5' ) );
Logger.log( 'isANumber( "-5." ): ' + isANumber( '-5.' ) );
Logger.log( 'isANumber( "-.5" ): ' + isANumber( '-5.' ) );
Logger.log( 'isANumber( "1234567890" ): ' + isANumber( '1234567890' ));

Explanation of the regex:

/^-?(\d+\.?\d*)$|(\d*\.?\d+)$/

The initial "^" and the final "$" match the start and the end of the string, to ensure the check spans the whole string. The "-?" part is the minus sign with the "?" multiplier that allows zero or one instance of it.

Then there are two similar groups, delimited by parenthesis. The string has to match either of these groups. The first matches numbers like 5. and the second .5

The first group is

\d+\.?\d*

The "\d+" matches a digit (\d) one or more times.
The "\.?" is the decimal point (escaped with "\" to devoid it of its magic), zero or one times.

The last part "\d*" is again a digit, zero or more times.
All the parts are optional but the first digit, so this group matches numbers like 5. and not .5 which are matched by the other half.

What is the difference between public, protected, package-private and private in Java?

My two cents :)

private:

class -> a top level class cannot be private. inner classes can be private which are accessible from same class.

instance variable -> accessible only in the class. Cannot access outside the class.

package-private:

class -> a top level class can be package-private. It can only be accessible from same package. Not from sub package, not from outside package.

instance variable -> accessible from same package. Not from sub package, not from outside package.

protected:

class -> a top level class cannot be protected.

instance variable -> Only accessible in same package or subpackage. Can only be access outside the package while extending class.

public:

class -> accessible from package/subpackage/another package

instance variable -> accessible from package/subpackage/another package

Here is detailed answer

https://github.com/junto06/java-4-beginners/blob/master/basics/access-modifier.md

Grep for beginning and end of line?

The tricky part is a regex that includes a dash as one of the valid characters in a character class. The dash has to come immediately after the start for a (normal) character class and immediately after the caret for a negated character class. If you need a close square bracket too, then you need the close square bracket followed by the dash. Mercifully, you only need dash, hence the notation chosen.

grep '^[-d]rwx.*[0-9]$' "$@"

See: Regular Expressions and grep for POSIX-standard details.

A server is already running. Check …/tmp/pids/server.pid. Exiting - rails

server.pid only contains the process ID of the running server.

If you do:

more /your_project_path/tmp/pids/server.pid

you will get a number (say 6745) which you can use to stop the previous server with the command kill:

kill -9 6745

and then you can remove the file with the rm command

rm /your_project_path/tmp/pids/server.pid

System.Runtime.InteropServices.COMException (0x800A03EC)

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

I went on folders

C:\Windows\ System32\config\SystemProfile

and

C:\Windows\SysWOW64\config\SystemProfile

are protected system folders, they usually have the lock.

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

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

Display alert message and redirect after click on accept

that worked but try it this way.

echo "<script>
alert('There are no fields to generate a report');
window.location.href='admin/ahm/panel';  
</script>";

alert on top then location next

Displaying standard DataTables in MVC

While I tried the approach above, it becomes a complete disaster with mvc. Your controller passing a model and your view using a strongly typed model become too difficult to work with.

Get your Dataset into a List ..... I have a repository pattern and here is an example of getting a dataset from an old school asmx web service private readonly CISOnlineSRVDEV.ServiceSoapClient _ServiceSoapClient;

    public Get_Client_Repository()
        : this(new CISOnlineSRVDEV.ServiceSoapClient())
    {

    }
    public Get_Client_Repository(CISOnlineSRVDEV.ServiceSoapClient serviceSoapClient)
    {
        _ServiceSoapClient = serviceSoapClient;
    }


    public IEnumerable<IClient> GetClient(IClient client)
    {
        // ****  Calling teh web service with passing in the clientId and returning a dataset
        DataSet dataSet = _ServiceSoapClient.get_clients(client.RbhaId,
                                                        client.ClientId,
                                                        client.AhcccsId,
                                                        client.LastName,
                                                        client.FirstName,
                                                        "");//client.BirthDate.ToString());  //TODO: NEED TO FIX

        // USE LINQ to go through the dataset to make it easily available for the Model to display on the View page
        List<IClient> clients = (from c in dataSet.Tables[0].AsEnumerable()
                                 select new Client()
                                 {
                                     RbhaId = c[5].ToString(),
                                     ClientId = c[2].ToString(),
                                     AhcccsId = c[6].ToString(),
                                     LastName = c[0].ToString(), // Add another field called   Sex M/F  c[4]
                                     FirstName = c[1].ToString(),
                                     BirthDate = c[3].ToDateTime()  //extension helper  ToDateTime()
                                 }).ToList<IClient>();

        return clients;

    }

Then in the Controller I'm doing this

IClient client = (IClient)TempData["Client"];

// Instantiate and instance of the repository 
var repository = new Get_Client_Repository();
// Set a model object to return the dynamic list from repository method call passing in the parameter data
var model = repository.GetClient(client);

// Call the View up passing in the data from the list
return View(model);

Then in the View it is easy :

@model IEnumerable<CISOnlineMVC.DAL.IClient>

@{
    ViewBag.Title = "CLIENT ALL INFORMATION";
}

<h2>CLIENT ALL INFORMATION</h2>

<table>
    <tr>
        <th></th>
        <th>Last Name</th>
        <th>First Name</th>
        <th>Client ID</th>
        <th>DOB</th>
        <th>Gender</th>
        <th>RBHA ID</th>
        <th>AHCCCS ID</th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.ActionLink("Select", "ClientDetails", "Cis", new { id = item.ClientId }, null) |
        </td>
        <td>
            @item.LastName
        </td>
        <td>
            @item.FirstName
        </td>
         <td>
            @item.ClientId
        </td>
         <td>
            @item.BirthDate
        </td>
         <td>
            Gender @* ADD in*@
        </td>
         <td>
            @item.RbhaId
        </td>
         <td>
            @item.AhcccsId
        </td>
    </tr>
}

</table>

Is it possible to capture a Ctrl+C signal and run a cleanup function, in a "defer" fashion?

All of the above seem to work when spliced in, but gobyexample's signals page has a really clean and complete example of signal capturing. Worth adding to this list.

Swift performSelector:withObject:afterDelay: is unavailable

Swift 4

DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
    // your function here
}

Swift 3

DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(0.1)) {
    // your function here
}

Swift 2

let dispatchTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(0.1 * Double(NSEC_PER_SEC))) 
dispatch_after(dispatchTime, dispatch_get_main_queue(), { 
    // your function here 
})

Add a new line to a text file in MS-DOS

echo "text to echo" > file.txt

How to name Dockerfiles

I think you should have a directory per container with a Dockerfile (no extension) in it. For example:

  /db/Dockerfile
  /web/Dockerfile
  /api/Dockerfile

When you build just use the directory name, Docker will find the Dockerfile. e.g:

docker build -f ./db .

How do I make JavaScript beep?

The top answer was correct at the time but is now wrong; you can do it in pure javascript. But the one answer using javascript doesn't work any more, and the other answers are pretty limited or don't use pure javascript.

I made my own solution that works well and lets you control the volume, frequency, and wavetype.

//if you have another AudioContext class use that one, as some browsers have a limit
var audioCtx = new (window.AudioContext || window.webkitAudioContext || window.audioContext);

//All arguments are optional:

//duration of the tone in milliseconds. Default is 500
//frequency of the tone in hertz. default is 440
//volume of the tone. Default is 1, off is 0.
//type of tone. Possible values are sine, square, sawtooth, triangle, and custom. Default is sine.
//callback to use on end of tone
function beep(duration, frequency, volume, type, callback) {
    var oscillator = audioCtx.createOscillator();
    var gainNode = audioCtx.createGain();

    oscillator.connect(gainNode);
    gainNode.connect(audioCtx.destination);

    if (volume){gainNode.gain.value = volume;}
    if (frequency){oscillator.frequency.value = frequency;}
    if (type){oscillator.type = type;}
    if (callback){oscillator.onended = callback;}

    oscillator.start(audioCtx.currentTime);
    oscillator.stop(audioCtx.currentTime + ((duration || 500) / 1000));
};

Someone suggested I edit this to note it only works on some browsers. However Audiocontext seems to be supported on all modern browsers, as far as I can tell. It isn't supported on IE, but that has been discontinued by Microsoft. If you have any issues with this on a specific browser please report it.

ASP.NET MVC controller actions that return JSON or partial html

You may want to take a look at this very helpful article which covers this very nicely!

Just thought it might help people searching for a good solution to this problem.

http://weblogs.asp.net/rashid/archive/2009/04/15/adaptive-rendering-in-asp-net-mvc.aspx

Enabling/Disabling Microsoft Virtual WiFi Miniport

You go to your "device manager", find your "network adapters", then should find the virtual wifi adapter, then right click it and enable it. After that, you start your cmd with admin privileges, then try:

netsh wlan start hostednetwork

Sending websocket ping/pong frame from browser

There is no Javascript API to send ping frames or receive pong frames. This is either supported by your browser, or not. There is also no API to enable, configure or detect whether the browser supports and is using ping/pong frames. There was discussion about creating a Javascript ping/pong API for this. There is a possibility that pings may be configurable/detectable in the future, but it is unlikely that Javascript will be able to directly send and receive ping/pong frames.

However, if you control both the client and server code, then you can easily add ping/pong support at a higher level. You will need some sort of message type header/metadata in your message if you don't have that already, but that's pretty simple. Unless you are planning on sending pings hundreds of times per second or have thousands of simultaneous clients, the overhead is going to be pretty minimal to do it yourself.

Difference between array_map, array_walk and array_filter

Changing Values:
- array_map cannot change the values inside input array(s) while array_walk can; in particular, array_map never changes its arguments.
Array Keys Access:
- array_map cannot operate with the array keys, array_walk can.
Return Value:
- array_map returns a new array, array_walk only returns true. Hence, if you don't want to create an array as a result of traversing one array, you should use array_walk.
Iterating Multiple Arrays:
- array_map also can receive an arbitrary number of arrays and it can iterate over them in parallel, while array_walk operates only on one.
Passing Arbitrary Data to Callback:
- array_walk can receive an extra arbitrary parameter to pass to the callback. This mostly irrelevant since PHP 5.3 (when anonymous functions were introduced).
Length of Returned Array:
- The resulting array of array_map has the same length as that of the largest input array; array_walk does not return an array but at the same time it cannot alter the number of elements of original array; array_filter picks only a subset of the elements of the array according to a filtering function. It does preserve the keys.

Example:

<pre>
<?php

$origarray1 = array(2.4, 2.6, 3.5);
$origarray2 = array(2.4, 2.6, 3.5);

print_r(array_map('floor', $origarray1)); // $origarray1 stays the same

// changes $origarray2
array_walk($origarray2, function (&$v, $k) { $v = floor($v); }); 
print_r($origarray2);

// this is a more proper use of array_walk
array_walk($origarray1, function ($v, $k) { echo "$k => $v", "\n"; });

// array_map accepts several arrays
print_r(
    array_map(function ($a, $b) { return $a * $b; }, $origarray1, $origarray2)
);

// select only elements that are > 2.5
print_r(
    array_filter($origarray1, function ($a) { return $a > 2.5; })
);

?>
</pre>

Result:

Array
(
    [0] => 2
    [1] => 2
    [2] => 3
)
Array
(
    [0] => 2
    [1] => 2
    [2] => 3
)
0 => 2.4
1 => 2.6
2 => 3.5
Array
(
    [0] => 4.8
    [1] => 5.2
    [2] => 10.5
)
Array
(
    [1] => 2.6
    [2] => 3.5
)

href="tel:" and mobile numbers

When dialing a number within the country you are in, you still need to dial the national trunk number before the rest of the number. For example, in Australia one would dial:

   0 - trunk prefix
   2 - Area code for New South Wales
6555 - STD code for a specific telephone exchange
1234 - Telephone Exchange specific extension.

For a mobile phone this becomes

   0 -      trunk prefix
   4 -      Area code for a mobile telephone
1234 5678 - Mobile telephone number

Now, when I want to dial via the international trunk, you need to drop the trunk prefix and replace it with the international dialing prefix

   + -      Short hand for the country trunk number
  61 -      Country code for Australia
   4 -      Area code for a mobile telephone
1234 5678 - Mobile telephone number

This is why you often find that the first digit of a telephone number is dropped when dialling internationally, even when using international prefixing to dial within the same country.

So as per the trunk prefix for Germany drop the 0 and add the +49 for Germany's international calling code (for example) giving:

_x000D_

<a href="tel:+496170961709" class="Blondie">_x000D_
    Call me, call me any, anytime_x000D_
      <b>Call me (call me) I'll arrive</b>_x000D_
        When you're ready we can share the wine!_x000D_
</a>

_x000D_

SELECT with a Replace()

You have to repeat your expression everywhere you want to use it:

SELECT Replace(Postcode, ' ', '') AS P
FROM Contacts
WHERE Replace(Postcode, ' ', '') LIKE 'NW101%'

or you can make it a subquery

select P
from (
SELECT Replace(Postcode, ' ', '') AS P
FROM Contacts
) t
WHERE P LIKE 'NW101%'

getOutputStream() has already been called for this response

Here is what worked for me in similar case.

After you finish writing into the Servlet OutputStream just call response.sendRedirect("yourPage.jsp");. That would cause initiation of a new request from the browser, therefore avoid writing into the same output stream.

Convert HTML5 into standalone Android App

You can use https://appery.io/ It is the same phonegap but in very convinient wrapper

Get the date of next monday, tuesday, etc

See strtotime()

strtotime('next tuesday');

You could probably find out if you have gone past that day by looking at the week number:

$nextTuesday = strtotime('next tuesday');
$weekNo = date('W');
$weekNoNextTuesday = date('W', $nextTuesday);

if ($weekNoNextTuesday != $weekNo) {
    //past tuesday
}

PowerShell: Create Local User Account

Import-Csv C:\test.csv |
Foreach-Object {
  NET USER    $ _.username   $ _.password /ADD
  NET LOCALGROUP "group" $_.username  /ADD
}

edit csv as username,password and change "group" for your groupname

:) worked on 2012 R2

How do I disable orientation change on Android?

In the AndroidManifest.xml file, for each activity you want to lock add the last screenOrientation line:

android:label="@string/app_name"
android:name=".Login"
android:screenOrientation="portrait" >

Or android:screenOrientation="landscape".

What does .shape[] do in "for i in range(Y.shape[0])"?

shape is a tuple that gives you an indication of the number of dimensions in the array. So in your case, since the index value of Y.shape[0] is 0, your are working along the first dimension of your array.

From http://www.scipy.org/Tentative_NumPy_Tutorial#head-62ef2d3c0a5b4b7d6fdc48e4a60fe48b1ffe5006

 An array has a shape given by the number of elements along each axis:
 >>> a = floor(10*random.random((3,4)))

 >>> a
 array([[ 7.,  5.,  9.,  3.],
        [ 7.,  2.,  7.,  8.],
        [ 6.,  8.,  3.,  2.]])

 >>> a.shape
 (3, 4)

and http://www.scipy.org/Numpy_Example_List#shape has some more examples.

Calculate difference between 2 date / times in Oracle SQL

select (floor(((DATE2-DATE1)*24*60*60)/3600)|| ' : ' ||floor((((DATE2-DATE1)*24*60*60) -floor(((DATE2-DATE1)*24*60*60)/3600)*3600)/60)|| '  ' ) as time_difference from TABLE1

How to find an available port?

If you pass 0 as the port number to the constructor of ServerSocket, It will allocate a port for you.

IOException: read failed, socket might closed - Bluetooth on Android 4.3

On newer versions of Android, I was receiving this error because the adapter was still discovering when I attempted to connect to the socket. Even though I called the cancelDiscovery method on the Bluetooth adapter, I had to wait until the callback to the BroadcastReceiver's onReceive() method was called with the action BluetoothAdapter.ACTION_DISCOVERY_FINISHED.

Once I waited for the adapter to stop discovery, then the connect call on the socket succeeded.

Flask SQLAlchemy query, specify column names

session.query().with_entities(SomeModel.col1)

is the same as

session.query(SomeModel.col1)

for alias, we can use .label()

session.query(SomeModel.col1.label('some alias name'))

Binding Listbox to List<object> in WinForms

For a UWP app:

XAML

<ListBox x:Name="List" DisplayMemberPath="Source" ItemsSource="{x:Bind Results}"/>

public ObservableCollection<Type> Results

How Can I Truncate A String In jQuery?

with prototype and without space :

 String.prototype.trimToLength = function (trimLenght) {
    return this.length > trimLenght ? this.substring(0, trimLenght - 3) + '...' : this
};

Is background-color:none valid CSS?

So, I would like to explain the scenario where I had to make use of this solution. Basically, I wanted to undo the background-color attribute set by another CSS. The expected end result was to make it look as though the original CSS had never applied the background-color attribute . Setting background-color:transparent; made that effective.

go to character in vim

vim +21490go script.py

From the command line will open the file and take you to position 21490 in the buffer.

Triggering it from the command line like this allows you to automate a script to parse the exception message and open the file to the problem position.

Excerpt from man vim:

+{command}

-c {command}
{command} will be executed after the first file has been read. {command} is interpreted as an Ex command. If the {command} contains spaces it must be enclosed in double quotes (this depends on the shell that is used).

How to keep the local file or the remote file during merge using Git and the command line?

For the line-end thingie, refer to man git-merge:

--ignore-space-change 
--ignore-all-space 
--ignore-space-at-eol

Be sure to add autocrlf = false and/or safecrlf = false to the windows clone (.git/config)

Using git mergetool

If you configure a mergetool like this:

git config mergetool.cp.cmd '/bin/cp -v "$REMOTE" "$MERGED"'
git config mergetool.cp.trustExitCode true

Then a simple

git mergetool --tool=cp
git mergetool --tool=cp -- paths/to/files.txt
git mergetool --tool=cp -y -- paths/to/files.txt # without prompting

Will do the job

Using simple git commands

In other cases, I assume

git checkout HEAD -- path/to/myfile.txt

should do the trick

Edit to do the reverse (because you screwed up):

git checkout remote/branch_to_merge -- path/to/myfile.txt

Mocking Logger and LoggerFactory with PowerMock and Mockito

EDIT 2020-09-21: Since 3.4.0, Mockito supports mocking static methods, API is still incubating and is likely to change, in particular around stubbing and verification. It requires the mockito-inline artifact. And you don't need to prepare the test or use any specific runner. All you need to do is :

@Test
public void name() {
    try (MockedStatic<LoggerFactory> integerMock = mockStatic(LoggerFactory.class)) {
        final Logger logger = mock(Logger.class);
        integerMock.when(() -> LoggerFactory.getLogger(any(Class.class))).thenReturn(logger);
        new Controller().log();
        verify(logger).warn(any());
    }
}

The two inportant aspect in this code, is that you need to scope when the static mock applies, i.e. within this try block. And you need to call the stubbing and verification api from the MockedStatic object.

@Mick, try to prepare the owner of the static field too, eg :

@PrepareForTest({GoodbyeController.class, LoggerFactory.class})

EDIT1 : I just crafted a small example. First the controller :

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Controller {
    Logger logger = LoggerFactory.getLogger(Controller.class);

    public void log() { logger.warn("yup"); }
}

Then the test :

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.verify;
import static org.powermock.api.mockito.PowerMockito.mock;
import static org.powermock.api.mockito.PowerMockito.mockStatic;
import static org.powermock.api.mockito.PowerMockito.when;

@RunWith(PowerMockRunner.class)
@PrepareForTest({Controller.class, LoggerFactory.class})
public class ControllerTest {

    @Test
    public void name() throws Exception {
        mockStatic(LoggerFactory.class);
        Logger logger = mock(Logger.class);
        when(LoggerFactory.getLogger(any(Class.class))).thenReturn(logger);
        
        new Controller().log();
        
        verify(logger).warn(anyString());
    }
}

Note the imports ! Noteworthy libs in the classpath : Mockito, PowerMock, JUnit, logback-core, logback-clasic, slf4j

EDIT2 : As it seems to be a popular question, I'd like to point out that if these log messages are that important and require to be tested, i.e. they are feature / business part of the system then introducing a real dependency that make clear theses logs are features would be a so much better in the whole system design, instead of relying on static code of a standard and technical classes of a logger.

For this matter I would recommend to craft something like= a Reporter class with methods such as reportIncorrectUseOfYAndZForActionX or reportProgressStartedForActionX. This would have the benefit of making the feature visible for anyone reading the code. But it will also help to achieve tests, change the implementations details of this particular feature.

Hence you wouldn't need static mocking tools like PowerMock. In my opinion static code can be fine, but as soon as the test demands to verify or to mock static behavior it is necessary to refactor and introduce clear dependencies.

Comparing strings in C# with OR in an if statement

Since you want to check whether textboxes contains any value or not your code should do the job. You should be more specific about the error you are having. You can also do:

if(textBox1.Text == string.Empty || textBox2.Text == string.Empty)
   {
    MessageBox.Show("You must enter a value into both boxes");
   }

EDIT 2: based on @JonSkeet comments:

Usage of string.Compare is not required as per OP's original unedited post. String.Equals should do the job if one wants to compare strings, and StringComparison may be used to ignore case for the comparison. string.Compare should be used for order comparison. Originally the question contain this comparison,

string testString = "This is a test";
string testString2 = "This is not a test";

if (testString == testString2)
{
    //do some stuff;
}

the if statement can be replaced with

if(testString.Equals(testString2))

or following to ignore case.

if(testString.Equals(testString2,StringComparison.InvariantCultureIgnoreCase))

What is difference between XML Schema and DTD?

DTD predates XML and is therefore not valid XML itself. That's probably the biggest reason for XSD's invention.

How can I calculate the number of years between two dates?

for(var y=birthyear; y <= thisyear; y++){ 

if( (y % 4 == 0 && y % 100 == 0) || y % 400 == 0 ) { 
 days = days-366;
 number_of_long_years++; 
} else {
    days=days-365;
}

year++;

}

can you try this way??

Reverse Contents in Array

The line

arr[i] = temp;

is wrong. (On the first iteration of your loop it sets arr[i] to an undefined value; further iterations set it to an incorrect value.) If you remove this line, your array should be reversed correctly.

After that, you should move the code which prints the reversed array into a new loop which iterates over the whole list. Your current code only prints the first count/2 elements.

int temp, i;
for (i = 0; i < count/2; ++i) {
    temp = arr[count-i-1];
    arr[count-i-1] = arr[i];
    arr[i] = temp;
}
for (i = 0; i < count; ++i) {
    cout << arr[i] << " ";
}

How to write the code for the back button?

<input type="submit" <a href="#" onclick="history.back();">"Back"</a>

Is invalid HTML due to the unclosed input element.

<a href="#" onclick="history.back(1);">"Back"</a>

is enough

Remove spaces from std::string in C++

You can use this solution for removing a char:

#include <algorithm>
#include <string>
using namespace std;

str.erase(remove(str.begin(), str.end(), char_to_remove), str.end());

Generating random numbers with normal distribution in Excel

As @osknows said in a comment above (rather than an answer which is why I am adding this), the Analysis Pack includes Random Number Generation functions (e.g. NORM.DIST, NORM.INV) to generate a set of numbers. A good summary link is at http://www.bettersolutions.com/excel/EUN147/YI231420881.htm.

How do I connect to my existing Git repository using Visual Studio Code?

Open Visual Studio Code terminal (Ctrl + `)

Write the Git clone command. For example,

git clone https://github.com/angular/angular-phonecat.git

Open the folder you have just cloned (menu File → Open Folder)

How to add manifest permission to an application?

Assuming you do not have permissions set from your LogCat error description, here is my contents for my AndroidManifest.xml file that has access to the internet:

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

Other than that, you should be fine to download a file from the internet.

How to deal with bad_alloc in C++?

You can catch it like any other exception:

try {
  foo();
}
catch (const std::bad_alloc&) {
  return -1;
}

Quite what you can usefully do from this point is up to you, but it's definitely feasible technically.

In general you cannot, and should not try, to respond to this error. bad_alloc indicates that a resource cannot be allocated because not enough memory is available. In most scenarios your program cannot hope to cope with that, and terminating soon is the only meaningful behaviour.

Worse, modern operating systems often over-allocate: on such systems, malloc and new can return a valid pointer even if there is not enough free memory left – std::bad_alloc will never be thrown, or is at least not a reliable sign of memory exhaustion. Instead, attempts to access the allocated memory will then result in a segmentation fault, which is not catchable (you can handle the segmentation fault signal, but you cannot resume the program afterwards).

The only thing you could do when catching std::bad_alloc is to perhaps log the error, and try to ensure a safe program termination by freeing outstanding resources (but this is done automatically in the normal course of stack unwinding after the error gets thrown if the program uses RAII appropriately).

In certain cases, the program may attempt to free some memory and try again, or use secondary memory (= disk) instead of RAM but these opportunities only exist in very specific scenarios with strict conditions:

The application must ensure that it runs on a system that does not overcommit memory, i.e. it signals failure upon allocation rather than later.
The application must be able to free memory immediately, without any further accidental allocations in the meantime.

It’s exceedingly rare that applications have control over point 1 — userspace applications never do, it’s a system-wide setting that requires root permissions to change.¹

OK, so let’s assume you’ve fixed point 1. What you can now do is for instance use a LRU cache for some of your data (probably some particularly large business objects that can be regenerated or reloaded on demand). Next, you need to put the actual logic that may fail into a function that supports retry — in other words, if it gets aborted, you can just relaunch it:

lru_cache<widget> widget_cache;

double perform_operation(int widget_id) {
    std::optional<widget> maybe_widget = widget_cache.find_by_id(widget_id);
    if (not maybe_widget) {
        maybe_widget = widget_cache.store(widget_id, load_widget_from_disk(widget_id));
    }
    return maybe_widget->frobnicate();
}

…

for (int num_attempts = 0; num_attempts < MAX_NUM_ATTEMPTS; ++num_attempts) {
    try {
        return perform_operation(widget_id);
    } catch (std::bad_alloc const&) {
        if (widget_cache.empty()) throw; // memory error elsewhere.
        widget_cache.remove_oldest();
    }
}

// Handle too many failed attempts here.

But even here, using std::set_new_handler instead of handling std::bad_alloc provides the same benefit and would be much simpler.

¹ If you’re creating an application that does control point 1, and you’re reading this answer, please shoot me an email, I’m genuinely curious about your circumstances.

What is the C++ Standard specified behavior of `new` in c++?

The usual notion is that if new operator cannot allocate dynamic memory of the requested size, then it should throw an exception of type std::bad_alloc.
However, something more happens even before a bad_alloc exception is thrown:

C++03 Section 3.7.4.1.3: says

An allocation function that fails to allocate storage can invoke the currently installed new_handler(18.4.2.2), if any. [Note: A program-supplied allocation function can obtain the address of the currently installed new_handler using the set_new_handler function (18.4.2.3).] If an allocation function declared with an empty exception-specification (15.4), throw(), fails to allocate storage, it shall return a null pointer. Any other allocation function that fails to allocate storage shall only indicate failure by throw-ing an exception of class std::bad_alloc (18.4.2.1) or a class derived from std::bad_alloc.

Consider the following code sample:

#include <iostream>
#include <cstdlib>

// function to call if operator new can't allocate enough memory or error arises
void outOfMemHandler()
{
    std::cerr << "Unable to satisfy request for memory\n";

    std::abort();
}

int main()
{
    //set the new_handler
    std::set_new_handler(outOfMemHandler);

    //Request huge memory size, that will cause ::operator new to fail
    int *pBigDataArray = new int[100000000L];

    return 0;
}

In the above example, operator new (most likely) will be unable to allocate space for 100,000,000 integers, and the function outOfMemHandler() will be called, and the program will abort after issuing an error message.

As seen here the default behavior of new operator when unable to fulfill a memory request, is to call the new-handler function repeatedly until it can find enough memory or there is no more new handlers. In the above example, unless we call std::abort(), outOfMemHandler() would be called repeatedly. Therefore, the handler should either ensure that the next allocation succeeds, or register another handler, or register no handler, or not return (i.e. terminate the program). If there is no new handler and the allocation fails, the operator will throw an exception.

What is the `new_handler` and `set_new_handler`?

new_handler is a typedef for a pointer to a function that takes and returns nothing, and set_new_handler is a function that takes and returns a new_handler.

Something like:

typedef void (*new_handler)();
new_handler set_new_handler(new_handler p) throw();

set_new_handler's parameter is a pointer to the function operator new should call if it can't allocate the requested memory. Its return value is a pointer to the previously registered handler function, or null if there was no previous handler.

How to handle out of memory conditions in C++?

Given the behavior of newa well designed user program should handle out of memory conditions by providing a proper new_handlerwhich does one of the following:

Make more memory available: This may allow the next memory allocation attempt inside operator new's loop to succeed. One way to implement this is to allocate a large block of memory at program start-up, then release it for use in the program the first time the new-handler is invoked.

Install a different new-handler: If the current new-handler can't make any more memory available, and of there is another new-handler that can, then the current new-handler can install the other new-handler in its place (by calling set_new_handler). The next time operator new calls the new-handler function, it will get the one most recently installed.

(A variation on this theme is for a new-handler to modify its own behavior, so the next time it's invoked, it does something different. One way to achieve this is to have the new-handler modify static, namespace-specific, or global data that affects the new-handler's behavior.)

Uninstall the new-handler: This is done by passing a null pointer to set_new_handler. With no new-handler installed, operator new will throw an exception ((convertible to) std::bad_alloc) when memory allocation is unsuccessful.

Throw an exception convertible to std::bad_alloc. Such exceptions are not be caught by operator new, but will propagate to the site originating the request for memory.

Not return: By calling abort or exit.

What does "./" (dot slash) refer to in terms of an HTML file path location?

In reference to the quick reference list, specifically you can use the following :

\.\ Root Directory + Current directory (Drive Letter)

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

Response you are getting is in object form i.e.

{ 
  "dstOffset" : 3600, 
  "rawOffset" : 36000, 
  "status" : "OK", 
  "timeZoneId" : "Australia/Hobart", 
  "timeZoneName" : "Australian Eastern Daylight Time" 
}

Replace below line of code :

List<Post> postsList = Arrays.asList(gson.fromJson(reader,Post.class))

with

Post post = gson.fromJson(reader, Post.class);

Inserting Image Into BLOB Oracle 10g

You cannot access a local directory from pl/sql. If you use bfile, you will setup a directory (create directory) on the server where Oracle is running where you will need to put your images.

If you want to insert a handful of images from your local machine, you'll need a client side app to do this. You can write your own, but I typically use Toad for this. In schema browser, click onto the table. Click the data tab, and hit + sign to add a row. Double click the BLOB column, and a wizard opens. The far left icon will load an image into the blob:

enter image description here

SQL Developer has a similar feature. See the "Load" link below:

enter image description here

If you need to pull images over the wire, you can do it using pl/sql, but its not straight forward. First, you'll need to setup ACL list access (for security reasons) to allow a user to pull over the wire. See this article for more on ACL setup.

Assuming ACL is complete, you'd pull the image like this:

declare
    l_url varchar2(4000) := 'http://www.oracleimg.com/us/assets/12_c_navbnr.jpg';
    l_http_request   UTL_HTTP.req;
    l_http_response  UTL_HTTP.resp;
    l_raw RAW(2000);
    l_blob BLOB;
begin
   -- Important: setup ACL access list first!

    DBMS_LOB.createtemporary(l_blob, FALSE);

    l_http_request  := UTL_HTTP.begin_request(l_url);
    l_http_response := UTL_HTTP.get_response(l_http_request);

  -- Copy the response into the BLOB.
  BEGIN
    LOOP
      UTL_HTTP.read_raw(l_http_response, l_raw, 2000);
      DBMS_LOB.writeappend (l_blob, UTL_RAW.length(l_raw), l_raw);
    END LOOP;
  EXCEPTION
    WHEN UTL_HTTP.end_of_body THEN
      UTL_HTTP.end_response(l_http_response);
  END;

  insert into my_pics (pic_id, pic) values (102, l_blob);
  commit;

  DBMS_LOB.freetemporary(l_blob); 
end;

Hope that helps.

Error CS2001: Source file '.cs' could not be found

I open the project,.csproj, using a notepad and delete that missing file reference.

Resync git repo with new .gitignore file

I might misunderstand, but are you trying to delete files newly ignored or do you want to ignore new modifications to these files ? In this case, the thing is working.

If you want to delete ignored files previously commited, then use

git rm –cached `git ls-files -i –exclude-standard`
git commit -m 'clean up'

What is Dependency Injection?

I know there are already many answers, but I found this very helpful: http://tutorials.jenkov.com/dependency-injection/index.html

No Dependency:

public class MyDao {

  protected DataSource dataSource = new DataSourceImpl(
    "driver", "url", "user", "password");

  //data access methods...
  public Person readPerson(int primaryKey) {...}     
}

Dependency:

public class MyDao {

  protected DataSource dataSource = null;

  public MyDao(String driver, String url, String user, String password) {
    this.dataSource = new DataSourceImpl(driver, url, user, password);
  }

  //data access methods...
  public Person readPerson(int primaryKey) {...}
}

Notice how the DataSourceImpl instantiation is moved into a constructor. The constructor takes four parameters which are the four values needed by the DataSourceImpl. Though the MyDao class still depends on these four values, it no longer satisfies these dependencies itself. They are provided by whatever class creating a MyDao instance.

Strip / trim all strings of a dataframe

You can try:

df[0] = df[0].str.strip()

or more specifically for all string columns

non_numeric_columns = list(set(df.columns)-set(df._get_numeric_data().columns))
df[non_numeric_columns] = df[non_numeric_columns].apply(lambda x : str(x).strip())

Creating a ZIP archive in memory using System.IO.Compression

Just in case, if anyone wants to save a dynamic zip file through SaveFileDialog.

        var logFileName = "zip_filename.zip";
        appLogSaver.FileName = logFileName;
        appLogSaver.Filter = "LogFiles|*.zip";
        appLogSaver.DefaultExt = "zip";
        DialogResult resDialog = appLogSaver.ShowDialog();

        if (resDialog.ToString() == "OK")
        {
            System.IO.FileStream fs = (System.IO.FileStream)appLogSaver.OpenFile();

            using (var memoryStream = new MemoryStream())
            {
                using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
                {
                    var demoFile = archive.CreateEntry("foo.txt");
                    using (var entryStream = demoFile.Open())
                    {
                        using (var streamWriter = new StreamWriter(entryStream))
                        {
                            //read your existing file and put the content here 
                            streamWriter.Write("Bar!");
                        }
                    }

                    var demoFile2 = archive.CreateEntry("foo2.txt");
                    using (var entryStream = demoFile2.Open())
                    {
                        using (var streamWriter = new StreamWriter(entryStream))
                        {
                            streamWriter.Write("Bar2!");
                        }
                    }
                }

                memoryStream.Seek(0, SeekOrigin.Begin);
                memoryStream.CopyTo(fs);
            }
            fs.Close();
        }

Pull is not possible because you have unmerged files, git stash doesn't work. Don't want to commit

You can use git checkout <file> to check out the committed version of the file (thus discarding your changes), or git reset --hard HEAD to throw away any uncommitted changes for all files.

Correct way to push into state array

Using es6 it can be done like this:

this.setState({ myArray: [...this.state.myArray, 'new value'] }) //simple value
this.setState({ myArray: [...this.state.myArray, ...[1,2,3] ] }) //another array

Spread syntax

Unix command to find lines common in two files

The command you are seeking is comm. eg:-

comm -12 1.sorted.txt 2.sorted.txt

Here:

-1 : suppress column 1 (lines unique to 1.sorted.txt)

-2 : suppress column 2 (lines unique to 2.sorted.txt)

How to display JavaScript variables in a HTML page without document.write

innerHTML is fine and still valid. Use it all the time on projects big and small. I just flipped to an open tab in my IDE and there was one right there.

 document.getElementById("data-progress").innerHTML = "<img src='../images/loading.gif'/>";

Not much has changed in js + dom manipulation since 2005, other than the addition of more libraries. You can easily set other properties such as

   uploadElement.style.width = "100%";

Python ImportError: No module named wx

You may check if you have the directory where are the packages of Python (in my machine, this dir is C:\Python27\lib\site-packages) in the Path variable on Windows. If Python's path environment variable does not have this directory, you will not find the packages.

Including non-Python files with setup.py

In setup.py under setup( :

setup(
   name = 'foo library'
   ...
  package_data={
   'foolibrary.folderA': ['*'],     # All files from folder A
   'foolibrary.folderB': ['*.txt']  #All text files from folder B
   },

Leader Not Available Kafka in Console Producer

I have been witnessing this same issue in the last 2 weeks while working with Kafka and have been reading this Stackoverflow's post ever since.

After 2 weeks of analysis i have deduced that in my case this happens when trying to produce messages to a topic that doesn't exist.

The outcome in my case is that Kafka sends an error message back but creates, at the same time, the topic that did not exist before. So if I try to produce any message again to that topic after this event, the error will not appear anymore as the topic as been created.

PLEASE NOTE: It could be that my particular Kafka installation was configured to automatically create the topic when the same does not exist; that should explain why in my case I can see the issue only once for every topic after resetting the topics: your configuration might be different and in that case you would keep receiving the same error over and over.

Regards,

Luca Tampellini

What is the difference between .NET Core and .NET Standard Class Library project types?

A .NET Core Class Library is built upon the .NET Standard. If you want to implement a library that is portable to the .NET Framework, .NET Core and Xamarin, choose a .NET Standard Library

.NET Core will ultimately implement .NET Standard 2 (as will Xamarin and .NET Framework)

.NET Core, Xamarin and .NET Framework can, therefore, be identified as flavours of .NET Standard

To future-proof your applications for code sharing and reuse, you would rather implement .NET Standard libraries.

Microsoft also recommends that you use .NET Standard instead of Portable Class Libraries.

To quote MSDN as an authoritative source, .NET Standard is intended to be One Library to Rule Them All. As pictures are worth a thousand words, the following will make things very clear:

1. Your current application scenario (fragmented)

Like most of us, you are probably in the situation below: (.NET Framework, Xamarin and now .NET Core flavoured applications)

2. What the .NET Standard Library will enable for you (cross-framework compatibility)

Implementing a .NET Standard Library allows code sharing across all these different flavours:

For the impatient:

.NET Standard solves the code sharing problem for .NET developers across all platforms by bringing all the APIs that you expect and love across the environments that you need: desktop applications, mobile apps & games, and cloud services:
.NET Standard is a set of APIs that all .NET platforms have to implement. This unifies the .NET platforms and prevents future fragmentation.
.NET Standard 2.0 will be implemented by .NET Framework, .NET Core, and Xamarin. For .NET Core, this will add many of the existing APIs that have been requested.
.NET Standard 2.0 includes a compatibility shim for .NET Framework binaries, significantly increasing the set of libraries that you can reference from your .NET Standard libraries.
.NET Standard will replace Portable Class Libraries (PCLs) as the tooling story for building multi-platform .NET libraries.

For a table to help understand what the highest version of .NET Standard that you can target, based on which .NET platforms you intend to run on, head over here.

Sources: MSDN: Introducing .NET Standard

What is the opposite of :hover (on mouse leave)?

Just add a transition and the name of the animation on the class inicial, in your case, ul li a, just add a "transition" property and that is all you need

_x000D_

ul li {_x000D_
    display: inline;_x000D_
    margin-left: 20px;_x000D_
}_x000D_
_x000D_
ul li a {_x000D_
    color: #999;_x000D_
    transition: 1s;_x000D_
    -webkit-animation: item-hover-off 1s;_x000D_
    -moz-animation: item-hover-off 1s;_x000D_
    animation: item-hover-off 1s;_x000D_
}_x000D_
_x000D_
ul li a:hover {_x000D_
    color: black;_x000D_
    cursor: pointer;_x000D_
    -webkit-animation: item-hover 1s;_x000D_
    -moz-animation: item-hover 1s;_x000D_
    animation: item-hover 1s;_x000D_
}_x000D_
_x000D_
@keyframes item-hover {_x000D_
    from {_x000D_
      color: #999;_x000D_
      }_x000D_
    to {_x000D_
      color: black;_x000D_
      }_x000D_
}_x000D_
    _x000D_
@-moz-keyframes item-hover {_x000D_
    from {_x000D_
        color: #999;_x000D_
      }_x000D_
    to {_x000D_
        color: black;_x000D_
      }_x000D_
}_x000D_
    _x000D_
@-webkit-keyframes item-hover {_x000D_
    from {_x000D_
        color: #999;_x000D_
      }_x000D_
    to {_x000D_
        color: black;_x000D_
      }_x000D_
}_x000D_
_x000D_
@keyframes item-hover-off {_x000D_
    from {_x000D_
      color: black;_x000D_
      }_x000D_
    to {_x000D_
      color: #999;_x000D_
      }_x000D_
}_x000D_
    _x000D_
@-moz-keyframes item-hover-off {_x000D_
    from {_x000D_
        color: black;_x000D_
      }_x000D_
    to {_x000D_
        color: #999;_x000D_
      }_x000D_
}_x000D_
    _x000D_
@-webkit-keyframes item-hover-off {_x000D_
    from {_x000D_
        color: black;_x000D_
      }_x000D_
    to {_x000D_
        color: #999;_x000D_
      }_x000D_
}

_x000D_

<ul>_x000D_
    <li><a>Home</a></li>_x000D_
    <li><a>About</a></li>_x000D_
    <li><a>Contacts</a></li>_x000D_
</ul>

_x000D_

What does "pending" mean for request in Chrome Developer Window?

I came across this issue when I was debugging a local web application. The issue turned out to be AVG Antivirus and Firewall restrictions. I had to allow an exception through the firewall to get rid of the "Pending" status.

Is it possible to use Java 8 for Android development?

Easy way

You can enable java 1.8 support for android project.

Open Project Structure
- Either by pressing Ctrl + Shift + Alt + S
- Or File > Project Structure
Update the Source Compatibility and Target Compatibility to 1.8 in the Project Structure dialog as shown (click File > Project Structure).

Or you can use gradle

 android {
   compileOptions {
       sourceCompatibility JavaVersion.VERSION_1_8
       targetCompatibility JavaVersion.VERSION_1_8
   }

Sync project. And that's it!

Note: Java 1.8 support can be enabled for Android Studio 3.0.0 or higher. See Documentation for further reading.

How to do logging in React Native?

Use console.log, console.warn etc.

As of React Native 0.29 you can simply run the following to see logs in the console:

$ react-native log-ios
$ react-native log-android

Free c# QR-Code generator

Take a look QRCoder - pure C# open source QR code generator. Can be used in three lines of code

QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(textBoxQRCode.Text, QRCodeGenerator.ECCLevel.Q);
pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic(20);

Unable to set variables in bash script

here's your amended script

#!/bin/bash    
folder="ABC" #no spaces between assignment    
useracct='test'    
day=$(date "+%d") # use $() to assign return value of date command to variable    
month=$(date "+%B")     
year=$(date "+%Y")    
folderToBeMoved="/users/$useracct/Documents/Archive/Primetime.eyetv"    
newfoldername="/Volumes/Media/Network/$folder/$month$day$year"    
ECHO "Network is $network" $network    
ECHO "day is $day"    
ECHO "Month is $month"    
ECHO "YEAR is $year"    
ECHO "source is $folderToBeMoved"    
ECHO "dest is $newfoldername"    

mkdir "$newfoldername"    
cp -R "$folderToBeMoved" "$newfoldername"
if [ -f "$newfoldername/Primetime.eyetv" ]; then # <-- put a space at square brackets and quote your variables.
 rm "$folderToBeMoved";
fi

WCF Service Client: The content type text/html; charset=utf-8 of the response message does not match the content type of the binding

As with many, in my situation I was also getting this because of an error. And sadly I could just read the CSS of the html error page.

The source of my problem was also a rewrite rule on the server. It was rewriting http to https.

Creating lowpass filter in SciPy - understanding methods and units

A few comments:

The Nyquist frequency is half the sampling rate.
You are working with regularly sampled data, so you want a digital filter, not an analog filter. This means you should not use analog=True in the call to butter, and you should use scipy.signal.freqz (not freqs) to generate the frequency response.
One goal of those short utility functions is to allow you to leave all your frequencies expressed in Hz. You shouldn't have to convert to rad/sec. As long as you express your frequencies with consistent units, the scaling in the utility functions takes care of the normalization for you.

Here's my modified version of your script, followed by the plot that it generates.

import numpy as np
from scipy.signal import butter, lfilter, freqz
import matplotlib.pyplot as plt


def butter_lowpass(cutoff, fs, order=5):
    nyq = 0.5 * fs
    normal_cutoff = cutoff / nyq
    b, a = butter(order, normal_cutoff, btype='low', analog=False)
    return b, a

def butter_lowpass_filter(data, cutoff, fs, order=5):
    b, a = butter_lowpass(cutoff, fs, order=order)
    y = lfilter(b, a, data)
    return y


# Filter requirements.
order = 6
fs = 30.0       # sample rate, Hz
cutoff = 3.667  # desired cutoff frequency of the filter, Hz

# Get the filter coefficients so we can check its frequency response.
b, a = butter_lowpass(cutoff, fs, order)

# Plot the frequency response.
w, h = freqz(b, a, worN=8000)
plt.subplot(2, 1, 1)
plt.plot(0.5*fs*w/np.pi, np.abs(h), 'b')
plt.plot(cutoff, 0.5*np.sqrt(2), 'ko')
plt.axvline(cutoff, color='k')
plt.xlim(0, 0.5*fs)
plt.title("Lowpass Filter Frequency Response")
plt.xlabel('Frequency [Hz]')
plt.grid()


# Demonstrate the use of the filter.
# First make some data to be filtered.
T = 5.0         # seconds
n = int(T * fs) # total number of samples
t = np.linspace(0, T, n, endpoint=False)
# "Noisy" data.  We want to recover the 1.2 Hz signal from this.
data = np.sin(1.2*2*np.pi*t) + 1.5*np.cos(9*2*np.pi*t) + 0.5*np.sin(12.0*2*np.pi*t)

# Filter the data, and plot both the original and filtered signals.
y = butter_lowpass_filter(data, cutoff, fs, order)

plt.subplot(2, 1, 2)
plt.plot(t, data, 'b-', label='data')
plt.plot(t, y, 'g-', linewidth=2, label='filtered data')
plt.xlabel('Time [sec]')
plt.grid()
plt.legend()

plt.subplots_adjust(hspace=0.35)
plt.show()

lowpass example

A simple algorithm for polygon intersection

I have no very simple solution, but here are the main steps for the real algorithm:

Do a custom double linked list for the polygon vertices and edges. Using std::list won't do because you must swap next and previous pointers/offsets yourself for a special operation on the nodes. This is the only way to have simple code, and this will give good performance.
Find the intersection points by comparing each pair of edges. Note that comparing each pair of edge will give O(N²) time, but improving the algorithm to O(N·logN) will be easy afterwards. For some pair of edges (say a?b and c?d), the intersection point is found by using the parameter (from 0 to 1) on edge a?b, which is given by t?=d0/(d0-d1), where d0 is (c-a)×(b-a) and d1 is (d-a)×(b-a). × is the 2D cross product such as p×q=p?·q?-p?·q?. After having found t?, finding the intersection point is using it as a linear interpolation parameter on segment a?b: P=a+t?(b-a)
Split each edge adding vertices (and nodes in your linked list) where the segments intersect.
Then you must cross the nodes at the intersection points. This is the operation for which you needed to do a custom double linked list. You must swap some pair of next pointers (and update the previous pointers accordingly).

Then you have the raw result of the polygon intersection resolving algorithm. Normally, you will want to select some region according to the winding number of each region. Search for polygon winding number for an explanation on this.

If you want to make a O(N·logN) algorithm out of this O(N²) one, you must do exactly the same thing except that you do it inside of a line sweep algorithm. Look for Bentley Ottman algorithm. The inner algorithm will be the same, with the only difference that you will have a reduced number of edges to compare, inside of the loop.

onKeyDown event not working on divs in React

The answer with

<div 
    className="player"
    onKeyDown={this.onKeyPressed}
    tabIndex={0}
>

works for me, please note that the tabIndex requires a number, not a string, so tabIndex="0" doesn't work.

Get the ID of a drawable in ImageView

A simple solution might be to just store the drawable id in a temporary variable. I'm not sure how practical this would be for your situation but it's definitely a quick fix.

Error in strings.xml file in Android

You may be able to use unicode equivalent both apostrophe and other characters which are not supported in xml string. Apostrophe's equivalent is "\u0027" .

Generics/templates in python?

Here's a variant of this answer that uses metaclasses to avoid the messy syntax, and use the typing-style List[int] syntax:

class template(type):
    def __new__(metacls, f):
        cls = type.__new__(metacls, f.__name__, (), {
            '_f': f,
            '__qualname__': f.__qualname__,
            '__module__': f.__module__,
            '__doc__': f.__doc__
        })
        cls.__instances = {}
        return cls

    def __init__(cls, f):  # only needed in 3.5 and below
        pass

    def __getitem__(cls, item):
        if not isinstance(item, tuple):
            item = (item,)
        try:
            return cls.__instances[item]
        except KeyError:
            cls.__instances[item] = c = cls._f(*item)
            item_repr = '[' + ', '.join(repr(i) for i in item) + ']'
            c.__name__ = cls.__name__ + item_repr
            c.__qualname__ = cls.__qualname__ + item_repr
            c.__template__ = cls
            return c

    def __subclasscheck__(cls, subclass):
        for c in subclass.mro():
            if getattr(c, '__template__', None) == cls:
                return True
        return False

    def __instancecheck__(cls, instance):
        return cls.__subclasscheck__(type(instance))

    def __repr__(cls):
        import inspect
        return '<template {!r}>'.format('{}.{}[{}]'.format(
            cls.__module__, cls.__qualname__, str(inspect.signature(cls._f))[1:-1]
        ))

With this new metaclass, we can rewrite the example in the answer I link to as:

@template
def List(member_type):
    class List(list):
        def append(self, member):
            if not isinstance(member, member_type):
                raise TypeError('Attempted to append a "{0}" to a "{1}" which only takes a "{2}"'.format(
                    type(member).__name__,
                    type(self).__name__,
                    member_type.__name__ 
                ))

                list.append(self, member)
    return List

l = List[int]()
l.append(1)  # ok
l.append("one")  # error

This approach has some nice benefits

print(List)  # <template '__main__.List[member_type]'>
print(List[int])  # <class '__main__.List[<class 'int'>, 10]'>
assert List[int] is List[int]
assert issubclass(List[int], List)  # True

Visual Studio: Relative Assembly References Paths

As mentioned before, you can manually edit your project's .csproj file in order to apply it manually.

I also noticed that Visual Studio 2013 attempts to apply a relative path to the reference hintpath, probably because of an attempt to make the project file more portable.

Node.js: How to send headers with form data using request module?

Just remember set method to POST in options. Here is my code

var options = {
    url: 'http://www.example.com',
    method: 'POST', // Don't forget this line
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'X-MicrosoftAjax': 'Delta=true', // blah, blah, blah...
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36',
    },
    form: {
        'key-1':'value-1',
        'key-2':'value-2',
        ...
    }
};

//console.log('options:', options);

// Create request to get data
request(options, (err, response, body) => {
    if (err) {
        //console.log(err);
    } else {
        console.log('body:', body);
    }
});

Why is exception.printStackTrace() considered bad practice?

In server applications the stacktrace blows up your stdout/stderr file. It may become larger and larger and is filled with useless data because usually you have no context and no timestamp and so on.

e.g. catalina.out when using tomcat as container

How can I select an element with multiple classes in jQuery?

For better performance you can use

$('div.a.b')

This will look only through the div elements instead of stepping through all the html elements that you have on your page.

How to add files/folders to .gitignore in IntelliJ IDEA?

I'm using intelliJ 15 community edition and I'm able to right click a file and select 'add to .gitignore'

ffmpeg - Converting MOV files to MP4

The command to just stream it to a new container (mp4) needed by some applications like Adobe Premiere Pro without encoding (fast) is:

ffmpeg -i input.mov -qscale 0 output.mp4

Alternative as mentioned in the comments, which re-encodes with best quaility (-qscale 0):

ffmpeg -i input.mov -q:v 0 output.mp4

font awesome icon in select option

If you want the caret down symbol, remove the "appearence: none" it implies to remove webkit and moz- as well from select in css.

How do I parse JSON into an int?

At first, you create a BufferedReader on a FileReader to the file.

Then, you create a new `JSONParser()´ object that parses the content read from the file.

You cast the parsed Object to a JSONObject and get the id field.

FileReader file=new FileReader("1.json");
BufferedReader write=new BufferedReader(file);
Object obj=new JSONParser().parse(write);
JSONObject jo = (JSONObject) obj;
long id=(long)jo.get("id");

What is the first character in the sort order used by Windows Explorer?

If you google for sort order windows explorer you will find out that Windows Explorer (since Windows XP) obviously uses the function StrCmpLogicalW in the sort order "by name". I did not find information about the treatment of the underscore character. I was amused by the following note in the documentation:

Behavior of this function, and therefore the results it returns, can change from release to release. ...

MySQL JOIN with LIMIT 1 on joined table

What about this?

SELECT c.id, c.title, (SELECT id from products AS p 
                            WHERE c.id = p.category_id 
                            ORDER BY ... 
                            LIMIT 1)
   FROM categories AS c;

LDAP server which is my base dn

The base dn is dc=example,dc=com.

I don't know about openca, but I will try this answer since you got very little traffic so far.

A base dn is the point from where a server will search for users. So I would try to simply use admin as a login name.

If openca behaves like most ldap aware applications, this is what is going to happen :

An ldap search for the user admin will be done by the server starting at the base dn (dc=example,dc=com).
When the user is found, the full dn (cn=admin,dc=example,dc=com) will be used to bind with the supplied password.
The ldap server will hash the password and compare with the stored hash value. If it matches, you're in.

Getting step 1 right is the hardest part, but mostly because we don't get to do it often. Things you have to look out for in your configuraiton file are :

The dn your application will use to bind to the ldap server. This happens at application startup, before any user comes to authenticate. You will have to supply a full dn, maybe something like cn=admin,dc=example,dc=com.
The authentication method. It is usually a "simple bind".
The user search filter. Look at the attribute named objectClass for your admin user. It will be either inetOrgPerson or user. There will be others like top, you can ignore them. In your openca configuration, there should be a string like (objectClass=inetOrgPerson). Whatever it is, make sure it matches your admin user's object Class. You can specify two object class with this search filter (|(objectClass=inetOrgPerson)(objectClass=user)).

Download an LDAP Browser, such as Apache's Directory Studio. Connect using your application's credentials, so you will see what your application sees.

How to go up a level in the src path of a URL in HTML?

Use ../:

background-image: url('../images/bg.png');

You can use that as often as you want, e.g. ../../images/ or even at different positions, e.g. ../images/../images/../images/ (same as ../images/ of course)

How to handle notification when app in background in Firebase

you want to work onMessageReceived(RemoteMessage remoteMessage) in background send only data part notification part this:

"data":    "image": "",    "message": "Firebase Push Message Using API",

"AnotherActivity": "True", "to" : "device id Or Device token"

By this onMessageRecivied is call background and foreground no need to handle notification using notification tray on your launcher activity. Handle data payload in using this:

  public void onMessageReceived(RemoteMessage remoteMessage)
    if (remoteMessage.getData().size() > 0) 
    Log.d(TAG, "Message data payload: " + remoteMessage.getData());

Android: making a fullscreen application

just do this in your manifest file in your activity tag

android:theme="@style/Theme.AppCompat.Light.NoActionBar"

What does Visual Studio mean by normalize inconsistent line endings?

What that usually means is that you have lines ending with something other than a carriage return/line feed pair. It often happens when you copy and paste from a web page into the code editor.

Normalizing the line endings is just making sure that all of the line ending characters are consistent. It prevents one line from ending in \r\n and another ending with \r or \n; the first is the Windows line end pair, while the others are typically used for Mac or Linux files.

Since you're developing in Visual Studio, you'll obviously want to choose "Windows" from the drop down. :-)

How to convert hex to ASCII characters in the Linux shell?

dc can convert between numeric bases:

$ echo 5a | (echo 16i; tr 'a-z' 'A-Z'; echo P) | dc
Z$

Disable browsers vertical and horizontal scrollbars

Try CSS

<body style="overflow: hidden">

SQL count rows in a table

select sum([rows])
from sys.partitions
where object_id=object_id('tablename')
 and index_id in (0,1)

is very fast but very rarely inaccurate.

String split on new line, tab and some number of spaces

Regex's aren't really the best tool for the job here. As others have said, using a combination of str.strip() and str.split() is the way to go. Here's a one liner to do it:

>>> data = '''\n\tName: John Smith
... \n\t  Home: Anytown USA
... \n\t    Phone: 555-555-555
... \n\t  Other Home: Somewhere Else
... \n\t Notes: Other data
... \n\tName: Jane Smith
... \n\t  Misc: Data with spaces'''
>>> {line.strip().split(': ')[0]:line.split(': ')[1] for line in data.splitlines() if line.strip() != ''}
{'Name': 'Jane Smith', 'Other Home': 'Somewhere Else', 'Notes': 'Other data', 'Misc': 'Data with spaces', 'Phone': '555-555-555', 'Home': 'Anytown USA'}

org.apache.http.conn.HttpHostConnectException: Connection to http://localhost refused in android

When you test with device you want to add your PC ip address.

in pc run in cmd Ipconfig

in ubuntu run terminal ifconfig

Then use "http://your_pc_ip_address:8080/register" insted of using "http://10.0.2.2:8080/register"

in my pc = 192.168.1.3

and also add internet permission to Manifest

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

Android : Capturing HTTP Requests with non-rooted android device

Set a https://mitmproxy.org/ as proxy on a same LAN

Open Source
Built in python 3
Installable via pip

When use ResponseEntity<T> and @RestController for Spring RESTful applications

According to official documentation: Creating REST Controllers with the @RestController annotation

@RestController is a stereotype annotation that combines @ResponseBody and @Controller. More than that, it gives more meaning to your Controller and also may carry additional semantics in future releases of the framework.

It seems that it's best to use @RestController for clarity, but you can also combine it with ResponseEntity for flexibility when needed (According to official tutorial and the code here and my question to confirm that).

For example:

@RestController
public class MyController {

    @GetMapping(path = "/test")
    @ResponseStatus(HttpStatus.OK)
    public User test() {
        User user = new User();
        user.setName("Name 1");

        return user;
    }

}

is the same as:

@RestController
public class MyController {

    @GetMapping(path = "/test")
    public ResponseEntity<User> test() {
        User user = new User();
        user.setName("Name 1");

        HttpHeaders responseHeaders = new HttpHeaders();
        // ...
        return new ResponseEntity<>(user, responseHeaders, HttpStatus.OK);
    }

}

This way, you can define ResponseEntity only when needed.

Update

You can use this:

    return ResponseEntity.ok().headers(responseHeaders).body(user);

Does Python have “private” variables in classes?

Python has limited support for private identifiers, through a feature that automatically prepends the class name to any identifiers starting with two underscores. This is transparent to the programmer, for the most part, but the net effect is that any variables named this way can be used as private variables.

See here for more on that.

In general, Python's implementation of object orientation is a bit primitive compared to other languages. But I enjoy this, actually. It's a very conceptually simple implementation and fits well with the dynamic style of the language.

Create Git branch with current changes

To add new changes to a new branch and push to remote:

git branch branch/name
git checkout branch/name
git push origin branch/name

Often times I forget to add the origin part to push and get confused why I don't see the new branch/commit in bitbucket

Call ASP.NET function from JavaScript?

I think blog post How to fetch & show SQL Server database data in ASP.NET page using Ajax (jQuery) will help you.

JavaScript Code

<script src="http://code.jquery.com/jquery-3.3.1.js" />
<script language="javascript" type="text/javascript">

    function GetCompanies() {
        $("#UpdatePanel").html("<div style='text-align:center; background-color:yellow; border:1px solid red; padding:3px; width:200px'>Please Wait...</div>");
        $.ajax({
            type: "POST",
            url: "Default.aspx/GetCompanies",
            data: "{}",
            dataType: "json",
            contentType: "application/json; charset=utf-8",
            success: OnSuccess,
            error: OnError
        });
    }

    function OnSuccess(data) {
        var TableContent = "<table border='0'>" +
                                "<tr>" +
                                    "<td>Rank</td>" +
                                    "<td>Company Name</td>" +
                                    "<td>Revenue</td>" +
                                    "<td>Industry</td>" +
                                "</tr>";
        for (var i = 0; i < data.d.length; i++) {
            TableContent += "<tr>" +
                                    "<td>"+ data.d[i].Rank +"</td>" +
                                    "<td>"+data.d[i].CompanyName+"</td>" +
                                    "<td>"+data.d[i].Revenue+"</td>" +
                                    "<td>"+data.d[i].Industry+"</td>" +
                                "</tr>";
        }
        TableContent += "</table>";

        $("#UpdatePanel").html(TableContent);
    }

    function OnError(data) {

    }
</script>

ASP.NET Server Side Function

[WebMethod]
[ScriptMethod(ResponseFormat= ResponseFormat.Json)]
public static List<TopCompany> GetCompanies()
{
    System.Threading.Thread.Sleep(5000);
    List<TopCompany> allCompany = new List<TopCompany>();
    using (MyDatabaseEntities dc = new MyDatabaseEntities())
    {
        allCompany = dc.TopCompanies.ToList();
    }
    return allCompany;
}

How to set Spring profile from system variable?

If you provide your JVM the Spring profile there should be no problems:

java -Dspring.profiles.active=development -jar yourApplication.jar

Also see Spring-Documentation:

http://docs.spring.io/spring-boot/docs/current/reference/html/howto-properties-and-configuration.html

69.5 Set the active Spring profiles

The Spring Environment has an API for this, but normally you would set a System property (spring.profiles.active) or an OS environment variable (SPRING_PROFILES_ACTIVE). E.g. launch your application with a -D argument (remember to put it before the main class or jar archive):

$ java -jar -Dspring.profiles.active=production demo-0.0.1-SNAPSHOT.jar

In Spring Boot you can also set the active profile in application.properties, e.g.

spring.profiles.active=production

A value set this way is replaced by the System property or environment variable setting, but not by the SpringApplicationBuilder.profiles() method. Thus the latter Java API can be used to augment the profiles without changing the defaults.

See Chapter 25, Profiles in the ‘Spring Boot features’ section for more information.

How can I convert a date into an integer?

Here what you can try:

var d = Date.parse("2016-07-19T20:23:01.804Z");
alert(d); //this is in milliseconds

Good font for code presentations?

I'm personally very fond of Inconsolata

Installing Bower on Ubuntu

First of all install nodejs:

sudo apt-get install nodejs

Then install npm:

sudo apt-get install npm

Then install bower:

npm install -g bower

For any of the npm package tutorial visit: https://www.npmjs.com/

Here just search the package and you can find how to install, documentation and tutorials as well.

P.S. This is just a very common solution. If your problem still exists you can try the advanced one.

Case insensitive string as HashMap key

Instead of creating your own class to validate and store case insensitive string as a HashMap key, you can use:

LinkedCaseInsensitiveMap wraps a LinkedHashMap, which is a Map based on a hash table and a linked list. Unlike LinkedHashMap, it doesn't allow null key inserting. LinkedCaseInsensitiveMap preserves the original order as well as the original casing of keys while allowing calling functions like get and remove with any case.

Eg:

Map<String, Integer> linkedHashMap = new LinkedCaseInsensitiveMap<>();
linkedHashMap.put("abc", 1);
linkedHashMap.put("AbC", 2);

System.out.println(linkedHashMap);

Output: {AbC=2}

Mvn Dependency:

Spring Core is a Spring Framework module that also provides utility classes, including LinkedCaseInsensitiveMap.

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>5.2.5.RELEASE</version>
</dependency>

CaseInsensitiveMap is a hash-based Map, which converts keys to lower case before they are being added or retrieved. Unlike TreeMap, CaseInsensitiveMap allows null key inserting.

Eg:

Map<String, Integer> commonsHashMap = new CaseInsensitiveMap<>();
commonsHashMap.put("ABC", 1);
commonsHashMap.put("abc", 2);
commonsHashMap.put("aBc", 3);

System.out.println(commonsHashMap);

Output: {abc=3}

Dependency:

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-collections4</artifactId>
    <version>4.4</version>
</dependency>

TreeMap is an implementation of NavigableMap, which means that it always sorts the entries after inserting, based on a given Comparator. Also, TreeMap uses a Comparator to find if an inserted key is a duplicate or a new one.

Therefore, if we provide a case-insensitive String Comparator, we'll get a case-insensitive TreeMap.

Eg:

Map<String, Integer> treeMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
treeMap.put("ABC", 1);
treeMap.put("ABc", 2);
treeMap.put("cde", 1);
        
System.out.println(treeMap);

Output: {ABC=2, cde=1}

CSS Child vs Descendant selectors

CSS selection and applying style to a particular element can be done through traversing through the dom element [Example

Example

.a .b .c .d{
    background: #bdbdbd;
}
div>div>div>div:last-child{
    background: red;
}

<div class='a'>The first paragraph.
 <div class='b'>The second paragraph.
  <div class='c'>The third paragraph.
   <div class='d'>The fourth paragraph.</div>
   <div class='e'>The fourth paragraph.</div>
  </div>
 </div>
</div>

How to export table data in MySql Workbench to csv?

U can use mysql dump or query to export data to csv file

SELECT *
INTO OUTFILE '/tmp/products.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
ESCAPED BY '\\'
LINES TERMINATED BY '\n'
FROM products

Sequelize, convert entity to plain object

Here's what I'm using to get plain response object with non-stringified values and all nested associations from sequelize v4 query.

With plain JavaScript (ES2015+):

const toPlain = response => {
  const flattenDataValues = ({ dataValues }) => {
    const flattenedObject = {};

    Object.keys(dataValues).forEach(key => {
      const dataValue = dataValues[key];

      if (
        Array.isArray(dataValue) &&
        dataValue[0] &&
        dataValue[0].dataValues &&
        typeof dataValue[0].dataValues === 'object'
      ) {
        flattenedObject[key] = dataValues[key].map(flattenDataValues);
      } else if (dataValue && dataValue.dataValues && typeof dataValue.dataValues === 'object') {
        flattenedObject[key] = flattenDataValues(dataValues[key]);
      } else {
        flattenedObject[key] = dataValues[key];
      }
    });

    return flattenedObject;
  };

  return Array.isArray(response) ? response.map(flattenDataValues) : flattenDataValues(response);
};

With lodash (a bit more concise):

const toPlain = response => {
  const flattenDataValues = ({ dataValues }) =>
    _.mapValues(dataValues, value => (
      _.isArray(value) && _.isObject(value[0]) && _.isObject(value[0].dataValues)
        ? _.map(value, flattenDataValues)
        : _.isObject(value) && _.isObject(value.dataValues)
          ? flattenDataValues(value)
          : value
    ));

  return _.isArray(response) ? _.map(response, flattenDataValues) : flattenDataValues(response);
};

Usage:

const res = await User.findAll({
  include: [{
    model: Company,
    as: 'companies',
    include: [{
      model: Member,
      as: 'member',
    }],
  }],
});

const plain = toPlain(res);

// 'plain' now contains simple db object without any getters/setters with following structure:
// [{
//   id: 123,
//   name: 'John',
//   companies: [{
//     id: 234,
//     name: 'Google',
//     members: [{
//       id: 345,
//       name: 'Paul',
//     }]
//   }]
// }]

How do I copy an object in Java?

You can try to implement Cloneable and use the clone() method; however, if you use the clone method you should - by standard - ALWAYS override Object's public Object clone() method.

How do I import modules or install extensions in PostgreSQL 9.1+?

The extensions available for each version of Postgresql vary. An easy way to check which extensions are available is, as has been already mentioned:

SELECT * FROM pg_available_extensions;

If the extension that you are looking for is available, you can install it using:

CREATE EXTENSION 'extensionName';

or if you want to drop it use:

DROP EXTENSION 'extensionName';

With psql you can additionally check if the extension has been successfully installed using \dx, and find more details about the extension using \dx+ extensioName. It returns additional information about the extension, like which packages are used with it.

If the extension is not available in your Postgres version, then you need to download the necessary binary files and libraries and locate it them at /usr/share/conrib

Node JS Error: ENOENT

You can include a different jade file into your template, that to from a different directory

views/
     layout.jade
static/
     page.jade

To include the layout file from views dir to static/page.jade

page.jade

extends ../views/layout

Excel 2010: how to use autocomplete in validation list

As other people suggested, you need to use a combobox. However, most tutorials show you how to set up just one combobox and the process is quite tedious.

As I faced this problem before when entering a large amount of data from a list, I can suggest you use this autocomplete add-in . It helps you create the combobox on any cells you select and you can define a list to appear in the dropdown.

Customize Bootstrap checkboxes

As others have said, the style you're after is actually just the Mac OS checkbox style, so it will look radically different on other devices.

In fact both screenshots you linked show what checkboxes look like on Mac OS in Chrome, the grey one is shown at non-100% zoom levels.

How to add text to an existing div with jquery

Very easy from My side:-

<html>
<head>
<script
    src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
    $(document).ready(function() {
        $("input").click(function() {
            $('<input type="text" name="name" value="value"/>').appendTo('#testdiv');
        });

    });
</script>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    <div id="testdiv"></div>
    <input type="button" value="Add" />
</body>
</html>

XML Error: Extra content at the end of the document

You need a root node

<?xml version="1.0" encoding="ISO-8859-1"?>    
<documents>
    <document>
        <name>Sample Document</name>
        <type>document</type>
        <url>http://nsc-component.webs.com/Office/Editor/new-doc.html?docname=New+Document&amp;titletype=Title&amp;fontsize=9&amp;fontface=Arial&amp;spacing=1.0&amp;text=&amp;wordcount3=0</url>
    </document>

    <document>
        <name>Sample</name>
        <type>document</type>
        <url>http://nsc-component.webs.com/Office/Editor/new-doc.html?docname=New+Document&amp;titletype=Title&amp;fontsize=9&amp;fontface=Arial&amp;spacing=1.0&amp;text=&amp;</url>
    </document>
</documents>

ModelState.IsValid == false, why?

As you are probably programming in Visual studio you'd better take advantage of the possibility of using breakpoints for such easy debugging steps (getting an idea what the problem is as in your case). Just place them just in front / at the place where you check ModelState.isValid and hover over the ModelState. Now you can easily browse through all the values inside and see what error causes the isvalid return false.

modelstate

How to tell if a connection is dead in python

If I'm not mistaken this is usually handled via a timeout.

How to strip comma in Python string

You want to replace it, not strip it:

s = s.replace(',', '')

How to replace all special character into a string using C#

Assume you want to replace symbols which are not digits or letters (and _ character as @Guffa correctly pointed):

string input = "Hello@Hello&Hello(Hello)";
string result = Regex.Replace(input, @"[^\w\d]", ",");
// Hello,Hello,Hello,Hello,

You can add another symbols which should not be replaced. E.g. if you want white space symbols to stay, then just add \s to pattern: \[^\w\d\s]

Programmatically Install Certificate into Mozilla

I was trying to achieve the same thing in Powershell and wrote a script to perform various functions that can be interactively selected. Of course, it's fairly easy to modify the script to automate certain things instead of provide options.

I'm an Infrastructure guy rather than a coder/programmer, so apologies if it's a bit cumbersome (but it does work!!).

Save the following as a PS1:

##################################################################################################
#  
# NAME: RegisterFireFoxCertificates.ps1
#  
# AUTHOR: Andy Pyne
# 
# DATE  : 22.07.2015
#  
# COMMENT: To provide options for listing, adding, deleting and purging
# FireFox Certificates using Mozilla's NSS Util CertUtil
# Source: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/tools/NSS_Tools_certutil
#
# NOTE: You need a copy of the NSS Util CertUtil and it's associated dll's
# The specific files I used were:
# 
# certutil.exe, fort32.dll, freebl3.dll, libnspr4.dll, libplc4.dll, libplds4.dll, nspr4.dll, 
# nss3.dll, nssckbi.dll, nssdbm3.dll, nssutil3.dll, plc4.dll, plds4.dll, smime3.dll, 
# softokn3.dll, sqlite3.dll, ssl3.dll, swft32.dll
#
##################################################################################################

##################################################################################################

# Setup a few parameters
$ErrorActionPreference = "Silentlycontinue"
$ExecutionPolicyOriginal = Get-ExecutionPolicy
$FireFoxExecutable = "C:\Program Files (x86)\Mozilla Firefox\Firefox.exe" 

# This is the Firefox certificate database
$CertDB = "Cert8.db"

# The Certificate Nickname is a name you want to see on the certificates that you've imported in - so you know they were imported by this process
# However, when you look at the certificates in Firefox, they will be listed under whatever the certificate name was when it was generated
# So if your certificate is listed as 'Company123' when imported, it will still be called that as the Common Name, but when you click to view
# it, you will see that the first item in the Certificate Fields is what you 'nicknamed' it.
$CertificateNickname = "MyCompanyName FF AutoImport Cert"

# The Legacy Certificates are specific/explicit certificates which you wish to delete (The 'purge' option later in the script references these items)
$LegacyCertificates = @("OldCertificate1", "Company Cert XYZ", "Previous Company name", "Unwanted Certificate - 7", "123APTEST123")

# This is the list of databases / Firefox profiles on the machine
$FFDBList = @()

# Making sure our temporary directory is empty
$FFCertLocationLocal = "C:\FFCertTemp"

# The remote location of the certificates and 
$FFCertLocationRemote = "\\myUNC\NETLOGON\FireFoxCert\"

# The local CertUtil executable (this is copied from the remote location above)
$FFCertTool = "$FFCertLocationLocal\CertUtil.exe"

# Making sure our temporary directory is empty
Remove-Item $FFCertLocationLocal -Recurse
New-Item -ItemType Directory -Path $FFCertLocationLocal

##################################################################################################

##################################################################################################


Clear

# We're going to get a list of the Firefox processes on the machine that are open and close them
# Otherwise the add/delete parts might not be successful with Firefox still running
$FireFoxRunningProcessesList = Get-Process | Where-Object {$_.Name -Match "FireFox"} | Select-Object ProcessName,Id | Format-Table -AutoSize
$FireFoxRunningProcesses = Get-Process | Where-Object {$_.Name -Match "FireFox"} | Select-Object -ExpandProperty Id
If (!$FireFoxRunningProcesses) {}
Else {
Write-Host "The following processes will be stopped to perform certificate manipulation:"
$FireFoxRunningProcessesList
$TerminateProcessQuestion = Read-Host "To auto-terminate (ungracefully!) processes, press 'Y', otherwise, press any other key"
If ($TerminateProcessQuestion -ne 'y') {
Clear
Write-Host "Cannot continue as Firefox process is still running, ending script ..."
Exit} 
Else {ForEach ($FireFoxRunningProcess in $FireFoxRunningProcesses) {
[Int]$FireFoxRunningProcess = [Convert]::ToInt32($FireFoxRunningProcess, 10)
Stop-Process -Id $FireFoxRunningProcess -Force}}
}

##################################################################################################

##################################################################################################

# The remote files (certificates and the NSS Tools CertUtil files are copied locally)
$FFCertificateListItemRemote = Get-ChildItem $FFCertLocationRemote -Recurse -Include *.cer,*.dll,certutil.exe
ForEach ($FFCertificateItemRemote in $FFCertificateListItemRemote) {
Copy-Item $FFCertificateItemRemote.FullName -Destination $FFCertLocationLocal}

# Get a list of the local certificates
$FFCertificateListLocal = Get-ChildItem $FFCertLocationLocal -Recurse -filter *.cer

Clear
Set-ExecutionPolicy "Unrestricted"

# Find all Firefox profiles and create an array called FFDBList
# Of course, you'll only be able to get to the ones your permissions allow
$LocalProfiles = Get-ChildItem "C:\Users" | Select-Object -ExpandProperty FullName
ForEach ($LocalProfile in $LocalProfiles) {
$FFProfile = Get-ChildItem "$LocalProfile\AppData\Roaming\Mozilla\Firefox\Profiles" | Select-Object -ExpandProperty FullName
If (!$FFProfile) {Write-Host "There is no Firefox Profile for $LocalProfile"}
ELSE {$FFDBList += $FFProfile}
}

Clear
Write-Host "#################################"
Write-Host "The List of FireFox Profiles is:"
Write-Host "#################################"
$FFDBList
PAUSE

##################################################################################################

##################################################################################################

# Setup 4x functions (List, Delete, Add and Purge)
#
# - List will simply list certificates from the Firefox profiles
#
# - Delete will delete the certificates the same as the certificates you're going to add back in
#   So for example, if you have 2x certificates copied earlier for import, 'CompanyA' and 'CompanyZ'
#   then you can delete certificates with these names beforehand. This will prevent the 
#   certificates you want to import being skipped/duplicated because they already exist
#
# - Add will simply add the list of certificates you've copied locally
#
# - Purge will allow you to delete 'other' certificates that you've manually listed in the
#   variable '$LegacyCertificates' at the top of the script

# Each of the functions perform the same 4x basic steps
#
# 1) Do the following 3x things for each of the Firefox profiles
# 2) Do the 2x following things for each of the certificates
# 3) Generate an expression using parameters based on the certificate nickname specified
#    earlier, and the profile and certificate informaiton
# 4) Invoke the expression

Function ListCertificates {
Write-Host "#############################"
ForEach ($FFDBItem in $FFDBList) {
$FFCertificateListItemFull = $FFCertificateListItem.FullName
Write-Host "Listing Certificates for $FFDBitem"
$ExpressionToListCerts = "$FFCertTool -L -d `"$FFDBItem`""
Invoke-Expression $ExpressionToListCerts
}
PAUSE}

Function DeleteOldCertificates {
Write-Host "#############################"
ForEach ($FFDBItem in $FFDBList) {
ForEach ($FFCertificateListItem in $FFCertificateListLocal) {
$FFCertificateListItemFull = $FFCertificateListItem.FullName
Write-Host "Deleting Cert $FFCertificateListItem for $FFDBitem"
$ExpressionToDeleteCerts = "$FFCertTool -D -n `"$CertificateNickname`" -d `"$FFDBItem`""
Invoke-Expression $ExpressionToDeleteCerts
}}
PAUSE}

Function AddCertificates {
Write-Host "#############################"
ForEach ($FFDBItem in $FFDBList) {
ForEach ($FFCertificateListItem in $FFCertificateListLocal) {
$FFCertificateListItemFull = $FFCertificateListItem.FullName
Write-Host "Adding $FFCertificateListItem Cert for $FFDBitem"
$ExpressionToAddCerts = "$FFCertTool -A -n `"$CertificateNickname`" -t `"CT,C,C`" -d `"$FFDBItem`" -i `"$FFCertificateListItemFull`""
Write-Host $ExpressionToAddCerts
Invoke-Expression $ExpressionToAddCerts
#PAUSE
}}
PAUSE}

Function PurgeLegacyCertificates {
Write-Host "#############################"
ForEach ($FFDBItem in $FFDBList) {
ForEach ($LegacyCertificateItem in $LegacyCertificates) {
$LegacyCertificateItemFull = $LegacyCertificateItem.FullName
Write-Host "Purging Old Certs ($LegacyCertificateItem) for $FFDBitem"
#$ExpressionToDeleteLegacyCerts = "$FFCertTool -D -n `"$OldCertificate`" -d `"$FFDBItem`""
$ExpressionToDeleteLegacyCerts = "$FFCertTool -D -n `"$LegacyCertificateItem`" -d `"$FFDBItem`""
ForEach ($LegacyCertificate in $LegacyCertificates) {
Invoke-Expression $ExpressionToDeleteLegacyCerts}
}}
PAUSE}

##################################################################################################

##################################################################################################

    # Creating a few options to invoke the various functions created above

$CertificateAction = ""

Function CertificateActionSelection {
Do {
Clear
$CertificateAction = Read-Host "Would you like to [L]ist all certificates [D]elete all old certificates, [A]dd new certificates, or [P]urge legacy certificates?"
} Until ($CertificateAction -eq "L" -or $CertificateAction -eq "D" -or $CertificateAction -eq "A" -or $CertificateAction -eq "P" )

If ($CertificateAction -eq "L") {ListCertificates}
If ($CertificateAction -eq "D") {DeleteOldCertificates}
If ($CertificateAction -eq "A") {AddCertificates}
If ($CertificateAction -eq "P") {PurgeLegacyCertificates}
}

Do {
Clear
$MoreCertificateActions = Read-Host "Would you like to [L]aunch Firefox (as $env:USERNAME), take a [C]ertificate action, or [Q]uit?"
If ($MoreCertificateActions -eq "L") {
Invoke-Item $FireFoxExecutable
Exit}
If ($MoreCertificateActions -eq "C") {CertificateActionSelection}

} Until ($MoreCertificateActions -eq "Q")

Remove-Item $FFCertLocationLocal -Recurse
Set-ExecutionPolicy $ExecutionPolicyOriginal

Exit

How to convert a Date to a formatted string in VB.net?

You can use the ToString overload. Have a look at this page for more info

So just Use myDate.ToString("yyyy-MM-dd HH:mm:ss")

or something equivalent

getch and arrow codes

I'm Just a starter, but i'v created a char(for example "b"), and I do b = _getch(); (its a conio.h library's command) And check

If (b == -32)
b = _getch();

And do check for the keys (72 up, 80 down, 77 right, 75 left)

Read pdf files with php

Check out FPDF (with FPDI):

http://www.fpdf.org/

http://www.setasign.de/products/pdf-php-solutions/fpdi/

These will let you open an pdf and add content to it in PHP. I'm guessing you can also use their functionality to search through the existing content for the values you need.

Another possible library is TCPDF: https://tcpdf.org/

Update to add a more modern library: PDF Parser

DISABLE the Horizontal Scroll

You can try this all of method in our html page..

1st way

body { overflow-x:hidden; }

2nd way You can use the following in your CSS body tag:

overflow-y: scroll; overflow-x: hidden;

That will remove your scrollbar.

3rd way

body { min-width: 1167px; }

5th way

html, body { max-width: 100%; overflow-x: hidden; }

6th way

element { max-width: 100vw; overflow-x: hidden; }

4th way..

var docWidth = document.documentElement.offsetWidth; [].forEach.call( document.querySelectorAll('*'), function(el) { if (el.offsetWidth > docWidth) { console.log(el); } } );

Now i m searching about more..!!!!

Python "TypeError: unhashable type: 'slice'" for encoding categorical data

I was getting same error (TypeError: unhashable type: 'slice') with below code:

included_cols = [2,4,10]
dataset = dataset[:,included_cols]  #Columns 2,4 and 10 are included.

Resolved with below code by putting iloc after dataset:

included_cols = [2,4,10]
dataset = dataset.iloc[:,included_cols]  #Columns 2,4 and 10 are included.

NoClassDefFoundError while trying to run my jar with java.exe -jar...what's wrong?

if you use external libraries in your program and you try to pack all together in a jar file it's not that simple, because of classpath issues etc.

I'd prefer to use OneJar for this issue.

When is a timestamp (auto) updated?

Give the command SHOW CREATE TABLE whatever

Then look at the table definition.

It probably has a line like this

logtime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

in it. DEFAULT CURRENT_TIMESTAMP means that any INSERT without an explicit time stamp setting uses the current time. Likewise, ON UPDATE CURRENT_TIMESTAMP means that any update without an explicit timestamp results in an update to the current timestamp value.

You can control this default behavior when creating your table.

Or, if the timestamp column wasn't created correctly in the first place, you can change it.

ALTER TABLE whatevertable
     CHANGE whatevercolumn 
            whatevercolumn TIMESTAMP NOT NULL
                           DEFAULT CURRENT_TIMESTAMP 
                           ON UPDATE CURRENT_TIMESTAMP;

This will cause both INSERT and UPDATE operations on the table automatically to update your timestamp column. If you want to update whatevertable without changing the timestamp, that is,

To prevent the column from updating when other columns change

then you need to issue this kind of update.

UPDATE whatevertable
   SET something = 'newvalue',
       whatevercolumn = whatevercolumn
 WHERE someindex = 'indexvalue'

This works with TIMESTAMP and DATETIME columns. (Prior to MySQL version 5.6.5 it only worked with TIMESTAMPs) When you use TIMESTAMPs, time zones are accounted for: on a correctly configured server machine, those values are always stored in UTC and translated to local time upon retrieval.

Insert line break in wrapped cell via code

Yes there are two way to add a line feed:

Use the existing function from VBA vbCrLf in the string you want to add a line feed, as such:

Dim text As String

text = "Hello" & vbCrLf & "World!"

Worksheets(1).Cells(1, 1) = text
Use the Chr() function and pass the ASCII characters 13 and 10 in order to add a line feed, as shown bellow:

Dim text As String

text = "Hello" & Chr(13) & Chr(10) & "World!"

Worksheets(1).Cells(1, 1) = text

In both cases, you will have the same output in cell (1,1) or A1.

What is the maximum value for an int32?

It is very easy to remember. In hexadecimal one digit is 4 bits. So for unsigned int write 0x and 8 fs (0xffffffff) into a Python or Ruby shell to get the value in base 10. If you need the signed value, just remember that the highest bit is used as the sign. So you have to leave that out. You only need to remember that the number where the lower 3 bits are 1 and the 4th bit is 0 equals 7, so write 0x7fffffff into a Python or Ruby shell. You could also write 0x100000000 - 1 and 0x80000000 - 1, if that is more easy to you to remember.

Chart.js - Formatting Y axis

scaleLabel : "<%= Number(value).toFixed(2).replace('.', ',') + ' $'%>"

Rolling back bad changes with svn in Eclipse

The svnbook has a section on how Subversion allows you to revert the changes from a particular revision without affecting the changes that occured in subsequent revisions:

http://svnbook.red-bean.com/en/1.4/svn.branchmerge.commonuses.html#svn.branchmerge.commonuses.undo

I don't use Eclipse much, but in TortoiseSVN you can do this from the from the log dialogue; simply right-click on the revision you want to revert and select "Revert changes from this revision".

In the case that the files for which you want to revert "bad changes" had "good changes" in subsequent revisions, then the process is the same. The changes from the "bad" revision will be reverted leaving the changes from "good" revisions untouched, however you might get conflicts.

XML Schema minOccurs / maxOccurs default values

example:

XML

<?xml version="1.0" encoding="UTF-8"?> 
<?xml-stylesheet type="text/xsl" href="country.xsl"?>
<country xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="country.xsd">
    <countryName>Australia</countryName>
    <capital>Canberra</capital>
    <nationalLanguage>English</nationalLanguage>
    <population>21000000</population>
    <currency>Australian Dollar</currency>
    <nationalIdentities>
        <nationalAnthem>Advance Australia Fair</nationalAnthem>
        <nationalDay>Australia Day (26 January)</nationalDay>
        <nationalColour>Green and Gold</nationalColour>
        <nationalGemstone>Opal</nationalGemstone>
        <nationalFlower>Wattle (Acacia pycnantha)</nationalFlower>
    </nationalIdentities>
    <publicHolidays>
        <newYearDay>1 January</newYearDay>
        <australiaDay>26 January</australiaDay>
        <anzacDay>25 April</anzacDay>
        <christmasDay>25 December</christmasDay>
        <boxingDay>26 December</boxingDay>
        <laborDay>Variable Date</laborDay>
        <easter>Variable Date</easter>
        <queenBirthDay>21 April (Variable Date)</queenBirthDay>
    </publicHolidays>
    <states>
        <stateName><Name>NSW -  New South Wales</Name></stateName>
        <stateName><Name>VIC -  Victoria</Name></stateName>
        <stateName><Name>QLD -  Queensland</Name></stateName>
        <stateName><Name>SA -  South Australia</Name></stateName>
        <stateName><Name>WA -  Western Australia</Name></stateName>
        <stateName><Name>TAS -  Tasmania</Name></stateName>
    </states>
    <territories>
        <territoryName>ACT -  Australian Capital Territory</territoryName>
        <territoryName>NT -  Northern Territory</territoryName>
    </territories>
</country>

XSD:

<?xml version="1.0" encoding="UTF-8"?> 
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="country">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="countryName" type="xs:string"/>
                <xs:element name="capital" type="xs:string"/>
                <xs:element name="nationalLanguage" type="xs:string"/>
                <xs:element name="population" type="xs:double"/>
                <xs:element name="currency" type="xs:string"/>
                <xs:element name="nationalIdentities">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="nationalAnthem" type="xs:string"/>
                        <xs:element name="nationalDay" type="xs:string"/>
                        <xs:element name="nationalColour" type="xs:string"/>
                        <xs:element name="nationalGemstone" type="xs:string"/>
                        <xs:element name="nationalFlower" type="xs:string"/>
                    </xs:sequence>
                </xs:complexType>
                </xs:element>
                <xs:element name="publicHolidays">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="newYearDay" maxOccurs="1" type="xs:string"/>
                            <xs:element name="australiaDay" maxOccurs="1" type="xs:string"/>
                            <xs:element name="anzacDay" maxOccurs="1" type="xs:string"/>
                            <xs:element name="christmasDay" maxOccurs="1" type="xs:string"/>
                            <xs:element name="boxingDay" maxOccurs="1" type="xs:string"/>
                            <xs:element name="laborDay" maxOccurs="1" type="xs:string"/>
                            <xs:element name="easter" maxOccurs="1" type="xs:string"/>
                            <xs:element name="queenBirthDay" maxOccurs="1" type="xs:string"/>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
                <xs:element name="states">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="stateName" minOccurs="1" maxOccurs="unbounded">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element name="Name" type="xs:string"/>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
                <xs:element name="territories">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="territoryName" maxOccurs="unbounded"/>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

XSL:

<?xml version="1.0"?> 
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="html" indent="yes" version="4.0"/>
    <xsl:template match="/">
        <html>
            <body>          
                <xsl:for-each select="country">         
                    <xsl:value-of select="countryName"/><br/>
                    <xsl:value-of select="capital"/><br/>
                    <xsl:value-of select="nationalLanguage"/><br/>
                    <xsl:value-of select="population"/><br/>
                    <xsl:value-of select="currency"/><br/>              
                    <xsl:for-each select="nationalIdentities">
                        <xsl:value-of select="nationalAnthem"/><br/>
                        <xsl:value-of select="nationalDay"/><br/>
                        <xsl:value-of select="nationalColour"/><br/>
                        <xsl:value-of select="nationalGemstone"/><br/>
                        <xsl:value-of select="nationalFlower"/><br/>
                    </xsl:for-each>
                    <xsl:for-each select="publicHolidays">
                        <xsl:value-of select="newYearDay"/><br/>
                        <xsl:value-of select="australiaDay"/><br/>
                        <xsl:value-of select="anzacDay"/><br/>
                        <xsl:value-of select="christmasDay"/><br/>
                        <xsl:value-of select="boxingDay"/><br/>
                        <xsl:value-of select="laborDay"/><br/>
                        <xsl:value-of select="easter"/><br/>
                        <xsl:value-of select="queenBirthDay"/><br/>
                    </xsl:for-each>
                    <xsl:for-each select="states/stateName">
                        <xsl:value-of select="Name"/><br/>
                    </xsl:for-each>
                </xsl:for-each>
            </body>
        </html>
    </xsl:template>
</xsl:stylesheet>

Result:

Australia
Canberra
English
21000000
Australian Dollar
Advance Australia Fair
Australia Day (26 January)
Green and Gold
Opal
Wattle (Acacia pycnantha)
1 January
26 January
25 April
25 December
26 December
Variable Date
Variable Date
21 April (Variable Date)
NSW - New South Wales
VIC - Victoria
QLD - Queensland
SA - South Australia
WA - Western Australia
TAS - Tasmania

How can I start and check my MySQL log?

For me, general_log didn't worked. But adding this to my.ini worked

[mysqld]
log-output=FILE
slow_query_log = 1
slow_query_log_file = "d:/temp/developer.log"

Use find command but exclude files in two directories

You can try below:

find ./ ! \( -path ./tmp -prune \) ! \( -path ./scripts -prune \) -type f -name '*_peaks.bed'

Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?

Everything is dangerous if you don't know what you are doing

Even high-precision decimal types can't save the day:

declare @num1 numeric(38,22)
declare @num2 numeric(38,22)
set @num1 = .0000006
set @num2 = 1.0
select @num1 * @num2 * 1000000

1.000000 <- Should be 0.6000000

The money types are integers

The text representations of smallmoney and decimal(10,4) may look alike, but that doesn't make them interchangeable. Do you cringe when you see dates stored as varchar(10)? This is the same thing.

Behind the scenes, money/smallmoney are just a bigint/int The decimal point in the text representation of money is visual fluff, just like the dashes in a yyyy-mm-dd date. SQL doesn't actually store those internally.

Regarding decimal vs money, pick whatever is appropriate for your needs. The money types exist because storing accounting values as integer multiples of 1/10000th of unit is very common. Also, if you are dealing with actual money and calculations beyond simple addition and subtraction, you shouldn't be doing that at the database level! Do it at the application level with a library that supports Banker's Rounding (IEEE 754)

Query to get only numbers from a string

If you are using Postgres and you have data like '2000 - some sample text' then try substring and position combination, otherwise if in your scenario there is no delimiter, you need to write regex:

SUBSTRING(Column_name from 0 for POSITION('-' in column_name) - 1) as 
number_column_name

Set background image in CSS using jquery

<div class="rmz-srchbg">
  <input type="text" id="globalsearchstr" name="search" value="" class="rmz-txtbox">
  <input type="submit" value="&nbsp;" id="srchbtn" class="rmz-srchico">
  <br style="clear:both;">
</div>

$(document).ready(function() {
  $('#globalsearchstr').bind('mouseenter', function() {
    $(this).parent().css("background", "black");
  });
});

addEventListener for keydown on Canvas

Set the tabindex of the canvas element to 1 or something like this

<canvas tabindex='1'></canvas>

It's an old trick to make any element focusable

How are software license keys generated?

When I originally wrote this answer it was under an assumption that the question was regarding 'offline' validation of licence keys. Most of the other answers address online verification, which is significantly easier to handle (most of the logic can be done server side).

With offline verification the most difficult thing is ensuring that you can generate a huge number of unique licence keys, and still maintain a strong algorithm that isnt easily compromised (such as a simple check digit)

I'm not very well versed in mathematics, but it struck me that one way to do this is to use a mathematical function that plots a graph

The plotted line can have (if you use a fine enough frequency) thousands of unique points, so you can generate keys by picking random points on that graph and encoding the values in some way

enter image description here

As an example, we'll plot this graph, pick four points and encode into a string as "0,-500;100,-300;200,-100;100,600"

We'll encrypt the string with a known and fixed key (horribly weak, but it serves a purpose), then convert the resulting bytes through Base32 to generate the final key

The application can then reverse this process (base32 to real number, decrypt, decode the points) and then check each of those points is on our secret graph.

Its a fairly small amount of code which would allow for a huge number of unique and valid keys to be generated

It is however very much security by obscurity. Anyone taking the time to disassemble the code would be able to find the graphing function and encryption keys, then mock up a key generator, but its probably quite useful for slowing down casual piracy.

'cl' is not recognized as an internal or external command,

I had this problem because I forgot to select "Visual C++" when I was installing Visual Studio.

To add it, see: https://stackoverflow.com/a/31568246/1054322

Heroku: How to push different local Git branches to Heroku/master

I found this helpful. http://jqr.github.com/2009/04/25/deploying-multiple-environments-on-heroku.html

HTML - How to do a Confirmation popup to a Submit button and then send the request?

I believe you want to use confirm()

<script type="text/javascript">
    function clicked() {
       if (confirm('Do you want to submit?')) {
           yourformelement.submit();
       } else {
           return false;
       }
    }

</script>

How to change the icon of .bat file programmatically?

One of the way you can achieve this is:

Create an executable Jar file
Create a batch file to run the above jar and launch the desktop java application.
Use Batch2Exe converter and covert to batch file to Exe.
During above conversion, you can change the icon to that of your choice.(must of valid .ico file)
Place the short cut for the above exe on desktop.

Now your java program can be opened in a fancy way just like any other MSWindows apps.! :)

How to change maximum number of POST variable in PHP?

Generating random numbers in C

Also, linear congruential PRNGs tend to produce more randomness on the higher bits that on the lower bits, so to cap the result don't use modulo, but instead use something like:

j = 1 + (int) (10.0 * (rand() / (RAND_MAX + 1.0)));

(This one is from "Numerical Recipes in C", ch.7)

How to use AND in IF Statement

If you are simply looking for the occurrence of "Miami" or "Florida" inside a string (since you put * at both ends), it's probably better to use the InStr function instead of Like. Not only are the results more predictable, but I believe you'll get better performance.

Also, VBA is not short-circuited so when you use the AND keyword, it will test both sides of the AND, regardless if the first test failed or not. In VBA, it is more optimal to use 2 if-statements in these cases, that way you aren't checking for "Florida" if you don't find "Miami".

The other advice I have is that a for-each loop is faster than a for-loop. Using .offset, you can achieve the same thing, but with better effeciency. Of course there are even better ways (like variant arrays), but those will add a layer of complexity not needed in this example.

Here is some sample code:

Sub test()

Application.ScreenUpdating = False
Dim lastRow As Long
Dim cell As Range
lastRow = Range("A" & Rows.Count).End(xlUp).Row

For Each cell In Range("A1:A" & lastRow)
    If InStr(1, cell.Value, "Miami") <> 0 Then
        If InStr(1, cell.Offset(, 3).Value, "Florida") <> 0 Then
            cell.Offset(, 2).Value = "BA"
        End If
    End If
Next

Application.ScreenUpdating = True
End Sub

I hope you find some of this helpful, and keep at it with VBA! ^^

Usage of MySQL's "IF EXISTS"

You cannot use IF control block OUTSIDE of functions. So that affects both of your queries.

Turn the EXISTS clause into a subquery instead within an IF function

SELECT IF( EXISTS(
             SELECT *
             FROM gdata_calendars
             WHERE `group` =  ? AND id = ?), 1, 0)

In fact, booleans are returned as 1 or 0

SELECT EXISTS(
         SELECT *
         FROM gdata_calendars
         WHERE `group` =  ? AND id = ?)

How might I extract the property values of a JavaScript object into an array?

Maybe a bit verbose, but robust and fast

var result = [];
var keys = Object.keys(myObject);
for (var i = 0, len = keys.length; i < len; i++) {
    result.push(myObject[keys[i]]);
}

Storing files in SQL Server

You might read up on FILESTREAM. Here is some info from the docs that should help you decide:

If the following conditions are true, you should consider using FILESTREAM:

Objects that are being stored are, on average, larger than 1 MB.

Fast read access is important.

You are developing applications that use a middle tier for application logic.

For smaller objects, storing varbinary(max) BLOBs in the database often provides better streaming performance.

Remove white space below image

I've set up a JSFiddle to test several different solutions to this problem. Based on the [vague] criteria of

1) Maximum flexibility

2) No weird behavior

The accepted answer here of

img { display: block; }

which is recommended by a lot of people (such as in this excellent article), actually ranks fourth.

1st, 2nd, and 3rd place are all a toss-up between these three solutions:

1) The solution given by @Dave Kok and @Hasan Gursoy:

img { vertical-align: top; } /* or bottom */

pros:

All display values work on both the parent and img.
No very strange behavior; any siblings of the img fall where you'd expect them to.
Very efficient.

cons:

In the [perfectly valid] case of both the parent and img having `display: inline`, the value of this property can determine the position of the img's parent (a bit strange).

2) Setting font-size: 0; on the parent element:

.parent {
    font-size: 0;
    vertical-align: top;
}
.parent > * {
    font-size: 16px;
    vertical-align: top;
}

Since this one [kind of] requires vertical-align: top on the img, this is basically an extension of the 1st solution.

pros:

All display values work on both the parent and img.
No very strange behavior; any siblings of the img fall where you'd expect them to.
Fixes the inline whitespace problem for any siblings of the img.
Although this still moves the position of the parent in the case of the parent and img both having `display: inline`, at least you can't see the parent anymore.

cons:

Less efficient code.
This assumes "correct" markup; if the img has text node siblings, they won't show up.

3) Setting line-height: 0 on the parent element:

.parent {
    line-height: 0;
    vertical-align: top;
}
.parent > * {
    line-height: 1.15;
    vertical-align: top;
}

Similar to the 2nd solution in that, to make it fully flexible, it basically becomes an extension of the 1st.

pros:

Behaves like the first two solutions on all display combinations except when the parent and img have `display: inline`.

cons:

Less efficient code.
In the case of both the parent and img having `display: inline`, we get all sorts of crazy. (Maybe playing with the `line-height` property isn't the best idea...)

So there you have it. I hope this helps some poor soul.

How to get a table cell value using jQuery?

If you can, it might be worth using a class attribute on the TD containing the customer ID so you can write:

$('#mytable tr').each(function() {
    var customerId = $(this).find(".customerIDCell").html();    
 });

Essentially this is the same as the other solutions (possibly because I copy-pasted), but has the advantage that you won't need to change the structure of your code if you move around the columns, or even put the customer ID into a <span>, provided you keep the class attribute with it.

By the way, I think you could do it in one selector:

$('#mytable .customerIDCell').each(function() {
  alert($(this).html());
});

If that makes things easier.

How to get just one file from another branch

How to check out one or more files from another branch or commit hash into your currently-checked-out branch:

# check out all files in <paths> from branch <branch_name>
git checkout <branch_name> -- <paths>

Source: http://nicolasgallagher.com/git-checkout-specific-files-from-another-branch/.

PowerShell : retrieve JSON object by field value

David Brabant's answer led me to what I needed, with this addition:

x.Stuffs | where { $_.Name -eq "Darts" } | Select -ExpandProperty Type

jQuery or Javascript - how to disable window scroll without overflow:hidden;

CSS 'fixed' solution (like Facebook does):

body_temp = $("<div class='body_temp' />")
    .append($('body').contents())
    .css('position', 'fixed')
    .css('top', "-" + scrolltop + 'px')
    .width($(window).width())
    .appendTo('body');

to toggle to normal state:

var scrolltop = Math.abs($('.body_temp').position().top);
$('body').append($('.body_temp').contents()).scrollTop(scrolltop);

Set default value of an integer column SQLite

It happens that I'm just starting to learn coding and I needed something similar as you have just asked in SQLite (I´m using [SQLiteStudio] (3.1.1)).

It happens that you must define the column's 'Constraint' as 'Not Null' then entering your desired definition using 'Default' 'Constraint' or it will not work (I don't know if this is an SQLite or the program requirment).

Here is the code I used:

CREATE TABLE <MY_TABLE> (
<MY_TABLE_KEY>       INTEGER    UNIQUE
                                PRIMARY KEY,
<MY_TABLE_SERIAL>    TEXT       DEFAULT (<MY_VALUE>) 
                                NOT NULL
<THE_REST_COLUMNS>
);

The EntityManager is closed

I found an interesting article about this problem

if (!$entityManager->isOpen()) {
  $entityManager = $entityManager->create(
    $entityManager->getConnection(), $entityManager->getConfiguration());
}

Doctrine 2 Exception EntityManager is closed

Date only from TextBoxFor()

I use Globalize so work with many date formats so use the following:

@Html.TextBoxFor(m => m.DateOfBirth, "{0:d}")

This will automatically adjust the date format to the browser's locale settings.

how do I create an array in jquery?

Not completely clear what you mean. Perhaps:

<script type="text/javascript"> 
$(document).ready(function() {
  $("a").click(function() {
    var params = {};
    params['pageNo'] = $(this).text();
    params['sortBy'] = $("#sortBy").val();
    $("#results").load( "jquery-routing.php", params );
    return false;
  });
}); 
</script>

Daemon not running. Starting it now on port 5037

Reference link: http://www.programering.com/a/MTNyUDMwATA.html

Steps I followed 1) Execute the command adb nodaemon server in command prompt Output at command prompt will be: The following error occurred cannot bind 'tcp:5037' The original ADB server port binding failed

2) Enter the following command query which using port 5037 netstat -ano | findstr "5037" The following information will be prompted on command prompt: TCP 127.0.0.1:5037 0.0.0.0:0 LISTENING 9288

3) View the task manager, close all adb.exe

4) Restart eclipse or other IDE

The above steps worked for me.

How to detect reliably Mac OS X, iOS, Linux, Windows in C preprocessor?

There are predefined macros that are used by most compilers, you can find the list here. GCC compiler predefined macros can be found here. Here is an example for gcc:

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
   //define something for Windows (32-bit and 64-bit, this part is common)
   #ifdef _WIN64
      //define something for Windows (64-bit only)
   #else
      //define something for Windows (32-bit only)
   #endif
#elif __APPLE__
    #include <TargetConditionals.h>
    #if TARGET_IPHONE_SIMULATOR
         // iOS Simulator
    #elif TARGET_OS_IPHONE
        // iOS device
    #elif TARGET_OS_MAC
        // Other kinds of Mac OS
    #else
    #   error "Unknown Apple platform"
    #endif
#elif __linux__
    // linux
#elif __unix__ // all unices not caught above
    // Unix
#elif defined(_POSIX_VERSION)
    // POSIX
#else
#   error "Unknown compiler"
#endif

The defined macros depend on the compiler that you are going to use.

The _WIN64 #ifdef can be nested into the _WIN32 #ifdef because _WIN32 is even defined when targeting the Windows x64 version. This prevents code duplication if some header includes are common to both (also WIN32 without underscore allows IDE to highlight the right partition of code).

Landscape printing from HTML

If you want to see landscape on the screen before you print, as well as printing, then in your css, you can set the width to 900px, and the height to 612px.

OP didn't mention A4 size. I assume it's Letter size in my numbers above.

Regex for empty string or white space

If one only cares about whitespace at the beginning and end of the string (but not in the middle), then another option is to use String.trim():

"    your string contents  ".trim();

// => "your string contents"

What is the difference between onBlur and onChange attribute in HTML?

onBlur is when your focus is no longer on the field in question.

The onblur property returns the onBlur event handler code, if any, that exists on the current element.

onChange is when the value of the field changes.

How to resize the jQuery DatePicker control

Another approach:

$('.your-container').datepicker({
    beforeShow: function(input, datepickerInstance) {
        datepickerInstance.dpDiv.css('font-size', '11px');
    }
});

Get unique values from arraylist in java

    public static List getUniqueValues(List input) {
      return new ArrayList<>(new LinkedHashSet<>(incoming));
    }

dont forget to implement your equals method first

How do I access my webcam in Python?

John Montgomery's, answer is great, but at least on Windows, it is missing the line

vc.release()

before

cv2.destroyWindow("preview")

Without it, the camera resource is locked, and can not be captured again before the python console is killed.

How to calculate age (in years) based on Date of Birth and getDate()

EDIT: THIS ANSWER IS INCORRECT. I leave it in here as a warning to anyone tempted to use dayofyear, with a further edit at the end.

If, like me, you do not want to divide by fractional days or risk rounding/leap year errors, I applaud @Bacon Bits comment in a post above https://stackoverflow.com/a/1572257/489865 where he says:

If we're talking about human ages, you should calculate it the way humans calculate age. It has nothing to do with how fast the earth moves and everything to do with the calendar. Every time the same month and day elapses as the date of birth, you increment age by 1. This means the following is the most accurate because it mirrors what humans mean when they say "age".

He then offers:

DATEDIFF(yy, @date, GETDATE()) -
CASE WHEN (MONTH(@date) > MONTH(GETDATE())) OR (MONTH(@date) = MONTH(GETDATE()) AND DAY(@date) > DAY(GETDATE()))
THEN 1 ELSE 0 END

There are several suggestions here involving comparing the month & day (and some get it wrong, failing to allow for the OR as correctly here!). But nobody has offered dayofyear, which seems so simple and much shorter. I offer:

DATEDIFF(year, @date, GETDATE()) -
CASE WHEN DATEPART(dayofyear, @date) > DATEPART(dayofyear, GETDATE()) THEN 1 ELSE 0 END

[Note: Nowhere in SQL BOL/MSDN is what DATEPART(dayofyear, ...) returns actually documented! I understand it to be a number in the range 1--366; most importantly, it does not change by locale as per DATEPART(weekday, ...) & SET DATEFIRST.]

EDIT: Why dayofyear goes wrong: As user @AeroX has commented, if the birth/start date is after February in a non leap year, the age is incremented one day early when the current/end date is a leap year, e.g. '2015-05-26', '2016-05-25' gives an age of 1 when it should still be 0. Comparing the dayofyear in different years is clearly dangerous. So using MONTH() and DAY() is necessary after all.

auto refresh for every 5 mins

Page should be refresh auto using meta tag

<meta http-equiv="Refresh" content="60">

content value in seconds.after one minute page should be refresh

Cannot authenticate into mongo, "auth fails"

I also received this error, what I needed was to specify the database where the user authentication data was stored:

mongo -u admin -p SECRETPASSWORD --authenticationDatabase admin

Update Nov 18 2017:

mongo admin -u admin -p

is a better solution. Mongo will prompt you for your password, this way you won't put your cleartext password into the shell history which is just terrible security practice.

difference between primary key and unique key

For an organization or a business, there are so many physical entities (such as people, resources, machines, etc.) and virtual entities (their Tasks, transactions, activities). Typically, business needs to record and process information of those business entities. These business entities are identified within a whole business domain by a Key.

As per RDBMS prospective, Key (a.k.a Candidate Key) is a value or set of values that uniquely identifies an entity.

For a DB-Table, there are so many keys are exist and might be eligible for Primary Key. So that all keys, primary key, unique key, etc are collectively called as Candidate Key. However, DBA selected a key from candidate key for searching records is called Primary key.

Difference between Primary Key and Unique key

1. Behavior: Primary Key is used to identify a row (record) in a table, whereas Unique-key is to prevent duplicate values in a column (with the exception of a null entry).

2. Indexing: By default SQL-engine creates Clustered Index on primary-key if not exists and Non-Clustered Index on Unique-key.

3. Nullability: Primary key does not include Null values, whereas Unique-key can.

4. Existence: A table can have at most one primary key, but can have multiple Unique-key.

5. Modifiability: You can’t change or delete primary values, but Unique-key values can.

For more information and Examples:

http://dotnetauthorities.blogspot.in/2013/11/Microsoft-SQL-Server-Training-Online-Learning-Classes-Integrity-Constraints-PrimaryKey-Unique-Key_27.html

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

It's hard to tell for sure because you haven't included many details, but I think what is going on is that there are <% ... %> code blocks inside your Page.Header (which is referring to <head runat="server"> - possibly in a master page). Therefore, when you try to add an item to the Controls collection of that control, you get the error message in the title of this question.

If I'm right, then the workaround is to wrap a <asp:placeholder runat="server"> tag around the <% ... %> code block. This makes the code block a child of the Placeholder control, instead of being a direct child of the Page.Header control, but it doesn't change the rendered output at all. Now that the code block is not a direct child of Page.Header you can add things to the header's controls collection without error.

Again, there is a code block somewhere or you wouldn't be seeing this error. If it's not in your aspx page, then the first place I would look is the file referenced by the MasterPageFile attribute at the top of your aspx.

Why use deflate instead of gzip for text files served by Apache?

I think there's no big difference between deflate and gzip, because gzip basically is just a header wrapped around deflate (see RFCs 1951 and 1952).

Python group by

Do it in 2 steps. First, create a dictionary.

>>> input = [('11013331', 'KAT'), ('9085267', 'NOT'), ('5238761', 'ETH'), ('5349618', 'ETH'), ('11788544', 'NOT'), ('962142', 'ETH'), ('7795297', 'ETH'), ('7341464', 'ETH'), ('9843236', 'KAT'), ('5594916', 'ETH'), ('1550003', 'ETH')]
>>> from collections import defaultdict
>>> res = defaultdict(list)
>>> for v, k in input: res[k].append(v)
...

Then, convert that dictionary into the expected format.

>>> [{'type':k, 'items':v} for k,v in res.items()]
[{'items': ['9085267', '11788544'], 'type': 'NOT'}, {'items': ['5238761', '5349618', '962142', '7795297', '7341464', '5594916', '1550003'], 'type': 'ETH'}, {'items': ['11013331', '9843236'], 'type': 'KAT'}]

It is also possible with itertools.groupby but it requires the input to be sorted first.

>>> sorted_input = sorted(input, key=itemgetter(1))
>>> groups = groupby(sorted_input, key=itemgetter(1))
>>> [{'type':k, 'items':[x[0] for x in v]} for k, v in groups]
[{'items': ['5238761', '5349618', '962142', '7795297', '7341464', '5594916', '1550003'], 'type': 'ETH'}, {'items': ['11013331', '9843236'], 'type': 'KAT'}, {'items': ['9085267', '11788544'], 'type': 'NOT'}]

Note both of these do not respect the original order of the keys. You need an OrderedDict if you need to keep the order.

>>> from collections import OrderedDict
>>> res = OrderedDict()
>>> for v, k in input:
...   if k in res: res[k].append(v)
...   else: res[k] = [v]
... 
>>> [{'type':k, 'items':v} for k,v in res.items()]
[{'items': ['11013331', '9843236'], 'type': 'KAT'}, {'items': ['9085267', '11788544'], 'type': 'NOT'}, {'items': ['5238761', '5349618', '962142', '7795297', '7341464', '5594916', '1550003'], 'type': 'ETH'}]

in python how do I convert a single digit number into a double digits string?

>>> a=["%02d" % x for x in range(24)]
>>> a
['00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23']
>>>

It is that simple

List all employee's names and their managers by manager name using an inner join

There are three tables- Equities(coulmns: ID,ISIN) and Bond(coulmns: ID,ISIN). Third table Securities(coulmns: ID,ISIN) contains all data from Equities and Bond tables. Write SQL queries to validate below: (1) Securities table should contain all the data from Equities and Bonds tables. (2) Securities table should not contain any data other than present in Equities and Bonds tables

how to generate a unique token which expires after 24 hours?

This way a token will exist up-to 24 hours. here is the code to generate token which will valid up-to 24 Hours. this code we use but i did not compose it.

public static string GenerateToken()
{
    int month = DateTime.Now.Month;
    int day = DateTime.Now.Day;
    string token = ((day * 100 + month) * 700 + day * 13).ToString();
    return token;
}

list.clear() vs list = new ArrayList<Integer>();

It's hard to know without a benchmark, but if you have lots of items in your ArrayList and the average size is lower, it might be faster to make a new ArrayList.

http://www.docjar.com/html/api/java/util/ArrayList.java.html

public void clear() {
    modCount++;

    // Let gc do its work
    for (int i = 0; i < size; i++)
        elementData[i] = null;

    size = 0;
}

Entity Framework Provider type could not be loaded?

I had encountered exactly the same problem on my CI build server (running Bamboo), which doesn't install any Visual Studio IDE on it.

Without making any code changing for the build/test process (which I don't think is good solution), the best way is to copy the EntityFramework.SqlServer.dll and paste it to C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE. (where your mstest running)

Problem solved!

Cache busting via params

As others have said, cache busting with a query param is usually considered a Bad Idea (tm), and has been for a long time. It's better to reflect the version in the file name. Html5 Boilerplate recommends against using the query string, among others.

That said, of the recommendations I have seen which cited a source, all seem to take their wisdom from a 2008 article by Steve Souders. His conclusions are based on the behaviour of proxies at the time, and they may or may not be relevant these days. Still, in the absence of more current information, changing the file name is the safe option.

Programs & Examples On #Dataset designer

Makefile - missing separator

add elements to object array

How do I get the currently displayed fragment?

How can I expose more than 1 port with Docker?

Step1

Step2

Step3

What is a good game engine that uses Lua?

How to change dot size in gnuplot

ASP.NET jQuery Ajax Calling Code-Behind Method

How to export the Html Tables data into PDF using Jspdf

Writing numerical values on the plot with Matplotlib

merge two object arrays with Angular 2 and TypeScript?

Combine two pandas Data Frames (join on a common column)

Nodemailer with Gmail and NodeJS

ASP.NET set hiddenfield a value in Javascript

Checking for empty queryset in Django

How to right align widget in horizontal linear layout Android?

Program "make" not found in PATH

how to wait for first command to finish?

Running Python on Windows for Node.js dependencies

jquery (or pure js) simulate enter key pressed for testing

What is the best way to test for an empty string in Go?

How to run a specific Android app using Terminal?

Activating Anaconda Environment in VsCode

Adding rows to tbody of a table using jQuery

Regex to check whether a string contains only numbers

What is the difference between public, protected, package-private and private in Java?

Grep for beginning and end of line?

A server is already running. Check …/tmp/pids/server.pid. Exiting - rails

System.Runtime.InteropServices.COMException (0x800A03EC)

Display alert message and redirect after click on accept

Displaying standard DataTables in MVC

Is it possible to capture a Ctrl+C signal and run a cleanup function, in a "defer" fashion?

Swift performSelector:withObject:afterDelay: is unavailable

Add a new line to a text file in MS-DOS

How to name Dockerfiles

How do I make JavaScript beep?

ASP.NET MVC controller actions that return JSON or partial html

Enabling/Disabling Microsoft Virtual WiFi Miniport

Sending websocket ping/pong frame from browser

Difference between array_map, array_walk and array_filter

href="tel:" and mobile numbers

SELECT with a Replace()

getOutputStream() has already been called for this response

Convert HTML5 into standalone Android App

Get the date of next monday, tuesday, etc

PowerShell: Create Local User Account

How do I disable orientation change on Android?

What does .shape[] do in "for i in range(Y.shape[0])"?

Calculate difference between 2 date / times in Oracle SQL

How to find an available port?

IOException: read failed, socket might closed - Bluetooth on Android 4.3

Flask SQLAlchemy query, specify column names

Binding Listbox to List<object> in WinForms

How Can I Truncate A String In jQuery?

Is background-color:none valid CSS?

go to character in vim

How to keep the local file or the remote file during merge using Git and the command line?

Using git mergetool

Using simple git commands

Mocking Logger and LoggerFactory with PowerMock and Mockito

Comparing strings in C# with OR in an if statement

What is difference between XML Schema and DTD?

How can I calculate the number of years between two dates?

Reverse Contents in Array

How to write the code for the back button?

Remove spaces from std::string in C++

Generating random numbers with normal distribution in Excel

How do I connect to my existing Git repository using Visual Studio Code?

How to add manifest permission to an application?

How to deal with bad_alloc in C++?

What is the C++ Standard specified behavior of new in c++?

What is the new_handler and set_new_handler?

How to handle out of memory conditions in C++?

What does "./" (dot slash) refer to in terms of an HTML file path location?

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

Inserting Image Into BLOB Oracle 10g

Error CS2001: Source file '.cs' could not be found

What is the C++ Standard specified behavior of `new` in c++?

What is the `new_handler` and `set_new_handler`?