#Ckeditor | Programs & Examples on Ckeditor

how to add or embed CKEditor in php page

Alternately, it could also be done as:

<?php
    include("ckeditor/ckeditor.php");
    $CKeditor = new CKeditor();
    $CKeditor->BasePath = 'ckeditor/';
    $CKeditor->editor('editor1');
?>

Note that the last line is having 'editor1' as name, it could be changed as per your requirement.

CKEditor instance already exists

For ajax requests,

 for(k in CKEDITOR.instances){
    var instance = CKEDITOR.instances[k];
    instance.destroy()
 }
  CKEDITOR.replaceAll();

this snipped removes all instances from document. Then creates new instances.

How can you integrate a custom file browser/uploader with CKEditor?

I spent a while trying to figure this one out and here is what I did. I've broken it down very simply as that is what I needed.

Directly below your ckeditor text area, enter the upload file like this >>>>

<form action="welcomeeditupload.asp" method="post" name="deletechecked">
    <div align="center">
        <br />
        <br />
        <label></label>
        <textarea class="ckeditor" cols="80" id="editor1" name="editor1" rows="10"><%=(rslegschedule.Fields.Item("welcomevar").Value)%></textarea>
        <script type="text/javascript">
        //<![CDATA[
            CKEDITOR.replace( 'editor1',
            {
                filebrowserUploadUrl : 'updateimagedone.asp'
            });
        //]]>
        </script>
        <br />
        <br />
        <br />
        <input type="submit" value="Update">
    </div>
</form>

'and then add your upload file, here is mine which is written in ASP. If you're using PHP, etc. simply replace the ASP with your upload script but make sure the page outputs the same thing.

<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<%
    if Request("CKEditorFuncNum")=1 then
        Set Upload = Server.CreateObject("Persits.Upload")
        Upload.OverwriteFiles = False
        Upload.SetMaxSize 5000000, True
        Upload.CodePage = 65001

        On Error Resume Next
        Upload.Save "d:\hosting\belaullach\senate\legislation"

        Dim picture
        For Each File in Upload.Files
            Ext = UCase(Right(File.Path, 3))
            If Ext <> "JPG" Then
                    If Ext <> "BMP" Then
                    Response.Write "File " & File.Path & " is not a .jpg or .bmp file." & "<BR>"
                    Response.write "You can only upload .jpg or .bmp files." & "<BR>" & "<BR>"
                    End if
            Else
                File.SaveAs Server.MapPath(("/senate/legislation") & "/" & File.fileName)
                f1=File.fileName
            End If
        Next
    End if

    fnm="/senate/legislation/"&f1
    imgop = "<html><body><script type=""text/javascript"">window.parent.CKEDITOR.tools.callFunction('1','"&fnm&"');</script></body></html>;"
    'imgop="callFunction('1','"&fnm&"',"");"
    Response.write imgop
%>

How do I set a value in CKEditor with Javascript?

<textarea id="editor1" name="editor1">This is sample text</textarea>

<div id="trackingDiv" ></div>

<script type="text/javascript">
    CKEDITOR.replace( 'editor1' );

</script>

Let try this..

Update :

To set data :

Create instance First::

var editor = CKEDITOR.instances['editor1'];

Then,

editor.setData('your data');

editor.insertHtml('your html data');

editor.insertText('your text data');

And Retrieve data from your editor::

editor.getData();

If change the particular para HTML data in CKEditor.

var html = $(editor.editable.$);
$('#id_of_para',html).html('your html data');

These are the possible ways that I know in CKEditor

CKEditor automatically strips classes from div

If you use Drupal AND the module called "WYSIWYG" with the CKEditor library, then the following workaround could be a solution. For me it works like a charm. I use CKEditor 4.4.5 and WYSIWYG 2.2 in Drupal 7.33. I found this workaround here: https://www.drupal.org/node/1956778.

Here it is: I create a custom module and put the following code in the ".module" file:

<?php
/**
 * Implements hook_wysiwyg_editor_settings_alter().
 */
function MYMODULE_wysiwyg_editor_settings_alter(&$settings, $context) {
  if ($context['profile']->editor == 'ckeditor') {
    $settings['allowedContent'] = TRUE;
  }
}
?>

I hope this help other Drupal users.

Turn off enclosing <p> tags in CKEditor 3.0

MAKE THIS YOUR config.js file code

CKEDITOR.editorConfig = function( config ) {

   //   config.enterMode = 2; //disabled <p> completely
        config.enterMode = CKEDITOR.ENTER_BR; // pressing the ENTER KEY input <br/>
        config.shiftEnterMode = CKEDITOR.ENTER_P; //pressing the SHIFT + ENTER KEYS input <p>
        config.autoParagraph = false; // stops automatic insertion of <p> on focus
    };

How can I get the content of CKEditor using JQuery?

To get data of ckeditor, you need to get ckeditor instance

HTML code:

<textarea class="form-control" id="reply_mail_msg" name="message" rows="3" data-form-field="Message" placeholder="" autofocus="" style="display: none;"></textarea>

Javascript:

var ck_ed = CKEDITOR.instances.reply_mail_msg.getData();

CKEditor, Image Upload (filebrowserUploadUrl)

If you don't want to have to buy CKFinder, like I didn't want to buy CKFinder, then I wrote a very reliable uploader for CKEditor 4. It consists of a second form, placed immediately above your textarea form, and utilizes the iframe hack, which, in spite of its name, is seamless and unobtrusive.

After the image is successfully uploaded, it will appear in your CKEditor window, along with whatever content is already there.

editor.php (the form page):

<?php
set_time_limit ( 3600 )
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Content Editor</title>
<link href="jquery-ui-1.10.2/themes/vader/ui.dialog.css" rel="stylesheet" media="screen" id="dialog_ui" />
<link href="jquery-ui-1.10.2/themes/vader/jquery-ui.css" rel="stylesheet" media="screen" id="dialog_ui" />
<script src="jquery-ui-1.10.2/jquery-1.9.1.js"></script>
<script src="jquery-ui-1.10.2/jquery.form.js"></script>
<script src="jquery-ui-1.10.2/ui/jquery-ui.js"></script>
<script src="ckeditor/ckeditor.js"></script>
<script src="ckeditor/config.js"></script>
<script src="ckeditor/adapters/jquery.js"></script>
<script src="ckeditor/plugin2.js"></script>
<script type="text/javascript">
$(document).ready(function() {
    $('#editor').ckeditor({ height: 400, width:600});
});

function placePic(){

    function ImageExist(url){
       var img = new Image();
       img.src = url;
       return img.height != 0;
    }

var filename = document.forms['uploader']['uploadedfile'].value;
document.forms['uploader']['filename'].value = filename;
var url = 'http://www.mydomain.com/external/images/cms/'+filename;
document.getElementById('uploader').submit();
var string = CKEDITOR.instances.editor.getData();
var t = setInterval(function(){

            var exists = ImageExist(url);
            if(exists === true){
                    if(document.getElementById('loader')){
                        document.getElementById('loader').parentNode.removeChild(document.getElementById('loader'));
                    }
                    CKEDITOR.instances.editor.setData(string + "<img src=\""+url+"\" />");
                    clearInterval(t);
            }
            else{
                if(! document.getElementById("loader")){
                    var loader = document.createElement("div");
                    loader.setAttribute("id","loader");
                    loader.setAttribute("style","position:absolute;margin:-300px auto 0px 240px;width:113px;height:63px;text-align:center;z-index:10;");
                    document.getElementById('formBox').appendChild(loader);

                    var loaderGif = document.createElement("img");
                    loaderGif.setAttribute("id","loaderGif");
                    loaderGif.setAttribute("style","width:113px;height:63px;text-align:center;");
                    loaderGif.src = "external/images/cms/2dumbfish.gif";
                    document.getElementById('loader').appendChild(loaderGif);
                }
            }

            },100);
}

function loadContent(){
if(document.forms['editorform']['site'].value !== "" && document.forms['editorform']['page'].value !== ""){
    var site = document.forms['editorform']['site'].value;
    var page = document.forms['editorform']['page'].value;
    var url = site+"/"+page+".html";
    $.ajax({
        type: "GET",
        url: url,
        dataType: 'html',
        success: function (html) {
            CKEDITOR.instances.editor.setData(html);
        }
    });
}
}
</script>
<style>
button{
  width: 93px;
  height: 28px;
  border:none;
  padding: 0 4px 8px 0;
  font-weight:bold
}
#formBox{
    width:50%;
margin:10px auto 0px auto;
font-family:Tahoma, Geneva, sans-serif;
font-size:12px;
}
#field{
position:absolute;
top:10px;
margin-left:300px;
margin-bottom:20px;
}
#target{
position:absolute;
top:100px;
left:100px;
width:400px;
height:100px;
display:none;
}
.textField{
    padding-left: 1px;
border-style: solid;
border-color: black;
border-width: 1px;
font-family: helvetica, arial, sans serif;
padding-left: 1px;
}
#report{
float:left;
margin-left:20px;
margin-top:10px;
font-family: helvetica, arial, sans serif;
font-size:12px;
color:#900;
}
</style>
</head>

<body>
<?php
if(isset($_GET['r'])){ ?><div id="report">
<?php echo $_GET['r']; ?> is changed.
</div><?php
}
?>
<div id="formBox">
<form id="uploader" name="uploader" action="editaction.php"  method="post" target="target" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="50000000" />
<input type="hidden" name="filename" value="" />
Insert image:&nbsp;<input name="uploadedfile" type="file" class="textField" onchange="placePic();return false;" />&nbsp;&nbsp;
</form>

<form name="editorform" id="editorform" method="post" action="editaction.php" >
<div id="field" >Site:&nbsp;<select name="site"  class="textField" onchange="loadContent();return false;">
    <option value=""></option>
    <option value="scubatortuga">scubatortuga</option>
    <option value="drytortugascharters">drytortugascharters</option>
    <option value="keyscombo">keyscombo</option>
    <option value="keywesttreasurehunters">keywesttreasurehunters</option>
    <option value="spearfishkeywest">spearfishkeywest</option>
</select>
Page:&nbsp;<select name="page" class="textField" onchange="loadContent();return false;">
    <option value=""></option>
    <option value="one">1</option>
    <option value="two">2</option>
    <option value="three">3</option>
    <option value="four">4</option>
</select>
</div><br />
<textarea name="editor" id="editor"></textarea><br />
<input type="submit" name="submit" value="Submit" />
</form>
</div>
<iframe name="target" id="target"></iframe>
</body>
</html>

And here is the action page, editaction.php, which does the actual file upload:

<?php
//editaction.php

foreach($_POST as $k => $v){
    ${"$k"} = $v;
}
//fileuploader.php
if($_FILES){
  $target_path = "external/images/cms/";
  $target_path = $target_path . basename( $_FILES['uploadedfile']['name']); 
  if(! file_exists("$target_path$filename")){
    move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path);
  }
}
else{
    $string = stripslashes($editor);
    $filename = "$site/$page.html";
    $handle = fopen($filename,"w");
    fwrite($handle,$string,strlen($string));
    fclose($handle);
    header("location: editor.php?r=$filename");
}
?>

How to add a custom button to the toolbar that calls a JavaScript function?

In case anybody is interested, I wrote a solution for this using Prototype. In order to get the button to appear correctly, I had to specify extraPlugins: 'ajaxsave' from inside the CKEDITOR.replace() method call.

Here is the plugin.js:

CKEDITOR.plugins.add('ajaxsave',
{
    init: function(editor)
    {
    var pluginName = 'ajaxsave';

    editor.addCommand( pluginName,
    {
        exec : function( editor )
        {
            new Ajax.Request('ajaxsave.php',
            {
                method:     "POST",
                parameters: { filename: 'index.html', editor: editor.getData() },
                onFailure:  function() { ThrowError("Error: The server has returned an unknown error"); },
                on0:        function() { ThrowError('Error: The server is not responding. Please try again.'); },
                onSuccess:  function(transport) {

                    var resp = transport.responseText;

                    //Successful processing by ckprocess.php should return simply 'OK'. 
                    if(resp == "OK") {
                        //This is a custom function I wrote to display messages. Nicer than alert() 
                        ShowPageMessage('Changes have been saved successfully!');
                    } else {
                        ShowPageMessage(resp,'10');
                    }
                }
            });
        },

        canUndo : true
    });

    editor.ui.addButton('ajaxsave',
    {
        label: 'Save',
        command: pluginName,
        className : 'cke_button_save'
    });
    }
});

Getting the textarea value of a ckeditor textarea with javascript

At least as of CKEDITOR 4.4.5, you can set up a listener for every change to the editor's contents, rather than running a timer:

CKEDITOR.on("instanceCreated", function(event) {
    event.editor.on("change", function () {
        $("#trackingDiv").html(event.editor.getData());
    });
});

I realize this may be too late for the OP, and doesn't show as the correct answer or have any votes (yet), but I thought I'd update the post for future readers.

How to convert a data frame column to numeric type?

with hablar::convert

To easily convert multiple columns to different data types you can use hablar::convert. Simple syntax: df %>% convert(num(a)) converts the column a from df to numeric.

Detailed example

Lets convert all columns of mtcars to character.

df <- mtcars %>% mutate_all(as.character) %>% as_tibble()

> df
# A tibble: 32 x 11
   mpg   cyl   disp  hp    drat  wt    qsec  vs    am    gear  carb 
   <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr>
 1 21    6     160   110   3.9   2.62  16.46 0     1     4     4    
 2 21    6     160   110   3.9   2.875 17.02 0     1     4     4    
 3 22.8  4     108   93    3.85  2.32  18.61 1     1     4     1

With hablar::convert:

library(hablar)

# Convert columns to integer, numeric and factor
df %>% 
  convert(int(cyl, vs),
          num(disp:wt),
          fct(gear))

results in:

# A tibble: 32 x 11
   mpg     cyl  disp    hp  drat    wt qsec     vs am    gear  carb 
   <chr> <int> <dbl> <dbl> <dbl> <dbl> <chr> <int> <chr> <fct> <chr>
 1 21        6  160    110  3.9   2.62 16.46     0 1     4     4    
 2 21        6  160    110  3.9   2.88 17.02     0 1     4     4    
 3 22.8      4  108     93  3.85  2.32 18.61     1 1     4     1    
 4 21.4      6  258    110  3.08  3.22 19.44     1 0     3     1

_csv.Error: field larger than field limit (131072)

Sometimes, a row contain double quote column. When csv reader try read this row, not understood end of column and fire this raise. Solution is below:

reader = csv.reader(cf, quoting=csv.QUOTE_MINIMAL)

How can I align two divs horizontally?

<div>
<div style="float:left;width:45%;" >
    <span>source list</span>
    <select size="10">
        <option />
        <option />
        <option />
    </select>
</div>

<div style="float:right;width:45%;">
    <span>destination list</span>
    <select size="10">
        <option />
        <option />
        <option />
    </select>
</div>
<div style="clear:both; font-size:1px;"></div>
</div>

Clear must be used so as to prevent the float bug (height warping of outer Div).

style="clear:both; font-size:1px;

Qt c++ aggregate 'std::stringstream ss' has incomplete type and cannot be defined

Like it's written up there, you forget to type #include <sstream>

#include <sstream>
using namespace std;

QString Stats_Manager::convertInt(int num)
{
   stringstream ss;
   ss << num;
   return ss.str();
}

You can also use some other ways to convert int to string, like

char numstr[21]; // enough to hold all numbers up to 64-bits
sprintf(numstr, "%d", age);
result = name + numstr;

check this!

Getting value of HTML text input

Yes, you can use jQuery to make this done, the idea is

Use a hidden value in your form, and copy the value from external text box to this hidden value just before submitting the form.

<form name="input" action="handle_email.php" method="post">
  <input type="hidden" name="email" id="email" />
  <input type="submit" value="Submit" />
</form> 

<script>
   $("form").submit(function() {
     var emailFromOtherTextBox = $("#email_textbox").val();
     $("#email").val(emailFromOtherTextBox ); 
     return true;
  });
</script>

also see http://api.jquery.com/submit/

JavaScriptSerializer - JSON serialization of enum as string

Add the below to your global.asax for JSON serialization of c# enum as string

  HttpConfiguration config = GlobalConfiguration.Configuration;
            config.Formatters.JsonFormatter.SerializerSettings.Formatting =
                Newtonsoft.Json.Formatting.Indented;

            config.Formatters.JsonFormatter.SerializerSettings.Converters.Add
                (new Newtonsoft.Json.Converters.StringEnumConverter());

PHP Checking if the current date is before or after a set date

Use strtotime to convert any date to unix timestamp and compare.

Output data with no column headings using PowerShell

If you use "format-table" you can use -hidetableheaders

java SSL and cert keystore

Just a word of caution. If you are trying to open an existing JKS keystore in Java 9 onwards, you need to make sure you mention the following properties too with value as "JKS":

javax.net.ssl.keyStoreType
javax.net.ssl.trustStoreType

The reason being that the default keystore type as prescribed in java.security file has been changed to pkcs12 from jks from Java 9 onwards.

Dart: mapping a list (list.map)

I'm new to flutter. I found that one can also achieve it this way.

 tabs: [
    for (var title in movieTitles) Tab(text: title)
  ]

Note: It requires dart sdk version to be >= 2.3.0, see here

What is the difference between 'protected' and 'protected internal'?

This table shows the difference. protected internal is the same as protected, except it also allows access from other classes in the same assembly.

Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?

Link to the PEP discussing the new bool type in Python 2.3: http://www.python.org/dev/peps/pep-0285/.

When converting a bool to an int, the integer value is always 0 or 1, but when converting an int to a bool, the boolean value is True for all integers except 0.

>>> int(False)
0
>>> int(True)
1
>>> bool(5)
True
>>> bool(-5)
True
>>> bool(0)
False

INSTALL_FAILED_UPDATE_INCOMPATIBLE when I try to install compiled .apk on device

go to : your adb folder \sdk\platform-tools\
type cmd
type : adb remount on command window
adb shell
su
rm /system/app/YourApp.apk
Restart your device

How can I make a .NET Windows Forms application that only runs in the System Tray?

It is very friendly framework for Notification Area Application... it is enough to add NotificationIcon to base form and change auto-generated code to code below:

public partial class Form1 : Form
{
    private bool hidden = false;

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.ShowInTaskbar = false;
        //this.WindowState = FormWindowState.Minimized;
        this.Hide();
        hidden = true;
    }

    private void notifyIcon1_Click(object sender, EventArgs e)
    {
        if (hidden) // this.WindowState == FormWindowState.Minimized)
        {
            // this.WindowState = FormWindowState.Normal;
            this.Show();
            hidden = false;
        }
        else
        {
            // this.WindowState = FormWindowState.Minimized;
            this.Hide();
            hidden = true;
        }
    }
}

How to convert an ArrayList containing Integers to primitive int array?

If you are using java-8 there's also another way to do this.

int[] arr = list.stream().mapToInt(i -> i).toArray();

What it does is:

getting a Stream<Integer> from the list
obtaining an IntStream by mapping each element to itself (identity function), unboxing the int value hold by each Integer object (done automatically since Java 5)
getting the array of int by calling toArray

You could also explicitly call intValue via a method reference, i.e:

int[] arr = list.stream().mapToInt(Integer::intValue).toArray();

It's also worth mentioning that you could get a NullPointerException if you have any null reference in the list. This could be easily avoided by adding a filtering condition to the stream pipeline like this:

                       //.filter(Objects::nonNull) also works
int[] arr = list.stream().filter(i -> i != null).mapToInt(i -> i).toArray();

Example:

List<Integer> list = Arrays.asList(1, 2, 3, 4);
int[] arr = list.stream().mapToInt(i -> i).toArray(); //[1, 2, 3, 4]

list.set(1, null); //[1, null, 3, 4]
arr = list.stream().filter(i -> i != null).mapToInt(i -> i).toArray(); //[1, 3, 4]

Pythonically add header to a csv file

You just add one additional row before you execute the loop. This row contains your CSV file header name.

schema = ['a','b','c','b']
row = 4
generators = ['A','B','C','D']
with open('test.csv','wb') as csvfile:    
     writer = csv.writer(csvfile, delimiter=delimiter)
# Gives the header name row into csv
     writer.writerow([g for g in schema])   
#Data add in csv file       
     for x in xrange(rows):
         writer.writerow([g() for g in generators])

c++ integer->std::string conversion. Simple function?

Not really, in the standard. Some implementations have a nonstandard itoa() function, and you could look up Boost's lexical_cast, but if you stick to the standard it's pretty much a choice between stringstream and sprintf() (snprintf() if you've got it).

Composer Update Laravel

The following works for me:

composer update --no-scripts

Why would you use Expression<Func<T>> rather than Func<T>?

I'm adding an answer-for-noobs because these answers seemed over my head, until I realized how simple it is. Sometimes it's your expectation that it's complicated that makes you unable to 'wrap your head around it'.

I didn't need to understand the difference until I walked into a really annoying 'bug' trying to use LINQ-to-SQL generically:

public IEnumerable<T> Get(Func<T, bool> conditionLambda){
  using(var db = new DbContext()){
    return db.Set<T>.Where(conditionLambda);
  }
}

This worked great until I started getting OutofMemoryExceptions on larger datasets. Setting breakpoints inside the lambda made me realize that it was iterating through each row in my table one-by-one looking for matches to my lambda condition. This stumped me for a while, because why the heck is it treating my data table as a giant IEnumerable instead of doing LINQ-to-SQL like it's supposed to? It was also doing the exact same thing in my LINQ-to-MongoDb counterpart.

The fix was simply to turn Func<T, bool> into Expression<Func<T, bool>>, so I googled why it needs an Expression instead of Func, ending up here.

An expression simply turns a delegate into a data about itself. So a => a + 1 becomes something like "On the left side there's an int a. On the right side you add 1 to it." That's it. You can go home now. It's obviously more structured than that, but that's essentially all an expression tree really is--nothing to wrap your head around.

Understanding that, it becomes clear why LINQ-to-SQL needs an Expression, and a Func isn't adequate. Func doesn't carry with it a way to get into itself, to see the nitty-gritty of how to translate it into a SQL/MongoDb/other query. You can't see whether it's doing addition or multiplication or subtraction. All you can do is run it. Expression, on the other hand, allows you to look inside the delegate and see everything it wants to do. This empowers you to translate the delegate into whatever you want, like a SQL query. Func didn't work because my DbContext was blind to the contents of the lambda expression. Because of this, it couldn't turn the lambda expression into SQL; however, it did the next best thing and iterated that conditional through each row in my table.

Edit: expounding on my last sentence at John Peter's request:

IQueryable extends IEnumerable, so IEnumerable's methods like Where() obtain overloads that accept Expression. When you pass an Expression to that, you keep an IQueryable as a result, but when you pass a Func, you're falling back on the base IEnumerable and you'll get an IEnumerable as a result. In other words, without noticing you've turned your dataset into a list to be iterated as opposed to something to query. It's hard to notice a difference until you really look under the hood at the signatures.

How can I access localhost from another computer in the same network?

You need to find what your local network's IP of that computer is. Then other people can access to your site by that IP.

You can find your local network's IP by go to Command Prompt or press Windows + R then type in ipconfig. It will give out some information and your local IP should look like 192.168.1.x.

How to compare two columns in Excel (from different sheets) and copy values from a corresponding column if the first two columns match?

Try:

sheet 2 a1 =vlookup(sheet2a1,sheet1$a$1:$b$6,2)

Then drag it down.

It should work.

How to install Java 8 on Mac

It seems that nobody has mentioned SDK man (https://sdkman.io/) yet.

SKD man allows installing multiple versions of Java on Mac and easy switching between these versions. More information is available at https://sdkman.io/usage.

For example:

$ sdk list java                                                                                                                                                                                                                       
================================================================================
Available Java Versions
================================================================================
   * 12.ea.20-open
     11.0.1-zulu
 > * 11.0.1-open
     10.0.2-zulu
     10.0.2-open
     9.0.7-zulu
     9.0.4-open
     8.0.192-zulu
     8.0.191-oracle
   + 8.0.181-oracle
     7.0.181-zulu
     1.0.0-rc-10-grl
     1.0.0-rc-9-grl
     1.0.0-rc-8-grl


================================================================================
+ - local version
* - installed
> - currently in use
================================================================================

$ sdk install java 8.0.191-oracle

$ sdk use java 8.0.191-oracle

Using java version 8.0.191-oracle in this shell.                                                                                                                                                                                                      

$ java -version                                                                                                                                                                                                                        
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

$ sdk use java 11.0.1-open                                           

Using java version 11.0.1-open in this shell.

$ java -version                                                                                                                                                                                                                        openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)
                                                                                                                                                                                                         ```

Add tooltip to font awesome icon

The simplest solution I have found is to wrap your Font Awesome Icon in an <a></a> tag:

   <Tooltip title="Node.js" >
     <a>
        <FontAwesomeIcon icon={faNode} size="2x" />
     </a>
   </Tooltip>

Installing a local module using npm?

you just provide one <folder> argument to npm install, argument should point toward the local folder instead of the package name:

npm install /path

Row count on the Filtered data

While I agree with the results given, they didn't work for me. If your Table has a name this will work:

Public Sub GetCountOfResults(WorkSheetName As String, TableName As String)
    Dim rnData As Range
    Dim rngArea As Range
    Dim lCount As Long
        Set rnData = ThisWorkbook.Worksheets(WorkSheetName).ListObjects(TableName).Range
    With rnData
        For Each rngArea In .SpecialCells(xlCellTypeVisible).Areas
            lCount = lCount + rngArea.Rows.Count
        Next
        MsgBox "Autofilter " & lCount - 1 & " records"
    End With
    Set rnData = Nothing
    lCount = Empty      
End Sub

This is modified to work with ListObjects from an original version I found here:

http://www.ozgrid.com/forum/showthread.php?t=81858

Invoke-Command error "Parameter set cannot be resolved using the specified named parameters"

Fairly new to using PowerShell, think I might be able to help. Could you try this?

I believe you're not getting the correct parameters to your script block:

param([string]$one, [string]$two)
$res = Invoke-Command -Credential $migratorCreds -ScriptBlock {Get-LocalUsers -parentNodeXML $args[0] -migratorUser $args[1] } -ArgumentList $xmlPRE, $migratorCreds

AngularJs .$setPristine to reset form

$setPristine() was introduced in the 1.1.x branch of angularjs. You need to use that version rather than 1.0.7 in order for it to work.

See http://plnkr.co/edit/815Bml?p=preview

How do I print the type or class of a variable in Swift?

let i: Int = 20


  func getTypeName(v: Any) -> String {
    let fullName = _stdlib_demangleName(_stdlib_getTypeName(i))
    if let range = fullName.rangeOfString(".") {
        return fullName.substringFromIndex(range.endIndex)
    }
    return fullName
}

println("Var type is \(getTypeName(i)) = \(i)")

json_decode() expects parameter 1 to be string, array given

Make an object

$obj = json_decode(json_encode($need_to_json));
Show data from this $obj

$obj->{'needed'};

Reference

how to get the base url in javascript

Base URL in JavaScript

Here is simple function for your project to get base URL in JavaScript.

// base url
function base_url() {
    var pathparts = location.pathname.split('/');
    if (location.host == 'localhost') {
        var url = location.origin+'/'+pathparts[1].trim('/')+'/'; // http://localhost/myproject/
    }else{
        var url = location.origin; // http://stackoverflow.com
    }
    return url;
}

Getting results between two dates in PostgreSQL

To have a query working in any locale settings, consider formatting the date yourself:

SELECT * 
  FROM testbed 
 WHERE start_date >= to_date('2012-01-01','YYYY-MM-DD')
   AND end_date <= to_date('2012-04-13','YYYY-MM-DD');

iPhone App Development on Ubuntu

There are two things I think you could try to develop iPhone applications.

You can try the Aptana mobile wep app plugin for eclipse which is nice, although still in early stage. It comes with a emulator for running the applications so this could be helpful
You can try cocoa
(Extra) Here is a nice guide I found of guy who managed to get the iPhone SDK running in ubuntu, hope this help -_-. iPhone on Ubuntu

How do you easily horizontally center a <div> using CSS?

After nine years I thought it was time to bring a new version. Here are my two (and now one) favourites.

Margin

Set margin to auto. You should know the direction sequence is margin: *top* *right* *bottom* *left*; or margin: *top&bottom* *left&right*

_x000D_

aside{_x000D_
    display: block;_x000D_
    width: 50px;_x000D_
    height: 100px;_x000D_
    background-color: green;_x000D_
    float: left;_x000D_
}_x000D_
_x000D_
article{_x000D_
    height: 100px;_x000D_
    margin: 0 0 0 50px; /* 50px aside width */_x000D_
    background-color: grey;_x000D_
}_x000D_
_x000D_
div{_x000D_
  margin: 0 auto;_x000D_
  display:block;_x000D_
  width: 60px;_x000D_
  height: 60px;_x000D_
  background-color: blue;_x000D_
  color: white;_x000D_
}

_x000D_

<!DOCTYPE html>_x000D_
<html>_x000D_
    <head>_x000D_
    </head>_x000D_
    <body>_x000D_
        <aside>_x000D_
        </aside>_x000D_
        <article>           _x000D_
                <div>The div</div>_x000D_
        </article>_x000D_
    </body>_x000D_
</html>

_x000D_

Center: Depricated, don't use this!

Use <center></center> tags as a wrap around your <div></div>.

Example:

_x000D_

aside{_x000D_
    display:block;_x000D_
    background-color:green;_x000D_
    width: 50px;_x000D_
    height: 100px;_x000D_
    float: left;_x000D_
}_x000D_
_x000D_
center{_x000D_
    display:block;_x000D_
    background-color:grey;_x000D_
    height: 100px;_x000D_
    margin-left: 50px; /* Width of the aside */_x000D_
}_x000D_
_x000D_
div{_x000D_
    display:block; _x000D_
    width: 60px; _x000D_
    height: 60px; _x000D_
    background-color:blue;_x000D_
    color: white;_x000D_
}

_x000D_

<!DOCTYPE html>_x000D_
<html>_x000D_
    <head>_x000D_
    </head>_x000D_
    <body>_x000D_
        <aside>_x000D_
        </aside>_x000D_
        <article>_x000D_
            <center>_x000D_
                <div>The div</div>_x000D_
            </center>_x000D_
        </article>_x000D_
    </body>_x000D_
</html>

_x000D_

How do I refresh a DIV content?

To reload a section of the page, you could use jquerys load with the current url and specify the fragment you need, which would be the same element that load is called on, in this case #here:

function updateDiv()
{ 
    $( "#here" ).load(window.location.href + " #here" );
}

Don't disregard the space within the load element selector: + " #here"

This function can be called within an interval, or attached to a click event

Python: Converting from ISO-8859-1/latin1 to UTF-8

This is a common problem, so here's a relatively thorough illustration.

For non-unicode strings (i.e. those without u prefix like u'\xc4pple'), one must decode from the native encoding (iso8859-1/latin1, unless modified with the enigmatic sys.setdefaultencoding function) to unicode, then encode to a character set that can display the characters you wish, in this case I'd recommend UTF-8.

First, here is a handy utility function that'll help illuminate the patterns of Python 2.7 string and unicode:

>>> def tell_me_about(s): return (type(s), s)

A plain string

>>> v = "\xC4pple" # iso-8859-1 aka latin1 encoded string

>>> tell_me_about(v)
(<type 'str'>, '\xc4pple')

>>> v
'\xc4pple'        # representation in memory

>>> print v
?pple             # map the iso-8859-1 in-memory to iso-8859-1 chars
                  # note that '\xc4' has no representation in iso-8859-1, 
                  # so is printed as "?".

Decoding a iso8859-1 string - convert plain string to unicode

>>> uv = v.decode("iso-8859-1")
>>> uv
u'\xc4pple'       # decoding iso-8859-1 becomes unicode, in memory

>>> tell_me_about(uv)
(<type 'unicode'>, u'\xc4pple')

>>> print v.decode("iso-8859-1")
Äpple             # convert unicode to the default character set
                  # (utf-8, based on sys.stdout.encoding)

>>> v.decode('iso-8859-1') == u'\xc4pple'
True              # one could have just used a unicode representation 
                  # from the start

A little more illustration — with “Ä”

>>> u"Ä" == u"\xc4"
True              # the native unicode char and escaped versions are the same

>>> "Ä" == u"\xc4"  
False             # the native unicode char is '\xc3\x84' in latin1

>>> "Ä".decode('utf8') == u"\xc4"
True              # one can decode the string to get unicode

>>> "Ä" == "\xc4"
False             # the native character and the escaped string are
                  # of course not equal ('\xc3\x84' != '\xc4').

Encoding to UTF

>>> u8 = v.decode("iso-8859-1").encode("utf-8")
>>> u8
'\xc3\x84pple'    # convert iso-8859-1 to unicode to utf-8

>>> tell_me_about(u8)
(<type 'str'>, '\xc3\x84pple')

>>> u16 = v.decode('iso-8859-1').encode('utf-16')
>>> tell_me_about(u16)
(<type 'str'>, '\xff\xfe\xc4\x00p\x00p\x00l\x00e\x00')

>>> tell_me_about(u8.decode('utf8'))
(<type 'unicode'>, u'\xc4pple')

>>> tell_me_about(u16.decode('utf16'))
(<type 'unicode'>, u'\xc4pple')

Relationship between unicode and UTF and latin1

>>> print u8
Äpple             # printing utf-8 - because of the encoding we now know
                  # how to print the characters

>>> print u8.decode('utf-8') # printing unicode
Äpple

>>> print u16     # printing 'bytes' of u16
???pple

>>> print u16.decode('utf16')
Äpple             # printing unicode

>>> v == u8
False             # v is a iso8859-1 string; u8 is a utf-8 string

>>> v.decode('iso8859-1') == u8
False             # v.decode(...) returns unicode

>>> u8.decode('utf-8') == v.decode('latin1') == u16.decode('utf-16')
True              # all decode to the same unicode memory representation
                  # (latin1 is iso-8859-1)

Unicode Exceptions

 >>> u8.encode('iso8859-1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0:
  ordinal not in range(128)

>>> u16.encode('iso8859-1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0:
  ordinal not in range(128)

>>> v.encode('iso8859-1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 0:
  ordinal not in range(128)

One would get around these by converting from the specific encoding (latin-1, utf8, utf16) to unicode e.g. u8.decode('utf8').encode('latin1').

So perhaps one could draw the following principles and generalizations:

a type str is a set of bytes, which may have one of a number of encodings such as Latin-1, UTF-8, and UTF-16
a type unicode is a set of bytes that can be converted to any number of encodings, most commonly UTF-8 and latin-1 (iso8859-1)
the print command has its own logic for encoding, set to sys.stdout.encoding and defaulting to UTF-8
One must decode a str to unicode before converting to another encoding.

Of course, all of this changes in Python 3.x.

Hope that is illuminating.

psql: FATAL: database "<user>" does not exist

First off, it's helpful to create a database named the same as your current use, to prevent the error when you just want to use the default database and create new tables without declaring the name of a db explicitly.

Replace "skynotify" with your username:

psql -d postgres -c "CREATE DATABASE skynotify ENCODING 'UTF-8';"

-d explicitly declares which database to use as the default for SQL statements that don't explicitly include a db name during this interactive session.

BASICS FOR GETTING A CLEAR PICTURE OF WHAT YOUR PostgresQL SERVER has in it.

You must connect to an existing database to use psql interactively. Fortunately, you can ask psql for a list of databases:

psql -l

                                          List of databases
               Name               | Owner  | Encoding |   Collate   |    Ctype    | Access privileges 
----------------------------------+-----------+----------+-------------+-------------+-------------------
 skynotify                        | skynotify | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 myapp_dev                        | skynotify | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 postgres                         | skynotify | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 ruby-getting-started_development | skynotify | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 template0                        | skynotify | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/skynotify          +
                                  |           |          |             |             | skynotify=CTc/skynotify
 template1                        | skynotify | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/skynotify          +
                                  |           |          |             |             | skynotify=CTc/skynotify
(6 rows)

This does NOT start the interactive console, it just outputs a text based table to the terminal.

As another answers says, postgres is always created, so you should use it as your failsafe database when you just want to get the console started to work on other databases. If it isn't there, then list the databases and then use any one of them.

In a similar fashion, select tables from a database:

psql -d postgres -c "\dt;"

My "postgres" database has no tables, but any database that does will output a text based table to the terminal (standard out).

And for completeness, we can select all rows from a table too:

psql -d ruby-getting-started_development -c "SELECT * FROM widgets;"

 id | name | description | stock | created_at | updated_at 
----+------+-------------+-------+------------+------------
(0 rows)

Even if there are zero rows returned, you'll get the field names.

If your tables have more than a dozen rows, or you're not sure, it'll be more useful to start with a count of rows to understand how much data is in your database:

 psql -d ruby-getting-started_development -c "SELECT count(*) FROM widgets;"

 count 
-------
     0
(1 row)

And don't that that "1 row" confuse you, it just represents how many rows are returned by the query, but the 1 row contains the count you want, which is 0 in this example.

NOTE: a db created without an owner defined will be owned by the current user.

Convert ascii char[] to hexadecimal char[] in C

Use the %02X format parameter:

printf("%02X",word[i]);

More info can be found here: http://www.cplusplus.com/reference/cstdio/printf/

Oracle - How to create a materialized view with FAST REFRESH and JOINS

Have you tried it without the ANSI join ?

CREATE MATERIALIZED VIEW MV_Test
  NOLOGGING
  CACHE
  BUILD IMMEDIATE 
  REFRESH FAST ON COMMIT 
  AS
SELECT V.*, P.* FROM TPM_PROJECTVERSION V,TPM_PROJECT P 
WHERE  P.PROJECTID = V.PROJECTID

How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searched for?)

In addition to the locations listed above, the OS X version of Perl also has two more ways:

The /Library/Perl/x.xx/AppendToPath file. Paths listed in this file are appended to @INC at runtime.
The /Library/Perl/x.xx/PrependToPath file. Paths listed in this file are prepended to @INC at runtime.

JOIN two SELECT statement results

If Age and Palt are columns in the same Table, you can count(*) all tasks and sum only late ones like this:

select ks,
       count(*) tasks,
       sum(case when Age > Palt then 1 end) late
  from Table
 group by ks

How to select only date from a DATETIME field in MySQL?

SELECT DATE_FORMAT(NOW() - INTERVAL FLOOR(RAND() * 14) DAY,'%Y-%m-%d');

This one can be used to get date in 'yyyy-mm-dd' format.

List directory tree structure in python?

import os

def fs_tree_to_dict(path_):
    file_token = ''
    for root, dirs, files in os.walk(path_):
        tree = {d: fs_tree_to_dict(os.path.join(root, d)) for d in dirs}
        tree.update({f: file_token for f in files})
        return tree  # note we discontinue iteration trough os.walk

If anybody is interested - that recursive function returns nested structure of dictionaries. Keys are file system names (of directories and files), values are either:

sub dictionaries for directories
strings for files (see file_token)

The strings designating files are empty in this example. They can also be e.g. given file contents or its owner info or privileges or whatever object different than a dict. Unless it's a dictionary it can be easily distinguished from a "directory type" in further operations.

Having such a tree in a filesystem:

# bash:
$ tree /tmp/ex
/tmp/ex
+-- d_a
¦   +-- d_a_a
¦   +-- d_a_b
¦   ¦   +-- f1.txt
¦   +-- d_a_c
¦   +-- fa.txt
+-- d_b
¦   +-- fb1.txt
¦   +-- fb2.txt
+-- d_c

The result will be:

# python 2 or 3:
>>> fs_tree_to_dict("/tmp/ex")
{
    'd_a': {
        'd_a_a': {},
        'd_a_b': {
            'f1.txt': ''
        },
        'd_a_c': {},
        'fa.txt': ''
    },
    'd_b': {
        'fb1.txt': '',
        'fb2.txt': ''
    },
    'd_c': {}
}

If you like that, I've already created a package (python 2 & 3) with this stuff (and a nice pyfakefs helper): https://pypi.org/project/fsforge/

Why can templates only be implemented in the header file?

It means that the most portable way to define method implementations of template classes is to define them inside the template class definition.

template < typename ... >
class MyClass
{

    int myMethod()
    {
       // Not just declaration. Add method implementation here
    }
};

Cannot create Maven Project in eclipse

Just delete the ${user.home}/.m2/repository/org/apache/maven/archetypes to refresh all files needed, it worked fine to me!

How to add a named sheet at the end of all Excel sheets?

Try this:

Private Sub CreateSheet()
    Dim ws As Worksheet
    Set ws = ThisWorkbook.Sheets.Add(After:= _
             ThisWorkbook.Sheets(ThisWorkbook.Sheets.Count))
    ws.Name = "Tempo"
End Sub

Or use a With clause to avoid repeatedly calling out your object

Private Sub CreateSheet()
    Dim ws As Worksheet
    With ThisWorkbook
        Set ws = .Sheets.Add(After:=.Sheets(.Sheets.Count))
        ws.Name = "Tempo"
    End With
End Sub

Above can be further simplified if you don't need to call out on the same worksheet in the rest of the code.

Sub CreateSheet()
    With ThisWorkbook
        .Sheets.Add(After:=.Sheets(.Sheets.Count)).Name = "Temp"
    End With
End Sub

How to save a new sheet in an existing excel file, using Pandas?

You can read existing sheets of your interests, for example, 'x1', 'x2', into memory and 'write' them back prior to adding more new sheets (keep in mind that sheets in a file and sheets in memory are two different things, if you don't read them, they will be lost). This approach uses 'xlsxwriter' only, no openpyxl involved.

import pandas as pd
import numpy as np

path = r"C:\Users\fedel\Desktop\excelData\PhD_data.xlsx"

# begin <== read selected sheets and write them back
df1 = pd.read_excel(path, sheet_name='x1', index_col=0) # or sheet_name=0
df2 = pd.read_excel(path, sheet_name='x2', index_col=0) # or sheet_name=1
writer = pd.ExcelWriter(path, engine='xlsxwriter')
df1.to_excel(writer, sheet_name='x1')
df2.to_excel(writer, sheet_name='x2')
# end ==>

# now create more new sheets
x3 = np.random.randn(100, 2)
df3 = pd.DataFrame(x3)

x4 = np.random.randn(100, 2)
df4 = pd.DataFrame(x4)

df3.to_excel(writer, sheet_name='x3')
df4.to_excel(writer, sheet_name='x4')
writer.save()
writer.close()

If you want to preserve all existing sheets, you can replace above code between begin and end with:

# read all existing sheets and write them back
writer = pd.ExcelWriter(path, engine='xlsxwriter')
xlsx = pd.ExcelFile(path)
for sheet in xlsx.sheet_names:
    df = xlsx.parse(sheet_name=sheet, index_col=0)
    df.to_excel(writer, sheet_name=sheet)

How to use Select2 with JSON via Ajax request?

for select2 v4.0.0 slightly different

$(".itemSearch").select2({
    tags: true,
    multiple: true,
    tokenSeparators: [',', ' '],
    minimumInputLength: 2,
    minimumResultsForSearch: 10,
    ajax: {
        url: URL,
        dataType: "json",
        type: "GET",
        data: function (params) {

            var queryParameters = {
                term: params.term
            }
            return queryParameters;
        },
        processResults: function (data) {
            return {
                results: $.map(data, function (item) {
                    return {
                        text: item.tag_value,
                        id: item.tag_id
                    }
                })
            };
        }
    }
});

How do I link object files in C? Fails with "Undefined symbols for architecture x86_64"

I assume you are using gcc, to simply link object files do:

$ gcc -o output file1.o file2.o

To get the object-files simply compile using

$ gcc -c file1.c

this yields file1.o and so on.

If you want to link your files to an executable do

$ gcc -o output file1.c file2.c

How to remove/delete a large file from commit history in Git repository?

Just note that this commands can be very destructive. If more people are working on the repo they'll all have to pull the new tree. The three middle commands are not necessary if your goal is NOT to reduce the size. Because the filter branch creates a backup of the removed file and it can stay there for a long time.

$ git filter-branch --index-filter "git rm -rf --cached --ignore-unmatch YOURFILENAME" HEAD
$ rm -rf .git/refs/original/ 
$ git reflog expire --all 
$ git gc --aggressive --prune
$ git push origin master --force

Is there a shortcut to make a block comment in Xcode?

Seems like already a lot of people answers this question.

in Swift 3.0, single line comment is to put double forward slashes upfront : "//" ; multiline is put "/* .... */".

Hope this helps.

Sort a list of Class Instances Python

import operator
sorted_x = sorted(x, key=operator.attrgetter('score'))

if you want to sort x in-place, you can also:

x.sort(key=operator.attrgetter('score'))

Output data from all columns in a dataframe in pandas

I know this is an old question, but I have just had a similar problem and I think what I did would work for you too.

I used the to_csv() method and wrote to stdout:

import sys

paramdata.to_csv(sys.stdout)

This should dump the whole dataframe whether it's nicely-printable or not, and you can use the to_csv parameters to configure column separators, whether the index is printed, etc.

Edit: It is now possible to use None as the target for .to_csv() with similar effect, which is arguably a lot nicer:

paramdata.to_csv(None)

Python foreach equivalent

For an updated answer you can build a forEach function in Python easily:

def forEach(list, function):
    for i, v in enumerate(list):
        function(v, i, list)

You could also adapt this to map, reduce, filter, and any other array functions from other languages or precedence you'd want to bring over. For loops are fast enough, but the boiler plate is longer than forEach or the other functions. You could also extend list to have these functions with a local pointer to a class so you could call them directly on lists as well.

Install specific version using laravel installer

For newer version of laravel:

composer create-project --prefer-dist laravel/laravel=5.5.* project_name

How to fix Invalid byte 1 of 1-byte UTF-8 sequence

I had the same problem in my JSF application which was having a comment line containing some special characters in the XMHTL page. When I compared the previous version in my eclipse it had a comment,

//Some ? ? special characters found

Removed those characters and the page loaded fine. Mostly it is related to XML files, so please compare it with the working version.

Uncaught SyntaxError: Unexpected token :

It sounds like your response is being evaluated somehow. This gives the same error in Chrome:

var resp = '{"votes":47,"totalvotes":90}';
eval(resp);

This is due to the braces '{...}' being interpreted by javascript as a code block and not an object literal as one might expect.

I would look at the JSON.decode() function and see if there is an eval in there.

Similar issue here: Eval() = Unexpected token : error

Get latitude and longitude based on location name with Google Autocomplete API

http://maps.googleapis.com/maps/api/geocode/OUTPUT?address=YOUR_LOCATION&sensor=true

OUTPUT = json or xml;

for detail information about google map api go through url:

http://code.google.com/apis/maps/documentation/geocoding/index.html

Hope this will help

C: socket connection timeout

This one has parametrized ip, port, timeout in seconds, handle connection errors and give you connection time in milliseconds:

#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>

int main(int argc, char **argv) {
    struct sockaddr_in addr_s;
    char *addr;
    short int fd=-1;
    int port;
    fd_set fdset;
    struct timeval tv;
    int rc;
    int so_error;
    socklen_t len;
    struct timespec tstart={0,0}, tend={0,0};
    int seconds;

    if (argc != 4) {
        fprintf(stderr, "Usage: %s <ip> <port> <timeout_seconds>\n", argv[0]);
        return 1;
    }

    addr = argv[1];
    port = atoi(argv[2]);
    seconds = atoi(argv[3]);

    addr_s.sin_family = AF_INET; // utilizzo IPv4
    addr_s.sin_addr.s_addr = inet_addr(addr);
    addr_s.sin_port = htons(port);

    clock_gettime(CLOCK_MONOTONIC, &tstart);

    fd = socket(AF_INET, SOCK_STREAM, 0);
    fcntl(fd, F_SETFL, O_NONBLOCK); // setup non blocking socket

    // make the connection
    rc = connect(fd, (struct sockaddr *)&addr_s, sizeof(addr_s));
    if ((rc == -1) && (errno != EINPROGRESS)) {
        fprintf(stderr, "Error: %s\n", strerror(errno));
        close(fd);
        return 1;
    }
    if (rc == 0) {
        // connection has succeeded immediately
        clock_gettime(CLOCK_MONOTONIC, &tend);
        printf("socket %s:%d connected. It took %.5f seconds\n",
            addr, port, (((double)tend.tv_sec + 1.0e-9*tend.tv_nsec) - ((double)tstart.tv_sec + 1.0e-9*tstart.tv_nsec)));

        close(fd);
        return 0;
    } /*else {
        // connection attempt is in progress
    } */

    FD_ZERO(&fdset);
    FD_SET(fd, &fdset);
    tv.tv_sec = seconds;
    tv.tv_usec = 0;

    rc = select(fd + 1, NULL, &fdset, NULL, &tv);
    switch(rc) {
    case 1: // data to read
        len = sizeof(so_error);

        getsockopt(fd, SOL_SOCKET, SO_ERROR, &so_error, &len);

        if (so_error == 0) {
            clock_gettime(CLOCK_MONOTONIC, &tend);
            printf("socket %s:%d connected. It took %.5f seconds\n",
                addr, port, (((double)tend.tv_sec + 1.0e-9*tend.tv_nsec) - ((double)tstart.tv_sec + 1.0e-9*tstart.tv_nsec)));
            close(fd);
            return 0;
        } else { // error
            printf("socket %s:%d NOT connected: %s\n", addr, port, strerror(so_error));
        }
        break;
    case 0: //timeout
        fprintf(stderr, "connection timeout trying to connect to %s:%d\n", addr, port);
        break;
    }

    close(fd);
    return 0;
}

How to create and use temporary table in oracle stored procedure?

How do I set a textbox's value using an anchor with jQuery?

Following redsquare: You should not use in href attribute javascript code like "javascript:void();" - it is wrong. Better use for example href="#" and then in Your event handler as a last command: "return false;". And even better - use in href correct link - if user have javascript disabled, web browser follows the link - in this case Your webpage should reload with input filled with value of that link.

When should the xlsm or xlsb formats be used?

They're all similar in that they're essentially zip files containing the actual file components. You can see the contents just by replacing the extension with .zip and opening them up. The difference with xlsb seems to be that the components are not XML-based but are in a binary format: supposedly this is beneficial when working with large files.

https://blogs.msdn.microsoft.com/dmahugh/2006/08/22/new-binary-file-format-for-spreadsheets/

How to convert JSON data into a Python object

The answers given here does not return the correct object type, hence I created these methods below. They also fail if you try to add more fields to the class that does not exist in the given JSON:

def dict_to_class(class_name: Any, dictionary: dict) -> Any:
    instance = class_name()
    for key in dictionary.keys():
        setattr(instance, key, dictionary[key])
    return instance


def json_to_class(class_name: Any, json_string: str) -> Any:
    dict_object = json.loads(json_string)
    return dict_to_class(class_name, dict_object)

How to clear form after submit in Angular 2?

To angular version 4, you can use this:

this.heroForm.reset();

But, you could need a initial value like:

ngOnChanges() {
 this.heroForm.reset({
  name: this.hero.name, //Or '' to empty initial value. 
  address: this.hero.addresses[0] || new Address()
 });
}

It is important to resolve null problem in your object reference.

reference link, Search for "reset the form flags".

How do I edit an incorrect commit message in git ( that I've pushed )?

At our shop, I introduced the convention of adding recognizably named annotated tags to commits with incorrect messages, and using the annotation as the replacement.

Even though this doesn't help folks who run casual "git log" commands, it does provide us with a way to fix incorrect bug tracker references in the comments, and all my build and release tools understand the convention.

This is obviously not a generic answer, but it might be something folks can adopt within specific communities. I'm sure if this is used on a larger scale, some sort of porcelain support for it may crop up, eventually...

Java Multithreading concept and join() method

First of all, when you create ob1 then constructor is called and it starts execution. At that time t.start() also runs in separate thread. Remember when a new thread is created, it runs parallely to main thread. And thats why main start execution again with next statement.

And Join() statement is used to prevent the child thread from becoming orphan. Means if you did'nt call join() in your main class, then main thread will exit after its execution and child thread will be still there executing the statements. Join() will wait until all child thread complete its execution and then only main method will exit.

Go through this article, helps a lot.

JavaScript: Is there a way to get Chrome to break on all errors?

Unfortunately, it the Developer Tools in Chrome seem to be unable to "stop on all errors", as Firebug does.

Compare object instances for equality by their attributes

Instance of a class when compared with == comes to non-equal. The best way is to ass the cmp function to your class which will do the stuff.

If you want to do comparison by the content you can simply use cmp(obj1,obj2)

In your case cmp(doc1,doc2) It will return -1 if the content wise they are same.

SQLSTATE[HY000] [1698] Access denied for user 'root'@'localhost'

These steps worked for me on several Systems using Ubuntu 16.04, Apache 2.4, MariaDB, PDO

log into MYSQL as root
```
mysql -u root
```

Grant privileges. To a new user execute:

CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'newuser'@'localhost';
FLUSH PRIVILEGES;

UPDATE for Google Cloud Instances

MySQL on Google Cloud seem to require an alternate command (mind the backticks).

GRANT ALL PRIVILEGES ON `%`.* TO 'newuser'@'localhost';

bind to all addresses:

The easiest way is to comment out the line in your /etc/mysql/mariadb.conf.d/50-server.cnf or /etc/mysql/mysql.conf.d/mysqld.cnf file, depending on what system you are running:
```
#bind-address = 127.0.0.1 
```
exit mysql and restart mysql
```
exit
service mysql restart
```

By default it binds only to localhost, but if you comment the line it binds to all interfaces it finds. Commenting out the line is equivalent to bind-address=*.

To check the binding of mysql service execute as root:

netstat -tupan | grep mysql

Retrieve a single file from a repository

A nuanced variant of some of the answers here that answers the OP's question:

git archive [email protected]:foo/bar.git \
  HEAD path/to/file.txt | tar -xO path/to/file.txt > file.txt

Vim for Windows - What do I type to save and exit from a file?

Instead of telling you how you could execute a certain command (Esc:wq), I can provide you two links that may help you with VIM:

http://bullium.com/support/vim.html provides an HTML quick reference card
http://tnerual.eriogerg.free.fr/vim.html provides a PDF quick reference card in several languages, optimized for print-out, fold and put on your desk drawer

However, the best way to learn Vim is not only using it for Git commits, but as a regular editor for your everyday work.

If you're not going to switch to Vim, it's nonsense to keep its commands in mind. In that case, go and set up your favourite editor to use with Git.

How can I display an RTSP video stream in a web page?

One option would be to use some sort of streaming server/gateway. I tried various solutions (vlc, ffmpeg and a few more) and the one that worked best for me was Janus WebRTC server. It is somewhat difficult to set up, and you will have to compile it from source(when I tried it the version in Ubuntu repos didn't have RTSP support), but they have detailed compiling instructions and documentation on how to set everything up.

I managed to get video and audio feed from 3 FullHD cameras on local network with very little delay. I can confirm it works with Dahua and Hikvision cameras (not sure if all models).

What I used was Ubuntu Server 18.04 running Apache web server, and Chrome as a browser (it did not work on Firefox by default but perhaps there are workarounds for it).

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

do while loop, it's flexable and fast and easy to read and write.

auto textRegion = m_pdfTextRegions.begin();
    while(textRegion != m_pdfTextRegions.end())
    {
        if ((*textRegion)->glyphs.empty())
        {
            m_pdfTextRegions.erase(textRegion);
            textRegion = m_pdfTextRegions.begin();
        }
        else
            textRegion++;
    }

Executing multiple SQL queries in one statement with PHP

Pass 65536 to mysql_connect as 5th parameter.

Example:

$conn = mysql_connect('localhost','username','password', true, 65536 /* here! */) 
    or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");
mysql_query("
    INSERT INTO table1 (field1,field2) VALUES(1,2);

    INSERT INTO table2 (field3,field4,field5) VALUES(3,4,5);

    DELETE FROM table3 WHERE field6 = 6;

    UPDATE table4 SET field7 = 7 WHERE field8 = 8;

    INSERT INTO table5
       SELECT t6.field11, t6.field12, t7.field13
       FROM table6 t6
       INNER JOIN table7 t7 ON t7.field9 = t6.field10;

    -- etc
");

When you are working with mysql_fetch_* or mysql_num_rows, or mysql_affected_rows, only the first statement is valid.

For example, the following codes, the first statement is INSERT, you cannot execute mysql_num_rows and mysql_fetch_*. It is okay to use mysql_affected_rows to return how many rows inserted.

$conn = mysql_connect('localhost','username','password', true, 65536) or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");
mysql_query("
    INSERT INTO table1 (field1,field2) VALUES(1,2);
    SELECT * FROM table2;
");

Another example, the following codes, the first statement is SELECT, you cannot execute mysql_affected_rows. But you can execute mysql_fetch_assoc to get a key-value pair of row resulted from the first SELECT statement, or you can execute mysql_num_rows to get number of rows based on the first SELECT statement.

$conn = mysql_connect('localhost','username','password', true, 65536) or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");
mysql_query("
    SELECT * FROM table2;
    INSERT INTO table1 (field1,field2) VALUES(1,2);
");

How to redirect Valgrind's output to a file?

In addition to the other answers (particularly by Lekakis), some string replacements can also be used in the option --log-file= as elaborated in the Valgrind's user manual.

Four replacements were available at the time of writing:

%p: Prints the current process ID
- valgrind --log-file="myFile-%p.dat" <application-name>
%n: Prints file sequence number unique for the current process
- valgrind --log-file="myFile-%p-%n.dat" <application-name>
%q{ENV}: Prints contents of the environment variable ENV
- valgrind --log-file="myFile-%q{HOME}.dat" <application-name>
%%: Prints %
- valgrind --log-file="myFile-%%.dat" <application-name>

How do I get an element to scroll into view, using jQuery?

After trial and error I came up with this function, works with iframe too.

function bringElIntoView(el) {    
    var elOffset = el.offset();
    var $window = $(window);
    var windowScrollBottom = $window.scrollTop() + $window.height();
    var scrollToPos = -1;
    if (elOffset.top < $window.scrollTop()) // element is hidden in the top
        scrollToPos = elOffset.top;
    else if (elOffset.top + el.height() > windowScrollBottom) // element is hidden in the bottom
        scrollToPos = $window.scrollTop() + (elOffset.top + el.height() - windowScrollBottom);
    if (scrollToPos !== -1)
        $('html, body').animate({ scrollTop: scrollToPos });
}

How do I cancel form submission in submit button onclick event?

You need to return false;:

<input type='submit' value='submit request' onclick='return btnClick();' />

function btnClick() {
    return validData();
}

How to retrieve raw post data from HttpServletRequest in java

This worked for me: (notice that java 8 is required)

String requestData = request.getReader().lines().collect(Collectors.joining());
UserJsonParser u = gson.fromJson(requestData, UserJsonParser.class);

UserJsonParse is a class that shows gson how to parse the json formant.

class is like that:

public class UserJsonParser {

    private String username;
    private String name;
    private String lastname;
    private String mail;
    private String pass1;
//then put setters and getters
}

the json string that is parsed is like that:

$jsonData: {    "username": "testuser",    "pass1": "clave1234" }

The rest of values (mail, lastname, name) are set to null

How can I build multiple submit buttons django form?

You can use self.data in the clean_email method to access the POST data before validation. It should contain a key called newsletter_sub or newsletter_unsub depending on which button was pressed.

# in the context of a django.forms form

def clean(self):
    if 'newsletter_sub' in self.data:
        # do subscribe
    elif 'newsletter_unsub' in self.data:
        # do unsubscribe

How to read an external local JSON file in JavaScript?

The loading of a .json file from harddisk is an asynchronous operation and thus it needs to specify a callback function to execute after the file is loaded.

function readTextFile(file, callback) {
    var rawFile = new XMLHttpRequest();
    rawFile.overrideMimeType("application/json");
    rawFile.open("GET", file, true);
    rawFile.onreadystatechange = function() {
        if (rawFile.readyState === 4 && rawFile.status == "200") {
            callback(rawFile.responseText);
        }
    }
    rawFile.send(null);
}

//usage:
readTextFile("/Users/Documents/workspace/test.json", function(text){
    var data = JSON.parse(text);
    console.log(data);
});

This function works also for loading a .html or .txt files, by overriding the mime type parameter to "text/html", "text/plain" etc.

How to get the element clicked (for the whole document)?

Use delegate and event.target. delegate takes advantage of the event bubbling by letting one element listen for, and handle, events on child elements. target is the jQ-normalized property of the event object representing the object from which the event originated.

$(document).delegate('*', 'click', function (event) {
    // event.target is the element
    // $(event.target).text() gets its text
});

Demo: http://jsfiddle.net/xXTbP/

How do I move focus to next input with jQuery?

you cat use it

$(document).on("keypress","input,select",function (e) {
    e.preventDefault();
    if (e.keyCode==13) {
        $(':input:eq(' + ($(':input').index(this) + 1) +')').focus();
    }
});

Get difference between two dates in months using Java

You can try this:

Calendar sDate = Calendar.getInstance();
Calendar eDate = Calendar.getInstance();
sDate.setTime(startDate.getTime());
eDate.setTime(endDate.getTime());
int difInMonths = sDate.get(Calendar.MONTH) - eDate.get(Calendar.MONTH);

I think this should work. I used something similar for my project and it worked for what I needed (year diff). You get a Calendar from a Date and just get the month's diff.

Pandas convert dataframe to array of tuples

Motivation
Many data sets are large enough that we need to concern ourselves with speed/efficiency. So I offer this solution in that spirit. It happens to also be succinct.

For the sake of comparison, let's drop the index column

df = data_set.drop('index', 1)

Solution
I'll propose the use of zip and map

list(zip(*map(df.get, df)))

[('2012-02-17', 24.75, 25.03),
 ('2012-02-16', 25.0, 25.07),
 ('2012-02-15', 24.99, 25.15),
 ('2012-02-14', 24.68, 25.05),
 ('2012-02-13', 24.62, 24.77),
 ('2012-02-10', 24.38, 24.61)]

It happens to also be flexible if we wanted to deal with a specific subset of columns. We'll assume the columns we've already displayed are the subset we want.

list(zip(*map(df.get, ['data_date', 'data_1', 'data_2'])))

[('2012-02-17', 24.75, 25.03),
 ('2012-02-16', 25.0, 25.07),
 ('2012-02-15', 24.99, 25.15),
 ('2012-02-14', 24.68, 25.05),
 ('2012-02-13', 24.62, 24.77),
 ('2012-02-10', 24.38, 24.61)]

What is Quicker?

Turn's out records is quickest followed by asymptotically converging zipmap and iter_tuples

I'll use a library simple_benchmarks that I got from this post

from simple_benchmark import BenchmarkBuilder
b = BenchmarkBuilder()

import pandas as pd
import numpy as np

def tuple_comp(df): return [tuple(x) for x in df.to_numpy()]
def iter_namedtuples(df): return list(df.itertuples(index=False))
def iter_tuples(df): return list(df.itertuples(index=False, name=None))
def records(df): return df.to_records(index=False).tolist()
def zipmap(df): return list(zip(*map(df.get, df)))

funcs = [tuple_comp, iter_namedtuples, iter_tuples, records, zipmap]
for func in funcs:
    b.add_function()(func)

def creator(n):
    return pd.DataFrame({"A": random.randint(n, size=n), "B": random.randint(n, size=n)})

@b.add_arguments('Rows in DataFrame')
def argument_provider():
    for n in (10 ** (np.arange(4, 11) / 2)).astype(int):
        yield n, creator(n)

r = b.run()

Check the results

r.to_pandas_dataframe().pipe(lambda d: d.div(d.min(1), 0))

        tuple_comp  iter_namedtuples  iter_tuples   records    zipmap
100       2.905662          6.626308     3.450741  1.469471  1.000000
316       4.612692          4.814433     2.375874  1.096352  1.000000
1000      6.513121          4.106426     1.958293  1.000000  1.316303
3162      8.446138          4.082161     1.808339  1.000000  1.533605
10000     8.424483          3.621461     1.651831  1.000000  1.558592
31622     7.813803          3.386592     1.586483  1.000000  1.515478
100000    7.050572          3.162426     1.499977  1.000000  1.480131

r.plot()

SSL Proxy/Charles and Android trouble

The top rated answers are working perfect (a bit old but still working), but I just want to mention that since Android N we all can configure your apps in order to have diff trust SSL certificates (for release , debug only and so on), including Charles SSL Proxy certificate (if you download the Charles certificate and put .pem file in your raw folder). More info can be found here: https://developer.android.com/training/articles/security-config.html

Also the official Charles documentation can be useful to setup this : https://www.charlesproxy.com/documentation/using-charles/ssl-certificates/

Hope this will help to setup Charles inside your app project not on every single Android device.

Regex to split a CSV

This one matches all i need in c#:

(?<=(^|,)(?<quote>"?))([^"]|(""))*?(?=\<quote>(?=,|$))

strips quotes
lets new lines
lets double quotes in the quoted string
lets commas in the quoted string

Checking for a null int value from a Java ResultSet

I think, it is redundant. rs.getObject("ID_PARENT") should return an Integer object or null, if the column value actually was NULL. So it should even be possible to do something like:

if (rs.next()) {
  Integer idParent = (Integer) rs.getObject("ID_PARENT");
  if (idParent != null) {
    iVal = idParent; // works for Java 1.5+
  } else {
    // handle this case
  }      
}

Flask-SQLalchemy update a row's information

There is a method update on BaseQuery object in SQLAlchemy, which is returned by filter_by.

num_rows_updated = User.query.filter_by(username='admin').update(dict(email='[email protected]')))
db.session.commit()

The advantage of using update over changing the entity comes when there are many objects to be updated.

If you want to give add_user permission to all the admins,

rows_changed = User.query.filter_by(role='admin').update(dict(permission='add_user'))
db.session.commit()

Notice that filter_by takes keyword arguments (use only one =) as opposed to filter which takes an expression.

Fancybox doesn't work with jQuery v1.9.0 [ f.browser is undefined / Cannot read property 'msie' ]

Hi this is due to new version of the jQuery => 1.9.0

you can check the update : http://blog.jquery.com/2013/01/15/jquery-1-9-final-jquery-2-0-beta-migrate-final-released/

jQuery.Browser is deprecated. you can keep latest version by adding a migration script : http://code.jquery.com/jquery-migrate-1.0.0.js

replace :

<script src="http://code.jquery.com/jquery-latest.js"></script>

by :

<script src="http://code.jquery.com/jquery-latest.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.0.0.js"></script>

in your page and its working.

Maximum size for a SQL Server Query? IN clause? Is there a Better Approach

Can you load the GUIDs into a scratch table then do a

... WHERE var IN SELECT guid FROM #scratchtable

PHP: Inserting Values from the Form into MySQL

<!DOCTYPE html>
<?php
$con = new mysqli("localhost","root","","form");

?>



<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script type="text/javascript">
$(document).ready(function(){
 //$("form").submit(function(e){

     $("#btn1").click(function(e){
     e.preventDefault();
    // alert('here');
        $(".apnew").append('<input type="text" placeholder="Enter youy Name" name="e1[]"/><br>');

    });
    //}
});
</script>

</head>

<body>
<h2><b>Register Form<b></h2>
<form method="post" enctype="multipart/form-data">
<table>
<tr><td>Name:</td><td><input type="text" placeholder="Enter youy Name" name="e1[]"/>
<div class="apnew"></div><button id="btn1">Add</button></td></tr>
<tr><td>Image:</td><td><input type="file"  name="e5[]" multiple="" accept="image/jpeg,image/gif,image/png,image/jpg"/></td></tr>

<tr><td>Address:</td><td><textarea  cols="20" rows="4" name="e2"></textarea></td></tr>
<tr><td>Contact:</td><td><div id="textnew"><input  type="number"  maxlength="10" name="e3"/></div></td></tr>
<tr><td>Gender:</td><td><input type="radio"  name="r1" value="Male" checked="checked"/>Male<input type="radio"  name="r1" value="feale"/>Female</td></tr>
<tr><td><input  id="submit" type="submit" name="t1" value="save" /></td></tr>
</table>
<?php
//echo '<pre>';print_r($_FILES);exit();
if(isset($_POST['t1']))
{
$values = implode(", ", $_POST['e1']);
$imgarryimp=array();
foreach($_FILES["e5"]["tmp_name"] as $key=>$val){


move_uploaded_file($_FILES["e5"]["tmp_name"][$key],"images/".$_FILES["e5"]["name"][$key]);

                     $fname = $_FILES['e5']['name'][$key];
                     $imgarryimp[]=$fname;
                     //echo $fname;

                     if(strlen($fname)>0)
                      {
                         $img = $fname;
                      }
                      $d="insert into form(name,address,contact,gender,image)values('$values','$_POST[e2]','$_POST[e3]','$_POST[r1]','$img')";

       if($con->query($d)==TRUE)
         {
         echo "Yoy Data Save Successfully!!!";
         }
}
exit;





                      // echo $values;exit;
                      //foreach($_POST['e1'] as $row) 
    //{ 

    $d="insert into form(name,address,contact,gender,image)values('$values','$_POST[e2]','$_POST[e3]','$_POST[r1]','$img')";

       if($con->query($d)==TRUE)
         {
         echo "Yoy Data Save Successfully!!!";
         }
    //}
    //exit;


}
?>

</form>

<table>
<?php 
$t="select * from form";
$y=$con->query($t);
foreach ($y as $q);
{
?>
<tr>
<td>Name:<?php echo $q['name'];?></td>
<td>Address:<?php echo $q['address'];?></td>
<td>Contact:<?php echo $q['contact'];?></td>
<td>Gender:<?php echo $q['gender'];?></td>
</tr>
<?php }?>
</table>

</body>
</html>

How do I release memory used by a pandas dataframe?

del df will not be deleted if there are any reference to the df at the time of deletion. So you need to to delete all the references to it with del df to release the memory.

So all the instances bound to df should be deleted to trigger garbage collection.

Use objgragh to check which is holding onto the objects.

Bootstrap 3.0 - Fluid Grid that includes Fixed Column Sizes

There's really no easy way to mix fluid and fixed widths with Bootstrap 3. It's meant to be like this, as the grid system is designed to be a fluid, responsive thing. You could try hacking something up, but it would go against what the Responsive Grid system is trying to do, the intent of which is to make that layout flow across different device types.

If you need to stick with this layout, I'd consider laying out your page with custom CSS and not using the grid.

How to define an enum with string value?

You can't do this with enums, but you can do it like that:

public static class SeparatorChars
{
    public static string Comma = ",";

    public static string Tab = "\t";

    public static string Space = " ";
}

Full Screen DialogFragment in Android

A solution by using the new ConstraintLayout is wrapping the ConstraintLayout in a LinearLayout with minHeight and minWidth fixed. Without the wrapping, ConstraintLayout is not getting the right size for the Dialog.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="1000dp"
    android:minHeight="1000dp"
    android:orientation="vertical">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/background_color"
        android:orientation="vertical">
        <!-- some constrained views -->
    </androidx.constraintlayout.widget.ConstraintLayout>

</LinearLayout>

Select subset of columns in data.table R

Option using dplyr

require(dplyr)
dt<-as.data.frame(matrix(runif(10*10),10,10))
dt <- select(dt, -V1, -V2, -V3, -V4)
cor(dt)

init() got an unexpected keyword argument 'user'

LivingRoom.objects.create() calls LivingRoom.__init__() - as you might have noticed if you had read the traceback - passing it the same arguments. To make a long story short, a Django models.Model subclass's initializer is best left alone, or should accept *args and **kwargs matching the model's meta fields. The correct way to provide default values for fields is in the field constructor using the default keyword as explained in the FineManual.

Fixed digits after decimal with f-strings

When it comes to float numbers, you can use format specifiers:

f'{value:{width}.{precision}}'

where:

value is any expression that evaluates to a number
width specifies the number of characters used in total to display, but if value needs more space than the width specifies then the additional space is used.
precision indicates the number of characters used after the decimal point

What you are missing is the type specifier for your decimal value. In this link, you an find the available presentation types for floating point and decimal.

Here you have some examples, using the f (Fixed point) presentation type:

# notice that it adds spaces to reach the number of characters specified by width
In [1]: f'{1 + 3 * 1.5:10.3f}'
Out[1]: '     5.500'

# notice that it uses more characters than the ones specified in width
In [2]: f'{3000 + 3 ** (1 / 2):2.1f}' 
Out[2]: '3001.7'

In [3]: f'{1.2345 + 4 ** (1 / 2):9.6f}'
Out[3]: ' 3.234500'

# omitting width but providing precision will use the required characters to display the number with the the specified decimal places
In [4]: f'{1.2345 + 3 * 2:.3f}' 
Out[4]: '7.234'

# not specifying the format will display the number with as many digits as Python calculates
In [5]: f'{1.2345 + 3 * 0.5}'
Out[5]: '2.7344999999999997'

Darken background image on hover

You can use opacity:

.image {
    background: url('http://cdn1.iconfinder.com/data/icons/round-simple-social-icons/58/facebook.png');
    width: 58px;
    height: 58px;
    opacity:0.5;
}

.image:hover{
    opacity:1;
}

JSFiddle

Converting camel case to underscore case in ruby

You can use

"CamelCasedName".tableize.singularize

Or just

"CamelCasedName".underscore

Both options ways will yield "camel_cased_name". You can check more details it here.

Why is it OK to return a 'vector' from a function?

This is actually a failure of design. You shouldn't be using a return value for anything not a primitive for anything that is not relatively trivial.

The ideal solution should be implemented through a return parameter with a decision on reference/pointer and the proper use of a "const\'y\'ness" as a descriptor.

On top of this, you should realise that the label on an array in C and C++ is effectively a pointer and its subscription are effectively an offset or an addition symbol.

So the label or ptr array_ptr === array label thus returning foo[offset] is really saying return element at memory pointer location foo + offset of type return type.

cannot be cast to java.lang.Comparable

I faced a similar kind of issue while using a custom object as a key in Treemap. Whenever you are using a custom object as a key in hashmap then you override two function equals and hashcode, However if you are using ContainsKey method of Treemap on this object then you need to override CompareTo method as well otherwise you will be getting this error Someone using a custom object as a key in hashmap in kotlin should do like following

 data class CustomObjectKey(var key1:String = "" , var 
 key2:String = ""):Comparable<CustomObjectKey?>
 {
override fun compareTo(other: CustomObjectKey?): Int {
    if(other == null)
        return -1
   // suppose you want to do comparison based on key 1 
    return this.key1.compareTo((other)key1)
}

override fun equals(other: Any?): Boolean {
    if(other == null)
        return false
    return this.key1 == (other as CustomObjectKey).key1
}

override fun hashCode(): Int {
    return this.key1.hashCode()
} 
}

How do I retrieve a textbox value using JQuery?

You need to use the val() function to get the textbox value. text does not exist as a property only as a function and even then its not the correct function to use in this situation.

var from = $("input#fromAddress").val()

val() is the standard function for getting the value of an input.

Getting "Skipping JaCoCo execution due to missing execution data file" upon executing JaCoCo

Try to use:

mvn jacoco:report -debug

to see the details about your reporting process.

I configured my jacoco like this:

<configuration>
    <dataFile>~/jacoco.exec</dataFile>
    <outputDirectory>~/jacoco</outputDirectory>
</configuration>

Then mvn jacoco:report -debug shows it using the default configuration, which means jacoco.exec is not in ~/jacoco.exec. The error says missing execution data file.

So just use the default configuration:

<execution>
    <id>default-report</id>
    <goals>
    </goals>
    <configuration>
        <dataFile>${project.build.directory}/jacoco.exec</dataFile>
        <outputDirectory>${project.reporting.outputDirectory}/jacoco</outputDirectory>
    </configuration>
</execution>

And everything works fine.

Android: How to change the ActionBar "Home" Icon to be something other than the app icon?

Please Try, if use "extends AppCompatActivity" and present actionbar.

 ActionBar eksinbar=getSupportActionBar();
if (eksinbar != null) {
    eksinbar.setDisplayHomeAsUpEnabled(true);
    eksinbar.setHomeAsUpIndicator(R.mipmap.imagexxx);
}

Postgresql SQL: How check boolean field with null and True,False Value?

I'm not expert enough in the inner workings of Postgres to know why your query with the double condition in the WHERE clause be not working. But one way to get around this would be to use a UNION of the two queries which you know do work:

SELECT * FROM table_name WHERE boolean_column IS NULL
UNION
SELECT * FROM table_name WHERE boolean_column = FALSE

You could also try using COALESCE:

SELECT * FROM table_name WHERE COALESCE(boolean_column, FALSE) = FALSE

This second query will replace all NULL values with FALSE and then compare against FALSE in the WHERE condition.

Hide options in a select list using jQuery

Having tested, the solutions posted above by various, including chaos, to hide elements do now work in the latest versions of Firefox (66.0.4), Chrome (74.0.3729.169) and Edge (42.17134.1.0)

$("#edit-field-service-sub-cat-value option[value=" + title + "]").hide();
$("#edit-field-service-sub-cat-value option[value=" + title + "]").show();

For IE, this does not work, however you can disable the option

$("#edit-field-service-sub-cat-value option[value=" + title + "]").attr("disabled", "disabled");
$("#edit-field-service-sub-cat-value option[value=" + title + "]").removeAttr("disabled");

and then force the selection of a different value.

$("#edit-field-service-sub-cat-value").val("0");

Note, for a disabled option, the val of the drop down will now be null, not the value of the selected option if it is disabled.

Formatting a double to two decimal places

Well, depending on your needs you can choose any of the following. Out put is written against each method

You can choose the one you need

This will round

decimal d = 2.5789m;
Console.WriteLine(d.ToString("#.##")); // 2.58

This will ensure that 2 decimal places are written.

d = 2.5m;
Console.WriteLine(d.ToString("F")); //2.50

if you want to write commas you can use this

d=23545789.5432m;
Console.WriteLine(d.ToString("n2")); //23,545,789.54

if you want to return the rounded of decimal value you can do this

d = 2.578m;
d = decimal.Round(d, 2, MidpointRounding.AwayFromZero); //2.58

How do I uninstall a package installed using npm link?

The package can be uninstalled using the same uninstall or rm command that can be used for removing installed packages. The only thing to keep in mind is that the link needs to be uninstalled globally - the --global flag needs to be provided.

In order to uninstall the globally linked foo package, the following command can be used (using sudo if necessary, depending on your setup and permissions)

sudo npm rm --global foo

This will uninstall the package.

To check whether a package is installed, the npm ls command can be used:

npm ls --global foo

What's the difference between disabled="disabled" and readonly="readonly" for HTML form input fields?

If the value of a disabled textbox needs to be retained when a form is cleared (reset), disabled = "disabled" has to be used, as read-only textbox will not retain the value

For Example:

HTML

Textbox

<input type="text" id="disabledText" name="randombox" value="demo" disabled="disabled" />

Reset button

<button type="reset" id="clearButton">Clear</button>

In the above example, when Clear button is pressed, disabled text value will be retained in the form. Value will not be retained in the case of input type = "text" readonly="readonly"

Stopping python using ctrl+c

The interrupt process is hardware and OS dependent. So you will have very different behavior depending on where you run your python script. For example, on Windows machines we have Ctrl+C (SIGINT) and Ctrl+Break (SIGBREAK).

So while SIGINT is present on all systems and can be handled and caught, the SIGBREAK signal is Windows specific (and can be disabled in CONFIG.SYS) and is really handled by the BIOS as an interrupt vector INT 1Bh, which is why this key is much more powerful than any other. So if you're using some *nix flavored OS, you will get different results depending on the implementation, since that signal is not present there, but others are. In Linux you can check what signals are available to you by:

$ kill -l
 1) SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL       5) SIGTRAP
 6) SIGABRT      7) SIGEMT       8) SIGFPE       9) SIGKILL     10) SIGBUS
11) SIGSEGV     12) SIGSYS      13) SIGPIPE     14) SIGALRM     15) SIGTERM
16) SIGURG      17) SIGSTOP     18) SIGTSTP     19) SIGCONT     20) SIGCHLD
21) SIGTTIN     22) SIGTTOU     23) SIGIO       24) SIGXCPU     25) SIGXFSZ
26) SIGVTALRM   27) SIGPROF     28) SIGWINCH    29) SIGPWR      30) SIGUSR1
31) SIGUSR2     32) SIGRTMAX

So if you want to catch the CTRL+BREAK signal on a linux system you'll have to check to what POSIX signal they have mapped that key. Popular mappings are:

CTRL+\     = SIGQUIT 
CTRL+D     = SIGQUIT
CTRL+C     = SIGINT
CTRL+Z     = SIGTSTOP 
CTRL+BREAK = SIGKILL or SIGTERM or SIGSTOP

In fact, many more functions are available under Linux, where the SysRq (System Request) key can take on a life of its own...

angularjs to output plain text instead of html

Use this function like

 String.prototype.text=function(){
   return this ? String(this).replace(/<[^>]+>/gm, '') : '';
 }

  "<span>My text</span>".text()
  output:
  My text

Fiddle

How to download a file via FTP with Python ftplib

A = filename

ftp = ftplib.FTP("IP")
ftp.login("USR Name", "Pass")
ftp.cwd("/Dir")


try:
    ftp.retrbinary("RETR " + filename ,open(A, 'wb').write)
except:
    print "Error"

How to read numbers from file in Python?

is working with both python2(e.g. Python 2.7.10) and python3(e.g. Python 3.6.4)

with open('in.txt') as f:
  rows,cols=np.fromfile(f, dtype=int, count=2, sep=" ")
  data = np.fromfile(f, dtype=int, count=cols*rows, sep=" ").reshape((rows,cols))

another way: is working with both python2(e.g. Python 2.7.10) and python3(e.g. Python 3.6.4), as well for complex matrices see the example below (only change int to complex)

with open('in.txt') as f:
   data = []
   cols,rows=list(map(int, f.readline().split()))
   for i in range(0, rows):
      data.append(list(map(int, f.readline().split()[:cols])))
print (data)

I updated the code, this method is working for any number of matrices and any kind of matrices(int,complex,float) in the initial in.txt file.

This program yields matrix multiplication as an application. Is working with python2, in order to work with python3 make the following changes

print to print()

and

print "%7g" %a[i,j],    to     print ("%7g" %a[i,j],end="")

the script:

import numpy as np

def printMatrix(a):
   print ("Matrix["+("%d" %a.shape[0])+"]["+("%d" %a.shape[1])+"]")
   rows = a.shape[0]
   cols = a.shape[1]
   for i in range(0,rows):
      for j in range(0,cols):
         print "%7g" %a[i,j],
      print
   print      

def readMatrixFile(FileName):
   rows,cols=np.fromfile(FileName, dtype=int, count=2, sep=" ")
   a = np.fromfile(FileName, dtype=float, count=rows*cols, sep=" ").reshape((rows,cols))
   return a

def readMatrixFileComplex(FileName):
   data = []
   rows,cols=list(map(int, FileName.readline().split()))
   for i in range(0, rows):
      data.append(list(map(complex, FileName.readline().split()[:cols])))
   a = np.array(data)
   return a

f = open('in.txt')
a=readMatrixFile(f)
printMatrix(a)
b=readMatrixFile(f)
printMatrix(b)
a1=readMatrixFile(f)
printMatrix(a1)
b1=readMatrixFile(f)
printMatrix(b1)
f.close()

print ("matrix multiplication")
c = np.dot(a,b)
printMatrix(c)
c1 = np.dot(a1,b1)
printMatrix(c1)

with open('complex_in.txt') as fid:
  a2=readMatrixFileComplex(fid)
  print(a2)
  b2=readMatrixFileComplex(fid)
  print(b2)

print ("complex matrix multiplication")
c2 = np.dot(a2,b2)
print(c2)
print ("real part of complex matrix")
printMatrix(c2.real)
print ("imaginary part of complex matrix")
printMatrix(c2.imag)

as input file I take in.txt:

4 4
1 1 1 1
2 4 8 16
3 9 27 81
4 16 64 256
4 3
4.02 -3.0 4.0
-13.0 19.0 -7.0
3.0 -2.0 7.0
-1.0 1.0 -1.0
3 4
1 2 -2 0
-3 4 7 2
6 0 3 1
4 2
-1 3
0 9
1 -11
4 -5

and complex_in.txt

3 4
1+1j 2+2j -2-2j 0+0j
-3-3j 4+4j 7+7j 2+2j
6+6j 0+0j 3+3j 1+1j
4 2
-1-1j 3+3j
0+0j 9+9j
1+1j -11-11j
4+4j -5-5j

and the output look like:

Matrix[4][4]
     1      1      1      1
     2      4      8     16
     3      9     27     81
     4     16     64    256

Matrix[4][3]
  4.02     -3      4
   -13     19     -7
     3     -2      7
    -1      1     -1

Matrix[3][4]
     1      2     -2      0
    -3      4      7      2
     6      0      3      1

Matrix[4][2]
    -1      3
     0      9
     1    -11
     4     -5

matrix multiplication
Matrix[4][3]
  -6.98      15       3
 -35.96      70      20
-104.94     189      57
-255.92     420      96

Matrix[3][2]
    -3     43
    18    -60
     1    -20

[[ 1.+1.j  2.+2.j -2.-2.j  0.+0.j]
 [-3.-3.j  4.+4.j  7.+7.j  2.+2.j]
 [ 6.+6.j  0.+0.j  3.+3.j  1.+1.j]]
[[ -1. -1.j   3. +3.j]
 [  0. +0.j   9. +9.j]
 [  1. +1.j -11.-11.j]
 [  4. +4.j  -5. -5.j]]
complex matrix multiplication
[[ 0.  -6.j  0. +86.j]
 [ 0. +36.j  0.-120.j]
 [ 0.  +2.j  0. -40.j]]
real part of complex matrix
Matrix[3][2]
      0       0
      0       0
      0       0

imaginary part of complex matrix
Matrix[3][2]
     -6      86
     36    -120
      2     -40

Python - How to cut a string in Python?

Well, to answer the immediate question:

>>> s = "http://www.domain.com/?s=some&two=20"

The rfind method returns the index of right-most substring:

>>> s.rfind("&")
29

You can take all elements up to a given index with the slicing operator:

>>> "foobar"[:4]
'foob'

Putting the two together:

>>> s[:s.rfind("&")]
'http://www.domain.com/?s=some'

If you are dealing with URLs in particular, you might want to use built-in libraries that deal with URLs. If, for example, you wanted to remove two from the above query string:

First, parse the URL as a whole:

>>> import urlparse, urllib
>>> parse_result = urlparse.urlsplit("http://www.domain.com/?s=some&two=20")
>>> parse_result
SplitResult(scheme='http', netloc='www.domain.com', path='/', query='s=some&two=20', fragment='')

Take out just the query string:

>>> query_s = parse_result.query
>>> query_s
's=some&two=20'

Turn it into a dict:

>>> query_d = urlparse.parse_qs(parse_result.query)
>>> query_d
{'s': ['some'], 'two': ['20']}
>>> query_d['s']
['some']
>>> query_d['two']
['20']

Remove the 'two' key from the dict:

>>> del query_d['two']
>>> query_d
{'s': ['some']}

Put it back into a query string:

>>> new_query_s = urllib.urlencode(query_d, True)
>>> new_query_s
's=some'

And now stitch the URL back together:

>>> result = urlparse.urlunsplit((
    parse_result.scheme, parse_result.netloc,
    parse_result.path, new_query_s, parse_result.fragment))
>>> result
'http://www.domain.com/?s=some'

The benefit of this is that you have more control over the URL. Like, if you always wanted to remove the two argument, even if it was put earlier in the query string ("two=20&s=some"), this would still do the right thing. It might be overkill depending on what you want to do.

Why is ZoneOffset.UTC != ZoneId.of("UTC")?

The answer comes from the javadoc of ZoneId (emphasis mine) ...

A ZoneId is used to identify the rules used to convert between an Instant and a LocalDateTime. There are two distinct types of ID:

Fixed offsets - a fully resolved offset from UTC/Greenwich, that uses the same offset for all local date-times

Geographical regions - an area where a specific set of rules for finding the offset from UTC/Greenwich apply

Most fixed offsets are represented by ZoneOffset. Calling normalized() on any ZoneId will ensure that a fixed offset ID will be represented as a ZoneOffset.

... and from the javadoc of ZoneId#of (emphasis mine):

This method parses the ID producing a ZoneId or ZoneOffset. A ZoneOffset is returned if the ID is 'Z', or starts with '+' or '-'.

The argument id is specified as "UTC", therefore it will return a ZoneId with an offset, which also presented in the string form:

System.out.println(now.withZoneSameInstant(ZoneOffset.UTC));
System.out.println(now.withZoneSameInstant(ZoneId.of("UTC")));

Outputs:

2017-03-10T08:06:28.045Z
2017-03-10T08:06:28.045Z[UTC]

As you use the equals method for comparison, you check for object equivalence. Because of the described difference, the result of the evaluation is false.

When the normalized() method is used as proposed in the documentation, the comparison using equals will return true, as normalized() will return the corresponding ZoneOffset:

Normalizes the time-zone ID, returning a ZoneOffset where possible.

now.withZoneSameInstant(ZoneOffset.UTC)
    .equals(now.withZoneSameInstant(ZoneId.of("UTC").normalized())); // true

As the documentation states, if you use "Z" or "+0" as input id, of will return the ZoneOffset directly and there is no need to call normalized():

now.withZoneSameInstant(ZoneOffset.UTC).equals(now.withZoneSameInstant(ZoneId.of("Z"))); //true
now.withZoneSameInstant(ZoneOffset.UTC).equals(now.withZoneSameInstant(ZoneId.of("+0"))); //true

To check if they store the same date time, you can use the isEqual method instead:

now.withZoneSameInstant(ZoneOffset.UTC)
    .isEqual(now.withZoneSameInstant(ZoneId.of("UTC"))); // true

Sample

System.out.println("equals - ZoneId.of(\"UTC\"): " + nowZoneOffset
        .equals(now.withZoneSameInstant(ZoneId.of("UTC"))));
System.out.println("equals - ZoneId.of(\"UTC\").normalized(): " + nowZoneOffset
        .equals(now.withZoneSameInstant(ZoneId.of("UTC").normalized())));
System.out.println("equals - ZoneId.of(\"Z\"): " + nowZoneOffset
        .equals(now.withZoneSameInstant(ZoneId.of("Z"))));
System.out.println("equals - ZoneId.of(\"+0\"): " + nowZoneOffset
        .equals(now.withZoneSameInstant(ZoneId.of("+0"))));
System.out.println("isEqual - ZoneId.of(\"UTC\"): "+ nowZoneOffset
        .isEqual(now.withZoneSameInstant(ZoneId.of("UTC"))));

Output:

equals - ZoneId.of("UTC"): false
equals - ZoneId.of("UTC").normalized(): true
equals - ZoneId.of("Z"): true
equals - ZoneId.of("+0"): true
isEqual - ZoneId.of("UTC"): true

How to debug in Android Studio using adb over WiFi

Android wifi ADB was earlier working on my IDE but after Updating Android Studio (my current is Android Studio 3.3) it is not working and always prompt as "Unable to connect to device......Same network"

After spending much time i was unbale to resolve the issue.

Then i tried - WIFI ADB ULTIMATE by

https://github.com/huazhouwang/WIFIADB/tree/master/WIFIADBIntelliJPlugin

It worked for me.

Cannot resolve symbol 'AppCompatActivity'

This can might be in the version difference in the app level gradle check it once and then re-build

Prevent row names to be written to file when using write.csv

write.csv(t, "t.csv", row.names=FALSE)

From ?write.csv:

row.names: either a logical value indicating whether the row names of
          ‘x’ are to be written along with ‘x’, or a character vector
          of row names to be written.

dropping a global temporary table

Down the apache server by running below in putty cd $ADMIN_SCRIPTS_HOME ./adstpall.sh
Drop the Global temporary tables drop table t;

This will workout..

Get input value from TextField in iOS alert in Swift

Updated for Swift 3 and above:

//1. Create the alert controller.
let alert = UIAlertController(title: "Some Title", message: "Enter a text", preferredStyle: .alert)

//2. Add the text field. You can configure it however you need.
alert.addTextField { (textField) in
    textField.text = "Some default text"
}

// 3. Grab the value from the text field, and print it when the user clicks OK.
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { [weak alert] (_) in
    let textField = alert.textFields![0] // Force unwrapping because we know it exists.
    print("Text field: \(textField.text)")
}))

// 4. Present the alert.
self.present(alert, animated: true, completion: nil)

Swift 2.x

Assuming you want an action alert on iOS:

//1. Create the alert controller.            
var alert = UIAlertController(title: "Some Title", message: "Enter a text", preferredStyle: .Alert)

//2. Add the text field. You can configure it however you need.
alert.addTextFieldWithConfigurationHandler({ (textField) -> Void in
    textField.text = "Some default text."
})

//3. Grab the value from the text field, and print it when the user clicks OK. 
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { [weak alert] (action) -> Void in
    let textField = alert.textFields![0] as UITextField
    println("Text field: \(textField.text)")
}))

// 4. Present the alert.
self.presentViewController(alert, animated: true, completion: nil)

Update index after sorting data-frame

You can set new indices by using set_index:

df2.set_index(np.arange(len(df2.index)))

Output:

How to add a "confirm delete" option in ASP.Net Gridview?

This is my method and it works perfectly.

asp

 <asp:CommandField ButtonType="Link" ShowEditButton="true" ShowDeleteButton="true" ItemStyle-Width="5%" HeaderStyle-Width="5%" HeaderStyle-CssClass="color" HeaderText="Edit"
                                EditText="<span style='font-size: 20px; color: #27ae60;'><span class='glyphicons glyph-edit'></span></span>"
                                DeleteText="<span style='font-size: 20px; color: #c0392b;'><span class='glyphicons glyph-bin'></span></span>"
                                CancelText="<span style='font-size: 20px; color: #c0392b;'><span class='glyphicons glyph-remove-2'></span></span>" 
                                UpdateText="<span style='font-size: 20px; color: #2980b9;'><span class='glyphicons glyph-floppy-saved'></span></span>" />

C# (replace 5 with the column number of the button)

        if ((e.Row.RowState & DataControlRowState.Edit) > 0)
        {

        }
        else {
            ((LinkButton)e.Row.Cells[5].Controls[2]).OnClientClick = "return confirm('Do you really want to delete?');";

        }

Confused about str on list in Python

Well, container objects' __str__ methods will use repr on their contents, not str. So you could use __repr__ instead of __str__, seeing as you're using an ID as the result.

Add Keypair to existing EC2 instance

Though you can't add a key pair to a running EC2 instance directly, you can create a linux user and create a new key pair for him, then use it like you would with the original user's key pair.

In your case, you can ask the instance owner (who created it) to do the following. Thus, the instance owner doesn't have to share his own keys with you, but you would still be able to ssh into these instances. These steps were originally posted by Utkarsh Sengar (aka. @zengr) at http://utkarshsengar.com/2011/01/manage-multiple-accounts-on-1-amazon-ec2-instance/. I've made only a few small changes.

Step 1: login by default “ubuntu” user:

$ ssh -i my_orig_key.pem [email protected]

Step 2: create a new user, we will call our new user “john”:
```
[ubuntu@ip-11-111-111-111 ~]$ sudo adduser john
```
Set password for “john” by:
```
[ubuntu@ip-11-111-111-111 ~]$ sudo su -
[root@ip-11-111-111-111 ubuntu]# passwd john
```
Add “john” to sudoer’s list by:
```
[root@ip-11-111-111-111 ubuntu]# visudo
```
.. and add the following to the end of the file:
```
john   ALL = (ALL)    ALL
```
Alright! We have our new user created, now you need to generate the key file which will be needed to login, like we have my_orin_key.pem in Step 1.

Now, exit and go back to ubuntu, out of root.
```
[root@ip-11-111-111-111 ubuntu]# exit
[ubuntu@ip-11-111-111-111 ~]$
```

Step 3: creating the public and private keys:

[ubuntu@ip-11-111-111-111 ~]$ su john

Enter the password you created for “john” in Step 2. Then create a key pair. Remember that the passphrase for key pair should be at least 4 characters.

[john@ip-11-111-111-111 ubuntu]$ cd /home/john/
[john@ip-11-111-111-111 ~]$ ssh-keygen -b 1024 -f john -t dsa
[john@ip-11-111-111-111 ~]$ mkdir .ssh
[john@ip-11-111-111-111 ~]$ chmod 700 .ssh
[john@ip-11-111-111-111 ~]$ cat john.pub > .ssh/authorized_keys
[john@ip-11-111-111-111 ~]$ chmod 600 .ssh/authorized_keys
[john@ip-11-111-111-111 ~]$ sudo chown john:ubuntu .ssh

In the above step, john is the user we created and ubuntu is the default user group.

[john@ip-11-111-111-111 ~]$ sudo chown john:ubuntu .ssh/authorized_keys

Step 4: now you just need to download the key called “john”. I use scp to download/upload files from EC2, here is how you can do it.

You will still need to copy the file using ubuntu user, since you only have the key for that user name. So, you will need to move the key to ubuntu folder and chmod it to 777.
```
[john@ip-11-111-111-111 ~]$ sudo cp john /home/ubuntu/
[john@ip-11-111-111-111 ~]$ sudo chmod 777 /home/ubuntu/john
```
Now come to local machine’s terminal, where you have my_orig_key.pem file and do this:
```
$ cd ~/.ssh
$ scp -i my_orig_key.pem [email protected]:/home/ubuntu/john john
```
The above command will copy the key “john” to the present working directory on your local machine. Once you have copied the key to your local machine, you should delete “/home/ubuntu/john”, since it’s a private key.

Now, one your local machine chmod john to 600.
```
$ chmod 600 john
```
Step 5: time to test your key:
```
$ ssh -i john [email protected]
```

So, in this manner, you can setup multiple users to use one EC2 instance!!

How is a non-breaking space represented in a JavaScript string?

  is a HTML entity. When doing .text(), all HTML entities are decoded to their character values.

Instead of comparing using the entity, compare using the actual raw character:

var x = td.text();
if (x == '\xa0') { // Non-breakable space is char 0xa0 (160 dec)
  x = '';
}

Or you can also create the character from the character code manually it in its Javascript escaped form:

var x = td.text();
if (x == String.fromCharCode(160)) { // Non-breakable space is char 160
  x = '';
}

More information about String.fromCharCode is available here:

fromCharCode - MDC Doc Center

More information about character codes for different charsets are available here:

Windows-1252 Charset
UTF-8 Charset

How do you use variables in a simple PostgreSQL script?

You can use:

\set list '''foobar'''
SELECT * FROM dbo.PubLists WHERE name = :list;

That will do

How do I use cascade delete with SQL Server?

If the one to many relationship is from T1 to T2 then it doesn't represent a function and therefore cannot be used to deduce or infer an inverse function that guarantees the resulting T2 value doesn't omit tuples of T1 join T2 that are deductively valid, because there is no deductively valid inverse function. ( representing functions was the purpose of primary keys. ) The answer in SQL think is yes you can do it. The answer in relational think is no you can't do it. See points of ambiguity in Codd 1970. The relationship would have to be many-to-one from T1 to T2.

Fixed Table Cell Width

table { 
    table-layout:fixed; width:200px;
}
table tr {
    height: 20px;
}

10x10

Get a list of checked checkboxes in a div using jQuery

Combination of two previous answers:

var selected = [];
$('#checkboxes input:checked').each(function() {
    selected.push($(this).attr('name'));
});

Compare two folders which has many files inside contents

To get summary of new/missing files, and which files differ:

diff -arq folder1 folder2

a treats all files as text, r recursively searched subdirectories, q reports 'briefly', only when files differ

Passing arguments to require (when loading module)

I'm not sure if this will still be useful to people, but with ES6 I have a way to do it that I find clean and useful.

class MyClass { 
  constructor ( arg1, arg2, arg3 )
  myFunction1 () {...}
  myFunction2 () {...}
  myFunction3 () {...}
}

module.exports = ( arg1, arg2, arg3 ) => { return new MyClass( arg1,arg2,arg3 ) }

And then you get your expected behaviour.

var MyClass = require('/MyClass.js')( arg1, arg2, arg3 )

How to pass password to scp?

steps to get sshpass For rhel/centos 6 :

# wget http://epel.mirror.net.in/epel/6/i386/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm
# yum install sshpass

source: https://community.mapr.com/thread/9040

How can I display a messagebox in ASP.NET?

This code will help you add a MsgBox in your asp.net file. You can change the function definition to your requirements. Hope this helps!

protected void Addstaff_Click(object sender, EventArgs e)    
    {   
 if (intClassCapcity < intCurrentstaffNumber)     
                {                  
            MsgBox("Record cannot be added because max seats available for the " + (string)Session["course_name"] + " training has been reached");    
        }    
else    
    {   
            sqlClassList.Insert();    
    }    
}

private void MsgBox(string sMessage)    
    {    
        string msg = "<script language=\"javascript\">";    
        msg += "alert('" + sMessage + "');";    
        msg += "</script>";    
        Response.Write(msg);    
    }

Can't connect to MySQL server on 'localhost' (10061)

I tried Kuzhichamadam Inn's solution and found that a slight change needed to be made.

MYSQL57 was a network service. I had tried this repeatedly with no success. When I opened services.msc I found another service for localhost: MySQL. I started that one using the process below and it worked.

run > services.msc > rightclick MySQL > properties >start

ASP.Net Download file to client browser

Just a slight addition to the above solution if you are having problem with downloaded file's name...

Response.AddHeader("Content-Disposition", "attachment; filename=\"" + file.Name + "\"");

This will return the exact file name even if it contains spaces or other characters.

What reference do I need to use Microsoft.Office.Interop.Excel in .NET?

Make sure your project is 32 bit.

I had this problem, as soon as I ticked "Prefer 32 bit and rebuilt" all the Office Interop assemblies where available in Reference->Assemblies->Search "Office".

how to output every line in a file python

Firstly, as @l33tnerd said, f.close should be outside the for loop.

Secondly, you are only calling readline once, before the loop. That only reads the first line. The trick is that in Python, files act as iterators, so you can iterate over the file without having to call any methods on it, and that will give you one line per iteration:

 if data.find('!masters') != -1:
     f = open('masters.txt')
     for line in f:
           print line,
           sck.send('PRIVMSG ' + chan + " " + line)
     f.close()

Finally, you were referring to the variable lines inside the loop; I assume you meant to refer to line.

Edit: Oh and you need to indent the contents of the if statement.

Merging dictionaries in C#

Here is a helper function I use:

using System.Collections.Generic;
namespace HelperMethods
{
    public static class MergeDictionaries
    {
        public static void Merge<TKey, TValue>(this IDictionary<TKey, TValue> first, IDictionary<TKey, TValue> second)
        {
            if (second == null || first == null) return;
            foreach (var item in second) 
                if (!first.ContainsKey(item.Key)) 
                    first.Add(item.Key, item.Value);
        }
    }
}

What is the difference between #import and #include in Objective-C?

#include works just like the C #include.

#import keeps track of which headers have already been included and is ignored if a header is imported more than once in a compilation unit. This makes it unnecessary to use header guards.

The bottom line is just use #import in Objective-C and don't worry if your headers wind up importing something more than once.

Using an attribute of the current class instance as a default value for method's parameter

There are multiple false assumptions you're making here - First, function belong to a class and not to an instance, meaning the actual function involved is the same for any two instances of a class. Second, default parameters are evaluated at compile time and are constant (as in, a constant object reference - if the parameter is a mutable object you can change it). Thus you cannot access self in a default parameter and will never be able to.

PHP prepend leading zero before single digit number, on-the-fly

The universal tool for string formatting, sprintf:

$stamp = sprintf('%s%02s', $year, $month);

http://php.net/manual/en/function.sprintf.php

How to increase MySQL connections(max_connections)?

I had the same issue and I resolved it with MySQL workbench, as shown in the attached screenshot:

in the navigator (on the left side), under the section "management", click on "Status and System variables",
then choose "system variables" (tab at the top),
then search for "connection" in the search field,
and 5. you will see two fields that need to be adjusted to fit your needs (max_connections and mysqlx_max_connections).

Hope that helps!

The system does not allow me to upload pictures, instead please click on this link and you can see my screenshot...

Program "make" not found in PATH

Are you trying to run "Hello world" for the first time? Please make sure you choose proper toolchain. For Windows you have to choose MinGW GCC.

To make MinGW GCC compiler as default or change you original project with error "Program “make” not found in PATH" or "launch failed binary not found eclipse c++" when you trying to run program simply go to Windows >> Preferences >> C\C++ Build >> Tool Chain Editor >> Change Current toolchain to MinGW GCC

lists and arrays in VBA

You will have to change some of your data types but the basics of what you just posted could be converted to something similar to this given the data types I used may not be accurate.

Dim DateToday As String: DateToday = Format(Date, "yyyy/MM/dd")
Dim Computers As New Collection
Dim disabledList As New Collection
Dim compArray(1 To 1) As String

'Assign data to first item in array
compArray(1) = "asdf"

'Format = Item, Key
Computers.Add "ErrorState", "Computer Name"

'Prints "ErrorState"
Debug.Print Computers("Computer Name")

Collections cannot be sorted so if you need to sort data you will probably want to use an array.

Here is a link to the outlook developer reference. http://msdn.microsoft.com/en-us/library/office/ff866465%28v=office.14%29.aspx

Another great site to help you get started is http://www.cpearson.com/Excel/Topic.aspx

Moving everything over to VBA from VB.Net is not going to be simple since not all the data types are the same and you do not have the .Net framework. If you get stuck just post the code you're stuck converting and you will surely get some help!

Edit:

Sub ArrayExample()
    Dim subject As String
    Dim TestArray() As String
    Dim counter As Long

    subject = "Example"
    counter = Len(subject)

    ReDim TestArray(1 To counter) As String

    For counter = 1 To Len(subject)
        TestArray(counter) = Right(Left(subject, counter), 1)
    Next
End Sub

How to insert data into SQL Server

You have to set Connection property of Command object and use parametersized query instead of hardcoded SQL to avoid SQL Injection.

 using(SqlConnection openCon=new SqlConnection("your_connection_String"))
    {
      string saveStaff = "INSERT into tbl_staff (staffName,userID,idDepartment) VALUES (@staffName,@userID,@idDepartment)";

      using(SqlCommand querySaveStaff = new SqlCommand(saveStaff))
       {
         querySaveStaff.Connection=openCon;
         querySaveStaff.Parameters.Add("@staffName",SqlDbType.VarChar,30).Value=name;
         .....
         openCon.Open();

         querySaveStaff.ExecuteNonQuery();
       }
     }

Oracle JDBC intermittent Connection Issue

Disabling SQL Net Banners saved us.

Upload folder with subfolders using S3 and the AWS console

I was having problem with finding the enhanced uploader tool for uploading folder and subfolders inside it in S3. But rather than finding a tool I could upload the folders along with the subfolders inside it by simply dragging and dropping it in the S3 bucket.

Note: This drag and drop feature doesn't work in Safari. I've tested it in Chrome and it works just fine.

After you drag and drop the files and folders, this screen opens up finally to upload the content.

Eclipse projects not showing up after placing project files in workspace/projects

As I had imported my project from a "git clone", I had to select File->Import-> Git->Project from git -> Existing local repository

Delete statement in SQL is very slow

Is [COL] really a character field that's holding numbers, or can you get rid of the single-quotes around the values? @Alex is right that IN is slower than =, so if you can do this, you'll be better off:

DELETE FROM [table] WHERE [COL] = '1'

But better still is using numbers rather than strings to find the rows (sql likes numbers):

 DELETE FROM [table] WHERE [COL] = 1

Maybe try:

 DELETE FROM [table] WHERE CAST([COL] AS INT) = 1

In either event, make sure you have an index on column [COL] to speed up the table scan.

Using $setValidity inside a Controller

$setValidity needs to be called on the ngModelController. Inside the controller, I think that means $scope.myForm.file.$setValidity().

See also section "Custom Validation" on the Forms page, if you haven't already.

Also, for the first argument to $setValidity, use just 'filetype' and 'size'.

Correct file permissions for WordPress

I think the below rules are recommended for a default wordpress site:

For folders inside wp-content, set 0755 permissions:

chmod -R 0755 plugins

chmod -R 0755 uploads

chmod -R 0755 upgrade
Let apache user be the owner for the above directories of wp-content:

chown apache uploads

chown apache upgrade

chown apache plugins

curl: (6) Could not resolve host: google.com; Name or service not known

Perhaps you have some very weird and restrictive SELinux rules in place?

If not, try strace -o /tmp/wtf -fF curl -v google.com and try to spot from /tmp/wtf output file what's going on.

How to use a filter in a controller?

It seems nobody has mentioned that you can use a function as arg2 in $filter('filtername')(arg1,arg2);

For example:

$scope.filteredItems = $filter('filter')(items, function(item){return item.Price>50;});

How to set input type date's default value to today?

Since Date type only accepts the format "yyyy-MM-dd", you need to format the date value accordingly.

Here is the solution for this,

var d = new Date();
var month = d.getMonth();
var month_actual = month + 1;

if (month_actual < 10) {
  month_actual = "0"+month_actual; 
  }

var day_val = d.getDate();
if (day_val < 10) {
  day_val = "0"+day_val; 
  }

document.getElementById("datepicker_id").value = d.getFullYear()+"-"+ month_actual +"-"+day_val;

Git conflict markers

The line (or lines) between the lines beginning <<<<<<< and ====== here:

<<<<<<< HEAD:file.txt
Hello world
=======

... is what you already had locally - you can tell because HEAD points to your current branch or commit. The line (or lines) between the lines beginning ======= and >>>>>>>:

=======
Goodbye
>>>>>>> 77976da35a11db4580b80ae27e8d65caf5208086:file.txt

... is what was introduced by the other (pulled) commit, in this case 77976da35a11. That is the object name (or "hash", "SHA1sum", etc.) of the commit that was merged into HEAD. All objects in git, whether they're commits (version), blobs (files), trees (directories) or tags have such an object name, which identifies them uniquely based on their content.

Tokenizing Error: java.util.regex.PatternSyntaxException, dangling metacharacter '*'

It is because * is used as a metacharacter to signify one or more occurences of previous character. So if i write M* then it will look for files MMMMMM..... ! Here you are using * as the only character so the compiler is looking for the character to find multiple occurences of,so it throws the exception.:)

How to pass parameters to maven build using pom.xml?

mvn install "-Dsomeproperty=propety value"

In pom.xml:

<properties>
    <someproperty> ${someproperty} </someproperty>
</properties>

Referred from this question

SCRIPT5: Access is denied in IE9 on xmlhttprequest

Maybe you like to check the links below:

Unlimited Bash History

How to log SQL statements in Spring Boot?

For the MS-SQL server driver (Microsoft SQL Server JDBC Driver).

try using:

logging.level.com.microsoft.sqlserver.jdbc=debug

in your application.properties file.

My personal preference is to set:

logging.level.com.microsoft.sqlserver.jdbc=info
logging.level.com.microsoft.sqlserver.jdbc.internals=debug

You can look at these links for reference:

How to get a right click mouse event? Changing EventArgs to MouseEventArgs causes an error in Form1Designer?

This would definitely help Many!

private void axWindowsMediaPlayer1_ClickEvent(object sender, AxWMPLib._WMPOCXEvents_ClickEvent e)
    {
        if(e.nButton==2)
        {
            contextMenuStrip1.Show(MousePosition);
        }
    }

[ e.nbutton==2 ] is like [ e.button==MouseButtons.Right ]

Compilation error - missing zlib.h

You have installed the library in a non-standard location ($HOME/zlib/). That means the compiler will not know where your header files are and you need to tell the compiler that.

You can add a path to the list that the compiler uses to search for header files by using the -I (upper-case i) option.

Also note that the LD_LIBRARY_PATH is for the run-time linker and loader, and is searched for dynamic libraries when attempting to run an application. To add a path for the build-time linker use the -L option.

All-together the command line should look like

$ c++ -I$HOME/zlib/include some_file.cpp -L$HOME/zlib/lib -lz

How to remove the focus from a TextBox in WinForms?

using System.Windows.Input

Keyboard.ClearFocus();

How to implement my very own URI scheme on Android

As the question is asked years ago, and Android is evolved a lot on this URI scheme.
From original URI scheme, to deep link, and now Android App Links.

Android now recommends to use HTTP URLs, not define your own URI scheme. Because Android App Links use HTTP URLs that link to a website domain you own, so no other app can use your links. You can check the comparison of deep link and Android App links from here

Now you can easily add a URI scheme by using Android Studio option: Tools > App Links Assistant. Please refer the detail to Android document: https://developer.android.com/studio/write/app-link-indexing.html

Is it possible to add an HTML link in the body of a MAILTO link

I have implement following it working for iOS devices but failed on android devices

<a  href="mailto:?subject=Your mate might be interested...&body=<div style='padding: 0;'><div style='padding: 0;'><p>I found this on the site I think you might find it interesting.  <a href='@(Request.Url.ToString())' >Click here </a></p></div></div>">Share This</a>

Can I safely delete contents of Xcode Derived data folder?

yes, safe to delete, my script searches and nukes every instance it finds, easily modified to a local directory

#!/usr/bin/env bash
set -o errexit
set -o nounset
set -o pipefail
IFS=$'\n\t'

for drive in Swap Media OSX_10.11.6/$HOME
do
   pushd /Volumes/${drive}  &> /dev/null
   gfind . -depth -name 'DerivedData'|xargs -I '{}' /bin/rm -fR '{}'
   popd &> /dev/null
done

Calculate row means on subset of columns

Using dplyr:

library(dplyr)

# exclude ID column then get mean
DF %>%
  transmute(ID,
            Mean = rowMeans(select(., -ID)))

# select the columns to include in mean
DF %>%
  transmute(ID,
            Mean = rowMeans(select(., C1:C3)))

#   ID     Mean
# 1  A 3.666667
# 2  B 4.333333
# 3  C 3.333333
# 4  D 4.666667
# 5  E 4.333333

pandas GroupBy columns with NaN (missing) values

One small point to Andy Hayden's solution – it doesn't work (anymore?) because np.nan == np.nan yields False, so the replace function doesn't actually do anything.

What worked for me was this:

df['b'] = df['b'].apply(lambda x: x if not np.isnan(x) else -1)

(At least that's the behavior for Pandas 0.19.2. Sorry to add it as a different answer, I do not have enough reputation to comment.)

SQL - How to find the highest number in a column?

To get it at any time, you can do SELECT MAX(Id) FROM Customers .

In the procedure you add it in, however, you can also make use of SCOPE_IDENTITY -- to get the id last added by that procedure.
This is safer, because it will guarantee you get your Id--just in case others are being added to the database at the same time.

FPDF error: Some data has already been output, can't send PDF

For fpdf to work properly, there cannot be any output at all beside what fpdf generates. For example, this will work:

<?php
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
?>

While this will not (note the leading space before the opening <? tag)

 <?php
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
?>

Also, this will not work either (the echo will break it):

<?php
echo "About to create pdf";
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
?>

I'm not sure about the drupal side of things, but I know that absolutely zero non-fpdf output is a requirement for fpdf to work.

add ob_start (); at the top and at the end add ob_end_flush();

<?php
    ob_start();
    require('fpdf.php');
    $pdf = new FPDF();
    $pdf->AddPage();
    $pdf->SetFont('Arial','B',16);
    $pdf->Cell(40,10,'Hello World!');
    $pdf->Output();
    ob_end_flush(); 
?>

give me an error as below:
FPDF error: Some data has already been output, can't send PDF

to over come this error: go to fpdf.php in that,goto line number 996

function Output($name='', $dest='')

after that make changes like this:

function Output($name='', $dest='') {   
    ob_clean();     //Output PDF to so

Hi do you have a session header on the top of your page. or any includes If you have then try to add this codes on top pf your page it should works fine.

<?

while (ob_get_level())
ob_end_clean();
header("Content-Encoding: None", true);

?>

cheers :-)

In my case i had set:

ini_set('display_errors', 'on');
error_reporting(E_ALL | E_STRICT);

When i made the request to generate the report, some warnings were displayed in the browser (like the usage of deprecated functions).
Turning off the display_errors option, the report was generated successfully.

PHP returning JSON to JQUERY AJAX CALL

You can return json in PHP this way:

header('Content-Type: application/json');
echo json_encode(array('foo' => 'bar'));
exit;

How to do this using jQuery - document.getElementById("selectlist").value

It can be done by three different ways,though all them are nearly the same

Javascript way

document.getElementById('test').value

Jquery way

$("#test").val()          

$("#test")[0].value             

$("#test").get(0).value

Can media queries resize based on a div element instead of the screen?

I've just created a javascript shim to achieve this goal. Take a look if you want, it's a proof-of-concept, but take care: it's a early version and still needs some work.

https://github.com/marcj/css-element-queries

How to use a RELATIVE path with AuthUserFile in htaccess?

you may put your Auth settings into a Environment. Like:

SetEnvIf HTTP_HOST testsite.local APPLICATION_ENV=development
<IfDefine !APPLICATION_ENV>
  Allow from all
  AuthType Basic
  AuthName "My Testseite - Login" 
  AuthUserFile /Users/tho/htdocs/wgh_staging/.htpasswd
  Require user username
</IfDefine>

The Auth is working, but I couldn't get my environment really running.

Convert to date format dd/mm/yyyy

<?php
$test1='2010-04-19 18:31:27';
echo date('d/m/Y',strtotime($test1));
?>

try this

Pretty printing JSON from Jackson 2.2's ObjectMapper

If others who view this question only have a JSON string (not in an object), then you can put it into a HashMap and still get the ObjectMapper to work. The result variable is your JSON string.

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.HashMap;
import java.util.Map;

// Pretty-print the JSON result
try {
    ObjectMapper objectMapper = new ObjectMapper();
    Map<String, Object> response = objectMapper.readValue(result, HashMap.class);
    System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(response));
} catch (JsonParseException e) {
    e.printStackTrace();
} catch (JsonMappingException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

How to deploy a war file in JBoss AS 7?

Can you provide more info on the deployment failure? Is the application's failure to deploy triggering a .war.failed marker file?

The standalone instance Deployment folder ships with automatic deployment enabled by default. The automatic deployment mode automates the same functionality that you use with the manual mode, by using a series of marker files to indicate both the action and status of deployment to the runtime. For example, you can use the unix/linux "touch" command to create a .war.dodeploy marker file to tell the runtime to deploy the application.

It might be useful to know that there are in total five methods of deploying applications to AS7. I touched on this in another topic here : JBoss AS7 *.dodeploy files

I tend to use the Management Console for application management, but I know that the Management CLI is very popular among other uses also. Both are separate to the deployment folder processes. See how you go with the other methods to fit your needs.

If you search for "deploy" in the Admin Guide, you can see a section on the Deployment Scanner and a more general deployment section (including the CLI): https://docs.jboss.org/author/display/AS7/Admin+Guide

How to check if a std::string is set or not?

I don't think you can tell with the std::string class. However, if you really need this information, you could always derive a class from std::string and give the derived class the ability to tell if it had been changed since construction (or some other arbitrary time). Or better yet, just write a new class that wraps std::string since deriving from std::string may not be a good idea given the lack of a base class virtual destructor. That's probably more work, but more work tends to be needed for an optimal solution.

Of course, you can always just assume if it contains something other than "" then it has been "set", this won't detect it manually getting set to "" though.

Wildcards in a Windows hosts file

I found a posting about Using the Windows Hosts File that also says "No wildcards are allowed."

In the past, I have just added the additional entries to the hosts file, because (as previously said), it's not that much extra work when you already are editing the apache config file.

Unable to start Service Intent

I've found the same problem. I lost almost a day trying to start a service from OnClickListener method - outside the onCreate and after 1 day, I still failed!!!! Very frustrating! I was looking at the sample example RemoteServiceController. Theirs works, but my implementation does not work!

The only way that was working for me, was from inside onCreate method. None of the other variants worked and believe me I've tried them all.

Conclusion:

If you put your service class in different package than the mainActivity, I'll get all kind of errors
Also the one "/" couldn't find path to the service, tried starting with Intent(package,className) and nothing , also other type of Intent starting
I moved the service class in the same package of the activity Final form that works

Hopefully this helps someone by defining the listerners onClick inside the onCreate method like this:

public void onCreate() {
//some code......
    Button btnStartSrv  = (Button)findViewById(R.id.btnStartService);
    Button btnStopSrv  = (Button)findViewById(R.id.btnStopService);

    btnStartSrv.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            startService(new Intent("RM_SRV_AIDL"));
        }
    });

    btnStopSrv.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            stopService(new Intent("RM_SRV_AIDL"));
        }
    });

} // end onCreate

Also very important for the Manifest file, be sure that service is child of application:

<application ... >
    <activity ... >
     ...
    </activity>
    <service
        android:name="com.mainActivity.MyRemoteGPSService"
        android:label="GPSService"
        android:process=":remote">

        <intent-filter>
             <action android:name="RM_SRV_AIDL" />
        </intent-filter>
    </service>
</application>

Excel - programm cells to change colour based on another cell

Select ColumnB and as two CF formula rules apply:

Green: =AND(B1048576="X",B1="Y")

Red: =AND(B1048576="X",B1="W")

enter image description here

How do I pass a unique_ptr argument to a constructor or a function?

Base(Base::UPtr n):next(std::move(n)) {}

should be much better as

Base(Base::UPtr&& n):next(std::forward<Base::UPtr>(n)) {}

and

void setNext(Base::UPtr n)

should be

void setNext(Base::UPtr&& n)

with same body.

And ... what is evt in handle() ??

How do I know the script file name in a Bash script?

In bash you can get the script file name using $0. Generally $1, $2 etc are to access CLI arguments. Similarly $0 is to access the name which triggers the script(script file name).

#!/bin/bash
echo "You are running $0"
...
...

If you invoke the script with path like /path/to/script.sh then $0 also will give the filename with path. In that case need to use $(basename $0) to get only script file name.

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'

see if their duplicate jars or dependencies your adding remove it and your error will be gone: Eg: if you add android:supportv4 jar and also dependency you will get the error so remove the jar error will be gone

What is the preferred/idiomatic way to insert into a map?

If you want to overwrite the element with key 0

function[0] = 42;

Otherwise:

function.insert(std::make_pair(0, 42));

How to increase timeout for a single test case in mocha

If you are using in NodeJS then you can set timeout in package.json

"test": "mocha --timeout 10000"

then you can run using npm like:

npm test

Using PHP Replace SPACES in URLS with %20

I think you must use rawurlencode() instead urlencode() for your purpose.

sample

$image = 'some images.jpg';
$url   = 'http://example.com/'

With urlencode($str) will result

echo $url.urlencode($image); //http://example.com/some+images.jpg

its not change to %20 at all

but with rawurlencode($image) will produce

echo $url.rawurlencode(basename($image)); //http://example.com/some%20images.jpg

Tensorflow set CUDA_VISIBLE_DEVICES within jupyter

You can also enable multiple GPU cores, like so:

import os
os.environ["CUDA_DEVICE_ORDER"]="PCI_BUS_ID"
os.environ["CUDA_VISIBLE_DEVICES"]="0,2,3,4"

AngularJS : ng-click not working

For ng-click working properly you need define your controller after angularjs script binding and use it via $scope.

Mobile overflow:scroll and overflow-scrolling: touch // prevent viewport "bounce"

you could try

$('*').not('#div').bind('touchmove', false);

add this if necessary

$('#div').bind('touchmove');

note that everything is fixed except #div

How do I extract data from a DataTable?

You can set the datatable as a datasource to many elements.

For eg

gridView

repeater

datalist

etc etc

If you need to extract data from each row then you can use

table.rows[rowindex][columnindex]

if you know the column name

table.rows[rowindex][columnname]

If you need to iterate the table then you can either use a for loop or a foreach loop like

for ( int i = 0; i < table.rows.length; i ++ )
{
    string name = table.rows[i]["columnname"].ToString();
}

foreach ( DataRow dr in table.Rows )
{
    string name = dr["columnname"].ToString();
}

CSS selector for text input fields?

You can use the attribute selector here:

input[type="text"] {
    font-family: Arial, sans-serif;
}

This is supported in IE7 and above. You can use IE7.js to add support for this if you need to support IE6.

See: http://reference.sitepoint.com/css/attributeselector for more information

Make 2 functions run at the same time

The answer about threading is good, but you need to be a bit more specific about what you want to do.

If you have two functions that both use a lot of CPU, threading (in CPython) will probably get you nowhere. Then you might want to have a look at the multiprocessing module or possibly you might want to use jython/IronPython.

If CPU-bound performance is the reason, you could even implement things in (non-threaded) C and get a much bigger speedup than doing two parallel things in python.

Without more information, it isn't easy to come up with a good answer.

Django check for any exists for a query

As of Django 1.2, you can use exists():

https://docs.djangoproject.com/en/dev/ref/models/querysets/#exists

if some_queryset.filter(pk=entity_id).exists():
    print("Entry contained in queryset")

How to change value for innodb_buffer_pool_size in MySQL on Mac OS?

In the earlier versions of MySQL ( < 5.7.5 ) the only way to set

'innodb_buffer_pool_size'

variable was by writing it to my.cnf (for linux) and my.ini (for windows) under [mysqld] section :

[mysqld]

innodb_buffer_pool_size = 2147483648

You need to restart your mysql server to have it's effect in action.

UPDATE :

As of MySQL 5.7.5, the innodb_buffer_pool_size configuration option can be set dynamically using a SET statement, allowing you to resize the buffer pool without restarting the server. For example:
mysql> SET GLOBAL innodb_buffer_pool_size=402653184;

Reference : https://dev.mysql.com/doc/refman/5.7/en/innodb-buffer-pool-resize.html

Is there any quick way to get the last two characters in a string?

Use substring method like this::

str.substring(str.length()-2);

Remove characters from a String in Java

This will safely remove only if token is at end of string.

StringUtils.removeEnd(string, ".xml");

Apache StringUtils functions are null-, empty-, and no match- safe

Purpose of Unions in C and C++

As others mentioned, unions combined with enumerations and wrapped into structs can be used to implement tagged unions. One practical use is to implement Rust's Result<T, E>, which is originally implemented using a pure enum (Rust can hold additional data in enumeration variants). Here is a C++ example:

template <typename T, typename E> struct Result {
    public:
    enum class Success : uint8_t { Ok, Err };
    Result(T val) {
        m_success = Success::Ok;
        m_value.ok = val;
    }
    Result(E val) {
        m_success = Success::Err;
        m_value.err = val;
    }
    inline bool operator==(const Result& other) {
        return other.m_success == this->m_success;
    }
    inline bool operator!=(const Result& other) {
        return other.m_success != this->m_success;
    }
    inline T expect(const char* errorMsg) {
        if (m_success == Success::Err) throw errorMsg;
        else return m_value.ok;
    }
    inline bool is_ok() {
        return m_success == Success::Ok;
    }
    inline bool is_err() {
        return m_success == Success::Err;
    }
    inline const T* ok() {
        if (is_ok()) return m_value.ok;
        else return nullptr;
    }
    inline const T* err() {
        if (is_err()) return m_value.err;
        else return nullptr;
    }

    // Other methods from https://doc.rust-lang.org/std/result/enum.Result.html

    private:
    Success m_success;
    union _val_t { T ok; E err; } m_value;
}

How to hide navigation bar permanently in android activity?

Do this.

public void FullScreencall() {
    if(Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
        View v = this.getWindow().getDecorView();
        v.setSystemUiVisibility(View.GONE);
    } else if(Build.VERSION.SDK_INT >= 19) {
        //for new api versions.
        View decorView = getWindow().getDecorView();
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        decorView.setSystemUiVisibility(uiOptions);
    }
}

This works 100% and you can do same for lower API versions, even if it's a late answer I hope it will helps someone else.

If you want this to be permanent, just call FullscreenCall() inside your onResume() method.

Html.HiddenFor value property not getting set

The following will work in MVC 4

@Html.HiddenFor(x => x.CRN, new { @Value = "1" });

@Value property is case sensitive. You need a capital 'V' on @Value.

Here is my model

public int CRN { get; set; }

Here is what is output in html when you look in the browser

<input value="1" data-val="true" data-val-number="The field CRN must be a number." data-val-required="The CRN field is required." id="CRN" name="CRN" type="hidden" value="1"/>

Here is my method

[HttpPost]
public ActionResult MyMethod(MyViewModel viewModel)
{
  int crn = viewModel.CRN;
}

Programs & Examples On #Ckeditor

how to add or embed CKEditor in php page

CKEditor instance already exists

How can you integrate a custom file browser/uploader with CKEditor?

How do I set a value in CKEditor with Javascript?

CKEditor automatically strips classes from div

Turn off enclosing <p> tags in CKEditor 3.0

How can I get the content of CKEditor using JQuery?

CKEditor, Image Upload (filebrowserUploadUrl)

How to add a custom button to the toolbar that calls a JavaScript function?

Getting the textarea value of a ckeditor textarea with javascript

How to convert a data frame column to numeric type?

_csv.Error: field larger than field limit (131072)

How can I align two divs horizontally?

Qt c++ aggregate 'std::stringstream ss' has incomplete type and cannot be defined

Getting value of HTML text input

JavaScriptSerializer - JSON serialization of enum as string

PHP Checking if the current date is before or after a set date

Output data with no column headings using PowerShell

java SSL and cert keystore

Dart: mapping a list (list.map)

What is the difference between 'protected' and 'protected internal'?

Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?

INSTALL_FAILED_UPDATE_INCOMPATIBLE when I try to install compiled .apk on device

How can I make a .NET Windows Forms application that only runs in the System Tray?

How to convert an ArrayList containing Integers to primitive int array?

Pythonically add header to a csv file

c++ integer->std::string conversion. Simple function?

Composer Update Laravel

Why would you use Expression<Func<T>> rather than Func<T>?

How can I access localhost from another computer in the same network?

How to compare two columns in Excel (from different sheets) and copy values from a corresponding column if the first two columns match?

How to install Java 8 on Mac

Add tooltip to font awesome icon

Installing a local module using npm?

Row count on the Filtered data

Invoke-Command error "Parameter set cannot be resolved using the specified named parameters"

AngularJs .$setPristine to reset form

How do I print the type or class of a variable in Swift?

json_decode() expects parameter 1 to be string, array given

how to get the base url in javascript

Getting results between two dates in PostgreSQL

iPhone App Development on Ubuntu

How do you easily horizontally center a <div> using CSS?

How do I refresh a DIV content?

Python: Converting from ISO-8859-1/latin1 to UTF-8

A plain string

Decoding a iso8859-1 string - convert plain string to unicode

A little more illustration — with “Ä”

Encoding to UTF

Relationship between unicode and UTF and latin1

Unicode Exceptions

Further reading

psql: FATAL: database "<user>" does not exist

Convert ascii char[] to hexadecimal char[] in C

Oracle - How to create a materialized view with FAST REFRESH and JOINS

How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searched for?)

JOIN two SELECT statement results

How to select only date from a DATETIME field in MySQL?

List directory tree structure in python?

Why can templates only be implemented in the header file?

Cannot create Maven Project in eclipse

How to add a named sheet at the end of all Excel sheets?

How to save a new sheet in an existing excel file, using Pandas?

How to use Select2 with JSON via Ajax request?

How do I link object files in C? Fails with "Undefined symbols for architecture x86_64"

How to remove/delete a large file from commit history in Git repository?

Is there a shortcut to make a block comment in Xcode?

Sort a list of Class Instances Python

Output data from all columns in a dataframe in pandas

Python foreach equivalent

Install specific version using laravel installer

How to fix Invalid byte 1 of 1-byte UTF-8 sequence

Uncaught SyntaxError: Unexpected token :

Get latitude and longitude based on location name with Google Autocomplete API

C: socket connection timeout

How to create and use temporary table in oracle stored procedure?

How do I set a textbox's value using an anchor with jQuery?

When should the xlsm or xlsb formats be used?

How to convert JSON data into a Python object

init() got an unexpected keyword argument 'user'

Confused about str on list in Python