Programs & Examples On #Rsa key fingerprint

ssh: The authenticity of host 'hostname' can't be established

I solve the issue which gives below written error:
Error:
The authenticity of host 'XXX.XXX.XXX' can't be established.
RSA key fingerprint is 09:6c:ef:cd:55:c4:4f:ss:5a:88:46:0a:a9:27:83:89.

Solution:
1. install any openSSH tool.
2. run command ssh
3. it will ask for do u add this host like. accept YES.
4. This host will add in the known host list.
5. Now you are able to connect with this host.

This solution is working now......

Switch/toggle div (jQuery)

I used this way to do that for multiple blocks without conjuring new JavaScript code:

<a href="#" data-toggle="thatblock">Show/Hide Content</a>

<div id="thatblock" style="display: none">
  Here is some description that will appear when we click on the button
</div>

Then a JavaScript portion for all such cases:

$(function() {
  $('*[data-toggle]').click(function() {
    $('#'+$(this).attr('data-toggle')).toggle();
    return false;
  });
});

Add spaces between the characters of a string in Java?

This would work for inserting any character any particular position in your String.

public static String insertCharacterForEveryNDistance(int distance, String original, char c){
    StringBuilder sb = new StringBuilder();
    char[] charArrayOfOriginal = original.toCharArray();
    for(int ch = 0 ; ch < charArrayOfOriginal.length ; ch++){
        if(ch % distance == 0)
            sb.append(c).append(charArrayOfOriginal[ch]);
        else
            sb.append(charArrayOfOriginal[ch]);
    }
    return sb.toString();
}

Then call it like this

String result = InsertSpaces.insertCharacterForEveryNDistance(1, "5434567845678965", ' ');
        System.out.println(result);

How to query as GROUP BY in django?

The following module allows you to group Django models and still work with a QuerySet in the result: https://github.com/kako-nawao/django-group-by

For example:

from django_group_by import GroupByMixin

class BookQuerySet(QuerySet, GroupByMixin):
    pass

class Book(Model):
    title = TextField(...)
    author = ForeignKey(User, ...)
    shop = ForeignKey(Shop, ...)
    price = DecimalField(...)

class GroupedBookListView(PaginationMixin, ListView):
    template_name = 'book/books.html'
    model = Book
    paginate_by = 100

    def get_queryset(self):
        return Book.objects.group_by('title', 'author').annotate(
            shop_count=Count('shop'), price_avg=Avg('price')).order_by(
            'name', 'author').distinct()

    def get_context_data(self, **kwargs):
        return super().get_context_data(total_count=self.get_queryset().count(), **kwargs)

'book/books.html'

<ul>
{% for book in object_list %}
    <li>
        <h2>{{ book.title }}</td>
        <p>{{ book.author.last_name }}, {{ book.author.first_name }}</p>
        <p>{{ book.shop_count }}</p>
        <p>{{ book.price_avg }}</p>
    </li>
{% endfor %}
</ul>

The difference to the annotate/aggregate basic Django queries is the use of the attributes of a related field, e.g. book.author.last_name.

If you need the PKs of the instances that have been grouped together, add the following annotation:

.annotate(pks=ArrayAgg('id'))

NOTE: ArrayAgg is a Postgres specific function, available from Django 1.9 onwards: https://docs.djangoproject.com/en/1.10/ref/contrib/postgres/aggregates/#arrayagg

jQuery Validation using the class instead of the name value

You can add the rules based on that selector using .rules("add", options), just remove any rules you want class based out of your validate options, and after calling $(".formToValidate").validate({... });, do this:

$(".checkBox").rules("add", { 
  required:true,  
  minlength:3
});

How to get current time in milliseconds in PHP?

Use microtime. This function returns a string separated by a space. The first part is the fractional part of seconds, the second part is the integral part. Pass in true to get as a number:

var_dump(microtime());       // string(21) "0.89115400 1283846202"
var_dump(microtime(true));   // float(1283846202.89)

Beware of precision loss if you use microtime(true).

There is also gettimeofday that returns the microseconds part as an integer.

var_dump(gettimeofday());
/*
array(4) {
  ["sec"]=>
  int(1283846202)
  ["usec"]=>
  int(891199)
  ["minuteswest"]=>
  int(-60)
  ["dsttime"]=>
  int(1)
}
*/

Binding value to input in Angular JS

If you don't wan't to use ng-model there is ng-value you can try.

Here's the fiddle for this: http://jsfiddle.net/Rg9sG/1/

Calculating a directory's size using Python?

Using pathlib I came up this one-liner to get the size of a folder:

sum(file.stat().st_size for file in Path(folder).rglob('*'))

And this is what I came up with for a nicely formatted output:

from pathlib import Path


def get_folder_size(folder):
    return ByteSize(sum(file.stat().st_size for file in Path(folder).rglob('*')))


class ByteSize(int):

    _kB = 1024
    _suffixes = 'B', 'kB', 'MB', 'GB', 'PB'

    def __new__(cls, *args, **kwargs):
        return super().__new__(cls, *args, **kwargs)

    def __init__(self, *args, **kwargs):
        self.bytes = self.B = int(self)
        self.kilobytes = self.kB = self / self._kB**1
        self.megabytes = self.MB = self / self._kB**2
        self.gigabytes = self.GB = self / self._kB**3
        self.petabytes = self.PB = self / self._kB**4
        *suffixes, last = self._suffixes
        suffix = next((
            suffix
            for suffix in suffixes
            if 1 < getattr(self, suffix) < self._kB
        ), last)
        self.readable = suffix, getattr(self, suffix)

        super().__init__()

    def __str__(self):
        return self.__format__('.2f')

    def __repr__(self):
        return '{}({})'.format(self.__class__.__name__, super().__repr__())

    def __format__(self, format_spec):
        suffix, val = self.readable
        return '{val:{fmt}} {suf}'.format(val=val, fmt=format_spec, suf=suffix)

    def __sub__(self, other):
        return self.__class__(super().__sub__(other))

    def __add__(self, other):
        return self.__class__(super().__add__(other))

    def __mul__(self, other):
        return self.__class__(super().__mul__(other))

    def __rsub__(self, other):
        return self.__class__(super().__sub__(other))

    def __radd__(self, other):
        return self.__class__(super().__add__(other))

    def __rmul__(self, other):
        return self.__class__(super().__rmul__(other))   

Usage:

>>> size = get_folder_size("c:/users/tdavis/downloads")
>>> print(size)
5.81 GB
>>> size.GB
5.810891855508089
>>> size.gigabytes
5.810891855508089
>>> size.PB
0.005674699077644618
>>> size.MB
5950.353260040283
>>> size
ByteSize(6239397620)

I also came across this question, which has some more compact and probably more performant strategies for printing file sizes.

Formatting MM/DD/YYYY dates in textbox in VBA

Add something to track the length and allow you to do "checks" on whether the user is adding or subtracting text. This is currently untested but something similar to this should work (especially if you have a userform).

'add this to your userform or make it a static variable if it is not part of a userform
private oldLength as integer

Private Sub txtBoxBDayHim_Change()
    if ( oldlength > txboxbdayhim.textlength ) then
        oldlength =txtBoxBDayHim.textlength
        exit sub
    end if

    If txtBoxBDayHim.TextLength = 2 or txtBoxBDayHim.TextLength = 5 then
    txtBoxBDayHim.Text = txtBoxBDayHim.Text + "/"
    end if
    oldlength =txtBoxBDayHim.textlength
End Sub

How to delete node from XML file using C#

It may be easier to use XPath to locate the nodes that you wish to delete. This stackoverflow thread might give you some ideas.

In your case you will find the four nodes that you want using this expression:

XmlDocument doc = new XmlDocument();
doc.Load(fileName);
XmlNodeList nodes = doc.SelectNodes("//Setting[@name='File1']");

jQuery: find element by text

Rocket's answer doesn't work.

<div>hhhhhh
<div>This is a test</div>
<div>Another Div</div>
</div>

I simply modified his DEMO here and you can see the root DOM is selected.

$('div:contains("test"):last').css('background-color', 'red');

add ":last" selector in the code to fix this.

n-grams in python, four, five, six grams?

You can easily whip up your own function to do this using itertools:

from itertools import izip, islice, tee
s = 'spam and eggs'
N = 3
trigrams = izip(*(islice(seq, index, None) for index, seq in enumerate(tee(s, N))))
list(trigrams)
# [('s', 'p', 'a'), ('p', 'a', 'm'), ('a', 'm', ' '),
# ('m', ' ', 'a'), (' ', 'a', 'n'), ('a', 'n', 'd'),
# ('n', 'd', ' '), ('d', ' ', 'e'), (' ', 'e', 'g'),
# ('e', 'g', 'g'), ('g', 'g', 's')]

Null vs. False vs. 0 in PHP

null is null. false is false. Sad but true.

there's not much consistency in PHP (though it is improving on latest releases, there's too much backward compatibility). Despite the design wishing some consistency (outlined in the selected answer here), it all get confusing when you consider method returns that use false/null in not-so-easy to reason ways.

You will often see null being used when they are already using false for something. e.g. filter_input(). They return false if the variable fails the filter, and null if the variable does not exists (does not existing means it also failed the filter?)

Methods returning false/null/string/etc interchangeably is a hack when the author care about the type of failure, for example, with filter_input() you can check for ===false or ===null if you care why the validation failed. But if you don't it might be a pitfall as one might forget to add the check for ===null if they only remembered to write the test case for ===false. And most php unit test/coverage tools will not call your attention for the missing, untested code path!

Lastly, here's some fun with type juggling. not even including arrays or objects.

var_dump( 0<0 );        #bool(false)
var_dump( 1<0 );        #bool(false)
var_dump( -1<0 );       #bool(true)
var_dump( false<0 );    #bool(false)
var_dump( null<0 );     #bool(false)
var_dump( ''<0 );       #bool(false)
var_dump( 'a'<0 );      #bool(false)
echo "\n";
var_dump( !0 );        #bool(true)
var_dump( !1 );        #bool(false)
var_dump( !-1 );       #bool(false)
var_dump( !false );    #bool(true)
var_dump( !null );     #bool(true)
var_dump( !'' );       #bool(true)
var_dump( !'a' );      #bool(false)
echo "\n";
var_dump( false == 0 );        #bool(true)
var_dump( false == 1 );        #bool(false)
var_dump( false == -1 );       #bool(false)
var_dump( false == false );    #bool(true)
var_dump( false == null );     #bool(true)
var_dump( false == '' );       #bool(true)
var_dump( false == 'a' );      #bool(false)
echo "\n";
var_dump( null == 0 );        #bool(true)
var_dump( null == 1 );        #bool(false)
var_dump( null == -1 );       #bool(false)
var_dump( null == false );    #bool(true)
var_dump( null == null );     #bool(true)
var_dump( null == '' );       #bool(true)
var_dump( null == 'a' );      #bool(false)
echo "\n";
$a=0; var_dump( empty($a) );        #bool(true)
$a=1; var_dump( empty($a) );        #bool(false)
$a=-1; var_dump( empty($a) );       #bool(false)
$a=false; var_dump( empty($a) );    #bool(true)
$a=null; var_dump( empty($a) );     #bool(true)
$a=''; var_dump( empty($a) );       #bool(true)
$a='a'; var_dump( empty($a));      # bool(false)
echo "\n"; #new block suggested by @thehpi
var_dump( null < -1 ); #bool(true)
var_dump( null < 0 ); #bool(false)
var_dump( null < 1 ); #bool(true)
var_dump( -1 > true ); #bool(false)
var_dump( 0 > true ); #bool(false)
var_dump( 1 > true ); #bool(true)
var_dump( -1 > false ); #bool(true)
var_dump( 0 > false ); #bool(false)
var_dump( 1 > true ); #bool(true)

Set the value of an input field

If the field for whatever reason only has a name attribute and nothing else, you can try this:

document.getElementsByName("INPUTNAME")[0].value = "TEXT HERE";

VBA macro that search for file in multiple subfolders

I actually just found this today for something I'm working on. This will return file paths for all files in a folder and its subfolders.

Dim colFiles As New Collection
RecursiveDir colFiles, "C:\Users\Marek\Desktop\Makro\", "*.*", True
Dim vFile As Variant

For Each vFile In colFiles
     'file operation here or store file name/path in a string array for use later in the script
     filepath(n) = vFile
     filename = fso.GetFileName(vFile) 'If you want the filename without full path
     n=n+1
Next vFile


'These two functions are required
Public Function RecursiveDir(colFiles As Collection, strFolder As String, strFileSpec As String, bIncludeSubfolders As Boolean)
Dim strTemp As String
Dim colFolders As New Collection
Dim vFolderName As Variant
strFolder = TrailingSlash(strFolder)
strTemp = Dir(strFolder & strFileSpec)
Do While strTemp <> vbNullString
    colFiles.Add strFolder & strTemp
    strTemp = Dir
Loop
If bIncludeSubfolders Then

    strTemp = Dir(strFolder, vbDirectory)
    Do While strTemp <> vbNullString
        If (strTemp <> ".") And (strTemp <> "..") Then
            If (GetAttr(strFolder & strTemp) And vbDirectory) <> 0 Then
                colFolders.Add strTemp
            End If
        End If
        strTemp = Dir
    Loop
    'Call RecursiveDir for each subfolder in colFolders
    For Each vFolderName In colFolders
        Call RecursiveDir(colFiles, strFolder & vFolderName, strFileSpec, True)
    Next vFolderName
End If
End Function

Public Function TrailingSlash(strFolder As String) As String
If Len(strFolder) > 0 Then
    If Right(strFolder, 1) = "\" Then
        TrailingSlash = strFolder
    Else
        TrailingSlash = strFolder & "\"
    End If
End If
End Function

This is adapted from a post by Ammara Digital Image Solutions.(http://www.ammara.com/access_image_faq/recursive_folder_search.html).

Python base64 data decode

import base64
coded_string = '''Q5YACgA...'''
base64.b64decode(coded_string)

worked for me. At the risk of pasting an offensively-long result, I got:

>>> base64.b64decode(coded_string)
2: 'C\x96\x00\n\x00\x00\x00\x00C\x96\x00\x1b\x00\x00\x00\x00C\x96\x00-\x00\x00\x00\x00C\x96\x00?\x00\x00\x00\x00C\x96\x07M\x00\x00\x00\x00C\x96\x07_\x00\x00\x00\x00C\x96\x07p\x00\x00\x00\x00C\x96\x07\x82\x00\x00\x00\x00C\x96\x07\x94\x00\x00\x00\x00C\x96\x07\xa6Cq\xf0\x7fC\x96\x07\xb8DJ\x81\xc7C\x96\x07\xcaD\xa5\x9dtC\x96\x07\xdcD\xb6\x97\x11C\x96\x07\xeeD\x8b\x8flC\x96\x07\xffD\x03\xd4\xaaC\x96\x08\x11B\x05&\xdcC\x96\x08#\x00\x00\x00\x00C\x96\x085C\x0c\xc9\xb7C\x96\x08GCy\xc0\xebC\x96\x08YC\x81\xa4xC\x96\x08kC\x0f@\x9bC\x96\x08}\x00\x00\x00\x00C\x96\x08\x8e\x00\x00\x00\x00C\x96\x08\xa0\x00\x00\x00\x00C\x96\x08\xb2\x00\x00\x00\x00C\x96\x86\xf9\x00\x00\x00\x00C\x96\x87\x0b\x00\x00\x00\x00C\x96\x87\x1d\x00\x00\x00\x00C\x96\x87/\x00\x00\x00\x00C\x96\x87AA\x0b\xe7PC\x96\x87SCI\xf5gC\x96\x87eC\xd4J\xeaC\x96\x87wD\r\x17EC\x96\x87\x89D\x00F6C\x96\x87\x9bC\x9cg\xdeC\x96\x87\xadB\xd56\x0cC\x96\x87\xbf\x00\x00\x00\x00C\x96\x87\xd1\x00\x00\x00\x00C\x96\x87\xe3\x00\x00\x00\x00C\x96\x87\xf5\x00\x00\x00\x00C\x9cY}\x00\x00\x00\x00C\x9cY\x90\x00\x00\x00\x00C\x9cY\xa4\x00\x00\x00\x00C\x9cY\xb7\x00\x00\x00\x00C\x9cY\xcbC\x1f\xbd\xa3C\x9cY\xdeCCz{C\x9cY\xf1CD\x02\xa7C\x9cZ\x05C+\x9d\x97C\x9cZ\x18C\x03R\xe3C\x9cZ,\x00\x00\x00\x00C\x9cZ?
[stuff omitted as it exceeded SO's body length limits]
\xbb\x00\x00\x00\x00D\xc5!7\x00\x00\x00\x00D\xc5!\xb2\x00\x00\x00\x00D\xc7\x14x\x00\x00\x00\x00D\xc7\x14\xf6\x00\x00\x00\x00D\xc7\x15t\x00\x00\x00\x00D\xc7\x15\xf2\x00\x00\x00\x00D\xc7\x16pC5\x9f\xf9D\xc7\x16\xeeC[\xb5\xf5D\xc7\x17lCG\x1b;D\xc7\x17\xeaB\xe3\x0b\xa6D\xc7\x18h\x00\x00\x00\x00D\xc7\x18\xe6\x00\x00\x00\x00D\xc7\x19d\x00\x00\x00\x00D\xc7\x19\xe2\x00\x00\x00\x00D\xc7\xfe\xb4\x00\x00\x00\x00D\xc7\xff3\x00\x00\x00\x00D\xc7\xff\xb2\x00\x00\x00\x00D\xc8\x001\x00\x00\x00\x00'

What problem are you having, specifically?

Creating a procedure in mySql with parameters

(IN @brugernavn varchar(64)**)**,IN @password varchar(64))

The problem is the )

Error Installing Homebrew - Brew Command Not Found

You can use this:

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)" 

to install homebrew.

How to fast-forward a branch to head?

In your case, to fast-forward, run:

$ git merge --ff-only origin/master

This uses the --ff-only option of git merge, as the question specifically asks for "fast-forward".

Here is an excerpt from git-merge(1) that shows more fast-forward options:

--ff, --no-ff, --ff-only
    Specifies how a merge is handled when the merged-in history is already a descendant of the current history.  --ff is the default unless merging an annotated
    (and possibly signed) tag that is not stored in its natural place in the refs/tags/ hierarchy, in which case --no-ff is assumed.

    With --ff, when possible resolve the merge as a fast-forward (only update the branch pointer to match the merged branch; do not create a merge commit). When
    not possible (when the merged-in history is not a descendant of the current history), create a merge commit.

    With --no-ff, create a merge commit in all cases, even when the merge could instead be resolved as a fast-forward.

    With --ff-only, resolve the merge as a fast-forward when possible. When not possible, refuse to merge and exit with a non-zero status.

I fast-forward often enough that it warranted an alias:

$ git config --global alias.ff 'merge --ff-only @{upstream}'

Now I can run this to fast-forward:

$ git ff

Call fragment from fragment

In MainActivity

private static android.support.v4.app.FragmentManager fragmentManager;

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

    fragmentManager = getSupportFragmentManager();                                                                 


    }

public void secondFragment() {

    fragmentManager
            .beginTransaction()
            .setCustomAnimations(R.anim.right_enter, R.anim.left_out)
            .replace(R.id.frameContainer, new secondFragment(), "secondFragmentTag").addToBackStack(null)
            .commit();
}

In FirstFragment call SecondFrgment Like this:

new MainActivity().secondFragment();

Replace multiple characters in one replace call

You can just try this :

str.replace(/[.#]/g, 'replacechar');

this will replace .,- and # with your replacechar !

Sort objects in ArrayList by date?

Given MyObject that has a DateTime member with a getDateTime() method, you can sort an ArrayList that contains MyObject elements by the DateTime objects like this:

Collections.sort(myList, new Comparator<MyObject>() {
    public int compare(MyObject o1, MyObject o2) {
        return o1.getDateTime().lt(o2.getDateTime()) ? -1 : 1;
    }
});

Warning comparison between pointer and integer

In this line ...

if (*message == "\0") {

... as you can see in the warning ...

warning: comparison between pointer and integer
      ('int' and 'char *')

... you are actually comparing an int with a char *, or more specifically, an int with an address to a char.

To fix this, use one of the following:

if(*message == '\0') ...
if(message[0] == '\0') ...
if(!*message) ...

On a side note, if you'd like to compare strings you should use strcmp or strncmp, found in string.h.

Reducing video size with same format and reducing frame size

There is an application for both Mac & Windows call Handbrake, i know this isn't command line stuff but for a quick open file - select output file format & rough output size whilst keeping most of the good stuff about the video then this is good, it's a just a graphical view of ffmpeg at its best ... It does support command line input for those die hard texters.. https://handbrake.fr/downloads.php

Twitter bootstrap progress bar animation on page load

Bootstrap uses CSS3 transitions so progress bars are automatically animated when you set the width of .bar trough javascript / jQuery.

http://jsfiddle.net/3j5Je/ ..see?

"Could not find a valid gem in any repository" (rubygame and others)

You can also add the source you want on the command whenever you have troubles using https, like this:

gem install GEMNAME --source http://rubygems.org

It's better to fix the SSL problem though.

XPath:: Get following Sibling

You should be looking for the second tr that has the td that equals ' Color Digest ', then you need to look at either the following sibling of the first td in the tr, or the second td.

Try the following:

//tr[td='Color Digest'][2]/td/following-sibling::td[1]

or

//tr[td='Color Digest'][2]/td[2]

http://www.xpathtester.com/saved/76bb0bca-1896-43b7-8312-54f924a98a89

Simulate low network connectivity for Android

This may sound a little crazy, but a microwave oven serves as a microwave shield. Therefore, putting your device inside a microwave oven (DO NOT turn on the microwave oven while your device is inside!) will cause your signal strength to drop significantly. It definitely beats standing inside an elevator...

Uploading into folder in FTP?

The folder is part of the URL you set when you create request: "ftp://www.contoso.com/test.htm". If you use "ftp://www.contoso.com/wibble/test.htm" then the file will be uploaded to a folder named wibble.

You may need to first use a request with Method = WebRequestMethods.Ftp.MakeDirectory to make the wibble folder if it doesn't already exist.

Jquery Ajax, return success/error from mvc.net controller

 $.ajax({
    type: "POST",
    data: formData,
    url: "/Forms/GetJobData",
    dataType: 'json',
    contentType: false,
    processData: false,               
    success: function (response) {
        if (response.success) {
            alert(response.responseText);
        } else {
            // DoSomethingElse()
            alert(response.responseText);
        }                          
    },
    error: function (response) {
        alert("error!");  // 
    }

});

Controller:

[HttpPost]
public ActionResult GetJobData(Jobs jobData)
{
    var mimeType = jobData.File.ContentType;
    var isFileSupported = IsFileSupported(mimeType);

    if (!isFileSupported){        
         //  Send "false"
        return Json(new { success = false, responseText = "The attached file is not supported." }, JsonRequestBehavior.AllowGet);
    }
    else
    {
        //  Send "Success"
        return Json(new { success = true, responseText= "Your message successfuly sent!"}, JsonRequestBehavior.AllowGet);
    }   
}

---Supplement:---

basically you can send multiple parameters this way:

Controller:

 return Json(new { 
                success = true,
                Name = model.Name,
                Phone = model.Phone,
                Email = model.Email                                
            }, 
            JsonRequestBehavior.AllowGet);

Html:

<script> 
     $.ajax({
                type: "POST",
                url: '@Url.Action("GetData")',
                contentType: 'application/json; charset=utf-8',            
                success: function (response) {

                   if(response.success){ 
                      console.log(response.Name);
                      console.log(response.Phone);
                      console.log(response.Email);
                    }


                },
                error: function (response) {
                    alert("error!"); 
                }
            });

Binding ConverterParameter

There is also an alternative way to use MarkupExtension in order to use Binding for a ConverterParameter. With this solution you can still use the default IValueConverter instead of the IMultiValueConverter because the ConverterParameter is passed into the IValueConverter just like you expected in your first sample.

Here is my reusable MarkupExtension:

/// <summary>
///     <example>
///         <TextBox>
///             <TextBox.Text>
///                 <wpfAdditions:ConverterBindableParameter Binding="{Binding FirstName}"
///                     Converter="{StaticResource TestValueConverter}"
///                     ConverterParameterBinding="{Binding ConcatSign}" />
///             </TextBox.Text>
///         </TextBox>
///     </example>
/// </summary>
[ContentProperty(nameof(Binding))]
public class ConverterBindableParameter : MarkupExtension
{
    #region Public Properties

    public Binding Binding { get; set; }
    public BindingMode Mode { get; set; }
    public IValueConverter Converter { get; set; }
    public Binding ConverterParameter { get; set; }

    #endregion

    public ConverterBindableParameter()
    { }

    public ConverterBindableParameter(string path)
    {
        Binding = new Binding(path);
    }

    public ConverterBindableParameter(Binding binding)
    {
        Binding = binding;
    }

    #region Overridden Methods

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        var multiBinding = new MultiBinding();
        Binding.Mode = Mode;
        multiBinding.Bindings.Add(Binding);
        if (ConverterParameter != null)
        {
            ConverterParameter.Mode = BindingMode.OneWay;
            multiBinding.Bindings.Add(ConverterParameter);
        }
        var adapter = new MultiValueConverterAdapter
        {
            Converter = Converter
        };
        multiBinding.Converter = adapter;
        return multiBinding.ProvideValue(serviceProvider);
    }

    #endregion

    [ContentProperty(nameof(Converter))]
    private class MultiValueConverterAdapter : IMultiValueConverter
    {
        public IValueConverter Converter { get; set; }

        private object lastParameter;

        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (Converter == null) return values[0]; // Required for VS design-time
            if (values.Length > 1) lastParameter = values[1];
            return Converter.Convert(values[0], targetType, lastParameter, culture);
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            if (Converter == null) return new object[] { value }; // Required for VS design-time

            return new object[] { Converter.ConvertBack(value, targetTypes[0], lastParameter, culture) };
        }
    }
}

With this MarkupExtension in your code base you can simply bind the ConverterParameter the following way:

<Style TargetType="FrameworkElement">
<Setter Property="Visibility">
    <Setter.Value>
     <wpfAdditions:ConverterBindableParameter Binding="{Binding Tag, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type UserControl}"
                 Converter="{StaticResource AccessLevelToVisibilityConverter}"
                 ConverterParameterBinding="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Tag}" />          
    </Setter.Value>
</Setter>

Which looks almost like your initial proposal.

Subquery returned more than 1 value.This is not permitted when the subquery follows =,!=,<,<=,>,>= or when the subquery is used as an expression

Use In instead of =

 select * from dbo.books
 where isbn in (select isbn from dbo.lending 
                where act between @fdate and @tdate
                and stat ='close'
               )

or you can use Exists

SELECT t1.*,t2.*
FROM  books   t1 
WHERE  EXISTS ( SELECT * FROM dbo.lending t2 WHERE t1.isbn = t2.isbn and
                t2.act between @fdate and @tdate and t2.stat ='close' )

sorting dictionary python 3

The accepted answer definitely works, but somehow miss an important point.

The OP is asking for a dictionary sorted by it's keys this is just not really possible and not what OrderedDict is doing.

OrderedDict is maintaining the content of the dictionary in insertion order. First item inserted, second item inserted, etc.

>>> d = OrderedDict()
>>> d['foo'] = 1
>>> d['bar'] = 2
>>> d
OrderedDict([('foo', 1), ('bar', 2)])

>>> d = OrderedDict()
>>> d['bar'] = 2
>>> d['foo'] = 1
>>> d
OrderedDict([('bar', 2), ('foo', 1)])

Hencefore I won't really be able to sort the dictionary inplace, but merely to create a new dictionary where insertion order match key order. This is explicit in the accepted answer where the new dictionary is b.

This may be important if you are keeping access to dictionaries through containers. This is also important if you itend to change the dictionary later by adding or removing items: they won't be inserted in key order but at the end of dictionary.

>>> d = OrderedDict({'foo': 5, 'bar': 8})
>>> d
OrderedDict([('foo', 5), ('bar', 8)])
>>> d['alpha'] = 2
>>> d
OrderedDict([('foo', 5), ('bar', 8), ('alpha', 2)])

Now, what does mean having a dictionary sorted by it's keys ? That makes no difference when accessing elements by keys, this only matter when you are iterating over items. Making that a property of the dictionary itself seems like overkill. In many cases it's enough to sort keys() when iterating.

That means that it's equivalent to do:

>>> d = {'foo': 5, 'bar': 8}
>>> for k,v in d.iteritems(): print k, v

on an hypothetical sorted by key dictionary or:

>>> d = {'foo': 5, 'bar': 8}
>>> for k, v in iter((k, d[k]) for k in sorted(d.keys())): print k, v

Of course it is not hard to wrap that behavior in an object by overloading iterators and maintaining a sorted keys list. But it is likely overkill.

When to use Task.Delay, when to use Thread.Sleep?

My opinion,

Task.Delay() is asynchronous. It doesn't block the current thread. You can still do other operations within current thread. It returns a Task return type (Thread.Sleep() doesn't return anything ). You can check if this task is completed(use Task.IsCompleted property) later after another time-consuming process.

Thread.Sleep() doesn't have a return type. It's synchronous. In the thread, you can't really do anything other than waiting for the delay to finish.

As for real-life usage, I have been programming for 15 years. I have never used Thread.Sleep() in production code. I couldn't find any use case for it. Maybe that's because I mostly do web application development.

The operation couldn’t be completed. (com.facebook.sdk error 2.) ios6

I had the same issue and took a whole day to figure out the problem. This error message by Facebook SDK is very vague. I had this problem due to openURL: method being overwritten in MyApplication. I removed the overwritten method and facebook login worked fine.

'Linker command failed with exit code 1' when using Google Analytics via CocoaPods

Go to your build settings and switch the target's settings to ENABLE_BITCODE = YES for now.

ASP.NET MVC - Set custom IIdentity or IPrincipal

MVC provides you with the OnAuthorize method that hangs from your controller classes. Or, you could use a custom action filter to perform authorization. MVC makes it pretty easy to do. I posted a blog post about this here. http://www.bradygaster.com/post/custom-authentication-with-mvc-3.0

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

For CentOS, the file to init mysql is located here:

/etc/init.d/mysqld start

Formatting dates on X axis in ggplot2

Can you use date as a factor?

Yes, but you probably shouldn't.

...or should you use as.Date on a date column?

Yes.

Which leads us to this:

library(scales)
df$Month <- as.Date(df$Month)
ggplot(df, aes(x = Month, y = AvgVisits)) + 
  geom_bar(stat = "identity") +
  theme_bw() +
  labs(x = "Month", y = "Average Visits per User") +
  scale_x_date(labels = date_format("%m-%Y"))

enter image description here

in which I've added stat = "identity" to your geom_bar call.

In addition, the message about the binwidth wasn't an error. An error will actually say "Error" in it, and similarly a warning will always say "Warning" in it. Otherwise it's just a message.

Mongoose: findOneAndUpdate doesn't return updated document

So, "findOneAndUpdate" requires an option to return original document. And, the option is:

MongoDB shell

{returnNewDocument: true}

Ref: https://docs.mongodb.com/manual/reference/method/db.collection.findOneAndUpdate/

Mongoose

{new: true}

Ref: http://mongoosejs.com/docs/api.html#query_Query-findOneAndUpdate

Node.js MongoDB Driver API:

{returnOriginal: false}

Ref: http://mongodb.github.io/node-mongodb-native/3.0/api/Collection.html#findOneAndUpdate

How to show matplotlib plots in python

Save the plot as png

plt.savefig("temp.png")

Classpath resource not found when running as jar

If you want to use a file:

ClassPathResource classPathResource = new ClassPathResource("static/something.txt");

InputStream inputStream = classPathResource.getInputStream();
File somethingFile = File.createTempFile("test", ".txt");
try {
    FileUtils.copyInputStreamToFile(inputStream, somethingFile);
} finally {
    IOUtils.closeQuietly(inputStream);
}

jQuery - find table row containing table cell containing specific text

$(function(){
    var search = 'foo';
    $("table tr td").filter(function() {
        return $(this).text() == search;
    }).parent('tr').css('color','red');
});

Will turn the text red for rows which have a cell whose text is 'foo'.

Git on Windows: How do you set up a mergetool?

If anyone wants to use gvim as their diff tool on TortoiseGit, then this is what you need to enter into the text input for the path to the external diff tool:

path\to\gvim.exe -f -d -c "wincmd R" -c "wincmd R" -c "wincmd h" -c "wincmd J"

Pandas: Setting no. of max rows

As in this answer to a similar question, there is no need to hack settings. It is much simpler to write:

print(foo.to_string())

Change <select>'s option and trigger events with JavaScript

Fiddle of my solution is here. But just in case it expires I will paste the code as well.

HTML:

<select id="sel">
  <option value='1'>One</option>
  <option value='2'>Two</option>
  <option value='3'>Three</option>
</select>
<input type="button" id="button" value="Change option to 2" />

JS:

var sel = document.getElementById('sel'),
    button = document.getElementById('button');

button.addEventListener('click', function (e) {
    sel.options[1].selected = true;

    // firing the event properly according to StackOverflow
    // http://stackoverflow.com/questions/2856513/how-can-i-trigger-an-onchange-event-manually
    if ("createEvent" in document) {
        var evt = document.createEvent("HTMLEvents");
        evt.initEvent("change", false, true);
        sel.dispatchEvent(evt);
    }
    else {
        sel.fireEvent("onchange");
    }
});

sel.addEventListener('change', function (e) {
    alert('changed');
});

Can't access Eclipse marketplace

Go to the folder where eclipse is installed

open eclipse.ini file
look for the line -vmargs
put -Djava.net.preferIPv4Stack=true below the -vmargs line and restart eclipse

Remove spaces from std::string in C++

In C++20 you can use free function std::erase

std::string str = " Hello World  !";
std::erase(str, ' ');

Full example:

#include<string>
#include<iostream>

int main() {
    std::string str = " Hello World  !";
    std::erase(str, ' ');
    std::cout << "|" << str <<"|";
}

I print | so that it is obvious that space at the begining is also removed.

note: this removes only the space, not every other possible character that may be considered whitespace, see https://en.cppreference.com/w/cpp/string/byte/isspace

String strip() for JavaScript?

Use this:

if(typeof(String.prototype.trim) === "undefined")
{
    String.prototype.trim = function() 
    {
        return String(this).replace(/^\s+|\s+$/g, '');
    };
}

The trim function will now be available as a first-class function on your strings. For example:

" dog".trim() === "dog" //true

EDIT: Took J-P's suggestion to combine the regex patterns into one. Also added the global modifier per Christoph's suggestion.

Took Matthew Crumley's idea about sniffing on the trim function prior to recreating it. This is done in case the version of JavaScript used on the client is more recent and therefore has its own, native trim function.

TextView - setting the text size programmatically doesn't seem to work

This fixed the issue for me. I got uniform font size across all devices.

 textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,getResources().getDimension(R.dimen.font));

How can I strip first and last double quotes?

If you can't assume that all the strings you process have double quotes you can use something like this:

if string.startswith('"') and string.endswith('"'):
    string = string[1:-1]

Edit:

I'm sure that you just used string as the variable name for exemplification here and in your real code it has a useful name, but I feel obliged to warn you that there is a module named string in the standard libraries. It's not loaded automatically, but if you ever use import string make sure your variable doesn't eclipse it.

Where does linux store my syslog?

syslog() generates a log message, which will be distributed by syslogd.

The file to configure syslogd is /etc/syslog.conf. This file will tell your where the messages are logged.

How to change options in this file ? Here you go http://www.bo.infn.it/alice/alice-doc/mll-doc/duix/admgde/node74.html

Java Refuses to Start - Could not reserve enough space for object heap

You need to look at upgrading your OS and Java. Java 5.0 is EOL but if you cannot update to Java 6, you could use the latest patch level 22!

32-bit Windows is limited to ~ 1.3 GB so you are doing well to se the maximum to 1.8. Note: this is a problem with continous memory, and as your system runs its memory space can get fragmented so it does not suprise me you have this problem.

A 64-bit OS, doesn't have this problem as it has much more virtual space, you don't even have to upgrade to a 64-bit version of java to take advantage of this.

BTW, in my experience, 32-bit Java 5.0 can be faster than 64-bit Java 5.0. It wasn't until many years later that Java 6 update 10 was faster for 64-bit.

ADB Install Fails With INSTALL_FAILED_TEST_ONLY

Android 3.6.2.

Build >> Build/Bundle apk >> Build apk

Its working fine.enter image description here

How to use __doPostBack()

This is how I do it

    public void B_ODOC_OnClick(Object sender, EventArgs e)
    {
        string script="<script>__doPostBack(\'fileView$ctl01$OTHDOC\',\'{\"EventArgument\":\"OpenModal\",\"EncryptedData\":null}\');</script>";
        Page.ClientScript.RegisterStartupScript(this.GetType(),"JsOtherDocuments",script);               
    }

Python: How to remove empty lists from a list?

a = [[1,'aa',3,12,'a','b','c','s'],[],[],[1,'aa',7,80,'d','g','f',''],[9,None,11,12,13,14,15,'k']]

b=[]
for lng in range(len(a)):
       if(len(a[lng])>=1):b.append(a[lng])
a=b
print(a)

Output:

[[1,'aa',3,12,'a','b','c','s'],[1,'aa',7,80,'d','g','f',''],[9,None,11,12,13,14,15,'k']]

setOnItemClickListener on custom ListView

If above answers don't work maybe you didn't add return value into getItem method in the custom adapter see this question and check out first answer.

HTML form with side by side input fields

You should put the input for the last name into the same div where you have the first name.

<div>
    <label for="username">First Name</label>
    <input id="user_first_name" name="user[first_name]" size="30" type="text" />
    <input id="user_last_name" name="user[last_name]" size="30" type="text" />
</div>

Then, in your CSS give your #user_first_name and #user_last_name height and float them both to the left. For example:

#user_first_name{
    max-width:100px; /*max-width for responsiveness*/
    float:left;
}

#user_lastname_name{
    max-width:100px;
    float:left;
}

C++ convert string to hexadecimal and vice versa

I think there is a much simpler and more elegant solution. Some of the above-mentioned methods may even throw unhandled exceptions in some cases. Here is a fool-proof (as in never goes wrong) and very fast code. Just try it and compare the results in terms of speed and compactness:

#include <string>

// Convert string of chars to its representative string of hex numbers
void stream2hex(const std::string str, std::string& hexstr, bool capital = false)
{
    hexstr.resize(str.size() * 2);
    const size_t a = capital ? 'A' - 1 : 'a' - 1;

    for (size_t i = 0, c = str[0] & 0xFF; i < hexstr.size(); c = str[i / 2] & 0xFF)
    {
        hexstr[i++] = c > 0x9F ? (c / 16 - 9) | a : c / 16 | '0';
        hexstr[i++] = (c & 0xF) > 9 ? (c % 16 - 9) | a : c % 16 | '0';
    }
}

// Convert string of hex numbers to its equivalent char-stream
void hex2stream(const std::string hexstr, std::string& str)
{
    str.resize((hexstr.size() + 1) / 2);

    for (size_t i = 0, j = 0; i < str.size(); i++, j++)
    {
        str[i] = (hexstr[j] & '@' ? hexstr[j] + 9 : hexstr[j]) << 4, j++;
        str[i] |= (hexstr[j] & '@' ? hexstr[j] + 9 : hexstr[j]) & 0xF;
    }
}

Test the code:

#include <iostream>
int main()
{
    std::string s = "Hello World!";
    std::cout << "original string: " << s << '\n';
    stream2hex(s, s);
    std::cout << "hex format: " << s << '\n';
    hex2stream(s, s);
    std::cout << "original one: " << s << '\n';
}

and the result is:

original string: Hello World!
hex format: 48656C6C6F20576F726C6421
original one: Hello World!

What is a Python egg?

Python eggs are a way of bundling additional information with a Python project, that allows the project's dependencies to be checked and satisfied at runtime, as well as allowing projects to provide plugins for other projects. There are several binary formats that embody eggs, but the most common is '.egg' zipfile format, because it's a convenient one for distributing projects. All of the formats support including package-specific data, project-wide metadata, C extensions, and Python code.

The easiest way to install and use Python eggs is to use the "Easy Install" Python package manager, which will find, download, build, and install eggs for you; all you do is tell it the name (and optionally, version) of the Python project(s) you want to use.

Python eggs can be used with Python 2.3 and up, and can be built using the setuptools package (see the Python Subversion sandbox for source code, or the EasyInstall page for current installation instructions).

The primary benefits of Python Eggs are:

  • They enable tools like the "Easy Install" Python package manager

  • .egg files are a "zero installation" format for a Python package; no build or install step is required, just put them on PYTHONPATH or sys.path and use them (may require the runtime installed if C extensions or data files are used)

  • They can include package metadata, such as the other eggs they depend on

  • They allow "namespace packages" (packages that just contain other packages) to be split into separate distributions (e.g. zope., twisted., peak.* packages can be distributed as separate eggs, unlike normal packages which must always be placed under the same parent directory. This allows what are now huge monolithic packages to be distributed as separate components.)

  • They allow applications or libraries to specify the needed version of a library, so that you can e.g. require("Twisted-Internet>=2.0") before doing an import twisted.internet.

  • They're a great format for distributing extensions or plugins to extensible applications and frameworks (such as Trac, which uses eggs for plugins as of 0.9b1), because the egg runtime provides simple APIs to locate eggs and find their advertised entry points (similar to Eclipse's "extension point" concept).

There are also other benefits that may come from having a standardized format, similar to the benefits of Java's "jar" format.

Change the column label? e.g.: change column "A" to column "Name"

If you intend to change A, B, C.... you see high above the columns, you can not. You can hide A, B, C...: Button Office(top left) Excel Options(bottom) Advanced(left) Right looking: Display options fot this worksheet: Select the worksheet(eg. Sheet3) Uncheck: Show column and row headers Ok

How line ending conversions work with git core.autocrlf between different operating systems

Did some tests both on linux and windows. I use a test file containing lines ending in LF and also lines ending in CRLF.
File is committed , removed and then checked out. The value of core.autocrlf is set before commit and also before checkout. The result is below.

commit core.autocrlf false, remove, checkout core.autocrlf false: LF=>LF   CRLF=>CRLF  
commit core.autocrlf false, remove, checkout core.autocrlf input: LF=>LF   CRLF=>CRLF  
commit core.autocrlf false, remove, checkout core.autocrlf true : LF=>LF   CRLF=>CRLF  
commit core.autocrlf input, remove, checkout core.autocrlf false: LF=>LF   CRLF=>LF  
commit core.autocrlf input, remove, checkout core.autocrlf input: LF=>LF   CRLF=>LF  
commit core.autocrlf input, remove, checkout core.autocrlf true : LF=>CRLF CRLF=>CRLF  
commit core.autocrlf true, remove, checkout core.autocrlf false: LF=>LF   CRLF=>LF  
commit core.autocrlf true, remove, checkout core.autocrlf input: LF=>LF   CRLF=>LF  
commit core.autocrlf true,  remove, checkout core.autocrlf true : LF=>CRLF CRLF=>CRLF  

Check if an array is empty or exists

Using undescore or lodash:

_.isArray(image_array) && !_.isEmpty(image_array)

Failed to load ApplicationContext from Unit Test: FileNotFound

If you are using intellij, then try restarting intellij cache

  1. File-> Invalidate cache/restart
  2. clean and build project

See if it works, it worked for me.

How can I find the number of elements in an array?

Super easy.

Just divide the number of allocated bytes by the number of bytes of the array's data type using sizeof().

For example, given an integer array called myArray

int numArrElements = sizeof(myArray) / sizeof(int);

Now, if the data type of your array isn't constant and could possibly change, make the divisor in the equation use the size of the first value as the size of the data type

For example:

int numArrElements = sizeof(myArray) / sizeof(myArray[0]);

change array size

No, try using a strongly typed List instead.

For example:

Instead of using

int[] myArray = new int[2];
myArray[0] = 1;
myArray[1] = 2;

You could do this:

List<int> myList = new List<int>();
myList.Add(1);
myList.Add(2);

Lists use arrays to store the data so you get the speed benefit of arrays with the convenience of a LinkedList by being able to add and remove items without worrying about having to manually change its size.

This doesn't mean an array's size (in this instance, a List) isn't changed though - hence the emphasis on the word manually.

As soon as your array hits its predefined size, the JIT will allocate a new array on the heap that is twice the size and copy your existing array across.

When using Trusted_Connection=true and SQL Server authentication, will this affect performance?

Not 100% sure what you mean:

Trusted_Connection=True;

IS using Windows credentials and is 100% equivalent to:

Integrated Security=SSPI;

or

Integrated Security=true;

If you don't want to use integrated security / trusted connection, you need to specify user id and password explicitly in the connection string (and leave out any reference to Trusted_Connection or Integrated Security)

server=yourservername;database=yourdatabase;user id=YourUser;pwd=TopSecret

Only in this case, the SQL Server authentication mode is used.

If any of these two settings is present (Trusted_Connection=true or Integrated Security=true/SSPI), then the Windows credentials of the current user are used to authenticate against SQL Server and any user iD= setting will be ignored and not used.

For reference, see the Connection Strings site for SQL Server 2005 with lots of samples and explanations.

Using Windows Authentication is the preferred and recommended way of doing things, but it might incur a slight delay since SQL Server would have to authenticate your credentials against Active Directory (typically). I have no idea how much that slight delay might be, and I haven't found any references for that.


Summing up:

If you specify either Trusted_Connection=True; or Integrated Security=SSPI; or Integrated Security=true; in your connection string

==> THEN (and only then) you have Windows Authentication happening. Any user id= setting in the connection string will be ignored.


If you DO NOT specify either of those settings,

==> then you DO NOT have Windows Authentication happening (SQL Authentication mode will be used)


jQuery checkbox onChange

There is no need to use :checkbox, also replace #activelist with #inactivelist:

$('#inactivelist').change(function () {
    alert('changed');
 });

Comprehensive beginner's virtualenv tutorial?

Virtualenv is a tool to create isolated Python environments.

Let's say you're working in 2 different projects, A and B. Project A is a web project and the team is using the following packages:

  • Python 2.8.x
  • Django 1.6.x

The project B is also a web project but your team is using:

  • Python 2.7.x
  • Django 1.4.x

The machine that you're working doesn't have any version of django, what should you do? Install django 1.4? django 1.6? If you install django 1.4 globally would be easy to point to django 1.6 to work in project A?

Virtualenv is your solution! You can create 2 different virtualenv's, one for project A and another for project B. Now, when you need to work in project A, just activate the virtualenv for project A, and vice-versa.

A better tip when using virtualenv is to install virtualenvwrapper to manage all the virtualenv's that you have, easily. It's a wrapper for creating, working, removing virtualenv's.

What's the difference between size_t and int in C++?

The definition of SIZE_T is found at: https://msdn.microsoft.com/en-us/library/cc441980.aspx and https://msdn.microsoft.com/en-us/library/cc230394.aspx

Pasting here the required information:

SIZE_T is a ULONG_PTR representing the maximum number of bytes to which a pointer can point.

This type is declared as follows:

typedef ULONG_PTR SIZE_T;

A ULONG_PTR is an unsigned long type used for pointer precision. It is used when casting a pointer to a long type to perform pointer arithmetic.

This type is declared as follows:

typedef unsigned __int3264 ULONG_PTR;

How to send emails from my Android application?

I solved this issue with simple lines of code as the android documentation explains.

(https://developer.android.com/guide/components/intents-common.html#Email)

The most important is the flag: it is ACTION_SENDTO, and not ACTION_SEND

The other important line is

intent.setData(Uri.parse("mailto:")); ***// only email apps should handle this***

By the way, if you send an empty Extra, the if() at the end won't work and the app won't launch the email client.

According to Android documentation. If you want to ensure that your intent is handled only by an email app (and not other text messaging or social apps), then use the ACTION_SENDTO action and include the "mailto:" data scheme. For example:

public void composeEmail(String[] addresses, String subject) {
    Intent intent = new Intent(Intent.ACTION_SENDTO);
    intent.setData(Uri.parse("mailto:")); // only email apps should handle this
    intent.putExtra(Intent.EXTRA_EMAIL, addresses);
    intent.putExtra(Intent.EXTRA_SUBJECT, subject);
    if (intent.resolveActivity(getPackageManager()) != null) {
        startActivity(intent);
    }
}

How do I convert csv file to rdd

A simplistic approach would be to have a way to preserve the header.

Let's say you have a file.csv like:

user, topic, hits
om,  scala, 120
daniel, spark, 80
3754978, spark, 1

We can define a header class that uses a parsed version of the first row:

class SimpleCSVHeader(header:Array[String]) extends Serializable {
  val index = header.zipWithIndex.toMap
  def apply(array:Array[String], key:String):String = array(index(key))
}

That we can use that header to address the data further down the road:

val csv = sc.textFile("file.csv")  // original file
val data = csv.map(line => line.split(",").map(elem => elem.trim)) //lines in rows
val header = new SimpleCSVHeader(data.take(1)(0)) // we build our header with the first line
val rows = data.filter(line => header(line,"user") != "user") // filter the header out
val users = rows.map(row => header(row,"user")
val usersByHits = rows.map(row => header(row,"user") -> header(row,"hits").toInt)
...

Note that the header is not much more than a simple map of a mnemonic to the array index. Pretty much all this could be done on the ordinal place of the element in the array, like user = row(0)

PS: Welcome to Scala :-)

Add event handler for body.onload by javascript within <body> part

body.addEventListener("load", init(), false);

That init() is saying run this function now and assign whatever it returns to the load event.

What you want is to assign the reference to the function, not the result. So you need to drop the ().

body.addEventListener("load", init, false);

Also you should be using window.onload and not body.onload

addEventListener is supported in most browsers except IE 8.

Count of "Defined" Array Elements

If the undefined's are implicit then you can do:

var len = 0;
for (var i in arr) { len++ };

undefined's are implicit if you don't set them explicitly

//both are a[0] and a[3] are explicit undefined
var arr = [undefined, 1, 2, undefined];

arr[6] = 3;
//now arr[4] and arr[5] are implicit undefined

delete arr[1]
//now arr[1] is implicit undefined

arr[2] = undefined
//now arr[2] is explicit undefined

Reverse of JSON.stringify?

Recommended is to use JSON.parse

There is an alternative you can do :

 var myObject = eval('(' + myJSONtext + ')');

Json in javascript

Why is using the JavaScript eval function a bad idea?

apt-get for Cygwin?

Update: you can read the more complex answer, which contains more methods and information.

There exists a couple of scripts, which can be used as simple package managers. But as far as I know, none of them allows you to upgrade packages, because it’s not an easy task on Windows since there is not possible to overwrite files in use. So you have to close all Cygwin instances first and then you can use Cygwin’s native setup.exe (which itself does the upgrade via “replace after reboot” method, when files are in use).


apt-cyg

The best one for me. Simply because it’s one of the most recent. It works correctly for both platforms - x86 and x86_64. There exists a lot of forks with some additional features. For example the kou1okada fork is one of improved versions.


Cygwin’s setup.exe

It has also command line mode. Moreover it allows you to upgrade all installed packages at once.

setup.exe-x86_64.exe -q --packages=bash,vim

Example use:

setup.exe-x86_64.exe -q --packages="bash,vim"

You can create an alias for easier use, for example:

alias cyg-get="/cygdrive/d/path/to/cygwin/setup-x86_64.exe -q -P"

Then you can for example install the Vim package with:

cyg-get vim

Powershell: A positional parameter cannot be found that accepts argument "xxx"

In my case there was a corrupted character in one of the named params ("-StorageAccountName" for cmdlet "Get-AzureStorageKey") which showed as perfectly normal in my editor (SublimeText) but Windows Powershell couldn't parse it.

To get to the bottom of it, I moved the offending lines from the error message into another .ps1 file, ran that, and the error now showed a botched character at the beginning of my "-StorageAccountName" parameter.

Deleting the character (again which looks normal in the actual editor) and re-typing it fixes this issue.

Webclient / HttpWebRequest with Basic Authentication returns 404 not found for valid URL

Try changing the Web Client request authentication part to:

NetworkCredential myCreds = new NetworkCredential(userName, passWord);
client.Credentials = myCreds;

Then make your call, seems to work fine for me.

Getting all names in an enum as a String[]

Create a String[] array for the names and call the static values() method which returns all the enum values, then iterate over the values and populate the names array.

public static String[] names() {
    State[] states = values();
    String[] names = new String[states.length];

    for (int i = 0; i < states.length; i++) {
        names[i] = states[i].name();
    }

    return names;
}

What are the main performance differences between varchar and nvarchar SQL Server data types?

Disk space is not the issue... but memory and performance will be. Double the page reads, double index size, strange LIKE and = constant behaviour etc

Do you need to store Chinese etc script? Yes or no...

And from MS BOL "Storage and Performance Effects of Unicode"

Edit:

Recent SO question highlighting how bad nvarchar performance can be...

SQL Server uses high CPU when searching inside nvarchar strings

Write to file, but overwrite it if it exists

#!/bin/bash

cat <<EOF > SampleFile

Put Some text here 
Put some text here
Put some text here

EOF

customize Android Facebook Login button

You can use styles for modifiy the login button like this

<style name="FacebookLoginButton">
    <item name="android:textSize">@dimen/smallTxtSize</item>
    <item name="android:background">@drawable/facebook_signin_btn</item>
    <item name="android:layout_marginTop">10dp</item>
    <item name="android:layout_marginBottom">10dp</item>
    <item name="android:layout_gravity">center_horizontal</item>
</style>

and in layout

<com.facebook.widget.LoginButton
        xmlns:fb="http://schemas.android.com/apk/res-auto"
        android:id="@+id/loginFacebookButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        fb:login_text="@string/loginFacebookButton"
        fb:logout_text=""
        style="@style/FacebookLoginButton"/>

Importing PNG files into Numpy?

I like the build-in pathlib libary because of quick options like directory= Path.cwd() Together with opencv it's quite easy to read pngs to numpy arrays. In this example you can even check the prefix of the image.

from pathlib import Path
import cv2
prefix = "p00"
suffix = ".png"
directory= Path.cwd()
file_names= [subp.name for subp in directory.rglob('*') if  (prefix in subp.name) & (suffix == subp.suffix)]
file_names.sort()
print(file_names)

all_frames= []
for file_name in file_names:
    file_path = str(directory / file_name)
    frame=cv2.imread(file_path)
    all_frames.append(frame)
print(type(all_frames[0]))
print(all_frames[0] [1][1])

Output:

['p000.png', 'p001.png', 'p002.png', 'p003.png', 'p004.png', 'p005.png', 'p006.png', 'p007.png', 'p008.png', 'p009.png']
<class 'numpy.ndarray'>
[255 255 255]

SQL Server Creating a temp table for this query

IF OBJECT_ID('tempdb..#MyTempTable') IS NOT NULL DROP TABLE #MyTempTable

CREATE TABLE #MyTempTable (SiteName varchar(50), BillingMonth varchar(10), Consumption float)

INSERT INTO #MyTempTable (SiteName, BillingMonth, Consumption)
SELECT  tblMEP_Sites.Name AS SiteName, convert(varchar(10),BillingMonth ,101)
AS BillingMonth, SUM(Consumption) AS Consumption
FROM tblMEP_Projects.......

Unfortunately MyApp has stopped. How can I solve this?

You can use Google's ADB tool to get Logcat file to analyze the issue.

adb logcat > logcat.txt

open logcat.txt file and search for your application name. There should be information on why it failed, the line number, Class name, etc.

cast a List to a Collection

Not knowing your code, it's a bit hard to answer your question, but based on all the info here, I believe the issue is you're trying to use Collections.sort passing in an object defined as Collection, and sort doesn't support that.

First question. Why is client defined so generically? Why isn't it a List, Map, Set or something a little more specific?

If client was defined as a List, Map or Set, you wouldn't have this issue, as then you'd be able to directly use Collections.sort(client).

HTH

youtube: link to display HD video by default

Nick Vogt at H3XED posted this syntax: https://www.youtube.com/v/VIDEOID?version=3&vq=hd1080

Take this link and replace the expression "VIDEOID" with the (shortened/shared) ID of the video.

Exapmple for ID: i3jNECZ3ybk looks like this: ... /v/i3jNECZ3ybk?version=3&vq=hd1080

What you get as a result is the standalone 1080p video but not in the Tube environment.

Microsoft Web API: How do you do a Server.MapPath?

You can try like:

var path="~/Image/test.png"; System.Web.Hosting.HostingEnvironment.MapPath( @ + path)

How can I perform a short delay in C# without using sleep?

You can probably use timers : http://msdn.microsoft.com/en-us/library/system.timers.timer.aspx

Timers can provide you a precision up to 1 millisecond. Depending on the tick interval an event will be generated. Do your stuff inside the tick event.

if else statement in AngularJS templates

    <div ng-if="modeldate==''"><span ng-message="required" class="change">Date is required</span> </div>

you can use the ng-if directive as above.

How to set focus on an input field after rendering?

Focus on mount

If you just want to focus an element when it mounts (initially renders) a simple use of the autoFocus attribute will do.

<input type="text" autoFocus />

Dynamic focus

to control focus dynamically use a general function to hide implementation details from your components.

React 16.8 + Functional component - useFocus hook

const FocusDemo = () => {

    const [inputRef, setInputFocus] = useFocus()

    return (
        <> 
            <button onClick={setInputFocus} >
               FOCUS
            </button>
            <input ref={inputRef} />
        </>
    )
    
}

const useFocus = () => {
    const htmlElRef = useRef(null)
    const setFocus = () => {htmlElRef.current &&  htmlElRef.current.focus()}

    return [ htmlElRef, setFocus ] 
}

Full Demo

React 16.3 + Class Components - utilizeFocus

class App extends Component {
  constructor(props){
    super(props)
    this.inputFocus = utilizeFocus()
  }

  render(){
    return (
      <> 
          <button onClick={this.inputFocus.setFocus}>
             FOCUS
          </button>
          <input ref={this.inputFocus.ref}/>
      </>
    )
  } 
}
const utilizeFocus = () => {
    const ref = React.createRef()
    const setFocus = () => {ref.current &&  ref.current.focus()}

    return {setFocus, ref} 
}

Full Demo

JavaScript: changing the value of onclick with or without jQuery

If you don't want to actually navigate to a new page you can also have your anchor somewhere on the page like this.

<a id="the_anchor" href="">

And then to assign your string of JavaScript to the the onclick of the anchor, put this somewhere else (i.e. the header, later in the body, whatever):

<script>
    var js = "alert('I am your string of JavaScript');"; // js is your string of script
    document.getElementById('the_anchor').href = 'javascript:' + js;
</script>

If you have all of this info on the server before sending out the page, then you could also simply place the JavaScript directly in the href attribute of the anchor like so:

<a href="javascript:alert('I am your script.'); alert('So am I.');">Click me</a>

Get selected value from combo box in C# WPF

This largely depends on how the box is being filled. If it is done by attaching a DataTable (or other collection) to the ItemsSource, you may find attaching a SelectionChanged event handler to your box in the XAML and then using this in the code-behind useful:

private void ComboBoxName_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ComboBox cbx = (ComboBox)sender;
    string s = ((DataRowView)cbx.Items.GetItemAt(cbx.SelectedIndex)).Row.ItemArray[0].ToString();
}

I saw 2 other answers on here that had different parts of that - one had ComboBoxName.Items.GetItemAt(ComboBoxName.SelectedIndex).ToString();, which looks similar but doesn't cast the box to a DataRowView, something I found I needed to do, and another: ((DataRowView)comboBox1.SelectedItem).Row.ItemArray[0].ToString();, used .SelectedItem instead of .Items.GetItemAt(comboBox1.SelectedIndex). That might've worked, but what I settled on was actually the combination of the two I wrote above, and don't remember why I avoided .SelectedItem except that it must not have worked for me in this scenario.

If you are filling the box dynamically, or with ComboBoxItem items in the dropdown directly in the XAML, this is the code I use:

private void ComboBoxName_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ComboBox cbx = (ComboBox)sender;
    string val = String.Empty;
    if (cbx.SelectedValue == null)
        val = cbx.SelectionBoxItem.ToString();
    else
        val = cboParser(cbx.SelectedValue.ToString());
}

You'll see I have cboParser, there. This is because the output from SelectedValue looks like this: System.Windows.Controls.Control: Some Value. At least it did in my project. So you have to parse your Some Value out of that:

private static string cboParser(string controlString)
{
    if (controlString.Contains(':'))
    {
        controlString = controlString.Split(':')[1].TrimStart(' ');
    }
    return controlString;
}

But this is why there are so many answers on this page. It largely depends on how you are filling the box, as to how you can get the value back out of it. An answer might be right in one circumstance, and wrong in the other.

mysqli::mysqli(): (HY000/2002): Can't connect to local MySQL server through socket 'MySQL' (2)

When you use just "localhost" the MySQL client library tries to use a Unix domain socket for the connection instead of a TCP/IP connection. The error is telling you that the socket, called MySQL, cannot be used to make the connection, probably because it does not exist (error number 2).

From the MySQL Documentation:

On Unix, MySQL programs treat the host name localhost specially, in a way that is likely different from what you expect compared to other network-based programs. For connections to localhost, MySQL programs attempt to connect to the local server by using a Unix socket file. This occurs even if a --port or -P option is given to specify a port number. To ensure that the client makes a TCP/IP connection to the local server, use --host or -h to specify a host name value of 127.0.0.1, or the IP address or name of the local server. You can also specify the connection protocol explicitly, even for localhost, by using the --protocol=TCP option.

There are a few ways to solve this problem.

  1. You can just use TCP/IP instead of the Unix socket. You would do this by using 127.0.0.1 instead of localhost when you connect. The Unix socket might by faster and safer to use, though.
  2. You can change the socket in php.ini: open the MySQL configuration file my.cnf to find where MySQL creates the socket, and set PHP's mysqli.default_socket to that path. On my system it's /var/run/mysqld/mysqld.sock.
  3. Configure the socket directly in the PHP script when opening the connection. For example:

    $db = new MySQLi('localhost', 'kamil', '***', '', 0, 
                                  '/var/run/mysqld/mysqld.sock')
    

How to convert array values to lowercase in PHP?

use array_map():

$yourArray = array_map('strtolower', $yourArray);

In case you need to lowercase nested array (by Yahya Uddin):

$yourArray = array_map('nestedLowercase', $yourArray);

function nestedLowercase($value) {
    if (is_array($value)) {
        return array_map('nestedLowercase', $value);
    }
    return strtolower($value);
}

Passing enum or object through an intent (the best solution)

It may be possible to make your Enum implement Serializable then you can pass it via the Intent, as there is a method for passing it as a serializable. The advice to use int instead of enum is bogus. Enums are used to make your code easier to read and easier to maintain. It would a large step backwards into the dark ages to not be able to use Enums.

What is a PDB file?

PDB is an abbreviation for Program Data Base. As the name suggests, it is a repository (persistent storage such as databases) to maintain information required to run your program in debug mode. It contains many important relevant information required while you debug your code (in Visual Studio), for e.g. at what points you have inserted break points where you expect the debugger to break in Visual Studio.

This is the reason why many times Visual Studio fails to hit the break points if you remove the *.pdb files from your debug folders. Visual Studio debugger is also able to tell you the precise line number of code file at which an exception occurred in a stack trace with the help of *.pdb files. So effectively pdb files are really a boon to developers while debugging a program.

Generally it is not recommended to exclude the generation of *.pdb files. From production release stand-point what you should be doing is create the pdb files but don't ship them to customer site in product installer. Preserve all the generated PDB files on to a symbol server from where it can be used/referenced in future if required. Specially for cases when you debug issues like process crash. When you start analysing the crash dump files and if your original *.pdb files created during the build process are not preserved then Visual Studio will not be able to make out the exact line of code which is causing crash.

If you still want to disable generation of *.pdb files altogether for any release then go to properties of the project -> Build Tab -> Click on Advanced button -> Choose none from "Debug Info" drop-down box -> press OK as shown in the snapshot below.

None Debug Info setting for a C# Project

Note: This setting will have to be done separately for "Debug" and "Release" build configurations.

How can I convert this one line of ActionScript to C#?

There is collection of Func<...> classes - Func that is probably what you are looking for:

 void MyMethod(Func<int> param1 = null) 

This defines method that have parameter param1 with default value null (similar to AS), and a function that returns int. Unlike AS in C# you need to specify type of the function's arguments.

So if you AS usage was

MyMethod(function(intArg, stringArg) { return true; }) 

Than in C# it would require param1 to be of type Func<int, siring, bool> and usage like

MyMethod( (intArg, stringArg) => { return true;} ); 

How to handle windows file upload using Selenium WebDriver?

I made use of sendkeys in shell scripting using a vbsscript file. Below is the code in vbs file,

Set WshShell = WScript.CreateObject("WScript.Shell")
WshShell.SendKeys "C:\Demo.txt"
WshShell.SendKeys "{ENTER}"

Below is the selenium code line to run this vbs file,

driver.findElement(By.id("uploadname1")).click();
Thread.sleep(1000);
Runtime.getRuntime().exec( "wscript C:/script.vbs" );

Get file name from URL

How about this:

String filenameWithoutExtension = null;
String fullname = new File(
    new URI("http://www.xyz.com/some/deep/path/to/abc.png").getPath()).getName();

int lastIndexOfDot = fullname.lastIndexOf('.');
filenameWithoutExtension = fullname.substring(0, 
    lastIndexOfDot == -1 ? fullname.length() : lastIndexOfDot);

How do I use regex in a SQLite query?

for rails

            db = ActiveRecord::Base.connection.raw_connection
            db.create_function('regexp', 2) do |func, pattern, expression|
              func.result = expression.to_s.match(Regexp.new(pattern.to_s, Regexp::IGNORECASE)) ? 1 : 0
            end

What's the difference between [ and [[ in Bash?

  • [ is the same as the test builtin, and works like the test binary (man test)
    • works about the same as [ in all the other sh-based shells in many UNIX-like environments
    • only supports a single condition. Multiple tests with the bash && and || operators must be in separate brackets.
    • doesn't natively support a 'not' operator. To invert a condition, use a ! outside the first bracket to use the shell's facility for inverting command return values.
    • == and != are literal string comparisons
  • [[ is a bash
    • is bash-specific, though others shells may have implemented similar constructs. Don't expect it in an old-school UNIX sh.
    • == and != apply bash pattern matching rules, see "Pattern Matching" in man bash
    • has a =~ regex match operator
    • allows use of parentheses and the !, &&, and || logical operators within the brackets to combine subexpressions

Aside from that, they're pretty similar -- most individual tests work identically between them, things only get interesting when you need to combine different tests with logical AND/OR/NOT operations.

Why are only a few video games written in Java?

You can ask why web applications aren't written in C or C++, too. The power of Java lies in its network stack and object oriented design. Of course C and C++ have that, too. But on a lower abstraction. Thats nothing negative, but you don't want to reinvent the wheel every time, do you?

Java also has no direct hardware access, which means you are stuck with the API of any frameworks.

"Unmappable character for encoding UTF-8" error

"error: unmappable character for encoding UTF-8" means, java has found a character which is not representing in UTF-8. Hence open the file in an editor and set the character encoding to UTF-8. You should be able to find a character which is not represented in UTF-8.Take off this character and recompile.

Copy files on Windows Command Line with Progress

Some interesting timings regarding all these methods. If you have Gigabit connections, you should not use the /z flag or it will kill your connection speed. Robocopy or dism are the only tools that go full speed and show a progress bar. wdscase is for multicasting off a WDS server and might be faster if you are imaging 5+ computers. To get the 1:17 timing, I was maxing out the Gigabit connection at 920Mbps so you won't get that on two connections at once. Also take note that exporting the small wim index out of the larger wim file too longer than just copying the whole thing.

Model  Exe       OS       switches     index    size    time   link speed 
8760w  dism      Win8     /export-wim  index 1  6.27GB  2:21   link 1Gbps
8760w  dism      Win8     /export-wim  index 2  7.92GB  1:29   link 1Gbps
6305   wdsmcast  winpe32  /trans-file  res.RWM  7.92GB  6:54   link 1Gbps
6305   dism      Winpe32  /export-wim  index 1  6.27GB  2:20   link 1Gbps
6305   dism      Winpe32  /export-wim  index 2  7.92GB  1:34   link 1Gbps
6305   copy      Winpe32  /z           Whole    7.92GB  25:48  link 1Gbps
6305   copy      Winpe32  none         Wim      7.92GB  1:17   link 1Gbps
6305   xcopy     Winpe32  /z /j        Wim      7.92GB  23:54  link 1Gbps
6305   xcopy     Winpe32  /j           Wim      7.92GB  1:38   link 1Gbps
6305   VBS.copy  Winpe32               Wim      7.92    1:21   link 1Gbps
6305   robocopy  Winpe32               Wim      7.92    1:17   link 1Gbps

If you don't have robocopy.exe available, why not run it from the network share you are copying your files from? In my case, I prefer to do that so I don't have to rebuild my WinPE boot.wim file every time I want to make a change and then update dozens of flash drives.

Enter export password to generate a P12 certificate

I know this thread has been idle for a while, but I just wanted to add my two cents to supplement jariq's comment...

Per manual, you don't necessary want to use -password option.

Let's say mykey.key has a password and your want to protect iphone-dev.p12 with another password, this is what you'd use:

pkcs12 -export -inkey mykey.key -in developer_identity.pem -out iphone_dev.p12 -passin pass:password_for_mykey -passout pass:password_for_iphone_dev

Have fun scripting!!

Create html documentation for C# code

This page might interest you: http://msdn.microsoft.com/en-us/magazine/dd722812.aspx

You can generate the XML documentation file using either the command-line compiler or through the Visual Studio interface. If you are compiling with the command-line compiler, use options /doc or /doc+. That will generate an XML file by the same name and in the same path as the assembly. To specify a different file name, use /doc:file.

If you are using the Visual Studio interface, there's a setting that controls whether the XML documentation file is generated. To set it, double-click My Project in Solution Explorer to open the Project Designer. Navigate to the Compile tab. Find "Generate XML documentation file" at the bottom of the window, and make sure it is checked. By default this setting is on. It generates an XML file using the same name and path as the assembly.

Java 8 Iterable.forEach() vs foreach loop

The better practice is to use for-each. Besides violating the Keep It Simple, Stupid principle, the new-fangled forEach() has at least the following deficiencies:

  • Can't use non-final variables. So, code like the following can't be turned into a forEach lambda:
Object prev = null;
for(Object curr : list)
{
    if( prev != null )
        foo(prev, curr);
    prev = curr;
}
  • Can't handle checked exceptions. Lambdas aren't actually forbidden from throwing checked exceptions, but common functional interfaces like Consumer don't declare any. Therefore, any code that throws checked exceptions must wrap them in try-catch or Throwables.propagate(). But even if you do that, it's not always clear what happens to the thrown exception. It could get swallowed somewhere in the guts of forEach()

  • Limited flow-control. A return in a lambda equals a continue in a for-each, but there is no equivalent to a break. It's also difficult to do things like return values, short circuit, or set flags (which would have alleviated things a bit, if it wasn't a violation of the no non-final variables rule). "This is not just an optimization, but critical when you consider that some sequences (like reading the lines in a file) may have side-effects, or you may have an infinite sequence."

  • Might execute in parallel, which is a horrible, horrible thing for all but the 0.1% of your code that needs to be optimized. Any parallel code has to be thought through (even if it doesn't use locks, volatiles, and other particularly nasty aspects of traditional multi-threaded execution). Any bug will be tough to find.

  • Might hurt performance, because the JIT can't optimize forEach()+lambda to the same extent as plain loops, especially now that lambdas are new. By "optimization" I do not mean the overhead of calling lambdas (which is small), but to the sophisticated analysis and transformation that the modern JIT compiler performs on running code.

  • If you do need parallelism, it is probably much faster and not much more difficult to use an ExecutorService. Streams are both automagical (read: don't know much about your problem) and use a specialized (read: inefficient for the general case) parallelization strategy (fork-join recursive decomposition).

  • Makes debugging more confusing, because of the nested call hierarchy and, god forbid, parallel execution. The debugger may have issues displaying variables from the surrounding code, and things like step-through may not work as expected.

  • Streams in general are more difficult to code, read, and debug. Actually, this is true of complex "fluent" APIs in general. The combination of complex single statements, heavy use of generics, and lack of intermediate variables conspire to produce confusing error messages and frustrate debugging. Instead of "this method doesn't have an overload for type X" you get an error message closer to "somewhere you messed up the types, but we don't know where or how." Similarly, you can't step through and examine things in a debugger as easily as when the code is broken into multiple statements, and intermediate values are saved to variables. Finally, reading the code and understanding the types and behavior at each stage of execution may be non-trivial.

  • Sticks out like a sore thumb. The Java language already has the for-each statement. Why replace it with a function call? Why encourage hiding side-effects somewhere in expressions? Why encourage unwieldy one-liners? Mixing regular for-each and new forEach willy-nilly is bad style. Code should speak in idioms (patterns that are quick to comprehend due to their repetition), and the fewer idioms are used the clearer the code is and less time is spent deciding which idiom to use (a big time-drain for perfectionists like myself!).

As you can see, I'm not a big fan of the forEach() except in cases when it makes sense.

Particularly offensive to me is the fact that Stream does not implement Iterable (despite actually having method iterator) and cannot be used in a for-each, only with a forEach(). I recommend casting Streams into Iterables with (Iterable<T>)stream::iterator. A better alternative is to use StreamEx which fixes a number of Stream API problems, including implementing Iterable.

That said, forEach() is useful for the following:

  • Atomically iterating over a synchronized list. Prior to this, a list generated with Collections.synchronizedList() was atomic with respect to things like get or set, but was not thread-safe when iterating.

  • Parallel execution (using an appropriate parallel stream). This saves you a few lines of code vs using an ExecutorService, if your problem matches the performance assumptions built into Streams and Spliterators.

  • Specific containers which, like the synchronized list, benefit from being in control of iteration (although this is largely theoretical unless people can bring up more examples)

  • Calling a single function more cleanly by using forEach() and a method reference argument (ie, list.forEach (obj::someMethod)). However, keep in mind the points on checked exceptions, more difficult debugging, and reducing the number of idioms you use when writing code.

Articles I used for reference:

EDIT: Looks like some of the original proposals for lambdas (such as http://www.javac.info/closures-v06a.html Google Cache) solved some of the issues I mentioned (while adding their own complications, of course).

How do I skip an iteration of a `foreach` loop?

The easiest way to do that is like below:

//Skip First Iteration

foreach ( int number in numbers.Skip(1))

//Skip any other like 5th iteration

foreach ( int number in numbers.Skip(5))

C# Convert string from UTF-8 to ISO-8859-1 (Latin1) H

Encoding targetEncoding = Encoding.GetEncoding(1252);
// Encode a string into an array of bytes.
Byte[] encodedBytes = targetEncoding.GetBytes(utfString);
// Show the encoded byte values.
Console.WriteLine("Encoded bytes: " + BitConverter.ToString(encodedBytes));
// Decode the byte array back to a string.
String decodedString = Encoding.Default.GetString(encodedBytes);

Using other keys for the waitKey() function of opencv

This prints the key combination directly to the image:

z pressed an ctrl + z pressed

The first window shows 'z' pressed, the second shows 'ctrl' + 'z' pressed. When a key combination is used, a question mark appear.

Don't mess up with the question mark code, which is 63.

import numpy as np
import cv2

im = np.zeros((100, 300), np.uint8)
cv2.imshow('Keypressed', im)
while True:
  key = cv2.waitKey(0)
  im_c = im.copy()
  cv2.putText(
    im_c,
    f'{chr(key)} -> {key}',
    (10, 60), 
    cv2.FONT_HERSHEY_SIMPLEX, 
    1,
    (255,255,255),
    2)
  cv2.imshow('Keypressed', im_c)
  if key == 27: break # 'ESC'

CSS customized scroll bar in div

Or use somthing like this:

var MiniScroll=function(a,b){function e(){c.scrollUpdate()}function f(){var a=new Date,b=Math.abs(a-c.animation.frame),d=c.countScrollHeight();c.animation.frame=a,c.render(b),d.height!=c.controls.height&&(e(),c.controls.height=d.height),requestAnimationFrame(f)}function g(){c.scrollUpdate()}function h(a){var b=c.target.scrollTop,d=Math.abs(a.wheelDeltaY/(10-c.speed));c.target.scrollTop=a.wheelDeltaY>0?b-d:b+d,c.scrollUpdate()}function i(a){if(a.target.classList.contains("scroll"))return a.preventDefault(),!1;var b=c.countScrollHeight();c.target.scrollTop=a.offsetY*b.mul-parseInt(b.height)/2,c.scrollUpdate()}b=b||{};var c=this,d={speed:"speed"in b?b.speed:7};this.target=document.querySelector(a),this.animation={frame:new Date,stack:[]},this.identity="scroll"+parseInt(1e5*Math.random()),this.controls={place:null,scroll:null,height:0},this.speed=d.speed,this.target.style.overflow="hidden",this.draw(),requestAnimationFrame(f),this.target.onscroll=g,this.target.addEventListener("wheel",h),this.controls.place.onclick=i};MiniScroll.prototype.scrollUpdate=function(){this.controls.place.style.height=this.target.offsetHeight+"px";var a=this.countScrollHeight();this.controls.scroll.style.height=a.height,this.controls.scroll.style.top=a.top},MiniScroll.prototype.countScrollHeight=function(){for(var a=this.target.childNodes,b=parseInt(this.target.offsetHeight),c=0,d=0;d<a.length;d++)a[d].id!=this.identity&&(c+=parseInt(a[d].offsetHeight)||0);var e=this.target.offsetHeight*parseFloat(1/(parseFloat(c)/this.target.offsetHeight)),f=this.controls.place.offsetHeight*(this.target.scrollTop/c)+"px";return{mul:c/this.target.offsetHeight,height:e>b?b+"px":e+"px",top:f}},MiniScroll.prototype.draw=function(){var a=document.createElement("div"),b=document.createElement("div");a.className="scroll-place",b.className="scroll",a.appendChild(b),a.id=this.identity,this.controls.place=a,this.controls.scroll=b,this.target.insertBefore(a,this.target.querySelector("*")),this.scrollUpdate()},MiniScroll.prototype.render=function(a){for(var b=0;b<this.animation.stack.length;b++){var c=this.animation.stack[b],d=parseInt(c.target);c.element.style[c.prop]=d+c.points}};

And initialize:

<body onload="new MiniScroll(this);"></body>

And customize:

.scroll-place { // ... // }
.scroll { // ... // }

Nth word in a string variable

A file containing some statements :

cat test.txt

Result :

This is the 1st Statement
This is the 2nd Statement
This is the 3rd Statement
This is the 4th Statement
This is the 5th Statement

So, to print the 4th word of this statement type :

cat test.txt |awk '{print $4}'

Output :

1st
2nd
3rd
4th
5th

How to check if a character in a string is a digit or letter

You could use the existing methods from the Character class. Take a look at the docs:

http://download.java.net/jdk7/archive/b123/docs/api/java/lang/Character.html#isDigit(char)

So, you could do something like this...

String character = in.next();
char c = character.charAt(0);
...
if (Character.isDigit(c)) { 
    ... 
} else if (Character.isLetter(c)) {
    ...
}
...

If you ever want to know exactly how this is implemented, you could always look at the Java source code.

Microsoft.WebApplication.targets was not found, on the build server. What's your solution?

I tried a bunch of solutions, but in the end this answer worked for me: https://stackoverflow.com/a/19826448/431522

It basically entails calling MSBuild from the MSBuild directory, instead of the Visual Studio directory.

I also added the MSBuild directory to my path, to make the scripts easier to code.

Get list of a class' instance methods

According to Ruby Doc instance_methods

Returns an array containing the names of the public and protected instance methods in the receiver. For a module, these are the public and protected methods; for a class, they are the instance (not singleton) methods. If the optional parameter is false, the methods of any ancestors are not included. I am taking the official documentation example.

module A
  def method1()  
    puts "method1 say hi"
  end
end
class B
  include A #mixin
  def method2()  
     puts "method2 say hi"
  end
end
class C < B #inheritance
  def method3() 
     puts "method3 say hi"
  end
end

Let's see the output.

A.instance_methods(false)
  => [:method1]

A.instance_methods
  => [:method1]
B.instance_methods
 => [:method2, :method1, :nil?, :===, ...# ] # methods inherited from parent class, most important :method1 is also visible because we mix module A in class B

B.instance_methods(false)
  => [:method2]
C.instance_methods
  => [:method3, :method2, :method1, :nil?, :===, ...#] # same as above
C.instance_methods(false)
 => [:method3]

How to display an image stored as byte array in HTML/JavaScript?

Try putting this HTML snippet into your served document:

<img id="ItemPreview" src="">

Then, on JavaScript side, you can dynamically modify image's src attribute with so-called Data URL.

document.getElementById("ItemPreview").src = "data:image/png;base64," + yourByteArrayAsBase64;

Alternatively, using jQuery:

$('#ItemPreview').attr('src', `data:image/png;base64,${yourByteArrayAsBase64}`);

This assumes that your image is stored in PNG format, which is quite popular. If you use some other image format (e.g. JPEG), modify the MIME type ("image/..." part) in the URL accordingly.

Similar Questions:

How do I display image in Alert/confirm box in Javascript?

I created a function that might help. All it does is imitate the alert but put an image instead of text.

function alertImage(imgsrc) {
$('.d').css({
    'position': 'absolute',
    'top': '0',
    'left': '50%',
    '-webkit-transform': 'translate(-50%, 0)'
});
$('.d').animate({
    opacity: 0
}, 0)
$('.d').animate({
    opacity: 1,
    top: "10px"
}, 250)
$('.d').append('An embedded page on this page says')
$('.d').append('<br><img src="' + imgsrc + '">')
$('.b').css({
  'position':'absolute',
  '-webkit-transform': 'translate(-100%, -100%)',
  'top':'100%',
  'left':'100%',
  'display':'inline',
  'background-color':'#598cbd',
  'border-radius':'4px',
  'color':'white',
  'border':'none',
  'width':'66',
  'height':'33'
})
}
<script type="text/javascript" src="https://code.jquery.com/jquery-latest.min.js"></script>
<div class="d"><button onclick="$('.d').html('')" class="b">OK</button></div>
.d{
font-size: 17px;
  font-family: sans-serif;
}
.b{
  display: none;
}

AngularJs: How to check for changes in file input fields?

The clean way is to write your own directive to bind to "change" event. Just to let you know IE9 does not support FormData so you cannot really get the file object from the change event.

You can use ng-file-upload library which already supports IE with FileAPI polyfill and simplify the posting the file to the server. It uses a directive to achieve this.

<script src="angular.min.js"></script>
<script src="ng-file-upload.js"></script>

<div ng-controller="MyCtrl">
  <input type="file" ngf-select="onFileSelect($files)" multiple>
</div>

JS:

//inject angular file upload directive.
angular.module('myApp', ['ngFileUpload']);

var MyCtrl = [ '$scope', 'Upload', function($scope, Upload) {
  $scope.onFileSelect = function($files) {
    //$files: an array of files selected, each file has name, size, and type.
    for (var i = 0; i < $files.length; i++) {
      var $file = $files[i];
      Upload.upload({
        url: 'my/upload/url',
        data: {file: $file}
      }).then(function(data, status, headers, config) {
        // file is uploaded successfully
        console.log(data);
      }); 
    }
  }
}];

Matplotlib - How to plot a high resolution graph?

You can use savefig() to export to an image file:

plt.savefig('filename.png')

In addition, you can specify the dpi argument to some scalar value, for example:

plt.savefig('filename.png', dpi=300)

Execute another jar in a Java program

If you are java 1.6 then the following can also be done:

import javax.tools.JavaCompiler; 
import javax.tools.ToolProvider; 

public class CompilerExample {

    public static void main(String[] args) {
        String fileToCompile = "/Users/rupas/VolatileExample.java";

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        int compilationResult = compiler.run(null, null, null, fileToCompile);

        if (compilationResult == 0) {
            System.out.println("Compilation is successful");
        } else {
            System.out.println("Compilation Failed");
        }
    }
}

Change image size via parent div

Actually using 100% will not make the image bigger if the image is smaller than the div size you specified. You need to set one of the dimensions, height or width in order to have all images fill the space. In my experience it's better to have the height set so each row is the same size, then all items wrap to next line properly. This will produce an output similar to fotolia.com (stock image website)

with css:

parent {
   width: 42px; /* I took the width from your post and placed it in css */
   height: 42px;
}

/* This will style any <img> element in .parent div */
.parent img {
   height: 42px;
}

without:

<div style="height:42px;width:42px">
    <img style="height:42px" src="http://someimage.jpg">
</div>

e.printStackTrace equivalent in python

Adding to the other great answers, we can use the Python logging library's debug(), info(), warning(), error(), and critical() methods. Quoting from the docs for Python 3.7.4,

There are three keyword arguments in kwargs which are inspected: exc_info which, if it does not evaluate as false, causes exception information to be added to the logging message.

What this means is, you can use the Python logging library to output a debug(), or other type of message, and the logging library will include the stack trace in its output. With this in mind, we can do the following:

import logging

logger = logging.getLogger()
logger.setLevel(logging.DEBUG)

def f():
    a = { 'foo': None }
    # the following line will raise KeyError
    b = a['bar']

def g():
    f()

try:
    g()
except Exception as e:
    logger.error(str(e), exc_info=True)

And it will output:

'bar'
Traceback (most recent call last):
  File "<ipython-input-2-8ae09e08766b>", line 18, in <module>
    g()
  File "<ipython-input-2-8ae09e08766b>", line 14, in g
    f()
  File "<ipython-input-2-8ae09e08766b>", line 10, in f
    b = a['bar']
KeyError: 'bar'

Programmatically register a broadcast receiver

Create a broadcast receiver

[BroadcastReceiver(Enabled = true, Exported = false)]

public class BCReceiver : BroadcastReceiver
{

    BCReceiver receiver;

    public override void OnReceive(Context context, Intent intent)
    {
        //Do something here
    }
}

From your activity add this code:

LocalBroadcastManager.getInstance(ApplicationContext)
    .registerReceiver(receiver, filter);

Get characters after last / in url

Here's a beautiful dynamic function I wrote to remove last part of url or path.

/**
 * remove the last directories
 *
 * @param $path the path
 * @param $level number of directories to remove
 *
 * @return string
 */
private function removeLastDir($path, $level)
{
    if(is_int($level) && $level > 0){
        $path = preg_replace('#\/[^/]*$#', '', $path);
        return $this->removeLastDir($path, (int) $level - 1);
    }
    return $path;
}

SQL select only rows with max value on a column

Since this is most popular question with regard to this problem, I'll re-post another answer to it here as well:

It looks like there is simpler way to do this (but only in MySQL):

select *
from (select * from mytable order by id, rev desc ) x
group by id

Please credit answer of user Bohemian in this question for providing such a concise and elegant answer to this problem.

Edit: though this solution works for many people it may not be stable in the long run, since MySQL doesn't guarantee that GROUP BY statement will return meaningful values for columns not in GROUP BY list. So use this solution at your own risk!

Jenkins pipeline if else not working

your first try is using declarative pipelines, and the second working one is using scripted pipelines. you need to enclose steps in a steps declaration, and you can't use if as a top-level step in declarative, so you need to wrap it in a script step. here's a working declarative version:

pipeline {
    agent any

    stages {
        stage('test') {
            steps {
                sh 'echo hello'
            }
        }
        stage('test1') {
            steps {
                sh 'echo $TEST'
            }
        }
        stage('test3') {
            steps {
                script {
                    if (env.BRANCH_NAME == 'master') {
                        echo 'I only execute on the master branch'
                    } else {
                        echo 'I execute elsewhere'
                    }
                }
            }
        }
    }
}

you can simplify this and potentially avoid the if statement (as long as you don't need the else) by using "when". See "when directive" at https://jenkins.io/doc/book/pipeline/syntax/. you can also validate jenkinsfiles using the jenkins rest api. it's super sweet. have fun with declarative pipelines in jenkins!

Android - how do I investigate an ANR?

Whenever you're analyzing timing issues, debugging often does not help, as freezing the app at a breakpoint will make the problem go away.

Your best bet is to insert lots of logging calls (Log.XXX()) into the app's different threads and callbacks and see where the delay is at. If you need a stacktrace, create a new Exception (just instantiate one) and log it.

Python MySQLdb TypeError: not all arguments converted during string formatting

According PEP8,I prefer to execute SQL in this way:

cur = con.cursor()
# There is no need to add single-quota to the surrounding of `%s`,
# because the MySQLdb precompile the sql according to the scheme type
# of each argument in the arguments list.
sql = "SELECT * FROM records WHERE email LIKE %s;"
args = [search, ]
cur.execute(sql, args)

In this way, you will recognize that the second argument args of execute method must be a list of arguments.

May this helps you.

how to get param in method post spring mvc?

When I want to get all the POST params I am using the code below,

@RequestMapping(value = "/", method = RequestMethod.POST)
public ViewForResponseClass update(@RequestBody AClass anObject) {
    // Source..
}

I am using the @RequestBody annotation for post/put/delete http requests instead of the @RequestParam which reads the GET parameters.

no module named zlib

By default when you configuring Python source, zlib module is disabled, so you can enable it using option --with-zlib when you configure it. So it becomes

./configure --with-zlib

Windows batch: echo without new line

As an addendum to @xmechanix's answer, I noticed through writing the contents to a file:

echo | set /p dummyName=Hello World > somefile.txt

That this will add an extra space at the end of the printed string, which can be inconvenient, specially since we're trying to avoid adding a new line (another whitespace character) to the end of the string.

Fortunately, quoting the string to be printed, i.e. using:

echo | set /p dummyName="Hello World" > somefile.txt

Will print the string without any newline or space character at the end.

How to convert a byte array to its numeric value (Java)?

One could use the Buffers that are provided as part of the java.nio package to perform the conversion.

Here, the source byte[] array has a of length 8, which is the size that corresponds with a long value.

First, the byte[] array is wrapped in a ByteBuffer, and then the ByteBuffer.getLong method is called to obtain the long value:

ByteBuffer bb = ByteBuffer.wrap(new byte[] {0, 0, 0, 0, 0, 0, 0, 4});
long l = bb.getLong();

System.out.println(l);

Result

4

I'd like to thank dfa for pointing out the ByteBuffer.getLong method in the comments.


Although it may not be applicable in this situation, the beauty of the Buffers come with looking at an array with multiple values.

For example, if we had a 8 byte array, and we wanted to view it as two int values, we could wrap the byte[] array in an ByteBuffer, which is viewed as a IntBuffer and obtain the values by IntBuffer.get:

ByteBuffer bb = ByteBuffer.wrap(new byte[] {0, 0, 0, 1, 0, 0, 0, 4});
IntBuffer ib = bb.asIntBuffer();
int i0 = ib.get(0);
int i1 = ib.get(1);

System.out.println(i0);
System.out.println(i1);

Result:

1
4

Speed up rsync with Simultaneous/Concurrent File Transfers?

Updated answer (Jan 2020)

xargs is now the recommended tool to achieve parallel execution. It's pre-installed almost everywhere. For running multiple rsync tasks the command would be:

ls /srv/mail | xargs -n1 -P4 -I% rsync -Pa % myserver.com:/srv/mail/

This will list all folders in /srv/mail, pipe them to xargs, which will read them one-by-one and and run 4 rsync processes at a time. The % char replaces the input argument for each command call.

Original answer using parallel:

ls /srv/mail | parallel -v -j8 rsync -raz --progress {} myserver.com:/srv/mail/{}

How do I kill a process using Vb.NET or C#?

In my tray app, I needed to clean Excel and Word Interops. So This simple method kills processes generically.

This uses a general exception handler, but could be easily split for multiple exceptions like stated in other answers. I may do this if my logging produces alot of false positives (ie can't kill already killed). But so far so guid (work joke).

/// <summary>
/// Kills Processes By Name
/// </summary>
/// <param name="names">List of Process Names</param>
private void killProcesses(List<string> names)
{
    var processes = new List<Process>();
    foreach (var name in names)
        processes.AddRange(Process.GetProcessesByName(name).ToList());
    foreach (Process p in processes)
    {
        try
        {
            p.Kill();
            p.WaitForExit();
        }
        catch (Exception ex)
        {
            // Logging
            RunProcess.insertFeedback("Clean Processes Failed", ex);
        }
    }
}

This is how i called it then:

killProcesses((new List<string>() { "winword", "excel" }));

How to get content body from a httpclient call?

If you are not wanting to use async you can add .Result to force the code to execute synchronously:

private string GetResponseString(string text)
{
    var httpClient = new HttpClient();

    var parameters = new Dictionary<string, string>();
    parameters["text"] = text;

    var response = httpClient.PostAsync(BaseUri, new FormUrlEncodedContent(parameters)).Result;
    var contents = response.Content.ReadAsStringAsync().Result;

    return contents;
 }  

Fatal error: Call to undefined function mcrypt_encrypt()

If you using ubuntu 14.04 here is the fix to this problem:

First check php5-mcryp is already installed apt-get install php5-mcrypt

If installed, just run this two command or install and run this two command

$ sudo php5enmod mcrypt
$ sudo service apache2 restart

I hope it will work.

Swap x and y axis without manually swapping values

Using Excel 2010 x64. XY plot: I could not see no tabs (it is late and I am probably tired blind, 250 limit?). Here is what worked for me:

Swap the data columns, to end with X_data in column A and Y_data in column B.

My original data had Y_data in column A and X_data in column B, and the graph was rotated 90deg clockwise. I was suffering. Then it hit me: an Excel XY plot literally wants {x,y} pairs, i.e. X_data in first column and Y_data in second column. But it does not tell you this right away. For me an XY plot means Y=f(X) plotted.

UIView with rounded corners and drop shadow?

Swift 3 & IBInspectable solution:
Inspired by Ade's solution

First, create an UIView extension:

//
//  UIView-Extension.swift
//  

import Foundation
import UIKit

@IBDesignable
extension UIView {
     // Shadow
     @IBInspectable var shadow: Bool {
          get {
               return layer.shadowOpacity > 0.0
          }
          set {
               if newValue == true {
                    self.addShadow()
               }
          }
     }

     fileprivate func addShadow(shadowColor: CGColor = UIColor.black.cgColor, shadowOffset: CGSize = CGSize(width: 3.0, height: 3.0), shadowOpacity: Float = 0.35, shadowRadius: CGFloat = 5.0) {
          let layer = self.layer
          layer.masksToBounds = false

          layer.shadowColor = shadowColor
          layer.shadowOffset = shadowOffset
          layer.shadowRadius = shadowRadius
          layer.shadowOpacity = shadowOpacity
          layer.shadowPath = UIBezierPath(roundedRect: layer.bounds, cornerRadius: layer.cornerRadius).cgPath

          let backgroundColor = self.backgroundColor?.cgColor
          self.backgroundColor = nil
          layer.backgroundColor =  backgroundColor
     }


     // Corner radius
     @IBInspectable var circle: Bool {
          get {
               return layer.cornerRadius == self.bounds.width*0.5
          }
          set {
               if newValue == true {
                    self.cornerRadius = self.bounds.width*0.5
               }
          }
     }

     @IBInspectable var cornerRadius: CGFloat {
          get {
               return self.layer.cornerRadius
          }

          set {
               self.layer.cornerRadius = newValue
          }
     }


     // Borders
     // Border width
     @IBInspectable
     public var borderWidth: CGFloat {
          set {
               layer.borderWidth = newValue
          }

          get {
               return layer.borderWidth
          }
     }

     // Border color
     @IBInspectable
     public var borderColor: UIColor? {
          set {
               layer.borderColor = newValue?.cgColor
          }

          get {
               if let borderColor = layer.borderColor {
                    return UIColor(cgColor: borderColor)
               }
               return nil
          }
     }
}

Then, simply select your UIView in interface builder setting shadow ON and corner radius, like below:

Selecting your UIView

Setting shadow ON & corner radius

The result!

Result

process.waitFor() never returns

I would like to add something to the previous answers but since I don't have the rep to comment, I will just add an answer. This is directed towards android users which are programming in Java.

Per the post from RollingBoy, this code almost worked for me:

Process process = Runtime.getRuntime().exec("tasklist");
BufferedReader reader =
new BufferedReader(new InputStreamReader(process.getInputStream()));
while ((reader.readLine()) != null) {}
process.waitFor();

In my case, the waitFor() was not releasing because I was executing a statement with no return ("ip adddr flush eth0"). An easy way to fix this is to simply ensure you always return something in your statement. For me, that meant executing the following: "ip adddr flush eth0 && echo done". You can read the buffer all day, but if there is nothing ever returned, your thread will never release its wait.

Hope that helps someone!

What is the format specifier for unsigned short int?

From the Linux manual page:

h      A  following  integer conversion corresponds to a short int or unsigned short int argument, or a fol-
       lowing n conversion corresponds to a pointer to a short int argument.

So to print an unsigned short integer, the format string should be "%hu".

How to split a string between letters and digits (or between digits and letters)?

You could try to split on (?<=\D)(?=\d)|(?<=\d)(?=\D), like:

str.split("(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)");

It matches positions between a number and not-a-number (in any order).

  • (?<=\D)(?=\d) - matches a position between a non-digit (\D) and a digit (\d)
  • (?<=\d)(?=\D) - matches a position between a digit and a non-digit.

Accessing nested JavaScript objects and arrays by string path

Note that the following will not work for all valid unicode property names (but neither will any of the other answers as far as I can tell).

_x000D_
_x000D_
const PATTERN = /[\^|\[|\.]([$|\w]+)/gu

function propValue(o, s) {
    const names = []
    for(let [, name] of [...s.matchAll(PATTERN)]) 
        names.push(name)
    return names.reduce((p, propName) => {
        if(!p.hasOwnProperty(propName)) 
            throw 'invalid property name'
        return p[propName]
    }, o)
}

let path = 'myObject.1._property2[0][0].$property3'
let o = {
    1: {
        _property2: [
            [{
                $property3: 'Hello World'
            }]
        ]
    }
}
console.log(propValue(o, path)) // 'Hello World'
_x000D_
_x000D_
_x000D_

Resize image proportionally with MaxHeight and MaxWidth constraints

Like this?

public static void Test()
{
    using (var image = Image.FromFile(@"c:\logo.png"))
    using (var newImage = ScaleImage(image, 300, 400))
    {
        newImage.Save(@"c:\test.png", ImageFormat.Png);
    }
}

public static Image ScaleImage(Image image, int maxWidth, int maxHeight)
{
    var ratioX = (double)maxWidth / image.Width;
    var ratioY = (double)maxHeight / image.Height;
    var ratio = Math.Min(ratioX, ratioY);

    var newWidth = (int)(image.Width * ratio);
    var newHeight = (int)(image.Height * ratio);

    var newImage = new Bitmap(newWidth, newHeight);

    using (var graphics = Graphics.FromImage(newImage))
        graphics.DrawImage(image, 0, 0, newWidth, newHeight);

    return newImage;
}

ORA-01031: insufficient privileges when selecting view

you may also create view with schema name for example create or replace view schema_name.view_name as select..

Losing Session State

I was having a situation in ASP.NET 4.0 where my session would be reset on every page request (and my SESSION_START code would run on each page request). This didn't happen to every user for every session, but it usually happened, and when it did, it would happen on each page request.

My web.config sessionState tag had the same setting as the one mentioned above.

cookieless="false"

When I changed it to the following...

cookieless="UseCookies"

... the problem seemed to go away. Apparently true|false were old choices from ASP.NET 1. Starting in ASP.Net 2.0, the enumerated choices started being available. I guess these options were deprecated. The "false" value has never presented a problem in the past - I've only noticed in on ASP.NET 4.0. I don't know if something has changed in 4.0 that no longer supports it correctly.

Also, I just found this out not long ago. Since the problem was intermittent before, I suppose I could still encounter it, but so far it's working with this new setting.

Change <br> height using CSS

The line height of the <br> can be different from the line height of the rest of the text inside a <p>. You can control the line height of your <br> tags independently of the rest of the text by enclosing two of them in a <span> that is styled. Use the line-height css property, as others have suggested.

<p class="normalLineHeight">
  Lots of text here which will display on several lines with normal line height if you put it in a narrow container...
  <span class="customLineHeight"><br><br></span>
  After a custom break, this text will again display on several lines with normal line height...
</p>

How to add a response header on nginx when using proxy_pass?

As oliver writes:

add_header works as well with proxy_pass as without.

However, as Shane writes, as of Nginx 1.7.5, you must pass always in order to get add_header to work for error responses, like so:

add_header  X-Upstream  $upstream_addr always;

How to convert XML to java.util.Map and vice versa

XStream!

Updated: I added unmarshal part as requested in comments..

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;

import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;

public class Test {

    public static void main(String[] args) {

        Map<String,String> map = new HashMap<String,String>();
        map.put("name","chris");
        map.put("island","faranga");

        XStream magicApi = new XStream();
        magicApi.registerConverter(new MapEntryConverter());
        magicApi.alias("root", Map.class);

        String xml = magicApi.toXML(map);
        System.out.println("Result of tweaked XStream toXml()");
        System.out.println(xml);

        Map<String, String> extractedMap = (Map<String, String>) magicApi.fromXML(xml);
        assert extractedMap.get("name").equals("chris");
        assert extractedMap.get("island").equals("faranga");

    }

    public static class MapEntryConverter implements Converter {

        public boolean canConvert(Class clazz) {
            return AbstractMap.class.isAssignableFrom(clazz);
        }

        public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {

            AbstractMap map = (AbstractMap) value;
            for (Object obj : map.entrySet()) {
                Map.Entry entry = (Map.Entry) obj;
                writer.startNode(entry.getKey().toString());
                Object val = entry.getValue();
                if ( null != val ) {
                    writer.setValue(val.toString());
                }
                writer.endNode();
            }

        }

        public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {

            Map<String, String> map = new HashMap<String, String>();

            while(reader.hasMoreChildren()) {
                reader.moveDown();

                String key = reader.getNodeName(); // nodeName aka element's name
                String value = reader.getValue();
                map.put(key, value);

                reader.moveUp();
            }

            return map;
        }

    }

}

How do I get first name and last name as whole name in a MYSQL query?

When you have three columns : first_name, last_name, mid_name:

SELECT CASE 
    WHEN mid_name IS NULL OR TRIM(mid_name) ='' THEN
        CONCAT_WS( " ", first_name, last_name ) 
    ELSE 
        CONCAT_WS( " ", first_name, mid_name, last_name ) 
    END 
FROM USER;

Install shows error in console: INSTALL FAILED CONFLICTING PROVIDER

Basically this happened with me, when i tried to change the package name of the app.

So, in emulator, same app was installed before. When i tried to install app after changing package name, it said, authority already used by older application in device.

Simply after uninstalling the application, it solved my problem.

Also, Authority name should always be : your.package.name.UNIQUENAME;

example :

  <provider
        android:name="com.aviary.android.feather.cds.AviaryCdsProvider"
        android:authorities="your.package.name.AviaryCdsProvider"
       />

Creating files in C++

#include <iostream>
#include <fstream>

int main() {
  std::ofstream o("Hello.txt");

  o << "Hello, World\n" << std::endl;

  return 0;
}

What's the fastest way in Python to calculate cosine similarity given sparse matrix data?

Building off of Vaali's solution:

def sparse_cosine_similarity(sparse_matrix):
    out = (sparse_matrix.copy() if type(sparse_matrix) is csr_matrix else
           sparse_matrix.tocsr())
    squared = out.multiply(out)
    sqrt_sum_squared_rows = np.array(np.sqrt(squared.sum(axis=1)))[:, 0]
    row_indices, col_indices = out.nonzero()
    out.data /= sqrt_sum_squared_rows[row_indices]
    return out.dot(out.T)

This takes a sparse matrix (preferably a csr_matrix) and returns a csr_matrix. It should do the more intensive parts using sparse calculations with pretty minimal memory overhead. I haven't tested it extensively though, so caveat emptor (Update: I feel confident in this solution now that I've tested and benchmarked it)

Also, here is the sparse version of Waylon's solution in case it helps anyone, not sure which solution is actually better.

def sparse_cosine_similarity_b(sparse_matrix):
    input_csr_matrix = sparse_matrix.tocsr()
    similarity = input_csr_matrix * input_csr_matrix.T
    square_mag = similarity.diagonal()
    inv_square_mag = 1 / square_mag
    inv_square_mag[np.isinf(inv_square_mag)] = 0
    inv_mag = np.sqrt(inv_square_mag)
    return similarity.multiply(inv_mag).T.multiply(inv_mag)

Both solutions seem to have parity with sklearn.metrics.pairwise.cosine_similarity

:-D

Update:

Now I have tested both solutions against my existing Cython implementation: https://github.com/davidmashburn/sparse_dot/blob/master/test/benchmarks_v3_output_table.txt and it looks like the first algorithm performs the best of the three most of the time.

Eclipse Indigo - Cannot install Android ADT Plugin

Go to Help->Install Software. Add the following link http://dl-ssl.google.com/android/eclipse/ .

Then press next and accept the license, it installs some of the software required then you will be gud to go.

After the eclipse restarts it prompts you to download the android sdk required or give the path of android sdk if already it is downloaded.

This works all the time what ever may be the version.

Javascript communication between browser tabs/windows

There is also an experimental technology called Broadcast Channel API that is designed specifically for communication between different browser contexts with same origin. You can post messages to and recieve messages from another browser context without having a reference to it:

var channel = new BroadcastChannel("foo");
channel.onmessage = function( e ) {
  // Process messages from other contexts.
};
// Send message to other listening contexts.
channel.postMessage({ value: 42, type: "bar"});

Obviously this is experiental technology and is not supported accross all browsers yet.

How can I add new item to the String array?

Simple answer: You can't. An array is fixed size in Java. You'll want to use a List<String>.

Alternatively, you could create an array of fixed size and put things in it:

String[] array = new String[2];
array[0] = "Hello";
array[1] = "World!";

What is the purpose of the single underscore "_" variable in Python?

It's just a variable name, and it's conventional in python to use _ for throwaway variables. It just indicates that the loop variable isn't actually used.

What is the most efficient/elegant way to parse a flat table into a tree?

To Extend Bill's SQL solution you can basically do the same using a flat array. Further more if your strings all have the same lenght and your maximum number of children are known (say in a binary tree) you can do it using a single string (character array). If you have arbitrary number of children this complicates things a bit... I would have to check my old notes to see what can be done.

Then, sacrificing a bit of memory, especially if your tree is sparse and/or unballanced, you can, with a bit of index math, access all the strings randomly by storing your tree, width first in the array like so (for a binary tree):

String[] nodeArray = [L0root, L1child1, L1child2, L2Child1, L2Child2, L2Child3, L2Child4] ...

yo know your string length, you know it

I'm at work now so cannot spend much time on it but with interest I can fetch a bit of code to do this.

We use to do it to search in binary trees made of DNA codons, a process built the tree, then we flattened it to search text patterns and when found, though index math (revers from above) we get the node back... very fast and efficient, tough our tree rarely had empty nodes, but we could searh gigabytes of data in a jiffy.

javax.validation.ValidationException: HV000183: Unable to load 'javax.el.ExpressionFactory'

It is working after adding to pom.xml following dependencies:

<dependency>
   <groupId>javax.el</groupId>
   <artifactId>javax.el-api</artifactId>
   <version>2.2.4</version>
</dependency>
<dependency>
   <groupId>org.glassfish.web</groupId>
   <artifactId>javax.el</artifactId>
   <version>2.2.4</version>
</dependency>

Getting started with Hibernate Validator:

Hibernate Validator also requires an implementation of the Unified Expression Language (JSR 341) for evaluating dynamic expressions in constraint violation messages. When your application runs in a Java EE container such as WildFly, an EL implementation is already provided by the container. In a Java SE environment, however, you have to add an implementation as dependency to your POM file. For instance you can add the following two dependencies to use the JSR 341 reference implementation:

<dependency>
   <groupId>javax.el</groupId>
   <artifactId>javax.el-api</artifactId>
   <version>2.2.4</version>
</dependency>
<dependency>
   <groupId>org.glassfish.web</groupId>
   <artifactId>javax.el</artifactId>
   <version>2.2.4</version>
</dependency>

Batch file to copy files from one folder to another folder

Just to be clear, when you use xcopy /s c:\source d:\target, put "" around the c:\source and d:\target,otherwise you get error.

ie if there are spaces in the path ie if you have:

"C:\Some Folder\*.txt"

but not required if you have:

C:\SomeFolder\*.txt

How to generate a random integer number from within a range

In order to avoid the modulo bias (suggested in other answers) you can always use:

arc4random_uniform(MAX-MIN)+MIN

Where "MAX" is the upper bound and "MIN" is lower bound. For example, for numbers between 10 and 20:

arc4random_uniform(20-10)+10

arc4random_uniform(10)+10

Simple solution and better than using "rand() % N".

Convert pyQt UI to python

Quickest way to convert .ui to .py is from terminal:

pyuic4 -x input.ui -o output.py

Make sure you have pyqt4-dev-tools installed.

How can I display just a portion of an image in HTML/CSS?

As mentioned in the question, there is the clip css property, although it does require that the element being clipped is position: absolute; (which is a shame):

_x000D_
_x000D_
.container {_x000D_
  position: relative;_x000D_
}_x000D_
#clip {_x000D_
  position: absolute;_x000D_
  clip: rect(0, 100px, 200px, 0);_x000D_
  /* clip: shape(top, right, bottom, left); NB 'rect' is the only available option */_x000D_
}
_x000D_
<div class="container">_x000D_
  <img src="http://lorempixel.com/200/200/nightlife/3" />_x000D_
</div>_x000D_
<div class="container">_x000D_
  <img id="clip" src="http://lorempixel.com/200/200/nightlife/3" />_x000D_
</div>
_x000D_
_x000D_
_x000D_

JS Fiddle demo, for experimentation.

To supplement the original answer – somewhat belatedly – I'm editing to show the use of clip-path, which has replaced the now-deprecated clip property.

The clip-path property allows a range of options (more-so than the original clip), of:

  • inset — rectangular/cuboid shapes, defined with four values as 'distance-from' (top right bottom left).
  • circlecircle(diameter at x-coordinate y-coordinate).
  • ellipseellipse(x-axis-length y-axis-length at x-coordinate y-coordinate).
  • polygon — defined by a series of x/y coordinates in relation to the element's origin of the top-left corner. As the path is closed automatically the realistic minimum number of points for a polygon should be three, any fewer (two) is a line or (one) is a point: polygon(x-coordinate1 y-coordinate1, x-coordinate2 y-coordinate2, x-coordinate3 y-coordinate3, [etc...]).
  • url — this can be either a local URL (using a CSS id-selector) or the URL of an external file (using a file-path) to identify an SVG, though I've not experimented with either (as yet), so I can offer no insight as to their benefit or caveat.

_x000D_
_x000D_
div.container {_x000D_
  display: inline-block;_x000D_
}_x000D_
#rectangular {_x000D_
  -webkit-clip-path: inset(30px 10px 30px 10px);_x000D_
  clip-path: inset(30px 10px 30px 10px);_x000D_
}_x000D_
#circle {_x000D_
  -webkit-clip-path: circle(75px at 50% 50%);_x000D_
  clip-path: circle(75px at 50% 50%)_x000D_
}_x000D_
#ellipse {_x000D_
  -webkit-clip-path: ellipse(75px 50px at 50% 50%);_x000D_
  clip-path: ellipse(75px 50px at 50% 50%);_x000D_
}_x000D_
#polygon {_x000D_
  -webkit-clip-path: polygon(50% 0, 100% 38%, 81% 100%, 19% 100%, 0 38%);_x000D_
  clip-path: polygon(50% 0, 100% 38%, 81% 100%, 19% 100%, 0 38%);_x000D_
}
_x000D_
<div class="container">_x000D_
  <img id="control" src="http://lorempixel.com/150/150/people/1" />_x000D_
</div>_x000D_
<div class="container">_x000D_
  <img id="rectangular" src="http://lorempixel.com/150/150/people/1" />_x000D_
</div>_x000D_
<div class="container">_x000D_
  <img id="circle" src="http://lorempixel.com/150/150/people/1" />_x000D_
</div>_x000D_
<div class="container">_x000D_
  <img id="ellipse" src="http://lorempixel.com/150/150/people/1" />_x000D_
</div>_x000D_
<div class="container">_x000D_
  <img id="polygon" src="http://lorempixel.com/150/150/people/1" />_x000D_
</div>
_x000D_
_x000D_
_x000D_

JS Fiddle demo, for experimentation.

References:

Unable to install pyodbc on Linux

Execute the following commands (tested on centos 6.5):

yum install install unixodbc-dev
yum install gcc-c++
yum install python-devel
pip install --allow-external pyodbc --allow-unverified pyodbc pyodbc

Check if element is in the list (contains)

Declare additional helper function like this:

template <class T, class I >
bool vectorContains(const vector<T>& v, I& t)
{
    bool found = (std::find(v.begin(), v.end(), t) != v.end());
    return found;
}

And use it like this:

void Project::AddPlatform(const char* platform)
{
    if (!vectorContains(platforms, platform))
        platforms.push_back(platform);
}

Snapshot of example can be found here:

https://github.com/tapika/cppscriptcore/blob/b7f3d62747494a52a440482e841ffb016a3fc56e/SolutionProjectModel/Project.cpp#L13

findViewByID returns null

In my case, findViewById returned null when I moved the call from a parent object into an adapter object instantiated by the parent. After trying tricks listed here without success, I moved the findViewById back into the parent object and passed the result as a parameter during instantiation of the adapter object. For example, I did this in parent object:

 Spinner hdSpinner = (Spinner)view.findViewById(R.id.accountsSpinner);

Then I passed the hdSpinner as a parameter during creation of the adapter object:

  mTransactionAdapter = new TransactionAdapter(getActivity(),
        R.layout.transactions_list_item, null, from, to, 0, hdSpinner);

Android: how to get the current day of the week (Monday, etc...) in the user's language?

Use SimpleDateFormat to format dates and times into a human-readable string, with respect to the users locale.

Small example to get the current day of the week (e.g. "Monday"):

SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
Date d = new Date();
String dayOfTheWeek = sdf.format(d);

How do I draw a set of vertical lines in gnuplot?

Here is a snippet from my perl script to do this:

print OUTPUT "set arrow from $x1,$y1 to $x1,$y2 nohead lc rgb \'red\'\n";

As you might guess from above, it's actually drawn as a "headless" arrow.

How to downgrade or install an older version of Cocoapods

Actually, you don't need to downgrade – if you need to use older version in some projects, just specify the version that you need to use after pod command.

pod _0.37.2_ setup

HintPath vs ReferencePath in Visual Studio

According to this MSDN blog: https://blogs.msdn.microsoft.com/manishagarwal/2005/09/28/resolving-file-references-in-team-build-part-2/

There is a search order for assemblies when building. The search order is as follows:

  • Files from the current project – indicated by ${CandidateAssemblyFiles}.
  • $(ReferencePath) property that comes from .user/targets file.
  • %(HintPath) metadata indicated by reference item.
  • Target framework directory.
  • Directories found in registry that uses AssemblyFoldersEx Registration.
  • Registered assembly folders, indicated by ${AssemblyFolders}.
  • $(OutputPath) or $(OutDir)
  • GAC

So, if the desired assembly is found by HintPath, but an alternate assembly can be found using ReferencePath, it will prefer the ReferencePath'd assembly to the HintPath'd one.

Typescript empty object for a typed variable

Note that using const user = {} as UserType just provides intellisense but at runtime user is empty object {} and has no property inside. that means user.Email will give undefined instead of ""

type UserType = {
    Username: string;
    Email: string;
}

So, use class with constructor for actually creating objects with default properties.

type UserType = {
  Username: string;
  Email: string;
};

class User implements UserType {
  constructor() {
    this.Username = "";
    this.Email = "";
  }

  Username: string;
  Email: string;
}

const myUser = new User();
console.log(myUser); // output: {Username: "", Email: ""}
console.log("val: "+myUser.Email); // output: ""

You can also use interface instead of type

interface UserType {
  Username: string;
  Email: string;
};

...and rest of code remains same.


Actually, you can even skip the constructor part and use it like this:

class User implements UserType {
      Username = ""; // will be added to new obj
      Email: string; // will not be added
}

const myUser = new User();
console.log(myUser); // output: {Username: ""}

What is the proper way to test if a parameter is empty in a batch file?

Use "IF DEFINED variable command" to test variable in batch file.

But if you want to test batch parameters, try below codes to avoid tricky input (such as "1 2" or ab^>cd)

set tmp="%1"
if "%tmp:"=.%"==".." (
    echo empty
) else (
    echo not empty
)

How to divide two columns?

Presumably, those columns are integer columns - which will be the reason as the result of the calculation will be of the same type.

e.g. if you do this:

SELECT 1 / 2

you will get 0, which is obviously not the real answer. So, convert the values to e.g. decimal and do the calculation based on that datatype instead.

e.g.

SELECT CAST(1 AS DECIMAL) / 2

gives 0.500000

display:inline vs display:block

block elements expand to fill their parent.

inline elements contract to be just big enough to hold their children.

What happened to Lodash _.pluck?

Ah-ha! The Lodash Changelog says it all...

"Removed _.pluck in favor of _.map with iteratee shorthand"

var objects = [{ 'a': 1 }, { 'a': 2 }];

// in 3.10.1
_.pluck(objects, 'a'); // ? [1, 2]
_.map(objects, 'a'); // ? [1, 2]

// in 4.0.0
_.map(objects, 'a'); // ? [1, 2]

Appending output of a Batch file To log file

Use log4j in your java program instead. Then you can output to multiple media, create rolling logs, etc. and include timestamps, class names and line numbers.

How do I use the ternary operator ( ? : ) in PHP as a shorthand for "if / else"?

The ternary operator is just a shorthand for and if/else block. Your working code does not have an else condition, so is not suitable for this.

The following example will work:

echo empty($address['street2']) ? 'empty' : 'not empty';

How Should I Set Default Python Version In Windows?

Try modifying the path in the windows registry (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment).

Caveat: Don't break the registry :)

Installing Node.js (and npm) on Windows 10

go to http://nodejs.org/

and hit the button that says "Download For ..."

This'll download the .msi (or .pkg for mac) which will do all the installation and paths for you, unlike the selected answer.

Difference between static STATIC_URL and STATIC_ROOT on Django

STATICFILES_DIRS: You can keep the static files for your project here e.g. the ones used by your templates.

STATIC_ROOT: leave this empty, when you do manage.py collectstatic, it will search for all the static files on your system and move them here. Your static file server is supposed to be mapped to this folder wherever it is located. Check it after running collectstatic and you'll find the directory structure django has built.

--------Edit----------------

As pointed out by @DarkCygnus, STATIC_ROOT should point at a directory on your filesystem, the folder should be empty since it will be populated by Django.

STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')

or

STATIC_ROOT = '/opt/web/project/static_files'

--------End Edit -----------------

STATIC_URL: '/static/' is usually fine, it's just a prefix for static files.

List changes unexpectedly after assignment. How do I clone or copy it to prevent this?

This is because, the line new_list = my_list assigns a new reference to the variable my_list which is new_list This is similar to the C code given below,

int my_list[] = [1,2,3,4];
int *new_list;
new_list = my_list;

You should use the copy module to create a new list by

import copy
new_list = copy.deepcopy(my_list)

Copy table to a different database on a different SQL Server

Create the database, with Script Database as... CREATE To

Within SSMS on the source server, use the export wizard with the destination server database as the destination.

  • Source instance > YourDatabase > Tasks > Export data
  • Data Soure = SQL Server Native Client
    • Validate/enter Server & Database
  • Destination = SQL Server Native Client
    • Validate/enter Server & Database
  • Follow through wizard

Efficiently getting all divisors of a given number

int result_num;
bool flag;

cout << "Number          Divisors\n";

for (int number = 1; number <= 35; number++)
{
    flag = false;
    cout << setw(3) << number << setw(14);

    for (int i = 1; i <= number; i++) 
    {
        result_num = number % i;

        if (result_num == 0 && flag == true)
        {
            cout << "," << i;
        }

        if (result_num == 0 && flag == false)
        {
            cout << i;
        }

        flag = true;
    }

    cout << endl;   
}
cout << "Press enter to continue.....";
cin.ignore();
return 0;
}

How schedule build in Jenkins?

The steps for schedule jobs in Jenkins:

  1. click on "Configure" of the job requirement
  2. scroll down to "Build Triggers" - subtitle
  3. Click on the checkBox of Build periodically
  4. Add time schedule in the Schedule field, for example, @midnight

enter image description here

Note: under the schedule field, can see the last and the next date-time run.

Jenkins also supports predefined aliases to schedule build:

@hourly, @daily, @weekly, @monthly, @midnight

@hourly --> Build every hour at the beginning of the hour --> 0 * * * *

@daily, @midnight --> Build every day at midnight --> 0 0 * * *

@weekly --> Build every week at midnight on Sunday morning --> 0 0 * * 0

@monthly --> Build every month at midnight of the first day of the month --> 0 0 1 * *

How to Set RadioButtonFor() in ASp.net MVC 2 as Checked by default

You can also add labels that are tied to your radio buttons with the same ID, which then allows the user to click the radio button or label to select that item. I'm using constants here for "Male", "Female" and "Unknown", but obviously these could be strings in your model.

<%: Html.RadioButtonFor(m => m.Gender, "Male", 
    new Dictionary<string, object> { { "checked", "checked" }, { "id", "Male" } }) %>
<%: Html.Label("Male") %>

<%: Html.RadioButtonFor(m => m.Gender, "Female", 
    new Dictionary<string, object> { { "id", "Female" } }) %>
<%: Html.Label("Female")%>

<%: Html.RadioButtonFor(m => m.Gender, "Unknown",
    new Dictionary<string, object> { { "id", "Unknown" } }) %>
<%: Html.Label("Unknown")%>

android get real path by Uri.getPath()

EDIT: Use this Solution here: https://stackoverflow.com/a/20559175/2033223 Works perfect!

First of, thank for your solution @luizfelipetx

I changed your solution a little bit. This works for me:

public static String getRealPathFromDocumentUri(Context context, Uri uri){
    String filePath = "";

    Pattern p = Pattern.compile("(\\d+)$");
    Matcher m = p.matcher(uri.toString());
    if (!m.find()) {
        Log.e(ImageConverter.class.getSimpleName(), "ID for requested image not found: " + uri.toString());
        return filePath;
    }
    String imgId = m.group();

    String[] column = { MediaStore.Images.Media.DATA };
    String sel = MediaStore.Images.Media._ID + "=?";

    Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            column, sel, new String[]{ imgId }, null);

    int columnIndex = cursor.getColumnIndex(column[0]);

    if (cursor.moveToFirst()) {
        filePath = cursor.getString(columnIndex);
    }
    cursor.close();

    return filePath;
}

Note: So we got documents and image, depending, if the image comes from 'recents', 'gallery' or what ever. So I extract the image ID first before looking it up.

Downloading images with node.js

Building on the above, if anyone needs to handle errors in the write/read streams, I used this version. Note the stream.read() in case of a write error, it's required so we can finish reading and trigger close on the read stream.

var download = function(uri, filename, callback){
  request.head(uri, function(err, res, body){
    if (err) callback(err, filename);
    else {
        var stream = request(uri);
        stream.pipe(
            fs.createWriteStream(filename)
                .on('error', function(err){
                    callback(error, filename);
                    stream.read();
                })
            )
        .on('close', function() {
            callback(null, filename);
        });
    }
  });
};

"NOT IN" clause in LINQ to Entities

If you are using an in-memory collection as your filter, it's probably best to use the negation of Contains(). Note that this can fail if the list is too long, in which case you will need to choose another strategy (see below for using a strategy for a fully DB-oriented query).

   var exceptionList = new List<string> { "exception1", "exception2" };

   var query = myEntities.MyEntity
                         .Select(e => e.Name)
                         .Where(e => !exceptionList.Contains(e.Name));

If you're excluding based on another database query using Except might be a better choice. (Here is a link to the supported Set extensions in LINQ to Entities)

   var exceptionList = myEntities.MyOtherEntity
                                 .Select(e => e.Name);

   var query = myEntities.MyEntity
                         .Select(e => e.Name)
                         .Except(exceptionList);

This assumes a complex entity in which you are excluding certain ones depending some property of another table and want the names of the entities that are not excluded. If you wanted the entire entity, then you'd need to construct the exceptions as instances of the entity class such that they would satisfy the default equality operator (see docs).

Centering a background image, using CSS

Had the same problem. Used display and margin properties and it worked.

.background-image {
  background: url('yourimage.jpg') no-repeat;
  display: block;
  margin-left: auto;
  margin-right: auto;
  height: whateveryouwantpx;
  width: whateveryouwantpx;
}

TCPDF Save file to folder?

You may try;

$this->Output(/path/to/file);

So for you, it will be like;

$this->Output(/kuitit/);  //or try ("/kuitit/")

How unique is UUID?

If by "given enough time" you mean 100 years and you're creating them at a rate of a billion a second, then yes, you have a 50% chance of having a collision after 100 years.

Pandas read_csv from url

As I commented you need to use a StringIO object and decode i.e c=pd.read_csv(io.StringIO(s.decode("utf-8"))) if using requests, you need to decode as .content returns bytes if you used .text you would just need to pass s as is s = requests.get(url).text c = pd.read_csv(StringIO(s)).

A simpler approach is to pass the correct url of the raw data directly to read_csv, you don't have to pass a file like object, you can pass a url so you don't need requests at all:

c = pd.read_csv("https://raw.githubusercontent.com/cs109/2014_data/master/countries.csv")

print(c)

Output:

                              Country         Region
0                             Algeria         AFRICA
1                              Angola         AFRICA
2                               Benin         AFRICA
3                            Botswana         AFRICA
4                             Burkina         AFRICA
5                             Burundi         AFRICA
6                            Cameroon         AFRICA
..................................

From the docs:

filepath_or_buffer :

string or file handle / StringIO The string could be a URL. Valid URL schemes include http, ftp, s3, and file. For file URLs, a host is expected. For instance, a local file could be file ://localhost/path/to/table.csv

javascript cell number validation

This function check the special chars on key press and eliminates the value if it is not a number

function mobilevalid(id) {

    var feild = document.getElementById(id);

    if (isNaN(feild.value) == false) {
        if (feild.value.length == 1) {
            if (feild.value < 7) {
                feild.value = "";
            }
        } else if (feild.value.length > 10) {
            feild.value = feild.value.substr(0, feild.value.length - 1);
        }
        if (feild.value.charAt(0) < 7) {
            feild.value = "";
        }
    } else {
        feild.value = "";
    }

}

How to implement 2D vector array?

I use this piece of code . works fine for me .copy it and run on your computer. you'll understand by yourself .

#include <iostream>
#include <vector>
using namespace std;
int main()
{
    vector <vector <int> > matrix;
    size_t row=3 , col=3 ;
    for(int i=0,cnt=1 ; i<row ; i++)
    {
        for(int j=0 ; j<col ; j++)
        {
            vector <int> colVector ;
            matrix.push_back(colVector) ;
            matrix.at(i).push_back(cnt++) ;
        }
    }
    matrix.at(1).at(1) = 0;     //matrix.at(columns).at(rows) = intValue 
    //printing all elements
    for(int i=0,cnt=1 ; i<row ; i++)
    {
        for(int j=0 ; j<col ; j++)
        {
            cout<<matrix[i][j] <<" " ;
        }
        cout<<endl ;
    }
}

Multiple -and -or in PowerShell Where-Object statement

You're using curvy-braces when you should be using parentheses.

A where statement is kept inside a scriptblock, which is defined using curvy baces { }. To isolate/wrap you tests, you should use parentheses ().

I would also suggest trying to do the filtering on the remote computer. Try:

Invoke-Command -computername SERVERNAME {
    Get-ChildItem -path E:\dfsroots\datastore2\public |
    Where-Object { ($_.extension -eq "xls" -or $_.extension -eq "xlk") -and $_.creationtime -ge "06/01/2014" }
}

Rename a column in MySQL

for mysql version 5

alter table *table_name* change column *old_column_name* *new_column_name* datatype();

Reduce left and right margins in matplotlib plot

plt.savefig("circle.png", bbox_inches='tight',pad_inches=-1)