Programs & Examples On #Popupcontrolextender

The PopupExtender is part of the AJAX Control Toolkit for ASP.net

Warning: Use the 'defaultValue' or 'value' props on <select> instead of setting 'selected' on <option>

With Hooks and useState

Use defaultValue to select the default value.

    const statusOptions = [
        { value: 1, label: 'Publish' },
        { value: 0, label: 'Unpublish' }
    ];
    const [statusValue, setStatusValue] = useState('');
    const handleStatusChange = e => {
        setStatusValue(e.value);
    }

return(
<>
<Select options={statusOptions} 
    defaultValue={[{ value: published, label: published == 1 ? 'Publish' : 'Unpublish' }]} 
    onChange={handleStatusChange} 
    value={statusOptions.find(obj => obj.value === statusValue)} required />
</>
)

"The system cannot find the file specified" when running C++ program

Since this thread is one of the top results for that error and has no fix yet, I'll post what I found to fix it, originally found in this thread: Build Failure? "Unable to start program... The system cannot find the file specificed" which lead me to this thread: Error 'LINK : fatal error LNK1123: failure during conversion to COFF: file invalid or corrupt' after installing Visual Studio 2012 Release Preview

Basically all I did is this: Project Properties -> Configuration Properties -> Linker (General) -> Enable Incremental Linking -> "No (/INCREMENTAL:NO)"

Unable to set default python version to python3 in ubuntu

To change Python 3.6.8 as the default in Ubuntu 18.04 from Python 2.7 you can try the command line tool update-alternatives.

sudo update-alternatives --config python

If you get the error "no alternatives for python" then set up an alternative yourself with the following command:

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 2

Change the path /usr/bin/python3 to your desired python version accordingly.

The last argument specified it priority means, if no manual alternative selection is made the alternative with the highest priority number will be set. In our case we have set a priority 2 for /usr/bin/python3.6.8 and as a result the /usr/bin/python3.6.8 was set as default python version automatically by update-alternatives command.

we can anytime switch between the above listed python alternative versions using below command and entering a selection number:

update-alternatives --config python

What causes: "Notice: Uninitialized string offset" to appear?

Try to test and initialize your arrays before you use them :

if( !isset($catagory[$i]) ) $catagory[$i] = '' ;
if( !isset($task[$i]) ) $task[$i] = '' ;
if( !isset($fullText[$i]) ) $fullText[$i] = '' ;
if( !isset($dueDate[$i]) ) $dueDate[$i] = '' ;
if( !isset($empId[$i]) ) $empId[$i] = '' ;

If $catagory[$i] doesn't exist, you create (Uninitialized) one ... that's all ; => PHP try to read on your table in the address $i, but at this address, there's nothing, this address doesn't exist => PHP return you a notice, and it put nothing to you string. So you code is not very clean, it takes you some resources that down you server's performance (just a very little).

Take care about your MySQL tables default values

if( !isset($dueDate[$i]) ) $dueDate[$i] = '0000-00-00 00:00:00' ;

or

if( !isset($dueDate[$i]) ) $dueDate[$i] = 'NULL' ;

How can I have a newline in a string in sh?

If you're using Bash, the solution is to use $'string', for example:

$ STR=$'Hello\nWorld'
$ echo "$STR" # quotes are required here!
Hello
World

If you're using pretty much any other shell, just insert the newline as-is in the string:

$ STR='Hello
> World'

Bash is pretty nice. It accepts more than just \n in the $'' string. Here is an excerpt from the Bash manual page:

   Words of the form $'string' are treated specially.  The word expands to
   string, with backslash-escaped characters replaced as specified by  the
   ANSI  C  standard.  Backslash escape sequences, if present, are decoded
   as follows:
          \a     alert (bell)
          \b     backspace
          \e
          \E     an escape character
          \f     form feed
          \n     new line
          \r     carriage return
          \t     horizontal tab
          \v     vertical tab
          \\     backslash
          \'     single quote
          \"     double quote
          \nnn   the eight-bit character whose value is  the  octal  value
                 nnn (one to three digits)
          \xHH   the  eight-bit  character  whose value is the hexadecimal
                 value HH (one or two hex digits)
          \cx    a control-x character

   The expanded result is single-quoted, as if the  dollar  sign  had  not
   been present.

   A double-quoted string preceded by a dollar sign ($"string") will cause
   the string to be translated according to the current  locale.   If  the
   current  locale  is  C  or  POSIX,  the dollar sign is ignored.  If the
   string is translated and replaced, the replacement is double-quoted.

Importing class/java files in Eclipse

import class folder does not work for me, but add jar worked!

1. put the class folder under the project folder

2. Zip the class folder

3. Highlight project name, click "Project" in the top toolbar, click "Properties", click "Libraries" tab, click "Add External jars".

4. Add the zip file. Done!

What is the best way to get all the divisors of a number?

Adapted from CodeReview, here is a variant which works with num=1 !

from itertools import product
import operator

def prod(ls):
   return reduce(operator.mul, ls, 1)

def powered(factors, powers):
   return prod(f**p for (f,p) in zip(factors, powers))


def divisors(num) :

   pf = dict(prime_factors(num))
   primes = pf.keys()
   #For each prime, possible exponents
   exponents = [range(i+1) for i in pf.values()]
   return (powered(primes,es) for es in product(*exponents))

Keyboard shortcut to change font size in Eclipse?

In Eclipse Neon.3, as well as in the new Eclipse Photon (4.8.0), I can resize the font easily with Ctrl + Shift + + and -, without any plugin or special key binding.

At least in Editor Windows (this does not work in other Views like Console, Project Explorer etc).

How to run multiple SQL commands in a single SQL connection?

Multiple Non-query example if anyone is interested.

using (OdbcConnection DbConnection = new OdbcConnection("ConnectionString"))
{
  DbConnection.Open();
  using (OdbcCommand DbCommand = DbConnection.CreateCommand())
  {
    DbCommand.CommandText = "INSERT...";
    DbCommand.Parameters.Add("@Name", OdbcType.Text, 20).Value = "name";
    DbCommand.ExecuteNonQuery();

    DbCommand.Parameters.Clear();
    DbCommand.Parameters.Add("@Name", OdbcType.Text, 20).Value = "name2";
    DbCommand.ExecuteNonQuery();
  }
}

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

Only a few characters in the Windows code page 1252 (Latin-1) are not allowed as names. Note that the Windows Explorer will strip leading spaces from names and not allow you to call a files space dot something (like ?.txt), although this is allowed in the file system! Only a space and no file extension is invalid however.

If you create files through e.g. a Python script (this is what I did), then you can easily find out what is actually allowed and in what order the characters get sorted. The sort order varies based on your locale! Below are the results of my script, run with Python 2.7.15 on a German Windows 10 Pro 64bit:

Allowed:

       32  20  SPACE
!      33  21  EXCLAMATION MARK
#      35  23  NUMBER SIGN
$      36  24  DOLLAR SIGN
%      37  25  PERCENT SIGN
&      38  26  AMPERSAND
'      39  27  APOSTROPHE
(      40  28  LEFT PARENTHESIS
)      41  29  RIGHT PARENTHESIS
+      43  2B  PLUS SIGN
,      44  2C  COMMA
-      45  2D  HYPHEN-MINUS
.      46  2E  FULL STOP
/      47  2F  SOLIDUS
0      48  30  DIGIT ZERO
1      49  31  DIGIT ONE
2      50  32  DIGIT TWO
3      51  33  DIGIT THREE
4      52  34  DIGIT FOUR
5      53  35  DIGIT FIVE
6      54  36  DIGIT SIX
7      55  37  DIGIT SEVEN
8      56  38  DIGIT EIGHT
9      57  39  DIGIT NINE
;      59  3B  SEMICOLON
=      61  3D  EQUALS SIGN
@      64  40  COMMERCIAL AT
A      65  41  LATIN CAPITAL LETTER A
B      66  42  LATIN CAPITAL LETTER B
C      67  43  LATIN CAPITAL LETTER C
D      68  44  LATIN CAPITAL LETTER D
E      69  45  LATIN CAPITAL LETTER E
F      70  46  LATIN CAPITAL LETTER F
G      71  47  LATIN CAPITAL LETTER G
H      72  48  LATIN CAPITAL LETTER H
I      73  49  LATIN CAPITAL LETTER I
J      74  4A  LATIN CAPITAL LETTER J
K      75  4B  LATIN CAPITAL LETTER K
L      76  4C  LATIN CAPITAL LETTER L
M      77  4D  LATIN CAPITAL LETTER M
N      78  4E  LATIN CAPITAL LETTER N
O      79  4F  LATIN CAPITAL LETTER O
P      80  50  LATIN CAPITAL LETTER P
Q      81  51  LATIN CAPITAL LETTER Q
R      82  52  LATIN CAPITAL LETTER R
S      83  53  LATIN CAPITAL LETTER S
T      84  54  LATIN CAPITAL LETTER T
U      85  55  LATIN CAPITAL LETTER U
V      86  56  LATIN CAPITAL LETTER V
W      87  57  LATIN CAPITAL LETTER W
X      88  58  LATIN CAPITAL LETTER X
Y      89  59  LATIN CAPITAL LETTER Y
Z      90  5A  LATIN CAPITAL LETTER Z
[      91  5B  LEFT SQUARE BRACKET
\\     92  5C  REVERSE SOLIDUS
]      93  5D  RIGHT SQUARE BRACKET
^      94  5E  CIRCUMFLEX ACCENT
_      95  5F  LOW LINE
`      96  60  GRAVE ACCENT
a      97  61  LATIN SMALL LETTER A
b      98  62  LATIN SMALL LETTER B
c      99  63  LATIN SMALL LETTER C
d     100  64  LATIN SMALL LETTER D
e     101  65  LATIN SMALL LETTER E
f     102  66  LATIN SMALL LETTER F
g     103  67  LATIN SMALL LETTER G
h     104  68  LATIN SMALL LETTER H
i     105  69  LATIN SMALL LETTER I
j     106  6A  LATIN SMALL LETTER J
k     107  6B  LATIN SMALL LETTER K
l     108  6C  LATIN SMALL LETTER L
m     109  6D  LATIN SMALL LETTER M
n     110  6E  LATIN SMALL LETTER N
o     111  6F  LATIN SMALL LETTER O
p     112  70  LATIN SMALL LETTER P
q     113  71  LATIN SMALL LETTER Q
r     114  72  LATIN SMALL LETTER R
s     115  73  LATIN SMALL LETTER S
t     116  74  LATIN SMALL LETTER T
u     117  75  LATIN SMALL LETTER U
v     118  76  LATIN SMALL LETTER V
w     119  77  LATIN SMALL LETTER W
x     120  78  LATIN SMALL LETTER X
y     121  79  LATIN SMALL LETTER Y
z     122  7A  LATIN SMALL LETTER Z
{     123  7B  LEFT CURLY BRACKET
}     125  7D  RIGHT CURLY BRACKET
~     126  7E  TILDE
\x7f  127  7F  DELETE
\x80  128  80  EURO SIGN
\x81  129  81  
\x82  130  82  SINGLE LOW-9 QUOTATION MARK
\x83  131  83  LATIN SMALL LETTER F WITH HOOK
\x84  132  84  DOUBLE LOW-9 QUOTATION MARK
\x85  133  85  HORIZONTAL ELLIPSIS
\x86  134  86  DAGGER
\x87  135  87  DOUBLE DAGGER
\x88  136  88  MODIFIER LETTER CIRCUMFLEX ACCENT
\x89  137  89  PER MILLE SIGN
\x8a  138  8A  LATIN CAPITAL LETTER S WITH CARON
\x8b  139  8B  SINGLE LEFT-POINTING ANGLE QUOTATION
\x8c  140  8C  LATIN CAPITAL LIGATURE OE
\x8d  141  8D  
\x8e  142  8E  LATIN CAPITAL LETTER Z WITH CARON
\x8f  143  8F  
\x90  144  90  
\x91  145  91  LEFT SINGLE QUOTATION MARK
\x92  146  92  RIGHT SINGLE QUOTATION MARK
\x93  147  93  LEFT DOUBLE QUOTATION MARK
\x94  148  94  RIGHT DOUBLE QUOTATION MARK
\x95  149  95  BULLET
\x96  150  96  EN DASH
\x97  151  97  EM DASH
\x98  152  98  SMALL TILDE
\x99  153  99  TRADE MARK SIGN
\x9a  154  9A  LATIN SMALL LETTER S WITH CARON
\x9b  155  9B  SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
\x9c  156  9C  LATIN SMALL LIGATURE OE
\x9d  157  9D  
\x9e  158  9E  LATIN SMALL LETTER Z WITH CARON
\x9f  159  9F  LATIN CAPITAL LETTER Y WITH DIAERESIS
\xa0  160  A0  NON-BREAKING SPACE
\xa1  161  A1  INVERTED EXCLAMATION MARK
\xa2  162  A2  CENT SIGN
\xa3  163  A3  POUND SIGN
\xa4  164  A4  CURRENCY SIGN
\xa5  165  A5  YEN SIGN
\xa6  166  A6  PIPE, BROKEN VERTICAL BAR
\xa7  167  A7  SECTION SIGN
\xa8  168  A8  SPACING DIAERESIS - UMLAUT
\xa9  169  A9  COPYRIGHT SIGN
\xaa  170  AA  FEMININE ORDINAL INDICATOR
\xab  171  AB  LEFT DOUBLE ANGLE QUOTES
\xac  172  AC  NOT SIGN
\xad  173  AD  SOFT HYPHEN
\xae  174  AE  REGISTERED TRADE MARK SIGN
\xaf  175  AF  SPACING MACRON - OVERLINE
\xb0  176  B0  DEGREE SIGN
\xb1  177  B1  PLUS-OR-MINUS SIGN
\xb2  178  B2  SUPERSCRIPT TWO - SQUARED
\xb3  179  B3  SUPERSCRIPT THREE - CUBED
\xb4  180  B4  ACUTE ACCENT - SPACING ACUTE
\xb5  181  B5  MICRO SIGN
\xb6  182  B6  PILCROW SIGN - PARAGRAPH SIGN
\xb7  183  B7  MIDDLE DOT - GEORGIAN COMMA
\xb8  184  B8  SPACING CEDILLA
\xb9  185  B9  SUPERSCRIPT ONE
\xba  186  BA  MASCULINE ORDINAL INDICATOR
\xbb  187  BB  RIGHT DOUBLE ANGLE QUOTES
\xbc  188  BC  FRACTION ONE QUARTER
\xbd  189  BD  FRACTION ONE HALF
\xbe  190  BE  FRACTION THREE QUARTERS
\xbf  191  BF  INVERTED QUESTION MARK
\xc0  192  C0  LATIN CAPITAL LETTER A WITH GRAVE
\xc1  193  C1  LATIN CAPITAL LETTER A WITH ACUTE
\xc2  194  C2  LATIN CAPITAL LETTER A WITH CIRCUMFLEX
\xc3  195  C3  LATIN CAPITAL LETTER A WITH TILDE
\xc4  196  C4  LATIN CAPITAL LETTER A WITH DIAERESIS
\xc5  197  C5  LATIN CAPITAL LETTER A WITH RING ABOVE
\xc6  198  C6  LATIN CAPITAL LETTER AE
\xc7  199  C7  LATIN CAPITAL LETTER C WITH CEDILLA
\xc8  200  C8  LATIN CAPITAL LETTER E WITH GRAVE
\xc9  201  C9  LATIN CAPITAL LETTER E WITH ACUTE
\xca  202  CA  LATIN CAPITAL LETTER E WITH CIRCUMFLEX
\xcb  203  CB  LATIN CAPITAL LETTER E WITH DIAERESIS
\xcc  204  CC  LATIN CAPITAL LETTER I WITH GRAVE
\xcd  205  CD  LATIN CAPITAL LETTER I WITH ACUTE
\xce  206  CE  LATIN CAPITAL LETTER I WITH CIRCUMFLEX
\xcf  207  CF  LATIN CAPITAL LETTER I WITH DIAERESIS
\xd0  208  D0  LATIN CAPITAL LETTER ETH
\xd1  209  D1  LATIN CAPITAL LETTER N WITH TILDE
\xd2  210  D2  LATIN CAPITAL LETTER O WITH GRAVE
\xd3  211  D3  LATIN CAPITAL LETTER O WITH ACUTE
\xd4  212  D4  LATIN CAPITAL LETTER O WITH CIRCUMFLEX
\xd5  213  D5  LATIN CAPITAL LETTER O WITH TILDE
\xd6  214  D6  LATIN CAPITAL LETTER O WITH DIAERESIS
\xd7  215  D7  MULTIPLICATION SIGN
\xd8  216  D8  LATIN CAPITAL LETTER O WITH SLASH
\xd9  217  D9  LATIN CAPITAL LETTER U WITH GRAVE
\xda  218  DA  LATIN CAPITAL LETTER U WITH ACUTE
\xdb  219  DB  LATIN CAPITAL LETTER U WITH CIRCUMFLEX
\xdc  220  DC  LATIN CAPITAL LETTER U WITH DIAERESIS
\xdd  221  DD  LATIN CAPITAL LETTER Y WITH ACUTE
\xde  222  DE  LATIN CAPITAL LETTER THORN
\xdf  223  DF  LATIN SMALL LETTER SHARP S
\xe0  224  E0  LATIN SMALL LETTER A WITH GRAVE
\xe1  225  E1  LATIN SMALL LETTER A WITH ACUTE
\xe2  226  E2  LATIN SMALL LETTER A WITH CIRCUMFLEX
\xe3  227  E3  LATIN SMALL LETTER A WITH TILDE
\xe4  228  E4  LATIN SMALL LETTER A WITH DIAERESIS
\xe5  229  E5  LATIN SMALL LETTER A WITH RING ABOVE
\xe6  230  E6  LATIN SMALL LETTER AE
\xe7  231  E7  LATIN SMALL LETTER C WITH CEDILLA
\xe8  232  E8  LATIN SMALL LETTER E WITH GRAVE
\xe9  233  E9  LATIN SMALL LETTER E WITH ACUTE
\xea  234  EA  LATIN SMALL LETTER E WITH CIRCUMFLEX
\xeb  235  EB  LATIN SMALL LETTER E WITH DIAERESIS
\xec  236  EC  LATIN SMALL LETTER I WITH GRAVE
\xed  237  ED  LATIN SMALL LETTER I WITH ACUTE
\xee  238  EE  LATIN SMALL LETTER I WITH CIRCUMFLEX
\xef  239  EF  LATIN SMALL LETTER I WITH DIAERESIS
\xf0  240  F0  LATIN SMALL LETTER ETH
\xf1  241  F1  LATIN SMALL LETTER N WITH TILDE
\xf2  242  F2  LATIN SMALL LETTER O WITH GRAVE
\xf3  243  F3  LATIN SMALL LETTER O WITH ACUTE
\xf4  244  F4  LATIN SMALL LETTER O WITH CIRCUMFLEX
\xf5  245  F5  LATIN SMALL LETTER O WITH TILDE
\xf6  246  F6  LATIN SMALL LETTER O WITH DIAERESIS
\xf7  247  F7  DIVISION SIGN
\xf8  248  F8  LATIN SMALL LETTER O WITH SLASH
\xf9  249  F9  LATIN SMALL LETTER U WITH GRAVE
\xfa  250  FA  LATIN SMALL LETTER U WITH ACUTE
\xfb  251  FB  LATIN SMALL LETTER U WITH CIRCUMFLEX
\xfc  252  FC  LATIN SMALL LETTER U WITH DIAERESIS
\xfd  253  FD  LATIN SMALL LETTER Y WITH ACUTE
\xfe  254  FE  LATIN SMALL LETTER THORN
\xff  255  FF  LATIN SMALL LETTER Y WITH DIAERESIS

Forbidden:

\x00    0  00  NULL CHAR
\x01    1  01  START OF HEADING
\x02    2  02  START OF TEXT
\x03    3  03  END OF TEXT
\x04    4  04  END OF TRANSMISSION
\x05    5  05  ENQUIRY
\x06    6  06  ACKNOWLEDGEMENT
\x07    7  07  BELL
\x08    8  08  BACK SPACE
\t      9  09  HORIZONTAL TAB
\n     10  0A  LINE FEED
\x0b   11  0B  VERTICAL TAB
\x0c   12  0C  FORM FEED
\r     13  0D  CARRIAGE RETURN
\x0e   14  0E  SHIFT OUT / X-ON
\x0f   15  0F  SHIFT IN / X-OFF
\x10   16  10  DATA LINE ESCAPE
\x11   17  11  DEVICE CONTROL 1 (OFT. XON)
\x12   18  12  DEVICE CONTROL 2
\x13   19  13  DEVICE CONTROL 3 (OFT. XOFF)
\x14   20  14  DEVICE CONTROL 4
\x15   21  15  NEGATIVE ACKNOWLEDGEMENT
\x16   22  16  SYNCHRONOUS IDLE
\x17   23  17  END OF TRANSMIT BLOCK
\x18   24  18  CANCEL
\x19   25  19  END OF MEDIUM
\x1a   26  1A  SUBSTITUTE
\x1b   27  1B  ESCAPE
\x1c   28  1C  FILE SEPARATOR
\x1d   29  1D  GROUP SEPARATOR
\x1e   30  1E  RECORD SEPARATOR
\x1f   31  1F  UNIT SEPARATOR
"      34  22  QUOTATION MARK
*      42  2A  ASTERISK
:      58  3A  COLON
<      60  3C  LESS-THAN SIGN
>      62  3E  GREATER-THAN SIGN
?      63  3F  QUESTION MARK
|     124  7C  VERTICAL LINE

Screenshot of how Explorer sorts the files for me:

German Windows Explorer

The highlighted file with the ? white smiley face was added manually by me (Alt+1) to show where this Unicode character (U+263A) ends up, see Jimbugs' answer.

The first file has a space as name (0x20), the second is the non-breaking space (0xa0). The files in the bottom half of the third row which look like they have no name use the characters with hex codes 0x81, 0x8D, 0x8F, 0x90, 0x9D (in this order from top to bottom).

CSS: Control space between bullet and <li>

The following solution works well when you want to move the text closer to the bullet and even if you have multiple lines of text.

margin-right allows you to move the text closer to the bullet

text-indent ensures that multiple lines of text still line up correctly

_x000D_
_x000D_
li:before {_x000D_
  content: "";_x000D_
  margin-right: -5px; /* Adjust this to move text closer to the bullet */_x000D_
}_x000D_
_x000D_
li {_x000D_
  text-indent: 5px; /* Aligns second line of text */_x000D_
}
_x000D_
<ul>_x000D_
  <li> Item 1 ... </li>_x000D_
  <li> Item 2 ... this item has tons and tons of text that causes a second line! Notice how even the second line is lined up with the first!</li>_x000D_
  <li> Item 3 ... </li>_x000D_
</ul>
_x000D_
_x000D_
_x000D_

enter image description here

Is there a way to remove unused imports and declarations from Angular 2+?

As of Visual Studio Code Release 1.22 this comes free without the need of an extension.

Shift+Alt+O will take care of you.

How to split a string with angularJS

You could try this:

$scope.testdata = [{ 'name': 'name,id' }, {'name':'someName,someId'}]
$scope.array= [];
angular.forEach($scope.testdata, function (value, key) {
    $scope.array.push({ 'name': value.name.split(',')[0], 'id': value.name.split(',')[1] });
});
console.log($scope.array)

This way you can save the data for later use and acces it by using an ng-repeat like this:

<div ng-repeat="item in array">{{item.name}}{{item.id}}</div>


I hope this helped someone,
Plunker link: here
All credits go to @jwpfox and @Mohideen ibn Mohammed from the answer above.

How to output only captured groups with sed?

Give up and use Perl

Since sed does not cut it, let's just throw the towel and use Perl, at least it is LSB while grep GNU extensions are not :-)

  • Print the entire matching part, no matching groups or lookbehind needed:

    cat <<EOS | perl -lane 'print m/\d+/g'
    a1 b2
    a34 b56
    EOS
    

    Output:

    12
    3456
    
  • Single match per line, often structured data fields:

    cat <<EOS | perl -lape 's/.*?a(\d+).*/$1/g'
    a1 b2
    a34 b56
    EOS
    

    Output:

    1
    34
    

    With lookbehind:

    cat <<EOS | perl -lane 'print m/(?<=a)(\d+)/'
    a1 b2
    a34 b56
    EOS
    
  • Multiple fields:

    cat <<EOS | perl -lape 's/.*?a(\d+).*?b(\d+).*/$1 $2/g'
    a1 c0 b2 c0
    a34 c0 b56 c0
    EOS
    

    Output:

    1 2
    34 56
    
  • Multiple matches per line, often unstructured data:

    cat <<EOS | perl -lape 's/.*?a(\d+)|.*/$1 /g'
    a1 b2
    a34 b56 a78 b90
    EOS
    

    Output:

    1 
    34 78
    

    With lookbehind:

    cat EOS<< | perl -lane 'print m/(?<=a)(\d+)/g'
    a1 b2
    a34 b56 a78 b90
    EOS
    

    Output:

    1
    3478
    

Get name of currently executing test in JUnit 4

String testName = null;
StackTraceElement[] trace = Thread.currentThread().getStackTrace();
for (int i = trace.length - 1; i > 0; --i) {
    StackTraceElement ste = trace[i];
    try {
        Class<?> cls = Class.forName(ste.getClassName());
        Method method = cls.getDeclaredMethod(ste.getMethodName());
        Test annotation = method.getAnnotation(Test.class);
        if (annotation != null) {
            testName = ste.getClassName() + "." + ste.getMethodName();
            break;
        }
    } catch (ClassNotFoundException e) {
    } catch (NoSuchMethodException e) {
    } catch (SecurityException e) {
    }
}

Add carriage return to a string

I propose use StringBuilder

string s1 = "'99024','99050','99070','99143','99173','99191','99201','99202','99203','99204','99211','99212','99213','99214','99215','99217','99218','99219','99221','99222','99231','99232','99238','99239','99356','99357','99371','99374','99381','99382','99383','99384','99385','99386','99391','99392'";

var stringBuilder = new StringBuilder();           

foreach (var s in s1.Split(','))
{
    stringBuilder.Append(s).Append(",").AppendLine();
}
Console.WriteLine(stringBuilder);

Spring Boot - How to log all requests and responses with exceptions in single place?

In order to log requests that result in 400 only:

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.AbstractRequestLoggingFilter;
import org.springframework.web.filter.OncePerRequestFilter;
import org.springframework.web.util.ContentCachingRequestWrapper;
import org.springframework.web.util.WebUtils;

/**
 * Implementation is partially copied from {@link AbstractRequestLoggingFilter} and modified to output request information only if request resulted in 400.
 * Unfortunately {@link AbstractRequestLoggingFilter} is not smart enough to expose {@link HttpServletResponse} value in afterRequest() method.
 */
@Component
public class RequestLoggingFilter extends OncePerRequestFilter {

    public static final String DEFAULT_AFTER_MESSAGE_PREFIX = "After request [";

    public static final String DEFAULT_AFTER_MESSAGE_SUFFIX = "]";

    private final boolean includeQueryString = true;
    private final boolean includeClientInfo = true;
    private final boolean includeHeaders = true;
    private final boolean includePayload = true;

    private final int maxPayloadLength = (int) (2 * FileUtils.ONE_MB);

    private final String afterMessagePrefix = DEFAULT_AFTER_MESSAGE_PREFIX;

    private final String afterMessageSuffix = DEFAULT_AFTER_MESSAGE_SUFFIX;

    /**
     * The default value is "false" so that the filter may log a "before" message
     * at the start of request processing and an "after" message at the end from
     * when the last asynchronously dispatched thread is exiting.
     */
    @Override
    protected boolean shouldNotFilterAsyncDispatch() {
        return false;
    }

    @Override
    protected void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response, final FilterChain filterChain)
            throws ServletException, IOException {

        final boolean isFirstRequest = !isAsyncDispatch(request);
        HttpServletRequest requestToUse = request;

        if (includePayload && isFirstRequest && !(request instanceof ContentCachingRequestWrapper)) {
            requestToUse = new ContentCachingRequestWrapper(request, maxPayloadLength);
        }

        final boolean shouldLog = shouldLog(requestToUse);

        try {
            filterChain.doFilter(requestToUse, response);
        } finally {
            if (shouldLog && !isAsyncStarted(requestToUse)) {
                afterRequest(requestToUse, response, getAfterMessage(requestToUse));
            }
        }
    }

    private String getAfterMessage(final HttpServletRequest request) {
        return createMessage(request, this.afterMessagePrefix, this.afterMessageSuffix);
    }

    private String createMessage(final HttpServletRequest request, final String prefix, final String suffix) {
        final StringBuilder msg = new StringBuilder();
        msg.append(prefix);
        msg.append("uri=").append(request.getRequestURI());

        if (includeQueryString) {
            final String queryString = request.getQueryString();
            if (queryString != null) {
                msg.append('?').append(queryString);
            }
        }

        if (includeClientInfo) {
            final String client = request.getRemoteAddr();
            if (StringUtils.hasLength(client)) {
                msg.append(";client=").append(client);
            }
            final HttpSession session = request.getSession(false);
            if (session != null) {
                msg.append(";session=").append(session.getId());
            }
            final String user = request.getRemoteUser();
            if (user != null) {
                msg.append(";user=").append(user);
            }
        }

        if (includeHeaders) {
            msg.append(";headers=").append(new ServletServerHttpRequest(request).getHeaders());
        }

        if (includeHeaders) {
            final ContentCachingRequestWrapper wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper.class);
            if (wrapper != null) {
                final byte[] buf = wrapper.getContentAsByteArray();
                if (buf.length > 0) {
                    final int length = Math.min(buf.length, maxPayloadLength);
                    String payload;
                    try {
                        payload = new String(buf, 0, length, wrapper.getCharacterEncoding());
                    } catch (final UnsupportedEncodingException ex) {
                        payload = "[unknown]";
                    }
                    msg.append(";payload=").append(payload);
                }
            }
        }
        msg.append(suffix);
        return msg.toString();
    }

    private boolean shouldLog(final HttpServletRequest request) {
        return true;
    }

    private void afterRequest(final HttpServletRequest request, final HttpServletResponse response, final String message) {
        if (response.getStatus() == HttpStatus.BAD_REQUEST.value()) {
            logger.warn(message);
        }
    }

}

Compare data of two Excel Columns A & B, and show data of Column A that do not exist in B

Suppose you have data in A1:A10 and B1:B10 and you want to highlight which values in A1:A10 do not appear in B1:B10.

Try as follows:

  1. Format > Conditional Formating...
  2. Select 'Formula Is' from drop down menu
  3. Enter the following formula:

    =ISERROR(MATCH(A1,$B$1:$B$10,0))

  4. Now select the format you want to highlight the values in col A that do not appear in col B

This will highlight any value in Col A that does not appear in Col B.

What is the difference between Spring, Struts, Hibernate, JavaServer Faces, Tapestry?

Tapestry pages and components are simple POJO's(Plain Old Java Object) consisting of getters and setters for easy access to Java language features.

How do I use DateTime.TryParse with a Nullable<DateTime>?

This is the one liner you're looking fo:

DateTime? d = DateTime.TryParse("some date text", out DateTime dt) ? dt : null;

If you want to make it a proper TryParse pseudo-extension method, you can do this:

public static bool TryParse(string text, out DateTime? dt)
{
    if (DateTime.TryParse(text, out DateTime date))
    {
        dt = date;
        return true;
    }
    else
    {
        dt = null;
        return false;
    }
}

Long Press in JavaScript?

You can use jquery Touch events. (see here)

  let holdBtn = $('#holdBtn')
  let holdDuration = 1000
  let holdTimer

  holdBtn.on('touchend', function () {
    // finish hold
  });
  holdBtn.on('touchstart', function () {
    // start hold
    holdTimer = setTimeout(function() {
      //action after certain time of hold
    }, holdDuration );
  });

ng-repeat finish event

If you simply wants to change the class name so it will rendered differently, below code would do the trick.

<div>
<div ng-show="loginsuccess" ng-repeat="i in itemList">
    <div id="{{i.status}}" class="{{i.status}}">
        <div class="listitems">{{i.item}}</div>
        <div class="listitems">{{i.qty}}</div>
        <div class="listitems">{{i.date}}</div>
        <div class="listbutton">
            <button ng-click="UpdateStatus(i.$id)" class="btn"><span>Done</span></button>
            <button ng-click="changeClass()" class="btn"><span>Remove</span></button>
        </div>
    <hr>
</div>

This code worked for me when I had a similar requirement to render the shopped item in my shopping list in Strick trough font.

How to run regasm.exe from command line other than Visual Studio command prompt?

I use the following in a batch file:

path = %path%;C:\Windows\Microsoft.NET\Framework\v2.0.50727
regasm httpHelper\bin\Debug\httpHelper.dll /tlb:.\httpHelper.tlb /codebase
pause

CSS to make HTML page footer stay at bottom of the page with a minimum height, but not overlap the page

I consider you can set the main content to viewport height, so if the content exceeds, the height of the main content will define the position of the footer

_x000D_
_x000D_
* {
  margin: 0;
  padding: 0;
  width: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

header {
  height: 50px;
  background: red;
}

main {
  background: blue;
  /* This is the most important part*/
  height: 100vh; 
  
}
footer{
  background: black;
  height: 50px;
  bottom: 0;
}
_x000D_
<header></header>
<main></main>
<footer></footer>
_x000D_
_x000D_
_x000D_

Create a pointer to two-dimensional array

To fully understand this, you must grasp the following concepts:

Arrays are not pointers!

First of all (And it's been preached enough), arrays are not pointers. Instead, in most uses, they 'decay' to the address to their first element, which can be assigned to a pointer:

int a[] = {1, 2, 3};

int *p = a; // p now points to a[0]

I assume it works this way so that the array's contents can be accessed without copying all of them. That's just a behavior of array types and is not meant to imply that they are same thing.



Multidimensional arrays

Multidimensional arrays are just a way to 'partition' memory in a way that the compiler/machine can understand and operate on.

For instance, int a[4][3][5] = an array containing 4*3*5 (60) 'chunks' of integer-sized memory.

The advantage over using int a[4][3][5] vs plain int b[60] is that they're now 'partitioned' (Easier to work with their 'chunks', if needed), and the program can now perform bound checking.

In fact, int a[4][3][5] is stored exactly like int b[60] in memory - The only difference is that the program now manages it as if they're separate entities of certain sizes (Specifically, four groups of three groups of five).

Keep in mind: Both int a[4][3][5] and int b[60] are the same in memory, and the only difference is how they're handled by the application/compiler

{
  {1, 2, 3, 4, 5}
  {6, 7, 8, 9, 10}
  {11, 12, 13, 14, 15}
}
{
  {16, 17, 18, 19, 20}
  {21, 22, 23, 24, 25}
  {26, 27, 28, 29, 30}
}
{
  {31, 32, 33, 34, 35}
  {36, 37, 38, 39, 40}
  {41, 42, 43, 44, 45}
}
{
  {46, 47, 48, 49, 50}
  {51, 52, 53, 54, 55}
  {56, 57, 58, 59, 60}
}

From this, you can clearly see that each "partition" is just an array that the program keeps track of.



Syntax

Now, arrays are syntactically different from pointers. Specifically, this means the compiler/machine will treat them differently. This may seem like a no brainer, but take a look at this:

int a[3][3];

printf("%p %p", a, a[0]);

The above example prints the same memory address twice, like this:

0x7eb5a3b4 0x7eb5a3b4

However, only one can be assigned to a pointer so directly:

int *p1 = a[0]; // RIGHT !

int *p2 = a; // WRONG !

Why can't a be assigned to a pointer but a[0] can?

This, simply, is a consequence of multidimensional arrays, and I'll explain why:

At the level of 'a', we still see that we have another 'dimension' to look forward to. At the level of 'a[0]', however, we're already in the top dimension, so as far as the program is concerned we're just looking at a normal array.

You may be asking:

Why does it matter if the array is multidimensional in regards to making a pointer for it?

It's best to think this way:

A 'decay' from a multidimensional array is not just an address, but an address with partition data (AKA it still understands that its underlying data is made of other arrays), which consists of boundaries set by the array beyond the first dimension.

This 'partition' logic cannot exist within a pointer unless we specify it:

int a[4][5][95][8];

int (*p)[5][95][8];

p = a; // p = *a[0] // p = a+0

Otherwise, the meaning of the array's sorting properties are lost.

Also note the use of parenthesis around *p: int (*p)[5][95][8] - That's to specify that we're making a pointer with these bounds, not an array of pointers with these bounds: int *p[5][95][8]



Conclusion

Let's review:

  • Arrays decay to addresses if they have no other purpose in the used context
  • Multidimensional arrays are just arrays of arrays - Hence, the 'decayed' address will carry the burden of "I have sub dimensions"
  • Dimension data cannot exist in a pointer unless you give it to it.

In brief: multidimensional arrays decay to addresses that carry the ability to understand their contents.

Best Free Text Editor Supporting *More Than* 4GB Files?

It's really tough to handle a 4G file as such. I used to handle larger text files, but I never used to load them in to my editor. I mostly used UltraEdit in my previous company, now I use Notepad++, but I would get just those parts which i needed to edit. (Most of the cases, the files never needed an edit).

Why do u want to load such a big file in to an editor? When I handled files of these size, I used GNU Core Utils. The most common operations i performed on those files were head ( to get the top 250k lines etc ), tail, split, sort, shuf, uniq etc. It's really powerful.

There's a lot of things you can do with GNU Core Utils. I would definitely recommend those, instead of a new editor.

Create text file and fill it using bash

Assuming you mean UNIX shell commands, just run

echo >> file.txt

echo prints a newline, and the >> tells the shell to append that newline to the file, creating if it doesn't already exist.

In order to properly answer the question, though, I'd need to know what you would want to happen if the file already does exist. If you wanted to replace its current contents with the newline, for example, you would use

echo > file.txt

EDIT: and in response to Justin's comment, if you want to add the newline only if the file didn't already exist, you can do

test -e file.txt || echo > file.txt

At least that works in Bash, I'm not sure if it also does in other shells.

ASP.NET document.getElementById('<%=Control.ClientID%>'); returns null

Is Button1 visible? I mean, from the server side. Make sure Button1.Visible is true.

Controls that aren't Visible won't be rendered in HTML, so although they are assigned a ClientID, they don't actually exist on the client side.

Checking whether a string starts with XXXX

I did a little experiment to see which of these methods

  • string.startswith('hello')
  • string.rfind('hello') == 0
  • string.rpartition('hello')[0] == ''
  • string.rindex('hello') == 0

are most efficient to return whether a certain string begins with another string.

Here is the result of one of the many test runs I've made, where each list is ordered to show the least time it took (in seconds) to parse 5 million of each of the above expressions during each iteration of the while loop I used:

['startswith: 1.37', 'rpartition: 1.38', 'rfind: 1.62', 'rindex: 1.62']
['startswith: 1.28', 'rpartition: 1.44', 'rindex: 1.67', 'rfind: 1.68']
['startswith: 1.29', 'rpartition: 1.42', 'rindex: 1.63', 'rfind: 1.64']
['startswith: 1.28', 'rpartition: 1.43', 'rindex: 1.61', 'rfind: 1.62']
['rpartition: 1.48', 'startswith: 1.48', 'rfind: 1.62', 'rindex: 1.67']
['startswith: 1.34', 'rpartition: 1.43', 'rfind: 1.64', 'rindex: 1.64']
['startswith: 1.36', 'rpartition: 1.44', 'rindex: 1.61', 'rfind: 1.63']
['startswith: 1.29', 'rpartition: 1.37', 'rindex: 1.64', 'rfind: 1.67']
['startswith: 1.34', 'rpartition: 1.44', 'rfind: 1.66', 'rindex: 1.68']
['startswith: 1.44', 'rpartition: 1.41', 'rindex: 1.61', 'rfind: 2.24']
['startswith: 1.34', 'rpartition: 1.45', 'rindex: 1.62', 'rfind: 1.67']
['startswith: 1.34', 'rpartition: 1.38', 'rindex: 1.67', 'rfind: 1.74']
['rpartition: 1.37', 'startswith: 1.38', 'rfind: 1.61', 'rindex: 1.64']
['startswith: 1.32', 'rpartition: 1.39', 'rfind: 1.64', 'rindex: 1.61']
['rpartition: 1.35', 'startswith: 1.36', 'rfind: 1.63', 'rindex: 1.67']
['startswith: 1.29', 'rpartition: 1.36', 'rfind: 1.65', 'rindex: 1.84']
['startswith: 1.41', 'rpartition: 1.44', 'rfind: 1.63', 'rindex: 1.71']
['startswith: 1.34', 'rpartition: 1.46', 'rindex: 1.66', 'rfind: 1.74']
['startswith: 1.32', 'rpartition: 1.46', 'rfind: 1.64', 'rindex: 1.74']
['startswith: 1.38', 'rpartition: 1.48', 'rfind: 1.68', 'rindex: 1.68']
['startswith: 1.35', 'rpartition: 1.42', 'rfind: 1.63', 'rindex: 1.68']
['startswith: 1.32', 'rpartition: 1.46', 'rfind: 1.65', 'rindex: 1.75']
['startswith: 1.37', 'rpartition: 1.46', 'rfind: 1.74', 'rindex: 1.75']
['startswith: 1.31', 'rpartition: 1.48', 'rfind: 1.67', 'rindex: 1.74']
['startswith: 1.44', 'rpartition: 1.46', 'rindex: 1.69', 'rfind: 1.74']
['startswith: 1.44', 'rpartition: 1.42', 'rfind: 1.65', 'rindex: 1.65']
['startswith: 1.36', 'rpartition: 1.44', 'rfind: 1.64', 'rindex: 1.74']
['startswith: 1.34', 'rpartition: 1.46', 'rfind: 1.61', 'rindex: 1.74']
['startswith: 1.35', 'rpartition: 1.56', 'rfind: 1.68', 'rindex: 1.69']
['startswith: 1.32', 'rpartition: 1.48', 'rindex: 1.64', 'rfind: 1.65']
['startswith: 1.28', 'rpartition: 1.43', 'rfind: 1.59', 'rindex: 1.66']

I believe that it is pretty obvious from the start that the startswith method would come out the most efficient, as returning whether a string begins with the specified string is its main purpose.

What surprises me is that the seemingly impractical string.rpartition('hello')[0] == '' method always finds a way to be listed first, before the string.startswith('hello') method, every now and then. The results show that using str.partition to determine if a string starts with another string is more efficient then using both rfind and rindex.

Another thing I've noticed is that string.rindex('hello') == 0 and string.rindex('hello') == 0 have a good battle going on, each rising from fourth to third place, and dropping from third to fourth place, which makes sense, as their main purposes are the same.

Here is the code:

from time import perf_counter

string = 'hello world'
places = dict()

while True:
    start = perf_counter()
    for _ in range(5000000):
        string.startswith('hello')
    end = perf_counter()
    places['startswith'] = round(end - start, 2)

    start = perf_counter()
    for _ in range(5000000):
        string.rfind('hello') == 0
    end = perf_counter()
    places['rfind'] = round(end - start, 2)

    start = perf_counter()
    for _ in range(5000000):
        string.rpartition('hello')[0] == ''
    end = perf_counter()
    places['rpartition'] = round(end - start, 2)

    start = perf_counter()
    for _ in range(5000000):
        string.rindex('hello') == 0
    end = perf_counter()
    places['rindex'] = round(end - start, 2)
    
    print([f'{b}: {str(a).ljust(4, "4")}' for a, b in sorted(i[::-1] for i in places.items())])

Storing database records into array

$memberId =$_SESSION['TWILLO']['Id'];

    $QueryServer=mysql_query("select * from smtp_server where memberId='".$memberId."'");
    $data = array();
    while($ser=mysql_fetch_assoc($QueryServer))
    {

     $data[$ser['Id']] =array('ServerName','ServerPort','Server_limit','email','password','status');

    }

Returning null in a method whose signature says return int?

int is a primitive, null is not a value that it can take on. You could change the method return type to return java.lang.Integer and then you can return null, and existing code that returns int will get autoboxed.

Nulls are assigned only to reference types, it means the reference doesn't point to anything. Primitives are not reference types, they are values, so they are never set to null.

Using the object wrapper java.lang.Integer as the return value means you are passing back an Object and the object reference can be null.

Set Encoding of File to UTF8 With BOM in Sublime Text 3

I can't set "UTF-8 with BOM" in the corner button either, but I can change it from the menu bar.

"File"->"Save with encoding"->"UTF-8 with BOM"

Is there a function in python to split a word into a list?

text = "just trying out"

word_list = []

for i in range(0, len(text)):
    word_list.append(text[i])
    i+=1

print(word_list)

['j', 'u', 's', 't', ' ', 't', 'r', 'y', 'i', 'n', 'g', ' ', 'o', 'u', 't']

Why not use tables for layout in HTML?

It's good to separate content from layout
But this is a fallacious argument; Cliche Thinking

It's a fallacious argument because HTML tables are layout! The content is the data in the table, the presentation is the table itself. This is why separating CSS from HTML can be very difficult at times. You're not separating content from presentation, you're separating presentation from presentation! A pile of nested divs is no different than a table - it's just a different set of tags.

The other problem with separating the HTML from the CSS is that they need intimate knowledge of one another - you really can't separate them fully. The tag layout in the HTML is tightly coupled with the CSS file no matter what you do.

I think tables vs divs comes down to the needs of your application.

In the application we develop at work, we needed a page layout where the pieces would dynamically size themselves to their content. I spent days trying to get this to work cross-browser with CSS and DIVs and it was a complete nightmare. We switched to tables and it all just worked.

However, we have a very closed audience for our product (we sell a piece of hardware with a web interface) and accessibility issues are not a concern for us. I don't know why screen readers can't deal with tables well, but I guess if that's the way it is then developers have to handle it.

How to show Alert Message like "successfully Inserted" after inserting to DB using ASp.net MVC3

The 'best' way to do this would be to set a property on a view object once the update is successful. You can then access this property in the view and inform the user accordingly.

Having said that it would be possible to trigger an alert from the controller code by doing something like this -

public ActionResult ActionName(PostBackData postbackdata)
{
    //your DB code
    return new JavascriptResult { Script = "alert('Successfully registered');" };
}

You can find further info in this question - How to display "Message box" using MVC3 controller

Username and password in command for git push

Yes, you can do

git push https://username:[email protected]/file.git --all

in this case https://username:[email protected]/file.git replace the origin in git push origin --all

To see more options for git push, try git help push

How best to include other scripts?

If it is in the same directory you can use dirname $0:

#!/bin/bash

source $(dirname $0)/incl.sh

echo "The main script"

Append to string variable

Like this:

var str = 'blah blah blah';
str += ' blah';

str += ' ' + 'and some more blah';

How to know if .keyup() is a character key (jQuery)

If you only need to exclude out enter, escape and spacebar keys, you can do the following:

$("#text1").keyup(function(event) {
if (event.keyCode != '13' && event.keyCode != '27' && event.keyCode != '32') {
     alert('test');
   }
});

See it actions here.

You can refer to the complete list of keycode here for your further modification.

How to reload the datatable(jquery) data?

None of these solutions worked for me, but I did do something similar to Masood's answer. Here it is for posterity. This assumes you have <table id="mytable"></table> in your page somewhere:

function generate_support_user_table() {
        $('#mytable').hide();
        $('#mytable').dataTable({
            ...
            "bDestroy": true,
            "fnInitComplete": function () { $('#support_user_table').show(); },
            ...
        });
}

The important parts are:

  1. bDestroy, which wipes out the current table before loading.
  2. The hide() call and fnInitComplete, which ensures that the table only appears after everything is loaded. Otherwise it resizes and looks weird while loading.

Just add the function call to $(document).ready() and you should be all set. It will load the table initially, as well as reload later on a button click or whatever.

Razor/CSHTML - Any Benefit over what we have?

Ex Microsoft Developer's Opinion

I worked on a core team for the MSDN website. Now, I use c# razor for ecommerce sites with my programming team and we focus heavy on jQuery front end with back end c# razor pages and LINQ-Entity memory database so the pages are 1-2 millisecond response times even on nested for loops with queries and no page caching. We don't use MVC, just plain ASP.NET with razor pages being mapped with URL Rewrite module for IIS 7, no ASPX pages or ViewState or server-side event programming at all. It doesn't have the extra (unnecessary) layers MVC puts in code constructs for the regex challenged. Less is more for us. Its all lean and mean but I give props to MVC for its testability but that's all.

Razor pages have no event life cycle like ASPX pages. Its just rendering as one requested page. C# is such a great language and Razor gets out of its way nicely to let it do its job. The anonymous typing with generics and linq make life so easy with c# and razor pages. Using Razor pages will help you think and code lighter.

One of the drawback of Razor and MVC is there is no ViewState-like persistence. I needed to implement a solution for that so I ended up writing a jQuery plugin for that here -> http://www.jasonsebring.com/dumbFormState which is an HTML 5 offline storage supported plugin for form state that is working in all major browsers now. It is just for form state currently but you can use window.sessionStorage or window.localStorage very simply to store any kind of state across postbacks or even page requests, I just bothered to make it autosave and namespace it based on URL and form index so you don't have to think about it.

Cannot obtain value of local or argument as it is not available at this instruction pointer, possibly because it has been optimized away

Check to see if you have a Debuggable attribute in your AssemblyInfo file. If there is, remove it and rebuild your solution to see if the local variables become available.

My debuggable attribute was set to: DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints which according to this MSDN article tells the JIT compiler to use optimizations. I removed this line from my AssemblyInfo.cs file and the local variables were available.

HTML email in outlook table width issue - content is wider than the specified table width

I guess problem is in width attributes in table and td remove 'px' for example

<table border="0" cellpadding="0" cellspacing="0" width="580px" style="background-color: #0290ba;">

Should be

<table border="0" cellpadding="0" cellspacing="0" width="580" style="background-color: #0290ba;">

Test if number is odd or even

PHP is converting null and an empty string automatically to a zero. That happens with modulo as well. Therefor will the code

$number % 2 == 0 or !($number & 1)

with value $number = '' or $number = null result in true. I test it therefor somewhat more extended:

function testEven($pArg){
    if(is_int($pArg) === true){
        $p = ($pArg % 2);
        if($p === 0){
            print "The input '".$pArg."' is even.<br>";
        }else{
            print "The input '".$pArg."' is odd.<br>";
        }
    }else{
        print "The input '".$pArg."' is not a number.<br>";
    }
}

The print is there for testing purposes, hence in practice it becomes:
function testEven($pArg){
    if(is_int($pArg)=== true){
        return $pArg%2;
    }
    return false;
}

This function returns 1 for any odd number, 0 for any even number and false when it is not a number. I always write === true or === false to let myself (and other programmers) know that the test is as intended.

Multiple FROMs - what it means

The first answer is too complex, historic, and uninformative for my tastes.


It's actually rather simple. Docker provides for a functionality called multi-stage builds the basic idea here is to,

  • Free you from having to manually remove what you don't want, by forcing you to whitelist what you do want,
  • Free resources that would otherwise be taken up because of Docker's implementation.

Let's start with the first. Very often with something like Debian you'll see.

RUN apt-get update \ 
  && apt-get dist-upgrade \
  && apt-get install <whatever> \
  && apt-get clean

We can explain all of this in terms of the above. The above command is chained together so it represents a single change with no intermediate Images required. If it was written like this,

RUN apt-get update ;
RUN apt-get dist-upgrade;
RUN apt-get install <whatever>;
RUN apt-get clean;

It would result in 3 more temporary intermediate Images. Having it reduced to one image, there is one remaining problem: apt-get clean doesn't clean up artifacts used in the install. If a Debian maintainer includes in his install a script that modifies the system that modification will also be present in the final solution (see something like pepperflashplugin-nonfree for an example of that).

By using a multi-stage build you get all the benefits of a single changed action, but it will require you to manually whitelist and copy over files that were introduced in the temporary image using the COPY --from syntax documented here. Moreover, it's a great solution where there is no alternative (like an apt-get clean), and you would otherwise have lots of un-needed files in your final image.

See also

Link to a section of a webpage

your jump link looks like this

<a href="#div_id">jump link</a>

Then make

<div id="div_id"></div>

the jump link will take you to that div

COUNT / GROUP BY with active record?

$this->db->select('overal_points');
$this->db->where('point_publish', 1);
$this->db->order_by('overal_points', 'desc'); 
$query = $this->db->get('company', 4)->result();

Get all parameters from JSP page

<%@ page import = "java.util.Map" %>
Map<String, String[]> parameters = request.getParameterMap();
for(String parameter : parameters.keySet()) {
    if(parameter.toLowerCase().startsWith("question")) {
        String[] values = parameters.get(parameter);
        //your code here
    }
}

PKIX path building failed in Java application

In my case the issue was resolved by installing Oracle's official JDK 10 as opposed to using the default OpenJDK that came with my Ubuntu. This is the guide I followed: https://www.linuxuprising.com/2018/04/install-oracle-java-10-in-ubuntu-or.html

Proper MIME type for .woff2 fonts

In IIS you can declare the mime type for WOFF2 font files by adding the following to your project's web.config:

<system.webServer>
  <staticContent>
    <remove fileExtension=".woff2" />
    <mimeMap fileExtension=".woff2" mimeType="font/woff2" />
  </staticContent>
</system.webServer>

Update: The mime type may be changing according to the latest W3C Editor's Draft WOFF2 spec. See Appendix A: Internet Media Type Registration section 6.5. WOFF 2.0 which states the latest proposed format is font/woff2

How to install "make" in ubuntu?

I have no idea what linux distribution "ubuntu centOS" is. Ubuntu and CentOS are two different distributions.

To answer the question in the header: To install make in ubuntu you have to install build-essentials

sudo apt-get install build-essential

Install Chrome extension form outside the Chrome Web Store

For regular Windows users who are not skilled with computers, it is practically not possible to install and use extensions from outside the Chrome Web Store.

Users of other operating systems (Linux, Mac, Chrome OS) can easily install unpacked extensions (in developer mode).
Windows users can also load an unpacked extension, but they will always see an information bubble with "Disable developer mode extensions" when they start Chrome or open a new incognito window, which is really annoying. The only way for Windows users to use unpacked extensions without such dialogs is to switch to Chrome on the developer channel, by installing https://www.google.com/chrome/browser/index.html?extra=devchannel#eula.

Extensions can be loaded in unpacked mode by following the following steps:

  1. Visit chrome://extensions (via omnibox or menu -> Tools -> Extensions).
  2. Enable Developer mode by ticking the checkbox in the upper-right corner.
  3. Click on the "Load unpacked extension..." button.
  4. Select the directory containing your unpacked extension.

If you have a crx file, then it needs to be extracted first. CRX files are zip files with a different header. Any capable zip program should be able to open it. If you don't have such a program, I recommend 7-zip.

These steps will work for almost every extension, except extensions that rely on their extension ID. If you use the previous method, you will get an extension with a random extension ID. If it is important to preserve the extension ID, then you need to know the public key of your CRX file and insert this in your manifest.json. I have previously given a detailed explanation on how to get and use this key at https://stackoverflow.com/a/21500707.

How to convert Integer to int?

Another simple way would be:

Integer i = new Integer("10");

if (i != null)
    int ip = Integer.parseInt(i.toString());

How to Disable GUI Button in Java

Rather than using booleans, why not just set the button to false when its clicked, so you do that in your actionPerformed method. Its more efficient..

if (command.equals("w"))
{
    FileConverter fc = new FileConverter();
    btnConvertDocuments.setEnabled(false);
}

check if array is empty (vba excel)

@jeminar has the best solution above.

I cleaned it up a bit though.

I recommend adding this to a FunctionsArray module

  • isInitialised=false is not needed because Booleans are false when created
  • On Error GoTo 0 wrap and indent code inside error blocks similar to with blocks for visibility. these methods should be avoided as much as possible but ... VBA ...
Function isInitialised(ByRef a() As Variant) As Boolean
    On Error Resume Next
    isInitialised = IsNumeric(UBound(a))
    On Error GoTo 0
End Function

How to Customize a Progress Bar In Android

There are two types of progress bars called determinate progress bar (fixed duration) and indeterminate progress bar (unknown duration).

Drawables for both of types of progress bar can be customized by defining drawable as xml resource. You can find more information about progress bar styles and customization at http://www.zoftino.com/android-progressbar-and-custom-progressbar-examples.

Customizing fixed or horizontal progress bar :

Below xml is a drawable resource for horizontal progress bar customization.

 <?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background"
        android:gravity="center_vertical|fill_horizontal">
        <shape android:shape="rectangle"
            android:tint="?attr/colorControlNormal">
            <corners android:radius="8dp"/>
            <size android:height="20dp" />
            <solid android:color="#90caf9" />
        </shape>
    </item>
    <item android:id="@android:id/progress"
        android:gravity="center_vertical|fill_horizontal">
        <scale android:scaleWidth="100%">
            <shape android:shape="rectangle"
                android:tint="?attr/colorControlActivated">
                <corners android:radius="8dp"/>
                <size android:height="20dp" />
                <solid android:color="#b9f6ca" />
            </shape>
        </scale>
    </item>
</layer-list>

Customizing indeterminate progress bar

Below xml is a drawable resource for circular progress bar customization.

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/progress"
        android:top="16dp"
        android:bottom="16dp">
                <rotate
                    android:fromDegrees="45"
                    android:pivotX="50%"
                    android:pivotY="50%"
                    android:toDegrees="315">
                    <shape android:shape="rectangle">
                        <size
                            android:width="80dp"
                            android:height="80dp" />
                        <stroke
                            android:width="6dp"
                            android:color="#b71c1c" />
                    </shape>
                </rotate>           
    </item>
</layer-list>

Angular - Can't make ng-repeat orderBy work

The orderBy only works with Arrays -- See http://docs.angularjs.org/api/ng.filter:orderBy

Also a great filter to use for Objects instead of Arrays @ Angularjs OrderBy on ng-repeat doesn't work

What online brokers offer APIs?

Looks like E*Trade has an API now.

For access to historical data, I've found EODData to have reasonable prices for their data dumps. For side projects, I can't afford (rather don't want to afford) a huge subscription fee just for some data to tinker with.

How to convert JSON data into a Python object

Check out the section titled Specializing JSON object decoding in the json module documentation. You can use that to decode a JSON object into a specific Python type.

Here's an example:

class User(object):
    def __init__(self, name, username):
        self.name = name
        self.username = username

import json
def object_decoder(obj):
    if '__type__' in obj and obj['__type__'] == 'User':
        return User(obj['name'], obj['username'])
    return obj

json.loads('{"__type__": "User", "name": "John Smith", "username": "jsmith"}',
           object_hook=object_decoder)

print type(User)  # -> <type 'type'>

Update

If you want to access data in a dictionary via the json module do this:

user = json.loads('{"__type__": "User", "name": "John Smith", "username": "jsmith"}')
print user['name']
print user['username']

Just like a regular dictionary.

Xcode warning: "Multiple build commands for output file"

Yet another variation on this issue. I had the same message come up none of the previously suggested solutions solved the problem (I definitely only had one copy of the offending file for instance).

My solution was to edit the project.pbxproj file in a text editor (after quitting XCode and backing up the file of course) and remove all references to the offending file. Then, after starting XCode again, I manually added the file back into the project and everything was ok.

(My suspicion is that this problem happened to me because of a manual, ie: non-XCode, merge of the project file.)

How to embed HTML into IPython output?

Expanding on @Harmon above, looks like you can combine the display and print statements together ... if you need. Or, maybe it's easier to just format your entire HTML as one string and then use display. Either way, nice feature.

display(HTML('<h1>Hello, world!</h1>'))
print("Here's a link:")
display(HTML("<a href='http://www.google.com' target='_blank'>www.google.com</a>"))
print("some more printed text ...")
display(HTML('<p>Paragraph text here ...</p>'))

Outputs something like this:


Hello, world!

Here's a link:

www.google.com

some more printed text ...

Paragraph text here ...


How to access parameters in a RESTful POST method

Your @POST method should be accepting a JSON object instead of a string. Jersey uses JAXB to support marshaling and unmarshaling JSON objects (see the jersey docs for details). Create a class like:

@XmlRootElement
public class MyJaxBean {
    @XmlElement public String param1;
    @XmlElement public String param2;
}

Then your @POST method would look like the following:

@POST @Consumes("application/json")
@Path("/create")
public void create(final MyJaxBean input) {
    System.out.println("param1 = " + input.param1);
    System.out.println("param2 = " + input.param2);
}

This method expects to receive JSON object as the body of the HTTP POST. JAX-RS passes the content body of the HTTP message as an unannotated parameter -- input in this case. The actual message would look something like:

POST /create HTTP/1.1
Content-Type: application/json
Content-Length: 35
Host: www.example.com

{"param1":"hello","param2":"world"}

Using JSON in this way is quite common for obvious reasons. However, if you are generating or consuming it in something other than JavaScript, then you do have to be careful to properly escape the data. In JAX-RS, you would use a MessageBodyReader and MessageBodyWriter to implement this. I believe that Jersey already has implementations for the required types (e.g., Java primitives and JAXB wrapped classes) as well as for JSON. JAX-RS supports a number of other methods for passing data. These don't require the creation of a new class since the data is passed using simple argument passing.


HTML <FORM>

The parameters would be annotated using @FormParam:

@POST
@Path("/create")
public void create(@FormParam("param1") String param1,
                   @FormParam("param2") String param2) {
    ...
}

The browser will encode the form using "application/x-www-form-urlencoded". The JAX-RS runtime will take care of decoding the body and passing it to the method. Here's what you should see on the wire:

POST /create HTTP/1.1
Host: www.example.com
Content-Type: application/x-www-form-urlencoded;charset=UTF-8
Content-Length: 25

param1=hello&param2=world

The content is URL encoded in this case.

If you do not know the names of the FormParam's you can do the following:

@POST @Consumes("application/x-www-form-urlencoded")
@Path("/create")
public void create(final MultivaluedMap<String, String> formParams) {
    ...
}

HTTP Headers

You can using the @HeaderParam annotation if you want to pass parameters via HTTP headers:

@POST
@Path("/create")
public void create(@HeaderParam("param1") String param1,
                   @HeaderParam("param2") String param2) {
    ...
}

Here's what the HTTP message would look like. Note that this POST does not have a body.

POST /create HTTP/1.1
Content-Length: 0
Host: www.example.com
param1: hello
param2: world

I wouldn't use this method for generalized parameter passing. It is really handy if you need to access the value of a particular HTTP header though.


HTTP Query Parameters

This method is primarily used with HTTP GETs but it is equally applicable to POSTs. It uses the @QueryParam annotation.

@POST
@Path("/create")
public void create(@QueryParam("param1") String param1,
                   @QueryParam("param2") String param2) {
    ...
}

Like the previous technique, passing parameters via the query string does not require a message body. Here's the HTTP message:

POST /create?param1=hello&param2=world HTTP/1.1
Content-Length: 0
Host: www.example.com

You do have to be particularly careful to properly encode query parameters on the client side. Using query parameters can be problematic due to URL length restrictions enforced by some proxies as well as problems associated with encoding them.


HTTP Path Parameters

Path parameters are similar to query parameters except that they are embedded in the HTTP resource path. This method seems to be in favor today. There are impacts with respect to HTTP caching since the path is what really defines the HTTP resource. The code looks a little different than the others since the @Path annotation is modified and it uses @PathParam:

@POST
@Path("/create/{param1}/{param2}")
public void create(@PathParam("param1") String param1,
                   @PathParam("param2") String param2) {
    ...
}

The message is similar to the query parameter version except that the names of the parameters are not included anywhere in the message.

POST /create/hello/world HTTP/1.1
Content-Length: 0
Host: www.example.com

This method shares the same encoding woes that the query parameter version. Path segments are encoded differently so you do have to be careful there as well.


As you can see, there are pros and cons to each method. The choice is usually decided by your clients. If you are serving FORM-based HTML pages, then use @FormParam. If your clients are JavaScript+HTML5-based, then you will probably want to use JAXB-based serialization and JSON objects. The MessageBodyReader/Writer implementations should take care of the necessary escaping for you so that is one fewer thing that can go wrong. If your client is Java based but does not have a good XML processor (e.g., Android), then I would probably use FORM encoding since a content body is easier to generate and encode properly than URLs are. Hopefully this mini-wiki entry sheds some light on the various methods that JAX-RS supports.

Note: in the interest of full disclosure, I haven't actually used this feature of Jersey yet. We were tinkering with it since we have a number of JAXB+JAX-RS applications deployed and are moving into the mobile client space. JSON is a much better fit that XML on HTML5 or jQuery-based solutions.

how to copy only the columns in a DataTable to another DataTable?

If only the columns are required then DataTable.Clone() can be used. With Clone function only the schema will be copied. But DataTable.Copy() copies both the structure and data

E.g.

DataTable dt = new DataTable();
dt.Columns.Add("Column Name");
dt.Rows.Add("Column Data");
DataTable dt1 = dt.Clone();
DataTable dt2 = dt.Copy();

dt1 will have only the one column but dt2 will have one column with one row.

Setting "checked" for a checkbox with jQuery

Here is the code and demo for how to check multiple check boxes...

http://jsfiddle.net/tamilmani/z8TTt/

$("#check").on("click", function () {

    var chk = document.getElementById('check').checked;
    var arr = document.getElementsByTagName("input");

    if (chk) {
        for (var i in arr) {
            if (arr[i].name == 'check') arr[i].checked = true;
        }
    } else {
        for (var i in arr) {
            if (arr[i].name == 'check') arr[i].checked = false;
        }
    }
});

Load and execute external js file in node.js with access to local variables?

If you are planning to load an external javascript file's functions or objects, load on this context using the following code – note the runInThisContext method:

var vm = require("vm");
var fs = require("fs");

var data = fs.readFileSync('./externalfile.js');
const script = new vm.Script(data);
script.runInThisContext();

// here you can use externalfile's functions or objects as if they were instantiated here. They have been added to this context. 

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

I ran into this while using node installed via nvm, with nvm installed via homebrew. I solved it by running brew uninstall nvm, rm -rf $NVM_DIR, then reinstalling nvm using the official install script and reinstalling the node version I needed.

Note: I also had $NVM_DIR mounted and symlinked. I moved it back into my homedir.

UDP vs TCP, how much faster is it?

UDP is slightly quicker in my experience, but not by much. The choice shouldn't be made on performance but on the message content and compression techniques.

If it's a protocol with message exchange, I'd suggest that the very slight performance hit you take with TCP is more than worth it. You're given a connection between two end points that will give you everything you need. Don't try and manufacture your own reliable two-way protocol on top of UDP unless you're really, really confident in what you're undertaking.

How to detect if a browser is Chrome using jQuery?

userAgent can be changed. for more robust, use the global variable specified by chrome

$.browser.chrome = (typeof window.chrome === "object");

How to set proxy for wget?

After trying many tutorials to configure my Ubuntu 16.04 LTS behind a authenticated proxy, it worked with these steps:

Edit /etc/wgetrc:

$ sudo nano /etc/wgetrc

Uncomment these lines:

#https_proxy = http://proxy.yoyodyne.com:18023/
#http_proxy = http://proxy.yoyodyne.com:18023/
#ftp_proxy = http://proxy.yoyodyne.com:18023/
#use_proxy = on

Change http://proxy.yoyodyne.com:18023/ to http://username:password@domain:port/

IMPORTANT: If it still doesn't work, check if your password has special characters, such as #, @, ... If this is the case, escape them (for example, replace passw@rd with passw%40rd).

Java switch statement: Constant expression required, but it IS constant

You can use an enum like in this example:

public class MainClass {
enum Choice { Choice1, Choice2, Choice3 }
public static void main(String[] args) {
Choice ch = Choice.Choice1;

switch(ch) {
  case Choice1:
    System.out.println("Choice1 selected");
    break;
 case Choice2:
   System.out.println("Choice2 selected");
   break;
 case Choice3:
   System.out.println("Choice3 selected");
   break;
    }
  }
}

Source: Switch statement with enum

Extract the first (or last) n characters of a string

Make it simple and use R basic functions:

# To get the LEFT part:
> substr(a, 1, 4)
[1] "left"
> 
# To get the MIDDLE part:
> substr(a, 3, 7)
[1] "ftrig"
> 
# To get the RIGHT part:
> substr(a, 5, 10)
[1] "right"

The substr() function tells you where start and stop substr(x, start, stop)

No grammar constraints (DTD or XML schema) detected for the document

I used a relative path in the xsi:noNamespaceSchemaLocation to provide the local xsd file (because I could not use a namespace in the instance xml).

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="../project/schema.xsd">
</root>

Validation works and the warning is fixed (not ignored).

https://www.w3schools.com/xml/schema_example.asp

How do I "break" out of an if statement?

if (test)
{
    ...
    goto jmp;
    ...
}
jmp:

Oh why not :)

.Net picking wrong referenced assembly version

This is what worked for me:

I was using the Microsoft.IdentityModel.Clients.ActiveDirectory version 3.19 in a class library project but only had version 2.22 installed in the actual ASP.NET Web Application project. Upgrading to 3.19 in the web app project got me past the error.

Copy file(s) from one project to another using post build event...VS2010

xcopy "$(ProjectDir)Views\Home\Index.cshtml" "$(SolutionDir)MEFMVCPOC\Views\Home"

and if you want to copy entire folders:

xcopy /E /Y "$(ProjectDir)Views" "$(SolutionDir)MEFMVCPOC\Views"

Update: here's the working version

xcopy "$(ProjectDir)Views\ModuleAHome\Index.cshtml" "$(SolutionDir)MEFMVCPOC\Views\ModuleAHome\" /Y /I

Here are some commonly used switches with xcopy:

  • /I - treat as a directory if copying multiple files.
  • /Q - Do not display the files being copied.
  • /S - Copy subdirectories unless empty.
  • /E - Copy empty subdirectories.
  • /Y - Do not prompt for overwrite of existing files.
  • /R - Overwrite read-only files.

get current page from url

You could try this below.

string url = "http://localhost:1302/TESTERS/Default6.aspx";

string fileName = System.IO.Path.GetFileName(url);

Hope this helps.

How do you run a command as an administrator from the Windows command line?

I would set up a shortcut, either to CMD or to the thing you want to run, then set the properties of the shortcut to require admin, and then run the shortcut from your batch file. I haven't tested to confirm it will respect the properties, but I think it's more elegant and doesn't require activating the Administrator account.

Also if you do it as a scheduled task (which can be set up from code) there is an option to run it elevated there.

How to use WebRequest to POST some data and read response?

From MSDN

// Create a request using a URL that can receive a post. 
WebRequest request = WebRequest.Create ("http://contoso.com/PostAccepter.aspx ");
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.
string postData = "This is a test that posts this string to a Web server.";
byte[] byteArray = Encoding.UTF8.GetBytes (postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = request.GetRequestStream ();
// Write the data to the request stream.
dataStream.Write (byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close ();
// Get the response.
WebResponse response = request.GetResponse ();
// Display the status.
Console.WriteLine (((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader (dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd ();
// Display the content.
Console.WriteLine (responseFromServer);
// Clean up the streams.
reader.Close ();
dataStream.Close ();
response.Close ();

Take into account that the information must be sent in the format key1=value1&key2=value2

How do I get an OAuth 2.0 authentication token in C#

I used ADAL.NET/ Microsoft Identity Platform to achieve this. The advantage of using it was that we get a nice wrapper around the code to acquire AccessToken and we get additional features like Token Cache out-of-the-box. From the documentation:

Why use ADAL.NET ?

ADAL.NET V3 (Active Directory Authentication Library for .NET) enables developers of .NET applications to acquire tokens in order to call secured Web APIs. These Web APIs can be the Microsoft Graph, or 3rd party Web APIs.

Here is the code snippet:

    // Import Nuget package: Microsoft.Identity.Client
    public class AuthenticationService
    {
         private readonly List<string> _scopes;
         private readonly IConfidentialClientApplication _app;

        public AuthenticationService(AuthenticationConfiguration authentication)
        {

             _app = ConfidentialClientApplicationBuilder
                         .Create(authentication.ClientId)
                         .WithClientSecret(authentication.ClientSecret)
                         .WithAuthority(authentication.Authority)
                         .Build();

           _scopes = new List<string> {$"{authentication.Audience}/.default"};
       }

       public async Task<string> GetAccessToken()
       {
           var authenticationResult = await _app.AcquireTokenForClient(_scopes) 
                                                .ExecuteAsync();
           return authenticationResult.AccessToken;
       }
   }

C - split string into an array of strings

Here is an example of how to use strtok borrowed from MSDN.

And the relevant bits, you need to call it multiple times. The token char* is the part you would stuff into an array (you can figure that part out).

char string[] = "A string\tof ,,tokens\nand some  more tokens";
char seps[]   = " ,\t\n";
char *token;

int main( void )
{
    printf( "Tokens:\n" );
    /* Establish string and get the first token: */
    token = strtok( string, seps );
    while( token != NULL )
    {
        /* While there are tokens in "string" */
        printf( " %s\n", token );
        /* Get next token: */
        token = strtok( NULL, seps );
    }
}

SQL TRUNCATE DATABASE ? How to TRUNCATE ALL TABLES

The accepted answer doesn't quite work when you have foreign key relationships. In that case you have to drop the constraints and recreate them. Below is a stored proc for doing that based on the answer here

CREATE PROCEDURE [dbo].[deleteAllDataFromAllTables] AS
SET NOCOUNT ON

    DECLARE @dropAndCreateConstraintsTable TABLE ( DropStmt varchar(max) , CreateStmt varchar(max) )

    insert @dropAndCreateConstraintsTable select
      DropStmt = 'ALTER TABLE [' + ForeignKeys.ForeignTableSchema + 
          '].[' + ForeignKeys.ForeignTableName + 
          '] DROP CONSTRAINT [' + ForeignKeys.ForeignKeyName + ']; '
    ,  CreateStmt = 'ALTER TABLE [' + ForeignKeys.ForeignTableSchema + 
          '].[' + ForeignKeys.ForeignTableName + 
          '] WITH CHECK ADD CONSTRAINT [' +  ForeignKeys.ForeignKeyName + 
          '] FOREIGN KEY([' + ForeignKeys.ForeignTableColumn + 
          ']) REFERENCES [' + schema_name(sys.objects.schema_id) + '].[' +
      sys.objects.[name] + ']([' +
      sys.columns.[name] + ']); '
     from sys.objects
      inner join sys.columns
        on (sys.columns.[object_id] = sys.objects.[object_id])
      inner join (
        select sys.foreign_keys.[name] as ForeignKeyName
         ,schema_name(sys.objects.schema_id) as ForeignTableSchema
         ,sys.objects.[name] as ForeignTableName
         ,sys.columns.[name]  as ForeignTableColumn
         ,sys.foreign_keys.referenced_object_id as referenced_object_id
         ,sys.foreign_key_columns.referenced_column_id as referenced_column_id
         from sys.foreign_keys
          inner join sys.foreign_key_columns
            on (sys.foreign_key_columns.constraint_object_id
              = sys.foreign_keys.[object_id])
          inner join sys.objects
            on (sys.objects.[object_id]
              = sys.foreign_keys.parent_object_id)
            inner join sys.columns
              on (sys.columns.[object_id]
                = sys.objects.[object_id])
               and (sys.columns.column_id
                = sys.foreign_key_columns.parent_column_id)
        ) ForeignKeys
        on (ForeignKeys.referenced_object_id = sys.objects.[object_id])
         and (ForeignKeys.referenced_column_id = sys.columns.column_id)
     where (sys.objects.[type] = 'U')
      and (sys.objects.[name] not in ('sysdiagrams'))


    DECLARE @DropStatement nvarchar(max)
    DECLARE @RecreateStatement nvarchar(max)

    DECLARE C1 CURSOR READ_ONLY
    FOR
    SELECT DropStmt from @dropAndCreateConstraintsTable
    OPEN C1

    FETCH NEXT FROM C1 INTO @DropStatement

    WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT 'Executing ' + @DropStatement
        execute sp_executesql @DropStatement
        FETCH NEXT FROM C1 INTO @DropStatement
    END
    CLOSE C1
    DEALLOCATE C1

    DECLARE @DeleteTableStatement nvarchar(max)
    DECLARE C2 CURSOR READ_ONLY
    FOR
    SELECT 'Delete From [dbo].[' + TABLE_NAME + ']' from INFORMATION_SCHEMA.TABLES 
        WHERE TABLE_SCHEMA = 'dbo' -- Change your schema appropriately.
    OPEN C2

    FETCH NEXT FROM C2 INTO @DeleteTableStatement

    WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT 'Executing ' + @DeleteTableStatement
        execute sp_executesql @DeleteTableStatement
        FETCH NEXT FROM C2 INTO  @DeleteTableStatement
    END
    CLOSE C2
    DEALLOCATE C2

    DECLARE C3 CURSOR READ_ONLY
    FOR
    SELECT CreateStmt from @dropAndCreateConstraintsTable
    OPEN C3

    FETCH NEXT FROM C3 INTO @RecreateStatement

    WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT 'Executing ' + @RecreateStatement
        execute sp_executesql @RecreateStatement
        FETCH NEXT FROM C3 INTO  @RecreateStatement
    END
    CLOSE C3
    DEALLOCATE C3

GO

How to get Domain name from URL using jquery..?

try this code below it works fine with me.

example below is getting the host and redirecting to another page.

var host = $(location).attr('host');
window.location.replace("http://"+host+"/TEST_PROJECT/INDEXINGPAGE");

Send Message in C#

public static extern int FindWindow(string lpClassName, String lpWindowName);

In order to find the window, you need the class name of the window. Here are some examples:

C#:

const string lpClassName = "Winamp v1.x";
IntPtr hwnd = FindWindow(lpClassName, null);

Example from a program that I made, written in VB:

hParent = FindWindow("TfrmMain", vbNullString)

In order to get the class name of a window, you'll need something called Win Spy

Once you have the handle of the window, you can send messages to it using the SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam) function.

hWnd, here, is the result of the FindWindow function. In the above examples, this will be hwnd and hParent. It tells the SendMessage function which window to send the message to.

The second parameter, wMsg, is a constant that signifies the TYPE of message that you are sending. The message might be a keystroke (e.g. send "the enter key" or "the space bar" to a window), but it might also be a command to close the window (WM_CLOSE), a command to alter the window (hide it, show it, minimize it, alter its title, etc.), a request for information within the window (getting the title, getting text within a text box, etc.), and so on. Some common examples include the following:

Public Const WM_CHAR = &H102
Public Const WM_SETTEXT = &HC
Public Const WM_KEYDOWN = &H100
Public Const WM_KEYUP = &H101
Public Const WM_LBUTTONDOWN = &H201
Public Const WM_LBUTTONUP = &H202
Public Const WM_CLOSE = &H10
Public Const WM_COMMAND = &H111
Public Const WM_CLEAR = &H303
Public Const WM_DESTROY = &H2
Public Const WM_GETTEXT = &HD
Public Const WM_GETTEXTLENGTH = &HE
Public Const WM_LBUTTONDBLCLK = &H203

These can be found with an API viewer (or a simple text editor, such as notepad) by opening (Microsoft Visual Studio Directory)/Common/Tools/WINAPI/winapi32.txt.

The next two parameters are certain details, if they are necessary. In terms of pressing certain keys, they will specify exactly which specific key is to be pressed.

C# example, setting the text of windowHandle with WM_SETTEXT:

x = SendMessage(windowHandle, WM_SETTEXT, new IntPtr(0), m_strURL);

More examples from a program that I made, written in VB, setting a program's icon (ICON_BIG is a constant which can be found in winapi32.txt):

Call SendMessage(hParent, WM_SETICON, ICON_BIG, ByVal hIcon)

Another example from VB, pressing the space key (VK_SPACE is a constant which can be found in winapi32.txt):

Call SendMessage(button%, WM_KEYDOWN, VK_SPACE, 0)
Call SendMessage(button%, WM_KEYUP, VK_SPACE, 0)

VB sending a button click (a left button down, and then up):

Call SendMessage(button%, WM_LBUTTONDOWN, 0, 0&)
Call SendMessage(button%, WM_LBUTTONUP, 0, 0&)

No idea how to set up the listener within a .DLL, but these examples should help in understanding how to send the message.

How can I call a WordPress shortcode within a template?

Make sure to enable the use of shortcodes in text widgets.

// To enable the use, add this in your *functions.php* file:
add_filter( 'widget_text', 'do_shortcode' );

// and then you can use it in any PHP file:  
<?php echo do_shortcode('[YOUR-SHORTCODE-NAME/TAG]'); ?>

Check the documentation for more.

PG COPY error: invalid input syntax for integer

I think it's better to change your csv file like:

"age","first_name","last_name"
23,Ivan,Poupkine
,Eugene,Pirogov

It's also possible to define your table like

CREATE TABLE people (
  age        varchar(20),
  first_name varchar(20),
  last_name  varchar(20)
);

and after copy, you can convert empty strings:

select nullif(age, '')::int as age, first_name, last_name
from people

How do I install a color theme for IntelliJ IDEA 7.0.x

If you just have the xml file of the color scheme you can:

Go to Preferences -> Editor -> Color and Fonts and use the Import button.

enter image description here

What does the NS prefix mean?

The original code for the Cocoa frameworks came from the NeXTSTEP libraries Foundation and AppKit (those names are still used by Apple's Cocoa frameworks), and the NextStep engineers chose to prefix their symbols with NS.

Because Objective-C is an extension of C and thus doesn't have namespaces like in C++, symbols must be prefixed with a unique prefix so that they don't collide. This is particularly important for symbols defined in a framework.

If you are writing an application, such that your code is only likely ever to use your symbols, you don't have to worry about this. But if you're writing a framework or library for others' use, you should also prefix your symbols with a unique prefix. CocoaDev has a page where many developers in the Cocoa community have listed their "chosen" prefixes. You may also find this SO discussion helpful.

How can I pass a parameter to a t-sql script?

SQL*Plus uses &1, &2... &n to access the parameters.

Suppose you have the following script test.sql:

SET SERVEROUTPUT ON
SPOOL test.log
EXEC dbms_output.put_line('&1 &2');
SPOOL off

you could call this script like this for example:

$ sqlplus login/pw @test Hello World!

Edit:

In a UNIX script you would usually call a SQL script like this:

sqlplus /nolog << EOF
connect user/password@db
@test.sql Hello World!
exit
EOF

so that your login/password won't be visible with another session's ps

node-request - Getting error "SSL23_GET_SERVER_HELLO:unknown protocol"

I got this error while connecting to Amazon RDS. I checked the server status 50% of CPU usage while it was a development server and no one is using it.

It was working before, and nothing in the connection configuration has changed. Rebooting the server fixed the issue for me.

How to correctly iterate through getElementsByClassName

According to MDN, the way to retrieve an item from a NodeList is:

nodeItem = nodeList.item(index)

Thus:

var slides = document.getElementsByClassName("slide");
for (var i = 0; i < slides.length; i++) {
   Distribute(slides.item(i));
}

I haven't tried this myself (the normal for loop has always worked for me), but give it a shot.

Python update a key in dict if it doesn't exist

You do not need to call d.keys(), so

if key not in d:
    d[key] = value

is enough. There is no clearer, more readable method.

You could update again with dict.get(), which would return an existing value if the key is already present:

d[key] = d.get(key, value)

but I strongly recommend against this; this is code golfing, hindering maintenance and readability.

No plot window in matplotlib

If you are user of Anaconda and Spyder then best solution for you is that :

Tools --> Preferences --> Ipython console --> Graphic Section

Then in the Support for graphics (Matplotlib) section:

select two avaliable options

and in the Graphics Backend:

select Automatic

How do I setup the InternetExplorerDriver so it works

This is just to help somebody in future. When we initiate InternetExplorerDriver() instance in a java project it uses IEDriver.exe (downloaded by individuals) which tries to extract temporary files in user's TEMP folder when it's not in path then ur busted.

Safest way is to provide your own extract path as shown below

System.setProperty("webdriver.ie.driver.extractpath", "F:\\Study\\");
System.setProperty("webdriver.ie.driver", "F:\\Study\\IEDriverServer.exe");
System.setProperty("webdriver.ie.logfile", "F:\\Study\\IEDriverServer.log");
InternetExplorerDriver d = new InternetExplorerDriver();
d.get("http://www.google.com");
d.quit();

How to check if a value exists in a dictionary (python)

Python dictionary has get(key) function

>>> d.get(key)

For Example,

>>> d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}
>>> d.get('3')
'three'
>>> d.get('10')
None

If your key does'nt exist, will return None value.

foo = d[key] # raise error if key doesn't exist
foo = d.get(key) # return None if key doesn't exist

Content relevant to versions less than 3.0 and greater than 5.0.

.

How to decrypt an encrypted Apple iTunes iPhone backup?

You should grab a copy of Erica Sadun's mdhelper command line utility (OS X binary & source). It supports listing and extracting the contents of iPhone/iPod Touch backups, including address book & SMS databases, and other application metadata and settings.

How can I turn a string into a list in Python?

The list() function [docs] will convert a string into a list of single-character strings.

>>> list('hello')
['h', 'e', 'l', 'l', 'o']

Even without converting them to lists, strings already behave like lists in several ways. For example, you can access individual characters (as single-character strings) using brackets:

>>> s = "hello"
>>> s[1]
'e'
>>> s[4]
'o'

You can also loop over the characters in the string as you can loop over the elements of a list:

>>> for c in 'hello':
...     print c + c,
... 
hh ee ll ll oo

Eclipse will not start and I haven't changed anything

Ok so i figured it out. Go to yourWorkspace/.metadata/.plugins and delete everything in there. Eclipse will start and repopulate the folder.

Does JSON syntax allow duplicate keys in an object?

SHOULD be unique does not mean MUST be unique. However, as stated, some parsers would fail and others would just use the last value parsed. However, if the spec was cleaned up a little to allow for duplicates then I could see a use where you may have an event handler which is transforming the JSON to HTML or some other format... In such cases it would be perfectly valid to parse the JSON and create another document format...

[
  "div":
  {
    "p": "hello",
    "p": "universe"
  },
  "div":
  {
    "h1": "Heading 1",
    "p": "another paragraph"
  }
]

could then easily parse to html for example:

<body>
 <div>
  <p>hello</p>
  <p>universe</p>
 </div>
 <div>
  <h1>Heading 1</h1>
  <p>another paragraph</p>
 </div>
</body>

I can see the reasoning behind the question but as it stands... I wouldn't trust it.

Laravel assets url

You have to do two steps:

  1. Put all your files (css,js,html code, etc.) into the public folder.
  2. Use url({{ URL::asset('images/slides/2.jpg') }}) where images/slides/2.jpg is path of your content.

Similarly you can call js, css etc.

count distinct values in spreadsheet

Link to Working Examples

Solution 0

This can be accompished using pivot tables.

Pivot table Example - Count rows by value

Solution 1

Use the unique formula to get all the distinct values. Then use countif to get the count of each value. See the working example link at the top to see exactly how this is implemented.

Unique Values        Count
=UNIQUE(A3:A8)       =COUNTIF(A3:A8;B3)
                     =COUNTIF(A3:A8;B4)
                     ...

Solution 2

If you setup your data as such:

City    
----    
London   1
Paris    1
London   1
Berlin   1
Rome     1
Paris    1

Then the following will produce the desired result.

=sort(transpose(query(A3:B8,"Select sum(B) pivot (A)")),2,FALSE)

I'm sure there is a way to get rid of the second column since all values will be 1. Not an ideal solution in my opinion.

via http://googledocsforlife.blogspot.com/2011/12/counting-unique-values-of-data-set.html

Other Possibly Helpful Links

Dynamic Height Issue for UITableView Cells (Swift)

Unfortunately, I am not sure what I was missing. The above methods don't work for me to get the xib cell's height or let the layoutifneeded()or UITableView.automaticDimension to do the height calculation. I've been searching and trying for 3 to 4 nights but could not find an answer. Some answers here or on another post did give me hints for the workaround though. It's a stupid method but it works. Just add all your cells into an Array. And then set the outlet of each of your height constraint in the xib storyboard. Finally, add them up in the heightForRowAt method. It's just straight forward if you are not familiar with the those APIs.

Swift 4.2

CustomCell.Swift

@IBOutlet weak var textViewOneHeight: NSLayoutConstraint!
@IBOutlet weak var textViewTwoHeight: NSLayoutConstraint!
@IBOutlet weak var textViewThreeHeight: NSLayoutConstraint!

@IBOutlet weak var textViewFourHeight: NSLayoutConstraint!
@IBOutlet weak var textViewFiveHeight: NSLayoutConstraint!

MyTableViewVC.Swift

.
.
var myCustomCells:[CustomCell] = []
.
.
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = Bundle.main.loadNibNamed("CustomCell", owner: self, options: nil)?.first as! CustomCell

.
.
myCustomCells.append(cell)
return cell

}


override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

   let totalHeight = myCustomCells[indexPath.row].textViewOneHeight.constant + myCustomCells[indexPath.row].textViewTwoHeight.constant +  myCustomCells[indexPath.row].textViewThreeHeight.constant + myCustomCells[indexPath.row].textViewFourHeight.constant + myCustomCells[indexPath.row].textViewFiveHeight.constant

  return totalHeight + 40 //some magic number


}

UTF-8 in Windows 7 CMD

This question has been already answered in Unicode characters in Windows command line - how?

You missed one step -> you need to use Lucida console fonts in addition to executing chcp 65001 from cmd console.

Assign a class name to <img> tag instead of write it in css file?

The short answer is adding a class directly to the element you want to style is indeed the most efficient way to target and style that Element. BUT, in real world scenarios it is so negligible that it is not an issue at all to worry about.

To quote Steve Ouders (CSS optimization expert) http://www.stevesouders.com/blog/2009/03/10/performance-impact-of-css-selectors/:

Based on tests I have the following hypothesis: For most web sites, the possible performance gains from optimizing CSS selectors will be small, and are not worth the costs.

Maintainability of code is much more important in real world scenarios. Since the underlying topic here is front-end performance; the real performance boosters for speedy page rendering are found in:

  • Make fewer HTTP requests
  • Use a CDN
  • Add an Expires header
  • Gzip components
  • Put stylesheets at the top
  • Put scripts at the bottom
  • Avoid CSS expressions
  • Make JS and CSS external
  • Reduce DNS lookups
  • Minify JS
  • Avoid redirects
  • Remove duplicate scripts
  • Configure ETags
  • Make AJAX cacheable

Source: http://stevesouders.com/docs/web20expo-20090402.ppt

So just to confirm, the answer is yes, example below is indeed faster but be aware of the bigger picture:

<div class="column">
   <img class="custom-style" alt="appropriate alt text" />
</div>

Recursively counting files in a Linux directory

For directories with spaces in the name ... (based on various answers above) -- recursively print directory name with number of files within:

find . -mindepth 1 -type d -print0 | while IFS= read -r -d '' i ; do echo -n $i": " ; ls -p "$i" | grep -v / | wc -l ; done

Example (formatted for readability):

pwd
  /mnt/Vancouver/Programming/scripts/claws/corpus

ls -l
  total 8
  drwxr-xr-x 2 victoria victoria 4096 Mar 28 15:02 'Catabolism - Autophagy; Phagosomes; Mitophagy'
  drwxr-xr-x 3 victoria victoria 4096 Mar 29 16:04 'Catabolism - Lysosomes'

ls 'Catabolism - Autophagy; Phagosomes; Mitophagy'/ | wc -l
  138

## 2 dir (one with 28 files; other with 1 file):
ls 'Catabolism - Lysosomes'/ | wc -l
  29

The directory structure is better visualized using tree:

tree -L 3 -F .
  .
  +-- Catabolism - Autophagy; Phagosomes; Mitophagy/
  ¦   +-- 1
  ¦   +-- 10
  ¦   +-- [ ... SNIP! (138 files, total) ... ]
  ¦   +-- 98
  ¦   +-- 99
  +-- Catabolism - Lysosomes/
      +-- 1
      +-- 10
      +-- [ ... SNIP! (28 files, total) ... ]
      +-- 8
      +-- 9
      +-- aaa/
          +-- bbb

  3 directories, 167 files

man find | grep mindep
  -mindepth levels
    Do not apply any tests or actions at levels less than levels
    (a non-negative integer).  -mindepth 1 means process all files
    except the starting-points.

ls -p | grep -v / (used below) is from answer 2 at https://unix.stackexchange.com/questions/48492/list-only-regular-files-but-not-directories-in-current-directory

find . -mindepth 1 -type d -print0 | while IFS= read -r -d '' i ; do echo -n $i": " ; ls -p "$i" | grep -v / | wc -l ; done
./Catabolism - Autophagy; Phagosomes; Mitophagy: 138
./Catabolism - Lysosomes: 28
./Catabolism - Lysosomes/aaa: 1

Applcation: I want to find the max number of files among several hundred directories (all depth = 1) [output below again formatted for readability]:

date; pwd
    Fri Mar 29 20:08:08 PDT 2019
    /home/victoria/Mail/2_RESEARCH - NEWS

time find . -mindepth 1 -type d -print0 | while IFS= read -r -d '' i ; do echo -n $i": " ; ls -p "$i" | grep -v / | wc -l ; done > ../../aaa
    0:00.03

[victoria@victoria 2_RESEARCH - NEWS]$ head -n5 ../../aaa
    ./RNA - Exosomes: 26
    ./Cellular Signaling - Receptors: 213
    ./Catabolism - Autophagy; Phagosomes; Mitophagy: 138
    ./Stress - Physiological, Cellular - General: 261
    ./Ancient DNA; Ancient Protein: 34

[victoria@victoria 2_RESEARCH - NEWS]$ sed -r 's/(^.*): ([0-9]{1,8}$)/\2: \1/g' ../../aaa | sort -V | (head; echo ''; tail)

    0: ./Genomics - Gene Drive
    1: ./Causality; Causal Relationships
    1: ./Cloning
    1: ./GenMAPP 2
    1: ./Pathway Interaction Database
    1: ./Wasps
    2: ./Cellular Signaling - Ras-MAPK Pathway
    2: ./Cell Death - Ferroptosis
    2: ./Diet - Apples
    2: ./Environment - Waste Management

    988: ./Genomics - PPM (Personalized & Precision Medicine)
    1113: ./Microbes - Pathogens, Parasites
    1418: ./Health - Female
    1420: ./Immunity, Inflammation - General
    1522: ./Science, Research - Miscellaneous
    1797: ./Genomics
    1910: ./Neuroscience, Neurobiology
    2740: ./Genomics - Functional
    3943: ./Cancer
    4375: ./Health - Disease 

sort -V is a natural sort. ... So, my max number of files in any of those (Claws Mail) directories is 4375 files. If I left-pad (https://stackoverflow.com/a/55409116/1904943) those filenames -- they are all named numerically, starting with 1, in each directory -- and pad to 5 total digits, I should be ok.


Addendum

Find the total number of files, subdirectories in a directory.

$ date; pwd
Tue 14 May 2019 04:08:31 PM PDT
/home/victoria/Mail/2_RESEARCH - NEWS

$ ls | head; echo; ls | tail
Acoustics
Ageing
Ageing - Calorie (Dietary) Restriction
Ageing - Senescence
Agriculture, Aquaculture, Fisheries
Ancient DNA; Ancient Protein
Anthropology, Archaeology
Ants
Archaeology
ARO-Relevant Literature, News

Transcriptome - CAGE
Transcriptome - FISSEQ
Transcriptome - RNA-seq
Translational Science, Medicine
Transposons
USACEHR-Relevant Literature
Vaccines
Vision, Eyes, Sight
Wasps
Women in Science, Medicine

$ find . -type f | wc -l
70214    ## files

$ find . -type d | wc -l
417      ## subdirectories

Java NIO FileChannel versus FileOutputstream performance / usefulness

My experience with larger files sizes has been that java.nio is faster than java.io. Solidly faster. Like in the >250% range. That said, I am eliminating obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:

The buffer size. The algorithm you basically have is

  • copy from disk to buffer
  • copy from buffer to disk

My own experience has been that this buffer size is ripe for tuning. I've settled on 4KB for one part of my application, 256KB for another. I suspect your code is suffering with such a large buffer. Run some benchmarks with buffers of 1KB, 2KB, 4KB, 8KB, 16KB, 32KB and 64KB to prove it to yourself.

Don't perform java benchmarks that read and write to the same disk.

If you do, then you are really benchmarking the disk, and not Java. I would also suggest that if your CPU is not busy, then you are probably experiencing some other bottleneck.

Don't use a buffer if you don't need to.

Why copy to memory if your target is another disk or a NIC? With larger files, the latency incured is non-trivial.

Like other have said, use FileChannel.transferTo() or FileChannel.transferFrom(). The key advantage here is that the JVM uses the OS's access to DMA (Direct Memory Access), if present. (This is implementation dependent, but modern Sun and IBM versions on general purpose CPUs are good to go.) What happens is the data goes straight to/from disc, to the bus, and then to the destination... bypassing any circuit through RAM or the CPU.

The web app I spent my days and night working on is very IO heavy. I've done micro benchmarks and real-world benchmarks too. And the results are up on my blog, have a look-see:

Use production data and environments

Micro-benchmarks are prone to distortion. If you can, make the effort to gather data from exactly what you plan to do, with the load you expect, on the hardware you expect.

My benchmarks are solid and reliable because they took place on a production system, a beefy system, a system under load, gathered in logs. Not my notebook's 7200 RPM 2.5" SATA drive while I watched intensely as the JVM work my hard disc.

What are you running on? It matters.

PHP: If internet explorer 6, 7, 8 , or 9

This is what I ended up using a variation of, which checks for IE8 and below:

if (preg_match('/MSIE\s(?P<v>\d+)/i', @$_SERVER['HTTP_USER_AGENT'], $B) && $B['v'] <= 8) {
    // Browsers IE 8 and below
} else {
    // All other browsers
}

Java 8 List<V> into Map<K, V>

List<V> choices; // your list
Map<K,V> result = choices.stream().collect(Collectors.toMap(choice::getKey(),choice));
//assuming class "V" has a method to get the key, this method must handle case of duplicates too and provide a unique key.

How to add values in a variable in Unix shell scripting?

var=$((count7 + count1))

Arithmetic in bash uses $((...)) syntax.

You do not need to $ symbol within the $(( ))

Content Security Policy "data" not working for base64 Images in Chrome 28

Try this

data to load:

<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'><path fill='#343a40' d='M2 0L0 2h4zm0 5L0 3h4z'/></svg>

get a utf8 to base64 convertor and convert the "svg" string to:

PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHZpZXdCb3g9JzAgMCA0IDUn
PjxwYXRoIGZpbGw9JyMzNDNhNDAnIGQ9J00yIDBMMCAyaDR6bTAgNUwwIDNoNHonLz48L3N2Zz4=

and the CSP is

img-src data: image/svg+xml;base64,PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHZpZXdCb3g9JzAgMCA0IDUn
PjxwYXRoIGZpbGw9JyMzNDNhNDAnIGQ9J00yIDBMMCAyaDR6bTAgNUwwIDNoNHonLz48L3N2Zz4=

Bootstrap 3: Offset isn't working?

There is no col-??-offset-0. All "rows" assume there is no offset unless it has been specified. I think you are wanting 3 rows on a small screen and 1 row on a medium screen.

To get the result I believe you are looking for try this:

<div class="container">
    <div class="row">
      <div class="col-sm-4 col-md-12">
        <p>On small screen there are 3 rows, and on a medium screen 1 row</p>
      </div>
      <div class="col-sm-4 col-md-12">
        <p>On small screen there are 3 rows, and on a medium screen 1 row</p>
      </div>
      <div class="col-sm-4 col-md-12">
        <p>On small screen there are 3 rows, and on a medium screen 1 row</p>
      </div>
    </div>
  </div>

Keep in mind you will only see a difference on a small tablet with what you described. Medium, large, and extra small screens the columns are spanning 12.

Hope this helps.

Display loading image while post with ajax

_x000D_
_x000D_
//$(document).ready(function(){_x000D_
//  $("a").click(function(event){_x000D_
//  event.preventDefault();_x000D_
//  $("div").html("This is prevent link...");_x000D_
// });_x000D_
//});   _x000D_
_x000D_
$(document).ready(function(){_x000D_
 $("a").click(function(event){_x000D_
  event.preventDefault();_x000D_
  $.ajax({_x000D_
   beforeSend: function(){_x000D_
    $('#text').html("<img src='ajax-loader.gif' /> Loading...");_x000D_
   },_x000D_
   success : function(){_x000D_
    setInterval(function(){ $('#text').load("cd_catalog.txt"); },1000);_x000D_
   }_x000D_
  });_x000D_
 });_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>_x000D_
  _x000D_
<a href="http://www.wantyourhelp.com">[click to redirect][1]</a>_x000D_
<div id="text"></div>
_x000D_
_x000D_
_x000D_

How do you check if a variable is an array in JavaScript?

This is an old question but having the same problem i found a very elegant solution that i want to share.

Adding a prototype to Array makes it very simple

Array.prototype.isArray = true;

Now once if you have an object you want to test to see if its an array all you need is to check for the new property

var box = doSomething();

if (box.isArray) {
    // do something
}

isArray is only available if its an array

What's the best way to check if a String represents an integer in Java?

How about:

return Pattern.matches("-?\\d+", input);

SMTP server response: 530 5.7.0 Must issue a STARTTLS command first

For Windows, I was able to get it working by enabling TLS for secure communication on the SMTP Virtual server. TLS will not be available on the SMTP virtual server without a certificate. This link will give the steps needed.

https://support.microsoft.com/en-ie/help/4014125/how-to-configure-iis-smtp-for-outgoing-tls-authentication

Calling a stored procedure in Oracle with IN and OUT parameters

Go to Menu Tool -> SQL Output, Run the PL/SQL statement, the output will show on SQL Output panel.

Keep SSH session alive

We can keep our ssh connection alive by having following Global configurations

Add the following line to the /etc/ssh/ssh_config file:

ServerAliveInterval 60

How to find the duration of difference between two dates in java?

It worked for me can try with this, hope it will be helpful . Let me know if any concern .

Date startDate = java.util.Calendar.getInstance().getTime(); //set your start time
Date endDate = java.util.Calendar.getInstance().getTime(); // set  your end time

long duration = endDate.getTime() - startDate.getTime();


long diffInSeconds = TimeUnit.MILLISECONDS.toSeconds(duration);
long diffInMinutes = TimeUnit.MILLISECONDS.toMinutes(duration);
long diffInHours = TimeUnit.MILLISECONDS.toHours(duration);
long diffInDays = TimeUnit.MILLISECONDS.toDays(duration);

Toast.makeText(MainActivity.this, "Diff"
        + duration + diffInDays + diffInHours + diffInMinutes + diffInSeconds, Toast.LENGTH_SHORT).show(); **// Toast message for android .**

System.out.println("Diff" + duration + diffInDays + diffInHours + diffInMinutes + diffInSeconds); **// Print console message for Java .**

Turn a simple socket into an SSL socket

For others like me:

There was once an example in the SSL source in the directory demos/ssl/ with example code in C++. Now it's available only via the history: https://github.com/openssl/openssl/tree/691064c47fd6a7d11189df00a0d1b94d8051cbe0/demos/ssl

You probably will have to find a working version, I originally posted this answer at Nov 6 2015. And I had to edit the source -- not much.

Certificates: .pem in demos/certs/apps/: https://github.com/openssl/openssl/tree/master/demos/certs/apps

Structuring online documentation for a REST API

That's a very complex question for a simple answer.

You may want to take a look at existing API frameworks, like Swagger Specification (OpenAPI), and services like apiary.io and apiblueprint.org.

Also, here's an example of the same REST API described, organized and even styled in three different ways. It may be a good start for you to learn from existing common ways.

At the very top level I think quality REST API docs require at least the following:

  • a list of all your API endpoints (base/relative URLs)
  • corresponding HTTP GET/POST/... method type for each endpoint
  • request/response MIME-type (how to encode params and parse replies)
  • a sample request/response, including HTTP headers
  • type and format specified for all params, including those in the URL, body and headers
  • a brief text description and important notes
  • a short code snippet showing the use of the endpoint in popular web programming languages

Also there are a lot of JSON/XML-based doc frameworks which can parse your API definition or schema and generate a convenient set of docs for you. But the choice for a doc generation system depends on your project, language, development environment and many other things.

Difference between EXISTS and IN in SQL?

If you are using the IN operator, the SQL engine will scan all records fetched from the inner query. On the other hand if we are using EXISTS, the SQL engine will stop the scanning process as soon as it found a match.

Activity restart on rotation Android

Using the Application Class

Depending on what you're doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class.

public class MyApplicationClass extends Application {
  @Override
  public void onCreate() {
    super.onCreate();
    // TODO Put your application initialization code here.
  }
}

The onCreate in the application class is only called when the entire application is created, so the Activity restarts on orientation or keyboard visibility changes won't trigger it.

It's good practice to expose the instance of this class as a singleton and exposing the application variables you're initializing using getters and setters.

NOTE: You'll need to specify the name of your new Application class in the manifest for it to be registered and used:

<application
    android:name="com.you.yourapp.MyApplicationClass"

Reacting to Configuration Changes [UPDATE: this is deprecated since API 13; see the recommended alternative]

As a further alternative, you can have your application listen for events that would cause a restart – like orientation and keyboard visibility changes – and handle them within your Activity.

Start by adding the android:configChanges node to your Activity's manifest node

 <activity android:name=".MyActivity"
      android:configChanges="orientation|keyboardHidden"
      android:label="@string/app_name">

or for Android 3.2 (API level 13) and newer:

<activity android:name=".MyActivity"
      android:configChanges="keyboardHidden|orientation|screenSize"
      android:label="@string/app_name">

Then within the Activity override the onConfigurationChanged method and call setContentView to force the GUI layout to be re-done in the new orientation.

@Override
public void onConfigurationChanged(Configuration newConfig) {
  super.onConfigurationChanged(newConfig);
  setContentView(R.layout.myLayout);
}

How to find out mySQL server ip address from phpmyadmin

The SQL query SHOW VARIABLES WHERE Variable_name = 'hostname' will show you the hostname of the MySQL server which you can easily resolve to its IP address.

SHOW VARIABLES WHERE Variable_name = 'port' Will give you the port number.

You can find details about this in MySQL's manual: 12.4.5.41. SHOW VARIABLES Syntax and 5.1.4. Server System Variables

How to find an available port?

I have recently released a tiny library for doing just that with tests in mind. Maven dependency is:

<dependency>
    <groupId>me.alexpanov</groupId>
    <artifactId>free-port-finder</artifactId>
    <version>1.0</version>
</dependency>

Once installed, free port numbers can be obtained via:

int port = FreePortFinder.findFreeLocalPort();

What are libtool's .la file for?

I found very good explanation about .la files here http://openbooks.sourceforge.net/books/wga/dealing-with-libraries.html

Summary (The way I understood): Because libtool deals with static and dynamic libraries internally (through --diable-shared or --disable-static) it creates a wrapper on the library files it builds. They are treated as binary library files with in libtool supported environment.

How do I handle newlines in JSON?

JSON.stringify

JSON.stringify(`{ 
  a:"a"
}`)

would convert the above string to

"{ \n      a:\"a\"\n    }"

as mentioned here

json stringify

This function adds double quotes at the beginning and end of the input string and escapes special JSON characters. In particular, a newline is replaced by the \n character, a tab is replaced by the \t character, a backslash is replaced by two backslashes \, and a backslash is placed before each quotation mark.

How can I get Android Wifi Scan Results into a list?

Wrap an ArrayAdapter around your List<ScanResult>. Override getView() to populate your rows with the ScanResult data. Here is a free excerpt from one of my books that covers how to create custom ArrayAdapters like this.

How to open html file?

you can use 'urllib' in python3 same as

https://stackoverflow.com/a/27243244/4815313 with few changes.

#python3

import urllib

page = urllib.request.urlopen("/path/").read()
print(page)

How to to send mail using gmail in Laravel?

If you're developing on an XAMPP, then you'll need an SMTP service to send the email. Try using a MailGun account. It's free and easy to use.

Search for a particular string in Oracle clob column

ok, you may use substr in correlation to instr to find the starting position of your string

select 
  dbms_lob.substr(
       product_details, 
       length('NEW.PRODUCT_NO'), --amount
       dbms_lob.instr(product_details,'NEW.PRODUCT_NO') --offset
       ) 
from my_table
where dbms_lob.instr(product_details,'NEW.PRODUCT_NO')>=1;

IntelliJ IDEA generating serialVersionUID

With version v2018.2.1

Go to

Preference > Editor > Inspections > Java > Serialization issues > toggle "Serializable class without 'serialVersionUID'".

A warning should appear next to the class declaration.

Bitwise operation and usage

Bit representations of integers are often used in scientific computing to represent arrays of true-false information because a bitwise operation is much faster than iterating through an array of booleans. (Higher level languages may use the idea of a bit array.)

A nice and fairly simple example of this is the general solution to the game of Nim. Take a look at the Python code on the Wikipedia page. It makes heavy use of bitwise exclusive or, ^.

Convert JSON array to Python list

import json

array = '{"fruits": ["apple", "banana", "orange"]}'
data  = json.loads(array)
print data['fruits']
# the print displays:
# [u'apple', u'banana', u'orange']

You had everything you needed. data will be a dict, and data['fruits'] will be a list

How to keep one variable constant with other one changing with row in excel

There are two kinds of cell reference, and it's really valuable to understand them well.

One is relative reference, which is what you get when you just type the cell: A5. This reference will be adjusted when you paste or fill the formula into other cells.

The other is absolute reference, and you get this by adding dollar signs to the cell reference: $A$5. This cell reference will not change when pasted or filled.

A cool but rarely used feature is that row and column within a single cell reference may be independent: $A5 and A$5. This comes in handy for producing things like multiplication tables from a single formula.

Trying to use INNER JOIN and GROUP BY SQL with SUM Function, Not Working

This should work.

SELECT a.[CUSTOMER ID], a.[NAME], SUM(b.[AMOUNT]) AS [TOTAL AMOUNT]
FROM RES_DATA a INNER JOIN INV_DATA b
ON a.[CUSTOMER ID]=b.[CUSTOMER ID]
GROUP BY a.[CUSTOMER ID], a.[NAME]

I tested it with SQL Fiddle against SQL Server 2008: http://sqlfiddle.com/#!3/1cad5/1

Basically what's happening here is that, because of the join, you are getting the same row on the "left" (i.e. from the RES_DATA table) for every row on the "right" (i.e. the INV_DATA table) that has the same [CUSTOMER ID] value. When you group by just the columns on the left side, and then do a sum of just the [AMOUNT] column from the right side, it keeps the one row intact from the left side, and sums up the matching values from the right side.

How to detect the device orientation using CSS media queries?

@media all and (orientation:portrait) {
/* Style adjustments for portrait mode goes here */
}

@media all and (orientation:landscape) {
  /* Style adjustments for landscape mode goes here */
}

but it still looks like you have to experiment

bypass invalid SSL certificate in .net core

Came here looking for an answer to the same problem, but I'm using WCF for NET Core. If you're in the same boat, use:

client.ClientCredentials.ServiceCertificate.SslCertificateAuthentication = 
    new X509ServiceCertificateAuthentication()
    {
        CertificateValidationMode = X509CertificateValidationMode.None,
        RevocationMode = X509RevocationMode.NoCheck
    };

How to check for DLL dependency?

On your development machine, you can execute the program and run Sysinternals Process Explorer. In the lower pane, it will show you the loaded DLLs and the current paths to them which is handy for a number of reasons. If you are executing off your deployment package, it would reveal which DLLs are referenced in the wrong path (i.e. weren't packaged correctly).

Currently, our company uses Visual Studio Installer projects to walk the dependency tree and output as loose files the program. In VS2013, this is now an extension: https://visualstudiogallery.msdn.microsoft.com/9abe329c-9bba-44a1-be59-0fbf6151054d. We then package these loose files in a more comprehensive installer but at least that setup project all the dot net dependencies and drops them into the one spot and warns you when things are missing.

Fill remaining vertical space with CSS using display:flex

Here is the codepen demo showing the solution:

Important highlights:

  • all containers from html, body, ... .container, should have the height set to 100%
  • introducing flex to ANY of the flex items will trigger calculation of the items sizes based on flex distribution:
    • if only one cell is set to flex, for example: flex: 1 then this flex item will occupy the remaining of the space
    • if there are more than one with the flex property, the calculation will be more complicated. For example, if the item 1 is set to flex: 1 and the item 2 is se to flex: 2 then the item 2 will take twice more of the remaining space
  • Main Size Property

How to remove \xa0 from string in Python?

After trying several methods, to summarize it, this is how I did it. Following are two ways of avoiding/removing \xa0 characters from parsed HTML string.

Assume we have our raw html as following:

raw_html = '<p>Dear Parent, </p><p><span style="font-size: 1rem;">This is a test message, </span><span style="font-size: 1rem;">kindly ignore it. </span></p><p><span style="font-size: 1rem;">Thanks</span></p>'

So lets try to clean this HTML string:

from bs4 import BeautifulSoup
raw_html = '<p>Dear Parent, </p><p><span style="font-size: 1rem;">This is a test message, </span><span style="font-size: 1rem;">kindly ignore it. </span></p><p><span style="font-size: 1rem;">Thanks</span></p>'
text_string = BeautifulSoup(raw_html, "lxml").text
print text_string
#u'Dear Parent,\xa0This is a test message,\xa0kindly ignore it.\xa0Thanks'

The above code produces these characters \xa0 in the string. To remove them properly, we can use two ways.

Method # 1 (Recommended): The first one is BeautifulSoup's get_text method with strip argument as True So our code becomes:

clean_text = BeautifulSoup(raw_html, "lxml").get_text(strip=True)
print clean_text
# Dear Parent,This is a test message,kindly ignore it.Thanks

Method # 2: The other option is to use python's library unicodedata

import unicodedata
text_string = BeautifulSoup(raw_html, "lxml").text
clean_text = unicodedata.normalize("NFKD",text_string)
print clean_text
# u'Dear Parent,This is a test message,kindly ignore it.Thanks'

I have also detailed these methods on this blog which you may want to refer.

Solving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException

Most of the other answers point to eager loading, but I found another solution.

In my case I had an EF object InventoryItem with a collection of InvActivity child objects.

class InventoryItem {
...
   // EF code first declaration of a cross table relationship
   public virtual List<InvActivity> ItemsActivity { get; set; }

   public GetLatestActivity()
   {
       return ItemActivity?.OrderByDescending(x => x.DateEntered).SingleOrDefault();
   }
...
}

And since I was pulling from the child object collection instead of a context query (with IQueryable), the Include() function was not available to implement eager loading. So instead my solution was to create a context from where I utilized GetLatestActivity() and attach() the returned object:

using (DBContext ctx = new DBContext())
{
    var latestAct = _item.GetLatestActivity();

    // attach the Entity object back to a usable database context
    ctx.InventoryActivity.Attach(latestAct);

    // your code that would make use of the latestAct's lazy loading
    // ie   latestAct.lazyLoadedChild.name = "foo";
}

Thus you aren't stuck with eager loading.

how to pass command line arguments to main method dynamically

go to Run Configuration and in argument tab you can write your argument

How do you do Impersonation in .NET?

Here's my vb.net port of Matt Johnson's answer. I added an enum for the logon types. LOGON32_LOGON_INTERACTIVE was the first enum value that worked for sql server. My connection string was just trusted. No user name / password in the connection string.

  <PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _
  Public Class Impersonation
    Implements IDisposable

    Public Enum LogonTypes
      ''' <summary>
      ''' This logon type is intended for users who will be interactively using the computer, such as a user being logged on  
      ''' by a terminal server, remote shell, or similar process.
      ''' This logon type has the additional expense of caching logon information for disconnected operations; 
      ''' therefore, it is inappropriate for some client/server applications,
      ''' such as a mail server.
      ''' </summary>
      LOGON32_LOGON_INTERACTIVE = 2

      ''' <summary>
      ''' This logon type is intended for high performance servers to authenticate plaintext passwords.
      ''' The LogonUser function does not cache credentials for this logon type.
      ''' </summary>
      LOGON32_LOGON_NETWORK = 3

      ''' <summary>
      ''' This logon type is intended for batch servers, where processes may be executing on behalf of a user without 
      ''' their direct intervention. This type is also for higher performance servers that process many plaintext
      ''' authentication attempts at a time, such as mail or Web servers. 
      ''' The LogonUser function does not cache credentials for this logon type.
      ''' </summary>
      LOGON32_LOGON_BATCH = 4

      ''' <summary>
      ''' Indicates a service-type logon. The account provided must have the service privilege enabled. 
      ''' </summary>
      LOGON32_LOGON_SERVICE = 5

      ''' <summary>
      ''' This logon type is for GINA DLLs that log on users who will be interactively using the computer. 
      ''' This logon type can generate a unique audit record that shows when the workstation was unlocked. 
      ''' </summary>
      LOGON32_LOGON_UNLOCK = 7

      ''' <summary>
      ''' This logon type preserves the name and password in the authentication package, which allows the server to make 
      ''' connections to other network servers while impersonating the client. A server can accept plaintext credentials 
      ''' from a client, call LogonUser, verify that the user can access the system across the network, and still 
      ''' communicate with other servers.
      ''' NOTE: Windows NT:  This value is not supported. 
      ''' </summary>
      LOGON32_LOGON_NETWORK_CLEARTEXT = 8

      ''' <summary>
      ''' This logon type allows the caller to clone its current token and specify new credentials for outbound connections.
      ''' The new logon session has the same local identifier but uses different credentials for other network connections. 
      ''' NOTE: This logon type is supported only by the LOGON32_PROVIDER_WINNT50 logon provider.
      ''' NOTE: Windows NT:  This value is not supported. 
      ''' </summary>
      LOGON32_LOGON_NEW_CREDENTIALS = 9
    End Enum

    <DllImport("advapi32.dll", SetLastError:=True, CharSet:=CharSet.Unicode)> _
    Private Shared Function LogonUser(lpszUsername As [String], lpszDomain As [String], lpszPassword As [String], dwLogonType As Integer, dwLogonProvider As Integer, ByRef phToken As SafeTokenHandle) As Boolean
    End Function

    Public Sub New(Domain As String, UserName As String, Password As String, Optional LogonType As LogonTypes = LogonTypes.LOGON32_LOGON_INTERACTIVE)
      Dim ok = LogonUser(UserName, Domain, Password, LogonType, 0, _SafeTokenHandle)
      If Not ok Then
        Dim errorCode = Marshal.GetLastWin32Error()
        Throw New ApplicationException(String.Format("Could not impersonate the elevated user.  LogonUser returned error code {0}.", errorCode))
      End If

      WindowsImpersonationContext = WindowsIdentity.Impersonate(_SafeTokenHandle.DangerousGetHandle())
    End Sub

    Private ReadOnly _SafeTokenHandle As New SafeTokenHandle
    Private ReadOnly WindowsImpersonationContext As WindowsImpersonationContext

    Public Sub Dispose() Implements System.IDisposable.Dispose
      Me.WindowsImpersonationContext.Dispose()
      Me._SafeTokenHandle.Dispose()
    End Sub

    Public NotInheritable Class SafeTokenHandle
      Inherits SafeHandleZeroOrMinusOneIsInvalid

      <DllImport("kernel32.dll")> _
      <ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)> _
      <SuppressUnmanagedCodeSecurity()> _
      Private Shared Function CloseHandle(handle As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean
      End Function

      Public Sub New()
        MyBase.New(True)
      End Sub

      Protected Overrides Function ReleaseHandle() As Boolean
        Return CloseHandle(handle)
      End Function
    End Class

  End Class

You need to Use with a Using statement to contain some code to run impersonated.

Jenkins vs Travis-CI. Which one would you use for a Open Source project?

I would suggest Travis for Open source project. It's just simple to configure and use.

Simple steps to setup:

  1. Should have GITHUB account and register in Travis CI website using your GITHUB account.
  2. Add .travis.yml file in root of your project. Add Travis as service in your repository settings page.

Now every time you commit into your repository Travis will build your project. You can follow simple steps to get started with Travis CI.

Click a button programmatically

Best implementation depends of what you are attempting to do exactly. Nadeem_MK gives you a valid one. Know you can also:

  1. raise the Button2_Click event using PerformClick() method:

    Private Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
        'do stuff
        Me.Button2.PerformClick()
    End Sub
    
  2. attach the same handler to many buttons:

    Private Sub Button1_Click(sender As Object, e As System.EventArgs) _
        Handles Button1.Click, Button2.Click
        'do stuff
    End Sub
    
  3. call the Button2_Click method using the same arguments than Button1_Click(...) method (IF you need to know which is the sender, for example) :

    Private Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
        'do stuff
         Button2_Click(sender, e)
    End Sub
    

Unit Testing: DateTime.Now

These are all good answers, this is what I did on a different project:

Usage:

Get Today's REAL date Time

var today = SystemTime.Now().Date;

Instead of using DateTime.Now, you need to use SystemTime.Now()... It's not hard change but this solution might not be ideal for all projects.

Time Traveling (Lets go 5 years in the future)

SystemTime.SetDateTime(today.AddYears(5));

Get Our Fake "today" (will be 5 years from 'today')

var fakeToday = SystemTime.Now().Date;

Reset the date

SystemTime.ResetDateTime();

/// <summary>
/// Used for getting DateTime.Now(), time is changeable for unit testing
/// </summary>
public static class SystemTime
{
    /// <summary> Normally this is a pass-through to DateTime.Now, but it can be overridden with SetDateTime( .. ) for testing or debugging.
    /// </summary>
    public static Func<DateTime> Now = () => DateTime.Now;

    /// <summary> Set time to return when SystemTime.Now() is called.
    /// </summary>
    public static void SetDateTime(DateTime dateTimeNow)
    {
        Now = () =>  dateTimeNow;
    }

    /// <summary> Resets SystemTime.Now() to return DateTime.Now.
    /// </summary>
    public static void ResetDateTime()
    {
        Now = () => DateTime.Now;
    }
}

Use Async/Await with Axios in React.js

Two issues jump out:

  1. Your getData never returns anything, so its promise (async functions always return a promise) will resolve with undefined when it resolves

  2. The error message clearly shows you're trying to directly render the promise getData returns, rather than waiting for it to resolve and then rendering the resolution

Addressing #1: getData should return the result of calling json:

async getData(){
   const res = await axios('/data');
   return await res.json();
}

Addressig #2: We'd have to see more of your code, but fundamentally, you can't do

<SomeElement>{getData()}</SomeElement>

...because that doesn't wait for the resolution. You'd need instead to use getData to set state:

this.getData().then(data => this.setState({data}))
              .catch(err => { /*...handle the error...*/});

...and use that state when rendering:

<SomeElement>{this.state.data}</SomeElement>

Update: Now that you've shown us your code, you'd need to do something like this:

class App extends React.Component{
    async getData() {
        const res = await axios('/data');
        return await res.json(); // (Or whatever)
    }
    constructor(...args) {
        super(...args);
        this.state = {data: null};
    }
    componentDidMount() {
        if (!this.state.data) {
            this.getData().then(data => this.setState({data}))
                          .catch(err => { /*...handle the error...*/});
        }
    }
    render() {
        return (
            <div>
                {this.state.data ? <em>Loading...</em> : this.state.data}
            </div>
        );
    }
}

Futher update: You've indicated a preference for using await in componentDidMount rather than then and catch. You'd do that by nesting an async IIFE function within it and ensuring that function can't throw. (componentDidMount itself can't be async, nothing will consume that promise.) E.g.:

class App extends React.Component{
    async getData() {
        const res = await axios('/data');
        return await res.json(); // (Or whatever)
    }
    constructor(...args) {
        super(...args);
        this.state = {data: null};
    }
    componentDidMount() {
        if (!this.state.data) {
            (async () => {
                try {
                    this.setState({data: await this.getData()});
                } catch (e) {
                    //...handle the error...
                }
            })();
        }
    }
    render() {
        return (
            <div>
                {this.state.data ? <em>Loading...</em> : this.state.data}
            </div>
        );
    }
}

Simple PHP calculator

<?php
$cal1= $_GET['cal1'];
$cal2= $_GET['cal2'];
$symbol =$_GET['symbol'];


if($symbol == '+')
{
    $add = $cal1 + $cal2;
    echo "Addition is:".$add;
}

else if($symbol == '-')
{
    $subs = $cal1 - $cal2;
    echo "Substraction is:".$subs;
}

 else if($symbol == '*')
{
    $mul = $cal1 * $cal2;
    echo "Multiply is:".$mul;
}

else if($symbol == '/')
{
    $div = $cal1 / $cal2;
    echo "Division is:".$div;
}

  else
{

    echo "Oops ,something wrong in your code son";
}


?>

SQL distinct for 2 fields in a database

How about simply:

select distinct c1, c2 from t

or

select c1, c2, count(*)
from t
group by c1, c2

How to check if AlarmManager already has an alarm set?

Following up on the comment ron posted, here is the detailed solution. Let's say you have registered a repeating alarm with a pending intent like this:

Intent intent = new Intent("com.my.package.MY_UNIQUE_ACTION");
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, 
                                      intent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.MINUTE, 1);

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60, pendingIntent);

The way you would check to see if it is active is to:

boolean alarmUp = (PendingIntent.getBroadcast(context, 0, 
        new Intent("com.my.package.MY_UNIQUE_ACTION"), 
        PendingIntent.FLAG_NO_CREATE) != null);

if (alarmUp)
{
    Log.d("myTag", "Alarm is already active");
}

The key here is the FLAG_NO_CREATE which as described in the javadoc: if the described PendingIntent **does not** already exists, then simply return null (instead of creating a new one)

How do I script a "yes" response for installing programs?

echo y | command should work.

Also, some installers have an "auto-yes" flag. It's -y for apt-get on Ubuntu.

Bootstrap col-md-offset-* not working

If you are ok with small tweak - we know that bootstrap works with a width of 12

<div class="row">
      <div class="col-md-1">
            Keep it blank it becomes left offset
      </div> 
      <div class="col-md-5">
      </div>
      <div class="col-md-5">
      </div>
      <div class="col-md-1">
            Keep it blank it becomes right offset
      </div
</div>

I am sure there is a better way to do this, but i was in a hurry so used this trick

Creating a LinkedList class from scratch

class Node
{
  int data;
     Node link;

     public Node()
     {
         data=0;
         link=null;
        }

     Node ptr,start,temp;

    void create()throws  IOException
     {
         int n;
         BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
         System.out.println("Enter first data");
         this.data=Integer.parseInt(br.readLine());
         ptr=this;
         start=ptr;
         char ins ='y';
         do
         {
             System.out.println("Wanna Insert another node???");
             ins=(char)br.read();
             br.read();
             if(ins=='y')
             {
                 temp=new Node();
                 System.out.println("Enter next data");
                 temp.data=Integer.parseInt(br.readLine());
                 temp.link=null;
                 ptr.link=temp;
                 temp=null;
                 ptr=ptr.link;
                }
            }while(ins=='y');
        }

public static void main(String args[])throws IOException
     {
       Node first= new Node();
       first.create();
}
}

How can you float: right in React Native?

<View style={{ flex: 1, flexDirection: 'row', justifyContent: 'flex-end' }}>
  <Text>
  Some Text
  </Text>
</View>

flexDirection: If you want to move horizontally (row) or vertically (column)

justifyContent: the direction you want to move.

Using curl to upload POST data with files

After a lot of tries this command worked for me:

curl -v -F filename=image.jpg -F [email protected] http://localhost:8080/api/upload

How do you run a js file using npm scripts?

You should use npm run-script build or npm build <project_folder>. More info here: https://docs.npmjs.com/cli/build.

jQuery fade out then fade in

With async functions and promises, it now can work as simply as this:

async function foobar() {
  await $("#example").fadeOut().promise();
  doSomethingElse();
  await $("#example").fadeIn().promise();
}

Android background music service

I have found two great resources to share, if anyone else come across this thread via Google, this may help them ( 2018 ). One is this video tutorial in which you'll see practically how service works, this is good for starters.

Link :- https://www.youtube.com/watch?v=p2ffzsCqrs8

Other is this website which will really help you with background audio player.

Link :- https://www.dev2qa.com/android-play-audio-file-in-background-service-example/

Good Luck :)

Best way to encode Degree Celsius symbol into web page?

I'm not sure why this hasn't come up yet but why don't you use &#8451; (?) or &#8457; (?) for Celsius and Fahrenheit respectively!

Swipe to Delete and the "More" button (like in Mail app on iOS 7)

Swift 4 & iOs 11+

@available(iOS 11.0, *)
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {

    let delete = UIContextualAction(style: .destructive, title: "Delete") { _, _, handler in

        handler(true)
        // handle deletion here
    }

    let more = UIContextualAction(style: .normal, title: "More") { _, _, handler in

        handler(true)
        // handle more here
    }

    return UISwipeActionsConfiguration(actions: [delete, more])
}

Postgres integer arrays as parameters?

Full Coding Structure

postgresql function

CREATE OR REPLACE FUNCTION admin.usp_itemdisplayid_byitemhead_select(
    item_head_list int[])
    RETURNS TABLE(item_display_id integer) 
    LANGUAGE 'sql'

    COST 100
    VOLATILE 
    ROWS 1000
    
AS $BODY$ 
        SELECT vii.item_display_id from admin.view_item_information as vii
where vii.item_head_id = ANY(item_head_list);
    $BODY$;

Model

public class CampaignCreator
    {
        public int item_display_id { get; set; }
        public List<int> pitem_head_id { get; set; }
    }

.NET CORE function

DynamicParameters _parameter = new DynamicParameters();
                _parameter.Add("@item_head_list",obj.pitem_head_id);
                
                string sql = "select * from admin.usp_itemdisplayid_byitemhead_select(@item_head_list)";
                response.data = await _connection.QueryAsync<CampaignCreator>(sql, _parameter);

Select n random rows from SQL Server table

In MySQL you can do this:

SELECT `PRIMARY_KEY`, rand() FROM table ORDER BY rand() LIMIT 5000;

Find p-value (significance) in scikit-learn LinearRegression

EDIT: Probably not the right way to do it, see comments

You could use sklearn.feature_selection.f_regression.

click here for the scikit-learn page

image.onload event and browser cache

There are two possible solutions for these kind of situations:

  1. Use the solution suggested on this post
  2. Add a unique suffix to the image src to force browser downloading it again, like this:

    var img = new Image();
    img.src = "img.jpg?_="+(new Date().getTime());
    img.onload = function () {
        alert("image is loaded");
    }
    

In this code every time adding current timestamp to the end of the image URL you make it unique and browser will download the image again

Getting text from td cells with jQuery

$(".field-group_name").each(function() {
        console.log($(this).text());
    });

Store multiple values in single key in json

Use arrays:

{
    "number": ["1", "2", "3"],
    "alphabet": ["a", "b", "c"]
}

You can the access the different values from their position in the array. Counting starts at left of array at 0. myJsonObject["number"][0] == 1 or myJsonObject["alphabet"][2] == 'c'

Learning Regular Expressions

The most important part is the concepts. Once you understand how the building blocks work, differences in syntax amount to little more than mild dialects. A layer on top of your regular expression engine's syntax is the syntax of the programming language you're using. Languages such as Perl remove most of this complication, but you'll have to keep in mind other considerations if you're using regular expressions in a C program.

If you think of regular expressions as building blocks that you can mix and match as you please, it helps you learn how to write and debug your own patterns but also how to understand patterns written by others.

Start simple

Conceptually, the simplest regular expressions are literal characters. The pattern N matches the character 'N'.

Regular expressions next to each other match sequences. For example, the pattern Nick matches the sequence 'N' followed by 'i' followed by 'c' followed by 'k'.

If you've ever used grep on Unix—even if only to search for ordinary looking strings—you've already been using regular expressions! (The re in grep refers to regular expressions.)

Order from the menu

Adding just a little complexity, you can match either 'Nick' or 'nick' with the pattern [Nn]ick. The part in square brackets is a character class, which means it matches exactly one of the enclosed characters. You can also use ranges in character classes, so [a-c] matches either 'a' or 'b' or 'c'.

The pattern . is special: rather than matching a literal dot only, it matches any character. It's the same conceptually as the really big character class [-.?+%$A-Za-z0-9...].

Think of character classes as menus: pick just one.

Helpful shortcuts

Using . can save you lots of typing, and there are other shortcuts for common patterns. Say you want to match a digit: one way to write that is [0-9]. Digits are a frequent match target, so you could instead use the shortcut \d. Others are \s (whitespace) and \w (word characters: alphanumerics or underscore).

The uppercased variants are their complements, so \S matches any non-whitespace character, for example.

Once is not enough

From there, you can repeat parts of your pattern with quantifiers. For example, the pattern ab?c matches 'abc' or 'ac' because the ? quantifier makes the subpattern it modifies optional. Other quantifiers are

  • * (zero or more times)
  • + (one or more times)
  • {n} (exactly n times)
  • {n,} (at least n times)
  • {n,m} (at least n times but no more than m times)

Putting some of these blocks together, the pattern [Nn]*ick matches all of

  • ick
  • Nick
  • nick
  • Nnick
  • nNick
  • nnick
  • (and so on)

The first match demonstrates an important lesson: * always succeeds! Any pattern can match zero times.

A few other useful examples:

  • [0-9]+ (and its equivalent \d+) matches any non-negative integer
  • \d{4}-\d{2}-\d{2} matches dates formatted like 2019-01-01

Grouping

A quantifier modifies the pattern to its immediate left. You might expect 0abc+0 to match '0abc0', '0abcabc0', and so forth, but the pattern immediately to the left of the plus quantifier is c. This means 0abc+0 matches '0abc0', '0abcc0', '0abccc0', and so on.

To match one or more sequences of 'abc' with zeros on the ends, use 0(abc)+0. The parentheses denote a subpattern that can be quantified as a unit. It's also common for regular expression engines to save or "capture" the portion of the input text that matches a parenthesized group. Extracting bits this way is much more flexible and less error-prone than counting indices and substr.

Alternation

Earlier, we saw one way to match either 'Nick' or 'nick'. Another is with alternation as in Nick|nick. Remember that alternation includes everything to its left and everything to its right. Use grouping parentheses to limit the scope of |, e.g., (Nick|nick).

For another example, you could equivalently write [a-c] as a|b|c, but this is likely to be suboptimal because many implementations assume alternatives will have lengths greater than 1.

Escaping

Although some characters match themselves, others have special meanings. The pattern \d+ doesn't match backslash followed by lowercase D followed by a plus sign: to get that, we'd use \\d\+. A backslash removes the special meaning from the following character.

Greediness

Regular expression quantifiers are greedy. This means they match as much text as they possibly can while allowing the entire pattern to match successfully.

For example, say the input is

"Hello," she said, "How are you?"

You might expect ".+" to match only 'Hello,' and will then be surprised when you see that it matched from 'Hello' all the way through 'you?'.

To switch from greedy to what you might think of as cautious, add an extra ? to the quantifier. Now you understand how \((.+?)\), the example from your question works. It matches the sequence of a literal left-parenthesis, followed by one or more characters, and terminated by a right-parenthesis.

If your input is '(123) (456)', then the first capture will be '123'. Non-greedy quantifiers want to allow the rest of the pattern to start matching as soon as possible.

(As to your confusion, I don't know of any regular-expression dialect where ((.+?)) would do the same thing. I suspect something got lost in transmission somewhere along the way.)

Anchors

Use the special pattern ^ to match only at the beginning of your input and $ to match only at the end. Making "bookends" with your patterns where you say, "I know what's at the front and back, but give me everything between" is a useful technique.

Say you want to match comments of the form

-- This is a comment --

you'd write ^--\s+(.+)\s+--$.

Build your own

Regular expressions are recursive, so now that you understand these basic rules, you can combine them however you like.

Tools for writing and debugging regexes:

Books

Free resources

Footnote

†: The statement above that . matches any character is a simplification for pedagogical purposes that is not strictly true. Dot matches any character except newline, "\n", but in practice you rarely expect a pattern such as .+ to cross a newline boundary. Perl regexes have a /s switch and Java Pattern.DOTALL, for example, to make . match any character at all. For languages that don't have such a feature, you can use something like [\s\S] to match "any whitespace or any non-whitespace", in other words anything.

How to force Laravel Project to use HTTPS for all routes?

Here are several ways. Choose most convenient.

  1. Configure your web server to redirect all non-secure requests to https. Example of a nginx config:

    server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name example.com www.example.com;
        return 301 https://example.com$request_uri;
    }
    
  2. Set your environment variable APP_URL using https:

    APP_URL=https://example.com
    
  3. Use helper secure_url() (Laravel5.6)

  4. Add following string to AppServiceProvider::boot() method (for version 5.4+):

    \Illuminate\Support\Facades\URL::forceScheme('https');
    

Update:

  1. Implicitly setting scheme for route group (Laravel5.6):

    Route::group(['scheme' => 'https'], function () {
        // Route::get(...)->name(...);
    });
    

Asp Net Web API 2.1 get client IP address

My solution is similar to user1587439's answer, but works directly on the controller's instance (instead of accessing HttpContext.Current).

In the 'Watch' window, I saw that this.RequestContext.WebRequest contains the 'UserHostAddress' property, but since it relies on the WebHostHttpRequestContext type (which is internal to the 'System.Web.Http' assembly) - I wasn't able to access it directly, so I used reflection to directly access it:

string hostAddress = ((System.Web.HttpRequestWrapper)this.RequestContext.GetType().Assembly.GetType("System.Web.Http.WebHost.WebHostHttpRequestContext").GetProperty("WebRequest").GetMethod.Invoke(this.RequestContext, null)).UserHostAddress;

I'm not saying it's the best solution. using reflection may cause issues in the future in case of framework upgrade (due to name changes), but for my needs it's perfect

What is the main purpose of setTag() getTag() methods of View?

Unlike IDs, tags are not used to identify views. Tags are essentially an extra piece of information that can be associated with a view. They are most often used as a convenience to store data related to views in the views themselves rather than by putting them in a separate structure.

Reference: http://developer.android.com/reference/android/view/View.html

Example of Mockito's argumentCaptor

I agree with what @fge said, more over. Lets look at example. Consider you have a method:

class A {
    public void foo(OtherClass other) {
        SomeData data = new SomeData("Some inner data");
        other.doSomething(data);
    }
}

Now if you want to check the inner data you can use the captor:

// Create a mock of the OtherClass
OtherClass other = mock(OtherClass.class);

// Run the foo method with the mock
new A().foo(other);

// Capture the argument of the doSomething function
ArgumentCaptor<SomeData> captor = ArgumentCaptor.forClass(SomeData.class);
verify(other, times(1)).doSomething(captor.capture());

// Assert the argument
SomeData actual = captor.getValue();
assertEquals("Some inner data", actual.innerData);

How to add new elements to an array?

The size of an array can't be modified. If you want a bigger array you have to instantiate a new one.

A better solution would be to use an ArrayList which can grow as you need it. The method ArrayList.toArray( T[] a ) gives you back your array if you need it in this form.

List<String> where = new ArrayList<String>();
where.add( ContactsContract.Contacts.HAS_PHONE_NUMBER+"=1" );
where.add( ContactsContract.Contacts.IN_VISIBLE_GROUP+"=1" );

If you need to convert it to a simple array...

String[] simpleArray = new String[ where.size() ];
where.toArray( simpleArray );

But most things you do with an array you can do with this ArrayList, too:

// iterate over the array
for( String oneItem : where ) {
    ...
}

// get specific items
where.get( 1 );

Formatting PowerShell Get-Date inside string

You can use the -f operator

$a = "{0:D}" -f (get-date)
$a = "{0:dddd}" -f (get-date)

Spécificator    Type                                Example (with [datetime]::now)
d   Short date                                        26/09/2002
D   Long date                                       jeudi 26 septembre 2002
t   Short Hour                                      16:49
T   Long Hour                                       16:49:31
f   Date and hour                                   jeudi 26 septembre 2002 16:50
F   Long Date and hour                              jeudi 26 septembre 2002 16:50:51
g   Default Date                                    26/09/2002 16:52
G   Long default Date and hour                      26/09/2009 16:52:12
M   Month Symbol                                    26 septembre
r   Date string RFC1123                             Sat, 26 Sep 2009 16:54:50 GMT
s   Sortable string date                            2009-09-26T16:55:58
u   Sortable string date universal local hour       2009-09-26 16:56:49Z
U   Sortable string date universal GMT hour         samedi 26 septembre 2009 14:57:22 (oups)
Y   Year symbol                                     septembre 2002

Spécificator    Type                       Example      Output Example
dd              Jour                       {0:dd}       10
ddd             Name of the day            {0:ddd}      Jeu.
dddd            Complet name of the day    {0:dddd}     Jeudi
f, ff, …        Fractions of seconds       {0:fff}      932
gg, …           position                   {0:gg}       ap. J.-C.
hh              Hour two digits            {0:hh}       10
HH              Hour two digits (24 hours) {0:HH}       22
mm              Minuts 00-59               {0:mm}       38
MM              Month 01-12                {0:MM}       12
MMM             Month shortcut             {0:MMM}      Sep.
MMMM            complet name of the month  {0:MMMM}     Septembre
ss              Seconds 00-59              {0:ss}       46
tt              AM or PM                   {0:tt}       ““
yy              Years, 2 digits            {0:yy}       02
yyyy            Years                      {0:yyyy}     2002
zz              Time zone, 2 digits        {0:zz}       +02
zzz             Complete Time zone         {0:zzz}      +02:00
:               Separator                  {0:hh:mm:ss}     10:43:20
/               Separator                  {0:dd/MM/yyyy}   10/12/2002

How to keep form values after post

If you are looking to just repopulate the fields with the values that were posted in them, then just echo the post value back into the field, like so:

<input type="text" name="myField1" value="<?php echo isset($_POST['myField1']) ? $_POST['myField1'] : '' ?>" />

Uninitialized Constant MessagesController

Your model is @Messages, change it to @message.

To change it like you should use migration:

def change   rename_table :old_table_name, :new_table_name end 

Of course do not create that file by hand but use rails generator:

rails g migration ChangeMessagesToMessage 

That will generate new file with proper timestamp in name in 'db dir. Then run:

rake db:migrate 

And your app should be fine since then.

Fill username and password using selenium in python

I am new to selenium and I tried all solutions above but they don't work. Finally, I tried this manually by

driver = webdriver.Firefox()
import time

driver.get(url)

time.sleep(20)

print (driver.page_source.encode("utf-8"))

Then I could get contents from web.

docker run <IMAGE> <MULTIPLE COMMANDS>

If you want to store the result in one file outside the container, in your local machine, you can do something like this.

RES_FILE=$(readlink -f /tmp/result.txt)

docker run --rm -v ${RES_FILE}:/result.txt img bash -c "cat /etc/passwd | grep root > /result.txt"

The result of your commands will be available in /tmp/result.txt in your local machine.

How to resize Twitter Bootstrap modal dynamically based on the content

Simple Css work for me

.modal-dialog { 
max-width : 100% ;
}

Why a function checking if a string is empty always returns true?

PHP have a built in function called empty() the test is done by typing if(empty($string)){...} Reference php.net : php empty

Child with max-height: 100% overflows parent

A good solution is to not use height on the parent and use it just on the child with View Port :

Fiddle Example: https://jsfiddle.net/voan3v13/1/

body, html {
  width: 100%;
  height: 100%;
}
.parent {
  width: 400px;
  background: green;
}

.child {
  max-height: 40vh;
  background: blue;
  overflow-y: scroll;
}

setContentView(R.layout.main); error

Simply:

  1. Right click on your project.

  2. Go to properties.

  3. Select android (second option in the Left panel).

  4. Click "add..." (in library), select your project.

  5. Click ok.

  6. And finally, clean your project.

If this doesn't work, make sure that "android-support-v7-appcompat" is in your Project Explorer.

If it isn't there, you can add it by importing a simple project from: C:/android-sdks\extras\android\support\v7\appcompat

Add CSS class to a div in code behind

Button1.CssClass += " newClass";

This will not erase your original classes for that control. Try this, it should work.

Get all files modified in last 30 days in a directory

A couple of issues

  • You're not limiting it to files, so when it finds a matching directory it will list every file within it.
  • You can't use > in -exec without something like bash -c '... > ...'. Though the > will overwrite the file, so you want to redirect the entire find anyway rather than each -exec.
  • +30 is older than 30 days, -30 would be modified in last 30 days.
  • -exec really isn't needed, you could list everything with various -printf options.

Something like below should work

find . -type f -mtime -30 -exec ls -l {} \; > last30days.txt

Example with -printf

find . -type f -mtime -30 -printf "%M %u %g %TR %TD %p\n" > last30days.txt

This will list files in format "permissions owner group time date filename". -printf is generally preferable to -exec in cases where you don't have to do anything complicated. This is because it will run faster as a result of not having to execute subshells for each -exec. Depending on the version of find, you may also be able to use -ls, which has a similar format to above.

Angular 6 Material mat-select change method removed

If you're using Reactive forms you can listen for changes to the select control like so..

this.form.get('mySelectControl').valueChanges.subscribe(value => { ... do stuff ... })

What algorithms compute directions from point A to point B on a map?

This question has been an active area of research in the last years. The main idea is to do a preprocessing on the graph once, to speed up all following queries. With this additional information itineraries can be computed very fast. Still, Dijkstra's Algorithm is the basis for all optimisations.

Arachnid described the usage of bidirectional search and edge pruning based on hierarchical information. These speedup techniques work quite well, but the most recent algorithms outperform these techniques by all means. With current algorithms a shortest paths can be computed in considerable less time than one millisecond on a continental road network. A fast implementation of the unmodified algorithm of Dijkstra needs about 10 seconds.

The article Engineering Fast Route Planning Algorithms gives an overview of the progress of research in that field. See the references of that paper for further information.

The fastest known algorithms do not use information about the hierarchical status of the road in the data, i.e. if it is a highway or a local road. Instead, they compute in a preprocessing step an own hierarchy that optimised to speed up route planning. This precomputation can then be used to prune the search: Far away from start and destination slow roads need not be considered during Dijkstra's Algorithm. The benefits are very good performance and a correctness guarantee for the result.

The first optimised route planning algorithms dealt only with static road networks, that means an edge in the graph has a fixed cost value. This not true in practice, since we want to take dynamic information like traffic jams or vehicle dependent restrictrions into account. Latest algorithms can also deal with such issues, but there are still problems to solve and the research is going on.

If you need the shortest path distances to compute a solution for the TSP, then you are probably interested in matrices that contain all distances between your sources and destinations. For this you could consider Computing Many-to-Many Shortest Paths Using Highway Hierarchies. Note, that this has been improved by newer approaches in the last 2 years.

AltGr key not working, instead I have to use Ctrl+AltGr

I found a solution for my problem while writing my question !

Going into my remote session i tried two key combinations, and it solved the problem on my Desktop : Alt+Enter and Ctrl+Enter (i don't know which one solved the problem though)

I tried to reproduce the problem, but i couldn't... but i'm almost sure it's one of the key combinations described in the question above (since i experienced this problem several times)

So it seems the problem comes from the use of RDP (windows7 and 8)

Update 2017: Problem occurs on Windows 10 aswell.

Convert Java Date to UTC String

Following the useful comments, I've completely rebuilt the date formatter. Usage is supposed to:

  • Be short (one liner)
  • Represent disposable objects (time zone, format) as Strings
  • Support useful, sortable ISO formats and the legacy format from the box

If you consider this code useful, I may publish the source and a JAR in github.

Usage

// The problem - not UTC
Date.toString()                      
"Tue Jul 03 14:54:24 IDT 2012"

// ISO format, now
PrettyDate.now()        
"2012-07-03T11:54:24.256 UTC"

// ISO format, specific date
PrettyDate.toString(new Date())         
"2012-07-03T11:54:24.256 UTC"

// Legacy format, specific date
PrettyDate.toLegacyString(new Date())   
"Tue Jul 03 11:54:24 UTC 2012"

// ISO, specific date and time zone
PrettyDate.toString(moonLandingDate, "yyyy-MM-dd hh:mm:ss zzz", "CST") 
"1969-07-20 03:17:40 CDT"

// Specific format and date
PrettyDate.toString(moonLandingDate, "yyyy-MM-dd")
"1969-07-20"

// ISO, specific date
PrettyDate.toString(moonLandingDate)
"1969-07-20T20:17:40.234 UTC"

// Legacy, specific date
PrettyDate.toLegacyString(moonLandingDate)
"Wed Jul 20 08:17:40 UTC 1969"

Code

(This code is also the subject of a question on Code Review stackexchange)

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

/**
 * Formats dates to sortable UTC strings in compliance with ISO-8601.
 * 
 * @author Adam Matan <[email protected]>
 * @see http://stackoverflow.com/questions/11294307/convert-java-date-to-utc-string/11294308
 */
public class PrettyDate {
    public static String ISO_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS zzz";
    public static String LEGACY_FORMAT = "EEE MMM dd hh:mm:ss zzz yyyy";
    private static final TimeZone utc = TimeZone.getTimeZone("UTC");
    private static final SimpleDateFormat legacyFormatter = new SimpleDateFormat(LEGACY_FORMAT);
    private static final SimpleDateFormat isoFormatter = new SimpleDateFormat(ISO_FORMAT);
    static {
        legacyFormatter.setTimeZone(utc);
        isoFormatter.setTimeZone(utc);
    }

    /**
     * Formats the current time in a sortable ISO-8601 UTC format.
     * 
     * @return Current time in ISO-8601 format, e.g. :
     *         "2012-07-03T07:59:09.206 UTC"
     */
    public static String now() {
        return PrettyDate.toString(new Date());
    }

    /**
     * Formats a given date in a sortable ISO-8601 UTC format.
     * 
     * <pre>
     * <code>
     * final Calendar moonLandingCalendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
     * moonLandingCalendar.set(1969, 7, 20, 20, 18, 0);
     * final Date moonLandingDate = moonLandingCalendar.getTime();
     * System.out.println("UTCDate.toString moon:       " + PrettyDate.toString(moonLandingDate));
     * >>> UTCDate.toString moon:       1969-08-20T20:18:00.209 UTC
     * </code>
     * </pre>
     * 
     * @param date
     *            Valid Date object.
     * @return The given date in ISO-8601 format.
     * 
     */

    public static String toString(final Date date) {
        return isoFormatter.format(date);
    }

    /**
     * Formats a given date in the standard Java Date.toString(), using UTC
     * instead of locale time zone.
     * 
     * <pre>
     * <code>
     * System.out.println(UTCDate.toLegacyString(new Date()));
     * >>> "Tue Jul 03 07:33:57 UTC 2012"
     * </code>
     * </pre>
     * 
     * @param date
     *            Valid Date object.
     * @return The given date in Legacy Date.toString() format, e.g.
     *         "Tue Jul 03 09:34:17 IDT 2012"
     */
    public static String toLegacyString(final Date date) {
        return legacyFormatter.format(date);
    }

    /**
     * Formats a date in any given format at UTC.
     * 
     * <pre>
     * <code>
     * final Calendar moonLandingCalendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
     * moonLandingCalendar.set(1969, 7, 20, 20, 17, 40);
     * final Date moonLandingDate = moonLandingCalendar.getTime();
     * PrettyDate.toString(moonLandingDate, "yyyy-MM-dd")
     * >>> "1969-08-20"
     * </code>
     * </pre>
     * 
     * 
     * @param date
     *            Valid Date object.
     * @param format
     *            String representation of the format, e.g. "yyyy-MM-dd"
     * @return The given date formatted in the given format.
     */
    public static String toString(final Date date, final String format) {
        return toString(date, format, "UTC");
    }

    /**
     * Formats a date at any given format String, at any given Timezone String.
     * 
     * 
     * @param date
     *            Valid Date object
     * @param format
     *            String representation of the format, e.g. "yyyy-MM-dd HH:mm"
     * @param timezone
     *            String representation of the time zone, e.g. "CST"
     * @return The formatted date in the given time zone.
     */
    public static String toString(final Date date, final String format, final String timezone) {
        final TimeZone tz = TimeZone.getTimeZone(timezone);
        final SimpleDateFormat formatter = new SimpleDateFormat(format);
        formatter.setTimeZone(tz);
        return formatter.format(date);
    }
}

How do you install Boost on MacOS?

Install Xcode from the mac app store. Then use the command:

  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

the above will install homebrew and allow you to use brew in terminal

then just use command :

brew install boost

which would then install the boost libraries to <your macusername>/usr/local/Cellar/boost

Determine project root from a running node.js application

There are several ways to approach this, each with their own pros and cons:

require.main.filename

From http://nodejs.org/api/modules.html:

When a file is run directly from Node, require.main is set to its module. That means that you can determine whether a file has been run directly by testing require.main === module

Because module provides a filename property (normally equivalent to __filename), the entry point of the current application can be obtained by checking require.main.filename.

So if you want the base directory for your app, you can do:

var path = require('path');
var appDir = path.dirname(require.main.filename);

Pros & Cons

This will work great most of the time, but if you're running your app with a launcher like pm2 or running mocha tests, this method will fail.

global.X

Node has a a global namespace object called global — anything that you attach to this object will be available everywhere in your app. So, in your index.js (or app.js or whatever your main app file is named), you can just define a global variable:

// index.js
var path = require('path');
global.appRoot = path.resolve(__dirname);

// lib/moduleA/component1.js
require(appRoot + '/lib/moduleB/component2.js');

Pros & Cons

Works consistently but you have to rely on a global variable, which means that you can't easily reuse components/etc.

process.cwd()

This returns the current working directory. Not reliable at all, as it's entirely dependent on what directory the process was launched from:

$ cd /home/demo/
$ mkdir subdir
$ echo "console.log(process.cwd());" > subdir/demo.js
$ node subdir/demo.js
/home/demo
$ cd subdir
$ node demo.js
/home/demo/subdir

app-root-path

To address this issue, I've created a node module called app-root-path. Usage is simple:

var appRoot = require('app-root-path');
var myModule = require(appRoot + '/lib/my-module.js');

The app-root-path module uses several different techniques to determine the root path of the app, taking into account globally installed modules (for example, if your app is running in /var/www/ but the module is installed in ~/.nvm/v0.x.x/lib/node/). It won't work 100% of the time, but it's going to work in most common scenarios.

Pros & Cons

Works without configuration in most circumstances. Also provides some nice additional convenience methods (see project page). The biggest con is that it won't work if:

  • You're using a launcher, like pm2
  • AND, the module isn't installed inside your app's node_modules directory (for example, if you installed it globally)

You can get around this by either setting a APP_ROOT_PATH environmental variable, or by calling .setPath() on the module, but in that case, you're probably better off using the global method.

NODE_PATH environmental variable

If you're looking for a way to determine the root path of the current app, one of the above solutions is likely to work best for you. If, on the other hand, you're trying to solve the problem of loading app modules reliably, I highly recommend looking into the NODE_PATH environmental variable.

Node's Modules system looks for modules in a variety of locations. One of these locations is wherever process.env.NODE_PATH points. If you set this environmental variable, then you can require modules with the standard module loader without any other changes.

For example, if you set NODE_PATH to /var/www/lib, the the following would work just fine:

require('module2/component.js');
// ^ looks for /var/www/lib/module2/component.js

A great way to do this is using npm:

"scripts": {
    "start": "NODE_PATH=. node app.js"
}

Now you can start your app with npm start and you're golden. I combine this with my enforce-node-path module, which prevents accidentally loading the app without NODE_PATH set. For even more control over enforcing environmental variables, see checkenv.

One gotcha: NODE_PATH must be set outside of the node app. You cannot do something like process.env.NODE_PATH = path.resolve(__dirname) because the module loader caches the list of directories it will search before your app runs.

[added 4/6/16] Another really promising module that attempts to solve this problem is wavy.

Explicit vs implicit SQL joins

On some databases (notably Oracle) the order of the joins can make a huge difference to query performance (if there are more than two tables). On one application, we had literally two orders of magnitude difference in some cases. Using the inner join syntax gives you control over this - if you use the right hints syntax.

You didn't specify which database you're using, but probability suggests SQL Server or MySQL where there it makes no real difference.

Second line in li starts under the bullet after CSS-reset

I second Dipaks' answer, but often just the text-indent is enough as you may/maynot be positioning the ul for better layout control.

ul li{
text-indent: -1em;
}

Post values from a multiple select

try this : here select is your select element

let select = document.getElementsByClassName('lstSelected')[0],
    options = select.options,
    len = options.length,
    data='',
    i=0;
while (i<len){
    if (options[i].selected)
        data+= "&" + select.name + '=' + options[i].value;
    i++;
}
return data;

Data is in the form of query string i.e.name=value&name=anotherValue

How to generate components in a specific folder with Angular CLI?

To open a terminal in VS code just type CTRL + ~ which will open the terminal. Here are the steps:

  1. Check for the particular component where you need to generate the new component.

  2. Redirect the path to the particular folder/component where you need to generate another component

FOR EXAMPLE: cd src/app/particularComponent

In the place of particularComponent, type the component name in which you need to generate the new component.

  1. Once you are in the component where you need to generate the new component, just type this command: ng g c NewComponentName

(Change the name NewComponentName to your required component name.)

Padding between ActionBar's home icon and title

I used this method setContentInsetsAbsolute(int contentInsetLeft, int contentInsetRight) and it works!

int padding = getResources().getDimensionPixelSize(R.dimen.toolbar_content_insets);
mToolbar.setContentInsetsAbsolute(padding, 0);

What are the undocumented features and limitations of the Windows FINDSTR command?

Answer continued from part 1 above - I've run into the 30,000 character answer limit :-(

Limited Regular Expressions (regex) Support
FINDSTR support for regular expressions is extremely limited. If it is not in the HELP documentation, it is not supported.

Beyond that, the regex expressions that are supported are implemented in a completely non-standard manner, such that results can be different then would be expected coming from something like grep or perl.

Regex Line Position anchors ^ and $
^ matches beginning of input stream as well as any position immediately following a <LF>. Since FINDSTR also breaks lines after <LF>, a simple regex of "^" will always match all lines within a file, even a binary file.

$ matches any position immediately preceding a <CR>. This means that a regex search string containing $ will never match any lines within a Unix style text file, nor will it match the last line of a Windows text file if it is missing the EOL marker of <CR><LF>.

Note - As previously discussed, piped and redirected input to FINDSTR may have <CR><LF> appended that is not in the source. Obviously this can impact a regex search that uses $.

Any search string with characters before ^ or after $ will always fail to find a match.

Positional Options /B /E /X
The positional options work the same as ^ and $, except they also work for literal search strings.

/B functions the same as ^ at the start of a regex search string.

/E functions the same as $ at the end of a regex search string.

/X functions the same as having both ^ at the beginning and $ at the end of a regex search string.

Regex word boundary
\< must be the very first term in the regex. The regex will not match anything if any other characters precede it. \< corresponds to either the very beginning of the input, the beginning of a line (the position immediately following a <LF>), or the position immediately following any "non-word" character. The next character need not be a "word" character.

\> must be the very last term in the regex. The regex will not match anything if any other characters follow it. \> corresponds to either the end of input, the position immediately prior to a <CR>, or the position immediately preceding any "non-word" character. The preceding character need not be a "word" character.

Here is a complete list of "non-word" characters, represented as the decimal byte code. Note - this list was compiled on a U.S machine. I do not know what impact other languages may have on this list.

001   028   063   179   204   230
002   029   064   180   205   231
003   030   091   181   206   232
004   031   092   182   207   233
005   032   093   183   208   234
006   033   094   184   209   235
007   034   096   185   210   236
008   035   123   186   211   237
009   036   124   187   212   238
011   037   125   188   213   239
012   038   126   189   214   240
014   039   127   190   215   241
015   040   155   191   216   242
016   041   156   192   217   243
017   042   157   193   218   244
018   043   158   194   219   245
019   044   168   195   220   246
020   045   169   196   221   247
021   046   170   197   222   248
022   047   173   198   223   249
023   058   174   199   224   250
024   059   175   200   226   251
025   060   176   201   227   254
026   061   177   202   228   255
027   062   178   203   229

Regex character class ranges [x-y]
Character class ranges do not work as expected. See this question: Why does findstr not handle case properly (in some circumstances)?, along with this answer: https://stackoverflow.com/a/8767815/1012053.

The problem is FINDSTR does not collate the characters by their byte code value (commonly thought of as the ASCII code, but ASCII is only defined from 0x00 - 0x7F). Most regex implementations would treat [A-Z] as all upper case English capital letters. But FINDSTR uses a collation sequence that roughly corresponds to how SORT works. So [A-Z] includes the complete English alphabet, both upper and lower case (except for "a"), as well as non-English alpha characters with diacriticals.

Below is a complete list of all characters supported by FINDSTR, sorted in the collation sequence used by FINDSTR to establish regex character class ranges. The characters are represented as their decimal byte code value. I believe the collation sequence makes the most sense if the characters are viewed using code page 437. Note - this list was compiled on a U.S machine. I do not know what impact other languages may have on this list.

001
002
003
004
005
006
007
008
014
015
016
017
018           
019
020
021
022
023
024
025
026
027
028
029
030
031
127
039
045
032
255
009
010
011
012
013
033
034
035
036
037
038
040
041
042
044
046
047
058
059
063
064
091
092
093
094
095
096
123
124
125
126
173
168
155
156
157
158
043
249
060
061
062
241
174
175
246
251
239
247
240
243
242
169
244
245
254
196
205
179
186
218
213
214
201
191
184
183
187
192
212
211
200
217
190
189
188
195
198
199
204
180
181
182
185
194
209
210
203
193
207
208
202
197
216
215
206
223
220
221
222
219
176
177
178
170
248
230
250
048
172
171
049
050
253
051
052
053
054
055
056
057
236
097
065
166
160
133
131
132
142
134
143
145
146
098
066
099
067
135
128
100
068
101
069
130
144
138
136
137
102
070
159
103
071
104
072
105
073
161
141
140
139
106
074
107
075
108
076
109
077
110
252
078
164
165
111
079
167
162
149
147
148
153
112
080
113
081
114
082
115
083
225
116
084
117
085
163
151
150
129
154
118
086
119
087
120
088
121
089
152
122
090
224
226
235
238
233
227
229
228
231
237
232
234

Regex character class term limit and BUG
Not only is FINDSTR limited to a maximum of 15 character class terms within a regex, it fails to properly handle an attempt to exceed the limit. Using 16 or more character class terms results in an interactive Windows pop up stating "Find String (QGREP) Utility has encountered a problem and needs to close. We are sorry for the inconvenience." The message text varies slightly depending on the Windows version. Here is one example of a FINDSTR that will fail:

echo 01234567890123456|findstr [0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]

This bug was reported by DosTips user Judago here. It has been confirmed on XP, Vista, and Windows 7.

Regex searches fail (and may hang indefinitely) if they include byte code 0xFF (decimal 255)
Any regex search that includes byte code 0xFF (decimal 255) will fail. It fails if byte code 0xFF is included directly, or if it is implicitly included within a character class range. Remember that FINDSTR character class ranges do not collate characters based on the byte code value. Character <0xFF> appears relatively early in the collation sequence between the <space> and <tab> characters. So any character class range that includes both <space> and <tab> will fail.

The exact behavior changes slightly depending on the Windows version. Windows 7 hangs indefinitely if 0xFF is included. XP doesn't hang, but it always fails to find a match, and occasionally prints the following error message - "The process tried to write to a nonexistent pipe."

I no longer have access to a Vista machine, so I haven't been able to test on Vista.

Regex bug: . and [^anySet] can match End-Of-File
The regex . meta-character should only match any character other than <CR> or <LF>. There is a bug that allows it to match the End-Of-File if the last line in the file is not terminated by <CR> or <LF>. However, the . will not match an empty file.

For example, a file named "test.txt" containing a single line of x, without terminating <CR> or <LF>, will match the following:

findstr /r x......... test.txt

This bug has been confirmed on XP and Win7.

The same seems to be true for negative character sets. Something like [^abc] will match End-Of-File. Positive character sets like [abc] seem to work fine. I have only tested this on Win7.