I ran into the same problem. I fixed by right click on the package -> properties -> Java Build Path -> Add folder (select the folder your code reside in).

You can do it like this:

class UsersController < ApplicationController
  ## Exception Handling
  class NotActivated < StandardError
  end

  rescue_from NotActivated, :with => :not_activated

  def not_activated(exception)
    flash[:notice] = "This user is not activated."
    Event.new_event "Exception: #{exception.message}", current_user, request.remote_ip
    redirect_to "/"
  end

  def show
      // Do something that fails..
      raise NotActivated unless @user.is_activated?
  end
end

What you're doing here is creating a class "NotActivated" that will serve as Exception. Using raise, you can throw "NotActivated" as an Exception. rescue_from is the way of catching an Exception with a specified method (not_activated in this case). Quite a long example, but it should show you how it works.

Best wishes,
Fabian

I managed to make it possible to dynamically add a column using just a line of code like this:

MyItemsCollection.AddPropertyDescriptor(
    new DynamicPropertyDescriptor<User, int>("Age", x => x.Age));

Regarding to the question, this is not a XAML-based solution (since as mentioned there is no reasonable way to do it), neither it is a solution which would operate directly with DataGrid.Columns. It actually operates with DataGrid bound ItemsSource, which implements ITypedList and as such provides custom methods for PropertyDescriptor retrieval. In one place in code you can define "data rows" and "data columns" for your grid.

If you would have:

IList<string> ColumnNames { get; set; }
//dict.key is column name, dict.value is value
Dictionary<string, string> Rows { get; set; }

you could use for example:

var descriptors= new List<PropertyDescriptor>();
//retrieve column name from preprepared list or retrieve from one of the items in dictionary
foreach(var columnName in ColumnNames)
    descriptors.Add(new DynamicPropertyDescriptor<Dictionary, string>(ColumnName, x => x[columnName]))
MyItemsCollection = new DynamicDataGridSource(Rows, descriptors) 

and your grid using binding to MyItemsCollection would be populated with corresponding columns. Those columns can be modified (new added or existing removed) at runtime dynamically and grid will automatically refresh it's columns collection.

DynamicPropertyDescriptor mentioned above is just an upgrade to regular PropertyDescriptor and provides strongly-typed columns definition with some additional options. DynamicDataGridSource would otherwise work just fine event with basic PropertyDescriptor.

For powershell in Windows, you can add relative path + filename to --output flag:

curl -L  http://github.com/GorvGoyl/Notion-Boost-browser-extension/archive/master.zip --output build_firefox/master-repo.zip

here build_firefox is relative folder.

submit is not a function

means that you named your submit button or some other element submit. Rename the button to btnSubmit and your call will magically work.

When you name the button submit, you override the submit() function on the form.

Use jQuery multiple-selector if the only difference between the two functions is the value of the button being triggered.

$("#button_1, #button_2").on("click", function(e) {
    e.preventDefault();
    $.ajax({type: "POST",
        url: "/pages/test/",
        data: { id: $(this).val(), access_token: $("#access_token").val() },
        success:function(result) {
          alert('ok');
        },
        error:function(result) {
          alert('error');
        }
    });
});

A simple switch statement should do the trick:

function abc() {
    var elem=document.getElementById('test'),color;
    switch(elem.style.color) {
        case('red'):
            color='black';
            break;
        case('black'):
        default:
            color='red';
    }
    elem.style.color=color;
}

If you have Underscore.js installed, you could:

$(window).resize(_.debounce(function(){
    alert("Resized");
},500));

A peculiar difference I have noted on gcc 5.2.1 and clang 3.6.2 is that if you have a critical loop like:

for (;;) {
    if (!visited) {
        ....
    }
    node++;
    if (!*node) break;
  }

Then gcc will, when compiling with -O3 or -O2, speculatively unroll the loop eight times. Clang will not unroll it at all. Through trial and error I found that in my specific case with my program data, the right amount of unrolling is five so gcc overshot and clang undershot. However, overshooting was more detrimental to performance, so gcc performed much worse here.

I have no idea if the unrolling difference is a general trend or just something that was specific to my scenario.

A while back I wrote a few garbage collectors to teach myself more about performance optimization in C. And the results I got is in my mind enough to slightly favor clang. Especially since garbage collection is mostly about pointer chasing and copying memory.

The results are (numbers in seconds):

+---------------------+-----+-----+
|Type                 |GCC  |Clang|
+---------------------+-----+-----+
|Copying GC           |22.46|22.55|
|Copying GC, optimized|22.01|20.22|
|Mark & Sweep         | 8.72| 8.38|
|Ref Counting/Cycles  |15.14|14.49|
|Ref Counting/Plain   | 9.94| 9.32|
+---------------------+-----+-----+

This is all pure C code, and I make no claim about either compiler's performance when compiling C++ code.

On Ubuntu 15.10, x86.64, and an AMD Phenom(tm) II X6 1090T processor.

You appear to have a heredoc containing a single SQL*Plus command, though it doesn't look right as noted in the comments. You can either pass a value in the heredoc:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql BUILDING
exit;
EOF

or if BUILDING is $2 in your script:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql $2
exit;
EOF

If your file.sql had an exit at the end then it would be even simpler as you wouldn't need the heredoc:

sqlplus -S user/pass@localhost @/opt/D2RQ/file.sql $2

In your SQL you can then refer to the position parameters using substitution variables:

...
}',SEM_Models('&1'),NULL,
...

The &1 will be replaced with the first value passed to the SQL script, BUILDING; because that is a string it still needs to be enclosed in quotes. You might want to set verify off to stop if showing you the substitutions in the output.

You can pass multiple values, and refer to them sequentially just as you would positional parameters in a shell script - the first passed parameter is &1, the second is &2, etc. You can use substitution variables anywhere in the SQL script, so they can be used as column aliases with no problem - you just have to be careful adding an extra parameter that you either add it to the end of the list (which makes the numbering out of order in the script, potentially) or adjust everything to match:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql total_count BUILDING
exit;
EOF

or:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql total_count $2
exit;
EOF

If total_count is being passed to your shell script then just use its positional parameter, $4 or whatever. And your SQL would then be:

SELECT COUNT(*) as &1
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&2'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

If you pass a lot of values you may find it clearer to use the positional parameters to define named parameters, so any ordering issues are all dealt with at the start of the script, where they are easier to maintain:

define MY_ALIAS = &1
define MY_MODEL = &2

SELECT COUNT(*) as &MY_ALIAS
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&MY_MODEL'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

From your separate question, maybe you just wanted:

SELECT COUNT(*) as &1
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&1'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

... so the alias will be the same value you're querying on (the value in $2, or BUILDING in the original part of the answer). You can refer to a substitution variable as many times as you want.

That might not be easy to use if you're running it multiple times, as it will appear as a header above the count value in each bit of output. Maybe this would be more parsable later:

select '&1' as QUERIED_VALUE, COUNT(*) as TOTAL_COUNT

If you set pages 0 and set heading off, your repeated calls might appear in a neat list. You might also need to set tab off and possibly use rpad('&1', 20) or similar to make that column always the same width. Or get the results as CSV with:

select '&1' ||','|| COUNT(*)

Depends what you're using the results for...

Unicode and encodings are completely different, unrelated things.

Unicode

Assigns a numeric ID to each character:

• 0x41 ? A
• 0xE1 ? á
• 0x414 ? ?

So, Unicode assigns the number 0x41 to A, 0xE1 to á, and 0x414 to ?.

Even the little arrow ? I used has its Unicode number, it's 0x2192. And even emojis have their Unicode numbers, is 0x1F602.

You can look up the Unicode numbers of all characters in this table. In particular, you can find the first three characters above here, the arrow here, and the emoji here.

These numbers assigned to all characters by Unicode are called code points.

The purpose of all this is to provide a means to unambiguously refer to a each character. For example, if I'm talking about , instead of saying "you know, this laughing emoji with tears", I can just say, Unicode code point 0x1F602. Easier, right?

Note that Unicode code points are usually formatted with a leading U+, then the hexadecimal numeric value padded to at least 4 digits. So, the above examples would be U+0041, U+00E1, U+0414, U+2192, U+1F602.

Unicode code points range from U+0000 to U+10FFFF. That is 1,114,112 numbers. 2048 of these numbers are used for surrogates, thus, there remain 1,112,064. This means, Unicode can assign a unique ID (code point) to 1,112,064 distinct characters. Not all of these code points are assigned to a character yet, and Unicode is extended continuously (for example, when new emojis are introduced).

The important thing to remember is that all Unicode does is to assign a numerical ID, called code point, to each character for easy and unambiguous reference.

Encodings

Map characters to bit patterns.

These bit patterns are used to represent the characters in computer memory or on disk.

There are many different encodings that cover different subsets of characters. In the English-speaking world, the most common encodings are the following:

ASCII

Maps 128 characters (code points U+0000 to U+007F) to bit patterns of length 7.

Example:

• a ? 1100001 (0x61)

You can see all the mappings in this table.

ISO 8859-1 (aka Latin-1)

Maps 191 characters (code points U+0020 to U+007E and U+00A0 to U+00FF) to bit patterns of length 8.

Example:

• a ? 01100001 (0x61)
• á ? 11100001 (0xE1)

You can see all the mappings in this table.

UTF-8

Maps 1,112,064 characters (all existing Unicode code points) to bit patterns of either length 8, 16, 24, or 32 bits (that is, 1, 2, 3, or 4 bytes).

Example:

• a ? 01100001 (0x61)
• á ? 11000011 10100001 (0xC3 0xA1)
• ? ? 11100010 10001001 10100000 (0xE2 0x89 0xA0)
• ? 11110000 10011111 10011000 10000010 (0xF0 0x9F 0x98 0x82)

The way UTF-8 encodes characters to bit strings is very well described here.

Unicode and Encodings

Looking at the above examples, it becomes clear how Unicode is useful.

For example, if I'm Latin-1 and I want to explain my encoding of á, I don't need to say:

"I encode that a with an aigu (or however you call that rising bar) as 11100001"

But I can just say:

"I encode U+00E1 as 11100001"

And if I'm UTF-8, I can say:

"Me, in turn, I encode U+00E1 as 11000011 10100001"

And it's unambiguously clear to everybody which character we mean.

Now to the often arising confusion

It's true that sometimes the bit pattern of an encoding, if you interpret it as a binary number, is the same as the Unicode code point of this character.

For example:

• ASCII encodes a as 1100001, which you can interpret as the hexadecimal number 0x61, and the Unicode code point of a is U+0061.
• Latin-1 encodes á as 11100001, which you can interpret as the hexadecimal number 0xE1, and the Unicode code point of á is U+00E1.

Of course, this has been arranged like this on purpose for convenience. But you should look at it as a pure coincidence. The bit pattern used to represent a character in memory is not tied in any way to the Unicode code point of this character.

Nobody even says that you have to interpret a bit string like 11100001 as a binary number. Just look at it as the sequence of bits that Latin-1 uses to encode the character á.

Back to your question

The encoding used by your Python interpreter is UTF-8.

Here's what's going on in your examples:

Example 1

The following encodes the character á in UTF-8. This results in the bit string 11000011 10100001, which is saved in the variable a.

>>> a = 'á'

When you look at the value of a, its content 11000011 10100001 is formatted as the hex number 0xC3 0xA1 and output as '\xc3\xa1':

>>> a
'\xc3\xa1'

Example 2

The following saves the Unicode code point of á, which is U+00E1, in the variable ua (we don't know which data format Python uses internally to represent the code point U+00E1 in memory, and it's unimportant to us):

>>> ua = u'á'

When you look at the value of ua, Python tells you that it contains the code point U+00E1:

>>> ua
u'\xe1'

Example 3

The following encodes Unicode code point U+00E1 (representing character á) with UTF-8, which results in the bit pattern 11000011 10100001. Again, for output this bit pattern is represented as the hex number 0xC3 0xA1:

>>> ua.encode('utf-8')
'\xc3\xa1'

Example 4

The following encodes Unicode code point U+00E1 (representing character á) with Latin-1, which results in the bit pattern 11100001. For output, this bit pattern is represented as the hex number 0xE1, which by coincidence is the same as the initial code point U+00E1:

>>> ua.encode('latin1')
'\xe1'

There's no relation between the Unicode object ua and the Latin-1 encoding. That the code point of á is U+00E1 and the Latin-1 encoding of á is 0xE1 (if you interpret the bit pattern of the encoding as a binary number) is a pure coincidence.

all can not work using above methods.

javascript:

function resizer(id) {
        var doc = document.getElementById(id).contentWindow.document;
        var body_ = doc.body, html_ = doc.documentElement;

        var height = Math.max(body_.scrollHeight, body_.offsetHeight, html_.clientHeight, html_.scrollHeight, html_.offsetHeight);
        var width = Math.max(body_.scrollWidth, body_.offsetWidth, html_.clientWidth, html_.scrollWidth, html_.offsetWidth);

        document.getElementById(id).style.height = height;
        document.getElementById(id).style.width = width;

    }

html:

<div style="background-color:#b6ff00;min-height:768px;line-height:inherit;height:inherit;margin:0px;padding:0px;overflow:visible" id="mainDiv"  >
         <input id="txtHeight"/>height     <input id="txtWidth"/>width     
        <iframe src="head.html" name="topFrame" scrolling="No" noresize="noresize" id="topFrame" title="topFrame" style="width:100%; height: 47px" frameborder="0"  ></iframe>
        <iframe src="left.aspx" name="leftFrame" scrolling="yes"   id="Iframe1" title="leftFrame" onload="resizer('Iframe1');" style="top:0px;left:0px;right:0px;bottom:0px;width: 30%; border:none;border-spacing:0px; justify-content:space-around;" ></iframe>
        <iframe src="index.aspx" name="mainFrame" id="Iframe2" title="mainFrame" scrolling="yes" marginheight="0" frameborder="0" style="width: 65%; height:100%; overflow:visible;overflow-x:visible;overflow-y:visible; "  onload="resizer('Iframe2');" ></iframe>
</div>

Env: IE 10, Windows 7 x64

TL;DR
event.preventDefault()
Prevents the browsers default behaviour (such as opening a link), but does not stop the event from bubbling up the DOM.

event.stopPropagation()
Prevents the event from bubbling up the DOM, but does not stop the browsers default behaviour.

return false;
Usually seen in jQuery code, it Prevents the browsers default behaviour, Prevents the event from bubbling up the DOM, and immediately Returns from any callback.

One should checkout this really nice & easy 4 min read with examples from where the above piece was copied from.

Related answer, but if you want to run clean up a user inputting values into a form, here's what you can do:

const numFormatter = new Intl.NumberFormat('en-US', {
  style: "decimal",
  maximumFractionDigits: 2
})

// Good Inputs
parseFloat(numFormatter.format('1234').replace(/,/g,"")) // 1234
parseFloat(numFormatter.format('123').replace(/,/g,"")) // 123

// 3rd decimal place rounds to nearest
parseFloat(numFormatter.format('1234.233').replace(/,/g,"")); // 1234.23
parseFloat(numFormatter.format('1234.239').replace(/,/g,"")); // 1234.24

// Bad Inputs
parseFloat(numFormatter.format('1234.233a').replace(/,/g,"")); // NaN
parseFloat(numFormatter.format('$1234.23').replace(/,/g,"")); // NaN

// Edge Cases
parseFloat(numFormatter.format(true).replace(/,/g,"")) // 1
parseFloat(numFormatter.format(false).replace(/,/g,"")) // 0
parseFloat(numFormatter.format(NaN).replace(/,/g,"")) // NaN

Use the international date local via format. This cleans up any bad inputs, if there is one it returns a string of NaN you can check for. There's no way currently of removing commas as part of the locale (as of 10/12/19), so you can use a regex command to remove commas using replace.

ParseFloat converts the this type definition from string to number

If you use React, this is what your calculate function could look like:

updateCalculationInput = (e) => {
    let value;
    value = numFormatter.format(e.target.value); // 123,456.78 - 3rd decimal rounds to nearest number as expected
    if(value === 'NaN') return; // locale returns string of NaN if fail
    value = value.replace(/,/g, ""); // remove commas
    value = parseFloat(value); // now parse to float should always be clean input

    // Do the actual math and setState calls here
}

Thanks a lot, it works like this:

java -Djava.rmi.server.hostname=xxx.xxx.xxx.xxx -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=25000 -jar myjar.jar

Some of the "getResourceAsStream()" options in this answer didn't work for me, but this one did:

SomeClassWithinYourSourceDir.class.getClassLoader().getResourceAsStream("yourResource");

You can't. There's no self in the class body, because no instance exists. You'd need to pass it, say, a str containing the attribute name to lookup on the instance, which the returned function can then do, or use a different method entirely.

public MainPage()
{
    this.InitializeComponent();
    ...
    ...
    ...
    //Make Start result text copiable
    TextBlockStatusStart.IsTextSelectionEnabled = true;
}

One cannot simply overestimate this post and answers thx OP and helpers. My solution with just video_id exchanging:

<div style="pointer-events: none;">
    <iframe id="myVideo" src="https://www.youtube.com/embed/video_id?rel=0&modestbranding=1&fs=0&controls=0&autoplay=1&showinfo=0&version=3&enablejsapi=1" width="560" height="315" frameborder="0"></iframe> </div>

    <button id="play">PLAY</button>

    <button id="pause">PAUSE</button>


    <script>
        $('#play').click(function() {
            $('#myVideo').each(function(){ 
                var frame = document.getElementById("myVideo");
                frame.contentWindow.postMessage(
                    '{"event":"command","func":"playVideo","args":""}', 
                    '*'); 
            });
        });

        $('#pause').click(function() {
            $('#myVideo').each(function(){ 
                var frame = document.getElementById("myVideo");
                frame.contentWindow.postMessage(
                  '{"event":"command","func":"pauseVideo","args":""}',
                  '*'); 
            });
        });
    </script>

From Linux kernel (GPLv2):

/*
 * Divide positive or negative dividend by positive divisor and round
 * to closest integer. Result is undefined for negative divisors and
 * for negative dividends if the divisor variable type is unsigned.
 */
#define DIV_ROUND_CLOSEST(x, divisor)(          \
{                           \
    typeof(x) __x = x;              \
    typeof(divisor) __d = divisor;          \
    (((typeof(x))-1) > 0 ||             \
     ((typeof(divisor))-1) > 0 || (__x) > 0) ?  \
        (((__x) + ((__d) / 2)) / (__d)) :   \
        (((__x) - ((__d) / 2)) / (__d));    \
}                           \
)

Two options:

<button>multiline<br/>button<br/>text</button>

or

 <input type="button" value="Carriage&#13;&#10;return&#13;&#10;separators" style="text-align:center;">

I would have rather commented but I don't have a high enough rep.

As far as I am aware, for positive arguments and a divisor which is a power of 2, this is the fastest way (tested in CUDA):

//example y=8
q = (x >> 3) + !!(x & 7);

For generic positive arguments only, I tend to do it like so:

q = x/y + !!(x % y);

For example, like this:

const querystring = require('querystring');
const https = require('https');

var postData = querystring.stringify({
    'msg' : 'Hello World!'
});

var options = {
  hostname: 'posttestserver.com',
  port: 443,
  path: '/post.php',
  method: 'POST',
  headers: {
       'Content-Type': 'application/x-www-form-urlencoded',
       'Content-Length': postData.length
     }
};

var req = https.request(options, (res) => {
  console.log('statusCode:', res.statusCode);
  console.log('headers:', res.headers);

  res.on('data', (d) => {
    process.stdout.write(d);
  });
});

req.on('error', (e) => {
  console.error(e);
});

req.write(postData);
req.end();

There are a few things you can try to get this working.

1. Be ABSOLUTELY sure your script is being pulled into the page, one way to check is by using the 'sources' tab in the Chrome Debugger and searching for the file.

2. Be sure that you've included the script after you've included jQuery, as it is most certainly dependant upon that.

Other than that, I checked out the API and you're definitely doing everything right as far as I can see. Best of luck friend!

EDIT: Ensure you close your script tag. There's an answer below that points to that being the solution.

Turns out that the problem was with face that the script was running from a cPanel "email piped to script", so was running as the user, so is was a user problem, but was not affecting the web server at all.

The cause for the user not being able to access the /etc/pki directory was due to them only having jailed ssh access. Once I granted full access, it all worked fine.

Thanks for the info though, Remi.

I found this nice write-up that clears it up pretty nicely:

The different graphic assets we request are used to highlight and promote your application in Android Market, and possibly other Google-owned properties. If you’d like to restrict the marketing of your app to just Android Market, you have the option of opting-out of marketing by selecting the "Marketing Opt-Out" in the Developer Console.

Screenshots (Required):
We require 2 screenshots.
Use: Displayed on the details page for your application in Android Market.
You may upload up to 8 screenshots.
Specs: 320w x 480h, 480w x 800h, or 480w x 854h; 24 bit PNG or JPEG (no alpha) Full bleed, no border in art.
Tips:
Landscape thumbnails are cropped, but we preserve the image’s full size and aspect ratio if the user opens it up on market client.
High Resolution Application Icon (Required):
Use: In various locations in Android Market.
Does not replace your launcher icon.
Specs: 512x512, 32-bit PNG with alpha; Max size of 1024KB.
Tips:
This does not replace your launcher icon, but should be a higher-fidelity, higher-resolution version of your application icon.
Same safe-frame as current launcher guidelines, just scaled up:
Full Asset: 512 x 512 px.
Circle or non-square icons: 426 x 426 px, centered within the PNG.
Square Icons: 398 x 398 px.
Drop shadow: black, 75% opaque, 90 degrees down, distance of 14px, size of 36px.
Tweak as necessary to fit icon style (e.g., Google Maps icon has a drop shadow of varying height).
Promotional Graphic (Optional):
Use: In various locations in Android Market.
Specs: 180w x 120h, 24 bit PNG or JPEG (no alpha), Full bleed, no border in art.
Feature Graphic (Optional):
Use: The featured section in Android Market. Will be downsized to mini or micro.
Specs: 1024w x 500h, 24 bit PNG or JPEG (no alpha) with no transparency
Tips:
Use a safe frame of 924x400 (50 pixel of safe padding on each side). All the important content of the graphic should be within this safe frame. Pixels outside of this safe frame may be cropped for stylistic purposes.
If incorporating text, use large font sizes, and keep the graphic simple, as this graphic may be scaled down from its original size.
This graphic may be displayed alone without the app icon.
Video Link (Optional):
Specs: Enter the URL to a YouTube video showcasing your app.
Tip:
Short videos (30 seconds - 2 minutes) highlighting the top features of your app work best.

You can write a try - catch block around the line you want to have ignored.

Like in the example code of yours. If you just continue your code below the closing bracket of the catch block everythings fine.

querySelectorAll with standard class selectors also works for this.

document.querySelectorAll('.class1.class2');

I faced a similar issue during work with Ubuntu 16.04 by using Docker. In my case that was a problem with Composer, but error message (and thus the problem) was the same.

Because of minimalist Docker-oriented base image I had missing ca-certificates package and simple apt-get install ca-certificates helped me.

This maybe what you're looking for:

awk 'BEGIN {FS=" ";} {printf "'\''%s'\'' ", $1}'

That is, with '\'' you close the opening ', then print a literal ' by escaping it and finally open the ' again.

Amit-

I don't believe you can add a column anywhere but at the end of the table once the table is created. One solution might be to try this:

CREATE TABLE MY_TEMP_TABLE AS
SELECT *
FROM TABLE_TO_CHANGE;

Drop the table you want to add columns to:

DROP TABLE TABLE_TO_CHANGE;

It's at the point you could rebuild the existing table from scratch adding in the columns where you wish. Let's assume for this exercise you want to add the columns named "COL2 and COL3".

Now insert the data back into the new table:

INSERT INTO TABLE_TO_CHANGE (COL1, COL2, COL3, COL4) 
SELECT COL1, 'Foo', 'Bar', COL4
FROM MY_TEMP_TABLE;

When the data is inserted into your "new-old" table, you can drop the temp table.

DROP TABLE MY_TEMP_TABLE;

This is often what I do when I want to add columns in a specific location. Obviously if this is a production on-line system, then it's probably not practical, but just one potential idea.

-CJ

Of course, you may write a recursive algorithm in Batch that gives you exact control of what you do in every nested subdirectory:

@echo off
set mypath=
call :treeProcess
goto :eof

:treeProcess
setlocal
for %%f in (*.txt) do echo %mypath%%%f
for /D %%d in (*) do (
    set mypath=%mypath%%%d\
    cd %%d
    call :treeProcess
    cd ..
)
endlocal
exit /b

To execute your command directly from within C#, you would use the SqlCommand class.

Quick sample code using paramaterized SQL (to avoid injection attacks) might look like this:

string queryString = "SELECT tPatCulIntPatIDPk, tPatSFirstname, tPatSName, tPatDBirthday  FROM  [dbo].[TPatientRaw] WHERE tPatSName = @tPatSName";
string connectionString = "Server=.\PDATA_SQLEXPRESS;Database=;User Id=sa;Password=2BeChanged!;";

using (SqlConnection connection = new SqlConnection(connectionString))
{
    SqlCommand command = new SqlCommand(queryString, connection);
    command.Parameters.AddWithValue("@tPatSName", "Your-Parm-Value");
    connection.Open();
    SqlDataReader reader = command.ExecuteReader();
    try
    {
        while (reader.Read())
        {
            Console.WriteLine(String.Format("{0}, {1}",
            reader["tPatCulIntPatIDPk"], reader["tPatSFirstname"]));// etc
        }
    }
    finally
    {
        // Always call Close when done reading.
        reader.Close();
    }
}

I recommend using http://jsbeautifier.org/ - if you paste your code snippet into it and press beautify, the error is immediately visible.

Must it be an Eclipse plug-in? I use doxygen, just supply your code folder, it handles the rest.

One way is to use a Boolean series to index the column df['one']. This gives you a new column where the True entries have the same value as the same row as df['one'] and the False values are NaN.

The Boolean series is just given by your if statement (although it is necessary to use & instead of and):

>>> df['que'] = df['one'][(df['one'] >= df['two']) & (df['one'] <= df['three'])]
>>> df
    one two three   que
0   10  1.2 4.2      10
1   15  70  0.03    NaN
2   8   5   0       NaN

If you want the NaN values to be replaced by other values, you can use the fillna method on the new column que. I've used 0 instead of the empty string here:

>>> df['que'] = df['que'].fillna(0)
>>> df
    one two three   que
0   10  1.2   4.2    10
1   15   70  0.03     0
2    8    5     0     0

No, you still need to scp [from] [to] whichever way you're copying

The difference is, you need to scp -p server:serverpath localpath

You need a table variable and it can be this simple.

declare @ID table (ID int)

insert into MyTable2(ID)
output inserted.ID into @ID
values (1)

Sometimes, patience is key.

I had the same problem with a java project with big node_modules / .m2 directories.
The indexing was very long so I paused it and it prevented me from using Run Configurations.

So I waited for the indexing to finish and only then I was able to run my main class.

[self.navigationController.view addSubview:overlayView]; is what you really want

If you use performSelectorInBackground:withObject: to spawn a new thread, then the performed selector is responsible for setting up the new thread's autorelease pool, run loop and other configuration details – see "Using NSObject to Spawn a Thread" in Apple's Threading Programming Guide.

You'd probably be better off using Grand Central Dispatch, though:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    [self getResultSetFromDB:docids];
});

GCD is a newer technology, and is more efficient in terms of memory overhead and lines of code.

Updated with a hat tip to Chris Nolet, who suggested a change that makes the above code simpler and keeps up with Apple's latest GCD code examples.

Let's say I have code in the directory ~/local_dir/myNewApp, and I want to put it under 'https://svn.host/existing_path/myNewApp' (while being able to ignore some binaries, vendor libraries, etc.).

1. Create an empty folder in the repository svn mkdir https://svn.host/existing_path/myNewApp
2. Go to the parent directory of the project, cd ~/local_dir
3. Check out the empty directory over your local folder. Don't be afraid - the files you have locally will not be deleted. svn co https://svn.host/existing_path/myNewApp. If your folder has a different name locally than in the repository, you must specify it as an additional argument.
4. You can see that svn st will now show all your files as ?, which means that they are not currently under revision control
5. Perform svn add on files you want to add to the repository, and add others to svn:ignore. You may find some useful options with svn help add, for example --parents or --depth empty, when you want selectively add only some files/folders.
6. Commit with svn ci

Could be that using the numeral code is more universal, as it's a direct reference to a character in the html entity table, but I guess they both work everywhere. The first notation is just massively easier to remember for a lot of characters.

.span7.btn { display: block;   margin-left: auto;   margin-right: auto; }

I am not completely familiar with bootstrap, but something like the above should do the trick. It may not be necessary to include all of the classes. This should center the button within its parent, the span7.

If you set a different field separator, you can directly use a for loop:

IFS=","
for v in $variable
do
   # things with "$v" ...
done

You can also store the values in an array and then loop through it as indicated in How do I split a string on a delimiter in Bash?:

IFS=, read -ra values <<< "$variable"
for v in "${values[@]}"
do
   # things with "$v"
done

Test

$ variable="abc,def,ghij"
$ IFS=","
$ for v in $variable
> do
> echo "var is $v"
> done
var is abc
var is def
var is ghij

You can find a broader approach in this solution to How to iterate through a comma-separated list and execute a command for each entry.

Examples on the second approach:

$ IFS=, read -ra vals <<< "abc,def,ghij"
$ printf "%s\n" "${vals[@]}"
abc
def
ghij
$ for v in "${vals[@]}"; do echo "$v --"; done
abc --
def --
ghij --

I've experienced "internal errors" in the .NET runtime that turned out to be caused by bugs in my code; don't think that just because it was an "internal error" in the .NET runtime that there isn't a bug in your code as the root cause. Always always always blame your own code before you blame someone else's.

Hopefully you have logging and exception/stack trace information to point you where to start looking, or that you can repeat the state of the system before the crash.

There are a couple generic types in .Net (v2 and later) that make passing functions around as delegates very easy.

For functions with return types, there is Func<> and for functions without return types there is Action<>.

Both Func and Action can be declared to take from 0 to 4 parameters. For example, Func < double, int > takes one double as a parameter and returns an int. Action < double, double, double > takes three doubles as parameters and returns nothing (void).

So you can declare your Diff function to take a Func:

public double Diff(double x, Func<double, double> f) {
    double h = 0.0000001;

    return (f(x + h) - f(x)) / h;
}

And then you call it as so, simply giving it the name of the function that fits the signature of your Func or Action:

double result = Diff(myValue, Function);

You can even write the function in-line with lambda syntax:

double result = Diff(myValue, d => Math.Sqrt(d * 3.14));

var startDate = "06/27/2007";
startDate = new Date(startDate);

console.log(startDate);

From past experience, I'd have to go for DIV's. Even in OOP, the main aim is to reduce the coupling between objects, so this concept can be applied to DIVS and tables. Tables are used for holding data, not for arranging it around a page. A DIV is specifically designed to arrange items around a page, so the design should use DIV's, tables should be used to store data.

Also, editting websites made with tables is just plain hard (in my opinion)

Normally you can use None, but you can also use objc.NULL, e.g.

import objc
val = objc.NULL

Especially useful when working with C code in Python.

Also see: Python objc.NULL Examples

You can create a function:

function changeInputType(oldObj, oTyp, nValue) {
  var newObject = document.createElement('input');
  newObject.type = oTyp;
  if(oldObj.size) newObject.size = oldObj.size;
  if(oldObj.value) newObject.value = nValue;
  if(oldObj.name) newObject.name = oldObj.name;
  if(oldObj.id) newObject.id = oldObj.id;
  if(oldObj.className) newObject.className = oldObj.className;
  oldObj.parentNode.replaceChild(newObject,oldObj);
  return newObject;
}

And you do a call like:

changeInputType(document.getElementById('DATE_RANGE_VALUE'), 'checkbox', 7);

You can also use the provided CLI tool mysqlcheck to run the optimizations. It's got a ton of switches but at its most basic you just pass in the database, username, and password.

Adding this to cron or the Windows Scheduler can make this an automated process. (MariaDB but basically the same thing.)

You can also hide a column using the col element https://developer.mozilla.org/en/docs/Web/HTML/Element/col

To hide the second column in a table:

<table>
  <col />
  <col style="visibility:collapse"/>
  <tr><td>visible</td><td>hidden</td></tr>
  <tr><td>visible</td><td>hidden</td></tr>

Known issues: this won't work in Google Chrome. Please vote for the bug at https://bugs.chromium.org/p/chromium/issues/detail?id=174167

For all the collections including map use: isEmpty method which is there on these collection objects. But you have to do a null check before:

Map<String, String> map;

........
if(map!=null && !map.isEmpty())
......

Welcome to the wonderful world of portability... or rather the lack of it. Before we start analyzing these two options in detail and take a deeper look how different operating systems handle them, it should be noted that the BSD socket implementation is the mother of all socket implementations. Basically all other systems copied the BSD socket implementation at some point in time (or at least its interfaces) and then started evolving it on their own. Of course the BSD socket implementation was evolved as well at the same time and thus systems that copied it later got features that were lacking in systems that copied it earlier. Understanding the BSD socket implementation is the key to understanding all other socket implementations, so you should read about it even if you don't care to ever write code for a BSD system.

There are a couple of basics you should know before we look at these two options. A TCP/UDP connection is identified by a tuple of five values:

{<protocol>, <src addr>, <src port>, <dest addr>, <dest port>}

Any unique combination of these values identifies a connection. As a result, no two connections can have the same five values, otherwise the system would not be able to distinguish these connections any longer.

The protocol of a socket is set when a socket is created with the socket() function. The source address and port are set with the bind() function. The destination address and port are set with the connect() function. Since UDP is a connectionless protocol, UDP sockets can be used without connecting them. Yet it is allowed to connect them and in some cases very advantageous for your code and general application design. In connectionless mode, UDP sockets that were not explicitly bound when data is sent over them for the first time are usually automatically bound by the system, as an unbound UDP socket cannot receive any (reply) data. Same is true for an unbound TCP socket, it is automatically bound before it will be connected.

If you explicitly bind a socket, it is possible to bind it to port 0, which means "any port". Since a socket cannot really be bound to all existing ports, the system will have to choose a specific port itself in that case (usually from a predefined, OS specific range of source ports). A similar wildcard exists for the source address, which can be "any address" (0.0.0.0 in case of IPv4 and :: in case of IPv6). Unlike in case of ports, a socket can really be bound to "any address" which means "all source IP addresses of all local interfaces". If the socket is connected later on, the system has to choose a specific source IP address, since a socket cannot be connected and at the same time be bound to any local IP address. Depending on the destination address and the content of the routing table, the system will pick an appropriate source address and replace the "any" binding with a binding to the chosen source IP address.

By default, no two sockets can be bound to the same combination of source address and source port. As long as the source port is different, the source address is actually irrelevant. Binding socketA to ipA:portA and socketB to ipB:portB is always possible if ipA != ipB holds true, even when portA == portB. E.g. socketA belongs to a FTP server program and is bound to 192.168.0.1:21 and socketB belongs to another FTP server program and is bound to 10.0.0.1:21, both bindings will succeed. Keep in mind, though, that a socket may be locally bound to "any address". If a socket is bound to 0.0.0.0:21, it is bound to all existing local addresses at the same time and in that case no other socket can be bound to port 21, regardless which specific IP address it tries to bind to, as 0.0.0.0 conflicts with all existing local IP addresses.

Anything said so far is pretty much equal for all major operating system. Things start to get OS specific when address reuse comes into play. We start with BSD, since as I said above, it is the mother of all socket implementations.

BSD

SO_REUSEADDR

If SO_REUSEADDR is enabled on a socket prior to binding it, the socket can be successfully bound unless there is a conflict with another socket bound to exactly the same combination of source address and port. Now you may wonder how is that any different than before? The keyword is "exactly". SO_REUSEADDR mainly changes the way how wildcard addresses ("any IP address") are treated when searching for conflicts.

Without SO_REUSEADDR, binding socketA to 0.0.0.0:21 and then binding socketB to 192.168.0.1:21 will fail (with error EADDRINUSE), since 0.0.0.0 means "any local IP address", thus all local IP addresses are considered in use by this socket and this includes 192.168.0.1, too. With SO_REUSEADDR it will succeed, since 0.0.0.0 and 192.168.0.1 are not exactly the same address, one is a wildcard for all local addresses and the other one is a very specific local address. Note that the statement above is true regardless in which order socketA and socketB are bound; without SO_REUSEADDR it will always fail, with SO_REUSEADDR it will always succeed.

To give you a better overview, let's make a table here and list all possible combinations:

SO_REUSEADDR       socketA        socketB       Result
---------------------------------------------------------------------
  ON/OFF       192.168.0.1:21   192.168.0.1:21    Error (EADDRINUSE)
  ON/OFF       192.168.0.1:21      10.0.0.1:21    OK
  ON/OFF          10.0.0.1:21   192.168.0.1:21    OK
   OFF             0.0.0.0:21   192.168.1.0:21    Error (EADDRINUSE)
   OFF         192.168.1.0:21       0.0.0.0:21    Error (EADDRINUSE)
   ON              0.0.0.0:21   192.168.1.0:21    OK
   ON          192.168.1.0:21       0.0.0.0:21    OK
  ON/OFF           0.0.0.0:21       0.0.0.0:21    Error (EADDRINUSE)

The table above assumes that socketA has already been successfully bound to the address given for socketA, then socketB is created, either gets SO_REUSEADDR set or not, and finally is bound to the address given for socketB. Result is the result of the bind operation for socketB. If the first column says ON/OFF, the value of SO_REUSEADDR is irrelevant to the result.

Okay, SO_REUSEADDR has an effect on wildcard addresses, good to know. Yet that isn't it's only effect it has. There is another well known effect which is also the reason why most people use SO_REUSEADDR in server programs in the first place. For the other important use of this option we have to take a deeper look on how the TCP protocol works.

A socket has a send buffer and if a call to the send() function succeeds, it does not mean that the requested data has actually really been sent out, it only means the data has been added to the send buffer. For UDP sockets, the data is usually sent pretty soon, if not immediately, but for TCP sockets, there can be a relatively long delay between adding data to the send buffer and having the TCP implementation really send that data. As a result, when you close a TCP socket, there may still be pending data in the send buffer, which has not been sent yet but your code considers it as sent, since the send() call succeeded. If the TCP implementation was closing the socket immediately on your request, all of this data would be lost and your code wouldn't even know about that. TCP is said to be a reliable protocol and losing data just like that is not very reliable. That's why a socket that still has data to send will go into a state called TIME_WAIT when you close it. In that state it will wait until all pending data has been successfully sent or until a timeout is hit, in which case the socket is closed forcefully.

At most, the amount of time the kernel will wait before it closes the socket, regardless if it still has data in flight or not, is called the Linger Time. The Linger Time is globally configurable on most systems and by default rather long (two minutes is a common value you will find on many systems). It is also configurable per socket using the socket option SO_LINGER which can be used to make the timeout shorter or longer, and even to disable it completely. Disabling it completely is a very bad idea, though, since closing a TCP socket gracefully is a slightly complex process and involves sending forth and back a couple of packets (as well as resending those packets in case they got lost) and this whole close process is also limited by the Linger Time. If you disable lingering, your socket may not only lose data in flight, it is also always closed forcefully instead of gracefully, which is usually not recommended. The details about how a TCP connection is closed gracefully are beyond the scope of this answer, if you want to learn more about, I recommend you have a look at this page. And even if you disabled lingering with SO_LINGER, if your process dies without explicitly closing the socket, BSD (and possibly other systems) will linger nonetheless, ignoring what you have configured. This will happen for example if your code just calls exit() (pretty common for tiny, simple server programs) or the process is killed by a signal (which includes the possibility that it simply crashes because of an illegal memory access). So there is nothing you can do to make sure a socket will never linger under all circumstances.

The question is, how does the system treat a socket in state TIME_WAIT? If SO_REUSEADDR is not set, a socket in state TIME_WAIT is considered to still be bound to the source address and port and any attempt to bind a new socket to the same address and port will fail until the socket has really been closed, which may take as long as the configured Linger Time. So don't expect that you can rebind the source address of a socket immediately after closing it. In most cases this will fail. However, if SO_REUSEADDR is set for the socket you are trying to bind, another socket bound to the same address and port in state TIME_WAIT is simply ignored, after all its already "half dead", and your socket can bind to exactly the same address without any problem. In that case it plays no role that the other socket may have exactly the same address and port. Note that binding a socket to exactly the same address and port as a dying socket in TIME_WAIT state can have unexpected, and usually undesired, side effects in case the other socket is still "at work", but that is beyond the scope of this answer and fortunately those side effects are rather rare in practice.

There is one final thing you should know about SO_REUSEADDR. Everything written above will work as long as the socket you want to bind to has address reuse enabled. It is not necessary that the other socket, the one which is already bound or is in a TIME_WAIT state, also had this flag set when it was bound. The code that decides if the bind will succeed or fail only inspects the SO_REUSEADDR flag of the socket fed into the bind() call, for all other sockets inspected, this flag is not even looked at.

SO_REUSEPORT

SO_REUSEPORT is what most people would expect SO_REUSEADDR to be. Basically, SO_REUSEPORT allows you to bind an arbitrary number of sockets to exactly the same source address and port as long as all prior bound sockets also had SO_REUSEPORT set before they were bound. If the first socket that is bound to an address and port does not have SO_REUSEPORT set, no other socket can be bound to exactly the same address and port, regardless if this other socket has SO_REUSEPORT set or not, until the first socket releases its binding again. Unlike in case of SO_REUESADDR the code handling SO_REUSEPORT will not only verify that the currently bound socket has SO_REUSEPORT set but it will also verify that the socket with a conflicting address and port had SO_REUSEPORT set when it was bound.

SO_REUSEPORT does not imply SO_REUSEADDR. This means if a socket did not have SO_REUSEPORT set when it was bound and another socket has SO_REUSEPORT set when it is bound to exactly the same address and port, the bind fails, which is expected, but it also fails if the other socket is already dying and is in TIME_WAIT state. To be able to bind a socket to the same addresses and port as another socket in TIME_WAIT state requires either SO_REUSEADDR to be set on that socket or SO_REUSEPORT must have been set on both sockets prior to binding them. Of course it is allowed to set both, SO_REUSEPORT and SO_REUSEADDR, on a socket.

There is not much more to say about SO_REUSEPORT other than that it was added later than SO_REUSEADDR, that's why you will not find it in many socket implementations of other systems, which "forked" the BSD code before this option was added, and that there was no way to bind two sockets to exactly the same socket address in BSD prior to this option.

Connect() Returning EADDRINUSE?

Most people know that bind() may fail with the error EADDRINUSE, however, when you start playing around with address reuse, you may run into the strange situation that connect() fails with that error as well. How can this be? How can a remote address, after all that's what connect adds to a socket, be already in use? Connecting multiple sockets to exactly the same remote address has never been a problem before, so what's going wrong here?

As I said on the very top of my reply, a connection is defined by a tuple of five values, remember? And I also said, that these five values must be unique otherwise the system cannot distinguish two connections any longer, right? Well, with address reuse, you can bind two sockets of the same protocol to the same source address and port. That means three of those five values are already the same for these two sockets. If you now try to connect both of these sockets also to the same destination address and port, you would create two connected sockets, whose tuples are absolutely identical. This cannot work, at least not for TCP connections (UDP connections are no real connections anyway). If data arrived for either one of the two connections, the system could not tell which connection the data belongs to. At least the destination address or destination port must be different for either connection, so that the system has no problem to identify to which connection incoming data belongs to.

So if you bind two sockets of the same protocol to the same source address and port and try to connect them both to the same destination address and port, connect() will actually fail with the error EADDRINUSE for the second socket you try to connect, which means that a socket with an identical tuple of five values is already connected.

Multicast Addresses

Most people ignore the fact that multicast addresses exist, but they do exist. While unicast addresses are used for one-to-one communication, multicast addresses are used for one-to-many communication. Most people got aware of multicast addresses when they learned about IPv6 but multicast addresses also existed in IPv4, even though this feature was never widely used on the public Internet.

The meaning of SO_REUSEADDR changes for multicast addresses as it allows multiple sockets to be bound to exactly the same combination of source multicast address and port. In other words, for multicast addresses SO_REUSEADDR behaves exactly as SO_REUSEPORT for unicast addresses. Actually, the code treats SO_REUSEADDR and SO_REUSEPORT identically for multicast addresses, that means you could say that SO_REUSEADDR implies SO_REUSEPORT for all multicast addresses and the other way round.

FreeBSD/OpenBSD/NetBSD

All these are rather late forks of the original BSD code, that's why they all three offer the same options as BSD and they also behave the same way as in BSD.

macOS (MacOS X)

At its core, macOS is simply a BSD-style UNIX named "Darwin", based on a rather late fork of the BSD code (BSD 4.3), which was then later on even re-synchronized with the (at that time current) FreeBSD 5 code base for the Mac OS 10.3 release, so that Apple could gain full POSIX compliance (macOS is POSIX certified). Despite having a microkernel at its core ("Mach"), the rest of the kernel ("XNU") is basically just a BSD kernel, and that's why macOS offers the same options as BSD and they also behave the same way as in BSD.

iOS / watchOS / tvOS

iOS is just a macOS fork with a slightly modified and trimmed kernel, somewhat stripped down user space toolset and a slightly different default framework set. watchOS and tvOS are iOS forks, that are stripped down even further (especially watchOS). To my best knowledge they all behave exactly as macOS does.

Linux

Linux < 3.9

Prior to Linux 3.9, only the option SO_REUSEADDR existed. This option behaves generally the same as in BSD with two important exceptions:

1. As long as a listening (server) TCP socket is bound to a specific port, the SO_REUSEADDR option is entirely ignored for all sockets targeting that port. Binding a second socket to the same port is only possible if it was also possible in BSD without having SO_REUSEADDR set. E.g. you cannot bind to a wildcard address and then to a more specific one or the other way round, both is possible in BSD if you set SO_REUSEADDR. What you can do is you can bind to the same port and two different non-wildcard addresses, as that's always allowed. In this aspect Linux is more restrictive than BSD.

2. The second exception is that for client sockets, this option behaves exactly like SO_REUSEPORT in BSD, as long as both had this flag set before they were bound. The reason for allowing that was simply that it is important to be able to bind multiple sockets to exactly to the same UDP socket address for various protocols and as there used to be no SO_REUSEPORT prior to 3.9, the behavior of SO_REUSEADDR was altered accordingly to fill that gap. In that aspect Linux is less restrictive than BSD.

Linux >= 3.9

Linux 3.9 added the option SO_REUSEPORT to Linux as well. This option behaves exactly like the option in BSD and allows binding to exactly the same address and port number as long as all sockets have this option set prior to binding them.

Yet, there are still two differences to SO_REUSEPORT on other systems:

1. To prevent "port hijacking", there is one special limitation: All sockets that want to share the same address and port combination must belong to processes that share the same effective user ID! So one user cannot "steal" ports of another user. This is some special magic to somewhat compensate for the missing SO_EXCLBIND/SO_EXCLUSIVEADDRUSE flags.

2. Additionally the kernel performs some "special magic" for SO_REUSEPORT sockets that isn't found in other operating systems: For UDP sockets, it tries to distribute datagrams evenly, for TCP listening sockets, it tries to distribute incoming connect requests (those accepted by calling accept()) evenly across all the sockets that share the same address and port combination. Thus an application can easily open the same port in multiple child processes and then use SO_REUSEPORT to get a very inexpensive load balancing.

Android

Even though the whole Android system is somewhat different from most Linux distributions, at its core works a slightly modified Linux kernel, thus everything that applies to Linux should apply to Android as well.

Windows

Windows only knows the SO_REUSEADDR option, there is no SO_REUSEPORT. Setting SO_REUSEADDR on a socket in Windows behaves like setting SO_REUSEPORT and SO_REUSEADDR on a socket in BSD, with one exception:

Prior to Windows 2003, a socket with SO_REUSEADDR could always been bound to exactly the same source address and port as an already bound socket, even if the other socket did not have this option set when it was bound. This behavior allowed an application "to steal" the connected port of another application. Needless to say that this has major security implications!

Microsoft realized that and added another important socket option: SO_EXCLUSIVEADDRUSE. Setting SO_EXCLUSIVEADDRUSE on a socket makes sure that if the binding succeeds, the combination of source address and port is owned exclusively by this socket and no other socket can bind to them, not even if it has SO_REUSEADDR set.

This default behavior was changed first in Windows 2003, Microsoft calls that "Enhanced Socket Security" (funny name for a behavior that is default on all other major operating systems). For more details just visit this page. There are three tables: The first one shows the classic behavior (still in use when using compatibility modes!), the second one shows the behavior of Windows 2003 and up when the bind() calls are made by the same user, and the third one when the bind() calls are made by different users.

Solaris

Solaris is the successor of SunOS. SunOS was originally based on a fork of BSD, SunOS 5 and later was based on a fork of SVR4, however SVR4 is a merge of BSD, System V, and Xenix, so up to some degree Solaris is also a BSD fork, and a rather early one. As a result Solaris only knows SO_REUSEADDR, there is no SO_REUSEPORT. The SO_REUSEADDR behaves pretty much the same as it does in BSD. As far as I know there is no way to get the same behavior as SO_REUSEPORT in Solaris, that means it is not possible to bind two sockets to exactly the same address and port.

Similar to Windows, Solaris has an option to give a socket an exclusive binding. This option is named SO_EXCLBIND. If this option is set on a socket prior to binding it, setting SO_REUSEADDR on another socket has no effect if the two sockets are tested for an address conflict. E.g. if socketA is bound to a wildcard address and socketB has SO_REUSEADDR enabled and is bound to a non-wildcard address and the same port as socketA, this bind will normally succeed, unless socketA had SO_EXCLBIND enabled, in which case it will fail regardless the SO_REUSEADDR flag of socketB.

Other Systems

In case your system is not listed above, I wrote a little test program that you can use to find out how your system handles these two options. Also if you think my results are wrong, please first run that program before posting any comments and possibly making false claims.

All that the code requires to build is a bit POSIX API (for the network parts) and a C99 compiler (actually most non-C99 compiler will work as well as long as they offer inttypes.h and stdbool.h; e.g. gcc supported both long before offering full C99 support).

All that the program needs to run is that at least one interface in your system (other than the local interface) has an IP address assigned and that a default route is set which uses that interface. The program will gather that IP address and use it as the second "specific address".

It tests all possible combinations you can think of:

• TCP and UDP protocol
• Normal sockets, listen (server) sockets, multicast sockets
• SO_REUSEADDR set on socket1, socket2, or both sockets
• SO_REUSEPORT set on socket1, socket2, or both sockets
• All address combinations you can make out of 0.0.0.0 (wildcard), 127.0.0.1 (specific address), and the second specific address found at your primary interface (for multicast it's just 224.1.2.3 in all tests)

and prints the results in a nice table. It will also work on systems that don't know SO_REUSEPORT, in which case this option is simply not tested.

What the program cannot easily test is how SO_REUSEADDR acts on sockets in TIME_WAIT state as it's very tricky to force and keep a socket in that state. Fortunately most operating systems seems to simply behave like BSD here and most of the time programmers can simply ignore the existence of that state.

Here's the code (I cannot include it here, answers have a size limit and the code would push this reply over the limit).

a = np.array([1, 3, 5, 6, 9, 10, 14, 15, 56])
np.argwhere((a>=6) & (a<=10))

The percent symbol means: any host, including remote and local connections.

The localhost allows only local connections.

(so to start off, if you don't need remote connections to your database, you can get rid of the appuser@'%' user right away)

So, yes, they are overlapping, but...

...there is a reason for setting both types of accounts, this is explained in the mysql docs: http://dev.mysql.com/doc/refman/5.7/en/adding-users.html.

If you have an have an anonymous user on your localhost, which you can spot with:

select Host from mysql.user where User='' and Host='localhost';

and if you just create the user appuser@'%' (and you not the appuser@'localhost'), then when the appuser mysql user connects from the local host, the anonymous user account is used (it has precedence over your appuser@'%' user).

And the fix for this is (as one can guess) to create the appuser@'localhost' (which is more specific that the local host anonymous user and will be used if your appuser connects from the localhost).

it turns out that I got this error because my requested module is not bundled in the minification prosses due to path misspelling

so make sure that your module exists in minified js file (do search for a word within it to be sure)

Not the best method, use an array instead. This is just an alternative method.

http://www.w3schools.com/jsref/jsref_getday.asp

var date = new Date();
var day = date.getDay();

You should really use google before you post here.

Since other people posted the array method I'll show you an alternative way using a switch statement.

switch(day) {
    case 0:
        day = "Sunday";
        break;
    case 1:
        day = "Monday";
        break;

    ... rest of cases

    default:
        // do something
        break;
}

The above works, however, the array is the better alternative. You may also use if() statements however a switch statement would be much cleaner then several if's.

Maybe I read the problem wrong, but I believe you already have inserted the course 11 records and simply need to update those that meet the criteria you listed with course 6's data.

If this is the case, you'll want to use an UPDATE...FROM statement:

UPDATE MyTable
SET
    complete = 1,
    complete_date = newdata.complete_date,
    post_score = newdata.post_score
FROM
    (
    SELECT
        userID,
        complete_date,
        post_score
    FROM MyTable
    WHERE
        courseID = 6
        AND complete = 1
        AND complete_date > '8/1/2008'
    ) newdata
WHERE
    CourseID = 11
    AND userID = newdata.userID

See this related SO question for more info

var sels = //Here is your array of SELECTs
var json = { };

for(var i = 0, l = sels.length; i < l; i++) {
  json[sels[i].id] = sels[i].value;
}

For Spring 5.2+ this works for me:

@PostMapping("/foo")
ResponseEntity<Void> foo(@PathVariable UUID fooId) {
    return fooService.findExam(fooId)
            .map(uri -> ResponseEntity.noContent().<Void>build())
            .orElse(ResponseEntity.notFound().build());
}

dovescrywolf gave tip as a comment on article linked by Davide Inglima

It was was very useful for me on MacOS.

• Close Eclipse if it's opened.

• Open Termnal (bash console) and do below things:

  $ pwd /Users/You/YourEclipseInstalationDirectory  
  $ cd Eclipse.app/Contents/MacOS/  
  $ echo "-Duser.name=Your Name" >> eclipse.ini  
  $ cat eclipse.ini
  

• Close Terminal and start/open Eclipse again.

if (dr[dc.ColumnName].GetType().ToString() == "System.DateTime")

Like I use on PHP and JavaScript:

<input type="hidden" id="CatId" value="<?php echo $categoryId; ?>">

Update the JavaScript:

var categoryId = document.getElementById('CatId').value;

Just use inline if operation with tuple function:

query = "Select * from hr_employee WHERE id in " % tuple(employee_ids) if len(employee_ids) != 1 else "("+ str(employee_ids[0]) + ")"

You can do it like this, and no need to dedicate variable:

Toolbar toolbar = findViewById(R.id.toolbar);
Menu menu = toolbar.getMenu();
MenuItem menuItem = menu.findItem(R.id.some_action);
menuItem.setTitle("New title");

Or a little simplified:

MenuItem menuItem = ((Toolbar)findViewById(R.id.toolbar)).getMenu().findItem(R.id.some_action);
menuItem.setTitle("New title");

It works only - after the menu created.

[Update]

While the solution under "old answer" will work for general problems, this section is to answer your specific question after clarification from your comment.

You should be able to set environment variables exactly like you specify in your question. As an example, I have a Heroku app that uses HTTP basic authentication.

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  protect_from_forgery
  before_filter :authenticate

  def authenticate
    authenticate_or_request_with_http_basic do |username, password|
      username == ENV['HTTP_USER'] && password == ENV['HTTP_PASS']
    end
  end
end

# config/initializers/dev_environment.rb
unless Rails.env.production?
  ENV['HTTP_USER'] = 'testuser'
  ENV['HTTP_PASS'] = 'testpass'
end

So in your case you would use

unless Rails.env.production?
  ENV['admin_password'] = "secret"
end

Don't forget to restart the server so the configuration is reloaded!

[Old Answer]

For app-wide configuration, you might consider a solution like the following:

Create a file config/application.yml with a hash of options you want to be able to access:

admin_password: something_secret
allow_registration: true
facebook:
  app_id: application_id_here
  app_secret: application_secret_here
  api_key: api_key_here

Now, create the file config/initializers/app_config.rb and include the following:

require 'yaml'

yaml_data = YAML::load(ERB.new(IO.read(File.join(Rails.root, 'config', 'application.yml'))).result)
APP_CONFIG = HashWithIndifferentAccess.new(yaml_data)

Now, anywhere in your application, you can access APP_CONFIG[:admin_password], along with all your other data. (Note that since the initializer includes ERB.new, your YAML file can contain ERB markup.)

label {
  width:200px;
  display: inline-block;
}

OR 

label {
  width:200px;
  display: inline-flex;
}

OR 

label {
  width:200px;
  display: inline-table;
}

• Open the server tab in eclipse
• right click open
• click on open lauch configuration
• Go to arguments

• Here you can add in VM arguments after endorsed

  -Xms64m -Xmx256m
  

Following is an example. You can see the details http://jkssweetlife.com/configure-slf4j-working-various-logging-frameworks/ and download the full codes here.

• Add following dependency to your pom if you are using maven, otherwise, just download the jar files and put on your classpath

  <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.7</version>
  </dependency>
  
  <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.7</version>
  </dependency>
  

• Configure log4j.properties

  log4j.rootLogger=TRACE, stdout
  log4j.appender.stdout=org.apache.log4j.ConsoleAppender
  log4j.appender.stdout.Target=System.out
  log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
  log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd'T'HH:mm:ss.SSS} %-5p [%c] - %m%n
  

• Java example

  public class Slf4jExample {
      public static void main(String[] args) {
  
          Logger logger = LoggerFactory.getLogger(Slf4jExample.class);
  
          final String message = "Hello logging!";
          logger.trace(message);
          logger.debug(message);
          logger.info(message);
          logger.warn(message);
          logger.error(message);
      }
  }
  

Try it:

int rc=dgvDataRc.CurrentCell.RowIndex;** //for find the row index number
MessageBox.Show("Current Row Index is = " + rc.ToString());

I hope it will help you.

You need to map the unique route to specify your parameters as query elements. In RouteConfig.cs (or WebApiConfig.cs) add:

config.Routes.MapHttpRoute(
            name: "MyPagedQuery",
            routeTemplate:     "api/{controller}/{action}/{firstId}/{countToFetch}",
            defaults: new { action = "GetNDepartmentsFromID" }
        );

Here's a C++ example, based on some of the references. This is quick and dirty, you are better off not re-inventing and using the boost library.

#include "math.h" // for RAND, and rand
double sampleNormal() {
    double u = ((double) rand() / (RAND_MAX)) * 2 - 1;
    double v = ((double) rand() / (RAND_MAX)) * 2 - 1;
    double r = u * u + v * v;
    if (r == 0 || r > 1) return sampleNormal();
    double c = sqrt(-2 * log(r) / r);
    return u * c;
}

You can use a Q-Q plot to examine the results and see how well it approximates a real normal distribution (rank your samples 1..x, turn the ranks into proportions of total count of x ie. how many samples, get the z-values and plot them. An upwards straight line is the desired result).

You're most likely using this on a local file over the file:// URI scheme, which cannot have cookies set. Put it on a local server so you can use http://localhost.

I had come across this problem many times. There is cl.exe but for some strange reason pip couldn't find it, even if we run the command from the bin folder where cl.exe is present. Try using conda installer, it worked fine for me.

As you can see in the following image, pip is not able to find the cl.exe. Then I tried installing using conda

And to my surprise it gets installed without an error once you have the right version of vs cpp build tools installed, i.e. v14.0 in the right directory.

hi @JackSlayer94 please find the below example to understand how to make an array of size 5.

class Hero {_x000D_
    name: string;_x000D_
    constructor(text: string) {_x000D_
        this.name = text;_x000D_
    }_x000D_
_x000D_
    display() {_x000D_
        return "Hello, " + this.name;_x000D_
    }_x000D_
_x000D_
}_x000D_
_x000D_
let heros:Hero[] = new Array(5);_x000D_
for (let i = 0; i < 5; i++){_x000D_
    heros[i] = new Hero("Name: " + i);_x000D_
}_x000D_
_x000D_
for (let i = 0; i < 5; i++){_x000D_
    console.log(heros[i].display());_x000D_
}

The Tuple approach :

This solution provides a strict FixedLengthArray (ak.a. SealedArray) type signature based in Tuples.

Syntax example :

// Array containing 3 strings
let foo : FixedLengthArray<[string, string, string]> 

This is the safest approach, considering it prevents accessing indexes out of the boundaries.

Implementation :

type ArrayLengthMutationKeys = 'splice' | 'push' | 'pop' | 'shift' | 'unshift' | number
type ArrayItems<T extends Array<any>> = T extends Array<infer TItems> ? TItems : never
type FixedLengthArray<T extends any[]> =
  Pick<T, Exclude<keyof T, ArrayLengthMutationKeys>>
  & { [Symbol.iterator]: () => IterableIterator< ArrayItems<T> > }

Tests :

var myFixedLengthArray: FixedLengthArray< [string, string, string]>

// Array declaration tests
myFixedLengthArray = [ 'a', 'b', 'c' ]  // ? OK
myFixedLengthArray = [ 'a', 'b', 123 ]  // ? TYPE ERROR
myFixedLengthArray = [ 'a' ]            // ? LENGTH ERROR
myFixedLengthArray = [ 'a', 'b' ]       // ? LENGTH ERROR

// Index assignment tests 
myFixedLengthArray[1] = 'foo'           // ? OK
myFixedLengthArray[1000] = 'foo'        // ? INVALID INDEX ERROR

// Methods that mutate array length
myFixedLengthArray.push('foo')          // ? MISSING METHOD ERROR
myFixedLengthArray.pop()                // ? MISSING METHOD ERROR

// Direct length manipulation
myFixedLengthArray.length = 123         // ? READ-ONLY ERROR

// Destructuring
var [ a ] = myFixedLengthArray          // ? OK
var [ a, b ] = myFixedLengthArray       // ? OK
var [ a, b, c ] = myFixedLengthArray    // ? OK
var [ a, b, c, d ] = myFixedLengthArray // ? INVALID INDEX ERROR

(*) This solution requires the noImplicitAny typescript configuration directive to be enabled in order to work (commonly recommended practice)

The Array(ish) approach :

This solution behaves as an augmentation of the Array type, accepting an additional second parameter(Array length). Is not as strict and safe as the Tuple based solution.

Syntax example :

let foo: FixedLengthArray<string, 3> 

Keep in mind that this approach will not prevent you from accessing an index out of the declared boundaries and set a value on it.

Implementation :

type ArrayLengthMutationKeys = 'splice' | 'push' | 'pop' | 'shift' |  'unshift'
type FixedLengthArray<T, L extends number, TObj = [T, ...Array<T>]> =
  Pick<TObj, Exclude<keyof TObj, ArrayLengthMutationKeys>>
  & {
    readonly length: L 
    [ I : number ] : T
    [Symbol.iterator]: () => IterableIterator<T>   
  }

Tests :

var myFixedLengthArray: FixedLengthArray<string,3>

// Array declaration tests
myFixedLengthArray = [ 'a', 'b', 'c' ]  // ? OK
myFixedLengthArray = [ 'a', 'b', 123 ]  // ? TYPE ERROR
myFixedLengthArray = [ 'a' ]            // ? LENGTH ERROR
myFixedLengthArray = [ 'a', 'b' ]       // ? LENGTH ERROR

// Index assignment tests 
myFixedLengthArray[1] = 'foo'           // ? OK
myFixedLengthArray[1000] = 'foo'        // ? SHOULD FAIL

// Methods that mutate array length
myFixedLengthArray.push('foo')          // ? MISSING METHOD ERROR
myFixedLengthArray.pop()                // ? MISSING METHOD ERROR

// Direct length manipulation
myFixedLengthArray.length = 123         // ? READ-ONLY ERROR

// Destructuring
var [ a ] = myFixedLengthArray          // ? OK
var [ a, b ] = myFixedLengthArray       // ? OK
var [ a, b, c ] = myFixedLengthArray    // ? OK
var [ a, b, c, d ] = myFixedLengthArray // ? SHOULD FAIL

You need to provide a default value:

new_field = models.CharField(max_length=140, default='SOME STRING')

Whoa. You're really over-complicating it by a very long distance. Try:

>>> print hex(0x12ef ^ 0xabcd)
0xb922

You seem to be ignoring these handy facts, at least:

• Python has native support for hexadecimal integer literals, with the 0x prefix.
• "Hexadecimal" is just a presentation detail; the arithmetic is done in binary, and then the result is printed as hex.
• There is no connection between the format of the inputs (the hexadecimal literals) and the output, there is no such thing as a "hexadecimal number" in a Python variable.
• The hex() function can be used to convert any number into a hexadecimal string for display.

If you already have the numbers as strings, you can use the int() function to convert to numbers, by providing the expected base (16 for hexadecimal numbers):

>>> print int("12ef", 16)
4874

So you can do two conversions, perform the XOR, and then convert back to hex:

>>> print hex(int("12ef", 16) ^ int("abcd", 16))
0xb922

For versions prior to R2014a...

One easy non-loop approach would be to use genvarname to create a cell array of strings:

>> N = 5;
>> f = genvarname(repmat({'f'}, 1, N), 'f')

f = 

    'f1'    'f2'    'f3'    'f4'    'f5'

For newer versions...

The function genvarname has been deprecated, so matlab.lang.makeUniqueStrings can be used instead in the following way to get the same output:

>> N = 5;
>> f = strrep(matlab.lang.makeUniqueStrings(repmat({'f'}, 1, N), 'f'), '_', '')

 f =
   1×5 cell array

     'f1'    'f2'    'f3'    'f4'    'f5'

U cant try this

for (WordList i : words) {
     words.get(words.indexOf(i));
 }

do a :

git branch

if git show you something like :

* (no branch)
master
Dbranch

You have a "detached HEAD". If you have modify some files on this branch you, commit them, then return to master with

git checkout master 

Now you should be able to delete the Dbranch.

If the data is populated from the database, you might consider not using an <input> tag to display it. Nevertheless, you can disable it right in the tag:

<input type='text' value='${magic.database.value}' disabled>

If you need to disable it with Javascript later, you can set the "disabled" attribute:

document.getElementById('theInput').disabled = true;

The reason I suggest not showing the value as an <input> is that, in my experience, it causes layout issues. If the text is long, then in an <input> the user will need to try and scroll the text, which is not something normal people would guess to do. If you just drop it into a <span> or something, you have more styling flexibility.

foreach (DataRow dr in ds.Tables[0].Rows)
{
    //your code here
}

If it's not work in your centos 7 machine "export CATALINA_OPTS="-Xms512M -Xmx1024M"" then you can change heap memory from vi /etc/systemd/system/tomcat.service file then this value shown in your tomcat by help of ps -ef|grep tomcat.

Ugly, but:

<div *ngFor="let a of [aVariable]">
  <span>{{a}}</span>
</div>

When used with async pipe:

<div *ngFor="let a of [aVariable | async]">
  <span>{{a.prop1}}</span>
  <span>{{a.prop2}}</span>
</div>

From http://sed.sourceforge.net/sed1line.txt: (Please don't ask me how this works ;-) )

 # delete duplicate, consecutive lines from a file (emulates "uniq").
 # First line in a set of duplicate lines is kept, rest are deleted.
 sed '$!N; /^\(.*\)\n\1$/!P; D'

 # delete duplicate, nonconsecutive lines from a file. Beware not to
 # overflow the buffer size of the hold space, or else use GNU sed.
 sed -n 'G; s/\n/&&/; /^\([ -~]*\n\).*\n\1/d; s/\n//; h; P'

The ".a" at the end of your DLL files is a problem, and those are there because you didn't use CMAKE to build OpenCV 2.0. Additionally you do not link to the DLL files, you link to the library files, and again, the reason you do not see the correct library files is because you didn't use CMAKE to build OpenCV 2.0. If you want to use OpenCV 2.0 you must build it for it to work correctly in Visual Studio. If you do not want to build it then I would suggest downgrading to OpenCV 1.1pre, it comes pre-built and is much more forgiving in Visual Studio.

Another option (and the one I would recommend) is to abandon OpenCV and go with EmguCV. I have been playing with OpenCV for about a year and things got much easier when I switched to EmguCV because EmguCV works with .NET, so you can use a language like C# that does not come with all the C++ baggage of pointers, header files, and memory allocation problem.

And as for the question of 64bit vs. 32bit, OpenCV does not officially support 64bit. To be on the safe side open your project properties and change the "Platform Target" under the "Build" tab from "Any CPU" to "X86". This should be done any time you do anything with OpenCV, even if you are using a wrapper like EmguCV.

Easiest thing to do without an interactive rebase is (probably) to make a new branch starting at the commit before the one you want to split, cherry-pick -n the commit, reset, stash, commit the file move, reapply the stash and commit the changes, and then either merge with the former branch or cherry-pick the commits that followed. (Then switch the former branch name to the current head.) (It's probably better to follow MBOs advice and do an interactive rebase.)

For the IBM JVM, the command is the following:

java -verbose:sizes -version

For more information about the IBM SDK for Java 8: http://www-01.ibm.com/support/knowledgecenter/SSYKE2_8.0.0/com.ibm.java.lnx.80.doc/diag/appendixes/defaults.html?lang=en

In Html5, you can now use

<form>
<input type="number" min="1" max="100">
</form>

If you have existing JSON ($ugly_json)

echo nl2br(str_replace(' ', ' ', (json_encode(json_decode($ugly_json), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES))));

This one worked for me:

I set the height from HTML

canvas#scoreLineToAll.ct-chart.tab-pane.active[height="200"]
canvas#scoreLineTo3Months.ct-chart.tab-pane[height="200"]
canvas#scoreLineToYear.ct-chart.tab-pane[height="200"]

Then I disabled to maintaining aspect ratio

options: {
  responsive: true,
  maintainAspectRatio: false,

In order to insert the first record set of a stored procedure into a temporary table you need to know the following:

1. only the first row set of the stored procedure can be inserted into a temporary table
2. the stored procedure must not execute dynamic T-SQL statement (sp_executesql)
3. you need to define the structure of the temporary table first

The above may look as limitation, but IMHO it perfectly makes sense - if you are using sp_executesql you can once return two columns and once ten, and if you have multiple result sets, you cannot insert them into several tables as well - you can insert maximum in two table in one T-SQL statement (using OUTPUT clause and no triggers).

So, the issue is mainly how to define the temporary table structure before performing the EXEC ... INTO ... statement.

• sys.dm_exec_describe_first_result_set_for_object
• sys.dm_exec_describe_first_result_set
• sp_describe_first_result_set

The first works with OBJECT_ID while the second and the third works with Ad-hoc queries as well. I prefer to use the DMV instead of the sp as you can use CROSS APPLY and build the temporary table definitions for multiple procedures at the same time.

SELECT p.name, r.* 
FROM sys.procedures AS p
CROSS APPLY sys.dm_exec_describe_first_result_set_for_object(p.object_id, 0) AS r;

Also, pay attention to the system_type_name field as it can be very useful. It stores the column complete definition. For, example:

smalldatetime
nvarchar(max)
uniqueidentifier
nvarchar(1000)
real
smalldatetime
decimal(18,2)

and you can use it directly in most of the cases to create the table definition.

So, I think in most of the cases (if the stored procedure match certain criteria) you can easily build dynamic statements for solving such issues (create the temporary table, insert the stored procedure result in it, do what you need with the data).

Note, that the objects above fail to define the first result set data in some cases like when dynamic T-SQL statements are executed or temporary tables are used in the stored procedure.

I tested and used this command in kafka confluent V4.0.0 and apache kafka V 1.0.0 and 1.0.1

/opt/kafka/confluent-4.0.0/bin/kafka-configs --zookeeper XX.XX.XX.XX:2181 --entity-type topics --entity-name test --alter --add-config  retention.ms=55000

test is the topic name.

I think it works well in other versions too

For php 5.4 on Centos 6.10, we include these lines in php.ini

extension=/opt/remi/php54/root/usr/lib64/php/modules/pdo.so
extension=/opt/remi/php54/root/usr/lib64/php/modules/pgsql.so
extension=/opt/remi/php54/root/usr/lib64/php/modules/pdo_pgsql.so

It works.

Was CV_FONT_HERSHEY_SIMPLEX in cv(1)? Here's all I have available for cv2 "FONT":

FONT_HERSHEY_COMPLEX
FONT_HERSHEY_COMPLEX_SMALL
FONT_HERSHEY_DUPLEX
FONT_HERSHEY_PLAIN
FONT_HERSHEY_SCRIPT_COMPLEX
FONT_HERSHEY_SCRIPT_SIMPLEX
FONT_HERSHEY_SIMPLEX
FONT_HERSHEY_TRIPLEX
FONT_ITALIC

Dropping the 'CV_' seems to work for me.

cv2.putText(image,"Hello World!!!", (x,y), cv2.FONT_HERSHEY_SIMPLEX, 2, 255)

Exception code c0000005 is the code for an access violation. That means that your program is accessing (either reading or writing) a memory address to which it does not have rights. Most commonly this is caused by:

• Accessing a stale pointer. That is accessing memory that has already been deallocated. Note that such stale pointer accesses do not always result in access violations. Only if the memory manager has returned the memory to the system do you get an access violation.
• Reading off the end of an array. This is when you have an array of length N and you access elements with index >=N.

To solve the problem you'll need to do some debugging. If you are not in a position to get the fault to occur under your debugger on your development machine you should get a crash dump file and load it into your debugger. This will allow you to see where in the code the problem occurred and hopefully lead you to the solution. You'll need to have the debugging symbols associated with the executable in order to see meaningful stack traces.

You need to add:

#include <string>

In your header file.

require(ggplot2)
require(nlme)

set.seed(101)
mp <-data.frame(year=1990:2010)
N <- nrow(mp)

mp <- within(mp,
         {
             wav <- rnorm(N)*cos(2*pi*year)+rnorm(N)*sin(2*pi*year)+5
             wow <- rnorm(N)*wav+rnorm(N)*wav^3
         })

m01 <- gls(wow~poly(wav,3), data=mp, correlation = corARMA(p=1))

Get fitted values (the same as m01$fitted)

fit <- predict(m01)

Normally we could use something like predict(...,se.fit=TRUE) to get the confidence intervals on the prediction, but gls doesn't provide this capability. We use a recipe similar to the one shown at http://glmm.wikidot.com/faq :

V <- vcov(m01)
X <- model.matrix(~poly(wav,3),data=mp)
se.fit <- sqrt(diag(X %*% V %*% t(X)))

Put together a "prediction frame":

predframe <- with(mp,data.frame(year,wav,
                                wow=fit,lwr=fit-1.96*se.fit,upr=fit+1.96*se.fit))

Now plot with geom_ribbon

(p1 <- ggplot(mp, aes(year, wow))+
    geom_point()+
    geom_line(data=predframe)+
    geom_ribbon(data=predframe,aes(ymin=lwr,ymax=upr),alpha=0.3))

It's easier to see that we got the right answer if we plot against wav rather than year:

(p2 <- ggplot(mp, aes(wav, wow))+
    geom_point()+
    geom_line(data=predframe)+
    geom_ribbon(data=predframe,aes(ymin=lwr,ymax=upr),alpha=0.3))

It would be nice to do the predictions with more resolution, but it's a little tricky to do this with the results of poly() fits -- see ?makepredictcall.

I proceeded like this:

chunks=pd.read_table('aphro.csv',chunksize=1000000,sep=';',\
       names=['lat','long','rf','date','slno'],index_col='slno',\
       header=None,parse_dates=['date'])

df=pd.DataFrame()
%time df=pd.concat(chunk.groupby(['lat','long',chunk['date'].map(lambda x: x.year)])['rf'].agg(['sum']) for chunk in chunks)

Use:

cout << "a is " << hex << (int) a <<"; b is " << hex << (int) b << endl;

And if you want padding with leading zeros then:

#include <iomanip>
...
cout << "a is " << setw(2) << setfill('0') << hex << (int) a ; 

As we are using C-style casts, why not go the whole hog with terminal C++ badness and use a macro!

#define HEX( x )
   setw(2) << setfill('0') << hex << (int)( x )

you can then say

cout << "a is " << HEX( a );

Edit: Having said that, MartinStettner's solution is much nicer!

VC Code Version: 1.22.2 Go to: Code -> Preferences -> Keyboard Shortcuts (cmd + K; cms + S); Change (edit): "Add Selection To Next Find Match": "cmd + what you want" // for me this is "cmd + D" and I pur cmd + F; Go to "Copy Line Down": "cmd + D" //edit this and set cmd + D for example And for me that's all - I use mac;

For new Android Studio versions, go to C:\Program Files\Android\Android Studio\jre\bin(or to location of Android Studio installed files) and open command window at this location and type in following command in command prompt:-

java -version

Finally this is for Hibernate 5 in Tomcat.

Compiled all the answers from the above and added my tips which works like a charm for Hibernate 5 and SQL Server 2014.

<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">
   org.hibernate.dialect.SQLServerDialect
</property>
<property name="hibernate.connection.driver_class">
   com.microsoft.sqlserver.jdbc.SQLServerDriver
</property>
<property name="hibernate.connection.url">  
jdbc:sqlserver://localhost\ServerInstanceOrServerName:1433;databaseName=DATABASE_NAME 
</property>
<property name="hibernate.default_schema">theSchemaNameUsuallydbo</property>
<property name="hibernate.connection.username">
   YourUsername
</property>
<property name="hibernate.connection.password">
   YourPasswordForMSSQL
</property>

A vb version

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) Handles Button1.Click
        For saleAMT As Decimal = 0.01D To 0.99D Step 0.01D
            Dim foo As New CashDrawer(0, 0, 0)
            Dim chg As List(Of Money) = foo.MakeChange(saleAMT, 1D)
            Dim t As Decimal = 1 - saleAMT
            Debug.WriteLine(t.ToString("C2"))
            For Each c As Money In chg
                Debug.WriteLine(String.Format("{0} of {1}", c.Count.ToString("N0"), c.moneyValue.ToString("C2")))
            Next
        Next
    End Sub

    Class CashDrawer

        Private _drawer As List(Of Money)

        Public Sub New(Optional ByVal QTYtwoD As Integer = -1, _
                       Optional ByVal QTYoneD As Integer = -1, _
                       Optional ByVal QTYfifty As Integer = -1, _
                       Optional ByVal QTYquarters As Integer = -1, _
                       Optional ByVal QTYdimes As Integer = -1, _
                       Optional ByVal QTYnickels As Integer = -1, _
                       Optional ByVal QTYpennies As Integer = -1)
            _drawer = New List(Of Money)
            _drawer.Add(New Money(2D, QTYtwoD))
            _drawer.Add(New Money(1D, QTYoneD))
            _drawer.Add(New Money(0.5D, QTYfifty))
            _drawer.Add(New Money(0.25D, QTYquarters))
            _drawer.Add(New Money(0.1D, QTYdimes))
            _drawer.Add(New Money(0.05D, QTYnickels))
            _drawer.Add(New Money(0.01D, QTYpennies))
        End Sub

        Public Function MakeChange(ByVal SaleAmt As Decimal, _
                                   ByVal amountTendered As Decimal) As List(Of Money)
            Dim change As Decimal = amountTendered - SaleAmt
            Dim rv As New List(Of Money)
            For Each c As Money In Me._drawer
                change -= (c.NumberOf(change) * c.moneyValue)
                If c.Count > 0 Then
                    rv.Add(c)
                End If
            Next
            If change <> 0D Then Throw New ArithmeticException
            Return rv
        End Function
    End Class

    Class Money
        '-1 equals unlimited qty
        Private _qty As Decimal 'quantity in drawer
        Private _value As Decimal 'value money
        Private _count As Decimal = 0D

        Public Sub New(ByVal theValue As Decimal, _
                       ByVal theQTY As Decimal)
            Me._value = theValue
            Me._qty = theQTY
        End Sub

        ReadOnly Property moneyValue As Decimal
            Get
                Return Me._value
            End Get
        End Property

        Public Function NumberOf(ByVal theAmount As Decimal) As Decimal
            If (Me._qty > 0 OrElse Me._qty = -1) AndAlso Me._value <= theAmount Then
                Dim ct As Decimal = Math.Floor(theAmount / Me._value)
                If Me._qty <> -1D Then 'qty?
                    'limited qty
                    If ct > Me._qty Then 'enough 
                        'no
                        Me._count = Me._qty
                        Me._qty = 0D
                    Else
                        'yes
                        Me._count = ct
                        Me._qty -= ct
                    End If
                Else
                    'unlimited qty
                    Me._count = ct
                End If
            End If
            Return Me._count
        End Function

        ReadOnly Property Count As Decimal
            Get
                Return Me._count
            End Get
        End Property
    End Class
End Class

I solved this using JNA: https://github.com/twall/jna

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;

public class prova {

    private interface CLibrary extends Library {
        CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"), CLibrary.class);
        int system(String cmd);
    }

    private static int exec(String command) {
        return CLibrary.INSTANCE.system(command);
    }

    public static void main(String[] args) {
        exec("ls");
    }
}

Unlike other answers, where you need to follow few steps to use two different github account from same machine, for me it worked in two steps.

You just need to :

1) generate SSH public and private key pair for each of your account under ~/.ssh location with different names and

2) add the generated public keys to the respective account under Settings >> SSH and GPG keys >> New SSH Key.

To generate the SSH public and private key pairs use following command:

cd ~/.ssh
ssh-keygen -t rsa -C "[email protected]" -f "id_rsa_WORK"
ssh-keygen -t rsa -C "[email protected]" -f "id_rsa_PERSONAL"

As a result of above commands, id_rsa_WORK and id_rsa_WORK.pub files will be created for your work account (ex - git.work.com) and id_rsa_PERSONAL and id_rsa_PERSONAL.pub will be created for your personal account (ex - github.com).

Once created, copy the content from each public (*.pub) file and do Step 2 for the each account.

PS : Its not necessary to make an host entry for each git account under ~/.ssh/config file as mentioned in other answers, if hostname of your two accounts are different.

You probably are looking for style="display:none;" which will totally hide your element, whereas the visibility hides it but keeps the screen place it would take...

UPDATE: visible is not a valid property in HTML, that's why it didn't work... See my suggestion above to correctly hide your html element

To export data you need to right click on your results and select export data, after which you will be asked for a specific file format such as insert, loader, or text etc. After selecting this browse your directory and select the export destination.

You could use the NumberFormatter class with its parse method.

Just call dict() on the list of tuples directly

>>> my_list = [('a', 1), ('b', 2)]
>>> dict(my_list)
{'a': 1, 'b': 2}

So for today, jspdf-1.5.3. To answer the question of having the pdf file page exactly same as the canvas. After many tries of different combinations, I figured you gotta do something like this. We first need to set the height and width for the output pdf file with correct orientation, otherwise the sides might be cut off. Then we get the dimensions from the 'pdf' file itself, if you tried to use the canvas's dimensions, the sides might be cut off again. I am not sure why that happens, my best guess is the jsPDF convert the dimensions in other units in the library.

  // Download button
  $("#download-image").on('click', function () {
    let width = __CANVAS.width; 
    let height = __CANVAS.height;

    //set the orientation
    if(width > height){
      pdf = new jsPDF('l', 'px', [width, height]);
    }
    else{
      pdf = new jsPDF('p', 'px', [height, width]);
    }
    //then we get the dimensions from the 'pdf' file itself
    width = pdf.internal.pageSize.getWidth();
    height = pdf.internal.pageSize.getHeight();
    pdf.addImage(__CANVAS, 'PNG', 0, 0,width,height);
    pdf.save("download.pdf");
  });

Learnt about switching orientations from here: https://github.com/MrRio/jsPDF/issues/476

Try this:

apt-get install lib32stdc++6

If the object is created not via a pointer(for example,A a1 = A();),the destructor is called when the object is destructed, always when the function where the object lies is finished.for example:

void func()
{
...
A a1 = A();
...
}//finish

the destructor is called when code is execused to line "finish".

If the object is created via a pointer(for example,A * a2 = new A();),the destructor is called when the pointer is deleted(delete a2;).If the point is not deleted by user explictly or given a new address before deleting it, the memory leak is occured. That is a bug.

In a linked list, if we use std::list<>, we needn't care about the desctructor or memory leak because std::list<> has finished all of these for us. In a linked list written by ourselves, we should write the desctructor and delete the pointer explictly.Otherwise, it will cause memory leak.

We rarely call a destructor manually. It is a function providing for the system.

Sorry for my poor English!

I found these two links which might help you:

1. https://www.reddit.com/r/csharp/comments/2agecc/why_must_visual_studio_be_installed_on_my_system/

2. http://www.placona.co.uk/1196/dotnet/installing-visual-studio-on-a-different-drive/

Basically, at least a portion needs to be installed on a system drive. I'm not sure if your D:\ corresponds to some external drive or an actual system drive but the symlink solution might help.

Good luck

In PyCharm, I'd leave it out. It turns off the UTF-8 indicator at the bottom with a warning that the encoding is hard-coded. Don't think you need the PyCharm comment mentioned above.

The name accepted into TR1 (and the draft for the next standard) is std::unordered_map, so if you have that available, it's probably the one you want to use.

Other than that, using it is a lot like using std::map, with the proviso that when/if you traverse the items in an std::map, they come out in the order specified by operator<, but for an unordered_map, the order is generally meaningless.

1.This will search XMLHelpers/XMLHelpers.psm1 in current folder

Import-Module (Resolve-Path('XMLHelpers'))

2.This will search XMLHelpers.psm1 in current folder

Import-Module (Resolve-Path('XMLHelpers.psm1'))

Using spinlocks on a single-core/single-CPU system makes usually no sense, since as long as the spinlock polling is blocking the only available CPU core, no other thread can run and since no other thread can run, the lock won't be unlocked either. IOW, a spinlock wastes only CPU time on those systems for no real benefit

This is wrong. There is no wastage of cpu cycles in using spinlocks on uni processor systems, because once a process takes a spin lock , preemption is disabled , so as such, there could be no one else spinning! It's just that using it doesn't make any sense! Hence, spinlocks on Uni systems are replaced by preempt_disable at compile time by the kernel!

Here's mine ; it gives you control over the 3 parameters that matter:

• the fade in speed
• the fade out speed
• the repeat speed

.

setInterval(function() {
    $('.blink').fadeIn(300).fadeOut(500);
}, 1000);

Slight changes over earlier version - tested on CHROME

function PrintElem(elem)
{
    var mywindow = window.open('', 'PRINT', 'height=400,width=600');

    mywindow.document.write('<html><head><title>' + document.title  + '</title>');
    mywindow.document.write('</head><body >');
    mywindow.document.write('<h1>' + document.title  + '</h1>');
    mywindow.document.write(document.getElementById(elem).innerHTML);
    mywindow.document.write('</body></html>');

    mywindow.document.close(); // necessary for IE >= 10
    mywindow.focus(); // necessary for IE >= 10*/

    mywindow.print();
    mywindow.close();

    return true;
}

This code is worked for me without setAutoResizeModes.

        TableColumnModel columnModel = jTable1.getColumnModel();
        columnModel.getColumn(1).setPreferredWidth(170);
        columnModel.getColumn(1).setMaxWidth(170);
        columnModel.getColumn(2).setPreferredWidth(150);
        columnModel.getColumn(2).setMaxWidth(150);
        columnModel.getColumn(3).setPreferredWidth(40);
        columnModel.getColumn(3).setMaxWidth(40);

Amazingly now org.json now lets you put a byte[] object directly into a json and it remains readable. you can even send the resulting object over a websocket and it will be readable on the other side. but i am not sure yet if the size of the resulting object is bigger or smaller than if you were converting your byte array to base64, it would certainly be neat if it was smaller.

It seems to be incredibly hard to measure how much space such a json object takes up in java. if your json consists merely of strings it is easily achievable by simply stringifying it but with a bytearray inside it i fear it is not as straightforward.

stringifying our json in java replaces my bytearray for a 10 character string that looks like an id. doing the same in node.js replaces our byte[] for an unquoted value reading <Buffered Array: f0 ff ff ...> the length of the latter indicates a size increase of ~300% as would be expected

You can use many ports together for each project,

  php artisan serve --port=8000

  php artisan serve --port=8001   

  php artisan serve --port=8002

  php artisan serve --port=8003

Setting just the width and float css properties would get a wrapping panel. The folowing example work just fine:

<div style="float:left; width: 250px">
Pellentesque feugiat tempor elit. Ut mollis lacinia quam. 
Sed pharetra, augue aliquam   ornare vestibulum, metus massa
laoreet tellus, eget iaculis lacus ipsum et diam. 
</div>

Maybe there are other styles in place that modify the appearance?

This is not dependent on the -- or ++ sign, but it depends on conditions you apply in the loop.

For example: Your loop is faster if the variable has a static value than if your loop check conditions every time, like the length of an array or other conditions.

But don't worry about this optimization, because this time its effect is measured in nanoseconds.

If it's still not working here's what may certainly be a solution: encode the mp4 with compression format H.264. If you encode it with format mpeg4 or divx or else it will not work on IE9 and may as well crash Google Chrome. To do that, I use Any Video Converter freeware. But it could be done with any good video tool out there.

I've been trying all solutions listed here and tried other workaround for days but the problem lied in the way I created my mp4. IE9 does not decode other format than H.264.

Hope this helps, Jimmy

It seems that you are asking multiple things. To answer them:

• Yes, it is ok to extract data from a string using regular expressions, that's what they're there for
• You get errors, which one and what shell tool do you use?

• You can extract the numbers by catching them in capturing parentheses:

  .*(\d+) rofl.*
  

  and using $1 to get the string out (.* is for "the rest before and after on the same line)

With sed as example, the idea becomes this to replace all strings in a file with only the matching number:

sed -e 's/.*(\d+) rofl.*/$1/g' inputFileName > outputFileName

or:

echo "12 BBQ ,45 rofl, 89 lol" | sed -e 's/.*(\d+) rofl.*/$1/g'

From here.

“Slug” is a newspaper term, but what it means here is the final bit of the URL. For example, a post with the title, “A bit about Django” would become, “bit-about-django” automatically (you can, of course, change it easily if you don’t like the auto-generated slug).

You should try this way. It will definitely work.

(function() {

var app = angular.module('myApp', []);

 app.controller('myController', ['$scope', function($scope) {

    $scope.myText = "Object Push inside ";

    $scope.arrayText = [

        ];

    $scope.addText = function() {
        $scope.arrayText.push(this.myText);
    }

 }]);

})();

In your case $scope.arrayText is an object. You should initialize as a array.

the solution is implementing anonymous class in this manner:

        import org.openqa.selenium.Point;
        import org.openqa.selenium.interactions.HasInputDevices;
        import org.openqa.selenium.interactions.Mouse;
        import org.openqa.selenium.interactions.internal.Coordinates;

        .....

        final Point image = page.findImage("C:\\Pictures\\marker.png") ;

        Mouse mouse = ((HasInputDevices) driver).getMouse();

        Coordinates imageCoordinates =  new Coordinates() {

              public Point onScreen() {
                throw new UnsupportedOperationException("Not supported yet.");
              }

              public Point inViewPort() {
                Response response = execute(DriverCommand.GET_ELEMENT_LOCATION_ONCE_SCROLLED_INTO_VIEW,
        ImmutableMap.of("id", getId()));

    @SuppressWarnings("unchecked")
    Map<String, Number> mapped = (Map<String, Number>) response.getValue();

    return new Point(mapped.get("x").intValue(), mapped.get("y").intValue());
              }

              public Point onPage() {
                return image;
              }

              public Object getAuxiliary() {
                // extract the selenium imageElement id (imageElement.toString() and parse out the "{sdafbsdkjfh}" format id) and return it
              }
            };

        mouse.mouseMove(imageCoordinates);

You should be able to convert your number to a Java Calendar, e.g.:

 Calendar.getInstance().setTimeInMillis(myDate);

From there, the comparison shouldn't be too hard.

You might also consider trying one of these approaches, since larger tables aren't exactly friendly on mobile even if it works:

http://elvery.net/demo/responsive-tables/

I'm partial to 'No More Tables' but that obviously depends on your application.

Tools > SDK Manager > SDK Tools > Show Package Details and remove all the old versions

Linux supports capabilities to support more fine-grained permissions than just "this application is run as root". One of those capabilities is CAP_NET_BIND_SERVICE which is about binding to a privileged port (<1024).

Unfortunately I don't know how to exploit that to run an application as non-root while still giving it CAP_NET_BIND_SERVICE (probably using setcap, but there's bound to be an existing solution for this).

example of textarea for disable the resize option

<textarea CLASS="foo"></textarea>

<style>
textarea.foo
{
resize:none;
}

</style>

Let's suppose you want to replace line 4 with the text "different". You can use AWK like so:

awk '{ if (NR == 4) print "different"; else print $0}' input_file.txt > output_file.txt

AWK considers the input to be "records" divided into "fields". By default, one line is one record. NR is the number of records seen. $0 represents the current complete record (while $1 is the first field from the record and so on; by default the fields are words from the line).

So, if the current line number is 4, print the string "different" but otherwise print the line unchanged.

In AWK, program code enclosed in { } runs once on each input record.

You need to quote the AWK program in single-quotes to keep the shell from trying to interpret things like the $0.

EDIT: A shorter and more elegant AWK program from @chepner in the comments below:

awk 'NR==4 {$0="different"} { print }' input_file.txt

Only for record (i.e. line) number 4, replace the whole record with the string "different". Then for every input record, print the record.

Clearly my AWK skills are rusty! Thank you, @chepner.

EDIT: and see also an even shorter version from @Dennis Williamson:

awk 'NR==4 {$0="different"} 1' input_file.txt

How this works is explained in the comments: the 1 always evaluates true, so the associated code block always runs. But there is no associated code block, which means AWK does its default action of just printing the whole line. AWK is designed to allow terse programs like this.

I am surprised that the connection string works for you, because it is missing a semi-colon. Set is only used with objects, so you would not say Set strNaam.

Set cn = CreateObject("ADODB.Connection")
With cn
 .Provider = "Microsoft.Jet.OLEDB.4.0"
  .ConnectionString = "Data Source=D:\test.xls " & _
  ";Extended Properties=""Excel 8.0;HDR=Yes;"""
.Open
End With
strQuery = "SELECT * FROM [Sheet1$E36:E38]"
Set rs = cn.Execute(strQuery)
Do While Not rs.EOF
  For i = 0 To rs.Fields.Count - 1
    Debug.Print rs.Fields(i).Name, rs.Fields(i).Value
    strNaam = rs.Fields(0).Value
  Next
  rs.MoveNext
Loop
rs.Close

There are other ways, depending on what you want to do, such as GetString (GetString Method Description).

Forward port of .live() for jQuery >= 1.9 Avoids refactoring JS dependencies on .live() Uses optimized DOM selector context

/** 
 * Forward port jQuery.live()
 * Wrapper for newer jQuery.on()
 * Uses optimized selector context 
 * Only add if live() not already existing.
*/
if (typeof jQuery.fn.live == 'undefined' || !(jQuery.isFunction(jQuery.fn.live))) {
  jQuery.fn.extend({
      live: function (event, callback) {
         if (this.selector) {
              jQuery(document).on(event, this.selector, callback);
          }
      }
  });
}

I Guess this will help you fix your problem please check under given Function : trims text to a space then adds ellipses if desired

• @param string $input text to trim

  • @param int $length in characters to trim to
  • @param bool $ellipses if ellipses (...) are to be added
  • @param bool $strip_html if html tags are to be stripped

  • @return string

    function trim_text($input, $length, $ellipses = true, $strip_html = true) {
    //strip tags, if desired
    if ($strip_html) {
        $input = strip_tags($input);
    }//no need to trim, already shorter than trim length
    if (strlen($input) <= $length) {
        return $input;
    }
    
    //find last space within length
    $last_space = strrpos(substr($input, 0, $length), ' ');
    $trimmed_text = substr($input, 0, $last_space);
    
    //add ellipses (...)
    if ($ellipses) {
        $trimmed_text .= '...';
    }
    
    return $trimmed_text;}
    

I have used the statement below on debian 10

apt-get install iputils-ping

Set both the outline and the box-shadow properties of the button to none and make them important.

input[type="button"] {
    outline: none !important;
    box-shadow: none !important;
} 

The reason for setting the values to important is that, if you are using other CSS libraries or frameworks like Bootstrap, it might get overridden.

easiest way to clear form

<form #myForm="ngForm" (submit)="addPost();"> ... </form>

then in .ts file you need to access local variable of template i.e

@ViewChild('myForm') mytemplateForm : ngForm; //import { NgForm } from '@angular/forms';

for resetting values and state(pristine,touched..) do the following

addPost(){
this.newPost = {
    title: this.mytemplateForm.value.title,
    body: this.mytemplateForm.value.body
}
this._postService.addPost(this.newPost);
this.mytemplateForm.reset(); }

This is most cleanest way to clear the form

I am running PHP version 5.4 on shared hosting and both of these both successfully return the same results:

php_uname('n');

gethostname();

'always|withText' will work if there is sufficient room, otherwise it will only place icon. You can test it on your phone with rotation.

<item android:id="@id/menu_item"
android:title="text"
android:icon="@drawable/drawable_resource_name"
android:showAsAction="always|withText" />

In swift 4

let Totalname = "10.0" //Now it is in string

let floatVal  = (Totalname as NSString).floatValue //Now converted to float

I came to this post - but I just wanted to do the conversion by batch and quick without the usage of any parameters (due to several files with different sizes).

rsvg drawing.svg drawing.png

For me the requirements were probably a bit easier than for the original author. (Wanted to use SVGs in MS PowerPoint, but it doesn't allow)

In Java:

Transform your query in TypedQuery if it's a CriteriaQuery (javax.persistence).

Then:

query.unwrap(org.hibernate.Query.class).getQueryString();

SELECT * 
FROM 
    PersonAddress a, 
    Person b,
    PersonAdmin c
WHERE a.addressid LIKE '97%' 
    AND b.lastname LIKE 'test%'
    AND b.genderid IS NOT NULL
    AND a.partyid = c.partyid 
    AND b.partyid = c.partyid;

private static String getCurrentDateIso()
{
    // Returns the current date with the same format as Javascript's new Date().toJSON(), ISO 8601
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
    dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
    return dateFormat.format(new Date());
}

KEYPRESS (enter key)
Click inside the snippet and press Enter key.

Vanilla

document.addEventListener("keypress", function(event) {
  if (event.keyCode == 13) {
    alert('hi.');
  }
});

Vanilla shorthand (ES6)

this.addEventListener('keypress', event => {
  if (event.keyCode == 13) {
    alert('hi.')
  }
})

jQuery

$(this).on('keypress', function(event) {
  if (event.keyCode == 13) {
    alert('hi.')
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

jQuery classic

$(this).keypress(function(event) {
  if (event.keyCode == 13) {
    alert('hi.')
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

jQuery shorthand (ES6)

$(this).keypress((e) => {
  if (e.keyCode == 13)
    alert('hi.')
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

Even shorter (ES6)

$(this).keypress(e=>
  e.which==13?
  alert`hi.`:null
)

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

Due some requests, here an explanation:

I rewrote this answer as things have become deprecated over time so I updated it.

I used this to focus on the window scope inside the results when document is ready and for the sake of brevity but it's not necessary.

Deprecated:
The .which and .keyCode methods are actually considered deprecated so I would recommend .code but I personally still use keyCode as the performance is much faster and only that counts for me. The jQuery classic version .keypress() is not officially deprecated as some people say but they are no more preferred like .on('keypress') as it has a lot more functionality(live state, multiple handlers, etc.). The 'keypress' event in the Vanilla version is also deprecated. People should prefer beforeinput or keydown today. (Note: It has nothing to do with jQuery's events, they are called the same but execute differently.)

All examples above are no biggies regarding deprecated or not. Consoles or any browser should be able to notify you with that if this happens. And if this ever does in future, just fix it.

Readablity:
Despite the ease making it too short and snippy isn't always good either. If you work in a team, your code must be readable and detailed. I recommend the jQuery version .on('keypress'), this is the way to go and understandable by most people.

Performance:
I always follow my phrase Performance over Effectiveness as anything can be more effective if there is the option but it just should function and execute only what I want, the faster the better. This is why I prefer .keyCode even if it's considered deprecated(in most cases). It's all up to you though.

Performance Test

If you want to use only one SQL query to delete all tables you can use this:

EXEC sp_MSforeachtable @command1 = "DROP TABLE ?"

This is a hidden Stored Procedure in sql server, and will be executed for each table in the database you're connected.

Note: You may need to execute the query a few times to delete all tables due to dependencies.

Note2: To avoid the first note, before running the query, first check if there foreign keys relations to any table. If there are then just disable foreign key constraint by running the query bellow:

EXEC sp_msforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all"

Personally I'd json_encode the array (taking into account any escaping etc needed) and bung the entire lot into an appropriately sized text/blob field.

It makes it very easy to store "unstructured" data but a real PITA to search/index on with any grace.

A simple json_decode will "explode" the data back into an array for you.

Although the accepted answer here is technically correct, there seems to be some confusion amongst users based on the comments. When working with a ViewBag in a .cshtml file, you must use @Html.Raw otherwise your data, after being unescaped by the ConfigurationManager, will become re-escaped once again. Use Html.Raw() to prevent this from occurring.

Use MouseDown event

if(e.Button == MouseButton.Right)

Just do a

SELECT COUNT(*) FROM table;

You can specify conditions with a Where after that

SELECT COUNT(*) FROM table WHERE eye_color='brown';

The Visual Studio debugger comes with four standard visualizers. These are the text, HTML, and XML visualizers, all of which work on string objects, and the dataset visualizer, which works for DataSet, DataView, and DataTable objects.

To use it, break into your code, mouse over your DataSet, expand the quick watch, view the Tables, expand that, then view Table[0] (for example). You will see something like {Table1} in the quick watch, but notice that there is also a magnifying glass icon. Click on that icon and your DataTable will open up in a grid view.

Really depends on what you're trying to do. Types are documentation in typescript, so you want to show intention about how this thing is supposed to be used when you're creating the type.

Option 1: If Users might have some but not all of the attributes during their lifetime

Make all attributes optional

type User = {
  attr0?: number
  attr1?: string
}

Option 2: If variables containing Users may begin null

type User = {
...
}
let u1: User = null;

Though, really, here if the point is to declare the User object before it can be known what will be assigned to it, you probably want to do let u1:User without any assignment.

Option 3: What you probably want

Really, the premise of typescript is to make sure that you are conforming to the mental model you outline in types in order to avoid making mistakes. If you want to add things to an object one-by-one, this is a habit that TypeScript is trying to get you not to do.

More likely, you want to make some local variables, then assign to the User-containing variable when it's ready to be a full-on User. That way you'll never be left with a partially-formed User. Those things are gross.

let attr1: number = ...
let attr2: string = ...
let user1: User = {
  attr1: attr1,
  attr2: attr2
}

Context provides information about the Actvity or Application to newly created components.

Relevant Context should be provided to newly created components (whether application context or activity context)

Since Activity is a subclass of Context, one can use this to get that activity's context

int min and max values

Int -2,147,483,648 / 2,147,483,647 Int 64 -9,223,372,036,854,775,808 / 9,223,372,036,854,775,807

i guess you could set a to equal 9,223,372,036,854,775,807 but it would need to be an int64

if you always want a to be grater that b why do you need to check it? just set it to be true always

With Rails 4 it's easy:

 Foo.includes(:bar).where.not(bars: {id: nil})

See also: http://guides.rubyonrails.org/active_record_querying.html#not-conditions

Not with pure CSS. The closest equivalent is this:

.class1, .class2 {
    some stuff
}

.class2 {
    some more stuff
}

I blogged about how to consume a WCF service using jQuery:

http://yoavniran.wordpress.com/2009/08/02/creating-a-webservice-proxy-with-jquery/

The post shows how to create a service proxy straight up in javascript.

To capture div as PDF you can use https://grabz.it solution. It's got a JavaScript API which is easy and flexible and will allow you to capture the contents of a single HTML element such as a div or a span

In order to implement it you will need to first get an app key and secret and download the (free) SDK.

And now an example.

Let's say you have the HTML:

<div id="features">
    <h4>Acme Camera</h4>
    <label>Price</label>$399<br />
    <label>Rating</label>4.5 out of 5
</div>
<p>Cras ut velit sed purus porttitor aliquam. Nulla tristique magna ac libero tempor, ac vestibulum felisvulput ate. Nam ut velit eget
risus porttitor tristique at ac diam. Sed nisi risus, rutrum a metus suscipit, euismod tristique nulla. Etiam venenatis rutrum risus at
blandit. In hac habitasse platea dictumst. Suspendisse potenti. Phasellus eget vehicula felis.</p>

To capture what is under the features id you will need to:

//add the sdk
<script type="text/javascript" src="grabzit.min.js"></script>
<script type="text/javascript">
//login with your key and secret. 
GrabzIt("KEY", "SECRET").ConvertURL("http://www.example.com/my-page.html",
{"target": "#features", "format": "pdf"}).Create();
</script>

Please note the target: #feature. #feature is you CSS selector, like in the previous example. Now, when the page is loaded an image screenshot will now be created in the same location as the script tag, which will contain all of the contents of the features div and nothing else.

The are other configuration and customization you can do to the div-screenshot mechanism, please check them out here

git read-tree -um @ $commit_to_revert_to

will do it. It's "git checkout" but without updating HEAD.

You can achieve the same effect with

git checkout $commit_to_revert_to
git reset --soft @{1}

if you prefer stringing convenience commands together.

These leave you with your worktree and index in the desired state, you can just git commit to finish.

You can also use a conditional lookup using .loc as seen here:

df.loc[df[<some_column_name>] == <condition>, [<another_column_name>]] = <value_to_add>

where <some_column_name is the column you want to check the <condition> variable against and <another_column_name> is the column you want to add to (can be a new column or one that already exists). <value_to_add> is the value you want to add to that column/row.

This example doesn't work precisely with the question at hand, but it might be useful for someone wants to add a specific value based on a condition.

Played with Boo's approach, however don't like the fact that user got kicked off only once another digest is run, which means user stays logged in until he tries to do something within the page, and then immediatelly kicked off.

I am trying to force the logoff using interval which checks every minute if last action time was more than 30 minutes ago. I hooked it on $routeChangeStart, but could be also hooked on $rootScope.$watch as in Boo's example.

app.run(function($rootScope, $location, $interval) {

    var lastDigestRun = Date.now();
    var idleCheck = $interval(function() {
        var now = Date.now();            
        if (now - lastDigestRun > 30*60*1000) {
           // logout
        }
    }, 60*1000);

    $rootScope.$on('$routeChangeStart', function(evt) {
        lastDigestRun = Date.now();  
    });
});

Perl one-liner:

perl -e 'local $/; print unpack "H*", <>' file

Why not this way:

1. In a class module »myClass« use Public Sub Init(myArguments) instead of Private Sub Class_Initialize()
2. Instancing: Dim myInstance As New myClass: myInstance.Init myArguments

Using only "native" Windows utilities, try the following, where "516" is the process ID that you want the image name for:

for /f "delims=," %a in ( 'tasklist /fi "PID eq 516" /nh /fo:csv' ) do ( echo %~a )
for /f %a in ( 'tasklist /fi "PID eq 516" ^| findstr "516"' ) do ( echo %a )

Or you could use wmic (the Windows Management Instrumentation Command-line tool) and get the full path to the executable:

wmic process where processId=516 get name
wmic process where processId=516 get ExecutablePath

Or you could download Microsoft PsTools, or specifically download just the pslist utility, and use PsList:

for /f %a in ( 'pslist 516 ^| findstr "516"' ) do ( echo %a )

There are many links that lets you know how to handle post values from checkboxes in php. Look at this link: http://www.html-form-guide.com/php-form/php-form-checkbox.html

Single check box

HTML code:

<form action="checkbox-form.php" method="post">
    Do you need wheelchair access?
    <input type="checkbox" name="formWheelchair" value="Yes" />
    <input type="submit" name="formSubmit" value="Submit" />
</form>

PHP Code:

<?php

if (isset($_POST['formWheelchair']) && $_POST['formWheelchair'] == 'Yes') 
{
    echo "Need wheelchair access.";
}
else
{
    echo "Do not Need wheelchair access.";
}    

?>

Check box group

<form action="checkbox-form.php" method="post">
    Which buildings do you want access to?<br />
    <input type="checkbox" name="formDoor[]" value="A" />Acorn Building<br />
    <input type="checkbox" name="formDoor[]" value="B" />Brown Hall<br />
    <input type="checkbox" name="formDoor[]" value="C" />Carnegie Complex<br />
    <input type="checkbox" name="formDoor[]" value="D" />Drake Commons<br />
    <input type="checkbox" name="formDoor[]" value="E" />Elliot House

    <input type="submit" name="formSubmit" value="Submit" />
 /form>

<?php
  $aDoor = $_POST['formDoor'];
  if(empty($aDoor)) 
  {
    echo("You didn't select any buildings.");
  } 
  else
  {
    $N = count($aDoor);

    echo("You selected $N door(s): ");
    for($i=0; $i < $N; $i++)
    {
      echo($aDoor[$i] . " ");
    }
  }
?>

Just to give you an another option, you could use https://sourceforge.net/projects/dd2vmdk/ as well. dd2vmdk is a *nix-based program that allows you to mount raw disk images (created by dd, dcfldd, dc3dd, ftk imager, etc) by taking the raw image, analyzing the master boot record (physical sector 0), and getting specific information that is need to create a vmdk file.

Personally, imo Qemu and the Zapotek's raw2vmdk tools are the best overall options to convert dd to vmdks.

Disclosure: I am the author of this project.

Below worked for me.

> 1. npm uninstall @angular-devkit/build-angular 

> 2. npm install @angular-devkit/[email protected]

if we use

AVOID: npm audit fix -f

it may create problem, so dont use it.

For Excel 2010 it should be UTF-8. Instruction by MS :
http://msdn.microsoft.com/en-us/library/bb507946:

"The basic document structure of a SpreadsheetML document consists of the Sheets and Sheet elements, which reference the worksheets in the Workbook. A separate XML file is created for each Worksheet. For example, the SpreadsheetML for a workbook that has two worksheets name MySheet1 and MySheet2 is located in the Workbook.xml file and is shown in the following code example.

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
<workbook xmlns=http://schemas.openxmlformats.org/spreadsheetml/2006/main xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
    <sheets>
        <sheet name="MySheet1" sheetId="1" r:id="rId1" /> 
        <sheet name="MySheet2" sheetId="2" r:id="rId2" /> 
    </sheets>
</workbook>

The worksheet XML files contain one or more block level elements such as SheetData. sheetData represents the cell table and contains one or more Row elements. A row contains one or more Cell elements. Each cell contains a CellValue element that represents the value of the cell. For example, the SpreadsheetML for the first worksheet in a workbook, that only has the value 100 in cell A1, is located in the Sheet1.xml file and is shown in the following code example.

<?xml version="1.0" encoding="UTF-8" ?> 
<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
    <sheetData>
        <row r="1">
            <c r="A1">
                <v>100</v> 
            </c>
        </row>
    </sheetData>
</worksheet>

"

Detection of cell encodings:

https://metacpan.org/pod/Spreadsheet::ParseExcel::Cell

http://forums.asp.net/t/1608228.aspx/1

The Sean's solution didn't work for me initially (Android 4.2.2). I had to add a dummy activity to the same Android project and run the activity manually on the device at least once. Then the Sean's solution started to work and the BroadcastReceiver was notified after subsequent reboots.

Get the id of the div whose content you want to change then assign the text as below:

  var myDiv = document.getElementById("divId");
  myDiv.innerHTML = "Content To Show";

You wrote log_dir='/Graph' did you mean ./Graph instead? You sent it to /home/user/Graph at the moment.

In golang's wiki it show some tricks for slice, including delete an element from slice.

Link: enter link description here

For example a is the slice which you want to delete the number i element.

a = append(a[:i], a[i+1:]...)

OR

a = a[:i+copy(a[i:], a[i+1:])]

Use Activity.getWindow() to get the window of your activity; use Window.addFlags() to add whichever of the following flags in WindowManager.LayoutParams that you desire:

• FLAG_DISMISS_KEYGUARD

• FLAG_SHOW_WHEN_LOCKED

• FLAG_TURN_SCREEN_ON

If you want a cryptographically strong random number generator (also thread safe) without using a third party API, you can use SecureRandom.

Java 6 & 7:

SecureRandom random = new SecureRandom();
byte[] bytes = new byte[20];
random.nextBytes(bytes);

Java 8 (even more secure):

byte[] bytes = new byte[20];
SecureRandom.getInstanceStrong().nextBytes(bytes);

I use both PuTTY and Bitvise SSH Client. PuTTY handles screen sessions better, but Bitvise automatically opens up a SFTP window so you can transfer files just like you would with an FTP client.

To simulate a dropped connection try

connection.destroy();

More information here: https://github.com/felixge/node-mysql/blob/master/Readme.md#terminating-connections

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
   

Another way:

export default class Archive extends React.Component { 

  saySomething = (something) => {
    console.log(something);
  }

  handleClick = (e) => {
    this.saySomething("element clicked");
  }

  componentDidMount() {
    this.saySomething("component did mount");
  }

  render() {
    return <button onClick={this.handleClick} value="Click me" />;
  }
}

In this format you don't need to use bind

It seems to me that a slight adaptation of TheVillageIdiot's answer would be cleaner:

$('#element').bind('click', function(e) {
  if (e.button == 2) {
    alert("Right click");
  }
  else {
    alert("Some other click");
  }
}

EDIT: JQuery provides an e.which attribute, returning 1, 2, 3 for left, middle, and right click respectively. So you could also use if (e.which == 3) { alert("right click"); }

See also: answers to "Triggering onclick event using middle click"

What I am wondering is if there is any strange way to make this check even faster, maybe exploiting some strange method in Regexp or some weird construct.

Regexp engines vary in how they implement searches, but, in general, anchor your patterns for speed, and avoid greedy matches, especially when searching long strings.

The best thing to do, until you're familiar with how a particular engine works, is to do benchmarks and add/remove anchors, try limiting searches, use wildcards vs. explicit matches, etc.

The Fruity gem is very useful for quickly benchmarking things, because it's smart. Ruby's built-in Benchmark code is also useful, though you can write tests that fool you by not being careful.

I've used both in many answers here on Stack Overflow, so you can search through my answers and will see lots of little tricks and results to give you ideas of how to write faster code.

The biggest thing to remember is, it's bad to prematurely optimize your code before you know where the slowdowns occur.

If you removed the branch and forgot it's commit id you can do this command:

git log --graph --decorate $(git rev-list -g --all)

After this you'll be able to see all commits. Then you can do git checkout to this id and under this commit create a new branch.

& is the Bash equivalent for ; ( run commands) and && is the Bash equivalent of && (run commands only when the previous has not caused an error).

I'm using a modified version of @Brook's answer and is working fine even for elements that needs the page to be scrolled.

public void TakeScreenshot(string fileNameWithoutExtension, IWebElement element)
{
    // Scroll to the element if necessary
    var actions = new Actions(_driver);
    actions.MoveToElement(element);
    actions.Perform();
    // Get the element position (scroll-aware)
    var locationWhenScrolled = ((RemoteWebElement) element).LocationOnScreenOnceScrolledIntoView;
    var fileName = fileNameWithoutExtension + ".png";
    var byteArray = ((ITakesScreenshot) _driver).GetScreenshot().AsByteArray;
    using (var screenshot = new System.Drawing.Bitmap(new System.IO.MemoryStream(byteArray)))
    {
        var location = locationWhenScrolled;
        // Fix location if necessary to avoid OutOfMemory Exception
        if (location.X + element.Size.Width > screenshot.Width)
        {
            location.X = screenshot.Width - element.Size.Width;
        }
        if (location.Y + element.Size.Height > screenshot.Height)
        {
            location.Y = screenshot.Height - element.Size.Height;
        }
        // Crop the screenshot
        var croppedImage = new System.Drawing.Rectangle(location.X, location.Y, element.Size.Width, element.Size.Height);
        using (var clone = screenshot.Clone(croppedImage, screenshot.PixelFormat))
        {
            clone.Save(fileName, ImageFormat.Png);
        }
    }
}

The two ifs were necessary (at least for the chrome driver) because the size of the crop exceeded in 1 pixel the screenshot size, when scrolling was needed.

Depending on your exact needs, you may consider using BitTorrent Sync. Create a shared folder on your home PC and your work PC. Edit the files on your home PC (using Sublime or whatever you like), and they will sync automatically when you save. BitTorrent Sync does not rely on a central server storing the files (a la Dropbox and the like), so you should in theory be clear of any issues due to a third party storing sensitive info.

If you want a formula to do it then:

=IF(ISNUMBER(SEARCH("*texts are *",A1)),LEFT(A1,FIND("texts are ",A1) + 9) & "WORD",A1)

This will do it. Change `"WORD" To the word you want.

The Timer function in VBA gives you the number of seconds elapsed since midnight, to 1/100 of a second.

Dim t as single
t = Timer
'code
MsgBox Timer - t

You can not specify the password from the command line but you can do either using ssh keys or using sshpass as suggested by John C. or using a expect script.

To use sshpass, you need to install it first. Then

sshpass -f <(printf '%s\n' your_password) ssh user@hostname

instead of using sshpass -p your_password. As mentioned by Charles Duffy in the comments, it is safer to supply the password from a file or from a variable instead of from command line.

BTW, a little explanation for the <(command) syntax. The shell executes the command inside the parentheses and replaces the whole thing with a file descriptor, which is connected to the command's stdout. You can find more from this answer https://unix.stackexchange.com/questions/156084/why-does-process-substitution-result-in-a-file-called-dev-fd-63-which-is-a-pipe

FLAG_ACTIVITY_REORDER_TO_FRONT: If set in an Intent passed to Context.startActivity(), this flag will cause the launched activity to be brought to the front of its task's history stack if it is already running.

Intent i = new Intent(context, AActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);

From what I've seen of this the following is true for Firefox and Chrome;

1) If you have a HTML page open from a remote host then file:// links will not work i.e. Your address bar reads http://someserver.domain and the page contains a link such as <a href="file:///S:/sharedfile.txt">

2) If you have a HTML page open from your local host then file:// links will work i.e. your address bar reads file:///C:/mydir/index.html and the page contains a link such as <a href="file:///S:/sharedfile.txt">

For Internet Explorer point 1) does not hold true. A file on your local host can be accessed using the file:// link syntax from a webpage on a remote host. This is considered a security flaw in IE^{(By who? References?)} (and it's there in IE8 too) because a remote host can access files on your local computer without your knowledge .... admittedly they have to get lucky with the filename but there are plenty of commonly named files there with the potential to contain personal/private information.

You could also use JDBC to achieve this. Let's create a sample csv file.

write.table(x=mtcars, file="mtcars.csv", sep=",", row.names=F, col.names=T) # create example csv file

Download and save the the CSV JDBC driver from this link: http://sourceforge.net/projects/csvjdbc/files/latest/download

> library(RJDBC)

> path.to.jdbc.driver <- "jdbc//csvjdbc-1.0-18.jar"
> drv <- JDBC("org.relique.jdbc.csv.CsvDriver", path.to.jdbc.driver)
> conn <- dbConnect(drv, sprintf("jdbc:relique:csv:%s", getwd()))

> head(dbGetQuery(conn, "select * from mtcars"), 3)
   mpg cyl disp  hp drat    wt  qsec vs am gear carb
1   21   6  160 110  3.9  2.62 16.46  0  1    4    4
2   21   6  160 110  3.9 2.875 17.02  0  1    4    4
3 22.8   4  108  93 3.85  2.32 18.61  1  1    4    1

> head(dbGetQuery(conn, "select mpg, gear from mtcars"), 3)
   MPG GEAR
1   21    4
2   21    4
3 22.8    4

It runs successfully the first time, but if I run it again, I keep getting a System.OutOfMemoryException. What are some reasons this could be happening?

Regardless of what the others have said, the error has nothing to do with forgetting to dispose your DBCommand or DBConnection, and you will not fix your error by disposing of either of them.

The error has everything to do with your dataset which contains nearly 600,000 rows of data. Apparently your dataset consumes more than 50% of the available memory on your machine. Clearly, you'll run out of memory when you return another dataset of the same size before the first one has been garbage collected. Simple as that.

You can remedy this problem in a few ways:

• Consider returning fewer records. I personally can't imagine a time when returning 600K records has ever been useful to a user. To minimize the records returned, try:

  • Limiting your query to the first 1000 records. If there are more than 1000 results returned from the query, inform the user to narrow their search results.

  • If your users really insist on seeing that much data at once, try paging the data. Remember: Google never shows you all 22 bajillion results of a search at once, it shows you 20 or so records at a time. Google probably doesn't hold all 22 bajillion results in memory at once, it probably finds its more memory efficient to requery its database to generate a new page.

• If you just need to iterate through the data and you don't need random access, try returning a datareader instead. A datareader only loads one record into memory at a time.

If none of those are an option, then you need to force .NET to free up the memory used by the dataset before calling your method using one of these methods:

• Remove all references to your old dataset. Anything holding on to a refenence of your dataset will prevent it from being reclaimed by memory.

• If you can't null all the references to your dataset, clear all of the rows from the dataset and any objects bound to those rows instead. This removes references to the datarows and allows them to be eaten by the garbage collector.

I don't believe you'll need to call GC.Collect() to force a gen cycle. Not only is it generally a bad idea to call GC.Collect(), because sufficient memory pressure will cause .NET invoke the garbage collector on its own.

Note: calling Dispose on your dataset does not free any memory, nor does it invoke the garbage collector, nor does it remove a reference to your dataset. Dispose is used to clean up unmanaged resources, but the DataSet does not have any unmanaged resources. It only implements IDispoable because it inherents from MarshalByValueComponent, so the Dispose method on the dataset is pretty much useless.

I know this is a very old question but there is one more method to do this. Below code compiles but I haven't tried it. You can write some C code and use JNI (Java Native Interface) to get MAC address. Here is the example main activity code:

package com.example.getmymac;

import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class GetMyMacActivity extends AppCompatActivity {
    static { // here we are importing native library.
        // name of the library is libnet-utils.so, in cmake and java code
        // we just use name "net-utils".
        System.loadLibrary("net-utils");
    }

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_screen);

        // some debug text and a TextView.
        Log.d(NetUtilsActivity.class.getSimpleName(), "Starting app...");
        TextView text = findViewById(R.id.sample_text);

        // the get_mac_addr native function, implemented in C code.
        byte[] macArr = get_mac_addr(null);
        // since it is a byte array, we format it and convert to string.
        String val = String.format("%02x:%02x:%02x:%02x:%02x:%02x",
                macArr[0], macArr[1], macArr[2],
                macArr[3], macArr[4], macArr[5]);
        // print it to log and TextView.
        Log.d(NetUtilsActivity.class.getSimpleName(), val);
        text.setText(val);
    }

    // here is the prototype of the native function.
    // use native keyword to indicate it is a native function,
    // implemented in C code.
    private native byte[] get_mac_addr(String interface_name);
}

And the layout file, main_screen.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/sample_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/app_name"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

Manifest file, I didn't know what permissions to add so I added some.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.getmymac">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".GetMyMacActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
</manifest>

C implementation of get_mac_addr function.

/* length of array that MAC address is stored. */
#define MAC_ARR_LEN 6

#define BUF_SIZE 256

#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <unistd.h>

#define ERROR_IOCTL 1
#define ERROR_SOCKT 2

static jboolean
cstr_eq_jstr(JNIEnv *env, const char *cstr, jstring jstr) {
    /* see [this](https://stackoverflow.com/a/38204842) */

    jstring cstr_as_jstr = (*env)->NewStringUTF(env, cstr);
    jclass cls = (*env)->GetObjectClass(env, jstr);
    jmethodID method_id = (*env)->GetMethodID(env, cls, "equals", "(Ljava/lang/Object;)Z");
    jboolean equal = (*env)->CallBooleanMethod(env, jstr, method_id, cstr_as_jstr);
    return equal;
}

static void
get_mac_by_ifname(jchar *ifname, JNIEnv *env, jbyteArray arr, int *error) {
    /* see [this](https://stackoverflow.com/a/1779758) */

    struct ifreq ir;
    struct ifconf ic;
    char buf[BUF_SIZE];
    int ret = 0, sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);

    if (sock == -1) {
        *error = ERROR_SOCKT;
        return;
    }

    ic.ifc_len = BUF_SIZE;
    ic.ifc_buf = buf;

    ret = ioctl(sock, SIOCGIFCONF, &ic);
    if (ret) {
        *error = ERROR_IOCTL;
        goto err_cleanup;
    }

    struct ifreq *it = ic.ifc_req; /* iterator */
    struct ifreq *end = it + (ic.ifc_len / sizeof(struct ifreq));

    int found = 0; /* found interface named `ifname' */

    /* while we find an interface named `ifname' or arrive end */
    while (it < end && found == 0) {
        strcpy(ir.ifr_name, it->ifr_name);
        ret = ioctl(sock, SIOCGIFFLAGS, &ir);
        if (ret == 0) {
            if (!(ir.ifr_flags & IFF_LOOPBACK)) {
                ret = ioctl(sock, SIOCGIFHWADDR, &ir);
                if (ret) {
                    *error = ERROR_IOCTL;
                    goto err_cleanup;
                }

                if (ifname != NULL) {
                    if (cstr_eq_jstr(env, ir.ifr_name, ifname)) {
                        found = 1;
                    }
                }
            }
        } else {
            *error = ERROR_IOCTL;
            goto err_cleanup;
        }
        ++it;
    }

    /* copy the MAC address to byte array */
    (*env)->SetByteArrayRegion(env, arr, 0, 6, ir.ifr_hwaddr.sa_data);
    /* cleanup, close the socket connection */
    err_cleanup: close(sock);
}

JNIEXPORT jbyteArray JNICALL
Java_com_example_getmymac_GetMyMacActivity_get_1mac_1addr(JNIEnv *env, jobject thiz,
                                                          jstring interface_name) {
    /* first, allocate space for the MAC address. */
    jbyteArray mac_addr = (*env)->NewByteArray(env, MAC_ARR_LEN);
    int error = 0;

    /* then just call `get_mac_by_ifname' function */
    get_mac_by_ifname(interface_name, env, mac_addr, &error);

    return mac_addr;
}

And finally, CMakeLists.txt file

cmake_minimum_required(VERSION 3.4.1)
add_library(net-utils SHARED src/main/cpp/net-utils.c)
target_link_libraries(net-utils android log)

Let's say you have a blog with articles like this:

<div class="article"> ... </div>

Just adding this to the CSS worked for me:

@media print {
  .article { page-break-after: always; }
}

(tested and working on Chrome 69 and Firefox 62).

Reference:

• https://www.w3schools.com/cssref/pr_print_pageba.asp

• https://developer.mozilla.org/en-US/docs/Web/CSS/page-break-after ; important note: here it's said This property has been replaced by the break-after property. but it didn't work for me with break-after. Also the MDN doc about break-after doesn't seem to be specific for page-breaks, so I prefer keeping the (working) page-break-after: always;.