Programs & Examples On #Materialized

How to refresh materialized view in oracle

If you're working with SQL Developer, you have to put the dbms_view in lowercase. The rest compiled fine for me although I haven't called the procedure from code yet.

CREATE OR REPLACE PROCEDURE "MAT_VIEW_FOO_TBL" AS 
BEGIN
  dbms_mview.refresh('v_materialized_foo_tbl');
END;

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

Have you tried it without the ANSI join ?

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

The cast to value type 'Int32' failed because the materialized value is null

I was also facing the same problem and solved through making column as nullable using "?" operator.

Sequnce = db.mstquestionbanks.Where(x => x.IsDeleted == false && x.OrignalFormID == OriginalFormIDint).Select(x=><b>(int?)x.Sequence</b>).Max().ToString();

Sometimes null is returned.

What are the options for storing hierarchical data in a relational database?

If your database supports arrays, you can also implement a lineage column or materialized path as an array of parent ids.

Specifically with Postgres you can then use the set operators to query the hierarchy, and get excellent performance with GIN indices. This makes finding parents, children, and depth pretty trivial in a single query. Updates are pretty manageable as well.

I have a full write up of using arrays for materialized paths if you're curious.

How to create materialized views in SQL Server?

Although purely from engineering perspective, indexed views sound like something everybody could use to improve performance but the real life scenario is very different. I have been unsuccessful is using indexed views where I most need them because of too many restrictions on what can be indexed and what cannot.

If you have outer joins in the views, they cannot be used. Also, common table expressions are not allowed... In fact if you have any ordering in subselects or derived tables (such as with partition by clause), you are out of luck too.

That leaves only very simple scenarios to be utilizing indexed views, something in my opinion can be optimized by creating proper indexes on underlying tables anyway.

I will be thrilled to hear some real life scenarios where people have actually used indexed views to their benefit and could not have done without them

proper hibernate annotation for byte[]

I have finally got this working. It expands on the solution from A. Garcia, however, since the problem lies in the hibernate type MaterializedBlob type just mapping Blob > bytea is not sufficient, we need a replacement for MaterializedBlobType which works with hibernates broken blob support. This implementation only works with bytea, but maybe the guy from the JIRA issue who wanted OID could contribute an OID implementation.

Sadly replacing these types at runtime is a pain, since they should be part of the Dialect. If only this JIRA enhanement gets into 3.6 it would be possible.

public class PostgresqlMateralizedBlobType extends AbstractSingleColumnStandardBasicType<byte[]> {
 public static final PostgresqlMateralizedBlobType INSTANCE = new PostgresqlMateralizedBlobType();

 public PostgresqlMateralizedBlobType() {
  super( PostgresqlBlobTypeDescriptor.INSTANCE, PrimitiveByteArrayTypeDescriptor.INSTANCE );
 }

  public String getName() {
   return "materialized_blob";
  }
}

Much of this could probably be static (does getBinder() really need a new instance?), but I don't really understand the hibernate internal so this is mostly copy + paste + modify.

public class PostgresqlBlobTypeDescriptor extends BlobTypeDescriptor implements SqlTypeDescriptor {
  public static final BlobTypeDescriptor INSTANCE = new PostgresqlBlobTypeDescriptor();

  public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
   return new PostgresqlBlobBinder<X>(javaTypeDescriptor, this);
  }
  public <X> ValueExtractor<X> getExtractor(final JavaTypeDescriptor<X> javaTypeDescriptor) {
   return new BasicExtractor<X>( javaTypeDescriptor, this ) {
    protected X doExtract(ResultSet rs, String name, WrapperOptions options) throws SQLException { 
      return (X)rs.getBytes(name);
    }
   };
  }
}

public class PostgresqlBlobBinder<J> implements ValueBinder<J> {
 private final JavaTypeDescriptor<J> javaDescriptor;
 private final SqlTypeDescriptor sqlDescriptor;

 public PostgresqlBlobBinder(JavaTypeDescriptor<J> javaDescriptor, SqlTypeDescriptor sqlDescriptor) { 
  this.javaDescriptor = javaDescriptor; this.sqlDescriptor = sqlDescriptor;
 }  
 ...
 public final void bind(PreparedStatement st, J value, int index, WrapperOptions options) 
 throws SQLException {
  st.setBytes(index, (byte[])value);
 }
}

What is the difference between Views and Materialized Views in Oracle?

A view uses a query to pull data from the underlying tables.

A materialized view is a table on disk that contains the result set of a query.

Materialized views are primarily used to increase application performance when it isn't feasible or desirable to use a standard view with indexes applied to it. Materialized views can be updated on a regular basis either through triggers or by using the ON COMMIT REFRESH option. This does require a few extra permissions, but it's nothing complex. ON COMMIT REFRESH has been in place since at least Oracle 10.

store return json value in input hidden field

It looks like the return value is in an array? That's somewhat strange... and also be aware that certain browsers will allow that to be parsed from a cross-domain request (which isn't true when you have a top-level JSON object).

Anyway, if that is an array wrapper, you'll want something like this:

$('#my-hidden-field').val(theObject[0].id);

You can later retrieve it through a simple .val() call on the same field. This honestly looks kind of strange though. The hidden field won't persist across page requests, so why don't you just keep it in your own (pseudo-namespaced) value bucket? E.g.,

$MyNamespace = $MyNamespace || {};
$MyNamespace.myKey = theObject;

This will make it available to you from anywhere, without any hacky input field management. It's also a lot more efficient than doing DOM modification for simple value storage.

How do I detect unsigned integer multiply overflow?

You can't access the overflow flag from C/C++.

Some compilers allow you to insert trap instructions into the code. On GCC the option is -ftrapv.

The only portable and compiler independent thing you can do is to check for overflows on your own. Just like you did in your example.

However, -ftrapv seems to do nothing on x86 using the latest GCC. I guess it's a leftover from an old version or specific to some other architecture. I had expected the compiler to insert an INTO opcode after each addition. Unfortunately it does not do this.

How to change Toolbar Navigation and Overflow Menu icons (appcompat v7)?

which theme you have used in activity add below one line code

for white

<style name="AppTheme.NoActionBar">
      <item name="android:tint">#ffffff</item>
  </style>

or 
 <style name="AppThemeName" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:tint">#ffffff</item>
</style>

for black

   <style name="AppTheme.NoActionBar">
      <item name="android:tint">#000000</item>
  </style>

or 
 <style name="AppThemeName" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:tint">#000000</item>
</style>

How do I get rid of the "cannot empty the clipboard" error?

I found this advice:

There are a few steps to solve your problem:

First thing to do is Clear items from the Office Clipboard. If the Microsoft Office Clipboard is not displayed in the task pane, click Office Clipboard on the Edit menu. On the Office Clipboard task pane, do one of the following: To clear all items, click Clear All .

Next thing is to switch off the clipboard show option. To do this, what you can do is to again display the Clipboard menu (select Office Clipboard from Edit Menu). And in the selection button "Options" at the bottom of the screen, select this particular option: "Collect Without Showing Office Clipboard"

and now, you are relieved of the bug.

Hope this helps.

here. I have the problem, but it's sporadic. I just tried the technique, and I don't see the problem, but since it's sporadic I won't know for a while if it's gone for good.

How do I add a new column to a Spark DataFrame (using PySpark)?

To add new column with some custom value or dynamic value calculation which will be populated based on the existing columns.

e.g.

|ColumnA | ColumnB |
|--------|---------|
| 10     | 15      |
| 10     | 20      |
| 10     | 30      |

and new ColumnC as ColumnA+ColumnB

|ColumnA | ColumnB | ColumnC|
|--------|---------|--------|
| 10     | 15      | 25     |
| 10     | 20      | 30     |
| 10     | 30      | 40     |

using

#to add new column
def customColumnVal(row):
rd=row.asDict()
rd["ColumnC"]=row["ColumnA"] + row["ColumnB"]

new_row=Row(**rd)
return new_row
----------------------------
#convert DF to RDD
df_rdd= input_dataframe.rdd

#apply new fucntion to rdd
output_dataframe=df_rdd.map(customColumnVal).toDF()

input_dataframe is the dataframe which will get modified and customColumnVal function is having code to add new column.

Formatting PowerShell Get-Date inside string

You can use the -f operator

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

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

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

Convert a video to MP4 (H.264/AAC) with ffmpeg

Software patents led Debian/Ubuntu to disable the H.264 and AAC encoders in ffmpeg. See /usr/share/doc/ffmpeg/README.Debian.gz.

So go install x264, mplayer/mencoder, and Nero's AAC encoder. (Or, if you want to use all Free software, and don't care so much about audio quality, then sudo aptitude install faac.)

I don't remember if the medibuntu package of mencoder includes x264 vid encoding, since I build my own from git x264 and svn mplayer sources. (x264 is very actively developed, with significant quality and speed improvements frequently added.) http://git.videolan.org/?p=x264.git;a=summary

x264 is also packaged, but you should check that it's up to date enough to include weightp with recent bugfixes, and even more recent speed improvements...

Or if you're already willing to convert from .flv, instead of going from the high-quality source the flv was made from, then probably whatever recent version of x264 you can find will be fine.

Getting Keyboard Input

If you have Java 6 (You should have, btw) or higher, then simply do this :

 Console console = System.console();
 String str = console.readLine("Please enter the xxxx : ");

Please remember to do :

 import java.io.Console;

Thats it!

How to create a testflight invitation code?

after you add the user for testing. the user should get an email. open that email by your iOS device, then click "Start testing" it will bring you to testFlight to download the app directly. If you open that email via computer, and then click "Start testing" it will show you another page which have the instruction of how to install the app. and that invitation code is on the last line. those All upper case letters is the code.

How do I collapse a table row in Bootstrap?

I just came up with the same problem since we still use bootstrap 2.3.2.

My solution for this: http://jsfiddle.net/KnuU6/281/

css:

.myCollapse {
    display: none;
}
.myCollapse.in {
    display: block;
}

javascript:

 $("[data-toggle=myCollapse]").click(function( ev ) {
   ev.preventDefault();
   var target;
   if (this.hasAttribute('data-target')) {
 target = $(this.getAttribute('data-target'));
   } else {
 target = $(this.getAttribute('href'));
   };
   target.toggleClass("in");
 });

html:

<table>
  <tr><td><a href="#demo" data-toggle="myCollapse">Click me to toggle next row</a></td></tr>
  <tr class="collapse" id="#demo"><td>You can collapse and expand me.</td></tr>
</table>

Strip last two characters of a column in MySQL

You can use a LENGTH(that_string) minus the number of characters you want to remove in the SUBSTRING() select perhaps or use the TRIM() function.

Delete item from array and shrink array

I have created this function, or class. Im kinda new but my friend needed this also so I created this:

public String[] name(int index, String[] z ){
    if(index > z.length){
        return z;
    } else {
        String[] returnThis = new String[z.length - 1];
        int newIndex = 0;
        for(int i = 0; i < z.length; i++){
            if(i != index){
                returnThis[newIndex] = z[i];
                newIndex++;
            }
        }
        return returnThis; 
    }
}

Since its pretty revelant, I thought I would post it here.

Strange Jackson exception being thrown when serializing Hibernate object

I had the same problem. See if you are using hibernatesession.load(). If so, try converting to hibernatesession.get(). This solved my problem.

:last-child not working as expected?

:last-child will not work if the element is not the VERY LAST element

In addition to Harry's answer, I think it's crucial to add/emphasize that :last-child will not work if the element is not the VERY LAST element in a container. For whatever reason it took me hours to realize that, and even though Harry's answer is very thorough I couldn't extract that information from "The last-child selector is used to select the last child element of a parent."

Suppose this is my selector: a:last-child {}

This works:

<div>
    <a></a>
    <a>This will be selected</a>
</div>

This doesn't:

<div>
    <a></a>
    <a>This will no longer be selected</a>
    <div>This is now the last child :'( </div>
</div>

It doesn't because the a element is not the last element inside its parent.

It may be obvious, but it was not for me...

How can I save a base64-encoded image to disk?

UPDATE

I found this interesting link how to solve your problem in PHP. I think you forgot to replace space by +as shown in the link.

I took this circle from http://images-mediawiki-sites.thefullwiki.org/04/1/7/5/6204600836255205.png as sample which looks like:

http://images-mediawiki-sites.thefullwiki.org/04/1/7/5/6204600836255205.png

Next I put it through http://www.greywyvern.com/code/php/binary2base64 which returned me:

data:image/png;base64,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

saved this string to base64 which I read from in my code.

var fs      = require('fs'),
data        = fs.readFileSync('base64', 'utf8'),
base64Data,
binaryData;

base64Data  =   data.replace(/^data:image\/png;base64,/, "");
base64Data  +=  base64Data.replace('+', ' ');
binaryData  =   new Buffer(base64Data, 'base64').toString('binary');

fs.writeFile("out.png", binaryData, "binary", function (err) {
    console.log(err); // writes out file without error, but it's not a valid image
});

I get a circle back, but the funny thing is that the filesize has changed :)...

END

When you read back image I think you need to setup headers

Take for example imagepng from PHP page:

<?php
$im = imagecreatefrompng("test.png");

header('Content-Type: image/png');

imagepng($im);
imagedestroy($im);
?>

I think the second line header('Content-Type: image/png');, is important else your image will not be displayed in browser, but just a bunch of binary data is shown to browser.

In Express you would simply just use something like below. I am going to display your gravatar which is located at http://www.gravatar.com/avatar/cabf735ce7b8b4471ef46ea54f71832d?s=32&d=identicon&r=PG and is a jpeg file when you curl --head http://www.gravatar.com/avatar/cabf735ce7b8b4471ef46ea54f71832d?s=32&d=identicon&r=PG. I only request headers because else curl will display a bunch of binary stuff(Google Chrome immediately goes to download) to console:

curl --head "http://www.gravatar.com/avatar/cabf735ce7b8b4471ef46ea54f71832d?s=32&d=identicon&r=PG"
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 03 Aug 2011 12:11:25 GMT
Content-Type: image/jpeg
Connection: keep-alive
Last-Modified: Mon, 04 Oct 2010 11:54:22 GMT
Content-Disposition: inline; filename="cabf735ce7b8b4471ef46ea54f71832d.jpeg"
Access-Control-Allow-Origin: *
Content-Length: 1258
X-Varnish: 2356636561 2352219240
Via: 1.1 varnish
Expires: Wed, 03 Aug 2011 12:16:25 GMT
Cache-Control: max-age=300
Source-Age: 1482

$ mkdir -p ~/tmp/6922728
$ cd ~/tmp/6922728/
$ touch app.js

app.js

var app = require('express').createServer();

app.get('/', function (req, res) {
    res.contentType('image/jpeg');
    res.sendfile('cabf735ce7b8b4471ef46ea54f71832d?s=32&d=identicon&r=PG');
});

app.get('/binary', function (req, res) {
    res.sendfile('cabf735ce7b8b4471ef46ea54f71832d?s=32&d=identicon&r=PG');
});

app.listen(3000);

$ wget "http://www.gravatar.com/avatar/cabf735ce7b8b4471ef46ea54f71832d?s=32&d=identicon&r=PG"
$ node app.js

Html.DropdownListFor selected value not being set

You should forget the class

SelectList

Use this in your Controller:

var customerTypes = new[] 
{ 
    new SelectListItem(){Value = "all", Text= "All"},
    new SelectListItem(){Value = "business", Text= "Business"},
    new SelectListItem(){Value = "private", Text= "Private"},
};

Select the value:

var selectedCustomerType = customerTypes.FirstOrDefault(d => d.Value == "private");
if (selectedCustomerType != null)
    selectedCustomerType.Selected = true;

Add the list to the ViewData:

ViewBag.CustomerTypes = customerTypes;

Use this in your View:

@Html.DropDownList("SectionType", (SelectListItem[])ViewBag.CustomerTypes)

-

More information at: http://www.asp.net/mvc/overview/older-versions/working-with-the-dropdownlist-box-and-jquery/using-the-dropdownlist-helper-with-aspnet-mvc

Trigger an event on `click` and `enter`

Take a look at the keypress function.

I believe the enter key is 13 so you would want something like:

$('#searchButton').keypress(function(e){
    if(e.which == 13){  //Enter is key 13
        //Do something
    }
});

How to clear the canvas for redrawing

fastest way:

canvas = document.getElementById("canvas");
c = canvas.getContext("2d");

//... some drawing here

i = c.createImageData(canvas.width, canvas.height);
c.putImageData(i, 0, 0); // clear context by putting empty image data

Combining INSERT INTO and WITH/CTE

The WITH clause for Common Table Expressions go at the top.

Wrapping every insert in a CTE has the benefit of visually segregating the query logic from the column mapping.

Spot the mistake:

WITH _INSERT_ AS (
  SELECT
    [BatchID]      = blah
   ,[APartyNo]     = blahblah
   ,[SourceRowID]  = blahblahblah
  FROM Table1 AS t1
)
INSERT Table2
      ([BatchID], [SourceRowID], [APartyNo])
SELECT [BatchID], [APartyNo], [SourceRowID]   
FROM _INSERT_

Same mistake:

INSERT Table2 (
  [BatchID]
 ,[SourceRowID]
 ,[APartyNo]
)
SELECT
  [BatchID]      = blah
 ,[APartyNo]     = blahblah
 ,[SourceRowID]  = blahblahblah
FROM Table1 AS t1

A few lines of boilerplate make it extremely easy to verify the code inserts the right number of columns in the right order, even with a very large number of columns. Your future self will thank you later.

How to install and run Typescript locally in npm?

It took me a while to figure out the solution to this problem - it's in the original question. You need to have a script that calls tsc in your package.json file so that you can run:

npm run tsc 

Include -- before you pass in options (or just include them in the script):

npm run tsc -- -v

Here's an example package.json:

{
  "name": "foo",
  "scripts": {
    "tsc": "tsc"
  },
  "dependencies": {
    "typescript": "^1.8.10"
  }
}

Can an Android Toast be longer than Toast.LENGTH_LONG?

If you need a long Toast, there's a practical alternative, but it requires your user to click on an OK button to make it go away. You can use an AlertDialog like this:

String message = "This is your message";
new AlertDialog.Builder(YourActivityName.this)
    .setTitle("Optional Title (you can omit this)")
    .setMessage(message)
    .setPositiveButton("ok", null)
    .show();

If you have a long message, chances are, you don't know how long it will take for your user to read the message, so sometimes it is a good idea to require your user to click on an OK button to continue. In my case, I use this technique when a user clicks on a help icon.

Passing an array by reference in C?

The C language does not support pass by reference of any type. The closest equivalent is to pass a pointer to the type.

Here is a contrived example in both languages

C++ style API

void UpdateValue(int& i) {
  i = 42;
}

Closest C equivalent

void UpdateValue(int *i) {
  *i = 42;
}

How to escape a JSON string containing newline characters using JavaScript?

Like you, I have been looking into several comments and post to replace special escape characters in my JSON which contains html object inside that.

My object is to remove the special characters in JSON object and also render the html which is inside the json object.

Here is what I did and hope its very simple to use.

First I did JSON.stringify my json object and JSON.parse the result.

For eg:

JSON.parse(JSON.stringify(jsonObject));

And it solves my problem and done using Pure Javascript.

What is the difference between "mvn deploy" to a local repo and "mvn install"?

From the Maven docs, sounds like it's just a difference in which repository you install the package into:

  • install - install the package into the local repository, for use as a dependency in other projects locally
  • deploy - done in an integration or release environment, copies the final package to the remote repository for sharing with other developers and projects.

Maybe there is some confusion in that "install" to the CI server installs it to it's local repository, which then you as a user are sharing?

How to get image width and height in OpenCV?

You can use rows and cols:

cout << "Width : " << src.cols << endl;
cout << "Height: " << src.rows << endl;

or size():

cout << "Width : " << src.size().width << endl;
cout << "Height: " << src.size().height << endl;

How to write a basic swap function in Java

Here's a method to swap two variables in java in just one line using bitwise XOR(^) operator.

class Swap
{
   public static void main (String[] args)
   {
      int x = 5, y = 10;
      x = x ^ y ^ (y = x);
      System.out.println("New values of x and y are "+ x + ", " + y);
   }
} 

Output:

New values of x and y are 10, 5

HTTP Error 404.3-Not Found in IIS 7.5

I was having trouble accessing wcf service hosted locally in IIS. Running aspnet_regiis.exe -i wasn't working.

However, I fortunately came across the following:

Rahul's blog

which informs that servicemodelreg also needs to be run:

Run Visual Studio 2008 Command Prompt as “Administrator”. Navigate to C:\Windows\Microsoft.NET\Framework\v3.0\Windows Communication Foundation. Run this command servicemodelreg –i.

How to build and use Google TensorFlow C++ api

If you don't want to build Tensorflow yourself and your operating system is Debian or Ubuntu, you can download prebuilt packages with the Tensorflow C/C++ libraries. This distribution can be used for C/C++ inference with CPU, GPU support is not included:

https://github.com/kecsap/tensorflow_cpp_packaging/releases

There are instructions written how to freeze a checkpoint in Tensorflow (TFLearn) and load this model for inference with the C/C++ API:

https://github.com/kecsap/tensorflow_cpp_packaging/blob/master/README.md

Beware: I am the developer of this Github project.

Are PDO prepared statements sufficient to prevent SQL injection?

Yes, it is sufficient. The way injection type attacks work, is by somehow getting an interpreter (The database) to evaluate something, that should have been data, as if it was code. This is only possible if you mix code and data in the same medium (Eg. when you construct a query as a string).

Parameterised queries work by sending the code and the data separately, so it would never be possible to find a hole in that.

You can still be vulnerable to other injection-type attacks though. For example, if you use the data in a HTML-page, you could be subject to XSS type attacks.

How to round up the result of integer division?

A generic method, whose result you can iterate over may be of interest:

public static Object[][] chunk(Object[] src, int chunkSize) {

    int overflow = src.length%chunkSize;
    int numChunks = (src.length/chunkSize) + (overflow>0?1:0);
    Object[][] dest = new Object[numChunks][];      
    for (int i=0; i<numChunks; i++) {
        dest[i] = new Object[ (i<numChunks-1 || overflow==0) ? chunkSize : overflow ];
        System.arraycopy(src, i*chunkSize, dest[i], 0, dest[i].length); 
    }
    return dest;
}

UnicodeDecodeError: 'utf8' codec can't decode byte 0x9c

This solution works nice when using Latin American accents, such as 'ñ'.

I have solved this problem just by adding

df = pd.read_csv(fileName,encoding='latin1')

What is %0|%0 and how does it work?

What it is:

%0|%0 is a fork bomb. It will spawn another process using a pipe | which runs a copy of the same program asynchronously. This hogs the CPU and memory, slowing down the system to a near-halt (or even crash the system).

How this works:

%0 refers to the command used to run the current program. For example, script.bat

A pipe | symbol will make the output or result of the first command sequence as the input for the second command sequence. In the case of a fork bomb, there is no output, so it will simply run the second command sequence without any input.

Expanding the example, %0|%0 could mean script.bat|script.bat. This runs itself again, but also creating another process to run the same program again (with no input).

How do I programmatically set the value of a select box element using JavaScript?

You can use this function:

selectElement('leaveCode', '11')

function selectElement(id, valueToSelect) {    
    let element = document.getElementById(id);
    element.value = valueToSelect;
}

Identifying Exception Type in a handler Catch Block

try
{
}
catch (Exception err)
{
    if (err is Web2PDFException)
        DoWhatever();
}

but there is probably a better way of doing whatever it is you want.

Error: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp()

The answer may already be given somewhere but here is my take to this error which may be thrown for multiple reasons:

  1. Default app is initialized after the other one. Correct way is to initialize the default app first and then the rest.
  2. firebase.apps.app() is being called before default app initialization. This code is basically returning the default app instance. Since it is not present, hence the error.
  3. Lastly, you are initializing other firebase services like auth, database, firestore, etc before app is initialized.

How to create a simple checkbox in iOS?

Yeah, no checkbox for you in iOS (-:

Here, this is what I did to create a checkbox:

UIButton *checkbox;
BOOL checkBoxSelected;
checkbox = [[UIButton alloc] initWithFrame:CGRectMake(x,y,20,20)];
// 20x20 is the size of the checkbox that you want
// create 2 images sizes 20x20 , one empty square and
// another of the same square with the checkmark in it
// Create 2 UIImages with these new images, then:

[checkbox setBackgroundImage:[UIImage imageNamed:@"notselectedcheckbox.png"]
                    forState:UIControlStateNormal];
[checkbox setBackgroundImage:[UIImage imageNamed:@"selectedcheckbox.png"]
                    forState:UIControlStateSelected];
[checkbox setBackgroundImage:[UIImage imageNamed:@"selectedcheckbox.png"]
                    forState:UIControlStateHighlighted];
checkbox.adjustsImageWhenHighlighted=YES;
[checkbox addTarget:(nullable id) action:(nonnull SEL) forControlEvents:(UIControlEvents)];
[self.view addSubview:checkbox];

Now in the target method do the following:

-(void)checkboxSelected:(id)sender
{
    checkBoxSelected = !checkBoxSelected; /* Toggle */
    [checkbox setSelected:checkBoxSelected];
}

That's it!

How to debug Javascript with IE 8

You can get more information about IE8 Developer Toolbar debugging at Debugging JScript or Debugging Script with the Developer Tools.

How to prevent a jQuery Ajax request from caching in Internet Explorer?

Cache-Control: no-cache, no-store

These two header values can be combined to get the required effect on both IE and Firefox

How do I pass variables and data from PHP to JavaScript?

As per your code

<$php
     $val = $myService->getValue(); // Makes an API and database call
     echo '<span id="value">'.$val.'</span>';
$>

Now you can get value using DOM, use innerHTML of span id, in this case you don't need to do any call to server, or Ajax or another thing.

Your page will print it using PHP, and you JavaScript will get value using DOM.

Error inflating when extending a class

@Tim - Both the constructors are not required, only the ViewClassName(Context context, AttributeSet attrs ) constructor is necessary. I found this out the painful way, after hours and hours of wasted time.

I am very new to Android development, but I am making a wild guess here, that it maybe due to the fact that since we are adding the custom View class in the XML file, we are setting several attributes to it in the XML, which needs to be processed at the time of instantiation. Someone far more knowledgeable than me will be able to shed clearer light on this matter though.

How to stop C++ console application from exiting immediately?

See if your IDE has a checkbox in project setting to keep the window open after the program terminates. If not, use std::cin.get(); to read a character at the end of main function. However, be sure to use only line-based input (std::getline) or to deal with leftover unread characters otherwise (std::ignore until newline) because otherwise the .get() at the end will only read the garbage you left unread earlier.

Add custom message to thrown exception while maintaining stack trace in Java

Exceptions are usually immutable: you can't change their message after they've been created. What you can do, though, is chain exceptions:

throw new TransactionProblemException(transNbr, originalException);

The stack trace will look like

TransactionProblemException : transNbr
at ...
at ...
caused by OriginalException ...
at ...
at ...

Running vbscript from batch file

Well i am trying to open a .vbs within a batch file without having to click open but the answer to this question is ...

SET APPDATA=%CD%

start (your file here without the brackets with a .vbs if it is a vbd file)

How do I change file permissions in Ubuntu

If you just want to change file permissions, you want to be careful about using -R on chmod since it will change anything, files or folders. If you are doing a relative change (like adding write permission for everyone), you can do this:

sudo chmod -R a+w /var/www

But if you want to use the literal permissions of read/write, you may want to select files versus folders:

sudo find /var/www -type f -exec chmod 666 {} \;

(Which, by the way, for security reasons, I wouldn't recommend either of these.)

Or for folders:

sudo find /var/www -type d -exec chmod 755 {} \;

How to add hours to current time in python

from datetime import datetime, timedelta

nine_hours_from_now = datetime.now() + timedelta(hours=9)
#datetime.datetime(2012, 12, 3, 23, 24, 31, 774118)

And then use string formatting to get the relevant pieces:

>>> '{:%H:%M:%S}'.format(nine_hours_from_now)
'23:24:31'

If you're only formatting the datetime then you can use:

>>> format(nine_hours_from_now, '%H:%M:%S')
'23:24:31'

Or, as @eumiro has pointed out in comments - strftime

Does MS Access support "CASE WHEN" clause if connect with ODBC?

Since you are using Access to compose the query, you have to stick to Access's version of SQL.

To choose between several different return values, use the switch() function. So to translate and extend your example a bit:

select switch(
  age > 40, 4,
  age > 25, 3,
  age > 20, 2,
  age > 10, 1,
  true, 0
) from demo

The 'true' case is the default one. If you don't have it and none of the other cases match, the function will return null.

The Office website has documentation on this but their example syntax is VBA and it's also wrong. I've given them feedback on this but you should be fine following the above example.

Confirm deletion in modal / dialog using Twitter Bootstrap?

  // ---------------------------------------------------------- Generic Confirm  

  function confirm(heading, question, cancelButtonTxt, okButtonTxt, callback) {

    var confirmModal = 
      $('<div class="modal hide fade">' +    
          '<div class="modal-header">' +
            '<a class="close" data-dismiss="modal" >&times;</a>' +
            '<h3>' + heading +'</h3>' +
          '</div>' +

          '<div class="modal-body">' +
            '<p>' + question + '</p>' +
          '</div>' +

          '<div class="modal-footer">' +
            '<a href="#" class="btn" data-dismiss="modal">' + 
              cancelButtonTxt + 
            '</a>' +
            '<a href="#" id="okButton" class="btn btn-primary">' + 
              okButtonTxt + 
            '</a>' +
          '</div>' +
        '</div>');

    confirmModal.find('#okButton').click(function(event) {
      callback();
      confirmModal.modal('hide');
    });

    confirmModal.modal('show');     
  };

  // ---------------------------------------------------------- Confirm Put To Use

  $("i#deleteTransaction").live("click", function(event) {
    // get txn id from current table row
    var id = $(this).data('id');

    var heading = 'Confirm Transaction Delete';
    var question = 'Please confirm that you wish to delete transaction ' + id + '.';
    var cancelButtonTxt = 'Cancel';
    var okButtonTxt = 'Confirm';

    var callback = function() {
      alert('delete confirmed ' + id);
    };

    confirm(heading, question, cancelButtonTxt, okButtonTxt, callback);

  });

How to make Sonar ignore some classes for codeCoverage metric?

I think you 're looking for the solution described in this answer Exclude methods from code coverage with Cobertura Keep in mind that if you're using Sonar 3.2 you have specify that your coverage tool is cobertura and not jacoco ( default ), which doesn't support this kind of feature yet

String to Dictionary in Python

This data is JSON! You can deserialize it using the built-in json module if you're on Python 2.6+, otherwise you can use the excellent third-party simplejson module.

import json    # or `import simplejson as json` if on Python < 2.6

json_string = u'{ "id":"123456789", ... }'
obj = json.loads(json_string)    # obj now contains a dict of the data

Format ints into string of hex

From Python documentation. Using the built in format() function you can specify hexadecimal base using an 'x' or 'X' Example:

x= 255 print('the number is {:x}'.format(x))

Output:

the number is ff

Here are the base options

Type
'b' Binary format. Outputs the number in base 2. 'c' Character. Converts the integer to the corresponding unicode character before printing. 'd' Decimal Integer. Outputs the number in base 10. 'o' Octal format. Outputs the number in base 8. 'x' Hex format. Outputs the number in base 16, using lower- case letters for the digits above 9. 'X' Hex format. Outputs the number in base 16, using upper- case letters for the digits above 9. 'n' Number. This is the same as 'd', except that it uses the current locale setting to insert the appropriate number separator characters. None The same as 'd'.

Exec : display stdout "live"

After reviewing all the other answers, I ended up with this:

function oldSchoolMakeBuild(cb) {
    var makeProcess = exec('make -C ./oldSchoolMakeBuild',
         function (error, stdout, stderr) {
             stderr && console.error(stderr);
             cb(error);
        });
    makeProcess.stdout.on('data', function(data) {
        process.stdout.write('oldSchoolMakeBuild: '+ data);
    });
}

Sometimes data will be multiple lines, so the oldSchoolMakeBuild header will appear once for multiple lines. But this didn't bother me enough to change it.

Bin size in Matplotlib (Histogram)

I had the same issue as OP (I think!), but I couldn't get it to work in the way that Lastalda specified. I don't know if I have interpreted the question properly, but I have found another solution (it probably is a really bad way of doing it though).

This was the way that I did it:

plt.hist([1,11,21,31,41], bins=[0,10,20,30,40,50], weights=[10,1,40,33,6]);

Which creates this:

image showing histogram graph created in matplotlib

So the first parameter basically 'initialises' the bin - I'm specifically creating a number that is in between the range I set in the bins parameter.

To demonstrate this, look at the array in the first parameter ([1,11,21,31,41]) and the 'bins' array in the second parameter ([0,10,20,30,40,50]):

  • The number 1 (from the first array) falls between 0 and 10 (in the 'bins' array)
  • The number 11 (from the first array) falls between 11 and 20 (in the 'bins' array)
  • The number 21 (from the first array) falls between 21 and 30 (in the 'bins' array), etc.

Then I'm using the 'weights' parameter to define the size of each bin. This is the array used for the weights parameter: [10,1,40,33,6].

So the 0 to 10 bin is given the value 10, the 11 to 20 bin is given the value of 1, the 21 to 30 bin is given the value of 40, etc.

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

onblur fires when a field loses focus, while onchange fires when that field's value changes. These events will not always occur in the same order, however.

In Firefox, tabbing out of a changed field will fire onchange then onblur, and it will normally do the same in IE. However, if you press the enter key instead of tab, in Firefox it will fire onblur then onchange, while IE will usually fire in the original order. However, I've seen cases where IE will also fire blur first, so be careful. You can't assume that either the onblur or the onchange will happen before the other one.

Reorder / reset auto increment primary key

This works - https://stackoverflow.com/a/5437720/10219008.....but if you run into an issue 'Error Code: 1265. Data truncated for column 'id' at row 1'...Then run the following. Adding ignore on the update query.

SET @count = 0;
set sql_mode = 'STRICT_ALL_TABLES';
UPDATE IGNORE web_keyword SET id = @count := (@count+1);

How to make a variadic macro (variable number of arguments)

__VA_ARGS__ is the standard way to do it. Don't use compiler-specific hacks if you don't have to.

I'm really annoyed that I can't comment on the original post. In any case, C++ is not a superset of C. It is really silly to compile your C code with a C++ compiler. Don't do what Donny Don't does.

How to configure XAMPP to send mail from localhost?

in addition to all answers please note that in sendmail.ini file:

auth_password=this-is-Not-your-Gmail-password

due to new google security concern, you should follow these steps to make an application password for this purpose:

  1. go to https://accounts.google.com/ in security tab
  2. turn two-step-verification on
  3. go back to the security tab and make an App-password (in select-app drop-down menu you can choose 'other')

how to add jquery in laravel project

You can link libraries from cdn (Content delivery network):

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

Or link libraries locally, add css files in the css folder and jquery in js folder. You have to keep both folders in the laravel public folder then you can link like below:

<link rel="stylesheet" href="{{asset('css/bootstrap-theme.min.css')}}">
<script src="{{asset('js/jquery.min.js')}}"></script>

or else

{{ HTML::style('css/style.css') }}
{{ HTML::script('js/functions.js') }}

If you link js files and css files locally (like in the last two examples) you need to add js and css files to the js and css folders which are in public\js or public\css not in resources\assets.

how to set value of a input hidden field through javascript?

The first thing I will try - determine if your code with alerts is actually rendered. I see some server "if" code in what you posted, so may be condition to render javascript is not satisfied. So, on the page you working on, right-click -> view source. Try to find the js code there. Please tell us if you found the code on the page.

Change name of folder when cloning from GitHub?

git clone <Repo> <DestinationDirectory>

Clone the repository located at Repo into the folder called DestinationDirectory on the local machine.

Ignore Duplicates and Create New List of Unique Values in Excel

Honestly I followed these examples to a tee and they simply didn't work. What I ended up doing after struggling pointlessly trying to get Excel to work was to just copy the entire contents of my column to NotePad++ where I was able to find an easy solution within minutes. Take a look at this: Removing duplicate rows in Notepad++

Edit: Here is a brief overview of how to do it in TextFX:

Plugins -> Plugin Manager -> Show Plugin Manager -> Available tab -> TextFX -> Install

After TextFX is installed in NotePad++, then you select all your text you want to remove duplicates from, then make sure to check: TextFX -> TextFX Tools -> Sort outputs only UNIQUE lines

Then click "sort lines case sensitive" or "sort lines case insensitive" and it will perform the unique sort.

INSTALL_FAILED_UPDATE_INCOMPATIBLE when I try to install compiled .apk on device

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

How can I change the value of the elements in a vector?

Your code works fine. When I ran it I got the output:

The values in the file input.txt are:
1
2
3
4
5
6
7
8
9
10
The sum of the values is: 55
The mean value is: 5.5

But it could still be improved.

You are iterating over the vector using indexes. This is not the "STL Way" -- you should be using iterators, to wit:

typedef vector<double> doubles;
for( doubles::const_iterator it = v.begin(), it_end = v.end(); it != it_end; ++it )
{
    total += *it;
    mean = total / v.size();
}

This is better for a number of reasons discussed here and elsewhere, but here are two main reasons:

  1. Every container provides the iterator concept. Not every container provides random-access (eg, indexed access).
  2. You can generalize your iteration code.

Point number 2 brings up another way you can improve your code. Another thing about your code that isn't very STL-ish is the use of a hand-written loop. <algorithm>s were designed for this purpose, and the best code is the code you never write. You can use a loop to compute the total and mean of the vector, through the use of an accumulator:

#include <numeric>
#include <functional>
struct my_totals : public std::binary_function<my_totals, double, my_totals>
{
    my_totals() : total_(0), count_(0) {};
    my_totals operator+(double v) const
    {
        my_totals ret = *this;
        ret.total_ += v;
        ++ret.count_;
        return ret;
    }
    double mean() const { return total_/count_; }
    double total_;
    unsigned count_;
};

...and then:

my_totals ttls = std::accumulate(v.begin(), v.end(), my_totals());
cout << "The sum of the values is: " << ttls.total_ << endl;
cout << "The mean value is: " << ttls.mean() << endl;

EDIT:

If you have the benefit of a C++0x-compliant compiler, this can be made even simpler using std::for_each (within #include <algorithm>) and a lambda expression:

double total = 0;
for_each( v.begin(), v.end(), [&total](double  v) { total += v; });
cout << "The sum of the values is: " << total << endl;
cout << "The mean value is: " << total/v.size() << endl;

Change the background color of a row in a JTable

The other answers given here work well since you use the same renderer in every column.

However, I tend to believe that generally when using a JTable you will have different types of data in each columm and therefore you won't be using the same renderer for each column. In these cases you may find the Table Row Rendering approach helpfull.

How do I get sed to read from standard input?

  1. Open the file using vi myfile.csv
  2. Press Escape
  3. Type :%s/replaceme/withthis/
  4. Type :wq and press Enter

Now you will have the new pattern in your file.

HTML set image on browser tab

<link rel="SHORTCUT ICON" href="favicon.ico" type="image/x-icon" />
<link rel="ICON" href="favicon.ico" type="image/ico" />

Excellent tool for cross-browser favicon - http://www.convertico.com/

PHP how to get local IP of system

hostname(1) can tell the IP address: hostname --ip-address, or as man says, it's better to use hostname --all-ip-addresses

How to pass values across the pages in ASP.net without using Session

There are multiple ways to achieve this. I can explain you in brief about the 4 types which we use in our daily programming life cycle.

Please go through the below points.

1 Query String.

FirstForm.aspx.cs

Response.Redirect("SecondForm.aspx?Parameter=" + TextBox1.Text);

SecondForm.aspx.cs

TextBox1.Text = Request.QueryString["Parameter"].ToString();

This is the most reliable way when you are passing integer kind of value or other short parameters. More advance in this method if you are using any special characters in the value while passing it through query string, you must encode the value before passing it to next page. So our code snippet of will be something like this:

FirstForm.aspx.cs

Response.Redirect("SecondForm.aspx?Parameter=" + Server.UrlEncode(TextBox1.Text));

SecondForm.aspx.cs

TextBox1.Text = Server.UrlDecode(Request.QueryString["Parameter"].ToString());

URL Encoding

  1. Server.URLEncode
  2. HttpServerUtility.UrlDecode

2. Passing value through context object

Passing value through context object is another widely used method.

FirstForm.aspx.cs

TextBox1.Text = this.Context.Items["Parameter"].ToString();

SecondForm.aspx.cs

this.Context.Items["Parameter"] = TextBox1.Text;
Server.Transfer("SecondForm.aspx", true);

Note that we are navigating to another page using Server.Transfer instead of Response.Redirect.Some of us also use Session object to pass values. In that method, value is store in Session object and then later pulled out from Session object in Second page.

3. Posting form to another page instead of PostBack

Third method of passing value by posting page to another form. Here is the example of that:

FirstForm.aspx.cs

private void Page_Load(object sender, System.EventArgs e)
{
   buttonSubmit.Attributes.Add("onclick", "return PostPage();");
}

And we create a javascript function to post the form.

SecondForm.aspx.cs

function PostPage()
{
   document.Form1.action = "SecondForm.aspx";
   document.Form1.method = "POST";
   document.Form1.submit();
}
TextBox1.Text = Request.Form["TextBox1"].ToString();

Here we are posting the form to another page instead of itself. You might get viewstate invalid or error in second page using this method. To handle this error is to put EnableViewStateMac=false

4. Another method is by adding PostBackURL property of control for cross page post back

In ASP.NET 2.0, Microsoft has solved this problem by adding PostBackURL property of control for cross page post back. Implementation is a matter of setting one property of control and you are done.

FirstForm.aspx.cs

<asp:Button id=buttonPassValue style=”Z-INDEX: 102" runat=”server” Text=”Button”         PostBackUrl=”~/SecondForm.aspx”></asp:Button>

SecondForm.aspx.cs

TextBox1.Text = Request.Form["TextBox1"].ToString();

In above example, we are assigning PostBackUrl property of the button we can determine the page to which it will post instead of itself. In next page, we can access all controls of the previous page using Request object.

You can also use PreviousPage class to access controls of previous page instead of using classic Request object.

SecondForm.aspx

TextBox textBoxTemp = (TextBox) PreviousPage.FindControl(“TextBox1");
TextBox1.Text = textBoxTemp.Text;

As you have noticed, this is also a simple and clean implementation of passing value between pages.

Reference: MICROSOFT MSDN WEBSITE

HAPPY CODING!

Interpreting "condition has length > 1" warning from `if` function

Here's an easy way without ifelse:

(a/sum(a))^(a>0)

An example:

a <- c(0, 1, 0, 0, 1, 1, 0, 1)

(a/sum(a))^(a>0)

[1] 1.00 0.25 1.00 1.00 0.25 0.25 1.00 0.25

How do you make an array of structs in C?

Another way of initializing an array of structs is to initialize the array members explicitly. This approach is useful and simple if there aren't too many struct and array members.

Use the typedef specifier to avoid re-using the struct statement everytime you declare a struct variable:

typedef struct
{
    double p[3];//position
    double v[3];//velocity
    double a[3];//acceleration
    double radius;
    double mass;
}Body;

Then declare your array of structs. Initialization of each element goes along with the declaration:

Body bodies[n] = {{{0,0,0}, {0,0,0}, {0,0,0}, 0, 1.0}, 
                  {{0,0,0}, {0,0,0}, {0,0,0}, 0, 1.0}, 
                  {{0,0,0}, {0,0,0}, {0,0,0}, 0, 1.0}};

To repeat, this is a rather simple and straightforward solution if you don't have too many array elements and large struct members and if you, as you stated, are not interested in a more dynamic approach. This approach can also be useful if the struct members are initialized with named enum-variables (and not just numbers like the example above) whereby it gives the code-reader a better overview of the purpose and function of a structure and its members in certain applications.

How to do a case sensitive search in WHERE clause (I'm using SQL Server)?

Just as others said, you can perform a case sensitive search. Or just change the collation format of a specified column as me. For the User/Password columns in my database I change them to collation through the following command:

ALTER TABLE `UserAuthentication` CHANGE `Password` `Password` VARCHAR(255) CHARACTER SET latin1 COLLATE latin1_general_cs NOT NULL;

img tag displays wrong orientation

You can use Exif-JS , to check the "Orientation" property of the image. Then apply a css transform as needed.

EXIF.getData(imageElement, function() {
                var orientation = EXIF.getTag(this, "Orientation");

                if(orientation == 6)
                    $(imageElement).css('transform', 'rotate(90deg)')
});  

Submit form on pressing Enter with AngularJS

Very good, clean and simple directive with shift + enter support:

app.directive('enterSubmit', function () {
    return {
        restrict: 'A',
        link: function (scope, elem, attrs) {
            elem.bind('keydown', function(event) {
                 var code = event.keyCode || event.which;
                 if (code === 13) {
                       if (!event.shiftKey) {
                            event.preventDefault();
                            scope.$apply(attrs.enterSubmit);
                       }
                 }
            });
        }
    }
});

Check if a string is null or empty in XSLT

test="categoryName != ''"

Edit: This covers the most likely interpretation, in my opinion, of "[not] null or empty" as inferred from the question, including it's pseudo-code and my own early experience with XSLT. I.e., "What is the equivalent of the following Java?":

!(categoryName == null || categoryName.equals(""))

For more details e.g., distinctly identifying null vs. empty, see johnvey's answer below and/or the XSLT 'fiddle' I've adapted from that answer, which includes the option in Michael Kay's comment as well as the sixth possible interpretation.

How to apply Hovering on html area tag?

What I did was to create a canvas element that I then position in front of the image map. Then, whenever an area is moused-over, I call a func that gets the coord string for that shape and the shape-type. If it's a poly I use the coords to draw an outline on the canvas. If it's a rect I draw a rect outline. You could easily add code to deal with circles.

You could also set the opacity of the canvas to less than 100% before filling the poly/rect/circle. You could also change the reliance on a global for the canvas's context - this would mean you could deal with more than 1 image-map on the same page.

<!DOCTYPE html>
<html>
<head>
<script>

// stores the device context of the canvas we use to draw the outlines
// initialized in myInit, used in myHover and myLeave
var hdc;

// shorthand func
function byId(e){return document.getElementById(e);}

// takes a string that contains coords eg - "227,307,261,309, 339,354, 328,371, 240,331"
// draws a line from each co-ord pair to the next - assumes starting point needs to be repeated as ending point.
function drawPoly(coOrdStr)
{
    var mCoords = coOrdStr.split(',');
    var i, n;
    n = mCoords.length;

    hdc.beginPath();
    hdc.moveTo(mCoords[0], mCoords[1]);
    for (i=2; i<n; i+=2)
    {
        hdc.lineTo(mCoords[i], mCoords[i+1]);
    }
    hdc.lineTo(mCoords[0], mCoords[1]);
    hdc.stroke();
}

function drawRect(coOrdStr)
{
    var mCoords = coOrdStr.split(',');
    var top, left, bot, right;
    left = mCoords[0];
    top = mCoords[1];
    right = mCoords[2];
    bot = mCoords[3];
    hdc.strokeRect(left,top,right-left,bot-top); 
}

function myHover(element)
{
    var hoveredElement = element;
    var coordStr = element.getAttribute('coords');
    var areaType = element.getAttribute('shape');

    switch (areaType)
    {
        case 'polygon':
        case 'poly':
            drawPoly(coordStr);
            break;

        case 'rect':
            drawRect(coordStr);
    }
}

function myLeave()
{
    var canvas = byId('myCanvas');
    hdc.clearRect(0, 0, canvas.width, canvas.height);
}

function myInit()
{
    // get the target image
    var img = byId('img-imgmap201293016112');

    var x,y, w,h;

    // get it's position and width+height
    x = img.offsetLeft;
    y = img.offsetTop;
    w = img.clientWidth;
    h = img.clientHeight;

    // move the canvas, so it's contained by the same parent as the image
    var imgParent = img.parentNode;
    var can = byId('myCanvas');
    imgParent.appendChild(can);

    // place the canvas in front of the image
    can.style.zIndex = 1;

    // position it over the image
    can.style.left = x+'px';
    can.style.top = y+'px';

    // make same size as the image
    can.setAttribute('width', w+'px');
    can.setAttribute('height', h+'px');

    // get it's context
    hdc = can.getContext('2d');

    // set the 'default' values for the colour/width of fill/stroke operations
    hdc.fillStyle = 'red';
    hdc.strokeStyle = 'red';
    hdc.lineWidth = 2;
}
</script>

<style>
body
{
    background-color: gray;
}
canvas
{
    pointer-events: none;       /* make the canvas transparent to the mouse - needed since canvas is position infront of image */
    position: absolute;
}
</style>

<title></title>
</head>
<body onload='myInit()'>
    <canvas id='myCanvas'></canvas>     <!-- gets re-positioned in myInit(); -->
<center>
<img src='http://dailyaeen.com.pk/epaper/wp-content/uploads/2012/09/27+Sep+2012-1.jpg?1349003469874' usemap='#imgmap_css_container_imgmap201293016112' class='imgmap_css_container' title='imgmap201293016112' alt='imgmap201293016112' id='img-imgmap201293016112' />
<map id='imgmap201293016112' name='imgmap_css_container_imgmap201293016112'>
    <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="2,0,604,-3,611,-3,611,166,346,165,345,130,-2,130,-2,124,1,128,1,126" href="" alt="imgmap201293016112-0" title="imgmap201293016112-0" class="imgmap201293016112-area" id="imgmap201293016112-area-0" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,131,341,213" href="" alt="imgmap201293016112-1" title="imgmap201293016112-1" class="imgmap201293016112-area" id="imgmap201293016112-area-1" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="346,166,614,241" href="" alt="imgmap201293016112-2" title="imgmap201293016112-2" class="imgmap201293016112-area" id="imgmap201293016112-area-2" />
    <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="917,242,344,239,345,496,574,495,575,435,917,433" href="" alt="imgmap201293016112-3" title="imgmap201293016112-3" class="imgmap201293016112-area" id="imgmap201293016112-area-3" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,416,341,494" href="" alt="imgmap201293016112-4" title="imgmap201293016112-4" class="imgmap201293016112-area" id="imgmap201293016112-area-4" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,215,341,410" href="" alt="imgmap201293016112-5" title="imgmap201293016112-5" class="imgmap201293016112-area" id="imgmap201293016112-area-5" />
    <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="916,533,916,436,578,436,576,495,806,496,807,535" href="" alt="imgmap201293016112-6" title="imgmap201293016112-6" class="imgmap201293016112-area" id="imgmap201293016112-area-6" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="805,536,918,614" href="" alt="imgmap201293016112-7" title="imgmap201293016112-7" class="imgmap201293016112-area" id="imgmap201293016112-area-7" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="461,494,803,616" href="" alt="imgmap201293016112-8" title="imgmap201293016112-8" class="imgmap201293016112-area" id="imgmap201293016112-area-8" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,497,223,616" href="" alt="imgmap201293016112-9" title="imgmap201293016112-9" class="imgmap201293016112-area" id="imgmap201293016112-area-9" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="230,494,456,614" href="" alt="imgmap201293016112-10" title="imgmap201293016112-10" class="imgmap201293016112-area" id="imgmap201293016112-area-10" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="345,935,572,1082" href="" alt="imgmap201293016112-11" title="imgmap201293016112-11" class="imgmap201293016112-area" id="imgmap201293016112-area-11" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,617,457,760" href="" alt="imgmap201293016112-12" title="imgmap201293016112-12" class="imgmap201293016112-area" id="imgmap201293016112-area-12" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="345,760,577,847" href="" alt="imgmap201293016112-13" title="imgmap201293016112-13" class="imgmap201293016112-area" id="imgmap201293016112-area-13" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,759,344,906" href="" alt="imgmap201293016112-14" title="imgmap201293016112-14" class="imgmap201293016112-area" id="imgmap201293016112-area-14" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="346,850,571,935" href="" alt="imgmap201293016112-15" title="imgmap201293016112-15" class="imgmap201293016112-area" id="imgmap201293016112-area-15" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="578,761,915,865" href="" alt="imgmap201293016112-16" title="imgmap201293016112-16" class="imgmap201293016112-area" id="imgmap201293016112-area-16" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,1017,226,1085" href="" alt="imgmap201293016112-17" title="imgmap201293016112-17" class="imgmap201293016112-area" id="imgmap201293016112-area-17" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,908,342,1017" href="" alt="imgmap201293016112-18" title="imgmap201293016112-18" class="imgmap201293016112-area" id="imgmap201293016112-area-18" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="229,1010,342,1084" href="" alt="imgmap201293016112-19" title="imgmap201293016112-19" class="imgmap201293016112-area" id="imgmap201293016112-area-19" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,1086,340,1206" href="" alt="imgmap201293016112-20" title="imgmap201293016112-20" class="imgmap201293016112-area" id="imgmap201293016112-area-20" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,1209,224,1290" href="" alt="imgmap201293016112-21" title="imgmap201293016112-21" class="imgmap201293016112-area" id="imgmap201293016112-area-21" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,1290,225,1432" href="" alt="imgmap201293016112-22" title="imgmap201293016112-22" class="imgmap201293016112-area" id="imgmap201293016112-area-22" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,1432,340,1517" href="" alt="imgmap201293016112-23" title="imgmap201293016112-23" class="imgmap201293016112-area" id="imgmap201293016112-area-23" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="346,1432,686,1517" href="" alt="imgmap201293016112-24" title="imgmap201293016112-24" class="imgmap201293016112-area" id="imgmap201293016112-area-24" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="461,1266,686,1429" href="" alt="imgmap201293016112-25" title="imgmap201293016112-25" class="imgmap201293016112-area" id="imgmap201293016112-area-25" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="230,1365,455,1430" href="" alt="imgmap201293016112-26" title="imgmap201293016112-26" class="imgmap201293016112-area" id="imgmap201293016112-area-26" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="231,1291,457,1360" href="" alt="imgmap201293016112-27" title="imgmap201293016112-27" class="imgmap201293016112-area" id="imgmap201293016112-area-27" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="230,1210,342,1289" href="" alt="imgmap201293016112-28" title="imgmap201293016112-28" class="imgmap201293016112-area" id="imgmap201293016112-area-28" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="692,928,916,1016" href="" alt="imgmap201293016112-29" title="imgmap201293016112-29" class="imgmap201293016112-area" id="imgmap201293016112-area-29" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="460,616,916,759" href="" alt="imgmap201293016112-30" title="imgmap201293016112-30" class="imgmap201293016112-area" id="imgmap201293016112-area-30" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="693,1316,917,1518" href="" alt="imgmap201293016112-31" title="imgmap201293016112-31" class="imgmap201293016112-area" id="imgmap201293016112-area-31" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="344,1150,572,1219" href="" alt="imgmap201293016112-32" title="imgmap201293016112-32" class="imgmap201293016112-area" id="imgmap201293016112-area-32" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="693,1015,916,1171" href="" alt="imgmap201293016112-33" title="imgmap201293016112-33" class="imgmap201293016112-area" id="imgmap201293016112-area-33" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="577,955,686,1032" href="" alt="imgmap201293016112-34" title="imgmap201293016112-34" class="imgmap201293016112-area" id="imgmap201293016112-area-34" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="577,1036,687,1101" href="" alt="imgmap201293016112-35" title="imgmap201293016112-35" class="imgmap201293016112-area" id="imgmap201293016112-area-35" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="576,1104,689,1172" href="" alt="imgmap201293016112-36" title="imgmap201293016112-36" class="imgmap201293016112-area" id="imgmap201293016112-area-36" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="691,1232,918,1313" href="" alt="imgmap201293016112-37" title="imgmap201293016112-37" class="imgmap201293016112-area" id="imgmap201293016112-area-37" />
    <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="341,1085,573,1151" href="" alt="imgmap201293016112-38" title="imgmap201293016112-38" class="imgmap201293016112-area" id="imgmap201293016112-area-38" />
    <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="917,868,917,925,688,927,688,955,576,955,574,867,572,864" href="" alt="imgmap201293016112-39" title="imgmap201293016112-39" class="imgmap201293016112-area" id="imgmap201293016112-area-39" />
    <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="919,1173,917,1231,688,1231,688,1266,574,1267,576,1175,576,1175" href="" alt="imgmap201293016112-40" title="imgmap201293016112-40" class="imgmap201293016112-area" id="imgmap201293016112-area-40" />
    <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="572,1222,572,1265,459,1265,458,1289,339,1290,344,1225" href="" alt="imgmap201293016112-41" title="imgmap201293016112-41" class="imgmap201293016112-area" id="imgmap201293016112-area-41" />
</map>
</center>

</body>
</html>

Uncaught TypeError: Cannot read property 'msie' of undefined

$.browser was removed from jQuery starting with version 1.9. It is now available as a plugin. It's generally recommended to avoid browser detection, which is why it was removed.

How to change color in circular progress bar?

You can change your progressbar colour using the code below:

progressBar.getProgressDrawable().setColorFilter(
    getResources().getColor(R.color.your_color), PorterDuff.Mode.SRC_IN);

How to use boolean datatype in C?

C99 has a bool type. To use it,

#include <stdbool.h>

Commit history on remote repository

git isn't a centralized scm like svn so you have two options:

It may be annoying to implement for many different platforms (GitHub, GitLab, BitBucket, SourceForge, Launchpad, Gogs, ...) but fetching data is pretty slow (we talk about seconds) - no solution is perfect.


An example with fetching into a temporary directory:

git clone https://github.com/rust-lang/rust.git -b master --depth 3 --bare --filter=blob:none -q .
git log -n 3 --no-decorate --format=oneline

Alternatively:

git init --bare -q
git remote add -t master origin https://github.com/rust-lang/rust.git
git fetch --depth 3 --filter=blob:none -q
git log -n 3 --no-decorate --format=oneline origin/master

Both are optimized for performance by restricting to exactly 3 commits of one branch into a minimal local copy without file contents and preventing console outputs. Though opening a connection and calculating deltas during fetch takes some time.


An example with GitHub:

GET https://api.github.com/repos/rust-lang/rust/commits?sha=master&per_page=3

An example with GitLab:

GET https://gitlab.com/api/v4/projects/inkscape%2Finkscape/repository/commits?ref_name=master&per_page=3

Both are really fast but have different interfaces (like every platform).


Disclaimer: Rust and Inkscape were chosen because of their size and safety to stay, no advertisement

Prevent screen rotation on Android

Prevent Screen Rotation just add this following line in your Manifests.

<activity
        android:name=".YourActivity"
        android:screenOrientation="portrait" />

This works for me.

Stacked Bar Plot in R

The dataset:

dat <- read.table(text = "A   B   C   D   E   F    G
1 480 780 431 295 670 360  190
2 720 350 377 255 340 615  345
3 460 480 179 560  60 735 1260
4 220 240 876 789 820 100   75", header = TRUE)

Now you can convert the data frame into a matrix and use the barplot function.

barplot(as.matrix(dat))

enter image description here

Does Java SE 8 have Pairs or Tuples?

Eclipse Collections has Pair and all combinations of primitive/object Pairs (for all eight primitives).

The Tuples factory can create instances of Pair, and the PrimitiveTuples factory can be used to create all combinations of primitive/object pairs.

We added these before Java 8 was released. They were useful to implement key/value Iterators for our primitive maps, which we also support in all primitive/object combinations.

If you're willing to add the extra library overhead, you can use Stuart's accepted solution and collect the results into a primitive IntList to avoid boxing. We added new methods in Eclipse Collections 9.0 to allow for Int/Long/Double collections to be created from Int/Long/Double Streams.

IntList list = IntLists.mutable.withAll(intStream);

Note: I am a committer for Eclipse Collections.

Using Mysql in the command line in osx - command not found?

So there are few places where terminal looks for commands. This places are stored in your $PATH variable. Think of it as a global variable where terminal iterates over to look up for any command. This are usually binaries look how /bin folder is usually referenced.

/bin folder has lots of executable files inside it. Turns out this are command. This different folder locations are stored inside one Global variable i.e. $PATH separated by :

Now usually programs upon installation takes care of updating PATH & telling your terminal that hey i can be all commands inside my bin folder.

Turns out MySql doesn't do it upon install so we manually have to do it.

We do it by following command,

export PATH=$PATH:/usr/local/mysql/bin

If you break it down, export is self explanatory. Think of it as an assignment. So export a variable PATH with value old $PATH concat with new bin i.e. /usr/local/mysql/bin

This way after executing it all the commands inside /usr/local/mysql/bin are available to us.

There is a small catch here. Think of one terminal window as one instance of program and maybe something like $PATH is class variable ( maybe ). Note this is pure assumption. So upon close we lose the new assignment. And if we reopen terminal we won't have access to our command again because last when we exported, it was stored in primary memory which is volatile.

Now we need to have our mysql binaries exported every-time we use terminal. So we have to persist concat in our path.

You might be aware that our terminal using something called dotfiles to load configuration on terminal initialisation. I like to think of it's as sets of thing passed to constructer every-time a new instance of terminal is created ( Again an assumption but close to what it might be doing ). So yes by now you get the point what we are going todo.

.bash_profile is one of the primary known dotfile.

So in following command,

echo 'export PATH=$PATH:/usr/local/mysql/bin' >> ~/.bash_profile

What we are doing is saving result of echo i.e. output string to ~/.bash_profile

So now as we noted above every-time we open terminal or instance of terminal our dotfiles are loaded. So .bash_profile is loaded respectively and export that we appended above is run & thus a our global $PATH gets updated and we get all the commands inside /usr/local/mysql/bin.

P.s.

if you are not running first command export directly but just running second in order to persist it? Than for current running instance of terminal you have to,

source ~/.bash_profile

This tells our terminal to reload that particular file.

Remove icon/logo from action bar on android

Go in your manifest and find the your activity then add this code:

android:theme="@android:style/Theme.NoTitleBar"

above line hide your Actionbar .

If you need to other feature you can see other options with (CLR + SPC).

"Items collection must be empty before using ItemsSource."

In My case, it was just an extra StackPanel inside the ListView:

<ListView Name="_details" Margin="50,0,50,0">
            <StackPanel Orientation="Vertical">
                <StackPanel Orientation="Vertical">
                    <TextBlock Text="{Binding Location.LicenseName, StringFormat='Location: {0}'}"/>
                    <TextBlock Text="{Binding Ticket.Employee.s_name, StringFormat='Served by: {0}'}"/>
                    <TextBlock Text="{Binding Ticket.dt_create_time, StringFormat='Started at: {0}'}"/>
                    <Line StrokeThickness="2" Stroke="Gray" Stretch="Fill" Margin="0,5,0,5" />
                    <ItemsControl ItemsSource="{Binding Items}"/>
                </StackPanel>
            </StackPanel>
        </ListView>

Becomes:

<ListView Name="_details" Margin="50,0,50,0">
                <StackPanel Orientation="Vertical">
                    <TextBlock Text="{Binding Location.LicenseName, StringFormat='Location: {0}'}"/>
                    <TextBlock Text="{Binding Ticket.Employee.s_name, StringFormat='Served by: {0}'}"/>
                    <TextBlock Text="{Binding Ticket.dt_create_time, StringFormat='Started at: {0}'}"/>
                    <Line StrokeThickness="2" Stroke="Gray" Stretch="Fill" Margin="0,5,0,5" />
                    <ItemsControl ItemsSource="{Binding Items}"/>
                </StackPanel>
        </ListView>

and all is well.

What does @media screen and (max-width: 1024px) mean in CSS?

If your media query condition is true then your CSS with that condition will work. That means CSS within your media query's condition pixel size will effect, or else if the condition will fail that mean if the device's width is greater than 1024px than your CSS will not work.Because your media query condition false.

max-width is your max CSS limit till that width.

MySQL Select Date Equal to Today

You can use the CONCAT with CURDATE() to the entire time of the day and then filter by using the BETWEEN in WHERE condition:

SELECT users.id, DATE_FORMAT(users.signup_date, '%Y-%m-%d') 
FROM users 
WHERE (users.signup_date BETWEEN CONCAT(CURDATE(), ' 00:00:00') AND CONCAT(CURDATE(), ' 23:59:59'))

Android: Is it possible to display video thumbnails?

This is code for live Video thumbnail.

public class LoadVideoThumbnail extends AsyncTask<Object, Object, Bitmap>{

        @Override
        protected Bitmap doInBackground(Object... params) {try {

            String mMediaPath = "http://commonsware.com/misc/test2.3gp";
            Log.e("TEST Chirag","<< thumbnail doInBackground"+ mMediaPath);
            FileOutputStream out;
            File land=new File(Environment.getExternalStorageDirectory().getAbsoluteFile()
                            +"/portland.jpg");

                Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(mMediaPath, MediaStore.Video.Thumbnails.MICRO_KIND);
                        ByteArrayOutputStream stream = new ByteArrayOutputStream();
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
                        byte[] byteArray = stream.toByteArray();

                        out=new  FileOutputStream(land.getPath());
                        out.write(byteArray);
                        out.close();
                 return bitmap;

            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        return null;
            }
        @Override
        protected void onPostExecute(Bitmap result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            if(result != null){
                 ((ImageView)findViewById(R.id.imageView1)).setImageBitmap(result);
            }
            Log.e("TEST Chirag","====> End");
        }

    }

Spring Boot @autowired does not work, classes in different package

For this kind of issue, I ended up in putting @Service annotation on the newly created service class then the autowire was picked up. So, try to check those classes which are not getting autowired, if they need the corresponding required annotations(like @Controller, @Service, etc.) applied to them and then try to build the project again.

How to know the version of pip itself

`pip -v` or `pip --v` 

However note, if you are using macos catelina which has the zsh (z shell) it might give you a whole bunch of things, so the best option is to try install the version or start as -- pip3

Sending and receiving UDP packets?

The receiver must set port of receiver to match port set in sender DatagramPacket. For debugging try listening on port > 1024 (e.g. 8000 or 9000). Ports < 1024 are typically used by system services and need admin access to bind on such a port.

If the receiver sends packet to the hard-coded port it's listening to (e.g. port 57) and the sender is on the same machine then you would create a loopback to the receiver itself. Always use the port specified from the packet and in case of production software would need a check in any case to prevent such a case.

Another reason a packet won't get to destination is the wrong IP address specified in the sender. UDP unlike TCP will attempt to send out a packet even if the address is unreachable and the sender will not receive an error indication. You can check this by printing the address in the receiver as a precaution for debugging.

In the sender you set:

 byte [] IP= { (byte)192, (byte)168, 1, 106 };
 InetAddress address = InetAddress.getByAddress(IP);

but might be simpler to use the address in string form:

 InetAddress address = InetAddress.getByName("192.168.1.106");

In other words, you set target as 192.168.1.106. If this is not the receiver then you won't get the packet.

Here's a simple UDP Receiver that works :

import java.io.IOException;
import java.net.*;

public class Receiver {

    public static void main(String[] args) {
        int port = args.length == 0 ? 57 : Integer.parseInt(args[0]);
        new Receiver().run(port);
    }

    public void run(int port) {    
      try {
        DatagramSocket serverSocket = new DatagramSocket(port);
        byte[] receiveData = new byte[8];
        String sendString = "polo";
        byte[] sendData = sendString.getBytes("UTF-8");

        System.out.printf("Listening on udp:%s:%d%n",
                InetAddress.getLocalHost().getHostAddress(), port);     
        DatagramPacket receivePacket = new DatagramPacket(receiveData,
                           receiveData.length);

        while(true)
        {
              serverSocket.receive(receivePacket);
              String sentence = new String( receivePacket.getData(), 0,
                                 receivePacket.getLength() );
              System.out.println("RECEIVED: " + sentence);
              // now send acknowledgement packet back to sender     
              DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length,
                   receivePacket.getAddress(), receivePacket.getPort());
              serverSocket.send(sendPacket);
        }
      } catch (IOException e) {
              System.out.println(e);
      }
      // should close serverSocket in finally block
    }
}

Using PI in python 2.7

Python 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import math
>>> math.pi
3.141592653589793

Check out the Python tutorial on modules and how to use them.

As for the second part of your question, Python comes with batteries included, of course:

>>> math.radians(90)
1.5707963267948966
>>> math.radians(180)
3.141592653589793

jquery - Click event not working for dynamically created button

My guess is that the buttons you created are not yet on the page by the time you bind the button. Either bind each button in the $.getJSON function, or use a dynamic binding method like:

$('body').on('click', 'button', function() {
    ...
});

Note you probably don't want to do this on the 'body' tag, but instead wrap the buttons in another div or something and call on on it.

jQuery On Method

Eclipse shows errors but I can't find them

Right Click on Project -> Build Path -> Configure Build Path. Check if Maven Dependencies is there in list, if not then update maven project by Right Click on Project -> Maven -> Update Project

Location of ini/config files in linux/unix?

For user configuration I've noticed a tendency towards moving away from individual ~/.myprogramrc to a structure below ~/.config. For example, Qt 4 uses ~/.config/<vendor>/<programname> with the default settings of QSettings. The major desktop environments KDE and Gnome use a file structure below a specific folder too (not sure if KDE 4 uses ~/.config, XFCE does use ~/.config).

Hive cast string to date dd-MM-yyyy

AFAIK you must reformat your String in ISO format to be able to cast it as a Date:

cast(concat(substr(STR_DMY,7,4), '-',
            substr(STR_DMY,1,2), '-',
            substr(STR_DMY,4,2)
           )
     as date
     ) as DT

To display a Date as a String with specific format, then it's the other way around, unless you have Hive 1.2+ and can use date_format()

=> did you check the documentation by the way?

Installing lxml module in python

Just do:

sudo apt-get install python-lxml

For Python 2 (e.g., required by Inkscape):

sudo apt-get install python2-lxml

If you are planning to install from source, then albertov's answer will help. But unless there is a reason, don't, just install it from the repository.

how do I get eclipse to use a different compiler version for Java?

Eclipse uses it's own internal compiler that can compile to several Java versions.

From Eclipse Help > Java development user guide > Concepts > Java Builder

The Java builder builds Java programs using its own compiler (the Eclipse Compiler for Java) that implements the Java Language Specification.

For Eclipse Mars.1 Release (4.5.1), this can target 1.3 to 1.8 inclusive.

When you configure a project:

[project-name] > Properties > Java Compiler > Compiler compliance level

This configures the Eclipse Java compiler to compile code to the specified Java version, typically 1.8 today.

Host environment variables, eg JAVA_HOME etc, are not used.

The Oracle/Sun JDK compiler is not used.

Java: Instanceof and Generics

I had the same problem and here is my solution (very humble, @george: this time compiling AND working ...).

My probem was inside an abstract class that implements Observer. The Observable fires method update(...) with Object class that can be any kind of Object.

I only want to handler Objects of type T

The solution is to pass the class to the constructor in order to be able to compare types at runtime.

public abstract class AbstractOne<T> implements Observer {

  private Class<T> tClass;
    public AbstractOne(Class<T> clazz) {
    tClass = clazz;
  }

  @Override
  public void update(Observable o, Object arg) {
    if (tClass.isInstance(arg)) {
      // Here I am, arg has the type T
      foo((T) arg);
    }
  }

  public abstract foo(T t);

}

For the implementation we just have to pass the Class to the constructor

public class OneImpl extends AbstractOne<Rule> {
  public OneImpl() {
    super(Rule.class);
  }

  @Override
  public void foo(Rule t){
  }
}

Link to Flask static files with url_for

You have by default the static endpoint for static files. Also Flask application has the following arguments:

static_url_path: can be used to specify a different path for the static files on the web. Defaults to the name of the static_folder folder.

static_folder: the folder with static files that should be served at static_url_path. Defaults to the 'static' folder in the root path of the application.

It means that the filename argument will take a relative path to your file in static_folder and convert it to a relative path combined with static_url_default:

url_for('static', filename='path/to/file')

will convert the file path from static_folder/path/to/file to the url path static_url_default/path/to/file.

So if you want to get files from the static/bootstrap folder you use this code:

<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='bootstrap/bootstrap.min.css') }}">

Which will be converted to (using default settings):

<link rel="stylesheet" type="text/css" href="static/bootstrap/bootstrap.min.css">

Also look at url_for documentation.

How do you use the Immediate Window in Visual Studio?

One nice feature of the Immediate Window in Visual Studio is its ability to evaluate the return value of a method particularly if it is called by your client code but it is not part of a variable assignment. In Debug mode, as mentioned, you can interact with variables and execute expressions in memory which plays an important role in being able to do this.

For example, if you had a static method that returns the sum of two numbers such as:

private static int GetSum(int a, int b)
{
    return a + b;
}

Then in the Immediate Window you can type the following:

? GetSum(2, 4)
6

As you can seen, this works really well for static methods. However, if the method is non-static then you need to interact with a reference to the object the method belongs to.

For example, let’s say this is what your class looks like:

private class Foo
{
    public string GetMessage()
    {
        return "hello";
    }
}

If the object already exists in memory and it’s in scope, then you can call it in the Immediate Window as long as it has been instantiated before your current breakpoint (or, at least, before wherever the code is paused in debug mode):

? foo.GetMessage(); // object ‘foo’ already exists
"hello"

In addition, if you want to interact and test the method directly without relying on an existing instance in memory, then you can instantiate your own instance in the Immediate Window:

? Foo foo = new Foo(); // new instance of ‘Foo’
{temp.Program.Foo}
? foo.GetMessage()
"hello"

You can take it a step further and temporarily assign the method's results to variables if you want to do further evaluations, calculations, etc.:

? string msg = foo.GetMessage();
"hello"
? msg + " there!"
"hello there!"

Furthermore, if you don’t even want to declare a variable name for a new object and just want to run one of its methods/functions then do this:

? new Foo().GetMessage()
"hello" 

A very common way to see the value of a method is to select the method name of a class and do a ‘Add Watch’ so that you can see its current value in the Watch window. However, once again, the object needs to be instantiated and in scope for a valid value to be displayed. This is much less powerful and more restrictive than using the Immediate Window.

Along with inspecting methods, you can do simple math equations:

? 5 * 6
30

or compare values:

? 5==6
false
? 6==6
true

The question mark ('?') is unnecessary if you are in directly in the Immediate Window but it is included here for clarity (to distinguish between the typed in expressions versus the results.) However, if you are in the Command Window and need to do some quick stuff in the Immediate Window then precede your statements with '?' and off you go.

Intellisense works in the Immediate Window, but it sometimes can be a bit inconsistent. In my experience, it seems to be only available in Debug mode, but not in design, non-debug mode.

Unfortunately, another drawback of the Immediate Window is that it does not support loops.

Swift do-try-catch syntax

Swift is worry that your case statement is not covering all cases, to fix it you need to create a default case:

do {
    let sandwich = try makeMeSandwich(kitchen)
    print("i eat it \(sandwich)")
} catch SandwichError.NotMe {
    print("Not me error")
} catch SandwichError.DoItYourself {
    print("do it error")
} catch Default {
    print("Another Error")
}

What is the difference between x86 and x64

x64 is a generic name for the 64-bit extensions to Intel's and AMD's 32-bit x86 instruction set architecture (ISA). AMD introduced the first version of x64, initially called x86-64 and later renamed AMD64. Intel named their implementation IA-32e and then EMT64.

JavaScript Infinitely Looping slideshow with delays?

The key is not to schedule all pics at once, but to schedule a next pic each time you have a pic shown.

var current = 0;
var num_slides = 10;
function slide() {
    // here display the current slide, then:

    current = (current + 1) % num_slides;
    setTimeout(slide, 3000);
}

The alternative is to use setInterval, which sets the function to repeat regularly (as opposed to setTimeout, which schedules the next appearance only.

How do I get the time difference between two DateTime objects using C#?

private void button1_Click(object sender, EventArgs e)
{
    TimeSpan timespan;
    timespan = dateTimePicker2.Value - dateTimePicker1.Value;
    int timeDifference = timespan.Days;
    MessageBox.Show(timeDifference.ToString());
}

Can I use GDB to debug a running process?

ps -elf doesn't seem to show the PID. I recommend using instead:

ps -ld | grep foo
gdb -p PID

Count number of lines in a git repository

I did this:

git ls-files | xargs file | grep "ASCII" | cut -d : -f 1 | xargs wc -l

this works if you count all text files in the repository as the files of interest. If some are considered documentation, etc, an exclusion filter can be added.

Capturing URL parameters in request.GET

This is another alternate solution that can be implemented:

In the URL configuration:

urlpatterns = [path('runreport/<str:queryparams>', views.get)]

In the views:

list2 = queryparams.split("&")

Detect when an HTML5 video finishes

Have a look at this Everything You Need to Know About HTML5 Video and Audio post at the Opera Dev site under the "I want to roll my own controls" section.

This is the pertinent section:

<video src="video.ogv">
     video not supported
</video>

then you can use:

<script>
    var video = document.getElementsByTagName('video')[0];

    video.onended = function(e) {
      /*Do things here!*/
    };
</script>

onended is a HTML5 standard event on all media elements, see the HTML5 media element (video/audio) events documentation.

How to make MySQL handle UTF-8 properly

Your answer is you can configure by MySql Settings. In My Answer may be something gone out of context but this is also know is help for you.
how to configure Character Set and Collation.

For applications that store data using the default MySQL character set and collation (latin1, latin1_swedish_ci), no special configuration should be needed. If applications require data storage using a different character set or collation, you can configure character set information several ways:

  • Specify character settings per database. For example, applications that use one database might require utf8, whereas applications that use another database might require sjis.
  • Specify character settings at server startup. This causes the server to use the given settings for all applications that do not make other arrangements.
  • Specify character settings at configuration time, if you build MySQL from source. This causes the server to use the given settings for all applications, without having to specify them at server startup.

The examples shown here for your question to set utf8 character set , here also set collation for more helpful(utf8_general_ci collation`).

Specify character settings per database

  CREATE DATABASE new_db
  DEFAULT CHARACTER SET utf8
  DEFAULT COLLATE utf8_general_ci;

Specify character settings at server startup

[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci

Specify character settings at MySQL configuration time

shell> cmake . -DDEFAULT_CHARSET=utf8 \
           -DDEFAULT_COLLATION=utf8_general_ci

To see the values of the character set and collation system variables that apply to your connection, use these statements:

SHOW VARIABLES LIKE 'character_set%';
SHOW VARIABLES LIKE 'collation%';

This May be lengthy answer but there is all way, you can use. Hopeful my answer is helpful for you. for more information http://dev.mysql.com/doc/refman/5.7/en/charset-applications.html

How to count the number of set bits in a 32-bit integer?

This can be done in O(k), where k is the number of bits set.

int NumberOfSetBits(int n)
{
    int count = 0;

    while (n){
        ++ count;
        n = (n - 1) & n;
    }

    return count;
}

Get all photos from Instagram which have a specific hashtag with PHP

To get more than 20 you can use a load more button.

index.php

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Instagram more button example</title>
  <!--
    Instagram PHP API class @ Github
    https://github.com/cosenary/Instagram-PHP-API
  -->
  <style>
    article, aside, figure, footer, header, hgroup, 
    menu, nav, section { display: block; }
    ul {
      width: 950px;
    }
    ul > li {
      float: left;
      list-style: none;
      padding: 4px;
    }
    #more {
      bottom: 8px;
      margin-left: 80px;
      position: fixed;
      font-size: 13px;
      font-weight: 700;
      line-height: 20px;
    }
  </style>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
  <script>
    $(document).ready(function() {
      $('#more').click(function() {
        var tag   = $(this).data('tag'),
            maxid = $(this).data('maxid');

        $.ajax({
          type: 'GET',
          url: 'ajax.php',
          data: {
            tag: tag,
            max_id: maxid
          },
          dataType: 'json',
          cache: false,
          success: function(data) {
            // Output data
            $.each(data.images, function(i, src) {
              $('ul#photos').append('<li><img src="' + src + '"></li>');
            });

            // Store new maxid
            $('#more').data('maxid', data.next_id);
          }
        });
      });
    });
  </script>
</head>
<body>

<?php
  /**
   * Instagram PHP API
   */

   require_once 'instagram.class.php';

    // Initialize class with client_id
    // Register at http://instagram.com/developer/ and replace client_id with your own
    $instagram = new Instagram('ENTER CLIENT ID HERE');

    // Get latest photos according to geolocation for Växjö
    // $geo = $instagram->searchMedia(56.8770413, 14.8092744);

    $tag = 'sweden';

    // Get recently tagged media
    $media = $instagram->getTagMedia($tag);

    // Display first results in a <ul>
    echo '<ul id="photos">';

    foreach ($media->data as $data) 
    {
        echo '<li><img src="'.$data->images->thumbnail->url.'"></li>';
    }
    echo '</ul>';

    // Show 'load more' button
    echo '<br><button id="more" data-maxid="'.$media->pagination->next_max_id.'" data-tag="'.$tag.'">Load more ...</button>';
?>

</body>
</html>

ajax.php

<?php
    /**
     * Instagram PHP API
     */

     require_once 'instagram.class.php';

      // Initialize class for public requests
      $instagram = new Instagram('ENTER CLIENT ID HERE');

      // Receive AJAX request and create call object
      $tag = $_GET['tag'];
      $maxID = $_GET['max_id'];
      $clientID = $instagram->getApiKey();

      $call = new stdClass;
      $call->pagination->next_max_id = $maxID;
      $call->pagination->next_url = "https://api.instagram.com/v1/tags/{$tag}/media/recent?client_id={$clientID}&max_tag_id={$maxID}";

      // Receive new data
      $media = $instagram->getTagMedia($tag,$auth=false,array('max_tag_id'=>$maxID));

      // Collect everything for json output
      $images = array();
      foreach ($media->data as $data) {
        $images[] = $data->images->thumbnail->url;
      }

      echo json_encode(array(
        'next_id' => $media->pagination->next_max_id,
        'images'  => $images
      ));
?>

instagram.class.php

Find the function getTagMedia() and replace with:

public function getTagMedia($name, $auth=false, $params=null) {
    return $this->_makeCall('tags/' . $name . '/media/recent', $auth, $params);
}

How to store phone numbers on MySQL databases?

  • All as varchar (they aren't numbers but "collections of digits")
  • Country + area + number separately
  • Not all countries have area code (eg Malta where I am)
  • Some countries drop the leading zero from the area code when dialling internal (eg UK)
  • Format in the client code

What is the use of the %n format specifier in C?

The argument associated with the %n will be treated as an int* and is filled with the number of total characters printed at that point in the printf.

SQL Server add auto increment primary key to existing table

ALTER TABLE table_name ADD COLUMN ID INT NOT NULL PRIMARY KEY AUTO_INCREMENT ; This could be useful

Why doesn't java.util.Set have get(int index)?

If you don't mind the set to be sorted then you may be interested to take a look at the indexed-tree-map project.

The enhanced TreeSet/TreeMap provides access to elements by index or getting the index of an element. And the implementation is based on updating node weights in the RB tree. So no iteration or backing up by a list here.

How do I increment a DOS variable in a FOR /F loop?

What about this simple code, works for me and on Windows 7

set cntr=1
:begin
echo %cntr%
set /a cntr=%cntr%+1
if %cntr% EQU 1000 goto end
goto begin

:end

What do raw.githubusercontent.com URLs represent?

The raw.githubusercontent.com domain is used to serve unprocessed versions of files stored in GitHub repositories. If you browse to a file on GitHub and then click the Raw link, that's where you'll go.

The URL in your question references the install file in the master branch of the Homebrew/install repository. The rest of that command just retrieves the file and runs ruby on its contents.

Link error "undefined reference to `__gxx_personality_v0'" and g++

If g++ still gives error Try using:

g++ file.c -lstdc++

Look at this post: What is __gxx_personality_v0 for?

Make sure -lstdc++ is at the end of the command. If you place it at the beginning (i.e. before file.c), you still can get this same error.

How to enable relation view in phpmyadmin

Enabling Relation View in phpMyAdmin / MAMP

If you’re using MAMP for your database driven projects you’ll probably be using phpMyAdmin to administer your MySQL database if you’ve decided to go down that route. If you’re creating a database you might be wondering how to create relationships and foriegn keys for your tables.

Firstly you need to check that you have access to the Relation view. To do this open phpMyAdmin and select a database. You need to make sure your tables’ storage engine is set to use InnoDB. Click on a table within your database and choose the Operations tab. Make sure that the storage engine is set to use InnoDB and save your changes.

Now, go back to your table view and click the Structure tab. Depending on your version of phpMyAdmin you should see a link titled Relation view below the table structure. If you can see it you’re good to go. If you can’t you’ll need to follow the steps below to set phpMyAdmin to enable Relations view.

  1. Find /Applications/MAMP/bin/phpMyAdmin/scripts/create_tables.sql
  2. I left this file default but you can change the table name to anything you want. I left mine phpMyAdmin
  3. Open phpMyAdmin and go to the Import tab.
  4. Click the browse button and find the create_tables.sql file and then click Go.
  5. The tables required for Relation view will be added to the database you specified.
  6. Open /Applications/MAMP/bin/phpMyAdmin/config.inc.php
  7. Find the Server(s) configuration code block and replace/uncomment the following code and fill in the values. If you left everything default in the create_tables.sql file then you should just cut and paste the lines below.

    $cfg['Servers'][$i]['pmadb'] = 'phpmyadmin';
    $cfg['Servers'][$i]['bookmarktable'] = 'pma_bookmark';
    $cfg['Servers'][$i]['relation'] = 'pma_relation';
    $cfg['Servers'][$i]['table_info'] = 'pma_table_info';
    $cfg['Servers'][$i]['table_coords'] = 'pma_table_coords';
    $cfg['Servers'][$i]['pdf_pages'] = 'pma_pdf_pages';
    $cfg['Servers'][$i]['column_info'] = 'pma_column_info';
    $cfg['Servers'][$i]['history'] = 'pma_history';
    
  8. Save the file and restart MAMP and refresh your phpMyAdmin console.

  9. Go to your database and view one of your tables in Structure mode. You should now see the Relation view link.

Source: http://newvibes.com/blog/enabling-relation-view-in-phpmyadmin-mamp/

Git undo changes in some files

Source : http://git-scm.com/book/en/Git-Basics-Undoing-Things

git checkout -- modifiedfile.java


1)$ git status

you will see the modified file

2)$git checkout -- modifiedfile.java

3)$git status

How to efficiently calculate a running standard deviation?

As the following answer describes: Does pandas/scipy/numpy provide a cumulative standard deviation function? The Python Pandas module contains a method to calculate the running or cumulative standard deviation. For that you'll have to convert your data into a pandas dataframe (or a series if it is 1D), but there are functions for that.

Determine if Python is running inside virtualenv

In windows OS you see something like this:

C:\Users\yourusername\virtualEnvName\Scripts>activate
(virtualEnvName) C:\Users\yourusername\virtualEnvName\Scripts>

Parentheses mean that you are actually in the virtual environment called "virtualEnvName".

time delayed redirect?

 <script type="text/JavaScript">
      setTimeout("location.href = 'http://www.your_site.com';",1500);
 </script>

Add an index (numeric ID) column to large data frame

Using alternative dplyr package:

library("dplyr") # or library("tidyverse")

df <- df %>% mutate(id = row_number())

javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"Group")

This is a fix for a pretty niche use case but it gets me each time. If you are using the Eclipse Jaxb generator it creates a file called package-info.

@javax.xml.bind.annotation.XmlSchema(namespace = "blah.xxx.com/em/feed/v2/CommonFeed")
package xxx.blah.mh.domain.pl3xx.startstop;

If you delete this file it will allow a more generic xml to be parsed. Give it a try!

npm check and update package if needed

To really update just one package install NCU and then run it just for that package. This will bump to the real latest.

npm install -g npm-check-updates

ncu -f your-intended-package-name -u

Unknown URL content://downloads/my_downloads

For those who are getting Error Unknown URI: content://downloads/public_downloads. I managed to solve this by getting a hint given by @Commonsware in this answer. I found out the class FileUtils on GitHub. Here InputStream methods are used to fetch file from Download directory.

 // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);

                if (id != null && id.startsWith("raw:")) {
                    return id.substring(4);
                }

                String[] contentUriPrefixesToTry = new String[]{
                        "content://downloads/public_downloads",
                        "content://downloads/my_downloads",
                        "content://downloads/all_downloads"
                };

                for (String contentUriPrefix : contentUriPrefixesToTry) {
                    Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id));
                    try {
                        String path = getDataColumn(context, contentUri, null, null);
                        if (path != null) {
                            return path;
                        }
                    } catch (Exception e) {}
                }

                // path could not be retrieved using ContentResolver, therefore copy file to accessible cache using streams
                String fileName = getFileName(context, uri);
                File cacheDir = getDocumentCacheDir(context);
                File file = generateFileName(fileName, cacheDir);
                String destinationPath = null;
                if (file != null) {
                    destinationPath = file.getAbsolutePath();
                    saveFileFromUri(context, uri, destinationPath);
                }

                return destinationPath;
            }

How to convert a string into double and vice versa?

from this example here, you can see the the conversions both ways:

NSString *str=@"5678901234567890";

long long verylong;
NSRange range;
range.length = 15;
range.location = 0;

[[NSScanner scannerWithString:[str substringWithRange:range]] scanLongLong:&verylong];

NSLog(@"long long value %lld",verylong);

getting only name of the class Class.getName()

Get simple name instead of path.

String onlyClassName =  this.getLocalClassName(); 

call above method in onCreate

How to get the children of the $(this) selector?

The jQuery constructor accepts a 2nd parameter called context which can be used to override the context of the selection.

jQuery("img", this);

Which is the same as using .find() like this:

jQuery(this).find("img");

If the imgs you desire are only direct descendants of the clicked element, you can also use .children():

jQuery(this).children("img");

Create a date time with month and day only, no year

Well, you can create your own type - but a DateTime always has a full date and time. You can't even have "just a date" using DateTime - the closest you can come is to have a DateTime at midnight.

You could always ignore the year though - or take the current year:

// Consider whether you want DateTime.UtcNow.Year instead
DateTime value = new DateTime(DateTime.Now.Year, month, day);

To create your own type, you could always just embed a DateTime within a struct, and proxy on calls like AddDays etc:

public struct MonthDay : IEquatable<MonthDay>
{
    private readonly DateTime dateTime;

    public MonthDay(int month, int day)
    {
        dateTime = new DateTime(2000, month, day);
    }

    public MonthDay AddDays(int days)
    {
        DateTime added = dateTime.AddDays(days);
        return new MonthDay(added.Month, added.Day);
    }

    // TODO: Implement interfaces, equality etc
}

Note that the year you choose affects the behaviour of the type - should Feb 29th be a valid month/day value or not? It depends on the year...

Personally I don't think I would create a type for this - instead I'd have a method to return "the next time the program should be run".

How To Get The Current Year Using Vba

Year(Date)

Year(): Returns the year portion of the date argument.
Date: Current date only.

Explanation of both of these functions from here.

Live Video Streaming with PHP

Please note that the below described service is no longer available as it was based on FLV media (Flash)

This project which utilizes the Red5, Flex and PHP for Live Video Streaming and Recording has many features

  1. Stream Live video to the viewers

  2. Record the streams from your cam or other video input devices to the server

  3. Preview the recorded streams and files and thumbnail the frame which you would like to display for the video.

  4. Upload the videos from your computer and convert them to FLV which can be streamed using Red5 .

  5. Choose from any resolutions

  6. Can be plugged to any script

  7. Each website user can have a separate Directory for storing their videos and thumbnails use this link http://code.google.com/p/red5-flex-streamer/

assigning column names to a pandas series

You can also use the .to_frame() method.

If it is a Series, I assume 'Gene' is already the index, and will remain the index after converting it to a DataFrame. The name argument of .to_frame() will name the column.

x = x.to_frame('count')

If you want them both as columns, you can reset the index:

x = x.to_frame('count').reset_index()

How to get javax.comm API?

you can find Java Communications API 2.0 in below link

http://www.java2s.com/Code/Jar/c/Downloadcomm20jar.htm

How to convert column with dtype as object to string in Pandas Dataframe

You could try using df['column'].str. and then use any string function. Pandas documentation includes those like split

Calculate summary statistics of columns in dataframe

describe may give you everything you want otherwise you can perform aggregations using groupby and pass a list of agg functions: http://pandas.pydata.org/pandas-docs/stable/groupby.html#applying-multiple-functions-at-once

In [43]:

df.describe()

Out[43]:

       shopper_num is_martian  number_of_items  count_pineapples
count      14.0000         14        14.000000                14
mean        7.5000          0         3.357143                 0
std         4.1833          0         6.452276                 0
min         1.0000      False         0.000000                 0
25%         4.2500          0         0.000000                 0
50%         7.5000          0         0.000000                 0
75%        10.7500          0         3.500000                 0
max        14.0000      False        22.000000                 0

[8 rows x 4 columns]

Note that some columns cannot be summarised as there is no logical way to summarise them, for instance columns containing string data

As you prefer you can transpose the result if you prefer:

In [47]:

df.describe().transpose()

Out[47]:

                 count      mean       std    min   25%  50%    75%    max
shopper_num         14       7.5    4.1833      1  4.25  7.5  10.75     14
is_martian          14         0         0  False     0    0      0  False
number_of_items     14  3.357143  6.452276      0     0    0    3.5     22
count_pineapples    14         0         0      0     0    0      0      0

[4 rows x 8 columns]

Switch statement: must default be the last case?

It's valid and very useful in some cases.

Consider the following code:

switch(poll(fds, 1, 1000000)){
   default:
    // here goes the normal case : some events occured
   break;
   case 0:
    // here goes the timeout case
   break;
   case -1:
     // some error occurred, you have to check errno
}

The point is that the above code is more readable and efficient than cascaded if. You could put default at the end, but it is pointless as it will focus your attention on error cases instead of normal cases (which here is the default case).

Actually, it's not such a good example, in poll you know how many events may occur at most. My real point is that there are cases with a defined set of input values where there are 'exceptions' and normal cases. If it's better to put exceptions or normal cases at front is a matter of choice.

In software field I think of another very usual case: recursions with some terminal values. If you can express it using a switch, default will be the usual value that contains recursive call and distinguished elements (individual cases) the terminal values. There is usually no need to focus on terminal values.

Another reason is that the order of the cases may change the compiled code behavior, and that matters for performances. Most compilers will generate compiled assembly code in the same order as the code appears in the switch. That makes the first case very different from the others: all cases except the first one will involve a jump and that will empty processor pipelines. You may understand it like branch predictor defaulting to running the first appearing case in the switch. If a case if much more common that the others then you have very good reasons to put it as the first case.

Reading comments it's the specific reason why the original poster asked that question after reading Intel compiler Branch Loop reorganisation about code optimisation.

Then it will become some arbitration between code readability and code performance. Probably better to put a comment to explain to future reader why a case appears first.

On select change, get data attribute value

this works for me

<select class="form-control" id="foo">
    <option value="first" data-id="1">first</option>
    <option value="second" data-id="2">second</option>
</select>

and the script

$('#foo').on("change",function(){
    var dataid = $("#foo option:selected").attr('data-id');
    alert(dataid)
});

Angular 6: How to set response type as text while making http call

To get rid of error:

Type '"text"' is not assignable to type '"json"'.

Use

responseType: 'text' as 'json'

import { HttpClient, HttpHeaders } from '@angular/common/http';
.....
 return this.http
        .post<string>(
            this.baseUrl + '/Tickets/getTicket',
            JSON.stringify(value),
        { headers, responseType: 'text' as 'json' }
        )
        .map(res => {
            return res;
        })
        .catch(this.handleError);

How should I store GUID in MySQL tables?

I would store it as a char(36).

Distinct pair of values SQL

What you mean is either

SELECT DISTINCT a, b FROM pairs;

or

SELECT a, b FROM pairs GROUP BY a, b;

If hasClass then addClass to parent

If anyone is using WordPress, you can use something like:

if (jQuery('.dropdown-menu li').hasClass('active')) {
    jQuery('.current-menu-parent').addClass('current-menu-item');
}

Determine number of pages in a PDF file

You'll need a PDF API for C#. iTextSharp is one possible API, though better ones might exist.

iTextSharp Example

You must install iTextSharp.dll as a reference. Download iTextsharp from SourceForge.net This is a complete working program using a console application.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using iTextSharp.text.pdf;
using iTextSharp.text.xml;
namespace GetPages_PDF
{
  class Program
{
    static void Main(string[] args)
      {
       // Right side of equation is location of YOUR pdf file
        string ppath = "C:\\aworking\\Hawkins.pdf";
        PdfReader pdfReader = new PdfReader(ppath);
        int numberOfPages = pdfReader.NumberOfPages;
        Console.WriteLine(numberOfPages);
        Console.ReadLine();
      }
   }
}

No mapping found for HTTP request with URI [/WEB-INF/pages/apiForm.jsp]

What you need is to have a controller that responds to the url first which then renders your jsp. See this link for a solution.

Link a photo with the cell in excel

Hold down the Alt key and drag the pictures to snap to the upper left corner of the cell.

Format the picture and in the Properties tab select "Move but don't size with cells"

Now you can sort the data table by any column and the pictures will stay with the respective data.

This post at SuperUser has a bit more background and screenshots: https://superuser.com/questions/712622/put-an-equation-object-in-an-excel-cell/712627#712627

What is the difference between "expose" and "publish" in Docker?

See the official documentation reference: https://docs.docker.com/engine/reference/builder/#expose

The EXPOSE allow you to define private (container) and public (host) ports to expose at image build time for when the container is running if you run the container with -P.

$ docker help run
...
  -P, --publish-all                    Publish all exposed ports to random ports
...

The public port and protocol are optional, if not a public port is specified, a random port will be selected on host by docker to expose the specified container port on Dockerfile.

A good pratice is do not specify public port, because it limits only one container per host ( a second container will throw a port already in use ).

You can use -p in docker run to control what public port the exposed container ports will be connectable.

Anyway, If you do not use EXPOSE (with -P on docker run) nor -p, no ports will be exposed.

If you always use -p at docker run you do not need EXPOSE but if you use EXPOSE your docker run command may be more simple, EXPOSE can be useful if you don't care what port will be expose on host, or if you are sure of only one container will be loaded.

php & mysql query not echoing in html with tags?

You need to append your variables to the echoed string. For example:

echo 'This is a string '.$PHPvariable.' and this is more string'; 

Remove decimal values using SQL query

First of all, you tried to replace the entire 12.00 with '', which isn't going to give your desired results.

Second you are trying to do replace directly on a decimal. Replace must be performed on a string, so you have to CAST.

There are many ways to get your desired results, but this replace would have worked (assuming your column name is "height":

REPLACE(CAST(height as varchar(31)),'.00','')

EDIT:

This script works:

DECLARE @Height decimal(6,2);
SET @Height = 12.00;
SELECT @Height, REPLACE(CAST(@Height AS varchar(31)),'.00','');

How can I set size of a button?

Try with setPreferredSize instead of setSize.

UPDATE: GridLayout take up all space in its container, and BoxLayout seams to take up all the width in its container, so I added some glue-panels that are invisible and just take up space when the user stretches the window. I have just done this horizontally, and not vertically, but you could implement that in the same way if you want it.

Since GridLayout make all cells in the same size, it doesn't matter if they have a specified size. You have to specify a size for its container instead, as I have done.

import javax.swing.*;
import java.awt.*;

public class PanelModel {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Colored Trails");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));

        JPanel firstPanel = new JPanel(new GridLayout(4, 4));
        firstPanel.setPreferredSize(new Dimension(4*100, 4*100));
        for (int i=1; i<=4; i++) {
            for (int j=1; j<=4; j++) {
                firstPanel.add(new JButton());
            }
        }

        JPanel firstGluePanel = new JPanel(new BorderLayout());
        firstGluePanel.add(firstPanel, BorderLayout.WEST);
        firstGluePanel.add(Box.createHorizontalGlue(), BorderLayout.CENTER);
        firstGluePanel.add(Box.createVerticalGlue(), BorderLayout.SOUTH);

        JPanel secondPanel = new JPanel(new GridLayout(13, 5));
        secondPanel.setPreferredSize(new Dimension(5*40, 13*40));
        for (int i=1; i<=5; i++) {
            for (int j=1; j<=13; j++) {
                secondPanel.add(new JButton());
            }
        }

        JPanel secondGluePanel = new JPanel(new BorderLayout());
        secondGluePanel.add(secondPanel, BorderLayout.WEST);
        secondGluePanel.add(Box.createHorizontalGlue(), BorderLayout.CENTER);
        secondGluePanel.add(Box.createVerticalGlue(), BorderLayout.SOUTH);

        mainPanel.add(firstGluePanel);
        mainPanel.add(secondGluePanel);
        frame.getContentPane().add(mainPanel);

        //frame.setSize(400,600);
        frame.pack();
        frame.setVisible(true);
    }
}

Pass Method as Parameter using C#

You should use a Func<string, int> delegate, that represents a function taking a string argument and returning an int value:

public bool RunTheMethod(Func<string, int> myMethod)
{
    // Do stuff
    myMethod.Invoke("My String");
    // Do stuff
    return true;
}

Then invoke it this way:

public bool Test()
{
    return RunTheMethod(Method1);
}

How to change an element's title attribute using jQuery

I beleive

$("#myElement").attr("title", "new title value")

or

$("#myElement").prop("title", "new title value")

should do the trick...

I think you can find all the core functions in the jQuery Docs, although I hate the formatting.

Connecting to smtp.gmail.com via command line

Using Linux or OSx, do what Sorin recommended but use port 465 instead. 25 is the generic SMTP port, but not what GMail uses. Also, I don't believe you want to use -starttls smtp

openssl s_client -connect smtp.gmail.com:465

You should get lots of information on the SSL session and the response:

220 mx.google.com ...

Type in

HELO smtp.gmail.com 

and you'll receive:

250 mx.google.com at your service

From there it is not quite as straightforward as just sending SMTP messages because Gmail has protections in place to ensure you only send emails appearing to be from accounts that actually belong to you. Instead of typing in "Helo", use "Ehlo". I don't know much about SMTP so I cannot explain the difference, and don't have time to research much. Perhaps someone with more knowledge can explain.

Then, type "auth login" and you will receive the following:

334 VXNlcm5hbWU6

This is essentially the word "Username" encoded in Base 64. Using a Base 64 encoder such as this one, encode your user name and enter it. Do the same for your password, which is requested next. You should see:

235 2.7.0 Accepted

And that's it, you're logged in.

There is one more oddity to overcome if you're using OSx or Linux terminals. Just pressing the "ENTER" key does not apparently result in a CRLF which SMTP needs to end a message. You have to use "CTRL+V+ENTER". So, this should look like the following:

^M
.^M
250 2.0.0 OK

Warning: mysql_connect(): [2002] No such file or directory (trying to connect via unix:///tmp/mysql.sock) in

When you face the following issue:

PHP throwing error "Warning: mysql_connect() http://function.mysql-connect: 2002 No such file or directory (trying to connect via unix:///tmp/mysql.sock)"

Set "mysql.default_socket" value in your /etc/php.ini to

 "mysql.default_socket = /var/mysql/mysql.sock". 

Then restart web service in server admin

remove script tag from HTML content

function remove_script_tags($html){
    $dom = new DOMDocument();
    $dom->loadHTML($html);
    $script = $dom->getElementsByTagName('script');

    $remove = [];
    foreach($script as $item){
        $remove[] = $item;
    }

    foreach ($remove as $item){
        $item->parentNode->removeChild($item);
    }

    $html = $dom->saveHTML();
    $html = preg_replace('/<!DOCTYPE.*?<html>.*?<body><p>/ims', '', $html);
    $html = str_replace('</p></body></html>', '', $html);
    return $html;
}

Dejan's answer was good, but saveHTML() adds unnecessary doctype and body tags, this should get rid of it. See https://3v4l.org/82FNP

I keep getting this error for my simple python program: "TypeError: 'float' object cannot be interpreted as an integer"

Also possible is to fix this with np.arange() instead of range which works for float numbers:

import numpy as np
for i in np.arange(c/10):

Efficiently updating database using SQLAlchemy ORM

If it is because of the overhead in terms of creating objects, then it probably can't be sped up at all with SA.

If it is because it is loading up related objects, then you might be able to do something with lazy loading. Are there lots of objects being created due to references? (IE, getting a Company object also gets all of the related People objects).

Html code as IFRAME source rather than a URL

I have a page it loads an HTML body from MYSQL I want to present that code in a frame so it renders it self independent of the rest of the page and in the confines of that specific bordering.

An object with a unencoded dataUri might have also fit your need if it was only to load a portion of data text:

The HTML <object> element represents an external resource, which can be treated as an image, a nested browsing context, or a resource to be handled by a plugin.

_x000D_
_x000D_
body {display:flex;min-height:25em;}
p {margin:auto;}
object {margin:0 auto;background:lightgray;}
_x000D_
<p>here My uploaded content: </p>
<object data='data:text/html,
  <style>

.table {
  display: table;
  text-align:center;
  width:100%;
  height:100%;
}

.table > * {
  display: table-row;
}

.table > main {
  display: table-cell;
  height: 100%;
  vertical-align: middle;
}
</style>


<div class="table">
  <header>
    <h1>Title</h1>
    <p>subTitle</p>
  </header>

  <main>
    <p>Collection</p>
    <p>Version</p>
    <p>Id</p>
  </main>

  <footer>
    <p>Edition</p>
  </footer>'>

</object>
_x000D_
_x000D_
_x000D_

But keeping your Iframe idea, You could also load your HTML inside your iframe tag and set it as the srcdoc value.You should not have to mind about quotes nor turning it into a dataUri but only mind to fire onload once.

The HTML Inline Frame element (<iframe>) represents a nested browsing context, embedding another HTML page into the current one.

Both iframe below will render the same, one require extra javascript.

example loading a full document :

_x000D_
_x000D_
body {
  display: flex;
  min-height: 25em;
}

p {
  margin: auto;
}

iframe {
  margin: 0 auto;
  min-height: 100%;
  background:lightgray;
}
_x000D_
<p>here my uploaded contents =>:</p>
  <iframe srcdoc='<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title></title>
  <style>
html, body {
  height: 100%;
  margin:0;
}

body.table {
  display: table;
  text-align:center;
  width:100%;
}

.table > * {
  display: table-row;
}

.table > main {
  display: table-cell;
  height: 100%;
  vertical-align: middle;
}
</style>
</head>

<body class="table">
  <header>
    <h1>title</h1>
    <p>injected via <code>srcdoc</code></p>
  </header>

  <main>
    <p>Collection</p>
    <p>Version</p>
    <p>Id</p>
  </main>

  <footer>
    <p>Edition</p>
  </footer>
</body>
</html>'>

</iframe>

  <iframe onload="this.setAttribute('srcdoc', this.innerHTML);this.setAttribute('onload','')">
    <!-- below html loaded -->
    <?xml version="1.0" encoding="utf-8"?>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
      "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

    <html xmlns="http://www.w3.org/1999/xhtml">

    <head>
      <title>Test</title>
      <style>
        html,
        body {
          height: 100%;
          margin: 0;
          overflow:auto;
        }
        
        body.table {
          display: table;
          text-align: center;
          width: 100%;
        }
        
        .table>* {
          display: table-row;
        }
        
        .table>main {
          display: table-cell;
          height: 100%;
          vertical-align: middle;
        }
      </style>
    </head>

    <body class="table">
      <header>
        <h1>Title</h1>
        <p>Injected from <code>innerHTML</code></p>
      </header>

      <main>
        <p>Collection</p>
        <p>Version</p>
        <p>Id</p>
      </main>

      <footer>
        <p>Edition</p>
      </footer>
    </body>

    </html>
    </iframe>
_x000D_
_x000D_
_x000D_

Response to preflight request doesn't pass access control check

For anyone using Api Gateway's HTTP API and the proxy route ANY /{proxy+}

You will need to explicitly define your route methods in order for CORS to work.

enter image description here

Wish this was more explicit in the AWS Docs for Configuring CORS for an HTTP API

Was on a 2 hour call with AWS Support and they looped in one of their senior HTTP API developers, who made this recommendation.

Hopefully this post can save some time and effort for those who are working with Api Gateway HTTP API.

"use database_name" command in PostgreSQL

When you get a connection to PostgreSQL it is always to a particular database. To access a different database, you must get a new connection.

Using \c in psql closes the old connection and acquires a new one, using the specified database and/or credentials. You get a whole new back-end process and everything.

How many bytes is unsigned long long?

Use the operator sizeof, it will give you the size of a type expressed in byte. One byte is eight bits. See the following program:

#include <iostream>

int main(int,char**)
{
 std::cout << "unsigned long long " << sizeof(unsigned long long) << "\n";
 std::cout << "unsigned long long int " << sizeof(unsigned long long int) << "\n";
 return 0;
}

What does SQL clause "GROUP BY 1" mean?

That means sql group by 1st column in your select clause, we always use this GROUP BY 1 together with ORDER BY 1, besides you can also use like this GROUP BY 1,2,3.., of course it is convenient for us but you need to pay attention to that condition the result may be not what you want if some one has modified your select columns, and it's not visualized

How do I install the OpenSSL libraries on Ubuntu?

Another way to install openssl library from source code on Ubuntu, follows steps below, here WORKDIR is your working directory:

sudo apt-get install pkg-config
cd WORKDIR
git clone https://github.com/openssl/openssl.git
cd openssl
./config
make
sudo make install
# Open file /etc/ld.so.conf, add a new line: "/usr/local/lib" at EOF
sudo ldconfig

How to remove Left property when position: absolute?

In the future one would use left: unset; for unsetting the value of left.

As of today 4 nov 2014 unset is only supported in Firefox.

Read more about unset in MDN.

My guess is we'll be able to use it around year 2022 when IE 11 is properly phased out.

Safely remove migration In Laravel

DO NOT run php artisan migrate:fresh that's gonna drop all the tables

How to perform .Max() on a property of all objects in a collection and return the object with maximum value

Doing an ordering and then selecting the first item is wasting a lot of time ordering the items after the first one. You don't care about the order of those.

Instead you can use the aggregate function to select the best item based on what you're looking for.

var maxHeight = dimensions
    .Aggregate((agg, next) => 
        next.Height > agg.Height ? next : agg);

var maxHeightAndWidth = dimensions
    .Aggregate((agg, next) => 
        next.Height >= agg.Height && next.Width >= agg.Width ? next: agg);

Reverse HashMap keys and values in Java

I wrote a simpler loop that works too (note that all my values are unique):

HashMap<Character, String> myHashMap = new HashMap<Character, String>();
HashMap<String, Character> reversedHashMap = new HashMap<String, Character>();

for (char i : myHashMap.keySet()) {
    reversedHashMap.put(myHashMap.get(i), i);
}

How to install APK from PC?

Just connect the device to the PC with a USB cable, then copy the .apk file to the device. On the device, touch the APK file in the file explorer to install it.

You could also offer the .apk on your website. People can download it, then touch it to install.

npm - EPERM: operation not permitted on Windows

Find this command npm cache clean as a solution to those error in quick and simple way!

E11000 duplicate key error index in mongodb mongoose

Check collection indexes.

I had that issue due to outdated indexes in collection for fields, which should be stored by different new path.

Mongoose adds index, when you specify field as unique.

Prevent Default on Form Submit jQuery

Hello sought a solution to make an Ajax form work with Google Tag Manager (GTM), the return false prevented the completion and submit the activation of the event in real time on google analytics solution was to change the return false by e.preventDefault (); that worked correctly follows the code:

 $("#Contact-Form").submit(function(e) {
    e.preventDefault();
   ...
});

Static variable inside of a function in C

The output will be 6 7. A static variable (whether inside a function or not) is initialized exactly once, before any function in that translation unit executes. After that, it retains its value until modified.

Why is this rsync connection unexpectedly closed on Windows?

This error message probably means that you either mistyped the server name or forgot to start an ssh server at server. Make absolutely certain that an ssh server is running on the server at port 22, and that it's not firewalled. You can test that with ssh user@server.

What's the difference between .so, .la and .a library files?

.so files are dynamic libraries. The suffix stands for "shared object", because all the applications that are linked with the library use the same file, rather than making a copy in the resulting executable.

.a files are static libraries. The suffix stands for "archive", because they're actually just an archive (made with the ar command -- a predecessor of tar that's now just used for making libraries) of the original .o object files.

.la files are text files used by the GNU "libtools" package to describe the files that make up the corresponding library. You can find more information about them in this question: What are libtool's .la file for?

Static and dynamic libraries each have pros and cons.

Static pro: The user always uses the version of the library that you've tested with your application, so there shouldn't be any surprising compatibility problems.

Static con: If a problem is fixed in a library, you need to redistribute your application to take advantage of it. However, unless it's a library that users are likely to update on their own, you'd might need to do this anyway.

Dynamic pro: Your process's memory footprint is smaller, because the memory used for the library is amortized among all the processes using the library.

Dynamic pro: Libraries can be loaded on demand at run time; this is good for plugins, so you don't have to choose the plugins to be used when compiling and installing the software. New plugins can be added on the fly.

Dynamic con: The library might not exist on the system where someone is trying to install the application, or they might have a version that's not compatible with the application. To mitigate this, the application package might need to include a copy of the library, so it can install it if necessary. This is also often mitigated by package managers, which can download and install any necessary dependencies.

Dynamic con: Link-Time Optimization is generally not possible, so there could possibly be efficiency implications in high-performance applications. See the Wikipedia discussion of WPO and LTO.

Dynamic libraries are especially useful for system libraries, like libc. These libraries often need to include code that's dependent on the specific OS and version, because kernel interfaces have changed. If you link a program with a static system library, it will only run on the version of the OS that this library version was written for. But if you use a dynamic library, it will automatically pick up the library that's installed on the system you run on.

Best Way to do Columns in HTML/CSS

You also have CSS Grid and CSS Flex, both can give you columns that keep their position and size ratios depending on screen size, and flex can also easily rearrange the columns if screen size is too small so they can maintain a minimum width nicely.

See these guides for full details:

Grid:

.container {
  display: grid | inline-grid;
}

Flex:

.container {
  display: flex | inline-flex;
}

Circular (or cyclic) imports in Python

I completely agree with pythoneer's answer here. But I have stumbled on some code that was flawed with circular imports and caused issues when trying to add unit tests. So to quickly patch it without changing everything you can resolve the issue by doing a dynamic import.

# Hack to import something without circular import issue
def load_module(name):
    """Load module using imp.find_module"""
    names = name.split(".")
    path = None
    for name in names:
        f, path, info = imp.find_module(name, path)
        path = [path]
    return imp.load_module(name, f, path[0], info)
constants = load_module("app.constants")

Again, this isn't a permanent fix but may help someone that wants to fix an import error without changing too much of the code.

Cheers!

BadValue Invalid or no user locale set. Please ensure LANG and/or LC_* environment variables are set correctly

adding the following lines to my /etc/environment file worked

LC_ALL=en_US.UTF-8
LANG=en_US.UTF-8

Is it possible to return empty in react render function?

We can return like this,

return <React.Fragment />;

Is Python interpreted, or compiled, or both?

According to the official Python site, it's interpreted.

https://www.python.org/doc/essays/blurb/

Python is an interpreted, object-oriented, high-level programming language...

...

Since there is no compilation step ...

...

The Python interpreter and the extensive standard library are available...

...

Instead, when the interpreter discovers an error, it raises an exception. When the program doesn't catch the exception, the interpreter prints a stack trace.

Ternary operator in AngularJS templates

This answer predates version 1.1.5 where a proper ternary in the $parse function wasn't available. Use this answer if you're on a lower version, or as an example of filters:

angular.module('myApp.filters', [])
  
  .filter('conditional', function() {
    return function(condition, ifTrue, ifFalse) {
      return condition ? ifTrue : ifFalse;
    };
  });

And then use it as

<i ng-class="checked | conditional:'icon-check':'icon-check-empty'"></i>

JFrame background image

The best way to load an image is through the ImageIO API

BufferedImage img = ImageIO.read(new File("/path/to/some/image"));

There are a number of ways you can render an image to the screen.

You could use a JLabel. This is the simplest method if you don't want to modify the image in anyway...

JLabel background = new JLabel(new ImageIcon(img));

Then simply add it to your window as you see fit. If you need to add components to it, then you can simply set the label's layout manager to whatever you need and add your components.

If, however, you need something more sophisticated, need to change the image somehow or want to apply additional effects, you may need to use custom painting.

First cavert: Don't ever paint directly to a top level container (like JFrame). Top level containers aren't double buffered, so you may end up with some flashing between repaints, other objects live on the window, so changing it's paint process is troublesome and can cause other issues and frames have borders which are rendered inside the viewable area of the window...

Instead, create a custom component, extending from something like JPanel. Override it's paintComponent method and render your output to it, for example...

protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawImage(img, 0, 0, this);
}

Take a look at Performing Custom Painting and 2D Graphics for more details

Selecting distinct values from a JSON

This is a great spot for a reduce

var uniqueArray = o.DATA.reduce(function (a, d) {
       if (a.indexOf(d.name) === -1) {
         a.push(d.name);
       }
       return a;
    }, []);

Adding click event listener to elements with the same class

The problem with using querySelectorAll and a for loop is that it creates a whole new event handler for each element in the array.

Sometimes that is exactly what you want. But if you have many elements, it may be more efficient to create a single event handler and attach it to a container element. You can then use event.target to refer to the specific element which triggered the event:

document.body.addEventListener("click", function (event) {
  if (event.target.classList.contains("delete")) {
    var title = event.target.getAttribute("title");

    if (!confirm("sure u want to delete " + title)) {
      event.preventDefault();
    }
  }
});

In this example we only create one event handler which is attached to the body element. Whenever an element inside the body is clicked, the click event bubbles up to our event handler.

How to make rectangular image appear circular with CSS

Following worked for me:

CSS

.round {
  border-radius: 50%;
  overflow: hidden;
  width: 30px;
  height: 30px;
  background: no-repeat 50%;
  object-fit: cover;
}
.round img {
   display: block;
   height: 100%;
   width: 100%;
}

HTML

<div class="round">
   <img src="test.png" />
</div>

jQuery: Return data after ajax call success

See jquery docs example: http://api.jquery.com/jQuery.ajax/ (about 2/3 the page)

You may be looking for following code:

    $.ajax({
     url: 'ajax/test.html',
     success: function(data) {
     $('.result').html(data);
     alert('Load was performed.');
   }
});

Same page...lower down.

How to concatenate properties from multiple JavaScript objects

ES6 ++

The question is adding various different objects into one.

let obj = {};
const obj1 = { foo: 'bar' };
const obj2 = { bar: 'foo' };
Object.assign(obj, obj1, obj2);
//output => {foo: 'bar', bar: 'foo'};

lets say you have one object with multiple keys that are objects:

let obj = {
  foo: { bar: 'foo' },
  bar: { foo: 'bar' }
}

this was the solution I found (still have to foreach :/)

let objAll = {};

Object.values(obj).forEach(o => {
  objAll = {...objAll, ...o};
});

By doing this we can dynamically add ALL object keys into one.

// Output => { bar: 'foo', foo: 'bar' }

I am not able launch JNLP applications using "Java Web Start"?

I was also facing the same problem. To fix this to the following steps.

  1. open Javaws from cmd runnig javaws -viewer command. A new window will open
  2. Select the jnlp file which you want and click the run button.
  3. Close the javaws viewer window.

C# Copy a file to another location with a different name

StreamReader reader = new StreamReader(Oldfilepath);
string fileContent = reader.ReadToEnd();

StreamWriter writer = new StreamWriter(NewFilePath);
writer.Write(fileContent);

How do I convert an interval into a number of hours with postgres?

         select date 'now()' - date '1955-12-15';

Here is the simple query which calculates total no of days.

Bootstrap table without stripe / borders

This one worked for me.

<td style="border-top: none;">;

The key is you need to add border-top to the <td>

Start/Stop and Restart Jenkins service on Windows

To start Jenkins from command line

  1. Open command prompt
  2. Go to the directory where your war file is placed and run the following command:

    java -jar jenkins.war

To stop

Ctrl + C

Android: Flush DNS

copied from: https://android.stackexchange.com/questions/12962/flush-clear-dns-cache

Addresses are cached for 600 seconds (10 minutes) by default. Failed lookups are cached for 10 seconds. From everything I've seen, there's nothing built in to flush the cache. This is apparently a reported bug http://code.google.com/p/android/issues/detail?id=7904 in Android because of the way it stores DNS cache. Clearing the browser cache doesn't touch the DNS, the "hard reset" clears it.

ReferenceError: Invalid left-hand side in assignment

Common reasons for the error:

  • use of assignment (=) instead of equality (==/===)
  • assigning to result of function foo() = 42 instead of passing arguments (foo(42))
  • simply missing member names (i.e. assuming some default selection) : getFoo() = 42 instead of getFoo().theAnswer = 42 or array indexing getArray() = 42 instead of getArray()[0]= 42

In this particular case you want to use == (or better === - What exactly is Type Coercion in Javascript?) to check for equality (like if(one === "rock" && two === "rock"), but it the actual reason you are getting the error is trickier.

The reason for the error is Operator precedence. In particular we are looking for && (precedence 6) and = (precedence 3).

Let's put braces in the expression according to priority - && is higher than = so it is executed first similar how one would do 3+4*5+6 as 3+(4*5)+6:

 if(one= ("rock" && two) = "rock"){...

Now we have expression similar to multiple assignments like a = b = 42 which due to right-to-left associativity executed as a = (b = 42). So adding more braces:

 if(one= (  ("rock" && two) = "rock" )  ){...

Finally we arrived to actual problem: ("rock" && two) can't be evaluated to l-value that can be assigned to (in this particular case it will be value of two as truthy).

Note that if you'd use braces to match perceived priority surrounding each "equality" with braces you get no errors. Obviously that also producing different result than you'd expect - changes value of both variables and than do && on two strings "rock" && "rock" resulting in "rock" (which in turn is truthy) all the time due to behavior of logial &&:

if((one = "rock") && (two = "rock"))
{
   // always executed, both one and two are set to "rock"
   ...
}

For even more details on the error and other cases when it can happen - see specification:

Assignment

LeftHandSideExpression = AssignmentExpression
...
Throw a SyntaxError exception if the following conditions are all true:
...
IsStrictReference(lref) is true

Left-Hand-Side Expressions

and The Reference Specification Type explaining IsStrictReference:

... function calls are permitted to return references. This possibility is admitted purely for the sake of host objects. No built-in ECMAScript function defined by this specification returns a reference and there is no provision for a user-defined function to return a reference...

Check if a string is not NULL or EMPTY

You don't necessarily have to use the [string]:: prefix. This works in the same way:

if ($version)
{
    $request += "/" + $version
}

A variable that is null or empty string evaluates to false.

How to obtain the absolute path of a file via Shell (BASH/ZSH/SH)?

There is generally no such thing as the absolute path to a file (this statement means that there may be more than one in general, hence the use of the definite article the is not appropriate). An absolute path is any path that start from the root "/" and designates a file without ambiguity independently of the working directory.(see for example wikipedia).

A relative path is a path that is to be interpreted starting from another directory. It may be the working directory if it is a relative path being manipulated by an application (though not necessarily). When it is in a symbolic link in a directory, it is generally intended to be relative to that directory (though the user may have other uses in mind).

Hence an absolute path is just a path relative to the root directory.

A path (absolute or relative) may or may not contain symbolic links. If it does not, it is also somewhat impervious to changes in the linking structure, but this is not necessarily required or even desirable. Some people call canonical path ( or canonical file name or resolved path) an absolute path in which all symbolic links have been resolved, i.e. have been replaced by a path to whetever they link to. The commands realpath and readlink both look for a canonical path, but only realpath has an option for getting an absolute path without bothering to resolve symbolic links (along with several other options to get various kind of paths, absolute or relative to some directory).

This calls for several remarks:

  1. symbolic links can only be resolved if whatever they are supposed to link to is already created, which is obviously not always the case. The commands realpath and readlink have options to account for that.
  2. a directory on a path can later become a symbolic link, which means that the path is no longer canonical. Hence the concept is time (or environment) dependent.
  3. even in the ideal case, when all symbolic links can be resolved, there may still be more than one canonical path to a file, for two reasons:
    • the partition containing the file may have been mounted simultaneously (ro) on several mount points.
    • there may be hard links to the file, meaning essentially the the file exists in several different directories.

Hence, even with the much more restrictive definition of canonical path, there may be several canonical paths to a file. This also means that the qualifier canonical is somewhat inadequate since it usually implies a notion of uniqueness.

This expands a brief discussion of the topic in an answer to another similar question at Bash: retrieve absolute path given relative

My conclusion is that realpath is better designed and much more flexible than readlink. The only use of readlink that is not covered by realpath is the call without option returning the value of a symbolic link.

What is the default username and password in Tomcat?

My answer is tested on Windows 7 with installation of NetBeans IDE 6.9.1 which has bundled Tomcat version 6.0.26. The instruction may work with other tomcat versions according to my opinion.

If you are starting the Apache Tomcat server from the Servers panel in NetBeans IDE then you shall know that the Catalina base and config files used by NetBeans IDE to start the Tomcat server are kept at a different location.

Steps to know the catalina base directory for your installation:

  1. Right click on the Apache Tomcat node in Servers panel and choose properties option in the context menu. This will open a dialog box named Servers.
  2. Check the directory name of the field Catalina Base, this is that directory where the current conf/tomcat-users.xml is located and which you want to open and read.
    (In my case it is C:\Users\Tushar Joshi\.netbeans\6.9\apache-tomcat-6.0.26_base )
  3. Open this directory in My Computer and go to the conf directory where you will find the actual tomcat-users.xml file used by NetBeans IDE. NetBeans IDE comes configured with one default password with username="ide" and some random password, you may change this username and password if you want or use it for your login also
  4. This dialog box also have username and password field which are populated with these default username and password and NetBeans IDE also offers you to open the manager application by right clicking on the manager node under the Apache Tomcat node in Servers panel
  5. The only problem with the NetBeans IDE is it tries to open the URL http://localhost:8084/manager/ which shall be http://localhost:8084/manager/html now

Download image from the site in .NET/C#

There is no need to involve any image classes, you can simply call WebClient.DownloadFile:

string localFilename = @"c:\localpath\tofile.jpg";
using(WebClient client = new WebClient())
{
    client.DownloadFile("http://www.example.com/image.jpg", localFilename);
}

Update
Since you will want to check whether the file exists and download the file if it does, it's better to do this within the same request. So here is a method that will do that:

private static void DownloadRemoteImageFile(string uri, string fileName)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

    // Check that the remote file was found. The ContentType
    // check is performed since a request for a non-existent
    // image file might be redirected to a 404-page, which would
    // yield the StatusCode "OK", even though the image was not
    // found.
    if ((response.StatusCode == HttpStatusCode.OK || 
        response.StatusCode == HttpStatusCode.Moved || 
        response.StatusCode == HttpStatusCode.Redirect) &&
        response.ContentType.StartsWith("image",StringComparison.OrdinalIgnoreCase))
    {

        // if the remote file was found, download oit
        using (Stream inputStream = response.GetResponseStream())
        using (Stream outputStream = File.OpenWrite(fileName))
        {
            byte[] buffer = new byte[4096];
            int bytesRead;
            do
            {
                bytesRead = inputStream.Read(buffer, 0, buffer.Length);
                outputStream.Write(buffer, 0, bytesRead);
            } while (bytesRead != 0);
        }
    }
}

In brief, it makes a request for the file, verifies that the response code is one of OK, Moved or Redirect and also that the ContentType is an image. If those conditions are true, the file is downloaded.

can you add HTTPS functionality to a python flask web server?

The top-scoring answer has the right idea, but the API seems to have evolved so that it no longer works as when it was first written, in 2015.

In place of this:

from OpenSSL import SSL
context = SSL.Context(SSL.PROTOCOL_TLSv1_2)
context.use_privatekey_file('server.key')
context.use_certificate_file('server.crt')

I used this, with Python 3.7.5:

import ssl
context = ssl.SSLContext()
context.load_cert_chain('fullchain.pem', 'privkey.pem')

and then supplied the SSL context in the Flask.run call as it said:

app.run(…, ssl_context=context)

(My server.crt file is called fullchain.pem and my server.key is called privkey.pem. These files were supplied to me by my LetsEncrypt Certbot.)

Bootstrap 3 collapse accordion: collapse all works but then cannot expand all while maintaining data-parent

To keep the accordion nature intact when wanting to also use 'hide' and 'show' functions like .collapse( 'hide' ), you must initialize the collapsible panels with the parent property set in the object with toggle: false before making any calls to 'hide' or 'show'

// initialize collapsible panels
$('#accordion .collapse').collapse({
  toggle: false,
  parent: '#accordion'
});

// show panel one (will collapse others in accordion)
$( '#collapseOne' ).collapse( 'show' );

// show panel two (will collapse others in accordion)
$( '#collapseTwo' ).collapse( 'show' );

// hide panel two (will not collapse/expand others in accordion)
$( '#collapseTwo' ).collapse( 'hide' );