Programs & Examples On #User location

Good way of getting the user's location in Android

Location accuracy depends mostly on the location provider used:

  1. GPS - will get you several meters accuracy (assuming you have GPS reception)
  2. Wifi - Will get you few hundred meters accuracy
  3. Cell Network - Will get you very inaccurate results (I've seen up to 4km deviation...)

If it's accuracy you are looking for, then GPS is your only option.

I've read a very informative article about it here.

As for the GPS timeout - 60 seconds should be sufficient, and in most cases even too much. I think 30 seconds is OK and sometimes even less than 5 sec...

if you only need a single location, I'd suggest that in your onLocationChanged method, once you receive an update you'll unregister the listener and avoid unnecessary usage of the GPS.

plotting different colors in matplotlib

Joe Kington's excellent answer is already 4 years old, Matplotlib has incrementally changed (in particular, the introduction of the cycler module) and the new major release, Matplotlib 2.0.x, has introduced stylistic differences that are important from the point of view of the colors used by default.

The color of individual lines

The color of individual lines (as well as the color of different plot elements, e.g., markers in scatter plots) is controlled by the color keyword argument,

plt.plot(x, y, color=my_color)

my_color is either

The color cycle

By default, different lines are plotted using different colors, that are defined by default and are used in a cyclic manner (hence the name color cycle).

The color cycle is a property of the axes object, and in older releases was simply a sequence of valid color names (by default a string of one character color names, "bgrcmyk") and you could set it as in

my_ax.set_color_cycle(['kbkykrkg'])

(as noted in a comment this API has been deprecated, more on this later).

In Matplotlib 2.0 the default color cycle is ["#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd", "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"], the Vega category10 palette.

enter image description here

(the image is a screenshot from https://vega.github.io/vega/docs/schemes/)

The cycler module: composable cycles

The following code shows that the color cycle notion has been deprecated

In [1]: from matplotlib import rc_params

In [2]: rc_params()['axes.color_cycle']
/home/boffi/lib/miniconda3/lib/python3.6/site-packages/matplotlib/__init__.py:938: UserWarning: axes.color_cycle is deprecated and replaced with axes.prop_cycle; please use the latter.
  warnings.warn(self.msg_depr % (key, alt_key))
Out[2]: 
['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd',
 '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf']

Now the relevant property is the 'axes.prop_cycle'

In [3]: rc_params()['axes.prop_cycle']
Out[3]: cycler('color', ['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd', '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf'])

Previously, the color_cycle was a generic sequence of valid color denominations, now by default it is a cycler object containing a label ('color') and a sequence of valid color denominations. The step forward with respect to the previous interface is that it is possible to cycle not only on the color of lines but also on other line attributes, e.g.,

In [5]: from cycler import cycler

In [6]: new_prop_cycle = cycler('color', ['k', 'r']) * cycler('linewidth', [1., 1.5, 2.])

In [7]: for kwargs in new_prop_cycle: print(kwargs)
{'color': 'k', 'linewidth': 1.0}
{'color': 'k', 'linewidth': 1.5}
{'color': 'k', 'linewidth': 2.0}
{'color': 'r', 'linewidth': 1.0}
{'color': 'r', 'linewidth': 1.5}
{'color': 'r', 'linewidth': 2.0}

As you have seen, the cycler objects are composable and when you iterate on a composed cycler what you get, at each iteration, is a dictionary of keyword arguments for plt.plot.

You can use the new defaults on a per axes object ratio,

my_ax.set_prop_cycle(new_prop_cycle)

or you can install temporarily the new default

plt.rc('axes', prop_cycle=new_prop_cycle)

or change altogether the default editing your .matplotlibrc file.

Last possibility, use a context manager

with plt.rc_context({'axes.prop_cycle': new_prop_cycle}):
    ...

to have the new cycler used in a group of different plots, reverting to defaults at the end of the context.

The doc string of the cycler() function is useful, but the (not so much) gory details about the cycler module and the cycler() function, as well as examples, can be found in the fine docs.

React Js conditionally applying class attributes

You can use here String literals

const Angle = ({show}) => {

   const angle = `fa ${show ? 'fa-angle-down' : 'fa-angle-right'}`;

   return <i className={angle} />
}

Changing iframe src with Javascript

change onselect to onchange in inputs and use

calendar.src = loc

_x000D_
_x000D_
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">_x000D_
<html xmlns="http://www.w3.org/1999/xhtml">_x000D_
_x000D_
<head>_x000D_
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />_x000D_
  <title>Untitled 1</title>_x000D_
_x000D_
  <script>_x000D_
  function go(loc) {_x000D_
    calendar.src = loc;_x000D_
  }_x000D_
  </script>_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <iframe id="calendar" src="about:blank" width="1000" height="450" frameborder="0" scrolling="no"></iframe>_x000D_
_x000D_
  <form method="post">_x000D_
    <input name="calendarSelection" type="radio" onchange="go('https://calendar.zoho.com/embed/9a6054c98fd2ad4047021cff76fee38773c34a35234fa42d426b9510864356a68cabcad57cbbb1a0?title=Kevin_Calendar&type=1&l=en&tz=America/Los_Angeles&sh=[0,0]&v=1')" />Day_x000D_
    <input name="calendarSelection" type="radio" onchange="go('https://calendar.zoho.com/embed/9a6054c98fd2ad4047021cff76fee38773c34a35234fa42d426b9510864356a68cabcad57cbbb1a0?title=Kevin_Calendar&type=1&l=en&tz=America/Los_Angeles&sh=[0,0]&v=1')" />Week_x000D_
    <input name="calendarSelection" type="radio" onchange="go('https://calendar.zoho.com/embed/9a6054c98fd2ad4047021cff76fee38773c34a35234fa42d426b9510864356a68cabcad57cbbb1a0?title=Kevin_Calendar&type=1&l=en&tz=America/Los_Angeles&sh=[0,0]&v=1')" />Month_x000D_
  </form>_x000D_
_x000D_
</body>_x000D_
_x000D_
</html>
_x000D_
_x000D_
_x000D_

VB.NET 'If' statement with 'Or' conditional has both sides evaluated?

It's your "fault" in that that's how Or is defined, so it's the behaviour you should expect:

In a Boolean comparison, the Or operator always evaluates both expressions, which could include making procedure calls. The OrElse Operator (Visual Basic) performs short-circuiting, which means that if expression1 is True, then expression2 is not evaluated.

But you don't have to endure it. You can use OrElse to get short-circuiting behaviour.

So you probably want:

If (example Is Nothing OrElse Not example.Item = compare.Item) Then
    'Proceed
End If

I can't say it reads terribly nicely, but it should work...

Vue.js get selected option on @change

You can save your @change="onChange()" an use watchers. Vue computes and watches, it´s designed for that. In case you only need the value and not other complex Event atributes.

Something like:

  ...
  watch: {
    leaveType () {
      this.whateverMethod(this.leaveType)
    }
  },
  methods: {
     onChange() {
         console.log('The new value is: ', this.leaveType)
     }
  }

How to append data to div using JavaScript?

java script

document.getElementById("divID").html("this text will be added to div");

jquery

$("#divID").html("this text will be added to div");

Use .html() without any arguments to see that you have entered. You can use the browser console to quickly test these functions before using them in your code.

Missing Microsoft RDLC Report Designer in Visual Studio

To solve this problem open nutget package manager console and select your project and type install-package microsoft.report.viewer and wait to install

Angular 2.0 router not working on reloading the browser

This is a common situation in all router versions if you are using the default HTML location strategy.

What happens is that the URL on the browser bar is a normal full HTML url, like for example: http://localhost/route.

So when we hit Enter in the browser bar, there is an actual HTTP request sent to the server to get a file named route.

The server does not have such file, and neither something like express is configured on the server to handle the request and provide a response, so the server return 404 Not Found, because it could not find the route file.

What we would like is for the server to return the index.html file containing the single page application. Then the router should kick in and process the /route url and display the component mapped to it.

So to fix the issue we need to configure the server to return index.html (assuming that is the name of your single page application file) in case the request could not be handled, as opposed to a 404 Not Found.

The way to do this will depend on the server side technology being used. If its Java for example you might have to write a servlet, in Rails it will be different, etc.

To give a concrete example, if for example you are using NodeJs, you would have to write a middleware like this:

function sendSpaFileIfUnmatched(req,res) {
    res.sendFile("index.html", { root: '.' });
}

And then register it at the very end of the middleware chain:

app.use(sendSpaFileIfUnmatched);

This will serve index.html instead of returning a 404, the router will kick in and everything will work as expected.

Open youtube video in Fancybox jquery

THIS IS BROKEN, SEE EDIT

<script type="text/javascript">
$("a.more").fancybox({
                    'titleShow'     : false,
                    'transitionIn'  : 'elastic',
                    'transitionOut' : 'elastic',
            'href' : this.href.replace(new RegExp("watch\\?v=", "i"), 'v/'),
            'type'      : 'swf',
            'swf'       : {'wmode':'transparent','allowfullscreen':'true'}
        });
</script>

This way if the user javascript is enabled it opens a fancybox with the youtube embed video, if javascript is disabled it opens the video's youtube page. If you want you can add

target="_blank"

to each of your links, it won't validate on most doctypes, but it will open the link in a new window if fancybox doesn't pick it up.

EDIT

this, above, isn't referenced correctly, so the code won't find href under this. You have to call it like this:

$("a.more").click(function() {
    $.fancybox({
            'padding'       : 0,
            'autoScale'     : false,
            'transitionIn'  : 'none',
            'transitionOut' : 'none',
            'title'         : this.title,
            'width'     : 680,
            'height'        : 495,
            'href'          : this.href.replace(new RegExp("watch\\?v=", "i"), 'v/'),
            'type'          : 'swf',
            'swf'           : {
                 'wmode'        : 'transparent',
                'allowfullscreen'   : 'true'
            }
        });

    return false;
});

as covered at http://fancybox.net/blog #4, replicated above

how to get 2 digits after decimal point in tsql?

Your format syntax is wrong actual syntax is

 FORMAT ( value, format [, culture ] )

Please follow this link it helps you

Click here for more details

How do I name the "row names" column in r

The tibble package now has a dedicated function that converts row names to an explicit variable.

library(tibble)
rownames_to_column(mtcars, var="das_Auto") %>% head

Gives:

           das_Auto  mpg cyl disp  hp drat    wt  qsec vs am gear carb
1         Mazda RX4 21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
2     Mazda RX4 Wag 21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
3        Datsun 710 22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
4    Hornet 4 Drive 21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
5 Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
6           Valiant 18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

Programmatically stop execution of python script?

sys.exit() will do exactly what you want.

import sys
sys.exit("Error message")

How can I get the executing assembly version?

Two options... regardless of application type you can always invoke:

Assembly.GetExecutingAssembly().GetName().Version

If a Windows Forms application, you can always access via application if looking specifically for product version.

Application.ProductVersion

Using GetExecutingAssembly for an assembly reference is not always an option. As such, I personally find it useful to create a static helper class in projects where I may need to reference the underlying assembly or assembly version:

// A sample assembly reference class that would exist in the `Core` project.
public static class CoreAssembly
{
    public static readonly Assembly Reference = typeof(CoreAssembly).Assembly;
    public static readonly Version Version = Reference.GetName().Version;
}

Then I can cleanly reference CoreAssembly.Version in my code as required.

Java - Convert image to Base64

Late GraveDig ... Just constrain your byte array to the file size.

FileInputStream fis = new FileInputStream( file );
byte[] byteArray= new byte[(int) file.length()];

What is the use of ByteBuffer in Java?

This is a good description of its uses and shortcomings. You essentially use it whenever you need to do fast low-level I/O. If you were going to implement a TCP/IP protocol or if you were writing a database (DBMS) this class would come in handy.

Determining the current foreground application from a background task or service

Do something like this:

int showLimit = 20;

/* Get all Tasks available (with limit set). */
ActivityManager mgr = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> allTasks = mgr.getRunningTasks(showLimit);
/* Loop through all tasks returned. */
for (ActivityManager.RunningTaskInfo aTask : allTasks) 
{                  
    Log.i("MyApp", "Task: " + aTask.baseActivity.getClassName()); 
    if (aTask.baseActivity.getClassName().equals("com.android.email.activity.MessageList")) 
        running=true;
}

How to show current time in JavaScript in the format HH:MM:SS?

_x000D_
_x000D_
function realtime() {
  
  let time = moment().format('hh:mm:ss.SS a').replace("m", "");
  document.getElementById('time').innerHTML = time;
  
  setInterval(() => {
    time = moment().format('hh:mm:ss.SS A');
    document.getElementById('time').innerHTML = time;
  }, 0)
}

realtime();
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.1/moment.min.js"></script>

<div id="time"></div>
_x000D_
_x000D_
_x000D_

HTTPS connection Python

Python 2.x: docs.python.org/2/library/httplib.html:

Note: HTTPS support is only available if the socket module was compiled with SSL support.

Python 3.x: docs.python.org/3/library/http.client.html:

Note HTTPS support is only available if Python was compiled with SSL support (through the ssl module).

#!/usr/bin/env python

import httplib
c = httplib.HTTPSConnection("ccc.de")
c.request("GET", "/")
response = c.getresponse()
print response.status, response.reason
data = response.read()
print data
# => 
# 200 OK
# <!DOCTYPE html ....

To verify if SSL is enabled, try:

>>> import socket
>>> socket.ssl
<function ssl at 0x4038b0>

Expand and collapse with angular js

See http://angular-ui.github.io/bootstrap/#/collapse

function CollapseDemoCtrl($scope) {
  $scope.isCollapsed = false;
}



<div ng-controller="CollapseDemoCtrl">
    <button class="btn" ng-click="isCollapsed = !isCollapsed">Toggle collapse</button>
    <hr>
    <div collapse="isCollapsed">
        <div class="well well-large">Some content</div> 
    </div>
</div>

Visual Studio loading symbols

Unchecking "Enable JavaScript debugging for ASP.NET (Chrome and IE)" in Tools->Options->Debugging->General resolved my case with unavailability to launch VS2017 debugger with pre-set breakpoints.

AlertDialog.Builder with custom layout and EditText; cannot access view

You can write:

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

 // ...Irrelevant code for customizing the buttons and title

LayoutInflater inflater = this.getLayoutInflater(); 

View dialogView= inflater.inflate(R.layout.alert_label_editor, null);                    
dialogBuilder.setView(dialogView);

Button button = (Button)dialogView.findViewById(R.id.btnName);

   button.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View view) {

         //Commond here......

       }
   });

EditText editText = (EditText)
dialogView.findViewById(R.id.label_field); 

editText.setText("test label"); 

dialogBuilder.create().show();

Where to put Gradle configuration (i.e. credentials) that should not be committed?

You could put the credentials in a properties file and read it using something like this:

Properties props = new Properties() 
props.load(new FileInputStream("yourPath/credentials.properties")) 
project.setProperty('props', props)

Another approach is to define environment variables at the OS level and read them using:

System.getenv()['YOUR_ENV_VARIABLE']

Java - Change int to ascii

There are many ways to convert an int to ASCII (depending on your needs) but here is a way to convert each integer byte to an ASCII character:

private static String toASCII(int value) {
    int length = 4;
    StringBuilder builder = new StringBuilder(length);
    for (int i = length - 1; i >= 0; i--) {
        builder.append((char) ((value >> (8 * i)) & 0xFF));
    }
    return builder.toString();
}

For example, the ASCII text for "TEST" can be represented as the byte array:

byte[] test = new byte[] { (byte) 0x54, (byte) 0x45, (byte) 0x53, (byte) 0x54 };

Then you could do the following:

int value = ByteBuffer.wrap(test).getInt(); // 1413829460
System.out.println(toASCII(value)); // outputs "TEST"

...so this essentially converts the 4 bytes in a 32-bit integer to 4 separate ASCII characters (one character per byte).

Is it better to use C void arguments "void foo(void)" or not "void foo()"?

Besides syntactical differences, many people also prefer using void function(void) for pracitical reasons:

If you're using the search function and want to find the implementation of the function, you can search for function(void), and it will return the prototype as well as the implementation.

If you omit the void, you have to search for function() and will therefore also find all function calls, making it more difficult to find the actual implementation.

How do I install chkconfig on Ubuntu?

But how do I run this? I tried typing: sudo chkconfig.install which doesn't work.

I'm not sure where you got this package or what it contains; A url of download would be helpful. Without being able to look at the contents of chkconfig.install; I'm surprised to find a unix tool like chkconfig to be bundled in a zip archive, maybe it is still yet to be uncompressed, a tar.gz? but maybe it is a shell script?

I should suggest editing it and seeing what you are executing.

sh chkconfig.install or ./chkconfig.install ; which might work....but my suggestion would be to learn to use update-rc.d as the other answers have suggested but do not speak directly to the question...which is pretty hard to answer without being able to look at the data yourself.

Can the Unix list command 'ls' output numerical chmod permissions?

You don't use ls to get a file's permission information. You use the stat command. It will give you the numerical values you want. The "Unix Way" says that you should invent your own script using ls (or 'echo *') and stat and whatever else you like to give the information in the format you desire.

How to find if a file contains a given string using Windows command line

From other post:

    find /c "string" file >NUL
    if %errorlevel% equ 1 goto notfound
        echo found
    goto done
    :notfound
        echo notfound
    goto done
    :done

Use the /i switch when you want case insensitive checking:

    find /i /c "string" file >NUL

Or something like: if not found write to file.

    find /c "%%P" file.txt  || ( echo %%P >> newfile.txt )

Or something like: if found write to file.

    find /c "%%P" file.txt  && ( echo %%P >> newfile.txt )

Or something like:

    find /c "%%P" file.txt  && ( echo found ) || ( echo not found )

How to use glob() to find files recursively?

I needed a solution for python 2.x that works fast on large directories.
I endet up with this:

import subprocess
foundfiles= subprocess.check_output("ls src/*.c src/**/*.c", shell=True)
for foundfile in foundfiles.splitlines():
    print foundfile

Note that you might need some exception handling in case ls doesn't find any matching file.

REST response code for invalid data

400 is the best choice in both cases. If you want to further clarify the error you can either change the Reason Phrase or include a body to explain the error.

412 - Precondition failed is used for conditional requests when using last-modified date and ETags.

403 - Forbidden is used when the server wishes to prevent access to a resource.

The only other choice that is possible is 422 - Unprocessable entity.

Mysql Compare two datetime fields

You can use the following SQL to compare both date and time -

Select * From temp where mydate > STR_TO_DATE('2009-06-29 04:00:44', '%Y-%m-%d %H:%i:%s');

Attached mysql output when I used same SQL on same kind of table and field that you mentioned in the problem-

enter image description here

It should work perfect.

How to provide password to a command that prompts for one in bash?

Simply use :

echo "password" | sudo -S mount -t vfat /dev/sda1 /media/usb/;
if [ $? -eq 0 ]; then
    echo -e '[ ok ] Usb key mounted'
else
    echo -e '[warn] The USB key is not mounted'
fi

This code is working for me, and its in /etc/init.d/myscriptbash.sh

Failed to open/create the internal network Vagrant on Windows10

I just ran into this problem with VirtualBox 5.1 on Windows 8. It turns out the problem was with the Kaspersky virus protection I have installed. It added the "Kaspersky Anti-Virus NDIS 6 Filter" on the host-only adapter on the windows side. When I disabled that filter the VM started properly:

host-only network adapter properties

Create patch or diff file from git repository and apply it to another different git repository

As a complementary, to produce patch for only one specific commit, use:

git format-patch -1 <sha>

When the patch file is generated, make sure your other repo knows where it is when you use git am ${patch-name}

Before adding the patch, use git apply --check ${patch-name} to make sure that there is no confict.

Could not load dynamic library 'cudart64_101.dll' on tensorflow CPU-only installation

To install the prerequisites for GPU support in TensorFlow 2.1:

  1. Install your latest GPU drivers.
  2. Install CUDA 10.1.
    • If the CUDA installer reports "you are installing an older driver version", you may wish to choose a custom installation and deselect some components. Indeed, note that software bundled with CUDA including GeForce Experience, PhysX, a Display Driver, and Visual Studio integration are not required by TensorFlow.
    • Also note that TensorFlow requires a specific version of the CUDA Toolkit unless you build from source; for TensorFlow 2.1 and 2.2, this is currently version 10.1.
  3. Install cuDNN.
    1. Download cuDNN v7.6.4 for CUDA 10.1. This will require you to sign up to the NVIDIA Developer Program.
    2. Unzip to a suitable location and add the bin directory to your PATH.
  4. Install tensorflow by pip install tensorflow.
  5. You may need to restart your PC.

How to resolve ORA 00936 Missing Expression Error?

Remove the coma at the end of your SELECT statement (VALUE,), and also remove the one at the end of your FROM statement (rrf b,)

How can I display a tooltip message on hover using jQuery?

You can use bootstrap tooltip. Do not forget to initialize it.

<span class="tooltip-r" data-toggle="tooltip" data-placement="left" title="Explanation">
inside span
</span>

Will be shown text Explanation on the left side.

and run it with js:

$('.tooltip-r').tooltip();

Shell Script: How to write a string to file and to stdout on console?

You can use >> to print in another file.

echo "hello" >> logfile.txt

Error resolving template "index", template might not exist or might not be accessible by any of the configured Template Resolvers

this can be resolved by copying the below code in application.properties

spring.thymeleaf.enabled=false

Convert Java Object to JsonNode in Jackson

As of Jackson 1.6, you can use:

JsonNode node = mapper.valueToTree(map);

or

JsonNode node = mapper.convertValue(object, JsonNode.class);

Source: is there a way to serialize pojo's directly to treemodel?

Single Page Application: advantages and disadvantages

Let's look at one of the most popular SPA sites, GMail.

1. SPA is extremely good for very responsive sites:

Server-side rendering is not as hard as it used to be with simple techniques like keeping a #hash in the URL, or more recently HTML5 pushState. With this approach the exact state of the web app is embedded in the page URL. As in GMail every time you open a mail a special hash tag is added to the URL. If copied and pasted to other browser window can open the exact same mail (provided they can authenticate). This approach maps directly to a more traditional query string, the difference is merely in the execution. With HTML5 pushState() you can eliminate the #hash and use completely classic URLs which can resolve on the server on the first request and then load via ajax on subsequent requests.

2. With SPA we don't need to use extra queries to the server to download pages.

The number of pages user downloads during visit to my web site?? really how many mails some reads when he/she opens his/her mail account. I read >50 at one go. now the structure of the mails is almost the same. if you will use a server side rendering scheme the server would then render it on every request(typical case). - security concern - you should/ should not keep separate pages for the admins/login that entirely depends upon the structure of you site take paytm.com for example also making a web site SPA does not mean that you open all the endpoints for all the users I mean I use forms auth with my spa web site. - in the probably most used SPA framework Angular JS the dev can load the entire html temple from the web site so that can be done depending on the users authentication level. pre loading html for all the auth types isn't SPA.

3. May be any other advantages? Don't hear about any else..

  • these days you can safely assume the client will have javascript enabled browsers.
  • only one entry point of the site. As I mentioned earlier maintenance of state is possible you can have any number of entry points as you want but you should have one for sure.
  • even in an SPA user only see to what he has proper rights. you don't have to inject every thing at once. loading diff html templates and javascript async is also a valid part of SPA.

Advantages that I can think of are:

  1. rendering html obviously takes some resources now every user visiting you site is doing this. also not only rendering major logics are now done client side instead of server side.
  2. date time issues - I just give the client UTC time is a pre set format and don't even care about the time zones I let javascript handle it. this is great advantage to where I had to guess time zones based on location derived from users IP.
  3. to me state is more nicely maintained in an SPA because once you have set a variable you know it will be there. this gives a feel of developing an app rather than a web page. this helps a lot typically in making sites like foodpanda, flipkart, amazon. because if you are not using client side state you are using expensive sessions.
  4. websites surely are extremely responsive - I'll take an extreme example for this try making a calculator in a non SPA website(I know its weird).

Updates from Comments

It doesn't seem like anyone mentioned about sockets and long-polling. If you log out from another client say mobile app, then your browser should also log out. If you don't use SPA, you have to re-create the socket connection every time there is a redirect. This should also work with any updates in data like notifications, profile update etc

An alternate perspective: Aside from your website, will your project involve a native mobile app? If yes, you are most likely going to be feeding raw data to that native app from a server (ie JSON) and doing client-side processing to render it, correct? So with this assertion, you're ALREADY doing a client-side rendering model. Now the question becomes, why shouldn't you use the same model for the website-version of your project? Kind of a no-brainer. Then the question becomes whether you want to render server-side pages only for SEO benefits and convenience of shareable/bookmarkable URLs

How to get the class of the clicked element?

I saw this question so I thought I might expand on it a little more. This is an expansion of the idea that @SteveFenton had. Instead of binding a click event to each li element, it would be more efficient to delegate the events from the ul down.

For jQuery 1.7 and higher

$("ul.tabs").on('click', 'li', function(e) {
   alert($(this).attr("class"));
});

Documentation: .on()

For jQuery 1.4.2 - 1.7

$("ul.tabs").delegate('li', 'click', function(e) {
   alert($(this).attr("class"));
});

Documentation: .delegate()

As a last resort for jQuery 1.3 - 1.4

$("ul.tabs").children('li').live('click', function(e) {
   alert($(this).attr("class"));
});

or

$("ul.tabs > li").live('click', function(e) {
   alert($(this).attr("class"));
});

Documentation: .live()

CSS to keep element at "fixed" position on screen

The easiest way is to use position: fixed:

.element {
  position: fixed;
  bottom: 0;
  right: 0;
}

http://www.w3.org/TR/CSS21/visuren.html#choose-position

(note that position fixed is buggy / doesn't work on ios and android browsers)

Add a space (" ") after an element using :after

element::after { 
    display: block;
    content: " ";
}

This worked for me.

Remove Server Response Header IIS7

The solution proposed above in combination worked for me with following changes. Here I am posting my scenario and solution.

For me I wanted to remove the following headers:

  • Server
  • X-Powered-By
  • X-AspNet-Version
  • X-AspNetMvc-Version

I added these to my global.asax:

<%@ Application Language="C#" %>
<script runat="server">
    protected void Application_PreSendRequestHeaders()
    {
        Response.Headers.Remove("Server");
        Response.Headers.Remove("X-Powered-By");
        Response.Headers.Remove("X-AspNet-Version");
        Response.Headers.Remove("X-AspNetMvc-Version");
    }
</script>

The above event was not getting triggered, so for that I added following to web.config then it worked.

<modules runAllManagedModulesForAllRequests="true" />

and for removing version header I also added following to web.config:

<httpRuntime enableVersionHeader="false" />

Changes in web.config:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true" />
    </system.webServer>
    <system.web>
        <httpRuntime enableVersionHeader="false" />
    </system.web>
</configuration>

Hope it helps!

FontAwesome icons not showing. Why?

Notes

This answer is created when the latest version of fontawesome is v5.* but yarn and npm version points to v4.* (21.06.2019). In other words, versions installed via package managers is behind latest release !

If you installed font-awesome via package manager (yarn or npm) then, please be aware which version was installed. Alternatively, if you've already installed font-awesome long time ago then, check what version was installed.

Installing font-awesome as new dependency:

$ yarn add font-awesome
success Saved lockfile.
success Saved 1 new dependency.
info Direct dependencies
+- [email protected]
info All dependencies
+- [email protected]
Done in 3.32s.

Checking what version of font-awesome is already installed:

$ yarn list font-awesome
yarn list v1.16.0
warning Filtering by arguments is deprecated. Please use the pattern option instead.
+- [email protected]
Done in 0.79s.

Problem

After you installed font-awesome dependency, you incorporate one of these two source files font-awesome.css or font-awesome.min.css (founded in node_modules/font-awesome/css/) into header of your webpage e.g.

<head>
  <link type="text/css" rel="stylesheet" href="css/font-awesome.css">
</head>

Next, you visit https://fontawesome.com/. You select free icons and you search for sign-in icon (as an example). You copy the icon e.g. <i class="fas fa-sign-in-alt"></i>, you paste it into your html and, icon is not shown, or is display as square or rectangle !

Solution

In essence, versions installed via package managers is behind version that is shown on https://fontawesome.com/ website. As you can see we installed font-awesome v4.7.0 but, website shows documentation for font-awesome v5.*. Solution, visit the website that documents icons for v4.7.0 https://fontawesome.com/v4.7.0, copy appropriate icon e.g. <i class="fa fa-sign-in" aria-hidden="true"></i> and incorporate it into your html.

How can I auto increment the C# assembly version via our CI platform (Hudson)?

As a continuation of MikeS's answer I wanted to add that VS + Visual Studio Visualization and Modeling SDK needs to be installed for this to work, and you need to modify the project file as well. Should also be mentioned I use Jenkins as build server running on a windows 2008 R2 server box with version module, where I get the BUILD_NUMBER.

My Text Template file version.tt looks like this

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ output extension=".cs" #>
<#
var build = Environment.GetEnvironmentVariable("BUILD_NUMBER");
build = build == null ? "0" : int.Parse(build).ToString();
var revision = Environment.GetEnvironmentVariable("_BuildVersion");
revision = revision == null ? "5.0.0.0" : revision;    
#>
using System.Reflection;
[assembly: AssemblyVersion("<#=revision#>")]
[assembly: AssemblyFileVersion("<#=revision#>")]

I have the following in the Property Groups

<PropertyGroup>
    <TransformOnBuild>true</TransformOnBuild>
    <OverwriteReadOnlyOutputFiles>true</OverwriteReadOnlyOutputFiles>
    <TransformOutOfDateOnly>false</TransformOutOfDateOnly>
</PropertyGroup>

after import of Microsoft.CSharp.targets, I have this (dependant of where you install VS

<Import Project="C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\TextTemplating\v10.0\Microsoft.TextTemplating.targets" />

On my build server I then have the following script to run the text transformation before the actual build, to get the last changeset number on TFS

set _Path="C:\Build_Source\foo"

pushd %_Path% 
"%ProgramFiles(x86)%\Microsoft Visual Studio 10.0\Common7\IDE\tf.exe" history . /r /noprompt /stopafter:1 /Version:W > bar
FOR /f "tokens=1" %%foo in ('findstr /R "^[0-9][0-9]*" bar') do set _BuildVersion=5.0.%BUILD_NUMBER%.%%foo
del bar
popd

echo %BUILD_NUMBER%
echo %_BuildVersion%
cd C:\Program Files (x86)\Jenkins\jobs\MyJob\workspace\MyProject
MSBuild MyProject.csproj /t:TransformAll 
...
<rest of bld script>

This way I can keep track of builds AND changesets, so if I haven't checked anything in since last build, the last digit should not change, however I might have made changes to the build process, hence the need for the second last number. Of course if you make multiple check-ins before a build you only get the last change reflected in the version. I guess you could concatenate of that is required.

I'm sure you can do something fancier and call TFS directly from within the tt Template, however this works for me.

I can then get my version at runtime like this

Assembly assembly = Assembly.GetExecutingAssembly();
FileVersionInfo fvi = FileVersionInfo.GetVersionInfo(assembly.Location);
return fvi.FileVersion;

What is the difference between static func and class func in Swift?

To declare a type variable property, mark the declaration with the static declaration modifier. Classes may mark type computed properties with the class declaration modifier instead to allow subclasses to override the superclass’s implementation. Type properties are discussed in Type Properties.

NOTE
In a class declaration, the keyword static has the same effect as marking the declaration with both the class and final declaration modifiers.

Source: The Swift Programming Language - Type Variable Properties

How does Django's Meta class work?

You are asking a question about two different things:

  1. Meta inner class in Django models:

    This is just a class container with some options (metadata) attached to the model. It defines such things as available permissions, associated database table name, whether the model is abstract or not, singular and plural versions of the name etc.

    Short explanation is here: Django docs: Models: Meta options

    List of available meta options is here: Django docs: Model Meta options

    For latest version of Django: Django docs: Model Meta options

  2. Metaclass in Python:

    The best description is here: What are metaclasses in Python?

Sorting a List<int>

Sort a list of integers descending

class Program
    {       
        private class SortIntDescending : IComparer<int>
        {
            int IComparer<int>.Compare(int a, int b) //implement Compare
            {              
                if (a > b)
                    return -1; //normally greater than = 1
                if (a < b)
                    return 1; // normally smaller than = -1
                else
                    return 0; // equal
            }
        }

        static List<int> intlist = new List<int>(); // make a list

        static void Main(string[] args)
        {
            intlist.Add(5); //fill the list with 5 ints
            intlist.Add(3);
            intlist.Add(5);
            intlist.Add(15);
            intlist.Add(7);

            Console.WriteLine("Unsorted list :");
            Printlist(intlist);

            Console.WriteLine();
            // intlist.Sort(); uses the default Comparer, which is ascending
            intlist.Sort(new SortIntDescending()); //sort descending

            Console.WriteLine("Sorted descending list :");
            Printlist(intlist);

            Console.ReadKey(); //wait for keydown
        }

        static void Printlist(List<int> L)
        {
            foreach (int i in L) //print on the console
            {
                Console.WriteLine(i);
            }
        }
    }

css rotate a pseudo :after or :before content:""

.process-list:after{
    content: "\2191";
    position: absolute;
    top:50%;
    right:-8px;
    background-color: #ea1f41;
    width:35px;
    height: 35px;
    border:2px solid #ffffff;
    border-radius: 5px;
    color: #ffffff;
    z-index: 10000;
    -webkit-transform: rotate(50deg) translateY(-50%);
    -moz-transform: rotate(50deg) translateY(-50%);
    -ms-transform: rotate(50deg) translateY(-50%);
    -o-transform: rotate(50deg) translateY(-50%);
    transform: rotate(50deg) translateY(-50%);
}

you can check this code . i hope you will easily understand.

Django MEDIA_URL and MEDIA_ROOT

Please read the official Django DOC carefully and you will find the most fit answer.

The best and easist way to solve this is like below.

from django.conf import settings
from django.conf.urls.static import static

urlpatterns = patterns('',
    # ... the rest of your URLconf goes here ...
) + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

Run a single migration file

If you've implemented a change method like this:

class AddPartNumberToProducts < ActiveRecord::Migration
  def change
    add_column :products, :part_number, :string
  end
end

You can create an instance of the migration and run migrate(:up) or migrate(:down) on an instance, like this:

$ rails console
>> require "db/migrate/20090408054532_add_part_number_to_products.rb"
>> AddPartNumberToProducts.new.migrate(:down)

Importing images from a directory (Python) to list or dictionary

I'd start by using glob:

from PIL import Image
import glob
image_list = []
for filename in glob.glob('yourpath/*.gif'): #assuming gif
    im=Image.open(filename)
    image_list.append(im)

then do what you need to do with your list of images (image_list).

jQuery ajax success callback function definition

Try rewriting your success handler to:

success : handleData

The success property of the ajax method only requires a reference to a function.

In your handleData function you can take up to 3 parameters:

object data
string textStatus
jqXHR jqXHR

adding child nodes in treeview

You may do as follows to Populate treeView with parent and child node. And also with display and value member of parent and child nodes:

   arrayRoot = taskData.GetRocordForRoot();  // iterate through database table
    for (int j = 0; j <arrayRoot.length; j++) { 
                TreeNode root = new TreeNode();  // Creating new root node
                root.Text = "displayString";
                root.Tag = "valueString";
                treeView1.Nodes.Add(root); //Adding the root node

             arrayChild = taskData.GetRocordForChild();// iterate through database table
                for (int i = 0; i < arrayChild.length; i++) {
                    TreeNode child = new TreeNode(); // creating child node
                    child.Text = "displayString"
                    child.Tag = "valueString";
                    root.Nodes.Add(child); // adding child node
                }

            }

How to Delete node_modules - Deep Nested Folder in Windows

I made a Windows context item to fast delete node_modules or other folders. I use it when Windows doesn't delete a folder because of some invalid chars in the directory path.

HOW TO INSTALL?

  1. Install rimraf => npm install rimraf -g

  2. Create a new file named delete.bat, set the content as below and copy it into c:\windows\system32\

    delete.bat:

 @ECHO OFF
 ECHO.
 ECHO %CD% 
 ECHO.
 ECHO Are you sure to delete the folder with Rimraf?
 PAUSE
 SET FOLDER=%CD%
 CD /

 rimraf "%FOLDER%"

 rem DEL /F/Q/S "%FOLDER%" > NUL
 rem RMDIR /Q/S "%FOLDER%"

 EXIT
  1. Run fast-delete.reg file to import into registry.

    Done!

final result

How to skip the OPTIONS preflight request?

The preflight is being triggered by your Content-Type of application/json. The simplest way to prevent this is to set the Content-Type to be text/plain in your case. application/x-www-form-urlencoded & multipart/form-data Content-Types are also acceptable, but you'll of course need to format your request payload appropriately.

If you are still seeing a preflight after making this change, then Angular may be adding an X-header to the request as well.

Or you might have headers (Authorization, Cache-Control...) that will trigger it, see:

When to use window.opener / window.parent / window.top

when you are dealing with popups window.opener plays an important role, because we have to deal with fields of parent page as well as child page, when we have to use values on parent page we can use window.opener or we want some data on the child window or popup window at the time of loading then again we can set the values using window.opener

How to change text color and console color in code::blocks?

You can also use rlutil:

  • cross platform,
  • header only (rlutil.h),
  • works for C and C++,
  • implements setColor(), cls(), getch(), gotoxy(), etc.
  • License: WTFPL

Your code would become something like this:

#include <stdio.h>

#include "rlutil.h"

int main(int argc, char* argv[])
{
    setColor(BLUE);
    printf("\n \n \t This is dummy program for text color ");
    getch();

    return 0;
}

Have a look at example.c and test.cpp for C and C++ examples.

What is the difference between ng-if and ng-show/ng-hide

The ng-if directive removes the content from the page and ng-show/ng-hide uses the CSS display property to hide content.

This is useful in case you want to use :first-child and :last-child pseudo selectors to style.

Is there a reason for C#'s reuse of the variable in a foreach?

In C# 5.0, this problem is fixed and you can close over loop variables and get the results you expect.

The language specification says:

8.8.4 The foreach statement

(...)

A foreach statement of the form

foreach (V v in x) embedded-statement

is then expanded to:

{
  E e = ((C)(x)).GetEnumerator();
  try {
      while (e.MoveNext()) {
          V v = (V)(T)e.Current;
          embedded-statement
      }
  }
  finally {
      … // Dispose e
  }
}

(...)

The placement of v inside the while loop is important for how it is captured by any anonymous function occurring in the embedded-statement. For example:

int[] values = { 7, 9, 13 };
Action f = null;
foreach (var value in values)
{
    if (f == null) f = () => Console.WriteLine("First value: " + value);
}
f();

If v was declared outside of the while loop, it would be shared among all iterations, and its value after the for loop would be the final value, 13, which is what the invocation of f would print. Instead, because each iteration has its own variable v, the one captured by f in the first iteration will continue to hold the value 7, which is what will be printed. (Note: earlier versions of C# declared v outside of the while loop.)

How to work with complex numbers in C?

This code will help you, and it's fairly self-explanatory:

#include <stdio.h>      /* Standard Library of Input and Output */
#include <complex.h>    /* Standard Library of Complex Numbers */

int main() {

    double complex z1 = 1.0 + 3.0 * I;
    double complex z2 = 1.0 - 4.0 * I;

    printf("Working with complex numbers:\n\v");

    printf("Starting values: Z1 = %.2f + %.2fi\tZ2 = %.2f %+.2fi\n", creal(z1), cimag(z1), creal(z2), cimag(z2));

    double complex sum = z1 + z2;
    printf("The sum: Z1 + Z2 = %.2f %+.2fi\n", creal(sum), cimag(sum));

    double complex difference = z1 - z2;
    printf("The difference: Z1 - Z2 = %.2f %+.2fi\n", creal(difference), cimag(difference));

    double complex product = z1 * z2;
    printf("The product: Z1 x Z2 = %.2f %+.2fi\n", creal(product), cimag(product));

    double complex quotient = z1 / z2;
    printf("The quotient: Z1 / Z2 = %.2f %+.2fi\n", creal(quotient), cimag(quotient));

    double complex conjugate = conj(z1);
    printf("The conjugate of Z1 = %.2f %+.2fi\n", creal(conjugate), cimag(conjugate));

    return 0;
}

  with:

creal(z1): get the real part (for float crealf(z1), for long double creall(z1))

cimag(z1): get the imaginary part (for float cimagf(z1), for long double cimagl(z1))

Another important point to remember when working with complex numbers is that functions like cos(), exp() and sqrt() must be replaced with their complex forms, e.g. ccos(), cexp(), csqrt().

Action bar navigation modes are deprecated in Android L

Well for me to handle the deprecated navigation toolbar by using toolbar v7 widget appcompat.

    setSupportActionBar(toolbar);
    getSupportActionBar().setSubtitle("Feed Detail");
    toolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //goToWhere
        }
    });

Calling method using JavaScript prototype

In addition, if you want to override all instances and not just that one special instance, this one might help.

function MyClass() {}

MyClass.prototype.myMethod = function() {
  alert( "doing original");
};
MyClass.prototype.myMethod_original = MyClass.prototype.myMethod;
MyClass.prototype.myMethod = function() {
  MyClass.prototype.myMethod_original.call( this );
  alert( "doing override");
};

myObj = new MyClass();
myObj.myMethod();

result:

doing original
doing override

Undefined index error PHP

this error occurred sometime method attribute ( valid passing method ) Error option : method="get" but called by $Fname = $_POST["name"]; or

       method="post" but  called by  $Fname = $_GET["name"];

More info visit http://www.doordie.co.in/index.php

How to use random in BATCH script?

And just to be completely random for those who don't always want a black screen.

@(IF not "%1" == "max" (start /MAX cmd /Q /C %0 max&X)ELSE set A=0&set C=1&set V=A&wmic process where name="cmd.exe" CALL setpriority "REALTIME">NUL)&CLS
:Y
(IF %A% EQU 10 set A=A)&(IF %A% EQU 11 set A=B)&(IF %A% EQU 12 set A=C)&(IF %A% EQU 13 set A=D)&(IF %A% EQU 14 set A=E)&(IF %A% EQU 15 set A=F)
(IF %V% EQU 10 set V=A)&(IF %V% EQU 11 set V=B)&(IF %V% EQU 12 set V=C)&(IF %V% EQU 13 set V=D)&(IF %V% EQU 14 set V=E)&(IF %V% EQU 15 set V=F)
(IF %A% EQU %V% set A=0)
title %A%%V%%random%6%random%%random%%random%%random%9%random%%random%%random%%random%%random%%random%%random%%random%%random%%random%%random%%random%&color %A%%V%&ECHO %random%%C%%random%%random%%random%%random%6%random%9%random%%random%%random%%random%%random%%random%%random%%random%%random%&(IF %C% EQU 46 (TIMEOUT /T 1 /NOBREAK>nul&set C=1&CLS&SET /A A=%random% %%15 +1&SET /A V=%random% %%15 +1)ELSE set /A C=%C%+1)&goto Y

This will change screen color also both are random.

Multiple Cursors in Sublime Text 2 Windows

Try using Ctrl-click on the multiple places you want the cursors. Ctrl-D is for multiple incremental finds.

How to do this in Laravel, subquery where in

Consider this code:

Products::whereIn('id', function($query){
    $query->select('paper_type_id')
    ->from(with(new ProductCategory)->getTable())
    ->whereIn('category_id', ['223', '15'])
    ->where('active', 1);
})->get();

Connect to network drive with user name and password

You can use WebClient class to connect to the network driver using credentials. Include the below namespace:

using System.Net;

WebClient request = new WebClient();
request.Credentials = new NetworkCredential("domain\username", "password");
string[] theFolders = Directory.GetDirectories(@"\\computer\share");

Structs in Javascript

I use objects JSON style for dumb structs (no member functions).

Downloading all maven dependencies to a directory NOT in repository?

Based on @Raghuram answer, I find a tutorial on Copying project dependencies, Just:

  1. Open your project pom.xml file and find this:

    <project>
      [...]
      <build>
        <plugins>
          ...
        </plugins>
      </build>
      [...]
    </project>
    
  2. Than replace the <plugins> ... </plugins> with:

    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>3.0.0</version>
        <executions>
          <execution>
            <id>copy-dependencies</id>
            <phase>package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <outputDirectory>${project.build.directory}/alternateLocation</outputDirectory>
              <overWriteReleases>false</overWriteReleases>
              <overWriteSnapshots>false</overWriteSnapshots>
              <overWriteIfNewer>true</overWriteIfNewer>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
    
  3. And call maven within the command line mvn dependency:copy-dependencies

After it finishes, it will create the folder target/dependency within all the jar's dependencies on the current directory where the pom.xml lives.

Laravel 4: Redirect to a given url

You can use different types of redirect method in laravel -

return redirect()->intended('http://heera.it');

OR

return redirect()->to('http://heera.it');

OR

use Illuminate\Support\Facades\Redirect;

return Redirect::to('/')->with(['type' => 'error','message' => 'Your message'])->withInput(Input::except('password'));

OR

return redirect('/')->with(Auth::logout());

OR

return redirect()->route('user.profile', ['step' => $step, 'id' => $id]);

What exactly is the 'react-scripts start' command?

"start" is a name of a script, in npm you run scripts like this npm run scriptName, npm start is also a short for npm run start

As for "react-scripts" this is a script related specifically to create-react-app

How to undo a git pull?

This worked for me.

git reset --hard ORIG_HEAD 

Undo a merge or pull:

$ git pull                         (1)
Auto-merging nitfol
CONFLICT (content): Merge conflict in nitfol
Automatic merge failed; fix conflicts and then commit the result.
$ git reset --hard                 (2)
$ git pull . topic/branch          (3)
Updating from 41223... to 13134...
Fast-forward
$ git reset --hard ORIG_HEAD       (4)

Checkout this: HEAD and ORIG_HEAD in Git for more.

Sorting an Array of int using BubbleSort

Here is an example of bubbleSort, and Time Complexity is O(n).

 int[] bubbleSort(int[] numbers) {
        if(numbers == null || numbers.length == 1) {
            return numbers;
        }

        boolean isSorted = false;

        while(!isSorted) {
            isSorted = true;
            for(int i = 0; i < numbers.length - 1; i++) {
                if(numbers[i] > numbers[i + 1]) {
                    int hold = numbers[i + 1];
                    numbers[i + 1] = numbers[i];
                    numbers[i] = hold;
                    isSorted = false;
                }
            }
        }

        return numbers;
    }

Attach the Java Source Code

Hold ctrl key and then click on class of which you want to see the inner working (for ex: String) then you will find there button "Attach Source". Click on it. Then click on External Folder. Then browse to your jdk location, per instance C:\Program Files\Java\jdk1.6.0. That's it.

enter image description here

Can gcc output C code after preprocessing?

I'm using gcc as a preprocessor (for html files.) It does just what you want. It expands "#--" directives, then outputs a readable file. (NONE of the other C/HTML preprocessors I've tried do this- they concatenate lines, choke on special characters, etc.) Asuming you have gcc installed, the command line is:

gcc -E -x c -P -C -traditional-cpp code_before.cpp > code_after.cpp

(Doesn't have to be 'cpp'.) There's an excellent description of this usage at http://www.cs.tut.fi/~jkorpela/html/cpre.html.

The "-traditional-cpp" preserves whitespace & tabs.

How do I clone a range of array elements to a new array?

In C# 8.0, you can now do many fancier works including reverse indices and ranges like in Python, such as:

int[] list = {1, 2, 3, 4, 5, 6};
var list2 = list[2..5].Clone() as int[]; // 3, 4, 5
var list3 = list[..5].Clone() as int[];  // 1, 2, 3, 4, 5
var list4 = list[^4..^0].Clone() as int[];  // reverse index

How do I make a transparent border with CSS?

Use transparent property

border-color : transparent;

How do I update a GitHub forked repository?

Since November 2013 there has been an unofficial feature request open with GitHub to ask them to add a very simple and intuitive method to keep a local fork in sync with upstream:

https://github.com/isaacs/github/issues/121

Note: Since the feature request is unofficial it is also advisable to contact [email protected] to add your support for a feature like this to be implemented. The unofficial feature request above could be used as evidence of the amount of interest in this being implemented.

how to set default culture info for entire c# application

If you use a Language Resource file to set the labels in your application you need to set the its value:

CultureInfo customCulture = new CultureInfo("en-US");
Languages.Culture = customCulture;

$ is not a function - jQuery error

Use jQuery for $. I tried and work.

Android SQLite: Update Statement

You can try:

db.execSQL("UPDATE DB_TABLE SET YOUR_COLUMN='newValue' WHERE id=6 ");

Or

ContentValues newValues = new ContentValues();
newValues.put("YOUR_COLUMN", "newValue");

db.update("YOUR_TABLE", newValues, "id=6", null);

Or

ContentValues newValues = new ContentValues();
newValues.put("YOUR_COLUMN", "newValue");

String[] args = new String[]{"user1", "user2"};
db.update("YOUR_TABLE", newValues, "name=? OR name=?", args);

SQL Server stored procedure Nullable parameter

It looks like you're passing in Null for every argument except for PropertyValueID and DropDownOptionID, right? I don't think any of your IF statements will fire if only these two values are not-null. In short, I think you have a logic error.

Other than that, I would suggest two things...

First, instead of testing for NULL, use this kind syntax on your if statements (it's safer)...

    ELSE IF ISNULL(@UnitValue, 0) != 0 AND ISNULL(@UnitOfMeasureID, 0) = 0

Second, add a meaningful PRINT statement before each UPDATE. That way, when you run the sproc in MSSQL, you can look at the messages and see how far it's actually getting.

C read file line by line

Use fgets() to read a line from a file handle.

What is the inclusive range of float and double in Java?

From Primitives Data Types:

  • float: The float data type is a single-precision 32-bit IEEE 754 floating point. Its range of values is beyond the scope of this discussion, but is specified in section 4.2.3 of the Java Language Specification. As with the recommendations for byte and short, use a float (instead of double) if you need to save memory in large arrays of floating point numbers. This data type should never be used for precise values, such as currency. For that, you will need to use the java.math.BigDecimal class instead. Numbers and Strings covers BigDecimal and other useful classes provided by the Java platform.

  • double: The double data type is a double-precision 64-bit IEEE 754 floating point. Its range of values is beyond the scope of this discussion, but is specified in section 4.2.3 of the Java Language Specification. For decimal values, this data type is generally the default choice. As mentioned above, this data type should never be used for precise values, such as currency.

For the range of values, see the section 4.2.3 Floating-Point Types, Formats, and Values of the JLS.

IOException: Too many open files

Aside from looking into root cause issues like file leaks, etc. in order to do a legitimate increase the "open files" limit and have that persist across reboots, consider editing

/etc/security/limits.conf

by adding something like this

jetty soft nofile 2048
jetty hard nofile 4096

where "jetty" is the username in this case. For more details on limits.conf, see http://linux.die.net/man/5/limits.conf

log off and then log in again and run

ulimit -n

to verify that the change has taken place. New processes by this user should now comply with this change. This link seems to describe how to apply the limit on already running processes but I have not tried it.

The default limit 1024 can be too low for large Java applications.

How do you find out which version of GTK+ is installed on Ubuntu?

To make the answer more general than Ubuntu (I have Redhat):

gtk is usually installed under /usr, but possibly in other locations. This should be visible in environment variables. Check with

env | grep gtk

Then try to find where your gtk files are stored. For example, use locate and grep.

locate gtk | grep /usr/lib

In this way, I found /usr/lib64/gtk-2.0, which contains the subdirectory 2.10.0, which contains many .so library files. My conclusion is that I have gtk+ version 2.10. This is rather consistent with the rpm command on Redhat: rpm -qa | grep gtk2, so I think my conclusion is right.

What is __declspec and when do I need to use it?

Another example to illustrate the __declspec keyword:

When you are writing a Windows Kernel Driver, sometimes you want to write your own prolog/epilog code sequences using inline assembler code, so you could declare your function with the naked attribute.

__declspec( naked ) int func( formal_parameters ) {}

Or

#define Naked __declspec( naked )
Naked int func( formal_parameters ) {}

Please refer to naked (C++)

how to refresh my datagridview after I add new data

I think the problem is that you're adding a new entry to the database, but not the data structure that the datagrid represents. You're only querying the database for data in the load event, so if the database changes after that you're not going to know about it.

To solve the problem you need to either re-query the database after each insert, or add the item to tables(0) data structure in addition to the Access table after each insert.

Capture key press without placing an input element on the page?

For non-printable keys such as arrow keys and shortcut keys such as Ctrl-z, Ctrl-x, Ctrl-c that may trigger some action in the browser (for instance, inside editable documents or elements), you may not get a keypress event in all browsers. For this reason you have to use keydown instead, if you're interested in suppressing the browser's default action. If not, keyup will do just as well.

Attaching a keydown event to document works in all the major browsers:

document.onkeydown = function(evt) {
    evt = evt || window.event;
    if (evt.ctrlKey && evt.keyCode == 90) {
        alert("Ctrl-Z");
    }
};

For a complete reference, I strongly recommend Jan Wolter's article on JavaScript key handling.

Get today date in google appScript

The Date object is used to work with dates and times.

Date objects are created with new Date()

var now = new Date();

now - Current date and time object.

function changeDate() {
    var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(GA_CONFIG);
    var date = new Date();
    sheet.getRange(5, 2).setValue(date); 
}

Is there a function to round a float in C or do I need to write my own?

Sure, you can use roundf(). If you want to round to one decimal, then you could do something like: roundf(10 * x) / 10

How do I mock a REST template exchange?

If your intention is test the service without care about the rest call, I will suggest to not use any annotation in your unit test to simplify the test.

So, my suggestion is refactor your service to receive the resttemplate using injection constructor. This will facilitate the test. Example:

@Service
class SomeService {
    @AutoWired
    SomeService(TestTemplateObjects restTemplateObjects) {
        this.restTemplateObjects = restTemplateObjects;
    }
}

The RestTemplate as component, to be injected and mocked after:

@Component
public class RestTemplateObjects {

    private final RestTemplate restTemplate;

    public RestTemplateObjects () {
        this.restTemplate = new RestTemplate();
        // you can add extra setup the restTemplate here, like errorHandler or converters
    }

    public RestTemplate getRestTemplate() {
        return restTemplate;
    }
}

And the test:

public void test() {

    when(mockedRestTemplateObject.get).thenReturn(mockRestTemplate);

    //mock restTemplate.exchange
    when(mockRestTemplate.exchange(...)).thenReturn(mockedResponseEntity);

    SomeService someService = new SomeService(mockedRestTemplateObject);
    someService.getListofObjectsA();
}

In this way, you have direct access to mock the rest template by the SomeService constructor.

How to use onResume()?

After an activity started, restarted (onRestart() happens before onStart()), or paused (onPause()), onResume() called. When the activity is in the state of onResume(), the activity is ready to be used by the app user.

I have studied the activity lifecycle a little bit, and here's my understanding of this topic: If you want to restart the activity (A) at the end of the execution of another, there could be a few different cases.

  1. The other activity (B) has been paused and/or stopped or destroyed, and the activity A possibly had been paused (onPause()), in this case, activity A will call onResume()

  2. The activity B has been paused and/or stopped or destroyed, the activity A possibly had been stopped (onStop()) due to memory thing, in this case, activity A will call onRestart() first, onStart() second, then onResume()

  3. The activity B has been paused and/or stopped or destroyed, the activity A has been destroyed, the programmer can call onStart() manually to start the activity first, then onResume() because when an activity is in the destroyed status the activity has not started, and this happens before the activity being completely removed. If the activity is removed, the activity needs to be created again. Manually calling onStart() I think it's because if the activity not started and it is created, onStart() will be called after onCreate().

If you want to update data, make a data update function and put the function inside the onResume(). Or put a loadData function inside onResume()

It's better to understand the lifecycle with the help of the Activity lifecycle diagram.

A url resource that is a dot (%2E)

It's actually not really clearly stated in the standard (RFC 3986) whether a percent-encoded version of . or .. is supposed to have the same this-folder/up-a-folder meaning as the unescaped version. Section 3.3 only talks about “The path segments . and ..”, without clarifying whether they match . and .. before or after pct-encoding.

Personally I find Firefox's interpretation that %2E does not mean . most practical, but unfortunately all the other browsers disagree. This would mean that you can't have a path component containing only . or ...

I think the only possible suggestion is “don't do that”! There are other path components that are troublesome too, typically due to server limitations: %2F, %00 and %5C sequences in paths may also be blocked by some web servers, and the empty path segment can also cause problems. So in general it's not possible to fit all possible byte sequences into a path component.

warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777

Am using Mountain Lion. What I did was Look for /usr/local and Get Info. On it there is Sharing and Permissions. Make sure that its only the user and Admin are the only ones who have read and write permissions. Anyone else should have read access only. That sorted my problem.

Its normally helpful is your Run disk utilities and repair permissions too.

jQuery has deprecated synchronous XMLHTTPRequest

My workabout: I use asynchronous requests dumping the code to a buffer. I have a loop checking the buffer every second. When the dump has arrived to the buffer I execute the code. I also use a timeout. For the end user the page works as if synchronous requests would be used.

How do I increase modal width in Angular UI Bootstrap?

You can do this in very simple way using size property of angular modal.

var modal = $modal.open({
                    templateUrl: "/partials/welcome",
                    controller: "welcomeCtrl",
                    backdrop: "static",
                    scope: $scope,
                    size:'lg' // you can try different width like 'sm', 'md'
                });

How to pass ArrayList of Objects from one to another activity using Intent in android?

You can Pass Arraylist/Pojo using bundle like this ,

Intent intent = new Intent(MainActivity.this, SecondActivity.class);
Bundle args = new Bundle();
                        args.putSerializable("imageSliders",(Serializable)allStoriesPojo.getImageSliderPojos());
                        intent.putExtra("BUNDLE",args);
 startActivity(intent); 

Get those values in SecondActivity like this

  Intent intent = getIntent();
        Bundle args = intent.getBundleExtra("BUNDLE");
  String filter = bundle.getString("imageSliders");

Ant is using wrong java version

You can use the target and source properties on the javac tag to set a target runtime. The example below will compile any source code to target version 1.4 on any compiler that supports version 1.4 or later.

<javac compiler="classic" taskname="javac" includeAntRuntime="no" fork=" deprecation="true" target="1.4" source="1.4" srcdir="${src}" destdir="${classes}">

Note: The 'srcdir' and 'destdir' are property values set else where in the build script, e.g. <property name="classes" value="c:/classes" />

How to save a git commit message from windows cmd?

I believe the REAL answer to this question is an explanation as to how you configure what editor to use by default, if you are not comfortable with Vim.

This is how to configure Notepad for example, useful in Windows:

git config --global core.editor "notepad"

Gedit, more Linux friendly:

git config --global core.editor "gedit"

You can read the current configuration like this:

git config core.editor

Initialize class fields in constructor or at declaration?

In C# it doesn't matter. The two code samples you give are utterly equivalent. In the first example the C# compiler (or is it the CLR?) will construct an empty constructor and initialise the variables as if they were in the constructor (there's a slight nuance to this that Jon Skeet explains in the comments below). If there is already a constructor then any initialisation "above" will be moved into the top of it.

In terms of best practice the former is less error prone than the latter as someone could easily add another constructor and forget to chain it.

Subscripts in plots in R

If you are looking to have multiple subscripts in one text then use the star(*) to separate the sections:

plot(1:10, xlab=expression('hi'[5]*'there'[6]^8*'you'[2]))

How to select specific columns in laravel eloquent

Table::where('id', 1)->get(['name','surname']);

How to align 3 divs (left/center/right) inside another div?

#warpcontainer  {width:800px; height:auto; border: 1px solid #000; float:left; }
#warpcontainer2 {width:260px; height:auto; border: 1px solid #000; float:left; clear:both; margin-top:10px }

Get first n characters of a string

It's best to abstract you're code like so (notice the limit is optional and defaults to 10):

print limit($string);


function limit($var, $limit=10)
{
    if ( strlen($var) > $limit )
    {
        return substr($string, 0, $limit) . '...';
    }
    else
    {
        return $var;
    }
}

What is the difference between mocking and spying when using Mockito?

Spy can be useful when you want to create unit tests for legacy code.

I have created a runable example here https://www.surasint.com/mockito-with-spy/ , I copy some of it here.

If you have something like this code:

public void transfer(  DepositMoneyService depositMoneyService, WithdrawMoneyService withdrawMoneyService, 
             double amount, String fromAccount, String toAccount){
    withdrawMoneyService.withdraw(fromAccount,amount);
    depositMoneyService.deposit(toAccount,amount);
}

You may don't need spy because you can just mock DepositMoneyService and WithdrawMoneyService.

But with some, legacy code, dependency is in the code like this:

    public void transfer(String fromAccount, String toAccount, double amount){

        this.depositeMoneyService = new DepositMoneyService();
        this.withdrawMoneyService = new WithdrawMoneyService();

        withdrawMoneyService.withdraw(fromAccount,amount);
        depositeMoneyService.deposit(toAccount,amount);
    }

Yes, you can change to the first code but then API is changed. If this method is being used by many places, you have to change all of them.

Alternative is that you can extract the dependency out like this:

    public void transfer(String fromAccount, String toAccount, double amount){
        this.depositeMoneyService = proxyDepositMoneyServiceCreator();
        this.withdrawMoneyService = proxyWithdrawMoneyServiceCreator();

        withdrawMoneyService.withdraw(fromAccount,amount);
        depositeMoneyService.deposit(toAccount,amount);
    }
    DepositMoneyService proxyDepositMoneyServiceCreator() {
        return new DepositMoneyService();
    }

    WithdrawMoneyService proxyWithdrawMoneyServiceCreator() {
        return new WithdrawMoneyService();
    }

Then you can use the spy the inject the dependency like this:

DepositMoneyService mockDepositMoneyService = mock(DepositMoneyService.class);
        WithdrawMoneyService mockWithdrawMoneyService = mock(WithdrawMoneyService.class);

    TransferMoneyService target = spy(new TransferMoneyService());

    doReturn(mockDepositMoneyService)
            .when(target).proxyDepositMoneyServiceCreator();

    doReturn(mockWithdrawMoneyService)
            .when(target).proxyWithdrawMoneyServiceCreator();

More detail in the link above.

How to sum up an array of integers in C#

If you don't prefer LINQ, it is better to use foreach loop to avoid out of index.

int[] arr = new int[] { 1, 2, 3 };
int sum = 0;
foreach (var item in arr)
{
   sum += item;
}

Setting a minimum/maximum character count for any character using a regular expression

It's usually the metacharacter . when not inside a character class.

So use ^.{1,35}$. However, dot does not include newlines unless the dot-all modifier is applied against it.

You can use ^[\S\s]{1,35}$ without any modifiers, and this includes newlines as well.

Find and replace entire mysql database

sqldump to a text file, find/replace, re-import the sqldump.

Dump the database to a text file
mysqldump -u root -p[root_password] [database_name] > dumpfilename.sql

Restore the database after you have made changes to it.
mysql -u root -p[root_password] [database_name] < dumpfilename.sql

How do you clear your Visual Studio cache on Windows Vista?

I experienced this today. The value in Config was the updated one but the application would return the older value, stop and starting the solution did nothing.

So I cleared the .Net Temp folder.

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files

It shouldn't create bugs but to be safe close your solution down first. Clear the Temporary ASP.NET Files then load up your solution.

My issue was sorted.

NUnit vs. MbUnit vs. MSTest vs. xUnit.net

It's not a big deal, it's pretty easy to switch between them. MSTest being integrated isn't a big deal either, just grab testdriven.net.

Like the previous person said pick a mocking framework, my favourite at the moment is Moq.

How to get the sign, mantissa and exponent of a floating point number

See this IEEE_754_types.h header for the union types to extract: float, double and long double, (endianness handled). Here is an extract:

/*
** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
**  Single Precision (float)  --  Standard IEEE 754 Floating-point Specification
*/

# define IEEE_754_FLOAT_MANTISSA_BITS (23)
# define IEEE_754_FLOAT_EXPONENT_BITS (8)
# define IEEE_754_FLOAT_SIGN_BITS     (1)

.
.
.

# if (IS_BIG_ENDIAN == 1)
    typedef union {
        float value;
        struct {
            __int8_t   sign     : IEEE_754_FLOAT_SIGN_BITS;
            __int8_t   exponent : IEEE_754_FLOAT_EXPONENT_BITS;
            __uint32_t mantissa : IEEE_754_FLOAT_MANTISSA_BITS;
        };
    } IEEE_754_float;
# else
    typedef union {
        float value;
        struct {
            __uint32_t mantissa : IEEE_754_FLOAT_MANTISSA_BITS;
            __int8_t   exponent : IEEE_754_FLOAT_EXPONENT_BITS;
            __int8_t   sign     : IEEE_754_FLOAT_SIGN_BITS;
        };
    } IEEE_754_float;
# endif

And see dtoa_base.c for a demonstration of how to convert a double value to string form.

Furthermore, check out section 1.2.1.1.4.2 - Floating-Point Type Memory Layout of the C/CPP Reference Book, it explains super well and in simple terms the memory representation/layout of all the floating-point types and how to decode them (w/ illustrations) following the actually IEEE 754 Floating-Point specification.

It also has links to really really good ressources that explain even deeper.

What is MVC and what are the advantages of it?

MVC is just a general design pattern that, in the context of lean web app development, makes it easy for the developer to keep the HTML markup in an app’s presentation layer (the view) separate from the methods that receive and handle client requests (the controllers) and the data representations that are returned within the view (the models). It’s all about separation of concerns, that is, keeping code that serves one functional purpose (e.g. handling client requests) sequestered from code that serves an entirely different functional purpose (e.g. representing data).

It’s the same principle for why anybody who’s spent more than 5 min trying to build a website can appreciate the need to keep your HTML markup, JavaScript, and CSS in separate files: If you just dump all of your code into a single file, you end up with spaghetti that’s virtually un-editable later on.

Since you asked for possible "cons": I’m no authority on software architecture design, but based on my experience developing in MVC, I think it’s also important to point out that following a strict, no-frills MVC design pattern is most useful for 1) lightweight web apps, or 2) as the UI layer of a larger enterprise app. I’m surprised this specification isn’t talked about more, because MVC contains no explicit definitions for your business logic, domain models, or really anything in the data access layer of your app. When I started developing in ASP.NET MVC (i.e. before I knew other software architectures even existed), I would end up with very bloated controllers or even view models chock full of business logic that, had I been working on enterprise applications, would have made it difficult for other devs who were unfamiliar with my code to modify (i.e. more spaghetti).

Reading a text file using OpenFileDialog in windows forms

for this approach, you will need to add system.IO to your references by adding the next line of code below the other references near the top of the c# file(where the other using ****.** stand).

using System.IO;

this next code contains 2 methods of reading the text, the first will read single lines and stores them in a string variable, the second one reads the whole text and saves it in a string variable(including "\n" (enters))

both should be quite easy to understand and use.


    string pathToFile = "";//to save the location of the selected object
    private void openToolStripMenuItem_Click(object sender, EventArgs e)
    {
        OpenFileDialog theDialog = new OpenFileDialog();
        theDialog.Title = "Open Text File";
        theDialog.Filter = "TXT files|*.txt";
        theDialog.InitialDirectory = @"C:\";
        if (theDialog.ShowDialog() == DialogResult.OK)
        {
            MessageBox.Show(theDialog.FileName.ToString());
            pathToFile = theDialog.FileName;//doesn't need .tostring because .filename returns a string// saves the location of the selected object

        }

        if (File.Exists(pathToFile))// only executes if the file at pathtofile exists//you need to add the using System.IO reference at the top of te code to use this
        {
            //method1
            string firstLine = File.ReadAllLines(pathToFile).Skip(0).Take(1).First();//selects first line of the file
            string secondLine = File.ReadAllLines(pathToFile).Skip(1).Take(1).First();

            //method2
            string text = "";
            using(StreamReader sr =new StreamReader(pathToFile))
            {
                text = sr.ReadToEnd();//all text wil be saved in text enters are also saved
            }
        }
    }

To split the text you can use .Split(" ") and use a loop to put the name back into one string. if you don't want to use .Split() then you could also use foreach and ad an if statement to split it where needed.


to add the data to your class you can use the constructor to add the data like:

  public Employee(int EMPLOYEENUM, string NAME, string ADRESS, double WAGE, double HOURS)
        {
            EmployeeNum = EMPLOYEENUM;
            Name = NAME;
            Address = ADRESS;
            Wage = WAGE;
            Hours = HOURS;
        }

or you can add it using the set by typing .variablename after the name of the instance(if they are public and have a set this will work). to read the data you can use the get by typing .variablename after the name of the instance(if they are public and have a get this will work).

Manipulate a url string by adding GET parameters

 public function addGetParamToUrl($url, $params)
{
    foreach ($params as $param) {
         if (strpos($url, "?"))
        {
            $url .= "&" .http_build_query($param); 
        }
        else
        {
            $url .= "?" .http_build_query($param); 
        }
    }
    return $url;
}

uncaught syntaxerror unexpected token U JSON

I was getting this message while validating (in MVC project). For me, adding ValidationMessageFor element fixed the issue.

To be precise, line number 43 in jquery.validate.unobtrusive.js caused the issue:

  replace = $.parseJSON(container.attr("data-valmsg-replace")) !== false;

CSS : center form in page horizontally and vertically

How about using a grid? it's 2019 and support is reasonable

_x000D_
_x000D_
body {_x000D_
  margin: 0;_x000D_
  padding: 0;_x000D_
  background-color: red;_x000D_
}_x000D_
_x000D_
.content {_x000D_
  display: grid;_x000D_
  background-color: bisque;_x000D_
  height: 100vh;_x000D_
  place-items: center;_x000D_
}
_x000D_
<!DOCTYPE html>_x000D_
<html>_x000D_
<body>_x000D_
<div class="content">_x000D_
  <form action="#" method="POST">_x000D_
    <fieldset>_x000D_
      <legend>Information:</legend>_x000D_
      <label for="name">Name:</label>_x000D_
      <input type="text" id="name" name="user_name">_x000D_
    </fieldset>_x000D_
    <button type="button" formmethod="POST" formaction="#">Submit</button>_x000D_
  </form>_x000D_
 </div>_x000D_
 </body>_x000D_
 </html>
_x000D_
_x000D_
_x000D_

How to persist data in a dockerized postgres database using volumes

I think you just need to create your volume outside docker first with a docker create -v /location --name and then reuse it.

And by the time I used to use docker a lot, it wasn't possible to use a static docker volume with dockerfile definition so my suggestion is to try the command line (eventually with a script ) .

Import Maven dependencies in IntelliJ IDEA

Maven - Reimport did not work for me. I have Spring project in STS(Eclipse) and my solution is to import project to IDEA like so:

1) File - New - Project from Existing Sources... - select directory - choose Eclipse.
2) Set Maven autoimport to true in settings.
3) Then right click in pom.xml and choose Add as Maven Project.

After this it has imported everything.

Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.

As an complement to Stefan Steiger answer: (as it doesn't look nice as a comment)

Extending String prototype:

String.prototype.b64encode = function() { 
    return btoa(unescape(encodeURIComponent(this))); 
};
String.prototype.b64decode = function() { 
    return decodeURIComponent(escape(atob(this))); 
};

Usage:

var str = "äöüÄÖÜçéèñ";
var encoded = str.b64encode();
console.log( encoded.b64decode() );

NOTE:

As stated in the comments, using unescape is not recommended as it may be removed in the future:

Warning: Although unescape() is not strictly deprecated (as in "removed from the Web standards"), it is defined in Annex B of the ECMA-262 standard, whose introduction states: … All of the language features and behaviours specified in this annex have one or more undesirable characteristics and in the absence of legacy usage would be removed from this specification.

Note: Do not use unescape to decode URIs, use decodeURI or decodeURIComponent instead.

Client to send SOAP request and receive response

I got this simple solution here:

Sending SOAP request and receiving response in .NET 4.0 C# without using the WSDL or proxy classes:

class Program
    {
        /// <summary>
        /// Execute a Soap WebService call
        /// </summary>
        public static void Execute()
        {
            HttpWebRequest request = CreateWebRequest();
            XmlDocument soapEnvelopeXml = new XmlDocument();
            soapEnvelopeXml.LoadXml(@"<?xml version=""1.0"" encoding=""utf-8""?>
                <soap:Envelope xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/"">
                  <soap:Body>
                    <HelloWorld xmlns=""http://tempuri.org/"" />
                  </soap:Body>
                </soap:Envelope>");

            using (Stream stream = request.GetRequestStream())
            {
                soapEnvelopeXml.Save(stream);
            }

            using (WebResponse response = request.GetResponse())
            {
                using (StreamReader rd = new StreamReader(response.GetResponseStream()))
                {
                    string soapResult = rd.ReadToEnd();
                    Console.WriteLine(soapResult);
                }
            }
        }
        /// <summary>
        /// Create a soap webrequest to [Url]
        /// </summary>
        /// <returns></returns>
        public static HttpWebRequest CreateWebRequest()
        {
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(@"http://localhost:56405/WebService1.asmx?op=HelloWorld");
            webRequest.Headers.Add(@"SOAP:Action");
            webRequest.ContentType = "text/xml;charset=\"utf-8\"";
            webRequest.Accept = "text/xml";
            webRequest.Method = "POST";
            return webRequest;
        }

        static void Main(string[] args)
        {
            Execute();
        }
    }

Why is January month 0 in Java Calendar?

It isn't exactly defined as zero per se, it's defined as Calendar.January. It is the problem of using ints as constants instead of enums. Calendar.January == 0.

This certificate has an invalid issuer Apple Push Services

In Apple's Developer's portal, add a new certificate, and when asked "What type of certificate do you need?" choose "WorldWide developer relations certificate". Generate the new certificate, download and install. The moment you do that, you will no longer see the message you have described.

Edit:
The certificate can be downloaded from the following page: https://www.apple.com/certificateauthority/ You can choose one of the following two certificates: "WWDR Certificate (Expiring 02/07/23)" or "WWDR Certificate (Expiring 02/14/16)"

How to access the SMS storage on Android?

For a concrete example of accessing the SMS/MMS database, take a look at gTalkSMS.

unique combinations of values in selected columns in pandas data frame and count

Slightly related, I was looking for the unique combinations and I came up with this method:

def unique_columns(df,columns):

    result = pd.Series(index = df.index)

    groups = meta_data_csv.groupby(by = columns)
    for name,group in groups:
       is_unique = len(group) == 1
       result.loc[group.index] = is_unique

    assert not result.isnull().any()

    return result

And if you only want to assert that all combinations are unique:

df1.set_index(['A','B']).index.is_unique

Use jQuery to change an HTML tag?

Once a dom element is created, the tag is immutable, I believe. You'd have to do something like this:

$(this).replaceWith($('<h5>' + this.innerHTML + '</h5>'));

Center Align on a Absolutely Positioned Div

Yes:

div#thing { text-align:center; }

Change the name of a key in dictionary

I haven't seen this exact answer:

dict['key'] = value

You can even do this to object attributes. Make them into a dictionary by doing this:

dict = vars(obj)

Then you can manipulate the object attributes like you would a dictionary:

dict['attribute'] = value

Google Maps Api v3 - find nearest markers

The formula above didn't work for me, but I used this without any issue. Pass your current location to the function, and loop through an array of markers to find the closest:

function find_closest_marker( lat1, lon1 ) {    
    var pi = Math.PI;
    var R = 6371; //equatorial radius
    var distances = [];
    var closest = -1;

    for( i=0;i<markers.length; i++ ) {  
        var lat2 = markers[i].position.lat();
        var lon2 = markers[i].position.lng();

        var chLat = lat2-lat1;
        var chLon = lon2-lon1;

        var dLat = chLat*(pi/180);
        var dLon = chLon*(pi/180);

        var rLat1 = lat1*(pi/180);
        var rLat2 = lat2*(pi/180);

        var a = Math.sin(dLat/2) * Math.sin(dLat/2) + 
                    Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(rLat1) * Math.cos(rLat2); 
        var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
        var d = R * c;

        distances[i] = d;
        if ( closest == -1 || d < distances[closest] ) {
            closest = i;
        }
    }

    // (debug) The closest marker is:
    console.log(markers[closest]);
}

Where/how can I download (and install) the Microsoft.Jet.OLEDB.4.0 for Windows 8, 64 bit?

Make sure to target x86 on your project in Visual Studio. This should fix your trouble.

Add a border outside of a UIView (instead of inside)

Unfortunately, there isn't simply a little property you can set to align the border to the outside. It draws aligned to the inside because the UIViews default drawing operations draw within its bounds.

The simplest solution that comes to mind would be to expand the UIView by the size of the border width when applying the border:

CGFloat borderWidth = 2.0f;

self.frame = CGRectInset(self.frame, -borderWidth, -borderWidth);
self.layer.borderColor = [UIColor yellowColor].CGColor;
self.layer.borderWidth = borderWidth;

ADB.exe is obsolete and has serious performance problems

This can also be an issue with hyper-v settings on Windows 10 pro. Because with this error I was facing BSOD - https://www.techclassy.com/fix-hypervisor-error-bsod/

Spring @Autowired and @Qualifier

The @Qualifier annotation is used to resolve the autowiring conflict, when there are multiple beans of same type.

The @Qualifier annotation can be used on any class annotated with @Component or on methods annotated with @Bean. This annotation can also be applied on constructor arguments or method parameters.

Ex:-

public interface Vehicle {
     public void start();
     public void stop();
}

There are two beans, Car and Bike implements Vehicle interface

@Component(value="car")
public class Car implements Vehicle {

     @Override
     public void start() {
           System.out.println("Car started");
     }

     @Override
     public void stop() {
           System.out.println("Car stopped");
     }
 }

@Component(value="bike")
public class Bike implements Vehicle {

     @Override
     public void start() {
          System.out.println("Bike started");
     }

     @Override
     public void stop() {
          System.out.println("Bike stopped");
     }
}

Injecting Bike bean in VehicleService using @Autowired with @Qualifier annotation. If you didn't use @Qualifier, it will throw NoUniqueBeanDefinitionException.

@Component
public class VehicleService {

    @Autowired
    @Qualifier("bike")
    private Vehicle vehicle;

    public void service() {
         vehicle.start();
         vehicle.stop();
    }
}

Reference:- @Qualifier annotation example

Determine which MySQL configuration file is being used

For people running windows server with mysql as a service, an easy way to find out what config file you are running is to open up the services control panel, find your mysql service (in my case 'MYSQL56'), right click and click properties. Then from here you can check the "Path to Executable" which should have a defaults-file switch which points to where your config file is.

How Do I Upload Eclipse Projects to GitHub?

For eclipse i think EGIT is the best option. This guide http://rogerdudler.github.io/git-guide/index.html will help you understand git quick.

Access-Control-Allow-Origin: * in tomcat

The issue arose because of not including jar file as part of the project. I was just including it in tomcat lib. Using the below in web.xml works now:

<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>
        org.springframework.web.filter.DelegatingFilterProxy
    </filter-class>
</filter>

 <filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<filter>
    <filter-name>CORS</filter-name>
    <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>

    <init-param>
        <param-name>cors.allowOrigin</param-name>
        <param-value>*</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportsCredentials</param-name>
        <param-value>false</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportedHeaders</param-name>
        <param-value>accept, authorization, origin</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportedMethods</param-name>
        <param-value>GET, POST, HEAD, OPTIONS</param-value>
    </init-param>
</filter>


<filter-mapping>
    <filter-name>CORS</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

And the below in your project dependency:

<dependency>
    <groupId>com.thetransactioncompany</groupId>
    <artifactId>cors-filter</artifactId>
    <version>1.3.2</version>
</dependency>

How do I return JSON without using a template in Django?

If you want to pass the result as a rendered template you have to load and render a template, pass the result of rendering it to the json.This could look like that:

from django.template import loader, RequestContext

#render the template
t=loader.get_template('sample/sample.html')
context=RequestContext()
html=t.render(context)

#create the json
result={'html_result':html)
json = simplejson.dumps(result)

return HttpResponse(json)

That way you can pass a rendered template as json to your client. This can be useful if you want to completely replace ie. a containing lots of different elements.

How to convert interface{} to string?

You need to add type assertion .(string). It is necessary because the map is of type map[string]interface{}:

host := arguments["<host>"].(string) + ":" + arguments["<port>"].(string)

Latest version of Docopt returns Opts object that has methods for conversion:

host, err := arguments.String("<host>")
port, err := arguments.String("<port>")
host_port := host + ":" + port

Group array items using object

Another option is using reduce() and new Map() to group the array. Use Spread syntax to convert set object into an array.

_x000D_
_x000D_
var myArray = [{"group":"one","color":"red"},{"group":"two","color":"blue"},{"group":"one","color":"green"},{"group":"one","color":"black"}]_x000D_
_x000D_
var result = [...myArray.reduce((c, {group,color}) => {_x000D_
  if (!c.has(group)) c.set(group, {group,color: []});_x000D_
  c.get(group).color.push(color);_x000D_
  return c;_x000D_
}, new Map()).values()];_x000D_
_x000D_
console.log(result);
_x000D_
_x000D_
_x000D_

How to use an output parameter in Java?

Java does not support output parameters. You can use a return value, or pass in an object as a parameter and modify the object.

Getting "Cannot call a class as a function" in my React Project

I experienced this when writing an import statement wrong while importing a function, rather than a class. If removeMaterial is a function in another module:

Right:

import { removeMaterial } from './ClaimForm';

Wrong:

import removeMaterial from './ClaimForm';

How can I write to the console in PHP?

Though this is an old question, I've been looking for this. Here's my compilation of some solutions answered here and some other ideas found elsewhere to get a one-size-fits-all solution.

CODE :

    // Post to browser console
    function console($data, $is_error = false, $file = false, $ln = false) {
        if(!function_exists('console_wer')) {
            function console_wer($data, $is_error = false, $bctr, $file, $ln) {
                echo '<div display="none">'.'<script type="text/javascript">'.(($is_error!==false) ? 'if(typeof phperr_to_cns === \'undefined\') { var phperr_to_cns = 1; document.addEventListener("DOMContentLoaded", function() { setTimeout(function(){ alert("Alert. see console."); }, 4000); });  }' : '').' console.group("PHP '.(($is_error) ? 'error' : 'log').' from "+window.atob("'.base64_encode((($file===false) ? $bctr['file'] : $file)).'")'.((($ln!==false && $file!==false) || $bctr!==false) ? '+" on line '.(($ln===false) ? $bctr['line'] : $ln).' :"' : '+" :"').'); console.'.(($is_error) ? 'error' : 'log').'('.((is_array($data)) ? 'JSON.parse(window.atob("'.base64_encode(json_encode($data)).'"))' : '"'.$data.'"').'); console.groupEnd();</script></div>'; return true;
            }
        }
        return @console_wer($data, $is_error, (($file===false && $ln===false) ? array_shift(debug_backtrace()) : false), $file, $ln);
    }
    
    //PHP Exceptions handler
    function exceptions_to_console($svr, $str, $file, $ln) {
        if(!function_exists('severity_tag')) {
            function severity_tag($svr) {
                $names = [];
                $consts = array_flip(array_slice(get_defined_constants(true)['Core'], 0, 15, true));
                foreach ($consts as $code => $name) {
                    if ($svr & $code) $names []= $name;
                }
                return join(' | ', $names);
            }
        }
        if (error_reporting() == 0) {
            return false;
        }
        if(error_reporting() & $svr) {
            console(severity_tag($svr).' : '.$str, true, $file, $ln);
        }
    }

    // Divert php error traffic
    error_reporting(E_ALL);  
    ini_set("display_errors", "1");
    set_error_handler('exceptions_to_console');

TESTS & USAGE :

Usage is simple. Include first function for posting to console manually. Use second function for diverting php exception handling. Following test should give an idea.

    // Test 1 - Auto - Handle php error and report error with severity info
    $a[1] = 'jfksjfks';
    try {
          $b = $a[0];
    } catch (Exception $e) {
          echo "jsdlkjflsjfkjl";
    }

    // Test 2 - Manual - Without explicitly providing file name and line no.
          console(array(1 => "Hi", array("hellow")), false);
    
    // Test 3 - Manual - Explicitly providing file name and line no.
          console(array(1 => "Error", array($some_result)), true, 'my file', 2);
    
    // Test 4 - Manual - Explicitly providing file name only.
          console(array(1 => "Error", array($some_result)), true, 'my file');
    

EXPLANATION :

  • The function console($data, $is_error, $file, $fn) takes string or array as first argument and posts it on console using js inserts.

  • Second argument is a flag to differentiate normal logs against errors. For errors, we're adding event listeners to inform us through alerts if any errors were thrown, also highlighting in console. This flag is defaulted to false.

  • Third and fourth arguments are explicit declarations of file and line numbers, which is optional. If absent, they're defaulted to using the predefined php function debug_backtrace() to fetch them for us.

  • Next function exceptions_to_console($svr, $str, $file, $ln) has four arguments in the order called by php default exception handler. Here, the first argument is severity, which we further crosscheck with predefined constants using function severity_tag($code) to provide more info on error.

NOTICE :

  • Above code uses JS functions and methods that are not available in older browsers. For compatibility with older versions, it needs replacements.

  • Above code is for testing environments, where you alone have access to the site. Do not use this in live (production) websites.

SUGGESTIONS :

  • First function console() threw some notices, so I've wrapped them within another function and called it using error control operator '@'. This can be avoided if you didn't mind the notices.

  • Last but not least, alerts popping up can be annoying while coding. For this I'm using this beep (found in solution : https://stackoverflow.com/a/23395136/6060602) instead of popup alerts. It's pretty cool and possibilities are endless, you can play your favorite tunes and make coding less stressful.

How do I remove a submodule?

What I'm currently doing Dec 2012 (combines most of these answers):

oldPath="vendor/example"
git config -f .git/config --remove-section "submodule.${oldPath}"
git config -f .gitmodules --remove-section "submodule.${oldPath}"
git rm --cached "${oldPath}"
rm -rf "${oldPath}"              ## remove src (optional)
rm -rf ".git/modules/${oldPath}" ## cleanup gitdir (optional housekeeping)
git add .gitmodules
git commit -m "Removed ${oldPath}"

Can I draw rectangle in XML?

Yes you can and here is one I made earlier:

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/listview_background_shape">
    <stroke android:width="2dp" android:color="#ff207d94" />
    <padding android:left="2dp"
        android:top="2dp"
        android:right="2dp"
        android:bottom="2dp" />
    <corners android:radius="5dp" />
    <solid android:color="#ffffffff" />
</shape>

You can create a new XML file inside the drawable folder, and add the above code, then save it as rectangle.xml.

To use it inside a layout you would set the android:background attribute to the new drawable shape. The shape we have defined does not have any dimensions, and therefore will take the dimensions of the View that is defined in the layout.

So putting it all together:

<View
    android:id="@+id/myRectangleView"
    android:layout_width="200dp"
    android:layout_height="50dp"
    android:background="@drawable/rectangle"/>

Finally; you can set this rectangle to be the background of any View, although for ImageViews you would use android:src. This means you could use the rectangle as the background for ListViews, TextViews...etc.

UTF-8, UTF-16, and UTF-32

I'm surprised this question is 11yrs old and not one of the answers mentioned the #1 advantage of utf-8.

utf-8 generally works even with programs that are not utf-8 aware. That's partly what it was designed for. Other answers mention that the first 128 code points are the same as ASCII. All other code points are generated by 8bit values with the high bit set (values from 128 to 255) so that from the POV of a non-unicode aware program it just sees strings as ASCII with some extra characters.

As an example let's say you wrote a program to add line numbers that effectively does this (and to keep it simple let's assume end of line is just ASCII 13)

// pseudo code

function readLine
  if end of file
     return null
  read bytes (8bit values) into string until you hit 13 or end or file
  return string

function main
  lineNo = 1
  do {
    s = readLine
    if (s == null) break;
    print lineNo++, s
  }  

Passing a utf-8 file to this program will continue to work. Similarly, splitting on tabs, commas, parsing for ASCII quotes, or other parsing for which only ASCII values are significant all just work with utf-8 because no ASCII value appear in utf-8 except when they are actually meant to be those ASCII values

Some other answers or comments mentions that utf-32 has the advantage that you can treat each codepoint separately. This would suggest for example you could take a string like "ABCDEFGHI" and split it at every 3rd code point to make

ABC
DEF
GHI

This is false. Many code points affect other code points. For example the color selector code points that lets you choose between ?????. If you split at any arbitrary code point you'll break those.

Another example is the bidirectional code points. The following paragraph was not entered backward. It is just preceded by the 0x202E codepoint

  • ?This line is not typed backward it is only displayed backward

So no, utf-32 will not let you just randomly manipulate unicode strings without a thought to their meanings. It will let you look at each codepoint with no extra code.

FYI though, utf-8 was designed so that looking at any individual byte you can find out the start of the current code point or the next code point.

If you take a arbitrary byte in utf-8 data. If it is < 128 it's the correct code point by itself. If it's >= 128 and < 192 (the top 2 bits are 10) then to find the start of the code point you need to look the preceding byte until you find a byte with a value >= 192 (the top 2 bits are 11). At that byte you've found the start of a codepoint. That byte encodes how many subsequent bytes make the code point.

If you want to find the next code point just scan until the byte < 128 or >= 192 and that's the start of the next code point.

Num Bytes 1st code point last code point Byte 1 Byte 2 Byte 3 Byte 4
1 U+0000 U+007F 0xxxxxxx
2 U+0080 U+07FF 110xxxxx 10xxxxxx
3 U+0800 U+FFFF 1110xxxx 10xxxxxx 10xxxxxx
4 U+10000 U+10FFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

Where xxxxxx are the bits of the code point. Concatenate the xxxx bits from the bytes to get the code point

Returning JSON response from Servlet to Javascript/JSP page

I used JSONObject as shown below in Servlet.

    JSONObject jsonReturn = new JSONObject();

    NhAdminTree = AdminTasks.GetNeighborhoodTreeForNhAdministrator( connection, bwcon, userName);

    map = new HashMap<String, String>();
    map.put("Status", "Success");
    map.put("FailureReason", "None");
    map.put("DataElements", "2");

    jsonReturn = new JSONObject();
    jsonReturn.accumulate("Header", map);

    List<String> list = new ArrayList<String>();
    list.add(NhAdminTree);
    list.add(userName);

    jsonReturn.accumulate("Elements", list);

The Servlet returns this JSON object as shown below:

    response.setContentType("application/json");
    response.getWriter().write(jsonReturn.toString());

This Servlet is called from Browser using AngularJs as below

$scope.GetNeighborhoodTreeUsingPost = function(){
    alert("Clicked GetNeighborhoodTreeUsingPost : " + $scope.userName );

    $http({

        method: 'POST',
        url : 'http://localhost:8080/EPortal/xlEPortalService',
        headers: {
           'Content-Type': 'application/json'
         },
        data : {
            'action': 64,
            'userName' : $scope.userName
        }
    }).success(function(data, status, headers, config){
        alert("DATA.header.status : " + data.Header.Status);
        alert("DATA.header.FailureReason : " + data.Header.FailureReason);
        alert("DATA.header.DataElements : " + data.Header.DataElements);
        alert("DATA.elements : " + data.Elements);

    }).error(function(data, status, headers, config) {
        alert(data + " : " + status + " : " + headers + " : " + config);
    });

};

This code worked and it is showing correct data in alert dialog box:

Data.header.status : Success

Data.header.FailureReason : None

Data.header.DetailElements : 2

Data.Elements : Coma seperated string values i.e. NhAdminTree, userName

Twitter Bootstrap - add top space between rows

Ok just to let you know what's happened then, i fixed using some new classes as Acyra says above:

.top5 { margin-top:5px; }
.top7 { margin-top:7px; }
.top10 { margin-top:10px; }
.top15 { margin-top:15px; }
.top17 { margin-top:17px; }
.top30 { margin-top:30px; }

whenever i want i do <div class="row top7"></div>

for better responsive you can add margin-top:7% instead of 5px for example :D

How can I get date in application run by node.js?

You do that as you would in a browser:

_x000D_
_x000D_
    var datetime = new Date();_x000D_
    console.log(datetime);
_x000D_
_x000D_
_x000D_

How do you use MySQL's source command to import large files in windows

use mysql source command to avoid redirection failures, especially on windows.

mysql [-u <username>] [-p<password>] <databasename> -e "source /path/to/dump.sql"

where e for "Execute command"

On Windows, please remember to use double quote for sql command.

However, either backslash \ or slash / will work on Windows.

ssh "permissions are too open" error

Using Cygwin in Windows 8.1, there is a command need to be run:

chgrp Users ~/.ssh/id_rsa

Then the solution posted here can be applied, 400 or 600 is OK.

chmod 600 ~/.ssh/id_rsa

Ref: http://vineetgupta.com/blog/cygwin-permissions-bug-on-windows-8

Should I use "camel case" or underscores in python?

for everything related to Python's style guide: i'd recommend you read PEP8.

To answer your question:

Function names should be lowercase, with words separated by underscores as necessary to improve readability.

Remove all the children DOM elements in div

while (node.hasChildNodes()) {
    node.removeChild(node.lastChild);
}

New warnings in iOS 9: "all bitcode will be dropped"

This issue has been recently fixed (Nov 2010) by Google, see https://code.google.com/p/analytics-issues/issues/detail?id=671. But be aware that as a good fix it brings more bugs :)

You will also have to follow the initialisation method listed here: https://developers.google.com/analytics/devguides/collection/ios/v2.

The latest instructions are going to give you a headache because it references utilities not included in the pod. Below will fail with the cocoapod

// Configure tracker from GoogleService-Info.plist.
NSError *configureError;
[[GGLContext sharedInstance] configureWithError:&configureError];
NSAssert(!configureError, @"Error configuring Google services: %@", configureError);

What is the simplest method of inter-process communication between 2 C# processes?

There's also COM.

There are technicalities, but I'd say the advantage is that you'll be able to call methods that you can define.

MSDN offers C# COM interop tutorials. Please search because these links do change.

To get started rightaway go here...

Always show vertical scrollbar in <select>

add:

overflow-y: scroll

in your css bud.

Compare every item to every other item in ArrayList

What's the problem with using for loop inside, just like outside?

for (int j = i + 1; j < list.size(); ++j) {
    ...
}

In general, since Java 5, I used iterators only once or twice.

How can I write text on a HTML5 canvas element?

_x000D_
_x000D_
var canvas = document.getElementById("my-canvas");_x000D_
var context = canvas.getContext("2d");_x000D_
_x000D_
context.fillStyle = "blue";_x000D_
context.font = "bold 16px Arial";_x000D_
context.fillText("Zibri", (canvas.width / 2) - 17, (canvas.height / 2) + 8);
_x000D_
#my-canvas {_x000D_
  background: #FF0;_x000D_
}
_x000D_
<canvas id="my-canvas" width="200" height="120"></canvas>
_x000D_
_x000D_
_x000D_

Plot correlation matrix using pandas

Try this function, which also displays variable names for the correlation matrix:

def plot_corr(df,size=10):
    '''Function plots a graphical correlation matrix for each pair of columns in the dataframe.

    Input:
        df: pandas DataFrame
        size: vertical and horizontal size of the plot'''

    corr = df.corr()
    fig, ax = plt.subplots(figsize=(size, size))
    ax.matshow(corr)
    plt.xticks(range(len(corr.columns)), corr.columns);
    plt.yticks(range(len(corr.columns)), corr.columns);

Android: Bitmaps loaded from gallery are rotated in ImageView

The methods below scales AND rotates the bitmap according to the orientation:

public Bitmap scaleAndRotateImage(String path, int orientation, final int targetWidth, final int targetHeight)
{
    Bitmap bitmap = null;

    try
    {
        // Check the dimensions of the Image
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        // Adjust the Width and Height
        int sourceWidth, sourceHeight;
        if (orientation == 90 || orientation == 270)
        {
            sourceWidth = options.outHeight;
            sourceHeight = options.outWidth;
        }
        else
        {
            sourceWidth = options.outWidth;
            sourceHeight = options.outHeight;
        }

        // Calculate the maximum required scaling ratio if required and load the bitmap
        if (sourceWidth > targetWidth || sourceHeight > targetHeight)
        {
            float widthRatio = (float)sourceWidth / (float)targetWidth;
            float heightRatio = (float)sourceHeight / (float)targetHeight;
            float maxRatio = Math.max(widthRatio, heightRatio);
            options.inJustDecodeBounds = false;
            options.inSampleSize = (int)maxRatio;
            bitmap = BitmapFactory.decodeFile(path, options);
        }
        else
        {
            bitmap = BitmapFactory.decodeFile(path);
        }

        // We need to rotate the bitmap (if required)
        int orientationInDegrees = exifToDegrees(orientation);
        if (orientation > 0)
        {
            Matrix matrix = new Matrix();
            if (orientation != 0f)
            {
                matrix.preRotate(orientationInDegrees);
            };

            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
        }

        // Re-scale the bitmap if necessary
        sourceWidth = bitmap.getWidth();
        sourceHeight = bitmap.getHeight();

        if (sourceWidth != targetWidth || sourceHeight != targetHeight)
        {
            float widthRatio = (float)sourceWidth / (float)targetWidth;
            float heightRatio = (float)sourceHeight / (float)targetHeight;
            float maxRatio = Math.max(widthRatio, heightRatio);
            sourceWidth = (int)((float)sourceWidth / maxRatio);
            sourceHeight = (int)((float)sourceHeight / maxRatio);
            bitmap = Bitmap.createScaledBitmap(bitmap, sourceWidth, sourceHeight, true);
        }
    }
    catch (Exception e)
    {
        Logger.d("Could not rotate the image");
        Logger.d(e.getMessage());
    }
    return bitmap;
}

Example:

public void getPictureFromDevice(Uri Uri,ImageView imageView)
{
    try
    {
        ExifInterface exifInterface = new ExifInterface(Uri.getPath());
        int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);

        Bitmap bitmap = scaleAndRotateImage(Uri.getPath(), orientation, imageView.getWidth(), imageView.getHeight());
        imageView.setImageBitmap(bitmap);
    }
    catch (OutOfMemoryError outOfMemoryError)
    {
        Logger.d(outOfMemoryError.getLocalizedMessage());
        Logger.d("Failed to load image from filePath (out of memory)");
        Logger.d(Uri.toString());
    }
    catch (Exception e)
    {
        Logger.d("Failed to load image from filePath");
        Logger.d(Uri.toString());
    }
}

How do I auto-submit an upload form when a file is selected?

You can simply call your form's submit method in the onchange event of your file input.

document.getElementById("file").onchange = function() {
    document.getElementById("form").submit();
};

http://jsfiddle.net/cwvc4/73/

How do I use a char as the case in a switch-case?

Using a char when the variable is a string won't work. Using

switch (hello.charAt(0)) 

you will extract the first character of the hello variable instead of trying to use the variable as it is, in string form. You also need to get rid of your space inside

case 'a '

Join between tables in two different databases?

Yes, assuming the account has appropriate permissions you can use:

SELECT <...>
FROM A.table1 t1 JOIN B.table2 t2 ON t2.column2 = t1.column1;

You just need to prefix the table reference with the name of the database it resides in.

Python Infinity - Any caveats?

You can still get not-a-number (NaN) values from simple arithmetic involving inf:

>>> 0 * float("inf")
nan

Note that you will normally not get an inf value through usual arithmetic calculations:

>>> 2.0**2
4.0
>>> _**2
16.0
>>> _**2
256.0
>>> _**2
65536.0
>>> _**2
4294967296.0
>>> _**2
1.8446744073709552e+19
>>> _**2
3.4028236692093846e+38
>>> _**2
1.157920892373162e+77
>>> _**2
1.3407807929942597e+154
>>> _**2
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OverflowError: (34, 'Numerical result out of range')

The inf value is considered a very special value with unusual semantics, so it's better to know about an OverflowError straight away through an exception, rather than having an inf value silently injected into your calculations.

Create an instance of a class from a string

To create an instance of a class from another project in the solution, you can get the assembly indicated by the name of any class (for example BaseEntity) and create a new instance:

  var newClass = System.Reflection.Assembly.GetAssembly(typeof(BaseEntity)).CreateInstance("MyProject.Entities.User");

ADB not responding. You can wait more,or kill "adb.exe" process manually and click 'Restart'

None of the above helped me completely. Although Oventoaster made me think. I had a couple of adb on my system. Removed them almost all.

I am running android studio on ubuntu 14.04 64 bit.

So I checked manually /home/xxxxx/Android/Sdk/platform-tools/adb

where xxxxx was my linux username

this gave

/home/xxxxx/Android/Sdk/platform-tools/adb: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

https://stackoverflow.com/a/27415749/4453157

solved it for me.

static linking only some libraries

From the manpage of ld (this does not work with gcc), referring to the --static option:

You may use this option multiple times on the command line: it affects library searching for -l options which follow it.

One solution is to put your dynamic dependencies before the --static option on the command line.

Another possibility is to not use --static, but instead provide the full filename/path of the static object file (i.e. not using -l option) for statically linking in of a specific library. Example:

# echo "int main() {}" > test.cpp
# c++ test.cpp /usr/lib/libX11.a
# ldd a.out
linux-vdso.so.1 =>  (0x00007fff385cc000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f9a5b233000)
libm.so.6 => /lib/libm.so.6 (0x00007f9a5afb0000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f9a5ad99000)
libc.so.6 => /lib/libc.so.6 (0x00007f9a5aa46000)
/lib64/ld-linux-x86-64.so.2 (0x00007f9a5b53f000)

As you can see in the example, libX11 is not in the list of dynamically-linked libraries, as it was linked statically.

Beware: An .so file is always linked dynamically, even when specified with a full filename/path.

What is the difference between for and foreach?

a for loop is a construct that says "perform this operation n. times".

a foreach loop is a construct that says "perform this operation against each value/object in this IEnumerable"

How to fix "Only one expression can be specified in the select list when the subquery is not introduced with EXISTS" error?

Try this:

 Select 
    Id, 
    Salt, 
    Password, 
    BannedEndDate, 
    (Select Count(*) 
        From LoginFails 
        Where username = '" + LoginModel.Username + "' And IP = '" + Request.ServerVariables["REMOTE_ADDR"] + "')
 From Users 
 Where username = '" + LoginModel.Username + "'

And I recommend you strongly to use parameters in your query to avoid security risks with sql injection attacks!

Hope that helps!

How to make a HTTP request using Ruby on Rails?

You can use Ruby's Net::HTTP class:

require 'net/http'

url = URI.parse('http://www.example.com/index.html')
req = Net::HTTP::Get.new(url.to_s)
res = Net::HTTP.start(url.host, url.port) {|http|
  http.request(req)
}
puts res.body

JavaScript: What are .extend and .prototype used for?

This seems to be the clearest and simplest example to me, this just appends property or replaces existing.

function replaceProperties(copyTo, copyFrom)  {
  for (var property in copyFrom) 
    copyTo[property] =  copyFrom[property]
  return copyTo
}

How to insert a row in an HTML table body in JavaScript

You can use the following example:

<table id="purches">
    <thead>
        <tr>
            <th>ID</th>
            <th>Transaction Date</th>
            <th>Category</th>
            <th>Transaction Amount</th>
            <th>Offer</th>
        </tr>
    </thead>

    <!--  <tr th:each="person: ${list}"    >
            <td><li th:each="person: ${list}" th:text="|${person.description}|"></li></td>
            <td><li th:each="person: ${list}" th:text="|${person.price}|"></li></td>
            <td><li th:each="person: ${list}" th:text="|${person.available}|"></li></td>
            <td><li th:each="person: ${list}" th:text="|${person.from}|"></li></td>
            </tr>
    -->

    <tbody id="feedback">
    </tbody>
</table>

JavaScript file:

$.ajax({
    type: "POST",
    contentType: "application/json",
    url: "/search",
    data: JSON.stringify(search),
    dataType: 'json',
    cache: false,
    timeout: 600000,
    success: function (data) {
        //  var json = "<h4>Ajax Response</h4><pre>"  + JSON.stringify(data, null, 4) + "</pre>";
        // $('#feedback').html(json);
        //
        console.log("SUCCESS: ", data);
        //$("#btn-search").prop("disabled", false);

        for (var i = 0; i < data.length; i++) {
            //$("#feedback").append('<tr><td>' + data[i].accountNumber + '</td><td>' + data[i].category + '</td><td>' + data[i].ssn + '</td></tr>');
            $('#feedback').append('<tr><td>' + data[i].accountNumber + '</td><td>' + data[i].category + '</td><td>' + data[i].ssn + '</td><td>' + data[i].ssn + '</td><td>' + data[i].ssn + '</td></tr>');

            alert(data[i].accountNumber)
        }
    },
    error: function (e) {
        var json = "<h4>Ajax Response</h4><pre>" + e.responseText + "</pre>";
        $('#feedback').html(json);

        console.log("ERROR: ", e);
        $("#btn-search").prop("disabled", false);
    }
});

Simple way to check if a string contains another string in C?

if (strstr(request, "favicon") != NULL) {
    // contains
}

How do I run a single test using Jest?

You can also use f or x to focus or exclude a test. For example

fit('only this test will run', () => {
   expect(true).toBe(false);
});

it('this test will not run', () => {
   expect(true).toBe(false);
});

xit('this test will be ignored', () => {
   expect(true).toBe(false);
});

C# : changing listbox row color?

First use this Namespace:

using System.Drawing;

Add this anywhere on your form:

listBox.DrawMode = DrawMode.OwnerDrawFixed;
listBox.DrawItem += listBox_DrawItem;

Here is the Event Handler:

private void listBox_DrawItem(object sender, DrawItemEventArgs e)
{
     e.DrawBackground();

     Graphics g = e.Graphics;
     g.FillRectangle(new SolidBrush(Color.White), e.Bounds);
     ListBox lb = (ListBox)sender;
     g.DrawString(lb.Items[e.Index].ToString(), e.Font, new SolidBrush(Color.Black), new PointF(e.Bounds.X, e.Bounds.Y));

     e.DrawFocusRectangle();
}

Calculating the area under a curve given a set of coordinates, without knowing the function

The numpy and scipy libraries include the composite trapezoidal (numpy.trapz) and Simpson's (scipy.integrate.simps) rules.

Here's a simple example. In both trapz and simps, the argument dx=5 indicates that the spacing of the data along the x axis is 5 units.

from __future__ import print_function

import numpy as np
from scipy.integrate import simps
from numpy import trapz


# The y values.  A numpy array is used here,
# but a python list could also be used.
y = np.array([5, 20, 4, 18, 19, 18, 7, 4])

# Compute the area using the composite trapezoidal rule.
area = trapz(y, dx=5)
print("area =", area)

# Compute the area using the composite Simpson's rule.
area = simps(y, dx=5)
print("area =", area)

Output:

area = 452.5
area = 460.0

how to create Socket connection in Android?

Here, in this post you will find the detailed code for establishing socket between devices or between two application in the same mobile.

You have to create two application to test below code.

In both application's manifest file, add below permission

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

1st App code: Client Socket

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TableRow
        android:id="@+id/tr_send_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="11dp">

        <EditText
            android:id="@+id/edt_send_message"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginRight="10dp"
            android:layout_marginLeft="10dp"
            android:hint="Enter message"
            android:inputType="text" />

        <Button
            android:id="@+id/btn_send"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:text="Send" />
    </TableRow>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/tr_send_message"
        android:layout_marginTop="25dp"
        android:id="@+id/scrollView2">

        <TextView
            android:id="@+id/tv_reply_from_server"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>
</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView mTextViewReplyFromServer;
    private EditText mEditTextSendMessage;

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

        Button buttonSend = (Button) findViewById(R.id.btn_send);

        mEditTextSendMessage = (EditText) findViewById(R.id.edt_send_message);
        mTextViewReplyFromServer = (TextView) findViewById(R.id.tv_reply_from_server);

        buttonSend.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            case R.id.btn_send:
                sendMessage(mEditTextSendMessage.getText().toString());
                break;
        }
    }

    private void sendMessage(final String msg) {

        final Handler handler = new Handler();
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    //Replace below IP with the IP of that device in which server socket open.
                    //If you change port then change the port number in the server side code also.
                    Socket s = new Socket("xxx.xxx.xxx.xxx", 9002);

                    OutputStream out = s.getOutputStream();

                    PrintWriter output = new PrintWriter(out);

                    output.println(msg);
                    output.flush();
                    BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                    final String st = input.readLine();

                    handler.post(new Runnable() {
                        @Override
                        public void run() {

                            String s = mTextViewReplyFromServer.getText().toString();
                            if (st.trim().length() != 0)
                                mTextViewReplyFromServer.setText(s + "\nFrom Server : " + st);
                        }
                    });

                    output.close();
                    out.close();
                    s.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        thread.start();
    }
}

2nd App Code - Server Socket

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/btn_stop_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="STOP Receiving data"
        android:layout_alignParentTop="true"
        android:enabled="false"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="89dp" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/btn_stop_receiving"
        android:layout_marginTop="35dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <TextView
            android:id="@+id/tv_data_from_client"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>

    <Button
        android:id="@+id/btn_start_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="START Receiving data"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="14dp" />
</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    final Handler handler = new Handler();

    private Button buttonStartReceiving;
    private Button buttonStopReceiving;
    private TextView textViewDataFromClient;
    private boolean end = false;

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

        buttonStartReceiving = (Button) findViewById(R.id.btn_start_receiving);
        buttonStopReceiving = (Button) findViewById(R.id.btn_stop_receiving);
        textViewDataFromClient = (TextView) findViewById(R.id.tv_data_from_client);

        buttonStartReceiving.setOnClickListener(this);
        buttonStopReceiving.setOnClickListener(this);

    }

    private void startServerSocket() {

        Thread thread = new Thread(new Runnable() {

            private String stringData = null;

            @Override
            public void run() {

                try {

                    ServerSocket ss = new ServerSocket(9002);

                    while (!end) {
                        //Server is waiting for client here, if needed
                        Socket s = ss.accept();
                        BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                        PrintWriter output = new PrintWriter(s.getOutputStream());

                        stringData = input.readLine();
                        output.println("FROM SERVER - " + stringData.toUpperCase());
                        output.flush();

                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        updateUI(stringData);
                        if (stringData.equalsIgnoreCase("STOP")) {
                            end = true;
                            output.close();
                            s.close();
                            break;
                        }

                        output.close();
                        s.close();
                    }
                    ss.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        });
        thread.start();
    }

    private void updateUI(final String stringData) {

        handler.post(new Runnable() {
            @Override
            public void run() {

                String s = textViewDataFromClient.getText().toString();
                if (stringData.trim().length() != 0)
                    textViewDataFromClient.setText(s + "\n" + "From Client : " + stringData);
            }
        });
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.btn_start_receiving:

                startServerSocket();
                buttonStartReceiving.setEnabled(false);
                buttonStopReceiving.setEnabled(true);
                break;

            case R.id.btn_stop_receiving:

                //stopping server socket logic you can add yourself
                buttonStartReceiving.setEnabled(true);
                buttonStopReceiving.setEnabled(false);
                break;
        }
    }
}

Read file line by line using ifstream in C++

This is a general solution to loading data into a C++ program, and uses the readline function. This could be modified for CSV files, but the delimiter is a space here.

int n = 5, p = 2;

int X[n][p];

ifstream myfile;

myfile.open("data.txt");

string line;
string temp = "";
int a = 0; // row index 

while (getline(myfile, line)) { //while there is a line
     int b = 0; // column index
     for (int i = 0; i < line.size(); i++) { // for each character in rowstring
          if (!isblank(line[i])) { // if it is not blank, do this
              string d(1, line[i]); // convert character to string
              temp.append(d); // append the two strings
        } else {
              X[a][b] = stod(temp);  // convert string to double
              temp = ""; // reset the capture
              b++; // increment b cause we have a new number
        }
    }

  X[a][b] = stod(temp);
  temp = "";
  a++; // onto next row
}

How can I debug a Perl script?

I would also recommend using the Perl debugger.

However, since you asked about something like shell's -x have a look at the Devel::Trace module which does something similar.

Attach (open) mdf file database with SQL Server Management Studio

i don't know if this answer can be found on the links above, but i just run SQL management studio as Administrator and worked. Hope it helps

Cheers

sqlite copy data from one table to another

I've been wrestling with this, and I know there are other options, but I've come to the conclusion the safest pattern is:

create table destination_old as select * from destination;

drop table destination;

create table destination as select
d.*, s.country
from destination_old d left join source s
on d.id=s.id;

It's safe because you have a copy of destination before you altered it. I suspect that update statements with joins weren't included in SQLite because they're powerful but a bit risky.

Using the pattern above you end up with two country fields. You can avoid that by explicitly stating all of the columns you want to retrieve from destination_old and perhaps using coalesce to retrieve the values from destination_old if the country field in source is null. So for example:

create table destination as select
d.field1, d.field2,...,coalesce(s.country,d.country) country
from destination_old d left join source s
on d.id=s.id;

php implode (101) with quotes

Another possible option, depending on what you need the array for:

$array = array('lastname', 'email', 'phone');
echo json_encode($array);

This will put '[' and ']' around the string, which you may or may not want.

Conditional Formatting using Excel VBA code

This will get you to an answer for your simple case, but can you expand on how you'll know which columns will need to be compared (B and C in this case) and what the initial range (A1:D5 in this case) will be? Then I can try to provide a more complete answer.

Sub setCondFormat()
    Range("B3").Select
    With Range("B3:H63")
        .FormatConditions.Add Type:=xlExpression, Formula1:= _
          "=IF($D3="""",FALSE,IF($F3>=$E3,TRUE,FALSE))"
        With .FormatConditions(.FormatConditions.Count)
            .SetFirstPriority
            With .Interior
                .PatternColorIndex = xlAutomatic
                .Color = 5287936
                .TintAndShade = 0
            End With
        End With
    End With
End Sub

Note: this is tested in Excel 2010.

Edit: Updated code based on comments.

Efficient evaluation of a function at every cell of a NumPy array

You could just vectorize the function and then apply it directly to a Numpy array each time you need it:

import numpy as np

def f(x):
    return x * x + 3 * x - 2 if x > 0 else x * 5 + 8

f = np.vectorize(f)  # or use a different name if you want to keep the original f

result_array = f(A)  # if A is your Numpy array

It's probably better to specify an explicit output type directly when vectorizing:

f = np.vectorize(f, otypes=[np.float])

How to convert JSON data into a Python object

Python3.x

The best aproach I could reach with my knowledge was this.
Note that this code treat set() too.
This approach is generic just needing the extension of class (in the second example).
Note that I'm just doing it to files, but it's easy to modify the behavior to your taste.

However this is a CoDec.

With a little more work you can construct your class in other ways. I assume a default constructor to instance it, then I update the class dict.

import json
import collections


class JsonClassSerializable(json.JSONEncoder):

    REGISTERED_CLASS = {}

    def register(ctype):
        JsonClassSerializable.REGISTERED_CLASS[ctype.__name__] = ctype

    def default(self, obj):
        if isinstance(obj, collections.Set):
            return dict(_set_object=list(obj))
        if isinstance(obj, JsonClassSerializable):
            jclass = {}
            jclass["name"] = type(obj).__name__
            jclass["dict"] = obj.__dict__
            return dict(_class_object=jclass)
        else:
            return json.JSONEncoder.default(self, obj)

    def json_to_class(self, dct):
        if '_set_object' in dct:
            return set(dct['_set_object'])
        elif '_class_object' in dct:
            cclass = dct['_class_object']
            cclass_name = cclass["name"]
            if cclass_name not in self.REGISTERED_CLASS:
                raise RuntimeError(
                    "Class {} not registered in JSON Parser"
                    .format(cclass["name"])
                )
            instance = self.REGISTERED_CLASS[cclass_name]()
            instance.__dict__ = cclass["dict"]
            return instance
        return dct

    def encode_(self, file):
        with open(file, 'w') as outfile:
            json.dump(
                self.__dict__, outfile,
                cls=JsonClassSerializable,
                indent=4,
                sort_keys=True
            )

    def decode_(self, file):
        try:
            with open(file, 'r') as infile:
                self.__dict__ = json.load(
                    infile,
                    object_hook=self.json_to_class
                )
        except FileNotFoundError:
            print("Persistence load failed "
                  "'{}' do not exists".format(file)
                  )


class C(JsonClassSerializable):

    def __init__(self):
        self.mill = "s"


JsonClassSerializable.register(C)


class B(JsonClassSerializable):

    def __init__(self):
        self.a = 1230
        self.c = C()


JsonClassSerializable.register(B)


class A(JsonClassSerializable):

    def __init__(self):
        self.a = 1
        self.b = {1, 2}
        self.c = B()

JsonClassSerializable.register(A)

A().encode_("test")
b = A()
b.decode_("test")
print(b.a)
print(b.b)
print(b.c.a)

Edit

With some more of research I found a way to generalize without the need of the SUPERCLASS register method call, using a metaclass

import json
import collections

REGISTERED_CLASS = {}

class MetaSerializable(type):

    def __call__(cls, *args, **kwargs):
        if cls.__name__ not in REGISTERED_CLASS:
            REGISTERED_CLASS[cls.__name__] = cls
        return super(MetaSerializable, cls).__call__(*args, **kwargs)


class JsonClassSerializable(json.JSONEncoder, metaclass=MetaSerializable):

    def default(self, obj):
        if isinstance(obj, collections.Set):
            return dict(_set_object=list(obj))
        if isinstance(obj, JsonClassSerializable):
            jclass = {}
            jclass["name"] = type(obj).__name__
            jclass["dict"] = obj.__dict__
            return dict(_class_object=jclass)
        else:
            return json.JSONEncoder.default(self, obj)

    def json_to_class(self, dct):
        if '_set_object' in dct:
            return set(dct['_set_object'])
        elif '_class_object' in dct:
            cclass = dct['_class_object']
            cclass_name = cclass["name"]
            if cclass_name not in REGISTERED_CLASS:
                raise RuntimeError(
                    "Class {} not registered in JSON Parser"
                    .format(cclass["name"])
                )
            instance = REGISTERED_CLASS[cclass_name]()
            instance.__dict__ = cclass["dict"]
            return instance
        return dct

    def encode_(self, file):
        with open(file, 'w') as outfile:
            json.dump(
                self.__dict__, outfile,
                cls=JsonClassSerializable,
                indent=4,
                sort_keys=True
            )

    def decode_(self, file):
        try:
            with open(file, 'r') as infile:
                self.__dict__ = json.load(
                    infile,
                    object_hook=self.json_to_class
                )
        except FileNotFoundError:
            print("Persistence load failed "
                  "'{}' do not exists".format(file)
                  )


class C(JsonClassSerializable):

    def __init__(self):
        self.mill = "s"


class B(JsonClassSerializable):

    def __init__(self):
        self.a = 1230
        self.c = C()


class A(JsonClassSerializable):

    def __init__(self):
        self.a = 1
        self.b = {1, 2}
        self.c = B()


A().encode_("test")
b = A()
b.decode_("test")
print(b.a)
# 1
print(b.b)
# {1, 2}
print(b.c.a)
# 1230
print(b.c.c.mill)
# s

How do I find the current machine's full hostname in C (hostname and domain information)?

To get a fully qualified name for a machine, we must first get the local hostname, and then lookup the canonical name.

The easiest way to do this is by first getting the local hostname using uname() or gethostname() and then performing a lookup with gethostbyname() and looking at the h_name member of the struct it returns. If you are using ANSI c, you must use uname() instead of gethostname().

Example:

char hostname[1024];
hostname[1023] = '\0';
gethostname(hostname, 1023);
printf("Hostname: %s\n", hostname);
struct hostent* h;
h = gethostbyname(hostname);
printf("h_name: %s\n", h->h_name);

Unfortunately, gethostbyname() is deprecated in the current POSIX specification, as it doesn't play well with IPv6. A more modern version of this code would use getaddrinfo().

Example:

struct addrinfo hints, *info, *p;
int gai_result;

char hostname[1024];
hostname[1023] = '\0';
gethostname(hostname, 1023);

memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC; /*either IPV4 or IPV6*/
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;

if ((gai_result = getaddrinfo(hostname, "http", &hints, &info)) != 0) {
    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai_result));
    exit(1);
}

for(p = info; p != NULL; p = p->ai_next) {
    printf("hostname: %s\n", p->ai_canonname);
}

freeaddrinfo(info);

Of course, this will only work if the machine has a FQDN to give - if not, the result of the getaddrinfo() ends up being the same as the unqualified hostname.

jQuery Multiple ID selectors

it should. Typically that's how you do multiple selectors. Otherwise it may not like you trying to assign the return values of three uploads to the same var.

I would suggest using .each or maybe push the returns to an array rather than assigning them to that value.

SELECT with LIMIT in Codeigniter

Try this...

function nationList($limit=null, $start=null) {
    if ($this->session->userdata('language') == "it") {
        $this->db->select('nation.id, nation.name_it as name');
    }

    if ($this->session->userdata('language') == "en") {
        $this->db->select('nation.id, nation.name_en as name');
    }

    $this->db->from('nation');
    $this->db->order_by("name", "asc");

    if ($limit != '' && $start != '') {
       $this->db->limit($limit, $start);
    }
    $query  = $this->db->get();

    $nation = array();
    foreach ($query->result() as $row) {
        array_push($nation, $row);
    }

    return $nation;     
}

.bashrc at ssh login

.bashrc is not sourced when you log in using SSH. You need to source it in your .bash_profile like this:

if [ -f ~/.bashrc ]; then
  . ~/.bashrc
fi

how to check if object already exists in a list

If it's maintainable to use those 2 properties, you could:

bool alreadyExists = myList.Any(x=> x.Foo=="ooo" && x.Bar == "bat");

Printing pointers in C

change line:

char s[] = "asd";

to:

char *s = "asd";

and things will get more clear

How to have multiple colors in a Windows batch file?

Actually this can be done without creating a temporary file. The method described by jeb and dbenham will work even with a target file that contains no backspaces. The critical point is that the line recognized by findstr.exe must not end with a CRLF. So the obvious text file to scan with a line not ending with a CRLF is the invoking batch itself, provided that we end it with such a line! Here's an updated example script working this way...

Changes from the previous example:

  • Uses a single dash on the last line as the searchable string. (Must be short and not appear anywhere else like this in the batch.)
  • Renamed routines and variables to be a little more object-oriented :-)
  • Removed one call level, to slightly improve performance.
  • Added comments (Beginning with :# to look more like most other scripting languages.)

@echo off
setlocal

call :Echo.Color.Init

goto main

:Echo.Color %1=Color %2=Str [%3=/n]
setlocal enableDelayedExpansion
set "str=%~2"
:Echo.Color.2
:# Replace path separators in the string, so that the final path still refers to the current path.
set "str=a%ECHO.DEL%!str:\=a%ECHO.DEL%\..\%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%!"
set "str=!str:/=a%ECHO.DEL%/..\%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%!"
set "str=!str:"=\"!"
:# Go to the script directory and search for the trailing -
pushd "%ECHO.DIR%"
findstr /p /r /a:%~1 "^^-" "!str!\..\!ECHO.FILE!" nul
popd
:# Remove the name of this script from the output. (Dependant on its length.)
for /l %%n in (1,1,12) do if not "!ECHO.FILE:~%%n!"=="" <nul set /p "=%ECHO.DEL%"
:# Remove the other unwanted characters "\..\: -"
<nul set /p "=%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%%ECHO.DEL%"
:# Append the optional CRLF
if not "%~3"=="" echo.
endlocal & goto :eof

:Echo.Color.Var %1=Color %2=StrVar [%3=/n]
if not defined %~2 goto :eof
setlocal enableDelayedExpansion
set "str=!%~2!"
goto :Echo.Color.2

:Echo.Color.Init
set "ECHO.COLOR=call :Echo.Color"
set "ECHO.DIR=%~dp0"
set "ECHO.FILE=%~nx0"
set "ECHO.FULL=%ECHO.DIR%%ECHO.FILE%"
:# Use prompt to store a backspace into a variable. (Actually backspace+space+backspace)
for /F "tokens=1 delims=#" %%a in ('"prompt #$H# & echo on & for %%b in (1) do rem"') do set "ECHO.DEL=%%a"
goto :eof

:main
call :Echo.Color 0a "a"
call :Echo.Color 0b "b"
set "txt=^" & call :Echo.Color.Var 0c txt
call :Echo.Color 0d "<"
call :Echo.Color 0e ">"
call :Echo.Color 0f "&"
call :Echo.Color 1a "|"
call :Echo.Color 1b " "
call :Echo.Color 1c "%%%%"
call :Echo.Color 1d ^"""
call :Echo.Color 1e "*"
call :Echo.Color 1f "?"
:# call :Echo.Color 2a "!"
call :Echo.Color 2b "."
call :Echo.Color 2c ".."
call :Echo.Color 2d "/"
call :Echo.Color 2e "\"
call :Echo.Color 2f "q:" /n
echo(
set complex="c:\hello world!/.\..\\a//^<%%>&|!" /^^^<%%^>^&^|!\
call :Echo.Color.Var 74 complex /n

exit /b

:# The following line must be last and not end by a CRLF.
-

PS. I'm having a problem with the output of the ! character that you did not have in the previous example. (Or at least you did not have the same symptoms.) To be investigated.

How to recover the deleted files using "rm -R" command in linux server?

since answers are disappointing I would like suggest a way in which I got deleted stuff back.

I use an ide to code and accidently I used rm -rf from terminal to remove complete folder. Thanks to ide I recoved it back by reverting the change from ide's local history.

(my ide is intelliJ but all ide's support history backup)