Use C# HttpWebRequest to send json to web service

First of all you missed ScriptService attribute to add in webservice.

[ScriptService]

After then try following method to call webservice via JSON.

        var webAddr = "http://Domain/VBRService.asmx/callJson";
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";            

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = "{\"x\":\"true\"}";

            streamWriter.Write(json);
            streamWriter.Flush();
        }

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            return result;
        }

Python readlines() usage and efficient practice for reading

Read line by line, not the whole file:

for line in open(file_name, 'rb'):
    # process line here

Even better use with for automatically closing the file:

with open(file_name, 'rb') as f:
    for line in f:
        # process line here

The above will read the file object using an iterator, one line at a time.

Xcode Product -> Archive disabled

In addition to the generic device (or "Any iOS Device" in newer versions of Xcode) mentioned in the other answers, it is possible that the "Archive" action is not selected for the current target in the scheme.

To view and edit at the current scheme, select Product > Schemes > Edit Scheme... (Cmd+<), then make sure that the "Archive" action is checked in the line corresponding to the desired target.

In the image below, Archive is not checked and the Archive action is greyed out in the Product menu. Checking the indicated checkbox fixed the issue for me.

how to set radio button checked in edit mode in MVC razor view

You have written like

@Html.RadioButtonFor(model => model.gender, "Male", new { @checked = true }) and
@Html.RadioButtonFor(model => model.gender, "Female", new { @checked = true })

Here you have taken gender as a Enum type and you have written the value for the radio button as a string type- change "Male" to 0 and "Female" to 1.

How to specify more spaces for the delimiter using cut?

One way around this is to go:

$ps axu | grep jboss | sed 's/\s\+/ /g' | cut -d' ' -f3

to replace multiple consecutive spaces with a single one.

Configuration Error: <compilation debug="true" targetFramework="4.0"> ASP.NET MVC3

How are you running the application? Are you just hitting the website or are you building and running from within Visual Studio? If you are building and running you may want to tell it to use the local IIS web server. This would make sure it is using the App Pool you have set up to run with v4.0/integrated.

I am guessing that it is using the Visual Studio Development Server when running. This server is probably trying to run with the 2.0 framework. This then causes your error to be thrown.

Edit: To note, I normally just build my website application and then I attach to process w3wp when I want to debug. I do not use the publishing tool. Of course this means my local working directory is within the web root.

How to upload images into MySQL database using PHP code

This is the perfect code for uploading and displaying image through MySQL database.

<html>
<body>
<form method="post" enctype="multipart/form-data">
<input type="file" name="image"/>
<input type="submit" name="submit" value="Upload"/>
</form>
<?php
    if(isset($_POST['submit']))
    {
     if(getimagesize($_FILES['image']['tmp_name'])==FALSE)
     {
        echo " error ";
     }
     else
     {
        $image = $_FILES['image']['tmp_name'];
        $image = addslashes(file_get_contents($image));
        saveimage($image);
     }
    }
    function saveimage($image)
    {
        $dbcon=mysqli_connect('localhost','root','','dbname');
        $qry="insert into tablename (name) values ('$image')";
        $result=mysqli_query($dbcon,$qry);
        if($result)
        {
            echo " <br/>Image uploaded.";
            header('location:urlofpage.php');
        }
        else
        {
            echo " error ";
        }
    }
?>
</body>
</html>

How can I programmatically freeze the top row of an Excel worksheet in Excel 2007 VBA?

Rows("2:2").Select
ActiveWindow.FreezePanes = True

Select a different range for a different effect, much the same way you would do manually. The "Freeze Top Row" really just is a shortcut new in Excel 2007 (and up), it contains no added functionality compared to earlier versions of Excel.

Split function in oracle to comma separated values with automatic sequence

There are multiple options. See Split single comma delimited string into rows in Oracle

You just need to add LEVEL in the select list as a column, to get the sequence number to each row returned. Or, ROWNUM would also suffice.

Using any of the below SQLs, you could include them into a FUNCTION.

INSTR in CONNECT BY clause:

SQL> WITH DATA AS
  2    ( SELECT 'word1, word2, word3, word4, word5, word6' str FROM dual
  3    )
  4  SELECT trim(regexp_substr(str, '[^,]+', 1, LEVEL)) str
  5  FROM DATA
  6  CONNECT BY instr(str, ',', 1, LEVEL - 1) > 0
  7  /

STR
----------------------------------------
word1
word2
word3
word4
word5
word6

6 rows selected.

SQL>

REGEXP_SUBSTR in CONNECT BY clause:

SQL> WITH DATA AS
  2    ( SELECT 'word1, word2, word3, word4, word5, word6' str FROM dual
  3    )
  4  SELECT trim(regexp_substr(str, '[^,]+', 1, LEVEL)) str
  5  FROM DATA
  6  CONNECT BY regexp_substr(str , '[^,]+', 1, LEVEL) IS NOT NULL
  7  /

STR
----------------------------------------
word1
word2
word3
word4
word5
word6

6 rows selected.

SQL>

REGEXP_COUNT in CONNECT BY clause:

SQL> WITH DATA AS
  2        ( SELECT 'word1, word2, word3, word4, word5, word6' str FROM dual
  3        )
  4      SELECT trim(regexp_substr(str, '[^,]+', 1, LEVEL)) str
  5      FROM DATA
  6      CONNECT BY LEVEL

Using XMLTABLE

SQL> WITH DATA AS
  2    ( SELECT 'word1, word2, word3, word4, word5, word6' str FROM dual
  3    )
  4  SELECT trim(COLUMN_VALUE) str
  5    FROM DATA, xmltable(('"' || REPLACE(str, ',', '","') || '"'))
  6  /
STR
------------------------------------------------------------------------
word1
word2
word3
word4
word5
word6

6 rows selected.

SQL>

Using MODEL clause:

SQL> WITH t AS
  2  (
  3         SELECT 'word1, word2, word3, word4, word5, word6' str
  4         FROM   dual ) ,
  5  model_param AS
  6  (
  7         SELECT str AS orig_str ,
  8                ','
  9                       || str
 10                       || ','                                 AS mod_str ,
 11                1                                             AS start_pos ,
 12                Length(str)                                   AS end_pos ,
 13                (Length(str) - Length(Replace(str, ','))) + 1 AS element_count ,
 14                0                                             AS element_no ,
 15                ROWNUM                                        AS rn
 16         FROM   t )
 17  SELECT   trim(Substr(mod_str, start_pos, end_pos-start_pos)) str
 18  FROM     (
 19                  SELECT *
 20                  FROM   model_param MODEL PARTITION BY (rn, orig_str, mod_str)
 21                  DIMENSION BY (element_no)
 22                  MEASURES (start_pos, end_pos, element_count)
 23                  RULES ITERATE (2000)
 24                  UNTIL (ITERATION_NUMBER+1 = element_count[0])
 25                  ( start_pos[ITERATION_NUMBER+1] = instr(cv(mod_str), ',', 1, cv(element_no)) + 1,
 26                  end_pos[iteration_number+1] = instr(cv(mod_str), ',', 1, cv(element_no) + 1) ) )
 27  WHERE    element_no != 0
 28  ORDER BY mod_str ,
 29           element_no
 30  /

STR
------------------------------------------
word1
word2
word3
word4
word5
word6

6 rows selected.

SQL>

You could also use DBMS_UTILITY package provided by Oracle. It provides various utility subprograms. One such useful utility is COMMA_TO_TABLE procedure, which converts a comma-delimited list of names into a PL/SQL table of names.

Read DBMS_UTILITY.COMMA_TO_TABLE

Groovy - Convert object to JSON string

You can use JsonBuilder for that.

Example Code:

import groovy.json.JsonBuilder

class Person {
    String name
    String address
}

def o = new Person( name: 'John Doe', address: 'Texas' )

println new JsonBuilder( o ).toPrettyString()

What is the best way to filter a Java Collection?

Since the early release of Java 8, you could try something like:

Collection<T> collection = ...;
Stream<T> stream = collection.stream().filter(...);

For example, if you had a list of integers and you wanted to filter the numbers that are > 10 and then print out those numbers to the console, you could do something like:

List<Integer> numbers = Arrays.asList(12, 74, 5, 8, 16);
numbers.stream().filter(n -> n > 10).forEach(System.out::println);

Can't get ScriptManager.RegisterStartupScript in WebControl nested in UpdatePanel to work

ScriptManager.RegisterStartupScript(this, this.GetType(), Guid.NewGuid().ToString(),script,  true );

The "true" param value at the end of the ScriptManager.RegisterStartupScript will add a JavaScript tag inside your page:

<script language='javascript' defer='defer'>your script</script >

If the value will be "false" it will inject only the script witout the --script-- tag.

How to center an unordered list?

Let's say the list is:

<ul>
 <li>item1</li>
 <li>item2</li>
 <li>item3</li>
</ul>

For this example. If I understand correctly, you want the list items to be in the middle of the screen, but you want the text IN those list items to be centered to the left of the list item itself. Doing that is actually pretty easy. You just need some CSS:

ul {
    display: table; 
    margin: 0 auto;
    text-align: left;
}

And it works! Here is what is happening. First, we say we want to affect only unordered lists. Then, we do Rafael Herscovici's trick for centering the list items. Finally, we say to align the text to the left of the list items.

how to add lines to existing file using python

Use 'a', 'a' means append. Anything written to a file opened with 'a' attribute is written at the end of the file.

with open('file.txt', 'a') as file:
    file.write('input')

How can I search (case-insensitive) in a column using LIKE wildcard?

SELECT  *
FROM    trees
WHERE   trees.`title` COLLATE UTF8_GENERAL_CI LIKE '%elm%'

Actually, if you add COLLATE UTF8_GENERAL_CI to your column's definition, you can just omit all these tricks: it will work automatically.

ALTER TABLE trees 
 MODIFY COLUMN title VARCHAR(…) CHARACTER 
 SET UTF8 COLLATE UTF8_GENERAL_CI.

This will also rebuild any indexes on this column so that they could be used for the queries without leading '%'

How exactly does the android:onClick XML attribute differ from setOnClickListener?

When I saw the top answer, it made me realize that my problem was not putting the parameter (View v) on the fancy method:

public void myFancyMethod(View v) {}

When trying to access it from the xml, one should use

android:onClick="myFancyMethod"/>

Hope that helps someone.

Reading images in python

With matplotlib you can use (as shown in the matplotlib documentation)

import matplotlib.pyplot as plt
import matplotlib.image as mpimg

img=mpimg.imread('image_name.png')

And plot the image if you want

imgplot = plt.imshow(img)

Java - Reading XML file

Avoid hardcoding try making the code that is dynamic below is the code it will work for any xml I have used SAX Parser you can use dom,xpath it's upto you I am storing all the tags name and values in the map after that it becomes easy to retrieve any values you want I hope this helps
SAMPLE XML:

<parent>
<child >
    <child1> value 1 </child1>
    <child2> value 2 </child2>
    <child3> value 3 </child3>
    </child>
    <child >
     <child4> value 4 </child4>
    <child5> value 5</child5>
    <child6> value 6 </child6>
    </child>
  </parent>

JAVA CODE:

 import java.io.File;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.LinkedHashMap;
    import java.util.Map;
    import javax.xml.parsers.ParserConfigurationException;
    import javax.xml.parsers.SAXParser;
    import javax.xml.parsers.SAXParserFactory;
    import org.xml.sax.Attributes;
    import org.xml.sax.SAXException;
    import org.xml.sax.helpers.DefaultHandler;


    public class saxParser {
           static Map<String,String> tmpAtrb=null;
           static Map<String,String> xmlVal= new LinkedHashMap<String, String>();
        public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, VerifyError {

            /**
             * We can pass the class name of the XML parser
             * to the SAXParserFactory.newInstance().
             */

            //SAXParserFactory saxDoc = SAXParserFactory.newInstance("com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl", null);

            SAXParserFactory saxDoc = SAXParserFactory.newInstance();
            SAXParser saxParser = saxDoc.newSAXParser();

            DefaultHandler handler = new DefaultHandler() {
                String tmpElementName = null;
                String tmpElementValue = null;


                @Override
                public void startElement(String uri, String localName, String qName, 
                                                                    Attributes attributes) throws SAXException {
                    tmpElementValue = "";
                    tmpElementName = qName;
                    tmpAtrb=new HashMap();
                    //System.out.println("Start Element :" + qName);
                    /**
                     * Store attributes in HashMap
                     */
                    for (int i=0; i<attributes.getLength(); i++) {
                        String aname = attributes.getLocalName(i);
                        String value = attributes.getValue(i);
                        tmpAtrb.put(aname, value);
                    }

                }

                @Override
                public void endElement(String uri, String localName, String qName) 
                                                            throws SAXException { 

                    if(tmpElementName.equals(qName)){
                        System.out.println("Element Name :"+tmpElementName);
                    /**
                     * Retrive attributes from HashMap
                     */                    for (Map.Entry<String, String> entrySet : tmpAtrb.entrySet()) {
                            System.out.println("Attribute Name :"+ entrySet.getKey() + "Attribute Value :"+ entrySet.getValue());
                        }
                        System.out.println("Element Value :"+tmpElementValue);
                        xmlVal.put(tmpElementName, tmpElementValue);
                        System.out.println(xmlVal);
                      //Fetching The Values From The Map
                        String getKeyValues=xmlVal.get(tmpElementName);
                        System.out.println("XmlTag:"+tmpElementName+":::::"+"ValueFetchedFromTheMap:"+getKeyValues);   
                    }   
                }
                @Override
                public void characters(char ch[], int start, int length) throws SAXException {
                    tmpElementValue = new String(ch, start, length) ;  
                } 
            };
            /**
             * Below two line used if we use SAX 2.0
             * Then last line not needed.
             */

            //saxParser.setContentHandler(handler);
            //saxParser.parse(new InputSource("c:/file.xml"));
            saxParser.parse(new File("D:/Test _ XML/file.xml"), handler);
        }  
    }

OUTPUT:

Element Name :child1
Element Value : value 1 
XmlTag:<child1>:::::ValueFetchedFromTheMap: value 1 
Element Name :child2
Element Value : value 2 
XmlTag:<child2>:::::ValueFetchedFromTheMap: value 2 
Element Name :child3
Element Value : value 3 
XmlTag:<child3>:::::ValueFetchedFromTheMap: value 3 
Element Name :child4
Element Value : value 4 
XmlTag:<child4>:::::ValueFetchedFromTheMap: value 4 
Element Name :child5
Element Value : value 5
XmlTag:<child5>:::::ValueFetchedFromTheMap: value 5
Element Name :child6
Element Value : value 6 
XmlTag:<child6>:::::ValueFetchedFromTheMap: value 6 
Values Inside The Map:{child1= value 1 , child2= value 2 , child3= value 3 , child4= value 4 , child5= value 5, child6= value 6 }

Using an Alias in a WHERE clause

Just as an alternative approach to you can do:

WITH inner_table AS
(SELECT A.identifier
    , A.name
    , TO_NUMBER(DECODE( A.month_no
      , 1, 200803 
      , 2, 200804 
      , 3, 200805 
      , 4, 200806 
      , 5, 200807 
      , 6, 200808 
      , 7, 200809 
      , 8, 200810 
      , 9, 200811 
      , 10, 200812 
      , 11, 200701 
      , 12, 200702
      , NULL)) as MONTH_NO
    , TO_NUMBER(TO_CHAR(B.last_update_date, 'YYYYMM')) as UPD_DATE
  FROM table_a A
    , table_b B
  WHERE A.identifier = B.identifier)

    SELECT * FROM inner_table 
    WHERE MONTH_NO > UPD_DATE

Also you can create a permanent view for your queue and select from view.

CREATE OR REPLACE VIEW_1 AS (SELECT ...);
SELECT * FROM VIEW_1;

Inserting Data into Hive Table

It's a limitation of hive.

1.You cannot update data after it is inserted

2.There is no "insert into table values ... " statement

3.You can only load data using bulk load

4.There is not "delete from " command

5.You can only do bulk delete

But you still want to insert record from hive console than you can do select from statck. refer this

Send JSON data via POST (ajax) and receive json response from Controller (MVC)

Create a model

public class Person
{
    public string Name { get; set; }
    public string Address { get; set; }
    public string Phone { get; set; }
}

Controllers Like Below

    public ActionResult PersonTest()
    {
        return View();
    }

    [HttpPost]
    public ActionResult PersonSubmit(Vh.Web.Models.Person person)
    {
        System.Threading.Thread.Sleep(2000);  /*simulating slow connection*/

        /*Do something with object person*/


        return Json(new {msg="Successfully added "+person.Name });
    }

Javascript

<script type="text/javascript">
    function send() {
        var person = {
            name: $("#id-name").val(),
            address:$("#id-address").val(),
            phone:$("#id-phone").val()
        }

        $('#target').html('sending..');

        $.ajax({
            url: '/test/PersonSubmit',
            type: 'post',
            dataType: 'json',
            contentType: 'application/json',
            success: function (data) {
                $('#target').html(data.msg);
            },
            data: JSON.stringify(person)
        });
    }
</script>

Table-level backup

I am using the bulk copy utility to achieve table-level backups

to export:

bcp.exe "select * from [MyDatabase].dbo.Customer " queryout "Customer.bcp" -N -S localhost -T -E

to import:

bcp.exe [MyDatabase].dbo.Customer in "Customer.bcp" -N -S localhost -T -E -b 10000

as you can see, you can export based on any query, so you can even do incremental backups with this. Plus, it is scriptable as opposed to the other methods mentioned here that use SSMS.

Move existing, uncommitted work to a new branch in Git

Alternatively:

Save current changes to a temp stash:

$ git stash
Create a new branch based on this stash, and switch to the new branch:

$ git stash branch <new-branch> stash@{0}

Tip: use tab key to reduce typing the stash name.

How to align this span to the right of the div?

If you can modify the HTML: http://jsfiddle.net/8JwhZ/3/

<div class="title">
  <span class="name">Cumulative performance</span>
  <span class="date">20/02/2011</span>
</div>

.title .date { float:right }
.title .name { float:left }

element not interactable exception in selenium web automation

you may also try full xpath, I had a similar issue where I had to click on an element which has a property javascript onclick function. the full xpath method worked and no interactable exception was thrown.

Java and SQLite

When you compile and run the code, you should set the classpath options value. Just like the following:

javac -classpath .;sqlitejdbc-v056.jar Text.java

java -classpath .;sqlitejdbc-v056.jar Text

Please pay attention to "." and the sparate ";"(win, the linux is ":")

How to register multiple servlets in web.xml in one Spring application

As explained in this thread on the cxf-user mailing list, rather than having the CXFServlet load its own spring context from user-webservice-servlet.xml, you can just load the whole lot into the root context. Rename your existing user-webservice-servlet.xml to some other name (e.g. user-webservice-beans.xml) then change your contextConfigLocation parameter to something like:

<servlet>
  <servlet-name>myservlet</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
  <servlet-name>myservlet</servlet-name>
  <url-pattern>*.htm</url-pattern>
</servlet-mapping>

<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>
    /WEB-INF/applicationContext.xml
    /WEB-INF/user-webservice-beans.xml
  </param-value>
</context-param>

<servlet>
  <servlet-name>user-webservice</servlet-name>
  <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>
  <load-on-startup>2</load-on-startup>
</servlet>

<servlet-mapping>
  <servlet-name>user-webservice</servlet-name>
  <url-pattern>/UserService/*</url-pattern>
</servlet-mapping>

Removing carriage return and new-line from the end of a string in c#

I use lots of erasing level

String donen = "lots of stupid whitespaces and new lines and others..."

//Remove multilines
donen = Regex.Replace(donen, @"^\s+$[\r\n]*", "", RegexOptions.Multiline);
//remove multi whitespaces
RegexOptions options = RegexOptions.None;
Regex regex = new Regex("[ ]{2,}", options);
donen = regex.Replace(donen, " ");
//remove tabs
char tab = '\u0009';
donen = donen.Replace(tab.ToString(), "");
//remove endoffile newlines
donen = donen.TrimEnd('\r', '\n');
//to be sure erase new lines again from another perspective
donen.Replace(Environment.NewLine, "");

and now we have a clean one row

Is it possible to install iOS 6 SDK on Xcode 5?

Linking the 6.1 SDK into Xcode 5 as described in the other answers is one step. However this still doesn't solve the problem that running on iOS 7 new UI elements are taken, view controllers are made full-size etc.

As described in this answer it is also required to switch the UI into legacy mode on iOS 7:

[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"UIUseLegacyUI"];
[[NSUserDefaults standardUserDefaults] synchronize];

Beware: This is an undocumented key and not recommended for App Store builds!

Also, in my experience while testing on the device I found that it only works the second time I launch the app even though I'm running the code fairly early in the app launch, in +[AppDelegate initialize]. Also there are subtle differences to a version built using Xcode 4.6. For instance, transparent navigation bars behave differently (causing the view to be full-size).

However, since Xcode 4.6.3 crashes on Mavericks (at least for me, see rdar://15318883), this is at least a solution to continue using Xcode 5 for debugging.

runOnUiThread in fragment

In Xamarin.Android

For Fragment:

this.Activity.RunOnUiThread(() => { yourtextbox.Text="Hello"; });

For Activity:

RunOnUiThread(() => { yourtextbox.Text="Hello"; });

Happy coding :-)

C# - Insert a variable number of spaces into a string? (Formatting an output file)

Use String.Format() or TextWriter.Format() (depending on how you actually write to the file) and specify the width of a field.

String.Format("{0,20}{1,15}{2,15}", "Sample Title One", "Element One", "Whatever Else");

You can specify the width of a field within interpolated strings as well:

$"{"Sample Title One",20}{"Element One",15}{"Whatever Else",15}"

And just so you know, you can create a string of repeated characters using the appropriate string contructor.

new String(' ', 20); // string of 20 spaces

Add a tooltip to a div

A CSS3-only solution could be:

CSS3:

div[id^="tooltip"]:after {content: attr(data-title); background: #e5e5e5; position: absolute; top: -10px; left:  0; right: 0; z-index: 1000;}

HTML5:

<div style="background: yellow;">
    <div id="tooltip-1" data-title="Tooltip Text" style="display: inline-block; position: relative; background: pink;">
        <label>Name</label>
        <input type="text" />
    </div>
</div>

You could then create a tooltip-2 div the same way... you can of course also use the title attribute instead of data attribute.

How to catch an Exception from a thread

AtomicReference is also a solution to pass the error to the main thread .Is same approach like the one of Dan Cruz .

AtomicReference<Throwable> errorReference = new AtomicReference<>();

    Thread thread = new Thread() {
        public void run() {
            throw new RuntimeException("TEST EXCEPTION");

        }
    };
    thread.setUncaughtExceptionHandler((th, ex) -> {
        errorReference.set(ex);
    });
    thread.start();
    thread.join();
    Throwable newThreadError= errorReference.get();
    if (newThreadError!= null) {
        throw newThreadError;
    }

The only change is that instead of creating a volatile variable you can use AtomicReference which did same thing behind the scenes.

100% height minus header?

For "100% of the browser window", if you mean this literally, you should use fixed positioning. The top, bottom, right, and left properties are then used to offset the divs edges from the respective edges of the viewport:

#nav, #content{position:fixed;top:0px;bottom:0px;}
#nav{left:0px;right:235px;}
#content{left:235px;right:0px}

This will set up a screen with the left 235 pixels devoted to the nav, and the right rest of the screen to content.

Note, however, you won't be able to scroll the whole screen at once. Though you can set it to scroll either pane individually, by applying overflow:auto to either div.

Note also: fixed positioning is not supported in IE6 or earlier.

Cannot find either column "dbo" or the user-defined function or aggregate "dbo.Splitfn", or the name is ambiguous

You need to treat a table valued udf like a table, eg JOIN it

select Emp_Id 
from Employee E JOIN dbo.Splitfn(@Id,',') CSV ON E.Emp_Id = CSV.items

Firebase FCM notifications click_action payload

Update:

So just to verify, it is not currently possible to set the click_action parameter via the Firebase Console.

So I've been trying to do this in the Firebase Notifications Console with no luck. Since I can't seem to find anywhere to place the click_action value in the console, what I mainly did to test this out is to add a custom key/value pair in the Notification (Advance Options > Custom Data):

Key: click_action
Value: <your_preferred_value>

then tried calling RemoteMessage.getNotification().getClickAction() in onMessageReceived() to see if it was retrieving the correct value, but it always returns null. So next I tried calling RemoteMessage.getData().get(< specified_key >) and was able to retrieve the value I added.

NOTE: I am not entirely sure if that is okay to be used as a workaround, or if it's against best practice. I would suggest using your own app server but your post is specific to the Firebase Console.

The way the client app and the notification behaves still depends on how you program it. With that said, I think you can use the above as a workaround, using the value retrieved from the getData(), then having the Notification call this or that. Hope this helps somehow. Cheers! :D

How to match, but not capture, part of a regex?

Update: Thanks to Germán Rodríguez Herrera!

In javascript try: /123-(apple(?=-)|banana(?=-)|(?!-))-?456/

Remember that the result is in group 1

Debuggex Demo

Reading a file character by character in C

Either of the two should do the trick -

char *readFile(char *fileName)
{
  FILE *file;
  char *code = malloc(1000 * sizeof(char));
  char *p = code;
  file = fopen(fileName, "r");
  do 
  {
    *p++ = (char)fgetc(file);
  } while(*p != EOF);
  *p = '\0';
  return code;
}

char *readFile(char *fileName)
{
  FILE *file;
  int i = 0;
  char *code = malloc(1000 * sizeof(char));
  file = fopen(fileName, "r");
  do 
  {
    code[i++] = (char)fgetc(file);
  } while(code[i-1] != EOF);
  code[i] = '\0'
  return code;
}

Like the other posters have pointed out, you need to ensure that the file size does not exceed 1000 characters. Also, remember to free the memory when you're done using it.

How can you use php in a javascript function

Simply, your question sounded wrong because the JavaScript variables need to be echoed.

_x000D_

<?php_x000D_
        $num = 1;_x000D_
        echo $num;_x000D_
        echo "<input type='button' value='Click' onclick='readmore()' />";_x000D_
     echo "<script> function readmore() { document.write('";_x000D_
        $num = 2;_x000D_
        echo $num;_x000D_
        echo "'); } </script>";_x000D_
?>

_x000D_

Activate a virtualenv with a Python script

You should create all your virtualenvs in one folder, such as virt.

Assuming your virtualenv folder name is virt, if not change it

cd
mkdir custom

Copy the below lines...

#!/usr/bin/env bash
ENV_PATH="$HOME/virt/$1/bin/activate"
bash --rcfile $ENV_PATH -i

Create a shell script file and paste the above lines...

touch custom/vhelper
nano custom/vhelper

Grant executable permission to your file:

sudo chmod +x custom/vhelper

Now export that custom folder path so that you can find it on the command-line by clicking tab...

export PATH=$PATH:"$HOME/custom"

Now you can use it from anywhere by just typing the below command...

vhelper YOUR_VIRTUAL_ENV_FOLDER_NAME

Suppose it is abc then...

vhelper abc

Add image to left of text via css

This works great

.create:before{
    content: "";
    display: block;
    background: url('somewhere.jpg') no-repeat;
    width: 25px;
    height: 25px;
    float: left;
}

Remove CSS "top" and "left" attributes with jQuery

Shell script to set environment variables

Please show us more parts of the script and tell us what commands you had to individually execute and want to simply.

Meanwhile you have to use double quotes not single quote to expand variables:

export PATH="/home/linux/Practise/linux-devkit/bin/:$PATH"

Semicolons at the end of a single command are also unnecessary.

So far:

#!/bin/sh
echo "Perform Operation in su mode"
export ARCH=arm
echo "Export ARCH=arm Executed"
export PATH="/home/linux/Practise/linux-devkit/bin/:$PATH"
echo "Export path done"
export CROSS_COMPILE='/home/linux/Practise/linux-devkit/bin/arm-arago-linux-gnueabi-' ## What's next to -?
echo "Export CROSS_COMPILE done"
# continue your compilation commands here
...

For su you can run it with:

su -c 'sh /path/to/script.sh'

Note: The OP was not explicitly asking for steps on how to create export variables in an interactive shell using a shell script. He only asked his script to be assessed at most. He didn't mention details on how his script would be used. It could have been by using . or source from the interactive shell. It could have been a standalone scipt, or it could have been source'd from another script. Environment variables are not specific to interactive shells. This answer solved his problem.

Dynamic classname inside ngClass in angular 2

i want to mention some important point to bare in mind while implementing class binding.

    [ngClass] = "{
    'badge-secondary': somevariable  === value1,
    'badge-danger': somevariable  === value1,
    'badge-warning': somevariable  === value1,
    'badge-warning': somevariable  === value1,
    'badge-success': somevariable  === value1 }"

class here is not binding correctly because one condition is to be met, whereas you have two identical classes 'badge-warning' that may have two different condition. To correct this

 [ngClass] = "{
    'badge-secondary': somevariable === value1,
    'badge-danger': somevariable  === value1,
    'badge-warning': somevariable  === value1 || somevariable  === value1, 
    'badge-success': somevariable  === value1 }"

Difference between fprintf, printf and sprintf?

You can also do very useful things with vsnprintf() function:

$ cat test.cc
#include <exception>
#include <stdarg.h>
#include <stdio.h>

struct exception_fmt : std::exception
{
    exception_fmt(char const* fmt, ...) __attribute__ ((format(printf,2,3)));
    char const* what() const throw() { return msg_; }
    char msg_[0x800];
};

exception_fmt::exception_fmt(char const* fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    vsnprintf(msg_, sizeof msg_, fmt, ap);
    va_end(ap);
}

int main(int ac, char** av)
{
    throw exception_fmt("%s: bad number of arguments %d", *av, ac);
}

$ g++ -Wall -o test test.cc

$ ./test
terminate called after throwing an instance of 'exception_fmt'
  what():  ./test: bad number of arguments 1
Aborted (core dumped)

Swift Modal View Controller with transparent background

You can do it like this:

In your main view controller:

func showModal() {
    let modalViewController = ModalViewController()
    modalViewController.modalPresentationStyle = .overCurrentContext
    presentViewController(modalViewController, animated: true, completion: nil)
}

In your modal view controller:

class ModalViewController: UIViewController {
    override func viewDidLoad() {
        view.backgroundColor = UIColor.clearColor()
        view.opaque = false
    }
}

If you are working with a storyboard:

Just add a Storyboard Segue with Kind set to Present Modally to your modal view controller and on this view controller set the following values:

Background = Clear Color
Drawing = Uncheck the Opaque checkbox
Presentation = Over Current Context

As Crashalot pointed out in his comment: Make sure the segue only uses Default for both Presentation and Transition. Using Current Context for Presentation makes the modal turn black instead of remaining transparent.

Jquery Chosen plugin - dynamically populate list by Ajax

You can dynamically populate a list via AJAX using the excellent Select2 plugin. From my answer to "Is there a way to dynamically ajax add elements through jquery chosen plugin?":

Take a look at the neat Select2 plugin, which is based on Chosen itself and supports remote data sources (aka AJAX data) and infinite scrolling.

Inline elements shifting when made bold on hover

I've combined a bunch of the techniques above to provide something that doesn't totally suck with js turned off and is even better with a bit of jQuery. Now that browsers support for subpixel letter-spacing is improving, it's really nice to use it.

_x000D_

jQuery(document).ready(function($) {_x000D_
  $('.nav a').each(function(){_x000D_
      $(this).clone().addClass('hoverclone').fadeTo(0,0).insertAfter($(this));_x000D_
    var regular = $(this);_x000D_
    var hoverclone = $(this).next('.hoverclone');_x000D_
    regular.parent().not('.current_page_item').hover(function(){_x000D_
      regular.filter(':not(:animated)').fadeTo(200,0);_x000D_
      hoverclone.fadeTo(150,1);_x000D_
    }, function(){_x000D_
      regular.fadeTo(150,1);_x000D_
      hoverclone.filter(':not(:animated)').fadeTo(250,0);_x000D_
    });_x000D_
  });_x000D_
});

_x000D_

ul {_x000D_
  font:normal 20px Arial;_x000D_
  text-align: center;_x000D_
}_x000D_
li, a {_x000D_
  display:inline-block;_x000D_
  text-align:center;_x000D_
}_x000D_
a {_x000D_
  padding:4px 8px;_x000D_
  text-decoration:none;_x000D_
  color: #555;_x000D_
}_x000D_
_x000D_
.nav a {_x000D_
  letter-spacing: 0.53px; /* adjust this value per font */_x000D_
}_x000D_
.nav .current_page_item a,_x000D_
.nav a:hover {_x000D_
  font-weight: bold;_x000D_
  letter-spacing: 0px;_x000D_
}_x000D_
.nav li {_x000D_
  position: relative;_x000D_
}_x000D_
.nav a.hoverclone {_x000D_
  position: absolute;_x000D_
  top:0;_x000D_
  left: 0;_x000D_
  white-space: nowrap;_x000D_
}

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>_x000D_
<ul class="nav">_x000D_
  <li><a href="#">Item 1</a></li>_x000D_
  <li><a href="#">Item 2</a></li>_x000D_
  <li class="current_page_item"><a  href="#">Item 3</a></li>_x000D_
  <li><a href="#">Item 4</a></li>_x000D_
  <li><a href="#">Item 5</a></li>_x000D_
</ul>

_x000D_

How to format DateTime to 24 hours time?

Use upper-case HH for 24h format:

String s = curr.ToString("HH:mm");

See DateTime.ToString Method.

Pass variable to function in jquery AJAX success callback

You can also use indexValue attribute for passing multiple parameters via object:

var someData = "hello";

jQuery.ajax({
    url: "http://maps.google.com/maps/api/js?v=3",
    indexValue: {param1:someData, param2:"Other data 2", param3: "Other data 3"},
    dataType: "script"
}).done(function() {
    console.log(this.indexValue.param1);
    console.log(this.indexValue.param2);
    console.log(this.indexValue.param3);
});

VBA: Conditional - Is Nothing

In my sample code, I was setting my object to nothing, and I couldn't get the "not" part of the if statement to work with the object. I tried if My_Object is not nothing and also if not My_Object is nothing. It may be just a syntax thing I can't figure out but I didn't have time to mess around, so I did a little workaround like this:

if My_Object is Nothing Then
    'do nothing
Else
    'Do something
End if

Fill background color left to right CSS

A single css code on hover can do the trick: box-shadow: inset 100px 0 0 0 #e0e0e0;

A complete demo can be found in my fiddle:

https://jsfiddle.net/shuvamallick/3o0h5oka/

jquery how to use multiple ajax calls one after the end of the other

You are somewhat close, but you should put your function inside the document.ready event handler instead of the other-way-around.

Another way to do this is by placing your AJAX call in a generic function and call that function from an AJAX callback to loop through a set of requests in order:

$(function () {

    //setup an array of AJAX options,
    //each object will specify information for a single AJAX request
    var ajaxes  = [
            {
                url      : '<url>',
                data     : {...},
                callback : function (data) { /*do work on data*/ }
            },
            {
                url      : '<url2>',
                data     : {...},
                callback : function (data) { /*maybe something different (maybe not)*/ }
            }
        ],
        current = 0;

    //declare your function to run AJAX requests
    function do_ajax() {

        //check to make sure there are more requests to make
        if (current < ajaxes.length) {

            //make the AJAX request with the given info from the array of objects
            $.ajax({
                url      : ajaxes[current].url,
                data     : ajaxes[current].data,
                success  : function (serverResponse) {

                    //once a successful response has been received,
                    //no HTTP error or timeout reached,
                    //run the callback for this request
                    ajaxes[current].callback(serverResponse);

                },
                complete : function () {

                    //increment the `current` counter
                    //and recursively call our do_ajax() function again.
                    current++;
                    do_ajax();

                    //note that the "success" callback will fire
                    //before the "complete" callback

                }
            });
        }
    }

    //run the AJAX function for the first time once `document.ready` fires
    do_ajax();

});

In this example, the recursive call to run the next AJAX request is being set as the complete callback so that it runs regardless of the status of the current response. Meaning that if the request times out or returns an HTTP error (or invalid response), the next request will still run. If you require subsequent requests to only run when a request is successful, then using the success callback to make your recursive call would likely be best.

Updated 2018-08-21 in regards to good points in comments.

What is the runtime performance cost of a Docker container?

Docker isn't virtualization, as such -- instead, it's an abstraction on top of the kernel's support for different process namespaces, device namespaces, etc.; one namespace isn't inherently more expensive or inefficient than another, so what actually makes Docker have a performance impact is a matter of what's actually in those namespaces.

Docker's choices in terms of how it configures namespaces for its containers have costs, but those costs are all directly associated with benefits -- you can give them up, but in doing so you also give up the associated benefit:

Layered filesystems are expensive -- exactly what the costs are vary with each one (and Docker supports multiple backends), and with your usage patterns (merging multiple large directories, or merging a very deep set of filesystems will be particularly expensive), but they're not free. On the other hand, a great deal of Docker's functionality -- being able to build guests off other guests in a copy-on-write manner, and getting the storage advantages implicit in same -- ride on paying this cost.
DNAT gets expensive at scale -- but gives you the benefit of being able to configure your guest's networking independently of your host's and have a convenient interface for forwarding only the ports you want between them. You can replace this with a bridge to a physical interface, but again, lose the benefit.
Being able to run each software stack with its dependencies installed in the most convenient manner -- independent of the host's distro, libc, and other library versions -- is a great benefit, but needing to load shared libraries more than once (when their versions differ) has the cost you'd expect.

And so forth. How much these costs actually impact you in your environment -- with your network access patterns, your memory constraints, etc -- is an item for which it's difficult to provide a generic answer.

REST API Login Pattern

A big part of the REST philosophy is to exploit as many standard features of the HTTP protocol as possible when designing your API. Applying that philosophy to authentication, client and server would utilize standard HTTP authentication features in the API.

Login screens are great for human user use cases: visit a login screen, provide user/password, set a cookie, client provides that cookie in all future requests. Humans using web browsers can't be expected to provide a user id and password with each individual HTTP request.

But for a REST API, a login screen and session cookies are not strictly necessary, since each request can include credentials without impacting a human user; and if the client does not cooperate at any time, a 401 "unauthorized" response can be given. RFC 2617 describes authentication support in HTTP.

TLS (HTTPS) would also be an option, and would allow authentication of the client to the server (and vice versa) in every request by verifying the public key of the other party. Additionally this secures the channel for a bonus. Of course, a keypair exchange prior to communication is necessary to do this. (Note, this is specifically about identifying/authenticating the user with TLS. Securing the channel by using TLS / Diffie-Hellman is always a good idea, even if you don't identify the user by its public key.)

An example: suppose that an OAuth token is your complete login credentials. Once the client has the OAuth token, it could be provided as the user id in standard HTTP authentication with each request. The server could verify the token on first use and cache the result of the check with a time-to-live that gets renewed with each request. Any request requiring authentication returns 401 if not provided.

How do I create a new column from the output of pandas groupby().sum()?

How do I create a new column with Groupby().Sum()?

There are two ways - one straightforward and the other slightly more interesting.

Everybody's Favorite: `GroupBy.transform()` with `'sum'`

@Ed Chum's answer can be simplified, a bit. Call DataFrame.groupby rather than Series.groupby. This results in simpler syntax.

# The setup.
df[['Date', 'Data3']]

         Date  Data3
0  2015-05-08      5
1  2015-05-07      8
2  2015-05-06      6
3  2015-05-05      1
4  2015-05-08     50
5  2015-05-07    100
6  2015-05-06     60
7  2015-05-05    120

df.groupby('Date')['Data3'].transform('sum')

0     55
1    108
2     66
3    121
4     55
5    108
6     66
7    121
Name: Data3, dtype: int64

It's a tad faster,

df2 = pd.concat([df] * 12345)

%timeit df2['Data3'].groupby(df['Date']).transform('sum')
%timeit df2.groupby('Date')['Data3'].transform('sum')

10.4 ms ± 367 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
8.58 ms ± 559 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

Unconventional, but Worth your Consideration: `GroupBy.sum()` + `Series.map()`

I stumbled upon an interesting idiosyncrasy in the API. From what I tell, you can reproduce this on any major version over 0.20 (I tested this on 0.23 and 0.24). It seems like you consistently can shave off a few milliseconds of the time taken by transform if you instead use a direct function of GroupBy and broadcast it using map:

df.Date.map(df.groupby('Date')['Data3'].sum())

0     55
1    108
2     66
3    121
4     55
5    108
6     66
7    121
Name: Date, dtype: int64

Compare with

df.groupby('Date')['Data3'].transform('sum')

0     55
1    108
2     66
3    121
4     55
5    108
6     66
7    121
Name: Data3, dtype: int64

My tests show that map is a bit faster if you can afford to use the direct GroupBy function (such as mean, min, max, first, etc). It is more or less faster for most general situations upto around ~200 thousand records. After that, the performance really depends on the data.

(Left: v0.23, Right: v0.24)

Nice alternative to know, and better if you have smaller frames with smaller numbers of groups. . . but I would recommend transform as a first choice. Thought this was worth sharing anyway.

Benchmarking code, for reference:

import perfplot

perfplot.show(
    setup=lambda n: pd.DataFrame({'A': np.random.choice(n//10, n), 'B': np.ones(n)}),
    kernels=[
        lambda df: df.groupby('A')['B'].transform('sum'),
        lambda df:  df.A.map(df.groupby('A')['B'].sum()),
    ],
    labels=['GroupBy.transform', 'GroupBy.sum + map'],
    n_range=[2**k for k in range(5, 20)],
    xlabel='N',
    logy=True,
    logx=True
)

How to Change Margin of TextView

This one is tricky problem, i set margin to textview in a row of a table layout. see the below:

TableLayout tl = new TableLayout(this);
tl.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

TableRow tr = new TableRow(this);        
tr.setBackgroundResource(R.color.rowColor);

LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.setMargins(4, 4, 4, 4);

TextView tv = new TextView(this);
tv.setBackgroundResource(R.color.textviewColor);
tv.setText("hello");
tr.addView(tv, params);

TextView tv2 = new TextView(this);
tv2.setBackgroundResource(R.color.textviewColor);
tv2.setText("hi");
tr.addView(tv2, params);

tl.addView(tr);
setContentView(tl);

the class needed to import for LayoutParams for use in a table row is :

import android.widget.**TableRow**.LayoutParams;

important to note that i added the class for table row. similarly many other classes are available to use LayoutParams like:

import android.widget.**RelativeLayout**.LayoutParams;

import android.widget.LinearLayout.LayoutParams;

so use accordingly.

ImportError: No module named xlsxwriter

Here are some easy way to get you up and running with the XlsxWriter module.The first step is to install the XlsxWriter module.The pip installer is the preferred method for installing Python modules from PyPI, the Python Package Index:

sudo pip install xlsxwriter

Note

Windows users can omit sudo at the start of the command.

Access denied for user 'root'@'localhost' with PHPMyAdmin

Edit your phpmyadmin config.inc.php file and if you have Password, insert that in front of Password in following code:

$cfg['Servers'][$i]['verbose'] = 'localhost';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '3306';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = '**your-root-username**';
$cfg['Servers'][$i]['password'] = '**root-password**';
$cfg['Servers'][$i]['AllowNoPassword'] = true;

How to send a header using a HTTP request through a curl call?

In PHP:

curl_setopt($ch, CURLOPT_HTTPHEADER, array('HeaderName:HeaderValue'));

or you can set multiple:

curl_setopt($ch, CURLOPT_HTTPHEADER, array('HeaderName:HeaderValue', 'HeaderName2:HeaderValue2'));

How to dynamically change header based on AngularJS partial view?

While others may have better methods, I was able to use $rootScope in my controllers, as each of my views/templates has a distinct controller. You will need to inject the $rootScope in each controller. While this may not be ideal, it is functioning for me, so I thought I should pass it along. If you inspect the page, it adds the ng-binding to the title tag.

Example Controller:

myapp.controller('loginPage', ['$scope', '$rootScope', function ($scope, $rootScope) {

// Dynamic Page Title and Description
$rootScope.pageTitle = 'Login to Vote';
$rootScope.pageDescription = 'This page requires you to login';
}]);

Example Index.html header:

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<meta name="description" content="{{pageDescription}}">
<meta name="author" content="">
<link rel="shortcut icon" href="../../assets/ico/favicon.ico">
<base href="/">
<title>{{pageTitle}}</title>

You can also set the pageTitle and pageDescription to dynamic values, such as returning data from a REST call:

    $scope.article = restCallSingleArticle.get({ articleID: $routeParams.articleID }, function() {
    // Dynamic Page Title and Description
    $rootScope.pageTitle = $scope.article.articletitle;
    $rootScope.pageDescription = $scope.article.articledescription;
});

Again, others may have better ideas on how to approach this, but since I am using a pre-rendering, my needs are being met.

How to put space character into a string name in XML?

to use white space in xml as string use  . XML won't take white space as it is. it will trim the white space before setting it. So use   instead of single white space

How to set a Header field on POST a form?

From FormData documention:

XMLHttpRequest Level 2 adds support for the new FormData interface. FormData objects provide a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the XMLHttpRequest send() method.

With an XMLHttpRequest you can set the custom headers and then do the POST.

select dept names who have more than 2 employees whose salary is greater than 1000

select min(DEPARTMENT.DeptName) as deptname 
from DEPARTMENT
inner join employee on
DEPARTMENT.DeptId = employee.DeptId
where Salary > 1000
group by (EmpId) having count(EmpId) > =2

MySQL select where column is not empty

you can use like operator wildcard to achieve this:

SELECT t.phone, 
       t.phone2 
FROM jewishyellow.users t
WHERE t.phone LIKE '813%' 
  AND t.phone2 like '[0-9]';

in this way, you could get all phone2 that have a number prefix.

Check existence of directory and create if doesn't exist

I had an issue with R 2.15.3 whereby while trying to create a tree structure recursively on a shared network drive I would get a permission error.

To get around this oddity I manually create the structure;

mkdirs <- function(fp) {
    if(!file.exists(fp)) {
        mkdirs(dirname(fp))
        dir.create(fp)
    }
} 

mkdirs("H:/foo/bar")

Caching a jquery ajax response in javascript/browser

        function getDatas() {
            let cacheKey = 'memories';

            if (cacheKey in localStorage) {
                let datas = JSON.parse(localStorage.getItem(cacheKey));

                // if expired
                if (datas['expires'] < Date.now()) {
                    localStorage.removeItem(cacheKey);

                    getDatas()
                } else {
                    setDatas(datas);
                }
            } else {
                $.ajax({
                    "dataType": "json",
                    "success": function(datas, textStatus, jqXHR) {
                        let today = new Date();

                        datas['expires'] = today.setDate(today.getDate() + 7) // expires in next 7 days

                        setDatas(datas);

                        localStorage.setItem(cacheKey, JSON.stringify(datas));
                    },
                    "url": "http://localhost/phunsanit/snippets/PHP/json.json_encode.php",
                });
            }
        }

        function setDatas(datas) {
            // display json as text
            $('#datasA').text(JSON.stringify(datas));

            // your code here
           ....

        }

        // call
        getDatas();

enter link description here

How do I parse JSON from a Java HTTPResponse?

Instead of doing

Reader in = new BufferedReader(
    new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
StringBuilder builder= new StringBuilder();
char[] buf = new char[1000];
int l = 0;
while (l >= 0) {
    builder.append(buf, 0, l);
    l = in.read(buf);
}
JSONTokener tokener = new JSONTokener( builder.toString() );

You can do:

JSONTokener tokener = new JSONTokener(
                           IOUtils.toString(response.getEntity().getContent()) );

where IOUtils is from the commons IO library.

CSS3 Box Shadow on Top, Left, and Right Only

I fixed such a problem by putting a div down the nav link

 <div [ngClass]="{'nav-div': tab['active']}"></div>

and giving this css to it.

.nav-div {
    width: inherit;
    position: relative;
    height: 8px;
    background: white;
    top: 4px
  }

and nav link css as

 .nav-link {
    position: relative;
    top: 8px;

    &.active {
      box-shadow: rgba(0, 0, 0, 0.3) 0 1px 4px -1px;
    }
  }

Hope this helps!

Pass accepts header parameter to jquery ajax

I use jQuery.getJSON( url [, data ] [, success( data, textStatus, jqXHR ) ] ) for example:

var url="my.php";
$.getJSON( url, myObj )
.done(function( json ) { ... }) /* got JSON from server */
.fail(function( jqxhr, textStatus, error ) {
    var err = textStatus + ", " + error;
    console.log( "Failed to obtain JSON data from server: " + err );
  }); /* failed to get JSON */

getJSON is shorthand for:

$.ajax({
  dataType: "json",
  url: url,
  data: data,
  success: success
});

How can I refresh a page with jQuery?

You may want to use

location.reload(forceGet)

forceGet is a boolean and optional.

The default is false which reloads the page from the cache.

Set this parameter to true if you want to force the browser to get the page from the server to get rid of the cache as well.

Or just

location.reload()

if you want quick and easy with caching.

Posting JSON data via jQuery to ASP .NET MVC 4 controller action

The problem is your dataType and the format of your data parameter. I just tested this in a sandbox and the following works:

    [HttpPost]
    public string ConvertLogInfoToXml(string jsonOfLog)
    {
        return Convert.ToString(jsonOfLog);
    }

javascript

<input type="button" onclick="test()"/>

    <script type="text/javascript">

        function test() {
            data = { prop: 1, myArray: [1, "two", 3] };
            //'data' is much more complicated in my real application
            var jsonOfLog = JSON.stringify(data);

            $.ajax({
                type: 'POST',
                dataType: 'text',
                url: "Home/ConvertLogInfoToXml",
                data: "jsonOfLog=" + jsonOfLog,
                success: function (returnPayload) {
                    console && console.log("request succeeded");
                },
                error: function (xhr, ajaxOptions, thrownError) {
                    console && console.log("request failed");
                },

                processData: false,
                async: false
            });
        }

    </script>

Pay special attention to data, when sending text, you need to send a variable that matches the name of your parameter. It's not pretty, but it will get you your coveted unformatted string.

When running this, jsonOfLog looks like this in the server function:

    jsonOfLog   "{\"prop\":1,\"myArray\":[1,\"two\",3]}"    string

The HTTP POST header:

Key Value
Request POST /Home/ConvertLogInfoToXml HTTP/1.1
Accept  text/plain, */*; q=0.01
Content-Type    application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With    XMLHttpRequest
Referer http://localhost:50189/
Accept-Language en-US
Accept-Encoding gzip, deflate
User-Agent  Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
Host    localhost:50189
Content-Length  42
DNT 1
Connection  Keep-Alive
Cache-Control   no-cache
Cookie  EnableSSOUser=admin

The HTTP POST body:

jsonOfLog={"prop":1,"myArray":[1,"two",3]}

The response header:

Key Value
Cache-Control   private
Content-Type    text/html; charset=utf-8
Date    Fri, 28 Jun 2013 18:49:24 GMT
Response    HTTP/1.1 200 OK
Server  Microsoft-IIS/8.0
X-AspNet-Version    4.0.30319
X-AspNetMvc-Version 4.0
X-Powered-By    ASP.NET
X-SourceFiles   =?UTF-8?B?XFxwc2ZcaG9tZVxkb2N1bWVudHNcdmlzdWFsIHN0dWRpbyAyMDEyXFByb2plY3RzXE12YzRQbGF5Z3JvdW5kXE12YzRQbGF5Z3JvdW5kXEhvbWVcQ29udmVydExvZ0luZm9Ub1htbA==?=

The response body:

{"prop":1,"myArray":[1,"two",3]}

Java: How to check if object is null?

if (yourObject instanceof yourClassName) will evaluate to false if yourObject is null.

Print a variable in hexadecimal in Python

You mean you have a string of bytes in my_hex which you want to print out as hex numbers, right? E.g., let's take your example:

>>> my_string = "deadbeef"
>>> my_hex = my_string.decode('hex')  # python 2 only
>>> print my_hex
Þ  ¾ ï

This construction only works on Python 2; but you could write the same string as a literal, in either Python 2 or Python 3, like this:

my_hex = "\xde\xad\xbe\xef"

So, to the answer. Here's one way to print the bytes as hex integers:

>>> print " ".join(hex(ord(n)) for n in my_hex)
0xde 0xad 0xbe 0xef

The comprehension breaks the string into bytes, ord() converts each byte to the corresponding integer, and hex() formats each integer in the from 0x##. Then we add spaces in between.

Bonus: If you use this method with unicode strings (or Python 3 strings), the comprehension will give you unicode characters (not bytes), and you'll get the appropriate hex values even if they're larger than two digits.

Addendum: Byte strings

In Python 3 it is more likely you'll want to do this with a byte string; in that case, the comprehension already returns ints, so you have to leave out the ord() part and simply call hex() on them:

>>> my_hex = b'\xde\xad\xbe\xef'
>>> print(" ".join(hex(n) for n in my_hex))
0xde 0xad 0xbe 0xef

How to turn NaN from parseInt into 0 for an empty string?

Also this way, why not write a function and call it where ever required . I'm assuming it's the entry into the form fields to perform calculations.

var Nanprocessor = function (entry) {
    if(entry=="NaN") {
        return 0;
    } else {
        return entry;
    }
}

 outputfield.value = Nanprocessor(x); 

// where x is a value that is collected from a from field
// i.e say x =parseInt(formfield1.value);

what's wrong doing this?

Show and hide a View with a slide up/down animation

Using ObjectAnimator

private fun slideDown(view: View) {
    val height = view.height
    ObjectAnimator.ofFloat(view, "translationY", 0.toFloat(), height.toFloat()).apply {
        duration = 1000
        start()
    }
}

private fun slideUp(view: View) {
    val height = view.height
    ObjectAnimator.ofFloat(view, "translationY", height.toFloat(),0.toFloat()).apply {
        duration = 1000
        start()
    }
}

How should I throw a divide by zero exception in Java without actually dividing by zero?

public class ZeroDivisionException extends ArithmeticException {
    // ...
}

if (denominator == 0) {
    throw new ZeroDivisionException();
}

How to get char from string by index?

Previous answers cover about ASCII character at a certain index.

It is a little bit troublesome to get a Unicode character at a certain index in Python 2.

E.g., with s = '????????' which is <type 'str'>,

__getitem__, e.g., s[i] , does not lead you to where you desire. It will spit out semething like ?. (Many Unicode characters are more than 1 byte but __getitem__ in Python 2 is incremented by 1 byte.)

In this Python 2 case, you can solve the problem by decoding:

s = '????????'
s = s.decode('utf-8')
for i in range(len(s)):
    print s[i]

Why does IE9 switch to compatibility mode on my website?

I've posted this comment on a seperate StackOverflow thread, but thought it was worth repeating here:

For our in-house ASP.Net app, adding the "X-UA-Compatible" tag on the web page, in the web.config or in the code-behind made absolutely no difference.

The only thing that worked for us was to manually turn off this setting in IE8:

enter image description here

(Sigh.)

This problem only seems to happen with IE8 & IE9 on intranet sites. External websites will work fine and use the correct version of IE8/9, but for internal websites, IE9 suddenly decides it's actually IE7, and doesn't have any HTML 5 support.

No, I don't quite understand this logic either.

My reluctant solution has been to test whether the browser has HTML 5 support (by creating a canvas, and testing if it's valid), and displaying this message to the user if it's not valid:

enter image description here

It's not particularly user-friendly, but getting the user to turn off this annoying setting seems to be the only way to let them run in-house HTML 5 web apps properly.

Or get the users to use Chrome. ;-)

How to call a method after a delay in Android

you can use Handler inside UIThread:

runOnUiThread(new Runnable() {

    @Override
    public void run() {
         final Handler handler = new Handler();
         handler.postDelayed(new Runnable() {
           @Override
           public void run() {
               //add your code here
           }
         }, 1000);

    }
});

cpp / c++ get pointer value or depointerize pointer

To get the value of a pointer, just de-reference the pointer.

int *ptr;
int value;
*ptr = 9;

value = *ptr;

value is now 9.

I suggest you read more about pointers, this is their base functionality.

Convert a String of Hex into ASCII in Java

Just use a for loop to go through each couple of characters in the string, convert them to a character and then whack the character on the end of a string builder:

String hex = "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";
StringBuilder output = new StringBuilder();
for (int i = 0; i < hex.length(); i+=2) {
    String str = hex.substring(i, i+2);
    output.append((char)Integer.parseInt(str, 16));
}
System.out.println(output);

Or (Java 8+) if you're feeling particularly uncouth, use the infamous "fixed width string split" hack to enable you to do a one-liner with streams instead:

System.out.println(Arrays
        .stream(hex.split("(?<=\\G..)")) //https://stackoverflow.com/questions/2297347/splitting-a-string-at-every-n-th-character
        .map(s -> Character.toString((char)Integer.parseInt(s, 16)))
        .collect(Collectors.joining()));

Either way, this gives a few lines starting with the following:

uTorrent\Completed\nfsuc_ost_by_mustang\Pendulum-9,000 Miles.mp3

Hmmm... :-)

Stylesheet not loaded because of MIME-type

In most cases, this could be simply the CSS file path is wrong. So the web server returns status: 404 with some Not Found content payload of html type.

The browser follows this (wrong) path from <link rel="stylesheet" ...> tag with the intention of applying CSS styles. But the returned content type contradicts so that it logs an error.

Seaborn Barplot - Displaying Values

plt.figure(figsize=(15,10))
graph = sns.barplot(x='name_column_x_axis', y="name_column_x_axis", data = dataframe_name ,  color="salmon")
for p in graph.patches:
        graph.annotate('{:.0f}'.format(p.get_height()), (p.get_x()+0.3, p.get_height()),
                    ha='center', va='bottom',
                    color= 'black')

Oracle Differences between NVL and Coalesce

There is also difference is in plan handling.

Oracle is able form an optimized plan with concatenation of branch filters when search contains comparison of nvl result with an indexed column.

create table tt(a, b) as
select level, mod(level,10)
from dual
connect by level<=1e4;

alter table tt add constraint ix_tt_a primary key(a);
create index ix_tt_b on tt(b);

explain plan for
select * from tt
where a=nvl(:1,a)
  and b=:2;

explain plan for
select * from tt
where a=coalesce(:1,a)
  and b=:2;

nvl:

-----------------------------------------------------------------------------------------
| Id  | Operation                     | Name    | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT              |         |     2 |    52 |     2   (0)| 00:00:01 |
|   1 |  CONCATENATION                |         |       |       |            |          |
|*  2 |   FILTER                      |         |       |       |            |          |
|*  3 |    TABLE ACCESS BY INDEX ROWID| TT      |     1 |    26 |     1   (0)| 00:00:01 |
|*  4 |     INDEX RANGE SCAN          | IX_TT_B |     7 |       |     1   (0)| 00:00:01 |
|*  5 |   FILTER                      |         |       |       |            |          |
|*  6 |    TABLE ACCESS BY INDEX ROWID| TT      |     1 |    26 |     1   (0)| 00:00:01 |
|*  7 |     INDEX UNIQUE SCAN         | IX_TT_A |     1 |       |     1   (0)| 00:00:01 |
-----------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
   2 - filter(:1 IS NULL)
   3 - filter("A" IS NOT NULL)
   4 - access("B"=TO_NUMBER(:2))
   5 - filter(:1 IS NOT NULL)
   6 - filter("B"=TO_NUMBER(:2))
   7 - access("A"=:1)

coalesce:

---------------------------------------------------------------------------------------
| Id  | Operation                   | Name    | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |         |     1 |    26 |     1   (0)| 00:00:01 |
|*  1 |  TABLE ACCESS BY INDEX ROWID| TT      |     1 |    26 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IX_TT_B |    40 |       |     1   (0)| 00:00:01 |
---------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter("A"=COALESCE(:1,"A"))
   2 - access("B"=TO_NUMBER(:2))

Credits go to http://www.xt-r.com/2012/03/nvl-coalesce-concatenation.html.

Parsing XML with namespace in Python via 'ElementTree'

Here's how to do this with lxml without having to hard-code the namespaces or scan the text for them (as Martijn Pieters mentions):

from lxml import etree
tree = etree.parse("filename")
root = tree.getroot()
root.findall('owl:Class', root.nsmap)

UPDATE:

5 years later I'm still running into variations of this issue. lxml helps as I showed above, but not in every case. The commenters may have a valid point regarding this technique when it comes merging documents, but I think most people are having difficulty simply searching documents.

Here's another case and how I handled it:

<?xml version="1.0" ?><Tag1 xmlns="http://www.mynamespace.com/prefix">
<Tag2>content</Tag2></Tag1>

xmlns without a prefix means that unprefixed tags get this default namespace. This means when you search for Tag2, you need to include the namespace to find it. However, lxml creates an nsmap entry with None as the key, and I couldn't find a way to search for it. So, I created a new namespace dictionary like this

namespaces = {}
# response uses a default namespace, and tags don't mention it
# create a new ns map using an identifier of our choice
for k,v in root.nsmap.iteritems():
    if not k:
        namespaces['myprefix'] = v
e = root.find('myprefix:Tag2', namespaces)

bash script read all the files in directory

To write it with a while loop you can do:

ls -f /var | while read -r file; do cmd $file; done

The primary disadvantage of this is that cmd is run in a subshell, which causes some difficulty if you are trying to set variables. The main advantages are that the shell does not need to load all of the filenames into memory, and there is no globbing. When you have a lot of files in the directory, those advantages are important (that's why I use -f on ls; in a large directory ls itself can take several tens of seconds to run and -f speeds that up appreciably. In such cases 'for file in /var/*' will likely fail with a glob error.)

how to remove only one style property with jquery

You can also replace "-moz-user-select:none" with "-moz-user-select:inherit". This will inherit the style value from any parent style or from the default style if no parent style was defined.

Graphical user interface Tutorial in C

My favourite UI tutorials all come from zetcode.com:

wxWidgets (C++, cross platform)
Win32api GUI (C, Windows)
GTK+ (C, cross platform)
Qt4 Tutorial (C++, cross platform)

These are tutorials I'd consider to be "starting tutorials". The example tutorial gets you up and going, but doesn't show you anything too advanced or give much explanation. Still, often, I find the big problem is "how do I start?" and these have always proved useful to me.

java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex in Android Studio 3.0

Enable Multidex through build.gradle of your app module

multiDexEnabled true

Same as below -

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.xx.xxx"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        multiDexEnabled true //Add this
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            shrinkResources true
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

Then follow below steps -

From the Build menu -> press the Clean Project button.
When task completed, press the Rebuild Project button from the Build menu.
From menu File -> Invalidate cashes / Restart

compile is now deprecated so it's better to use implementation or api

What does AngularJS do better than jQuery?

Data-Binding

You go around making your webpage, and keep on putting {{data bindings}} whenever you feel you would have dynamic data. Angular will then provide you a $scope handler, which you can populate (statically or through calls to the web server).

This is a good understanding of data-binding. I think you've got that down.

DOM Manipulation

For simple DOM manipulation, which doesnot involve data manipulation (eg: color changes on mousehover, hiding/showing elements on click), jQuery or old-school js is sufficient and cleaner. This assumes that the model in angular's mvc is anything that reflects data on the page, and hence, css properties like color, display/hide, etc changes dont affect the model.

I can see your point here about "simple" DOM manipulation being cleaner, but only rarely and it would have to be really "simple". I think DOM manipulation is one the areas, just like data-binding, where Angular really shines. Understanding this will also help you see how Angular considers its views.

I'll start by comparing the Angular way with a vanilla js approach to DOM manipulation. Traditionally, we think of HTML as not "doing" anything and write it as such. So, inline js, like "onclick", etc are bad practice because they put the "doing" in the context of HTML, which doesn't "do". Angular flips that concept on its head. As you're writing your view, you think of HTML as being able to "do" lots of things. This capability is abstracted away in angular directives, but if they already exist or you have written them, you don't have to consider "how" it is done, you just use the power made available to you in this "augmented" HTML that angular allows you to use. This also means that ALL of your view logic is truly contained in the view, not in your javascript files. Again, the reasoning is that the directives written in your javascript files could be considered to be increasing the capability of HTML, so you let the DOM worry about manipulating itself (so to speak). I'll demonstrate with a simple example.

This is the markup we want to use. I gave it an intuitive name.

<div rotate-on-click="45"></div>

First, I'd just like to comment that if we've given our HTML this functionality via a custom Angular Directive, we're already done. That's a breath of fresh air. More on that in a moment.

Implementation with jQuery

live demo here (click).

function rotate(deg, elem) {
  $(elem).css({
    webkitTransform: 'rotate('+deg+'deg)', 
    mozTransform: 'rotate('+deg+'deg)', 
    msTransform: 'rotate('+deg+'deg)', 
    oTransform: 'rotate('+deg+'deg)', 
    transform: 'rotate('+deg+'deg)'    
  });
}

function addRotateOnClick($elems) {
  $elems.each(function(i, elem) {
    var deg = 0;
    $(elem).click(function() {
      deg+= parseInt($(this).attr('rotate-on-click'), 10);
      rotate(deg, this);
    });
  });
}

addRotateOnClick($('[rotate-on-click]'));

Implementation with Angular

live demo here (click).

app.directive('rotateOnClick', function() {
  return {
    restrict: 'A',
    link: function(scope, element, attrs) {
      var deg = 0;
      element.bind('click', function() {
        deg+= parseInt(attrs.rotateOnClick, 10);
        element.css({
          webkitTransform: 'rotate('+deg+'deg)', 
          mozTransform: 'rotate('+deg+'deg)', 
          msTransform: 'rotate('+deg+'deg)', 
          oTransform: 'rotate('+deg+'deg)', 
          transform: 'rotate('+deg+'deg)'    
        });
      });
    }
  };
});

Pretty light, VERY clean and that's just a simple manipulation! In my opinion, the angular approach wins in all regards, especially how the functionality is abstracted away and the dom manipulation is declared in the DOM. The functionality is hooked onto the element via an html attribute, so there is no need to query the DOM via a selector, and we've got two nice closures - one closure for the directive factory where variables are shared across all usages of the directive, and one closure for each usage of the directive in the link function (or compile function).

Two-way data binding and directives for DOM manipulation are only the start of what makes Angular awesome. Angular promotes all code being modular, reusable, and easily testable and also includes a single-page app routing system. It is important to note that jQuery is a library of commonly needed convenience/cross-browser methods, but Angular is a full featured framework for creating single page apps. The angular script actually includes its own "lite" version of jQuery so that some of the most essential methods are available. Therefore, you could argue that using Angular IS using jQuery (lightly), but Angular provides much more "magic" to help you in the process of creating apps.

This is a great post for more related information: How do I “think in AngularJS” if I have a jQuery background?

General differences.

The above points are aimed at the OP's specific concerns. I'll also give an overview of the other important differences. I suggest doing additional reading about each topic as well.

Angular and jQuery can't reasonably be compared.

Angular is a framework, jQuery is a library. Frameworks have their place and libraries have their place. However, there is no question that a good framework has more power in writing an application than a library. That's exactly the point of a framework. You're welcome to write your code in plain JS, or you can add in a library of common functions, or you can add a framework to drastically reduce the code you need to accomplish most things. Therefore, a more appropriate question is:

Why use a framework?

Good frameworks can help architect your code so that it is modular (therefore reusable), DRY, readable, performant and secure. jQuery is not a framework, so it doesn't help in these regards. We've all seen the typical walls of jQuery spaghetti code. This isn't jQuery's fault - it's the fault of developers that don't know how to architect code. However, if the devs did know how to architect code, they would end up writing some kind of minimal "framework" to provide the foundation (achitecture, etc) I discussed a moment ago, or they would add something in. For example, you might add RequireJS to act as part of your framework for writing good code.

Here are some things that modern frameworks are providing:

Templating
Data-binding
routing (single page app)
clean, modular, reusable architecture
security
additional functions/features for convenience

Before I further discuss Angular, I'd like to point out that Angular isn't the only one of its kind. Durandal, for example, is a framework built on top of jQuery, Knockout, and RequireJS. Again, jQuery cannot, by itself, provide what Knockout, RequireJS, and the whole framework built on top them can. It's just not comparable.

If you need to destroy a planet and you have a Death Star, use the Death star.

Angular (revisited).

Building on my previous points about what frameworks provide, I'd like to commend the way that Angular provides them and try to clarify why this is matter of factually superior to jQuery alone.

DOM reference.

In my above example, it is just absolutely unavoidable that jQuery has to hook onto the DOM in order to provide functionality. That means that the view (html) is concerned about functionality (because it is labeled with some kind of identifier - like "image slider") and JavaScript is concerned about providing that functionality. Angular eliminates that concept via abstraction. Properly written code with Angular means that the view is able to declare its own behavior. If I want to display a clock:

<clock></clock>

Done.

Yes, we need to go to JavaScript to make that mean something, but we're doing this in the opposite way of the jQuery approach. Our Angular directive (which is in it's own little world) has "augumented" the html and the html hooks the functionality into itself.

MVW Architecure / Modules / Dependency Injection

Angular gives you a straightforward way to structure your code. View things belong in the view (html), augmented view functionality belongs in directives, other logic (like ajax calls) and functions belong in services, and the connection of services and logic to the view belongs in controllers. There are some other angular components as well that help deal with configuration and modification of services, etc. Any functionality you create is automatically available anywhere you need it via the Injector subsystem which takes care of Dependency Injection throughout the application. When writing an application (module), I break it up into other reusable modules, each with their own reusable components, and then include them in the bigger project. Once you solve a problem with Angular, you've automatically solved it in a way that is useful and structured for reuse in the future and easily included in the next project. A HUGE bonus to all of this is that your code will be much easier to test.

It isn't easy to make things "work" in Angular.

THANK GOODNESS. The aforementioned jQuery spaghetti code resulted from a dev that made something "work" and then moved on. You can write bad Angular code, but it's much more difficult to do so, because Angular will fight you about it. This means that you have to take advantage (at least somewhat) to the clean architecture it provides. In other words, it's harder to write bad code with Angular, but more convenient to write clean code.

Angular is far from perfect. The web development world is always growing and changing and there are new and better ways being put forth to solve problems. Facebook's React and Flux, for example, have some great advantages over Angular, but come with their own drawbacks. Nothing's perfect, but Angular has been and is still awesome for now. Just as jQuery once helped the web world move forward, so has Angular, and so will many to come.

How to get Real IP from Visitor?

This is the most common technique I've seen:

function getUserIP() {
    if( array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ) {
        if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',')>0) {
            $addr = explode(",",$_SERVER['HTTP_X_FORWARDED_FOR']);
            return trim($addr[0]);
        } else {
            return $_SERVER['HTTP_X_FORWARDED_FOR'];
        }
    }
    else {
        return $_SERVER['REMOTE_ADDR'];
    }
}

Note that it does not guarantee it you will get always the correct user IP because there are many ways to hide it.

How can I center a div within another div?

It would work giving the #container div width:80% (any width less than the main content and have given in %, so that it manages well from both left and right) and giving margin:0px auto; or margin:0 auto; (both work fine).

Excel Macro : How can I get the timestamp in "yyyy-MM-dd hh:mm:ss" format?

Try with: format(now(), "yyyy-MM-dd hh:mm:ss")

How to compare strings

You could use strcmp():

/* strcmp example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char szKey[] = "apple";
  char szInput[80];
  do {
     printf ("Guess my favourite fruit? ");
     gets (szInput);
  } while (strcmp (szKey,szInput) != 0);
  puts ("Correct answer!");
  return 0;
}

Angular.js: How does $eval work and why is it different from vanilla eval?

I think one of the original questions here was not answered. I believe that vanilla eval() is not used because then angular apps would not work as Chrome apps, which explicitly prevent eval() from being used for security reasons.

Android Studio : unmappable character for encoding UTF-8

If above answeres did not work, then you can try my answer because it worked for me.
Here's what worked for me.

Close Android Studio
Go to C:\Usersyour username
Locate the Android Studio settings directory named .AndroidStudioX.X (X.X being the version)
C:\Users\my_user_name.AndroidStudio4.0\system\caches
Delete the caches folder and open android studio

This should fix the issue.

Is 'bool' a basic datatype in C++?

C is meant to be a step above assembly language. The C if-statement is really just syntactical sugar for "branch-if-zero", so the idea of booleans as an independent datatype was a foreign concept at the time. (1)

Even now, C/C++ booleans are usually little more than an alias for a single byte data type. As such, it's really more of a purposing label than an independent datatype.

(1) Of course, modern compilers are a bit more advanced in their handling of if statements. This is from the standpoint of C as a new language.

How to overlay image with color in CSS?

Use mutple backgorund on the element, and use a linear-gradient as your color overlay by declaring both start and end color-stops as the same value.

Note that layers in a multi-background declaration are read much like they are rendered, top-to-bottom, so put your overlay first, then your bg image:

#header {
  background: 
    linear-gradient(to bottom, rgba(100, 100, 0, 0.5), rgba(100, 100, 0, 0.5)) cover,
    url(../img/bg.jpg) 0 0 no-repeat fixed;
  height: 100%;
  overflow: hidden;
  color: #FFFFFF
}

PHP - syntax error, unexpected T_CONSTANT_ENCAPSED_STRING

You have a sintax error in your code:

try changing this line

$out.='<option value=''.$key.'">'.$value["name"].';

with

$out.='<option value="'.$key.'">'.$value["name"].'</option>';

Global Angular CLI version greater than local version

This is how I fixed it. in Visual Studio Code's terminal, First cache clean

npm cache clean --force

Then updated cli

ng update @angular/cli

If any module missing after this, use below command

npm install

Android: Tabs at the BOTTOM

Try it ;) Just watch the content of the FrameLayout(@id/tabcontent), because I don't know how it will handle in case of scrolling... In my case it works because I used ListView as the content of my tabs. :) Hope it helps.

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <RelativeLayout 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent">
        <FrameLayout android:id="@android:id/tabcontent"
             android:layout_width="fill_parent" 
             android:layout_height="fill_parent"
             android:layout_alignParentTop="true" 
             android:layout_above="@android:id/tabs" />
    <TabWidget android:id="@android:id/tabs"
             android:layout_width="fill_parent" 
             android:layout_height="wrap_content"
             android:layout_alignParentBottom="true" />
    </RelativeLayout>
</TabHost>

Multiple linear regression in Python

Here is a little work around that I created. I checked it with R and it works correct.

import numpy as np
import statsmodels.api as sm

y = [1,2,3,4,3,4,5,4,5,5,4,5,4,5,4,5,6,5,4,5,4,3,4]

x = [
     [4,2,3,4,5,4,5,6,7,4,8,9,8,8,6,6,5,5,5,5,5,5,5],
     [4,1,2,3,4,5,6,7,5,8,7,8,7,8,7,8,7,7,7,7,7,6,5],
     [4,1,2,5,6,7,8,9,7,8,7,8,7,7,7,7,7,7,6,6,4,4,4]
     ]

def reg_m(y, x):
    ones = np.ones(len(x[0]))
    X = sm.add_constant(np.column_stack((x[0], ones)))
    for ele in x[1:]:
        X = sm.add_constant(np.column_stack((ele, X)))
    results = sm.OLS(y, X).fit()
    return results

Result:

print reg_m(y, x).summary()

Output:

                            OLS Regression Results                            
==============================================================================
Dep. Variable:                      y   R-squared:                       0.535
Model:                            OLS   Adj. R-squared:                  0.461
Method:                 Least Squares   F-statistic:                     7.281
Date:                Tue, 19 Feb 2013   Prob (F-statistic):            0.00191
Time:                        21:51:28   Log-Likelihood:                -26.025
No. Observations:                  23   AIC:                             60.05
Df Residuals:                      19   BIC:                             64.59
Df Model:                           3                                         
==============================================================================
                 coef    std err          t      P>|t|      [95.0% Conf. Int.]
------------------------------------------------------------------------------
x1             0.2424      0.139      1.739      0.098        -0.049     0.534
x2             0.2360      0.149      1.587      0.129        -0.075     0.547
x3            -0.0618      0.145     -0.427      0.674        -0.365     0.241
const          1.5704      0.633      2.481      0.023         0.245     2.895

==============================================================================
Omnibus:                        6.904   Durbin-Watson:                   1.905
Prob(Omnibus):                  0.032   Jarque-Bera (JB):                4.708
Skew:                          -0.849   Prob(JB):                       0.0950
Kurtosis:                       4.426   Cond. No.                         38.6

pandas provides a convenient way to run OLS as given in this answer:

Run an OLS regression with Pandas Data Frame

Bootstrap col-md-offset-* not working

Should be :

<h2 class="col-md-4 col-md-offset-1">Browse.</h2>
<h2 class="col-md-4 col-md-offset-2">create.</h2>
<h2 class="col-md-4 col-md-offset-3">share.</h2>

What's a standard way to do a no-op in python?

If you need a function that behaves as a nop, try

nop = lambda *a, **k: None
nop()

Sometimes I do stuff like this when I'm making dependencies optional:

try:
    import foo
    bar=foo.bar
    baz=foo.baz
except:
    bar=nop
    baz=nop

# Doesn't break when foo is missing:
bar()
baz()

Git: How to rebase to a specific commit?

Since rebasing is so fundamental, here's an expansion of Nestor Milyaev's answer. Combining jsz's and Simon South's comments from Adam Dymitruk's answer yields this command which works on the topic branch regardless of whether it branches from the master branch's commit A or C:

git checkout topic
git rebase --onto <commit-B> <pre-rebase-A-or-post-rebase-C-or-base-branch-name>

Note that the last argument is required (otherwise it rewinds your branch to commit B).

Examples:

# if topic branches from master commit A:
git checkout topic
git rebase --onto <commit-B> <commit-A>

# if topic branches from master commit C:
git checkout topic
git rebase --onto <commit-B> <commit-C>

# regardless of whether topic branches from master commit A or C:
git checkout topic
git rebase --onto <commit-B> master

So the last command is the one that I typically use.

How do I get extra data from intent on Android?

Pass the intent with value on First Activity:

Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
intent.putExtra("uid", uid.toString());
intent.putExtra("pwd", pwd.toString());
startActivity(intent);

Receive intent on second Activity;-

Intent intent = getIntent();
String user = intent.getStringExtra("uid");
String pass = intent.getStringExtra("pwd");

We use generally two method in intent to send the value and to get the value. For sending the value we will use intent.putExtra("key", Value); and during receive intent on another activity we will use intent.getStringExtra("key"); to get the intent data as String or use some other available method to get other types of data (Integer, Boolean, etc.). The key may be any keyword to identify the value means that what value you are sharing. Hope it will work for you.

JavaScript + Unicode regexes

I'm answering this question
What would be the equivalent for \p{Lu} or \p{Ll} in regExp for js?
since it was marked as an exact duplicate of the current old question.

Querying the UCD Database of Unicode 12, \p{Lu} generates 1,788 code points.

Converting to UTF-16 yields the class construct equivalency.
It's only a 4k character string and is easily doable in any regex engines.

(?:[\u0041-\u005A\u00C0-\u00D6\u00D8-\u00DE\u0100\u0102\u0104\u0106\u0108\u010A\u010C\u010E\u0110\u0112\u0114\u0116\u0118\u011A\u011C\u011E\u0120\u0122\u0124\u0126\u0128\u012A\u012C\u012E\u0130\u0132\u0134\u0136\u0139\u013B\u013D\u013F\u0141\u0143\u0145\u0147\u014A\u014C\u014E\u0150\u0152\u0154\u0156\u0158\u015A\u015C\u015E\u0160\u0162\u0164\u0166\u0168\u016A\u016C\u016E\u0170\u0172\u0174\u0176\u0178-\u0179\u017B\u017D\u0181-\u0182\u0184\u0186-\u0187\u0189-\u018B\u018E-\u0191\u0193-\u0194\u0196-\u0198\u019C-\u019D\u019F-\u01A0\u01A2\u01A4\u01A6-\u01A7\u01A9\u01AC\u01AE-\u01AF\u01B1-\u01B3\u01B5\u01B7-\u01B8\u01BC\u01C4\u01C7\u01CA\u01CD\u01CF\u01D1\u01D3\u01D5\u01D7\u01D9\u01DB\u01DE\u01E0\u01E2\u01E4\u01E6\u01E8\u01EA\u01EC\u01EE\u01F1\u01F4\u01F6-\u01F8\u01FA\u01FC\u01FE\u0200\u0202\u0204\u0206\u0208\u020A\u020C\u020E\u0210\u0212\u0214\u0216\u0218\u021A\u021C\u021E\u0220\u0222\u0224\u0226\u0228\u022A\u022C\u022E\u0230\u0232\u023A-\u023B\u023D-\u023E\u0241\u0243-\u0246\u0248\u024A\u024C\u024E\u0370\u0372\u0376\u037F\u0386\u0388-\u038A\u038C\u038E-\u038F\u0391-\u03A1\u03A3-\u03AB\u03CF\u03D2-\u03D4\u03D8\u03DA\u03DC\u03DE\u03E0\u03E2\u03E4\u03E6\u03E8\u03EA\u03EC\u03EE\u03F4\u03F7\u03F9-\u03FA\u03FD-\u042F\u0460\u0462\u0464\u0466\u0468\u046A\u046C\u046E\u0470\u0472\u0474\u0476\u0478\u047A\u047C\u047E\u0480\u048A\u048C\u048E\u0490\u0492\u0494\u0496\u0498\u049A\u049C\u049E\u04A0\u04A2\u04A4\u04A6\u04A8\u04AA\u04AC\u04AE\u04B0\u04B2\u04B4\u04B6\u04B8\u04BA\u04BC\u04BE\u04C0-\u04C1\u04C3\u04C5\u04C7\u04C9\u04CB\u04CD\u04D0\u04D2\u04D4\u04D6\u04D8\u04DA\u04DC\u04DE\u04E0\u04E2\u04E4\u04E6\u04E8\u04EA\u04EC\u04EE\u04F0\u04F2\u04F4\u04F6\u04F8\u04FA\u04FC\u04FE\u0500\u0502\u0504\u0506\u0508\u050A\u050C\u050E\u0510\u0512\u0514\u0516\u0518\u051A\u051C\u051E\u0520\u0522\u0524\u0526\u0528\u052A\u052C\u052E\u0531-\u0556\u10A0-\u10C5\u10C7\u10CD\u13A0-\u13F5\u1C90-\u1CBA\u1CBD-\u1CBF\u1E00\u1E02\u1E04\u1E06\u1E08\u1E0A\u1E0C\u1E0E\u1E10\u1E12\u1E14\u1E16\u1E18\u1E1A\u1E1C\u1E1E\u1E20\u1E22\u1E24\u1E26\u1E28\u1E2A\u1E2C\u1E2E\u1E30\u1E32\u1E34\u1E36\u1E38\u1E3A\u1E3C\u1E3E\u1E40\u1E42\u1E44\u1E46\u1E48\u1E4A\u1E4C\u1E4E\u1E50\u1E52\u1E54\u1E56\u1E58\u1E5A\u1E5C\u1E5E\u1E60\u1E62\u1E64\u1E66\u1E68\u1E6A\u1E6C\u1E6E\u1E70\u1E72\u1E74\u1E76\u1E78\u1E7A\u1E7C\u1E7E\u1E80\u1E82\u1E84\u1E86\u1E88\u1E8A\u1E8C\u1E8E\u1E90\u1E92\u1E94\u1E9E\u1EA0\u1EA2\u1EA4\u1EA6\u1EA8\u1EAA\u1EAC\u1EAE\u1EB0\u1EB2\u1EB4\u1EB6\u1EB8\u1EBA\u1EBC\u1EBE\u1EC0\u1EC2\u1EC4\u1EC6\u1EC8\u1ECA\u1ECC\u1ECE\u1ED0\u1ED2\u1ED4\u1ED6\u1ED8\u1EDA\u1EDC\u1EDE\u1EE0\u1EE2\u1EE4\u1EE6\u1EE8\u1EEA\u1EEC\u1EEE\u1EF0\u1EF2\u1EF4\u1EF6\u1EF8\u1EFA\u1EFC\u1EFE\u1F08-\u1F0F\u1F18-\u1F1D\u1F28-\u1F2F\u1F38-\u1F3F\u1F48-\u1F4D\u1F59\u1F5B\u1F5D\u1F5F\u1F68-\u1F6F\u1FB8-\u1FBB\u1FC8-\u1FCB\u1FD8-\u1FDB\u1FE8-\u1FEC\u1FF8-\u1FFB\u2102\u2107\u210B-\u210D\u2110-\u2112\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u2130-\u2133\u213E-\u213F\u2145\u2183\u2C00-\u2C2E\u2C60\u2C62-\u2C64\u2C67\u2C69\u2C6B\u2C6D-\u2C70\u2C72\u2C75\u2C7E-\u2C80\u2C82\u2C84\u2C86\u2C88\u2C8A\u2C8C\u2C8E\u2C90\u2C92\u2C94\u2C96\u2C98\u2C9A\u2C9C\u2C9E\u2CA0\u2CA2\u2CA4\u2CA6\u2CA8\u2CAA\u2CAC\u2CAE\u2CB0\u2CB2\u2CB4\u2CB6\u2CB8\u2CBA\u2CBC\u2CBE\u2CC0\u2CC2\u2CC4\u2CC6\u2CC8\u2CCA\u2CCC\u2CCE\u2CD0\u2CD2\u2CD4\u2CD6\u2CD8\u2CDA\u2CDC\u2CDE\u2CE0\u2CE2\u2CEB\u2CED\u2CF2\uA640\uA642\uA644\uA646\uA648\uA64A\uA64C\uA64E\uA650\uA652\uA654\uA656\uA658\uA65A\uA65C\uA65E\uA660\uA662\uA664\uA666\uA668\uA66A\uA66C\uA680\uA682\uA684\uA686\uA688\uA68A\uA68C\uA68E\uA690\uA692\uA694\uA696\uA698\uA69A\uA722\uA724\uA726\uA728\uA72A\uA72C\uA72E\uA732\uA734\uA736\uA738\uA73A\uA73C\uA73E\uA740\uA742\uA744\uA746\uA748\uA74A\uA74C\uA74E\uA750\uA752\uA754\uA756\uA758\uA75A\uA75C\uA75E\uA760\uA762\uA764\uA766\uA768\uA76A\uA76C\uA76E\uA779\uA77B\uA77D-\uA77E\uA780\uA782\uA784\uA786\uA78B\uA78D\uA790\uA792\uA796\uA798\uA79A\uA79C\uA79E\uA7A0\uA7A2\uA7A4\uA7A6\uA7A8\uA7AA-\uA7AE\uA7B0-\uA7B4\uA7B6\uA7B8\uA7BA\uA7BC\uA7BE\uA7C2\uA7C4-\uA7C6\uFF21-\uFF3A]|(?:\uD801[\uDC00-\uDC27\uDCB0-\uDCD3]|\uD803[\uDC80-\uDCB2]|\uD806[\uDCA0-\uDCBF]|\uD81B[\uDE40-\uDE5F]|\uD835[\uDC00-\uDC19\uDC34-\uDC4D\uDC68-\uDC81\uDC9C\uDC9E-\uDC9F\uDCA2\uDCA5-\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB5\uDCD0-\uDCE9\uDD04-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD38-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD6C-\uDD85\uDDA0-\uDDB9\uDDD4-\uDDED\uDE08-\uDE21\uDE3C-\uDE55\uDE70-\uDE89\uDEA8-\uDEC0\uDEE2-\uDEFA\uDF1C-\uDF34\uDF56-\uDF6E\uDF90-\uDFA8\uDFCA]|\uD83A[\uDD00-\uDD21]))

Querying the UCD database of Unicode 12, \p{Ll} generates 2,151 code points.

Converting to UTF-16 yields the class construct equivalency.

(?:[\u0061-\u007A\u00B5\u00DF-\u00F6\u00F8-\u00FF\u0101\u0103\u0105\u0107\u0109\u010B\u010D\u010F\u0111\u0113\u0115\u0117\u0119\u011B\u011D\u011F\u0121\u0123\u0125\u0127\u0129\u012B\u012D\u012F\u0131\u0133\u0135\u0137-\u0138\u013A\u013C\u013E\u0140\u0142\u0144\u0146\u0148-\u0149\u014B\u014D\u014F\u0151\u0153\u0155\u0157\u0159\u015B\u015D\u015F\u0161\u0163\u0165\u0167\u0169\u016B\u016D\u016F\u0171\u0173\u0175\u0177\u017A\u017C\u017E-\u0180\u0183\u0185\u0188\u018C-\u018D\u0192\u0195\u0199-\u019B\u019E\u01A1\u01A3\u01A5\u01A8\u01AA-\u01AB\u01AD\u01B0\u01B4\u01B6\u01B9-\u01BA\u01BD-\u01BF\u01C6\u01C9\u01CC\u01CE\u01D0\u01D2\u01D4\u01D6\u01D8\u01DA\u01DC-\u01DD\u01DF\u01E1\u01E3\u01E5\u01E7\u01E9\u01EB\u01ED\u01EF-\u01F0\u01F3\u01F5\u01F9\u01FB\u01FD\u01FF\u0201\u0203\u0205\u0207\u0209\u020B\u020D\u020F\u0211\u0213\u0215\u0217\u0219\u021B\u021D\u021F\u0221\u0223\u0225\u0227\u0229\u022B\u022D\u022F\u0231\u0233-\u0239\u023C\u023F-\u0240\u0242\u0247\u0249\u024B\u024D\u024F-\u0293\u0295-\u02AF\u0371\u0373\u0377\u037B-\u037D\u0390\u03AC-\u03CE\u03D0-\u03D1\u03D5-\u03D7\u03D9\u03DB\u03DD\u03DF\u03E1\u03E3\u03E5\u03E7\u03E9\u03EB\u03ED\u03EF-\u03F3\u03F5\u03F8\u03FB-\u03FC\u0430-\u045F\u0461\u0463\u0465\u0467\u0469\u046B\u046D\u046F\u0471\u0473\u0475\u0477\u0479\u047B\u047D\u047F\u0481\u048B\u048D\u048F\u0491\u0493\u0495\u0497\u0499\u049B\u049D\u049F\u04A1\u04A3\u04A5\u04A7\u04A9\u04AB\u04AD\u04AF\u04B1\u04B3\u04B5\u04B7\u04B9\u04BB\u04BD\u04BF\u04C2\u04C4\u04C6\u04C8\u04CA\u04CC\u04CE-\u04CF\u04D1\u04D3\u04D5\u04D7\u04D9\u04DB\u04DD\u04DF\u04E1\u04E3\u04E5\u04E7\u04E9\u04EB\u04ED\u04EF\u04F1\u04F3\u04F5\u04F7\u04F9\u04FB\u04FD\u04FF\u0501\u0503\u0505\u0507\u0509\u050B\u050D\u050F\u0511\u0513\u0515\u0517\u0519\u051B\u051D\u051F\u0521\u0523\u0525\u0527\u0529\u052B\u052D\u052F\u0560-\u0588\u10D0-\u10FA\u10FD-\u10FF\u13F8-\u13FD\u1C80-\u1C88\u1D00-\u1D2B\u1D6B-\u1D77\u1D79-\u1D9A\u1E01\u1E03\u1E05\u1E07\u1E09\u1E0B\u1E0D\u1E0F\u1E11\u1E13\u1E15\u1E17\u1E19\u1E1B\u1E1D\u1E1F\u1E21\u1E23\u1E25\u1E27\u1E29\u1E2B\u1E2D\u1E2F\u1E31\u1E33\u1E35\u1E37\u1E39\u1E3B\u1E3D\u1E3F\u1E41\u1E43\u1E45\u1E47\u1E49\u1E4B\u1E4D\u1E4F\u1E51\u1E53\u1E55\u1E57\u1E59\u1E5B\u1E5D\u1E5F\u1E61\u1E63\u1E65\u1E67\u1E69\u1E6B\u1E6D\u1E6F\u1E71\u1E73\u1E75\u1E77\u1E79\u1E7B\u1E7D\u1E7F\u1E81\u1E83\u1E85\u1E87\u1E89\u1E8B\u1E8D\u1E8F\u1E91\u1E93\u1E95-\u1E9D\u1E9F\u1EA1\u1EA3\u1EA5\u1EA7\u1EA9\u1EAB\u1EAD\u1EAF\u1EB1\u1EB3\u1EB5\u1EB7\u1EB9\u1EBB\u1EBD\u1EBF\u1EC1\u1EC3\u1EC5\u1EC7\u1EC9\u1ECB\u1ECD\u1ECF\u1ED1\u1ED3\u1ED5\u1ED7\u1ED9\u1EDB\u1EDD\u1EDF\u1EE1\u1EE3\u1EE5\u1EE7\u1EE9\u1EEB\u1EED\u1EEF\u1EF1\u1EF3\u1EF5\u1EF7\u1EF9\u1EFB\u1EFD\u1EFF-\u1F07\u1F10-\u1F15\u1F20-\u1F27\u1F30-\u1F37\u1F40-\u1F45\u1F50-\u1F57\u1F60-\u1F67\u1F70-\u1F7D\u1F80-\u1F87\u1F90-\u1F97\u1FA0-\u1FA7\u1FB0-\u1FB4\u1FB6-\u1FB7\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FC7\u1FD0-\u1FD3\u1FD6-\u1FD7\u1FE0-\u1FE7\u1FF2-\u1FF4\u1FF6-\u1FF7\u210A\u210E-\u210F\u2113\u212F\u2134\u2139\u213C-\u213D\u2146-\u2149\u214E\u2184\u2C30-\u2C5E\u2C61\u2C65-\u2C66\u2C68\u2C6A\u2C6C\u2C71\u2C73-\u2C74\u2C76-\u2C7B\u2C81\u2C83\u2C85\u2C87\u2C89\u2C8B\u2C8D\u2C8F\u2C91\u2C93\u2C95\u2C97\u2C99\u2C9B\u2C9D\u2C9F\u2CA1\u2CA3\u2CA5\u2CA7\u2CA9\u2CAB\u2CAD\u2CAF\u2CB1\u2CB3\u2CB5\u2CB7\u2CB9\u2CBB\u2CBD\u2CBF\u2CC1\u2CC3\u2CC5\u2CC7\u2CC9\u2CCB\u2CCD\u2CCF\u2CD1\u2CD3\u2CD5\u2CD7\u2CD9\u2CDB\u2CDD\u2CDF\u2CE1\u2CE3-\u2CE4\u2CEC\u2CEE\u2CF3\u2D00-\u2D25\u2D27\u2D2D\uA641\uA643\uA645\uA647\uA649\uA64B\uA64D\uA64F\uA651\uA653\uA655\uA657\uA659\uA65B\uA65D\uA65F\uA661\uA663\uA665\uA667\uA669\uA66B\uA66D\uA681\uA683\uA685\uA687\uA689\uA68B\uA68D\uA68F\uA691\uA693\uA695\uA697\uA699\uA69B\uA723\uA725\uA727\uA729\uA72B\uA72D\uA72F-\uA731\uA733\uA735\uA737\uA739\uA73B\uA73D\uA73F\uA741\uA743\uA745\uA747\uA749\uA74B\uA74D\uA74F\uA751\uA753\uA755\uA757\uA759\uA75B\uA75D\uA75F\uA761\uA763\uA765\uA767\uA769\uA76B\uA76D\uA76F\uA771-\uA778\uA77A\uA77C\uA77F\uA781\uA783\uA785\uA787\uA78C\uA78E\uA791\uA793-\uA795\uA797\uA799\uA79B\uA79D\uA79F\uA7A1\uA7A3\uA7A5\uA7A7\uA7A9\uA7AF\uA7B5\uA7B7\uA7B9\uA7BB\uA7BD\uA7BF\uA7C3\uA7FA\uAB30-\uAB5A\uAB60-\uAB67\uAB70-\uABBF\uFB00-\uFB06\uFB13-\uFB17\uFF41-\uFF5A]|(?:\uD801[\uDC28-\uDC4F\uDCD8-\uDCFB]|\uD803[\uDCC0-\uDCF2]|\uD806[\uDCC0-\uDCDF]|\uD81B[\uDE60-\uDE7F]|\uD835[\uDC1A-\uDC33\uDC4E-\uDC54\uDC56-\uDC67\uDC82-\uDC9B\uDCB6-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDCCF\uDCEA-\uDD03\uDD1E-\uDD37\uDD52-\uDD6B\uDD86-\uDD9F\uDDBA-\uDDD3\uDDEE-\uDE07\uDE22-\uDE3B\uDE56-\uDE6F\uDE8A-\uDEA5\uDEC2-\uDEDA\uDEDC-\uDEE1\uDEFC-\uDF14\uDF16-\uDF1B\uDF36-\uDF4E\uDF50-\uDF55\uDF70-\uDF88\uDF8A-\uDF8F\uDFAA-\uDFC2\uDFC4-\uDFC9\uDFCB]|\uD83A[\uDD22-\uDD43]))

Note that a regex implementation of \p{Lu} or \p{Pl} actually calls a
non standard function to test the value.

The character classes shown here are done differently and are linear, standard
and pretty slow, when jammed into mostly a single class.

Some insight on how a Regex engine (in general) implements Unicode Property Classes:

Examine these performance characteristics between the property
and the class block (like above)

Regex1:  LONG CLASS 
< none >
Completed iterations:   50  /  50     ( x 1 )
Matches found per iteration:   1788
Elapsed Time:    0.73 s,   727.58 ms,   727584 µs
Matches per sec:   122,872


Regex2:   \p{Lu}
Options:  < ICU - none >
Completed iterations:   50  /  50     ( x 1 )
Matches found per iteration:   1788
Elapsed Time:    0.07 s,   65.32 ms,   65323 µs
Matches per sec:   1,368,583

Wow what a difference !!

Lets see how Properties might be implemented

Array of Pointers [ 10FFFF ] where each index is is a Code Point

Each pointer in the Array is to a structure of classification.
- A Classification structure contains fixed field elemets.
  Some are NULL and do not pertain.
  Some contain category classifications.
  
  Example : General Category
  This is a bitmapped element that uses 17 out of 64 bits.
  Whatever this Code Point supports has bit(s) set as a mask.
  
  -Close_Punctuation
  -Connector_Punctuation
  -Control
  -Currency_Symbol
  -Dash_Punctuation
  -Decimal_Number
  -Enclosing_Mark
  -Final_Punctuation
  -Format
  -Initial_Punctuation
  -Letter_Number
  -Line_Separator
  -Lowercase_Letter
  -Math_Symbol
  -Modifier_Letter
  -Modifier_Symbol
  -Nonspacing_Mark
  -Open_Punctuation
  -Other_Letter
  -Other_Number
  -Other_Punctuation
  -Other_Symbol
  -Paragraph_Separator
  -Private_Use
  -Space_Separator
  -Spacing_Mark
  -Surrogate
  -Titlecase_Letter
  -Unassigned
  -Uppercase_Letter

When a regex is parsed with something like this \p{Lu} it
is translated directly into

Classification Structure element offset : General Category
A check of that element for bit item : Uppercase_Letter

Another example, when a regex is parsed with punctuation property \p{P} it
is translated into

Classification Structure element offset : General Category
A check of that element for any of these items bits, which are joined into a mask :

-Close_Punctuation
-Connector_Punctuation
-Dash_Punctuation
-Final_Punctuation
-Initial_Punctuation
-Open_Punctuation
-Other_Punctuation

The offset and bit or bit(mask) are stored as a regex step for that property.

The lookup table is created once for all Unicode Code Points using this array.

When a character is checked, it is as simple as using the CP as an index into this array and checking the Classification Structure's specific element for that bit(mask).

This structure is expandable and indirect to provide much more complex look ups. This is just a simple example.

Compare that direct lookup with a character class search :

All classes are a linear list of items searched from left to right.
In this comparison, given our target string contains only the complete Upper Case Unicode Letters only, the law of averages would predict that half of the items in the class would have to be ranged checked to find a match.

This is a huge disadvantage in performance.

However, if the lookup tables are not there or are not up to date with the latest Unicode release (12 as of this date)
then this would be the only way.

In fact, it is mostly the only way to get the complete Emoji
characters as there is no specific property (or reasoning) to their assignment.

GET and POST methods with the same Action name in the same Controller

I like to accept a form post for my POST actions, even if I don't need it. For me it just feels like the right thing to do as you're supposedly posting something.

public class HomeController : Controller
{
    public ActionResult Index()
    {
        //Code...
        return View();
    }

    [HttpPost]
    public ActionResult Index(FormCollection form)
    {
        //Code...
        return View();
    }
}

Command to get time in milliseconds

On OS X, where date does not support the %N flag, I recommend installing coreutils using Homebrew. This will give you access to a command called gdate that will behave as date does on Linux systems.

brew install coreutils

For a more "native" experience, you can always add this to your .bash_aliases:

alias date='gdate'

Then execute

$ date +%s%N

Fire event on enter key press for a textbox

<input type="text" id="txtCode" name="name" class="text_cs">

and js:

<script type="text/javascript">
$('.text_cs').on('change', function () {
var pid = $(this).val();
console.log("Value text: " + pid);
});
</script>

Cannot find libcrypto in Ubuntu

ld is trying to find libcrypto.sowhich is not present as seen in your locate output. You can make a copy of the libcrypto.so.0.9.8 and name it as libcrypto.so. Put this is your ld path. ( If you do not have root access then you can put it in a local path and specify the path manually )

MongoDB: How to find out if an array field contains an element?

It seems like the $in operator would serve your purposes just fine.

You could do something like this (pseudo-query):

if (db.courses.find({"students" : {"$in" : [studentId]}, "course" : courseId }).count() > 0) {
  // student is enrolled in class
}

Alternatively, you could remove the "course" : courseId clause and get back a set of all classes the student is enrolled in.

Creating hard and soft links using PowerShell

Try junction.exe

The Junction command line utility from SysInternals makes creating and deleting junctions easy.

`tig`

If you want a interactive tree, you can use tig. It can be installed by brew on OSX and apt-get in Linux.

brew install tig
tig

This is what you get:

enter image description here

changing textbox border colour using javascript

I'm agree with Vicente Plata you should try using jQuery IMHO is the best javascript library. You can create a class in your CSS file and just do the following with jquery:

$('#fName').addClass('name_of_the_class');

and that's all, and of course you won't be worried about incompatibility of the browsers, that's jquery's team problem :D LOL

Back to previous page with header( "Location: " ); in PHP

Just try this in Javascript:

 $previous = "javascript:history.go(-1)";

Or you can try it in PHP:

if(isset($_SERVER['HTTP_REFERER'])) {
    $previous = $_SERVER['HTTP_REFERER'];
}

Postgresql : syntax error at or near "-"

Wrap it in double quotes

alter user "dell-sys" with password 'Pass@133';

Notice that you will have to use the same case you used when you created the user using double quotes. Say you created "Dell-Sys" then you will have to issue exact the same whenever you refer to that user.

I think the best you do is to drop that user and recreate without illegal identifier characters and without double quotes so you can later refer to it in any case you want.

What is the shortcut to Auto import all in Android Studio?

On Windows, highlight the code that has classes which need to be resolved and hit Alt+Enter

Text border using css (border around text)

Use multiple text shadows:

text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;

enter image description here

_x000D_

body {_x000D_
  font-family: sans-serif;_x000D_
  background: #222;_x000D_
  color: darkred;_x000D_
  }_x000D_
h1 {_x000D_
  text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;_x000D_
}

_x000D_

<h1>test</h1>

_x000D_

Alternatively, you could use text stroke, which only works in webkit:

-webkit-text-stroke-width: 2px;
-webkit-text-stroke-color: #fff;

enter image description here

_x000D_

body {_x000D_
  font-family: sans-serif;_x000D_
  background: #222;_x000D_
  color: darkred;_x000D_
  }_x000D_
h1 {_x000D_
  -webkit-text-stroke-width: 2px;_x000D_
-webkit-text-stroke-color: #fff;_x000D_
}

_x000D_

<h1>test</h1>

_x000D_

Spring Boot application as a Service

The following works for springboot 1.3 and above:

As init.d service

The executable jar has the usual start, stop, restart, and status commands. It will also set up a PID file in the usual /var/run directory and logging in the usual /var/log directory by default.

You just need to symlink your jar into /etc/init.d like so

sudo link -s /var/myapp/myapp.jar /etc/init.d/myapp

sudo ln -s ~/myproject/build/libs/myapp-1.0.jar /etc/init.d/myapp_servicename

After that you can do the usual

/etc/init.d/myapp start

Then setup a link in whichever runlevel you want the app to start/stop in on boot if so desired.

As a systemd service

To run a Spring Boot application installed in var/myapp you can add the following script in /etc/systemd/system/myapp.service:

[Unit]
Description=myapp
After=syslog.target

[Service]
ExecStart=/var/myapp/myapp.jar

[Install]
WantedBy=multi-user.target

NB: in case you are using this method, do not forget to make the jar file itself executable (with chmod +x) otherwise it will fail with error "Permission denied".

Reference

http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/html/deployment-install.html#deployment-service

Check if a variable is null in plsql

Always remember to be careful with nulls in pl/sql conditional clauses as null is never greater, smaller, equal or unequal to anything. Best way to avoid them is to use nvl.

For example

declare
  i integer;
begin
  if i <> 1 then
    i:=1;
    foobar();
  end if;
end;
/

Never goes inside the if clause.

These would work.

if 1<>nvl(i,1) then
if i<> 1 or i is null then

Image encryption/decryption using AES256 symmetric block ciphers

If you are encrypting a text file, then the following test/sample may be useful. It does the following:

Create a byte stream,
wraps that with AES encryption,
wrap it next with text processing

and lastly buffers it

// AESdemo

public class AESdemo extends Activity {
    boolean encryptionIsOn = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_aesdemo);
        // needs <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
        String homeDirName = Environment.getExternalStorageDirectory().getAbsolutePath() +
                "/" + getPackageName();
        File file = new File(homeDirName, "test.txt");
        byte[] keyBytes = getKey("password");

        try {
            File dir = new File(homeDirName);
            if (!dir.exists())
                dir.mkdirs();
            if (!file.exists())
                file.createNewFile();

            OutputStreamWriter osw;

            if (encryptionIsOn) {
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES");
                IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes);
                cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);

                FileOutputStream fos = new FileOutputStream(file);
                CipherOutputStream cos = new CipherOutputStream(fos, cipher);
                osw = new OutputStreamWriter(cos, "UTF-8");
            }
            else    // not encryptionIsOn
                osw = new FileWriter(file);

            BufferedWriter out = new BufferedWriter(osw);
            out.write("This is a test\n");
            out.close();
        }
        catch (Exception e) {
            System.out.println("Encryption Exception "+e);
        }

        ///////////////////////////////////
        try {
            InputStreamReader isr;

            if (encryptionIsOn) {
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES");
                IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes);
                cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);

                FileInputStream fis = new FileInputStream(file);
                CipherInputStream cis = new CipherInputStream(fis, cipher);
                isr = new InputStreamReader(cis, "UTF-8");
            }
            else
                isr = new FileReader(file);

            BufferedReader in = new BufferedReader(isr);
            String line = in.readLine();
            System.out.println("Text read: <"+line+">");
            in.close();
        }
        catch (Exception e) {
            System.out.println("Decryption Exception "+e);
        }
    }

    private byte[] getKey(String password) throws UnsupportedEncodingException {
        String key = "";
        while (key.length() < 16)
            key += password;
        return key.substring(0, 16).getBytes("UTF-8");
    }
}

Efficient SQL test query or validation query that will work across all (or most) databases

If your driver is JDBC 4 compliant, there is no need for a dedicated query to test connections. Instead, there is Connection.isValid to test the connection.

JDBC 4 is part of Java 6 from 2006 and you driver should support this by now!

Famous connection pools, like HikariCP, still have a config parameter for specifying a test query but strongly discourage to use it:

connectionTestQuery

If your driver supports JDBC4 we strongly recommend not setting this property. This is for "legacy" databases that do not support the JDBC4 Connection.isValid() API. This is the query that will be executed just before a connection is given to you from the pool to validate that the connection to the database is still alive. Again, try running the pool without this property, HikariCP will log an error if your driver is not JDBC4 compliant to let you know. Default: none

Accessing Objects in JSON Array (JavaScript)

Use a loop

for(var i = 0; i < obj.length; ++i){
   //do something with obj[i]
   for(var ind in obj[i]) {
        console.log(ind);
        for(var vals in obj[i][ind]){
            console.log(vals, obj[i][ind][vals]);
        }
   }
}

Demo: http://jsfiddle.net/maniator/pngmL/

Difference between two dates in Python

Use - to get the difference between two datetime objects and take the days member.

from datetime import datetime

def days_between(d1, d2):
    d1 = datetime.strptime(d1, "%Y-%m-%d")
    d2 = datetime.strptime(d2, "%Y-%m-%d")
    return abs((d2 - d1).days)

append to url and refresh page

function gotoItem( item ){
    var url = window.location.href;
    var separator = (url.indexOf('?') > -1) ? "&" : "?";
    var qs = "item=" + encodeURIComponent(item);
    window.location.href = url + separator + qs;
}

More compat version

function gotoItem( item ){
    var url = window.location.href;    
    url += (url.indexOf('?') > -1)?"&":"?" + "item=" + encodeURIComponent(item);
    window.location.href = url;
}

Bringing a subview to be in front of all other views

In c#, View.BringSubviewToFront(childView); YourView.Layer.ZPosition = 1; both should work.

Creating a Custom Event

Yes you can create events on objects, here is an example;

public class Foo
{
    public delegate void MyEvent(object sender, object param);
    event MyEvent OnMyEvent;

    public Foo()
    {
        this.OnMyEvent += new MyEvent(Foo_OnMyEvent);
    }

    void Foo_OnMyEvent(object sender, object param)
    {
        if (this.OnMyEvent != null)
        {
            //do something
        }
    }



    void RaiseEvent()
    {
        object param = new object();
        this.OnMyEvent(this,param);
    }
}

Sort an array of objects in React and render them

this.state.data.sort((a, b) => a.item.timeM > b.item.timeM).map(
    (item, i) => <div key={i}> {item.matchID} {item.timeM} {item.description}</div>
)

Swift double to string

There are many answers here that suggest a variety of techniques. But when presenting numbers in the UI, you invariably want to use a NumberFormatter so that the results are properly formatted, rounded, and localized:

let value = 10000.5

let formatter = NumberFormatter()
formatter.numberStyle = .decimal

guard let string = formatter.string(for: value) else { return }
print(string) // 10,000.5

If you want fixed number of decimal places, e.g. for currency values

let value = 10000.5

let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.maximumFractionDigits = 2
formatter.minimumFractionDigits = 2

guard let string = formatter.string(for: value) else { return }
print(string) // 10,000.50

But the beauty of this approach, is that it will be properly localized, resulting in 10,000.50 in the US but 10.000,50 in Germany. Different locales have different preferred formats for numbers, and we should let NumberFormatter use the format preferred by the end user when presenting numeric values within the UI.

Needless to say, while NumberFormatter is essential when preparing string representations within the UI, it should not be used if writing numeric values as strings for persistent storage, interface with web services, etc.

Import Python Script Into Another?

Following worked for me and it seems very simple as well:

Let's assume that we want to import a script ./data/get_my_file.py and want to access get_set1() function in it.

import sys
sys.path.insert(0, './data/')
import get_my_file as db

print (db.get_set1())

Send POST request using NSURLSession

If you are using Swift, the Just library does this for you. Example from it's readme file:

//  talk to registration end point
Just.post(
    "http://justiceleauge.org/member/register",
    data: ["username": "barryallen", "password":"ReverseF1ashSucks"],
    files: ["profile_photo": .URL(fileURLWithPath:"flash.jpeg", nil)]
) { (r)
    if (r.ok) { /* success! */ }
}

jQuery bind/unbind 'scroll' event on $(window)

try this:

$(window).unbind('scroll');

it works in my project

Ruby max integer

as @Jörg W Mittag pointed out: in jruby, fix num size is always 8 bytes long. This code snippet shows the truth:

fmax = ->{
  if RUBY_PLATFORM == 'java'
    2**63 - 1
  else
    2**(0.size * 8 - 2) - 1
  end
}.call

p fmax.class     # Fixnum

fmax = fmax + 1  

p fmax.class     #Bignum

Why does comparing strings using either '==' or 'is' sometimes produce a different result?

is is identity testing, == is equality testing. what happens in your code would be emulated in the interpreter like this:

>>> a = 'pub'
>>> b = ''.join(['p', 'u', 'b'])
>>> a == b
True
>>> a is b
False

so, no wonder they're not the same, right?

In other words: a is b is the equivalent of id(a) == id(b)

How to make button fill table cell

For starters:

<p align='center'>
<table width='100%'>
<tr>
<td align='center'><form><input type=submit value="click me" style="width:100%"></form></td>
</tr>
</table>
</p>

Note, if the width of the input button is 100%, you wont need the attribute "align='center'" anymore.

This would be the optimal solution:

<p align='center'>
<table width='100%'>
<tr>
<td><form><input type=submit value="click me" style="width:100%"></form></td>
</tr>
</table>
</p>

C++ - Hold the console window open?

As Thomas says, the cin ignore is a good way. To always wait for user to press enter (even if exit is used), register a function atexit:

#include <iostream>

void pause()
{   ::std::cout<<"\nPress ENTER to exit.";
    ::std::cin.sync();
    if(::std::cin.get()!='\n')
        ::std::cin.ignore(0xFFFFFFFF,'\n');
}

int main()
{
    atexit(pause);

    // whatever

    return 0;
}

Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)

FWIW, Microsoft Visual C++ does support try,finally and it has historically been used in MFC apps as a method of catching serious exceptions that would otherwise result in a crash. For example;

int CMyApp::Run() 
{
    __try
    {
        int i = CWinApp::Run();
        m_Exitok = MAGIC_EXIT_NO;
        return i;
    }
    __finally
    {
        if (m_Exitok != MAGIC_EXIT_NO)
            FaultHandler();
    }
}

I've used this in the past to do things like save backups of open files prior to exit. Certain JIT debugging settings will break this mechanism though.

Convert String to java.util.Date

It sounds like you may want to use something like SimpleDateFormat. http://java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html

You declare your date format and then call the parse method with your string.

private static final DateFormat DF = new SimpleDateFormat(...);
Date myDate = DF.parse("1234");

And as Guillaume says, set the timezone!

Android-java- How to sort a list of objects by a certain value within the object

I have a listview which shows the Information about the all clients I am sorting the clients name using this custom comparator class. They are having some extra lerret apart from english letters which i am managing with this setStrength(Collator.SECONDARY)

 public class CustomNameComparator implements Comparator<ClientInfo> {
        @Override

    public int compare(ClientInfo o1, ClientInfo o2) { 

        Locale locale=Locale.getDefault();
        Collator collator = Collator.getInstance(locale);
        collator.setStrength(Collator.SECONDARY);
        return collator.compare(o1.title, o2.title);

    }
}


PRIMARY strength: Typically, this is used to denote differences between base characters (for example, "a" < "b"). It is the strongest difference. For example, dictionaries are divided into different sections by base character. 
SECONDARY strength: Accents in the characters are considered secondary differences (for example, "as" < "às" < "at"). Other differences between letters can also be considered secondary differences, depending on the language. A secondary difference is ignored when there is a primary difference anywhere in the strings. 
TERTIARY strength: Upper and lower case differences in characters are distinguished at tertiary strength (for example, "ao" < "Ao" < "aò"). In addition, a variant of a letter differs from the base form on the tertiary strength (such as "A" and "?"). Another example is the difference between large and small Kana. A tertiary difference is ignored when there is a primary or secondary difference anywhere in the strings. 
IDENTICAL strength: When all other strengths are equal, the IDENTICAL strength is used as a tiebreaker. The Unicode code point values of the NFD form of each string are compared, just in case there is no difference. For example, Hebrew cantellation marks are only distinguished at this strength. This strength should be used sparingly, as only code point value differences between two strings are an extremely rare occurrence. Using this strength substantially decreases the performance for both comparison and collation key generation APIs. This strength also increases the size of the collation key. 

**Here is a another way to make a rule base sorting if u need it just sharing**

/*      String rules="< å,Å< ä,Ä< a,A< b,B< c,C< d,D< é< e,E< f,F< g,G< h,H< ï< i,I"+"< j,J< k,K< l,L< m,M< n,N< ö,Ö< o,O< p,P< q,Q< r,R"+"< s,S< t,T< ü< u,U< v,V< w,W< x,X< y,Y< z,Z";
        RuleBasedCollator rbc = null;
        try {
            rbc = new RuleBasedCollator(rules);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String myTitles[]={o1.title,o2.title};
        Collections.sort(Arrays.asList(myTitles), rbc);*/

Count the number of occurrences of a character in a string in Javascript

let str = "aabgrhaab"
let charMap = {}

for(let char of text) {
   if(charMap.hasOwnProperty(char)){
      charMap[char]++
   } else {
     charMap[char] = 1
   }
}

console.log(charMap); //{a: 4, b: 2, g: 1, r: 1, h: 1}

jQuery: Wait/Delay 1 second without executing code

delay() doesn't halt the flow of code then re-run it. There's no practical way to do that in JavaScript. Everything has to be done with functions which take callbacks such as setTimeout which others have mentioned.

The purpose of jQuery's delay() is to make an animation queue wait before executing. So for example $(element).delay(3000).fadeIn(250); will make the element fade in after 3 seconds.

sh: 0: getcwd() failed: No such file or directory on cited drive

Try the following command, it worked for me.

cd; cd -

Create a new cmd.exe window from within another cmd.exe prompt

start cmd.exe

opens a separate window

start file.cmd

opens the batch file and executes it in another command prompt

Query Mongodb on month, day, year... of a datetime

Dates are stored in their timestamp format. If you want everything that belongs to a specific month, query for the start and the end of the month.

var start = new Date(2010, 11, 1);
var end = new Date(2010, 11, 30);

db.posts.find({created_on: {$gte: start, $lt: end}});
//taken from http://cookbook.mongodb.org/patterns/date_range/

How to horizontally center an element

CSS justify-content property

It aligns the Flexbox items at the center of the container:

#outer {
    display: flex;
    justify-content: center;
}

Using json_encode on objects in PHP (regardless of scope)

I didn't see this mentioned yet, but beans have a built-in method called getProperties().

So, to use it:

// What bean do we want to get?
$type = 'book';
$id = 13;

// Load the bean
$post = R::load($type,$id);

// Get the properties
$props = $post->getProperties();

// Print the JSON-encoded value
print json_encode($props);

This outputs:

{
    "id": "13",
    "title": "Oliver Twist",
    "author": "Charles Dickens"
}

Now take it a step further. If we have an array of beans...

// An array of beans (just an example)
$series = array($post,$post,$post);

...then we could do the following:

Loop through the array with a foreach loop.
Replace each element (a bean) with an array of the bean's properties.

So this...

foreach ($series as &$val) {
  $val = $val->getProperties();
}

print json_encode($series);

...outputs this:

[
    {
        "id": "13",
        "title": "Oliver Twist",
        "author": "Charles Dickens"
    },
    {
        "id": "13",
        "title": "Oliver Twist",
        "author": "Charles Dickens"
    },
    {
        "id": "13",
        "title": "Oliver Twist",
        "author": "Charles Dickens"
    }
]

Hope this helps!

Log4net does not write the log in the log file

For me I had to move Logger to a Nuget Package. Below code need to be added in NuGet package project.

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config")]

See https://gurunadhduvvuru.wordpress.com/2020/04/30/log4net-issues-when-moved-it-to-a-nuget-package/ for more details.

Java: get greatest common divisor

The % going to give us the gcd Between two numbers, it means:- % or mod of big_number/small_number are =gcd, and we write it on java like this big_number % small_number.

EX1: for two integers

  public static int gcd(int x1,int x2)
    {
        if(x1>x2)
        {
           if(x2!=0)
           {
               if(x1%x2==0)     
                   return x2;
                   return x1%x2;
                   }
           return x1;
           }
          else if(x1!=0)
          {
              if(x2%x1==0)
                  return x1;
                  return x2%x1;
                  }
        return x2;
        }

EX2: for three integers

public static int gcd(int x1,int x2,int x3)
{

    int m,t;
    if(x1>x2)
        t=x1;
    t=x2;
    if(t>x3)
        m=t;
    m=x3;
    for(int i=m;i>=1;i--)
    {
        if(x1%i==0 && x2%i==0 && x3%i==0)
        {
            return i;
        }
    }
    return 1;
}

No value accessor for form control with name: 'recipient'

Make sure you import MaterialModule as well since you are using md-input which does not belong to FormsModule

What does "exec sp_reset_connection" mean in Sql Server Profiler?

It's an indication that connection pooling is being used (which is a good thing).

How to change btn color in Bootstrap

You have missed one style ".btn-primary:active:focus" which causes that still during btn click default bootstrap color show up for a second. This works in my code:

.btn-primary, .btn-primary:hover, .btn-primary:active, .btn-primary:visited, .btn-primary:focus, .btn-primary:active:focus {
background-color: #8064A2;}

Make JQuery UI Dialog automatically grow or shrink to fit its contents

This works with jQuery UI v1.10.3

$("selector").dialog({height:'auto', width:'auto'});

split string only on first instance of specified character

This worked for me on Chrome + FF:

"foo=bar=beer".split(/^[^=]+=/)[1] // "bar=beer"
"foo==".split(/^[^=]+=/)[1] // "="
"foo=".split(/^[^=]+=/)[1] // ""
"foo".split(/^[^=]+=/)[1] // undefined

If you also need the key try this:

"foo=bar=beer".split(/^([^=]+)=/) // Array [ "", "foo", "bar=beer" ]
"foo==".split(/^([^=]+)=/) // [ "", "foo", "=" ]
"foo=".split(/^([^=]+)=/) // [ "", "foo", "" ]
"foo".split(/^([^=]+)=/) // [ "foo" ]

//[0] = ignored (holds the string when there's no =, empty otherwise)
//[1] = hold the key (if any)
//[2] = hold the value (if any)

Cannot deserialize the current JSON array (e.g. [1,2,3])

You can use this to solve your problem:

private async void btn_Go_Click(object sender, RoutedEventArgs e)
{
    HttpClient webClient = new HttpClient();
    Uri uri = new Uri("http://www.school-link.net/webservice/get_student/?id=" + txtVCode.Text);
    HttpResponseMessage response = await webClient.GetAsync(uri);
    var jsonString = await response.Content.ReadAsStringAsync();
    var _Data = JsonConvert.DeserializeObject <List<Student>>(jsonString);
    foreach (Student Student in _Data)
    {
        tb1.Text = Student.student_name;
    }
}

uncaught syntaxerror unexpected token U JSON

This answer can be a possible solution from many. This answer is for the people who are facing this error while working with File Upload..

We were using middleware for token based encryption - decryption and we encountered same error.

Following was our code in route file:

  router.route("/uploadVideoMessage")
  .post(
    middleware.checkToken,
    upload.single("video_file"),
    videoMessageController.uploadVideoMessage
  );

here we were calling middleware before upload function and that was causing the error. So when we changed it to this, it worked.

router.route("/uploadVideoMessage")
  .post(
    upload.single("video_file"),
    middleware.checkToken,
    videoMessageController.uploadVideoMessage
  );

Google Play Services Missing in Emulator (Android 4.4.2)

google play service is just a library to create application but in order to use application that use google play service library , you need to install google play in your emulator.and for that it need the unique device id. and device id is only on the real device not have on emulator. so for testing it , you need real android device.

Flexbox: 4 items per row

I believe this example is more barebones and easier to understand then @dowomenfart.

.child {
    display: inline-block;
    margin: 0 1em;
    flex-grow: 1;
    width: calc(25% - 2em);
}

This accomplishes the same width calculations while cutting straight to the meat. The math is way easier and em is the new standard due to its scalability and mobile-friendliness.

PHP array printing using a loop

I also find that using <pre></pre> tags around your var_dump or print_r results in a much more readable dump.

How to use null in switch

Based on @tetsuo answer, with java 8 :

Integer i = ...

switch (Optional.ofNullable(i).orElse(DEFAULT_VALUE)) {
    case DEFAULT_VALUE:
        doDefault();
        break;    
}

How to remove a TFS Workspace Mapping?

Following are the steps to remove mapping of a project from TFS:

(1) Click on View Button.

(2) Open Team Explorer

(3) Click on Source Control

(4) Right click on your project/Directory

(5) Click on Remove Mapping

(6) Finally Delete the Project form local directory.

Is there a way to access the "previous row" value in a SELECT statement?

Use the lag function:

SELECT value - lag(value) OVER (ORDER BY Id) FROM table

Sequences used for Ids can skip values, so Id-1 does not always work.

Changing Node.js listening port

There is no config file unless you create one yourself. However, the port is a parameter of the listen() function. For example, to listen on port 8124:

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(8124, "127.0.0.1");
console.log('Server running at http://127.0.0.1:8124/');

If you're having problems finding a port that's open, you can go to the command line and type:

netstat -ano

To see a list of all ports in use per adapter.

Programs & Examples On #Cprofile

Use C# HttpWebRequest to send json to web service

Python readlines() usage and efficient practice for reading

Xcode Product -> Archive disabled

how to set radio button checked in edit mode in MVC razor view

How to specify more spaces for the delimiter using cut?

Configuration Error: <compilation debug="true" targetFramework="4.0"> ASP.NET MVC3

How to upload images into MySQL database using PHP code

How can I programmatically freeze the top row of an Excel worksheet in Excel 2007 VBA?

Split function in oracle to comma separated values with automatic sequence

Groovy - Convert object to JSON string

What is the best way to filter a Java Collection?

Can't get ScriptManager.RegisterStartupScript in WebControl nested in UpdatePanel to work

How to center an unordered list?

how to add lines to existing file using python

How can I search (case-insensitive) in a column using LIKE wildcard?

How exactly does the android:onClick XML attribute differ from setOnClickListener?

Reading images in python

Java - Reading XML file

Using an Alias in a WHERE clause

Inserting Data into Hive Table

Send JSON data via POST (ajax) and receive json response from Controller (MVC)

Create a model

Controllers Like Below

Javascript

Table-level backup

Move existing, uncommitted work to a new branch in Git

How to align this span to the right of the div?

element not interactable exception in selenium web automation

Java and SQLite

How to register multiple servlets in web.xml in one Spring application

Removing carriage return and new-line from the end of a string in c#

Is it possible to install iOS 6 SDK on Xcode 5?

runOnUiThread in fragment

C# - Insert a variable number of spaces into a string? (Formatting an output file)

Add a tooltip to a div

How to catch an Exception from a thread

100% height minus header?

Cannot find either column "dbo" or the user-defined function or aggregate "dbo.Splitfn", or the name is ambiguous

Firebase FCM notifications click_action payload

How to match, but not capture, part of a regex?

Reading a file character by character in C

How can you use php in a javascript function

Activate a virtualenv with a Python script

Add image to left of text via css

Remove CSS "top" and "left" attributes with jQuery

Shell script to set environment variables

Dynamic classname inside ngClass in angular 2

Difference between fprintf, printf and sprintf?

Swift Modal View Controller with transparent background

Jquery Chosen plugin - dynamically populate list by Ajax

Inline elements shifting when made bold on hover

How to format DateTime to 24 hours time?

Pass variable to function in jquery AJAX success callback

VBA: Conditional - Is Nothing

Fill background color left to right CSS

jquery how to use multiple ajax calls one after the end of the other

What is the runtime performance cost of a Docker container?

REST API Login Pattern

How do I create a new column from the output of pandas groupby().sum()?

How do I create a new column with Groupby().Sum()?

Everybody's Favorite: GroupBy.transform() with 'sum'

Unconventional, but Worth your Consideration: GroupBy.sum() + Series.map()

How to Change Margin of TextView

ImportError: No module named xlsxwriter

Access denied for user 'root'@'localhost' with PHPMyAdmin

How to send a header using a HTTP request through a curl call?

How to dynamically change header based on AngularJS partial view?

How to put space character into a string name in XML?

How to set a Header field on POST a form?

select dept names who have more than 2 employees whose salary is greater than 1000

MySQL select where column is not empty

Check existence of directory and create if doesn't exist

Caching a jquery ajax response in javascript/browser

How do I parse JSON from a Java HTTPResponse?

CSS3 Box Shadow on Top, Left, and Right Only

Pass accepts header parameter to jquery ajax

How can I refresh a page with jQuery?

Posting JSON data via jQuery to ASP .NET MVC 4 controller action

Java: How to check if object is null?

Everybody's Favorite: `GroupBy.transform()` with `'sum'`

Unconventional, but Worth your Consideration: `GroupBy.sum()` + `Series.map()`