Programs & Examples On #Msxml6

Java: splitting a comma-separated string but ignoring commas in quotes

You're in that annoying boundary area where regexps almost won't do (as has been pointed out by Bart, escaping the quotes would make life hard) , and yet a full-blown parser seems like overkill.

If you are likely to need greater complexity any time soon I would go looking for a parser library. For example this one

Android, How to read QR code in my application?

try {

    Intent intent = new Intent("com.google.zxing.client.android.SCAN");
    intent.putExtra("SCAN_MODE", "QR_CODE_MODE"); // "PRODUCT_MODE for bar codes

    startActivityForResult(intent, 0);

} catch (Exception e) {

    Uri marketUri = Uri.parse("market://details?id=com.google.zxing.client.android");
    Intent marketIntent = new Intent(Intent.ACTION_VIEW,marketUri);
    startActivity(marketIntent);

}

and in onActivityResult():

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {           
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 0) {

        if (resultCode == RESULT_OK) {
            String contents = data.getStringExtra("SCAN_RESULT");
        }
        if(resultCode == RESULT_CANCELED){
            //handle cancel
        }
    }
}

What are projection and selection?

Exactly.

Projection means choosing which columns (or expressions) the query shall return.

Selection means which rows are to be returned.

if the query is

select a, b, c from foobar where x=3;

then "a, b, c" is the projection part, "where x=3" the selection part.

How to drop columns by name in a data frame

df = mtcars 
remove vs and am because they are categorical. In the dataset vs is in column number 8, am is in column number 9

dfnum = df[,-c(8,9)]

How do you format code in Visual Studio Code (VSCode)

Not this one. Use this:

Menu FilePreferencesWorkspace Settings, "editor.formatOnType": true

get value from DataTable

You can try changing it to this:

If myTableData.Rows.Count > 0 Then
  For i As Integer = 0 To myTableData.Rows.Count - 1
    ''Dim DataType() As String = myTableData.Rows(i).Item(1)
    ListBox2.Items.Add(myTableData.Rows(i)(1))
  Next
End If

Note: Your loop needs to be one less than the row count since it's a zero-based index.

How to read values from properties file?

I'll recommend reading this link https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html from SpringBoot docs about injecting external configs. They didn't only talk about retrieving from a properties file but also YAML and even JSON files. I found it helpful. I hope you do too.

How to set text size of textview dynamically for different screens

You should use the resource folders such as

values-ldpi
values-mdpi
values-hdpi

And write the text size in 'dimensions.xml' file for each range.

And in the java code you can set the text size with

textView.setTextSize(getResources().getDimension(R.dimen.textsize));

Sample dimensions.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="textsize">15sp</dimen>
</resources>

Remote JMX connection

Had it been on Linux the problem would be that localhost is the loopback interface, you need to application to bind to your network interface.

You can use the netstat to confirm that it is not bound to the expected network interface.

You can make this work by invoking the program with the system parameter java.rmi.server.hostname="YOUR_IP", either as an environment variable or using

java -Djava.rmi.server.hostname=YOUR_IP YOUR_APP

Get first day of week in SQL Server

I found this simple and usefull. Works even if first day of week is Sunday or Monday.

DECLARE @BaseDate AS Date

SET @BaseDate = GETDATE()

DECLARE @FisrtDOW AS Date

SELECT @FirstDOW = DATEADD(d,DATEPART(WEEKDAY,@BaseDate) *-1 + 1, @BaseDate)

How does setTimeout work in Node.JS?

The only way to ensure code is executed is to place your setTimeout logic in a different process.

Use the child process module to spawn a new node.js program that does your logic and pass data to that process through some kind of a stream (maybe tcp).

This way even if some long blocking code is running in your main process your child process has already started itself and placed a setTimeout in a new process and a new thread and will thus run when you expect it to.

Further complication are at a hardware level where you have more threads running then processes and thus context switching will cause (very minor) delays from your expected timing. This should be neglible and if it matters you need to seriously consider what your trying to do, why you need such accuracy and what kind of real time alternative hardware is available to do the job instead.

In general using child processes and running multiple node applications as separate processes together with a load balancer or shared data storage (like redis) is important for scaling your code.

Django: OperationalError No Such Table

I'm using Django 1.9, SQLite3 and DjangoCMS 3.2 and had the same issue. I solved it by running python manage.py makemigrations. This was followed by a prompt stating that the database contained non-null value types but did not have a default value set. It gave me two options: 1) select a one off value now or 2) exit and change the default setting in models.py. I selected the first option and gave the default value of 1. Repeated this four or five times until the prompt said it was finished. I then ran python manage.py migrate. Now it works just fine. Remember, by running python manage.py makemigrations first, a revised copy of the database is created (mine was 0004) and you can always revert back to a previous database state.

How do I add an existing Solution to GitHub from Visual Studio 2013

None of the answers were specific to my problem, so here's how I did it.

This is for Visual Studio 2015 and I had already made a repository on Github.com

If you already have your repository URL copy it and then in visual studio:

  • Go to Team Explorer
  • Click the "Sync" button
  • It should have 3 options listed with "get started" links.
  • I chose the "get started" link against "publish to remote repository", which it the bottom one
  • A yellow box will appear asking for the URL. Just paste the URL there and click publish.

Handle Guzzle exception and get HTTP body

None of the above responses are working for error that has no body but still has some describing text. For me, it was SSL certificate problem: unable to get local issuer certificate error. So I looked right into the code, because doc does't really say much, and did this (in Guzzle 7.1):

try {
    // call here
} catch (\GuzzleHttp\Exception\RequestException $e) {
    if ($e->hasResponse()) {
        $response = $e->getResponse();
        // message is in $response->getReasonPhrase()
    } else {
        $response = $e->getHandlerContext();
        if (isset($response['error'])) {
            // message is in $response['error']
        } else {
            // Unknown error occured!
        }
    }
}

AND/OR in Python?

x and y returns true if both x and y are true.
x or y returns if either one is true.

From this we can conclude that or contains and within itself unless you mean xOR (or except if and is true)

Column/Vertical selection with Keyboard in SublimeText 3

The reason why the sublime documented shortcuts for Mac does not work are they are linked to the shortcuts of other Mac functionalities such as Mission Control, Application Windows, etc. Solution: Go to System Preferences -> Keyboard -> Shortcuts and then un-check the options for Mission Control and Application Windows. Now try "Control + Shift [+ Arrow keys]" for selecting the required text and then move the cursor to the required location without any mouse click, so that the selection can be pasted with the correct indentation at the required location.

Regular Expression - 2 letters and 2 numbers in C#

This should get you for starting with two letters and ending with two numbers.

[A-Za-z]{2}(.*)[0-9]{2}

If you know it will always be just two and two you can

[A-Za-z]{2}[0-9]{2}

jQuery autoComplete view all on click?

<input type="text" name="q" id="q" placeholder="Selecciona..."/>


<script type="text/javascript">
//Mostrar el autocompletado con el evento focus
//Duda o comentario: http://WilzonMB.com
$(function () {
    var availableTags = [
        "MongoDB",
        "ExpressJS",
        "Angular",
        "NodeJS",
        "JavaScript",                
        "jQuery",
        "jQuery UI",
        "PHP",
        "Zend Framework",
        "JSON",
        "MySQL",
        "PostgreSQL",
        "SQL Server",
        "Oracle",
        "Informix",
        "Java",
        "Visual basic",
        "Yii",
        "Technology",
        "WilzonMB.com"
    ];
    $("#q").autocomplete({
        source: availableTags,
        minLength: 0
    }).focus(function(){            
       $(this).autocomplete('search', $(this).val())
     });
});
</script>

http://jsfiddle.net/wimarbueno/6zz8euqe/

Selecting the first "n" items with jQuery

Use lt pseudo selector:

$("a:lt(n)")

This matches the elements before the nth one (the nth element excluded). Numbering starts from 0.

Visual Studio Code PHP Intelephense Keep Showing Not Necessary Error

To those would prefer to keep it simple, stupid; If you rather get rid of the notices instead of installing a helper or downgrading, simply disable the error in your settings.json by adding this:

"intelephense.diagnostics.undefinedTypes": false

Inline list initialization in VB.NET

Collection initializers are only available in VB.NET 2010, released 2010-04-12:

Dim theVar = New List(Of String) From { "one", "two", "three" }

PHP Get name of current directory

To get the names of current directory we can use getcwd() or dirname(__FILE__) but getcwd() and dirname(__FILE__) are not synonymous. They do exactly what their names are. If your code is running by referring a class in another file which exists in some other directory then these both methods will return different results.

For example if I am calling a class, from where these two functions are invoked and the class exists in some /controller/goodclass.php from /index.php then getcwd() will return '/ and dirname(__FILE__) will return /controller.

Can you style an html radio button to look like a checkbox?

I don't think you can make a control look like anything other than a control with CSS.

Your best bet it to make a PRINT button goes to a new page with a graphic in place of the selected radio button, then do a window.print() from there.

Break promise chain and call a function based on the step in the chain where it is broken (rejected)

The reason your code doesn't work as expected is that it's actually doing something different from what you think it does.

Let's say you have something like the following:

stepOne()
.then(stepTwo, handleErrorOne)
.then(stepThree, handleErrorTwo)
.then(null, handleErrorThree);

To better understand what's happening, let's pretend this is synchronous code with try/catch blocks:

try {
    try {
        try {
            var a = stepOne();
        } catch(e1) {
            a = handleErrorOne(e1);
        }
        var b = stepTwo(a);
    } catch(e2) {
        b = handleErrorTwo(e2);
    }
    var c = stepThree(b);
} catch(e3) {
    c = handleErrorThree(e3);
}

The onRejected handler (the second argument of then) is essentially an error correction mechanism (like a catch block). If an error is thrown in handleErrorOne, it will be caught by the next catch block (catch(e2)), and so on.

This is obviously not what you intended.

Let's say we want the entire resolution chain to fail no matter what goes wrong:

stepOne()
.then(function(a) {
    return stepTwo(a).then(null, handleErrorTwo);
}, handleErrorOne)
.then(function(b) {
    return stepThree(b).then(null, handleErrorThree);
});

Note: We can leave the handleErrorOne where it is, because it will only be invoked if stepOne rejects (it's the first function in the chain, so we know that if the chain is rejected at this point, it can only be because of that function's promise).

The important change is that the error handlers for the other functions are not part of the main promise chain. Instead, each step has its own "sub-chain" with an onRejected that is only called if the step was rejected (but can not be reached by the main chain directly).

The reason this works is that both onFulfilled and onRejected are optional arguments to the then method. If a promise is fulfilled (i.e. resolved) and the next then in the chain doesn't have an onFulfilled handler, the chain will continue until there is one with such a handler.

This means the following two lines are equivalent:

stepOne().then(stepTwo, handleErrorOne)
stepOne().then(null, handleErrorOne).then(stepTwo)

But the following line is not equivalent to the two above:

stepOne().then(stepTwo).then(null, handleErrorOne)

Angular's promise library $q is based on kriskowal's Q library (which has a richer API, but contains everything you can find in $q). Q's API docs on GitHub could prove useful. Q implements the Promises/A+ spec, which goes into detail on how then and the promise resolution behaviour works exactly.

EDIT:

Also keep in mind that if you want to break out of the chain in your error handler, it needs to return a rejected promise or throw an Error (which will be caught and wrapped in a rejected promise automatically). If you don't return a promise, then wraps the return value in a resolve promise for you.

This means that if you don't return anything, you are effectively returning a resolved promise for the value undefined.

Is it possible to decrypt SHA1

SHA1 is a one way hash. So you can not really revert it.

That's why applications use it to store the hash of the password and not the password itself.

Like every hash function SHA-1 maps a large input set (the keys) to a smaller target set (the hash values). Thus collisions can occur. This means that two values of the input set map to the same hash value.

Obviously the collision probability increases when the target set is getting smaller. But vice versa this also means that the collision probability decreases when the target set is getting larger and SHA-1's target set is 160 bit.

Jeff Preshing, wrote a very good blog about Hash Collision Probabilities that can help you to decide which hash algorithm to use. Thanks Jeff.

In his blog he shows a table that tells us the probability of collisions for a given input set.

Hash Collision Probabilities Table

As you can see the probability of a 32-bit hash is 1 in 2 if you have 77163 input values.

A simple java program will show us what his table shows:

public class Main {

    public static void main(String[] args) {
        char[] inputValue = new char[10];

        Map<Integer, String> hashValues = new HashMap<Integer, String>();

        int collisionCount = 0;

        for (int i = 0; i < 77163; i++) {
            String asString = nextValue(inputValue);
            int hashCode = asString.hashCode();
            String collisionString = hashValues.put(hashCode, asString);
            if (collisionString != null) {
                collisionCount++;
                System.out.println("Collision: " + asString + " <-> " + collisionString);
            }
        }

        System.out.println("Collision count: " + collisionCount);
    }

    private static String nextValue(char[] inputValue) {
        nextValue(inputValue, 0);

        int endIndex = 0;
        for (int i = 0; i < inputValue.length; i++) {
            if (inputValue[i] == 0) {
                endIndex = i;
                break;
            }
        }

        return new String(inputValue, 0, endIndex);
    }

    private static void nextValue(char[] inputValue, int index) {
        boolean increaseNextIndex = inputValue[index] == 'z';

        if (inputValue[index] == 0 || increaseNextIndex) {
            inputValue[index] = 'A';
        } else {
            inputValue[index] += 1;
        }

        if (increaseNextIndex) {
            nextValue(inputValue, index + 1);
        }

    }

}

My output end with:

Collision: RvV <-> SWV
Collision: SvV <-> TWV
Collision: TvV <-> UWV
Collision: UvV <-> VWV
Collision: VvV <-> WWV
Collision: WvV <-> XWV
Collision count: 35135

It produced 35135 collsions and that's the nearly the half of 77163. And if I ran the program with 30084 input values the collision count is 13606. This is not exactly 1 in 10, but it is only a probability and the example program is not perfect, because it only uses the ascii chars between A and z.

Let's take the last reported collision and check

System.out.println("VvV".hashCode());
System.out.println("WWV".hashCode());

My output is

86390
86390

Conclusion:

If you have a SHA-1 value and you want to get the input value back you can try a brute force attack. This means that you have to generate all possible input values, hash them and compare them with the SHA-1 you have. But that will consume a lot of time and computing power. Some people created so called rainbow tables for some input sets. But these do only exist for some small input sets.

And remember that many input values map to a single target hash value. So even if you would know all mappings (which is impossible, because the input set is unbounded) you still can't say which input value it was.

How can I get argv[] as int?

/*

    Input from command line using atoi, and strtol 
*/

#include <stdio.h>//printf, scanf
#include <stdlib.h>//atoi, strtol 

//strtol - converts a string to a long int 
//atoi - converts string to an int 

int main(int argc, char *argv[]){

    char *p;//used in strtol 
    int i;//used in for loop

    long int longN = strtol( argv[1],&p, 10);
    printf("longN = %ld\n",longN);

    //cast (int) to strtol
    int N = (int) strtol( argv[1],&p, 10);
    printf("N = %d\n",N);

    int atoiN;
    for(i = 0; i < argc; i++)
    {
        //set atoiN equal to the users number in the command line 
        //The C library function int atoi(const char *str) converts the string argument str to an integer (type int).
        atoiN = atoi(argv[i]);
    }

    printf("atoiN = %d\n",atoiN);
    //-----------------------------------------------------//
    //Get string input from command line 
    char * charN;

    for(i = 0; i < argc; i++)
    {
        charN = argv[i];
    }

    printf("charN = %s\n", charN); 

}

Hope this helps. Good luck!

static linking only some libraries

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

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

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

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

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

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

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

How to use [DllImport("")] in C#?

You can't declare an extern local method inside of a method, or any other method with an attribute. Move your DLL import into the class:

using System.Runtime.InteropServices;


public class WindowHandling
{
    [DllImport("User32.dll")]
    public static extern int SetForegroundWindow(IntPtr point);

    public void ActivateTargetApplication(string processName, List<string> barcodesList)
    {
        Process p = Process.Start("notepad++.exe");
        p.WaitForInputIdle();
        IntPtr h = p.MainWindowHandle;
        SetForegroundWindow(h);
        SendKeys.SendWait("k");
        IntPtr processFoundWindow = p.MainWindowHandle;
    }
}

Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister

I resolved this issue by excluding byte-buddy dependency from springfox

<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-swagger2</artifactId>
  <version>2.7.0</version>
  <exclusions>
  <exclusion>
    <groupId>net.bytebuddy</groupId>
    <artifactId>byte-buddy</artifactId>
  </exclusion>
  </exclusions>
</dependency>

<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-swagger-ui</artifactId>
  <version>2.7.0</version>
  <exclusions>
  <exclusion>
    <groupId>net.bytebuddy</groupId>
    <artifactId>byte-buddy</artifactId>
  </exclusion>
</exclusions>
</dependency>

how to pass variable from shell script to sqlplus

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

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

or if BUILDING is $2 in your script:

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

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

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

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

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

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


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

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

or:

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

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

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

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

define MY_ALIAS = &1
define MY_MODEL = &2

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

From your separate question, maybe you just wanted:

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

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

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

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

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

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

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

How to change the interval time on bootstrap carousel?

The best way to get rid on it is adding or modifying the data-interval attribute like this:

<div data-ride="carousel" class="carousel slide" data-interval="10000" id="myCarousel">

It's specified on ms like it's usually on js, so 1000 = 1s, 3000 = 3s... 10000 = 10s.

By the way you can also specify it at 0 for not sliding automatically. It's useful when showing product images on mobile for example.

<div data-ride="carousel" class="carousel slide" data-interval="0" id="myCarousel">

How do I kill this tomcat process in Terminal?

This worked for me:

Step 1 : echo ps aux | grep org.apache.catalina.startup.Bootstrap | grep -v grep | awk '{ print $2 }'

This above command return "process_id"

Step 2: kill -9 process_id
// This process_id same as Step 1: output

Get query string parameters url values with jQuery / Javascript (querystring)

I wrote a little function where you only have to parse the name of the query parameter. So if you have: ?Project=12&Mode=200&date=2013-05-27 and you want the 'Mode' parameter you only have to parse the 'Mode' name into the function:

function getParameterByName( name ){
    var regexS = "[\\?&]"+name+"=([^&#]*)", 
  regex = new RegExp( regexS ),
  results = regex.exec( window.location.search );
  if( results == null ){
    return "";
  } else{
    return decodeURIComponent(results[1].replace(/\+/g, " "));
  }
}

// example caller:
var result =  getParameterByName('Mode');

Windows batch script to move files

Create a file called MoveFiles.bat with the syntax

move c:\Sourcefoldernam\*.* e:\destinationFolder

then schedule a task to run that MoveFiles.bat every 10 hours.

How to find most common elements of a list?

If you are using Count, or have created your own Count-style dict and want to show the name of the item and the count of it, you can iterate around the dictionary like so:

top_10_words = Counter(my_long_list_of_words)
# Iterate around the dictionary
for word in top_10_words:
        # print the word
        print word[0]
        # print the count
        print word[1]

or to iterate through this in a template:

{% for word in top_10_words %}
        <p>Word: {{ word.0 }}</p>
        <p>Count: {{ word.1 }}</p>
{% endfor %}

Hope this helps someone

How to check if an appSettings key exists?

Safely returned default value via generics and LINQ.

public T ReadAppSetting<T>(string searchKey, T defaultValue, StringComparison compare = StringComparison.Ordinal)
{
    if (ConfigurationManager.AppSettings.AllKeys.Any(key => string.Compare(key, searchKey, compare) == 0)) {
        try
        { // see if it can be converted.
            var converter = TypeDescriptor.GetConverter(typeof(T));
            if (converter != null) defaultValue = (T)converter.ConvertFromString(ConfigurationManager.AppSettings.GetValues(searchKey).First());
        }
        catch { } // nothing to do just return the defaultValue
    }
    return defaultValue;
}

Used as follows:

string LogFileName = ReadAppSetting("LogFile","LogFile");
double DefaultWidth = ReadAppSetting("Width",1280.0);
double DefaultHeight = ReadAppSetting("Height",1024.0);
Color DefaultColor = ReadAppSetting("Color",Colors.Black);

Git for beginners: The definitive practical guide

How to configure it to ignore files:

The ability to have git ignore files you don't wish it to track is very useful.

To ignore a file or set of files you supply a pattern. The pattern syntax for git is fairly simple, but powerful. It is applicable to all three of the different files I will mention bellow.

  • A blank line ignores no files, it is generally used as a separator.
  • Lines staring with # serve as comments.
  • The ! prefix is optional and will negate the pattern. Any negated pattern that matches will override lower precedence patterns.
  • Supports advanced expressions and wild cards
    • Ex: The pattern: *.[oa] will ignore all files in the repository ending in .o or .a (object and archive files)
  • If a pattern has a directory ending with a slash git will only match this directory and paths underneath it. This excludes regular files and symbolic links from the match.
  • A leading slash will match all files in that path name.
    • Ex: The pattern /*.c will match the file foo.c but not bar/awesome.c

Great Example from the gitignore(5) man page:

$ git status
[...]
# Untracked files:
[...]
#       Documentation/foo.html
#       Documentation/gitignore.html
#       file.o
#       lib.a
#       src/internal.o
[...]
$ cat .git/info/exclude
  # ignore objects and archives, anywhere in the tree.
  *.[oa]
$ cat Documentation/.gitignore
# ignore generated html files,
*.html
# except foo.html which is maintained by hand
!foo.html
$ git status
[...]
# Untracked files:
[...]
#       Documentation/foo.html
[...]

Generally there are three different ways to ignore untracked files.

1) Ignore for all users of the repository:

Add a file named .gitignore to the root of your working copy.

Edit .gitignore to match your preferences for which files should/shouldn't be ignored.

git add .gitignore 

and commit when you're done.

2) Ignore for only your copy of the repository:

Add/Edit the file $GIT_DIR/info/exclude in your working copy, with your preferred patterns.

Ex: My working copy is ~/src/project1 so I would edit ~/src/project1/.git/info/exclude

You're done!

3) Ignore in all situations, on your system:

Global ignore patterns for your system can go in a file named what ever you wish.

Mine personally is called ~/.gitglobalignore

I can then let git know of this file by editing my ~/.gitconfig file with the following line:

core.excludesfile = ~/.gitglobalignore

You're done!

I find the gitignore man page to be the best resource for more information.

Is it a bad practice to use break in a for loop?

Far from bad practice, Python (and other languages?) extended the for loop structure so part of it will only be executed if the loop doesn't break.

for n in range(5):
    for m in range(3):
        if m >= n:
            print('stop!')
            break
        print(m, end=' ')
    else:
        print('finished.')

Output:

stop!
0 stop!
0 1 stop!
0 1 2 finished.
0 1 2 finished.

Equivalent code without break and that handy else:

for n in range(5):
    aborted = False
    for m in range(3):
        if not aborted:
            if m >= n:
                print('stop!')
                aborted = True
            else:            
                print(m, end=' ')
    if not aborted:
        print('finished.')

Round to at most 2 decimal places (only if necessary)

None of the answers found here is correct. @stinkycheeseman asked to round up, you all rounded the number.

To round up, use this:

Math.ceil(num * 100)/100;

HTTP 404 Page Not Found in Web Api hosted in IIS 7.5

For me the solution was removing the following lines from my web.config file:

<dependentAssembly>
    <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.1.1.3" newVersion="4.1.1.3" />
</dependentAssembly>
<dependentAssembly>
    <assemblyIdentity name="Microsoft.IdentityModel.Tokens" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-5.5.0.0" newVersion="5.5.0.0" />
</dependentAssembly>

I noticed that VS had added them automatically, not sure why

Is it necessary to assign a string to a variable before comparing it to another?

if ([statusString isEqualToString:@"Wrong"]) {
    // do something
}

ant build.xml file doesn't exist

There may be two situations.

  1. No build.xml is present in the current directory
  2. Your ant configuration file has diffrent name.

Please see and confim the same. In the case one you have to find where your build file is located and in the case 2, You will have to run command ant -f <your build file name>.

Parser Error: '_Default' is not allowed here because it does not extend class 'System.Web.UI.Page' & MasterType declaration

Remember.. inherits is case sensitive for C# (not so for vb.net)

Found that out the hard way.

Why is using "for...in" for array iteration a bad idea?

The reason is that one construct:

_x000D_
_x000D_
var a = []; // Create a new empty array._x000D_
a[5] = 5;   // Perfectly legal JavaScript that resizes the array._x000D_
_x000D_
for (var i = 0; i < a.length; i++) {_x000D_
    // Iterate over numeric indexes from 0 to 5, as everyone expects._x000D_
    console.log(a[i]);_x000D_
}_x000D_
_x000D_
/* Will display:_x000D_
   undefined_x000D_
   undefined_x000D_
   undefined_x000D_
   undefined_x000D_
   undefined_x000D_
   5_x000D_
*/
_x000D_
_x000D_
_x000D_

can sometimes be totally different from the other:

_x000D_
_x000D_
var a = [];_x000D_
a[5] = 5;_x000D_
for (var x in a) {_x000D_
    // Shows only the explicitly set index of "5", and ignores 0-4_x000D_
    console.log(x);_x000D_
}_x000D_
_x000D_
/* Will display:_x000D_
   5_x000D_
*/
_x000D_
_x000D_
_x000D_

Also consider that JavaScript libraries might do things like this, which will affect any array you create:

_x000D_
_x000D_
// Somewhere deep in your JavaScript library..._x000D_
Array.prototype.foo = 1;_x000D_
_x000D_
// Now you have no idea what the below code will do._x000D_
var a = [1, 2, 3, 4, 5];_x000D_
for (var x in a){_x000D_
    // Now foo is a part of EVERY array and _x000D_
    // will show up here as a value of 'x'._x000D_
    console.log(x);_x000D_
}_x000D_
_x000D_
/* Will display:_x000D_
   0_x000D_
   1_x000D_
   2_x000D_
   3_x000D_
   4_x000D_
   foo_x000D_
*/
_x000D_
_x000D_
_x000D_

How to load a xib file in a UIView

You could try:

UIView *firstViewUIView = [[[NSBundle mainBundle] loadNibNamed:@"firstView" owner:self options:nil] firstObject];
[self.view.containerView addSubview:firstViewUIView];

How to write to Console.Out during execution of an MSTest test

Use the Debug.WriteLine. This will display your message in the Output window immediately. The only restriction is that you must run your test in Debug mode.

[TestMethod]
public void TestMethod1()
{
    Debug.WriteLine("Time {0}", DateTime.Now);
    System.Threading.Thread.Sleep(30000);
    Debug.WriteLine("Time {0}", DateTime.Now);
}

Output

enter image description here

How do I escape special characters in MySQL?

You can use mysql_real_escape_string. mysql_real_escape_string() does not escape % and _, so you should escape MySQL wildcards (% and _) separately.

Webpack not excluding node_modules

From your config file, it seems like you're only excluding node_modules from being parsed with babel-loader, but not from being bundled.

In order to exclude node_modules and native node libraries from bundling, you need to:

  1. Add target: 'node' to your webpack.config.js. This will exclude native node modules (path, fs, etc.) from being bundled.
  2. Use webpack-node-externals in order to exclude other node_modules.

So your result config file should look like:

var nodeExternals = require('webpack-node-externals');
...
module.exports = {
    ...
    target: 'node', // in order to ignore built-in modules like path, fs, etc. 
    externals: [nodeExternals()], // in order to ignore all modules in node_modules folder 
    ...
};

C# list.Orderby descending

look it this piece of code from my project

I'm trying to re-order the list based on a property inside my model,

 allEmployees = new List<Employee>(allEmployees.OrderByDescending(employee => employee.Name));

but I faced a problem when a small and capital letters exist, so to solve it, I used the string comparer.

allEmployees.OrderBy(employee => employee.Name,StringComparer.CurrentCultureIgnoreCase)

How to enable CORS in ASP.NET Core

You have to configure a CORS policy at application startup in the ConfigureServices method:

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(o => o.AddPolicy("MyPolicy", builder =>
    {
        builder.AllowAnyOrigin()
               .AllowAnyMethod()
               .AllowAnyHeader();
    }));

    // ...
}

The CorsPolicyBuilder in builder allows you to configure the policy to your needs. You can now use this name to apply the policy to controllers and actions:

[EnableCors("MyPolicy")]

Or apply it to every request:

public void Configure(IApplicationBuilder app)
{
    app.UseCors("MyPolicy");

    // ...

    // This should always be called last to ensure that
    // middleware is registered in the correct order.
    app.UseMvc();
}

How to change the default charset of a MySQL table?

If you want to change the table default character set and all character columns to a new character set, use a statement like this:

ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name;

So query will be:

ALTER TABLE etape_prospection CONVERT TO CHARACTER SET utf8;

React-Redux: Actions must be plain objects. Use custom middleware for async actions

You can't use fetch in actions without middleware. Actions must be plain objects. You can use a middleware like redux-thunk or redux-saga to do fetch and then dispatch another action.

Here is an example of async action using redux-thunk middleware.

export function checkUserLoggedIn (authCode) {
 let url = `${loginUrl}validate?auth_code=${authCode}`;
  return dispatch => {
    return fetch(url,{
      method: 'GET',
      headers: {
        "Content-Type": "application/json"
      }
      }
    )
      .then((resp) => {
        let json = resp.json();
       if (resp.status >= 200 && resp.status < 300) {
          return json;
        } else {
          return json.then(Promise.reject.bind(Promise));
        }
      })
      .then(
        json => {
          if (json.result && (json.result.status === 'error')) {
            dispatch(errorOccurred(json.result));
            dispatch(logOut());
          }
          else{
            dispatch(verified(json.result));
          }
        }
      )
      .catch((error) => {
        dispatch(warningOccurred(error, url));
      })
  }
}

Sum rows in data.frame or matrix

you can use rowSums

rowSums(data) should give you what you want.

ORA-12528: TNS Listener: all appropriate instances are blocking new connections. Instance "CLRExtProc", status UNKNOWN

I had this problem on my developent environment with Visual Studio.

What helped me was to Clean Solution in Visual Studio and then do a rebuild.

Unable to allocate array with shape and data type

Sometimes, this error pops up because of the kernel has reached its limit. Try to restart the kernel redo the necessary steps.

Using setattr() in python

The Python docs say all that needs to be said, as far as I can see.

setattr(object, name, value)

This is the counterpart of getattr(). The arguments are an object, a string and an arbitrary value. The string may name an existing attribute or a new attribute. The function assigns the value to the attribute, provided the object allows it. For example, setattr(x, 'foobar', 123) is equivalent to x.foobar = 123.

If this isn't enough, explain what you don't understand.

Want custom title / image / description in facebook share link from a flash app

I have a Joomla Module that displays stuff... and I want to be able to share that stuff on facebook and not the Page's Title Meta Description... so my workaround is to have a secret .php file on the server that gets executed when it detects the FB's

$_SERVER['HTTP_USER_AGENT']

if($_SERVER['HTTP_USER_AGENT'] != 'facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)') {
    echo 'Direct Access';
} else {
    echo 'FB Accessed';
}

and pass variables with the URL that formats that particular page with the title and meta desciption of the item I want to share from my joomla module...

a name="fb_share" share_url="MYURL/sharer.php?title=TITLE&desc=DESC"

hope this helps...

Which is better: <script type="text/javascript">...</script> or <script>...</script>

Both will work but xhtml standard requires you to specify the type too:

<script type="text/javascript">..</script> 

<!ELEMENT SCRIPT - - %Script;          -- script statements -->
<!ATTLIST SCRIPT
  charset     %Charset;      #IMPLIED  -- char encoding of linked resource --
  type        %ContentType;  #REQUIRED -- content type of script language --
  src         %URI;          #IMPLIED  -- URI for an external script --
  defer       (defer)        #IMPLIED  -- UA may defer execution of script --
  >

type = content-type [CI] This attribute specifies the scripting language of the element's contents and overrides the default scripting language. The scripting language is specified as a content type (e.g., "text/javascript"). Authors must supply a value for this attribute. There is no default value for this attribute.

Notices the emphasis above.

http://www.w3.org/TR/html4/interact/scripts.html

Note: As of HTML5 (far away), the type attribute is not required and is default.

How do you style a TextInput in react native for password input

I am using 0.56RC secureTextEntry={true} Along with password={true} then only its working as mentioned by @NicholasByDesign

How to merge two sorted arrays into a sorted array?

public static int[] mergeSorted(int[] left, int[] right) {
    System.out.println("merging " + Arrays.toString(left) + " and " + Arrays.toString(right));
    int[] merged = new int[left.length + right.length];
    int nextIndexLeft = 0;
    int nextIndexRight = 0;
    for (int i = 0; i < merged.length; i++) {
        if (nextIndexLeft >= left.length) {
            System.arraycopy(right, nextIndexRight, merged, i, right.length - nextIndexRight);
            break;
        }
        if (nextIndexRight >= right.length) {
            System.arraycopy(left, nextIndexLeft, merged, i, left.length - nextIndexLeft);
            break;
        }
        if (left[nextIndexLeft] <= right[nextIndexRight]) {
            merged[i] = left[nextIndexLeft];
            nextIndexLeft++;
            continue;
        }
        if (left[nextIndexLeft] > right[nextIndexRight]) {
            merged[i] = right[nextIndexRight];
            nextIndexRight++;
            continue;
        }
    }
    System.out.println("merged : " + Arrays.toString(merged));
    return merged;
}

Just a small different from the original solution

Creating a border like this using :before And :after Pseudo-Elements In CSS?

#footer:after
{
   content: "";
    width: 40px;
    height: 3px;
    background-color: #529600;
    left: 0;
    position: relative;
    display: block;
    top: 10px;
}

Adding header to all request with Retrofit 2

Kotlin version would be

fun getHeaderInterceptor():Interceptor{
    return object : Interceptor {
        @Throws(IOException::class)
        override fun intercept(chain: Interceptor.Chain): Response {
            val request =
            chain.request().newBuilder()
                    .header(Headers.KEY_AUTHORIZATION, "Bearer.....")
                    .build()
            return chain.proceed(request)
        }
    }
}


private fun createOkHttpClient(): OkHttpClient {
    return OkHttpClient.Builder()
            .apply {
                if(BuildConfig.DEBUG){
                    this.addInterceptor(HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BASIC))
                }
            }
            .addInterceptor(getHeaderInterceptor())
            .build()
}

How to check list A contains any value from list B?

I write a faster method for it can make the small one to set. But I test it in some data that some time it's faster that Intersect but some time Intersect fast that my code.

    public static bool Contain<T>(List<T> a, List<T> b)
    {
        if (a.Count <= 10 && b.Count <= 10)
        {
            return a.Any(b.Contains);
        }

        if (a.Count > b.Count)
        {
            return Contain((IEnumerable<T>) b, (IEnumerable<T>) a);
        }
        return Contain((IEnumerable<T>) a, (IEnumerable<T>) b);
    }

    public static bool Contain<T>(IEnumerable<T> a, IEnumerable<T> b)
    {
        HashSet<T> j = new HashSet<T>(a);
        return b.Any(j.Contains);
    }

The Intersect calls Set that have not check the second size and this is the Intersect's code.

        Set<TSource> set = new Set<TSource>(comparer);
        foreach (TSource element in second) set.Add(element);
        foreach (TSource element in first)
            if (set.Remove(element)) yield return element;

The difference in two methods is my method use HashSet and check the count and Intersect use set that is faster than HashSet. We dont warry its performance.

The test :

   static void Main(string[] args)
    {
        var a = Enumerable.Range(0, 100000);
        var b = Enumerable.Range(10000000, 1000);
        var t = new Stopwatch();
        t.Start();
        Repeat(()=> { Contain(a, b); });
        t.Stop();
        Console.WriteLine(t.ElapsedMilliseconds);//490ms

        var a1 = Enumerable.Range(0, 100000).ToList();
        var a2 = b.ToList();
        t.Restart();
        Repeat(()=> { Contain(a1, a2); });
        t.Stop();

        Console.WriteLine(t.ElapsedMilliseconds);//203ms

        t.Restart();
        Repeat(()=>{ a.Intersect(b).Any(); });
        t.Stop();
        Console.WriteLine(t.ElapsedMilliseconds);//190ms

        t.Restart();
        Repeat(()=>{ b.Intersect(a).Any(); });
        t.Stop();
        Console.WriteLine(t.ElapsedMilliseconds);//497ms

        t.Restart();
        a.Any(b.Contains);
        t.Stop();
        Console.WriteLine(t.ElapsedMilliseconds);//600ms

    }

    private static void Repeat(Action a)
    {
        for (int i = 0; i < 100; i++)
        {
            a();
        }
    }

How to suppress "unused parameter" warnings in C?

Seeing that this is marked as gcc you can use the command line switch Wno-unused-parameter.

For example:

gcc -Wno-unused-parameter test.c

Of course this effects the whole file (and maybe project depending where you set the switch) but you don't have to change any code.

How to declare a constant map in Golang?

You can create constants in many different ways:

const myString = "hello"
const pi = 3.14 // untyped constant
const life int = 42 // typed constant (can use only with ints)

You can also create a enum constant:

const ( 
   First = 1
   Second = 2
   Third = 4
)

You can not create constants of maps, arrays and it is written in effective go:

Constants in Go are just that—constant. They are created at compile time, even when defined as locals in functions, and can only be numbers, characters (runes), strings or booleans. Because of the compile-time restriction, the expressions that define them must be constant expressions, evaluatable by the compiler. For instance, 1<<3 is a constant expression, while math.Sin(math.Pi/4) is not because the function call to math.Sin needs to happen at run time.

RESTful call in Java

Indeed, this is "very complicated in Java":

From: https://jersey.java.net/documentation/latest/client.html

Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://foo").path("bar");
Invocation.Builder invocationBuilder = target.request(MediaType.TEXT_PLAIN_TYPE);
Response response = invocationBuilder.get();

Run cmd commands through Java

Once you get the reference to Process, you can call getOutpuStream on it to get the standard input of the cmd prompt. Then you can send any command over the stream using write method as with any other stream.

Note that it is process.getOutputStream() which is connected to the stdin on the spawned process. Similarly, to get the output of any command, you will need to call getInputStream and then read over this as any other input stream.

Play infinitely looping video on-load in HTML5

As of April 2018, Chrome (along with several other major browsers) now require the muted attribute too.

Therefore, you should use

<video width="320" height="240" autoplay loop muted>
  <source src="movie.mp4" type="video/mp4" />
</video>

What is the difference between private and protected members of C++ classes?

Protected members can only be accessed by descendants of the class, and by code in the same module. Private members can only be accessed by the class they're declared in, and by code in the same module.

Of course friend functions throw this out the window, but oh well.

SQL Server loop - how do I loop through a set of records

This is what I've been doing if you need to do something iterative... but it would be wise to look for set operations first. Also, do not do this because you don't want to learn cursors.

select top 1000 TableID
into #ControlTable 
from dbo.table
where StatusID = 7

declare @TableID int

while exists (select * from #ControlTable)
begin

    select top 1 @TableID = TableID
    from #ControlTable
    order by TableID asc

    -- Do something with your TableID

    delete #ControlTable
    where TableID = @TableID

end

drop table #ControlTable

"Android library projects cannot be launched"?

It says “Android library projects cannot be launched” because Android library projects cannot be launched. That simple. You cannot run a library. If you want to test a library, create an Android project that uses the library, and execute it.

iReport not starting using JRE 8

While ireport does not officially support java8, there is a fairly simple way to make ireport (tested with ireport 5.1) work with Java 8. The problem is actually in netbeans. There is a very simple patch, assuming you don't care about the improved security in Java 8:

http://hg.netbeans.org/jet-main/diff/3238e03c676f/openide.util/src/org/openide/util/WeakListenerImpl.java

I didn't even use the exact netbeans source used by ireport. I just downloaded the latest WeakListenerImpl.java in full from the above repository, and compiled it in the ireport directory with platform9/lib/org-openide-util.jar in the compiler classpath

cd blah/blah/iReport-5.1.0
wget http://hg.netbeans.org/jet-main/raw-file/3238e03c676f/openide.util/src/org/openide/util/WeakListenerImpl.java
javac -d . -cp platform9/lib/org-openide-util.jar WeakListenerImpl.java
zip -r platform9/lib/org-openide-util.jar org

I am avoiding running eclipse just to edit jasper reports as long as I can. The netbeans based ireport is so much lighter weight. Running Eclipse is like using emacs.

Factorial in numpy and scipy

The answer for Ashwini is great, in pointing out that scipy.math.factorial, numpy.math.factorial, math.factorial are the same functions. However, I'd recommend use the one that Janne mentioned, that scipy.special.factorial is different. The one from scipy can take np.ndarray as an input, while the others can't.

In [12]: import scipy.special

In [13]: temp = np.arange(10) # temp is an np.ndarray

In [14]: math.factorial(temp) # This won't work
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-14-039ec0734458> in <module>()
----> 1 math.factorial(temp)

TypeError: only length-1 arrays can be converted to Python scalars

In [15]: scipy.special.factorial(temp) # This works!
Out[15]: 
array([  1.00000000e+00,   1.00000000e+00,   2.00000000e+00,
         6.00000000e+00,   2.40000000e+01,   1.20000000e+02,
         7.20000000e+02,   5.04000000e+03,   4.03200000e+04,
         3.62880000e+05])

So, if you are doing factorial to a np.ndarray, the one from scipy will be easier to code and faster than doing the for-loops.

printing a value of a variable in postgresql

You can raise a notice in Postgres as follows:

raise notice 'Value: %', deletedContactId;

Read here

Refresh a page using JavaScript or HTML

window.location.reload()

should work however there are many different options like:

window.location.href=window.location.href

Unit test naming best practices

I recently came up with the following convention for naming my tests, their classes and containing projects in order to maximize their descriptivenes:

Lets say I am testing the Settings class in a project in the MyApp.Serialization namespace.

First I will create a test project with the MyApp.Serialization.Tests namespace.

Within this project and of course the namespace I will create a class called IfSettings (saved as IfSettings.cs).

Lets say I am testing the SaveStrings() method. -> I will name the test CanSaveStrings().

When I run this test it will show the following heading:

MyApp.Serialization.Tests.IfSettings.CanSaveStrings

I think this tells me very well, what it is testing.

Of course it is usefull that in English the noun "Tests" is the same as the verb "tests".

There is no limit to your creativity in naming the tests, so that we get full sentence headings for them.

Usually the Test names will have to start with a verb.

Examples include:

  • Detects (e.g. DetectsInvalidUserInput)
  • Throws (e.g. ThrowsOnNotFound)
  • Will (e.g. WillCloseTheDatabaseAfterTheTransaction)

etc.

Another option is to use "that" instead of "if".

The latter saves me keystrokes though and describes more exactly what I am doing, since I don't know, that the tested behavior is present, but am testing if it is.

[Edit]

After using above naming convention for a little longer now, I have found, that the If prefix can be confusing, when working with interfaces. It just so happens, that the testing class IfSerializer.cs looks very similar to the interface ISerializer.cs in the "Open Files Tab". This can get very annoying when switching back and forth between the tests, the class being tested and its interface. As a result I would now choose That over If as a prefix.

Additionally I now use - only for methods in my test classes as it is not considered best practice anywhere else - the "_" to separate words in my test method names as in:

[Test] public void detects_invalid_User_Input()

I find this to be easier to read.

[End Edit]

I hope this spawns some more ideas, since I consider naming tests of great importance as it can save you a lot of time that would otherwise have been spent trying to understand what the tests are doing (e.g. after resuming a project after an extended hiatus).

Why is char[] preferred over String for passwords?

It is debatable as to whether you should use String or use Char[] for this purpose because both have their advantages and disadvantages. It depends on what the user needs.

Since Strings in Java are immutable, whenever some tries to manipulate your string it creates a new Object and the existing String remains unaffected. This could be seen as an advantage for storing a password as a String, but the object remains in memory even after use. So if anyone somehow got the memory location of the object, that person can easily trace your password stored at that location.

Char[] is mutable, but it has the advantage that after its usage the programmer can explicitly clean the array or override values. So when it's done being used it is cleaned and no one could ever know about the information you had stored.

Based on the above circumstances, one can get an idea whether to go with String or to go with Char[] for their requirements.

jQuery Button.click() event is triggered twice

Just like what Nick is trying to say, something from outside is triggering the event twice. To solve that you should use event.stopPropagation() to prevent the parent element from bubbling.

$('button').click(function(event) {
    event.stopPropagation();
});

I hope this helps.

How do I move files in node.js?

Just my 2 cents as stated in the answer above : The copy() method shouldn't be used as-is for copying files without a slight adjustment:

function copy(callback) {
    var readStream = fs.createReadStream(oldPath);
    var writeStream = fs.createWriteStream(newPath);

    readStream.on('error', callback);
    writeStream.on('error', callback);

    // Do not callback() upon "close" event on the readStream
    // readStream.on('close', function () {
    // Do instead upon "close" on the writeStream
    writeStream.on('close', function () {
        callback();
    });

    readStream.pipe(writeStream);
}

The copy function wrapped in a Promise:

function copy(oldPath, newPath) {
  return new Promise((resolve, reject) => {
    const readStream = fs.createReadStream(oldPath);
    const writeStream = fs.createWriteStream(newPath);

    readStream.on('error', err => reject(err));
    writeStream.on('error', err => reject(err));

    writeStream.on('close', function() {
      resolve();
    });

    readStream.pipe(writeStream);
  })

However, keep in mind that the filesystem might crash if the target folder doesn't exist.

Can't specify the 'async' modifier on the 'Main' method of a console app

To avoid freezing when you call a function somewhere down the call stack that tries to re-join the current thread (which is stuck in a Wait), you need to do the following:

class Program
{
    static void Main(string[] args)
    {
        Bootstrapper bs = new Bootstrapper();
        List<TvChannel> list = Task.Run((Func<Task<List<TvChannel>>>)bs.GetList).Result;
    }
}

(the cast is only required to resolve ambiguity)

How to fix error with xml2-config not found when installing PHP from sources?

For the latest versions it is needed to install libxml++2.6-dev like that:

apt-get install libxml++2.6-dev

How can I force WebKit to redraw/repaint to propagate style changes?

I was suffering the same issue. danorton's 'toggling display' fix did work for me when added to the step function of my animation but I was concerned about performance and I looked for other options.

In my circumstance the element which wasn't repainting was within an absolutely position element which did not, at the time, have a z-index. Adding a z-index to this element changed the behaviour of Chrome and repaints happened as expected -> animations became smooth.

I doubt that this is a panacea, I imagine it depends why Chrome has chosen not to redraw the element but I'm posting this specific solution here in the help it hopes someone.

Cheers, Rob

tl;dr >> Try adding a z-index to the element or a parent thereof.

Read a text file in R line by line

I suggest you check out chunked and disk.frame. They both have functions for reading in CSVs chunk-by-chunk.

In particular, disk.frame::csv_to_disk.frame may be the function you are after?

npm notice created a lockfile as package-lock.json. You should commit this file

Yes you should, As it locks the version of each and every package which you are using in your app and when you run npm install it install the exact same version in your node_modules folder. This is important becasue let say you are using bootstrap 3 in your application and if there is no package-lock.json file in your project then npm install will install bootstrap 4 which is the latest and you whole app ui will break due to version mismatch.

CSS: Position text in the middle of the page

Even though you've accepted an answer, I want to post this method. I use jQuery to center it vertically instead of css (although both of these methods work). Here is a fiddle, and I'll post the code here anyways.

HTML:

<h1>Hello world!</h1>

Javascript (jQuery):

$(document).ready(function(){
  $('h1').css({ 'width':'100%', 'text-align':'center' });
  var h1 = $('h1').height();
  var h = h1/2;
  var w1 = $(window).height();
  var w = w1/2;
  var m = w - h
  $('h1').css("margin-top",m + "px")
});

This takes the height of the viewport, divides it by two, subtracts half the height of the h1, and sets that number to the margin-top of the h1. The beauty of this method is that it works on multiple-line h1s.

EDIT: I modified it so that it centered it every time the window is resized.

JavaScript Promises - reject vs. throw

Yes, the biggest difference is that reject is a callback function that gets carried out after the promise is rejected, whereas throw cannot be used asynchronously. If you chose to use reject, your code will continue to run normally in asynchronous fashion whereas throw will prioritize completing the resolver function (this function will run immediately).

An example I've seen that helped clarify the issue for me was that you could set a Timeout function with reject, for example:

_x000D_
_x000D_
new Promise((resolve, reject) => {
  setTimeout(()=>{reject('err msg');console.log('finished')}, 1000);
  return resolve('ret val')
})
.then((o) => console.log("RESOLVED", o))
.catch((o) => console.log("REJECTED", o));
_x000D_
_x000D_
_x000D_

The above could would not be possible to write with throw.

_x000D_
_x000D_
try{
  new Promise((resolve, reject) => {
    setTimeout(()=>{throw new Error('err msg')}, 1000);
    return resolve('ret val')
  })
  .then((o) => console.log("RESOLVED", o))
  .catch((o) => console.log("REJECTED", o));
}catch(o){
  console.log("IGNORED", o)
}
_x000D_
_x000D_
_x000D_

In the OP's small example the difference in indistinguishable but when dealing with more complicated asynchronous concept the difference between the two can be drastic.

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

There is no such thing like a DateTime without a year!

From what I gather your design is a bit strange:

I would recommend storing a "start" (DateTime including year for the FIRST occurence) and a value which designates how to calculate the next event... this could be for example a TimeSpan or some custom structure esp. since "every year" can mean that the event occurs on a specific date and would not automatically be the same as saysing that it occurs in +365 days.

After the event occurs you calculate the next and store that etc.

Fixing broken UTF-8 encoding

I found a solution after days of search. My comment is going to be buried but anyway...

  1. I get the corrupted data with php.

  2. I don't use set names UTF8

  3. I use utf8_decode() on my data

  4. I update my database with my new decoded data, still not using set names UTF8

and voilà :)

How to trim leading and trailing white spaces of a string?

For trimming your string, Go's "strings" package have TrimSpace(), Trim() function that trims leading and trailing spaces.

Check the documentation for more information.

How to change the background color of a UIButton while it's highlighted?

To solve this problem I created a Category to handle backgroundColor States with UIButtons:
ButtonBackgroundColor-iOS

You can install the category as a pod.

Easy to use with Objective-C

@property (nonatomic, strong) UIButton *myButton;

...

[self.myButton bbc_backgroundColorNormal:[UIColor redColor]
                 backgroundColorSelected:[UIColor blueColor]];

Even more easy to use with Swift:

import ButtonBackgroundColor

...

let myButton:UIButton = UIButton(type:.Custom)

myButton.bbc_backgroundColorNormal(UIColor.redColor(), backgroundColorSelected: UIColor.blueColor())

I recommend you import the pod with:

platform :ios, '8.0'
use_frameworks!

pod 'ButtonBackgroundColor', '~> 1.0'

Using use_frameworks! in your Podfile makes easier to use your pods with Swift and objective-C.

IMPORTANT

I also wrote a Blog Post with more information.

How do you specify the Java compiler version in a pom.xml file?

maven-compiler-plugin it's already present in plugins hierarchy dependency in pom.xml. Check in Effective POM.

For short you can use properties like this:

<properties>
   <maven.compiler.source>1.8</maven.compiler.source>
   <maven.compiler.target>1.8</maven.compiler.target>
</properties>

I'm using Maven 3.2.5.

How to print something to the console in Xcode?

@Logan has put this perfectly. Potentially something worth pointing out also is that you can use

printf(whatever you want to print);

For example if you were printing a string:

printf("hello");

How to calculate date difference in JavaScript?

use Moment.js for all your JavaScript related date-time calculation

Answer to your question is:

var a = moment([2007, 0, 29]);   
var b = moment([2007, 0, 28]);    
a.diff(b) // 86400000  

Complete details can be found here

Spring Boot application in eclipse, the Tomcat connector configured to listen on port XXXX failed to start

In your windows os follow the following steps:


1)search services 2)Find Apache tomcat 3)Right-click on it and select end 4)Run your spring boot application again it will work

How to get Bitmap from an Uri?

Inset of getBitmap which is depricated now I use the following approach in Kotlin

PICK_IMAGE_REQUEST ->
    data?.data?.let {
        val bitmap = BitmapFactory.decodeStream(contentResolver.openInputStream(it))
        imageView.setImageBitmap(bitmap)
    }

Set a persistent environment variable from cmd.exe

:: Sets environment variables for both the current `cmd` window 
::   and/or other applications going forward.
:: I call this file keyz.cmd to be able to just type `keyz` at the prompt 
::   after changes because the word `keys` is already taken in Windows.

@echo off

:: set for the current window
set APCA_API_KEY_ID=key_id
set APCA_API_SECRET_KEY=secret_key
set APCA_API_BASE_URL=https://paper-api.alpaca.markets

:: setx also for other windows and processes going forward
setx APCA_API_KEY_ID     %APCA_API_KEY_ID%
setx APCA_API_SECRET_KEY %APCA_API_SECRET_KEY%
setx APCA_API_BASE_URL   %APCA_API_BASE_URL%

:: Displaying what was just set.
set apca

:: Or for copy/paste manually ...
:: setx APCA_API_KEY_ID     'key_id'
:: setx APCA_API_SECRET_KEY 'secret_key'
:: setx APCA_API_BASE_URL   'https://paper-api.alpaca.markets'

How do I drop table variables in SQL-Server? Should I even do this?

Here is a solution

Declare @tablename varchar(20)
DECLARE @SQL NVARCHAR(MAX)

SET @tablename = '_RJ_TEMPOV4'
SET @SQL = 'DROP TABLE dbo.' + QUOTENAME(@tablename) + '';

IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(@tablename) AND type in (N'U'))
    EXEC sp_executesql @SQL;

Works fine on SQL Server 2014 Christophe

How do I change Bootstrap 3 column order on mobile layout?

October 2017

I would like to add another Bootstrap 4 solution. One that worked for me.

The CSS "Order" property, combined with a media query, can be used to re-order columns when they get stacked in smaller screens.

Something like this:

@media only screen and (max-width: 768px) {
    #first {
        order: 2;
    }
    #second {
        order: 4;
    }
    #third {
        order: 1;
    }
    #fourth {
        order: 3;
    }
}

CodePen Link: https://codepen.io/preston206/pen/EwrXqm

Adjust the screen size and you'll see the columns get stacked in a different order.

I'll tie this in with the original poster's question. With CSS, the navbar, sidebar, and content can be targeted and then order properties applied within a media query.

CSS – why doesn’t percentage height work?

Another option is to add style to div

<div style="position: absolute; height:somePercentage%; overflow:auto(or other overflow value)">
 //to be scrolled 
</div>

And it means that an element is positioned relative to the nearest positioned ancestor.

How to change the color of a SwitchCompat from AppCompat library

My working example of using style and android:theme simultaneously (API >= 21)

<android.support.v7.widget.SwitchCompat
    android:id="@+id/wan_enable_nat_switch"
    style="@style/Switch"
    app:layout_constraintBaseline_toBaselineOf="@id/wan_enable_nat_label"
    app:layout_constraintEnd_toEndOf="parent" />

<style name="Switch">
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:paddingEnd">16dp</item>
    <item name="android:focusableInTouchMode">true</item>
    <item name="android:theme">@style/ThemeOverlay.MySwitchCompat</item>
</style>

<style name="ThemeOverlay.MySwitchCompat" parent="">
    <item name="colorControlActivated">@color/colorPrimaryDark</item>
    <item name="colorSwitchThumbNormal">@color/text_outline_not_active</item>
    <item name="android:colorForeground">#42221f1f</item>
</style>

Redirecting unauthorized controller in ASP.NET MVC

In your Startup.Auth.cs file add this line:

LoginPath = new PathString("/Account/Login"),

Example:

// Enable the application to use a cookie to store information for the signed in user
// and to use a cookie to temporarily store information about a user logging in with a third party login provider
// Configure the sign in cookie
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
    AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
    LoginPath = new PathString("/Account/Login"),
    Provider = new CookieAuthenticationProvider
    {
        // Enables the application to validate the security stamp when the user logs in.
        // This is a security feature which is used when you change a password or add an external login to your account.  
        OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
        validateInterval: TimeSpan.FromMinutes(30),
        regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
    }
});

Explaining the 'find -mtime' command

The POSIX specification for find says:

-mtimen The primary shall evaluate as true if the file modification time subtracted from the initialization time, divided by 86400 (with any remainder discarded), is n.

Interestingly, the description of find does not further specify 'initialization time'. It is probably, though, the time when find is initialized (run).

In the descriptions, wherever n is used as a primary argument, it shall be interpreted as a decimal integer optionally preceded by a plus ( '+' ) or minus-sign ( '-' ) sign, as follows:

+n More than n.
  n Exactly n.
-n Less than n.

At the given time (2014-09-01 00:53:44 -4:00, where I'm deducing that AST is Atlantic Standard Time, and therefore the time zone offset from UTC is -4:00 in ISO 8601 but +4:00 in ISO 9945 (POSIX), but it doesn't matter all that much):

1409547224 = 2014-09-01 00:53:44 -04:00
1409457540 = 2014-08-30 23:59:00 -04:00

so:

1409547224 - 1409457540 = 89684
89684 / 86400 = 1

Even if the 'seconds since the epoch' values are wrong, the relative values are correct (for some time zone somewhere in the world, they are correct).

The n value calculated for the 2014-08-30 log file therefore is exactly 1 (the calculation is done with integer arithmetic), and the +1 rejects it because it is strictly a > 1 comparison (and not >= 1).

Appending output of a Batch file To log file

It's also possible to use java Foo | tee -a some.log. it just prints to stdout as well. Like:

user at Computer in ~
$ echo "hi" | tee -a foo.txt
hi

user at Computer in ~
$ echo "hello" | tee -a foo.txt
hello

user at Computer in ~
$ cat foo.txt
hi
hello

replace NULL with Blank value or Zero in sql server

You can use the COALESCE function to automatically return null values as 0. Syntax is as shown below:

SELECT COALESCE(total_amount, 0) from #Temp1

Static vs class functions/variables in Swift classes?

Adding to above answers static methods are static dispatch means the compiler know which method will be executed at runtime as the static method can not be overridden while the class method can be a dynamic dispatch as subclass can override these.

Releasing memory in Python

Memory allocated on the heap can be subject to high-water marks. This is complicated by Python's internal optimizations for allocating small objects (PyObject_Malloc) in 4 KiB pools, classed for allocation sizes at multiples of 8 bytes -- up to 256 bytes (512 bytes in 3.3). The pools themselves are in 256 KiB arenas, so if just one block in one pool is used, the entire 256 KiB arena will not be released. In Python 3.3 the small object allocator was switched to using anonymous memory maps instead of the heap, so it should perform better at releasing memory.

Additionally, the built-in types maintain freelists of previously allocated objects that may or may not use the small object allocator. The int type maintains a freelist with its own allocated memory, and clearing it requires calling PyInt_ClearFreeList(). This can be called indirectly by doing a full gc.collect.

Try it like this, and tell me what you get. Here's the link for psutil.Process.memory_info.

import os
import gc
import psutil

proc = psutil.Process(os.getpid())
gc.collect()
mem0 = proc.get_memory_info().rss

# create approx. 10**7 int objects and pointers
foo = ['abc' for x in range(10**7)]
mem1 = proc.get_memory_info().rss

# unreference, including x == 9999999
del foo, x
mem2 = proc.get_memory_info().rss

# collect() calls PyInt_ClearFreeList()
# or use ctypes: pythonapi.PyInt_ClearFreeList()
gc.collect()
mem3 = proc.get_memory_info().rss

pd = lambda x2, x1: 100.0 * (x2 - x1) / mem0
print "Allocation: %0.2f%%" % pd(mem1, mem0)
print "Unreference: %0.2f%%" % pd(mem2, mem1)
print "Collect: %0.2f%%" % pd(mem3, mem2)
print "Overall: %0.2f%%" % pd(mem3, mem0)

Output:

Allocation: 3034.36%
Unreference: -752.39%
Collect: -2279.74%
Overall: 2.23%

Edit:

I switched to measuring relative to the process VM size to eliminate the effects of other processes in the system.

The C runtime (e.g. glibc, msvcrt) shrinks the heap when contiguous free space at the top reaches a constant, dynamic, or configurable threshold. With glibc you can tune this with mallopt (M_TRIM_THRESHOLD). Given this, it isn't surprising if the heap shrinks by more -- even a lot more -- than the block that you free.

In 3.x range doesn't create a list, so the test above won't create 10 million int objects. Even if it did, the int type in 3.x is basically a 2.x long, which doesn't implement a freelist.

jQuery Ajax PUT with parameters

Can you provide an example, because put should work fine as well?

Documentation -

The type of request to make ("POST" or "GET"); the default is "GET". Note: Other HTTP request methods, such as PUT and DELETE, can also be used here, but they are not supported by all browsers.

Have the example in fiddle and the form parameters are passed fine (as it is put it will not be appended to url) -

$.ajax({
  url: '/echo/html/',
  type: 'PUT',
  data: "name=John&location=Boston",
  success: function(data) {
    alert('Load was performed.');
  }
});

Demo tested from jQuery 1.3.2 onwards on Chrome.

How to convert an object to a byte array in C#

Take a look at Serialization, a technique to "convert" an entire object to a byte stream. You may send it to the network or write it into a file and then restore it back to an object later.

How do I create a simple 'Hello World' module in Magento?

A Magento Module is a group of directories containing blocks, controllers, helpers, and models that are needed to create a specific store feature. It is the unit of customization in the Magento platform. Magento Modules can be created to perform multiple functions with supporting logic to influence user experience and storefront appearance. It has a life cycle that allows them to be installed, deleted, or disabled. From the perspective of both merchants and extension developers, modules are the central unit of the Magento platform.

Declaration of Module

We have to declare the module by using the configuration file. As Magento 2 search for configuration module in etc directory of the module. So now we will create configuration file module.xml.

The code will look like this:

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd"> <module name="Cloudways_Mymodule" setup_version="1.0.0"></module> </config>

Registration of Module The module must be registered in the Magento 2 system by using Magento Component Registrar class. Now we will create the file registration.php in the module root directory:

app/code/Cloudways/Mymodule/registration.php

The Code will look like this:

?php
\Magento\Framework\Component\ComponentRegistrar::register(
\Magento\Framework\Component\ComponentRegistrar::MODULE,
'Cloudways_Mymodule',
__DIR__
);

Check Module Status After following the steps above, we would have created a simple module. Now we are going to check the status of the module and whether it is enabled or disabled by using the following command line:

php bin/magento module:status

php bin/magento module:enable Cloudways_Mymodule

Share your feedback once you have gone through complete process

How to assign colors to categorical variables in ggplot2 that have stable mapping?

This is an old post, but I was looking for answer to this same question,

Why not try something like:

scale_color_manual(values = c("foo" = "#999999", "bar" = "#E69F00"))

If you have categorical values, I don't see a reason why this should not work.

FFmpeg: How to split video efficiently?

does the later approach save computation time and memory?

There is no big difference between those two examples that you provided. The first example cuts the video sequentially, in 2 steps, while the second example does it at the same time (using threads). No particular speed-up will be noticeable. You can read more about creating multiple outputs with FFmpeg

Further more, what you can use (in recent FFmpeg) is the stream segmenter muxer which can:

output streams to a number of separate files of nearly fixed duration. Output filename pattern can be set in a fashion similar to image2.

Remove tracking branches no longer on remote

I wouldn't normally answer a question that already has 16 answers, but all the other answers are wrong, and the right answer is so simple. The question says, "Is there a simple way to delete all tracking branches whose remote equivalent no longer exists?"

If "simple" means deleting them all in one go, not fragile, not dangerous, and without reliance on tools that not all readers will have, then the right answer is: no.

Some answers are simple, but they don't do what was asked. Others do what was asked, but are not simple: all rely on parsing Git output through text-manipulation commands or scripting languages, which may not be present on every system. On top of that, most of the suggestions use porcelain commands, whose output is not designed to be parsed by script ("porcelain" refers to the commands intended for human operation; scripts should use the lower-level "plumbing" commands).

Further reading:


If you want to do this safely, for the use case in the question (garbage-collect tracking branches which have been deleted on the server but still exist as local branches) and with high-level Git commands only, you have to

  • git fetch --prune (or git fetch -p, which is an alias, or git prune remote origin which does the same thing without fetching, and is probably not what you want most of the time).
  • Note any remote branches that are reported as deleted. Or, to find them later on, git branch -v (any orphaned tracking branch will be marked "[gone]").
  • git branch -d [branch_name] on each orphaned tracking branch

(which is what some of the other answers propose).

If you want to script a solution, then for-each-ref is your starting point, as in Mark Longair's answer here and this answer to another question, but I can't see a way to exploit it without writing a shell script loop, or using xargs or something.


Background explanation

To understand what's happening, you need to appreciate that, in the situation of tracking branches, you have not one branch, but three. (And recall that "branch" means simply a pointer to a commit.)

Given a tracking branch feature/X, the remote repository (server) will have this branch and call it feature/X. Your local repository has a branch remotes/origin/feature/X which means, "This is what the remote told me its feature/X branch was, last time we talked," and finally, the local repository has a branch feature/X which points to your latest commit, and is configured to "track" remotes/origin/feature/X, meaning that you can pull and push to keep them aligned.

At some point, someone has deleted the feature/X on the remote. From that moment, you are left with your local feature/X (which you probably don't want any more, since work on feature X is presumably finished), and your remotes/origin/feature/X which is certainly useless because its only purpose was to remember the state of the server's branch.

And Git will let you automatically clean up the redundant remotes/origin/feature/X -- that's what git fetch --prune does -- but for some reason, it doesn't let you automatically delete your own feature/X... even though your feature/X still contains the orphaned tracking information, so it has the information to identify former tracking branches that have been fully merged. (After all, it can give you the information that lets you do the operation by hand yourself.)

Unable to find a @SpringBootConfiguration when doing a JpaTest

This is more the the error itself, not answering the original question:

We were migrating from java 8 to java 11. Application compiled successfully, but the errors Unable to find a @SpringBootConfiguration started to appear in the integration tests when ran from command line using maven (from IntelliJ it worked).

It appeared that maven-failsafe-plugin stopped seeing the classes on classpath, we fixed that by telling failsafe plugin to include the classes manually:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-failsafe-plugin</artifactId>
            <configuration>
                <additionalClasspathElements>
                    <additionalClasspathElement>${basedir}/target/classes</additionalClasspathElement>
                </additionalClasspathElements>
            </configuration>
            ...
        </plugin>

Error In PHP5 ..Unable to load dynamic library

(For Ubuntu users)

I had the same problem, but none of the answers above solved that. Here is how I solved the problem.

Open your php.ini file (mine was in /etc/php/7.3/cli/php.ini).

You may have something like this:

extension=pdo_mysql

Or maybe:

extension=/here/is/the/path/to/your/file/pdo_mysql.so

Add the following line before extension=pdo_mysql

extension=pdo

So, you will have:

extension=pdo
extension=pdo_mysql

It seems that the problem is (at least in my case) that we need to load pdo extension first to load the pdo_mysql extension.

Hope that helps!

WARNING in budgets, maximum exceeded for initial

What is Angular CLI Budgets? Budgets is one of the less known features of the Angular CLI. It’s a rather small but a very neat feature!

As applications grow in functionality, they also grow in size. Budgets is a feature in the Angular CLI which allows you to set budget thresholds in your configuration to ensure parts of your application stay within boundaries which you setOfficial Documentation

Or in other words, we can describe our Angular application as a set of compiled JavaScript files called bundles which are produced by the build process. Angular budgets allows us to configure expected sizes of these bundles. More so, we can configure thresholds for conditions when we want to receive a warning or even fail build with an error if the bundle size gets too out of control!

How To Define A Budget? Angular budgets are defined in the angular.json file. Budgets are defined per project which makes sense because every app in a workspace has different needs.

Thinking pragmatically, it only makes sense to define budgets for the production builds. Prod build creates bundles with “true size” after applying all optimizations like tree-shaking and code minimization.

Oops, a build error! The maximum bundle size was exceeded. This is a great signal that tells us that something went wrong…

  1. We might have experimented in our feature and didn’t clean up properly
  2. Our tooling can go wrong and perform a bad auto-import, or we pick bad item from the suggested list of imports
  3. We might import stuff from lazy modules in inappropriate locations
  4. Our new feature is just really big and doesn’t fit into existing budgets

First Approach: Are your files gzipped?

Generally speaking, gzipped file has only about 20% the size of the original file, which can drastically decrease the initial load time of your app. To check if you have gzipped your files, just open the network tab of developer console. In the “Response Headers”, if you should see “Content-Encoding: gzip”, you are good to go.

How to gzip? If you host your Angular app in most of the cloud platforms or CDN, you should not worry about this issue as they probably have handled this for you. However, if you have your own server (such as NodeJS + expressJS) serving your Angular app, definitely check if the files are gzipped. The following is an example to gzip your static assets in a NodeJS + expressJS app. You can hardly imagine this dead simple middleware “compression” would reduce your bundle size from 2.21MB to 495.13KB.

const compression = require('compression')
const express = require('express')
const app = express()
app.use(compression())

Second Approach:: Analyze your Angular bundle

If your bundle size does get too big you may want to analyze your bundle because you may have used an inappropriate large-sized third party package or you forgot to remove some package if you are not using it anymore. Webpack has an amazing feature to give us a visual idea of the composition of a webpack bundle.

enter image description here

It’s super easy to get this graph.

  1. npm install -g webpack-bundle-analyzer
  2. In your Angular app, run ng build --stats-json (don’t use flag --prod). By enabling --stats-json you will get an additional file stats.json
  3. Finally, run webpack-bundle-analyzer ./dist/stats.json and your browser will pop up the page at localhost:8888. Have fun with it.

ref 1: How Did Angular CLI Budgets Save My Day And How They Can Save Yours

ref 2: Optimize Angular bundle size in 4 steps

Is it not possible to stringify an Error using JSON.stringify?

JSON.stringify(err, Object.getOwnPropertyNames(err))

seems to work

[from a comment by /u/ub3rgeek on /r/javascript] and felixfbecker's comment below

How to replace specific values in a oracle database column?

I'm using Version 4.0.2.15 with Build 15.21

For me I needed this:

UPDATE table_name SET column_name = REPLACE(column_name,"search str","replace str");

Putting t.column_name in the first argument of replace did not work.

PHP include relative path

function relativepath($to){
    $a=explode("/",$_SERVER["PHP_SELF"] );
    $index= array_search("$to",$a);
    $str=""; 
    for ($i = 0; $i < count($a)-$index-2; $i++) {
        $str.= "../";
    }
    return $str;
    }

Here is the best solution i made about that, you just need to specify at which level you want to stop, but the problem is that you have to use this folder name one time.

How to encrypt a large file in openssl using public key

I found the instructions at http://www.czeskis.com/random/openssl-encrypt-file.html useful.

To paraphrase the linked site with filenames from your example:

Generate a symmetric key because you can encrypt large files with it

openssl rand -base64 32 > key.bin

Encrypt the large file using the symmetric key

openssl enc -aes-256-cbc -salt -in myLargeFile.xml \
  -out myLargeFile.xml.enc -pass file:./key.bin

Encrypt the symmetric key so you can safely send it to the other person

openssl rsautl -encrypt -inkey public.pem -pubin -in key.bin -out key.bin.enc

Destroy the un-encrypted symmetric key so nobody finds it

shred -u key.bin

At this point, you send the encrypted symmetric key (key.bin.enc) and the encrypted large file (myLargeFile.xml.enc) to the other person

The other person can then decrypt the symmetric key with their private key using

openssl rsautl -decrypt -inkey private.pem -in key.bin.enc -out key.bin

Now they can use the symmetric key to decrypt the file

openssl enc -d -aes-256-cbc -in myLargeFile.xml.enc \
  -out myLargeFile.xml -pass file:./key.bin

And you're done. The other person has the decrypted file and it was safely sent.

Customizing Bootstrap CSS template

The best option in my opinion is to compile a custom LESS file including bootstrap.less, a custom variables.less file and your own rules :

  1. Clone bootstrap in your root folder : git clone https://github.com/twbs/bootstrap.git
  2. Rename it "bootstrap"
  3. Create a package.json file : https://gist.github.com/jide/8440609
  4. Create a Gruntfile.js : https://gist.github.com/jide/8440502
  5. Create a "less" folder
  6. Copy bootstrap/less/variables.less into the "less" folder
  7. Change the font path : @icon-font-path: "../bootstrap/fonts/";
  8. Create a custom style.less file in the "less" folder which imports bootstrap.less and your custom variables.less file : https://gist.github.com/jide/8440619
  9. Run npm install
  10. Run grunt watch

Now you can modify the variables any way you want, override bootstrap rules in your custom style.less file, and if some day you want to update bootstrap, you can replace the whole bootstrap folder !

EDIT: I created a Bootstrap boilerplate using this technique : https://github.com/jide/bootstrap-boilerplate

Check if list is empty in C#

gridview itself has a method that checks if the datasource you are binding it to is empty, it lets you display something else.

Call a function from another file?

There isn't any need to add file.py while importing. Just write from file import function, and then call the function using function(a, b). The reason why this may not work, is because file is one of Python's core modules, so I suggest you change the name of your file.

Note that if you're trying to import functions from a.py to a file called b.py, you will need to make sure that a.py and b.py are in the same directory.

What is the .idea folder?

When you use the IntelliJ IDE, all the project-specific settings for the project are stored under the .idea folder.

Project settings are stored with each specific project as a set of xml files under the .idea folder. If you specify the default project settings, these settings will be automatically used for each newly created project.

Check this documentation for the IDE settings and here is their recommendation on Source Control and an example .gitignore file.

Note: If you are using git or some version control system, you might want to set this folder "ignore". Example - for git, add this directory to .gitignore. This way, the application is not IDE-specific.

www-data permissions?

As stated in an article by Slicehost:

User setup

So let's start by adding the main user to the Apache user group:

sudo usermod -a -G www-data demo

That adds the user 'demo' to the 'www-data' group. Do ensure you use both the -a and the -G options with the usermod command shown above.

You will need to log out and log back in again to enable the group change.

Check the groups now:

groups
...
# demo www-data

So now I am a member of two groups: My own (demo) and the Apache group (www-data).

Folder setup

Now we need to ensure the public_html folder is owned by the main user (demo) and is part of the Apache group (www-data).

Let's set that up:

sudo chgrp -R www-data /home/demo/public_html

As we are talking about permissions I'll add a quick note regarding the sudo command: It's a good habit to use absolute paths (/home/demo/public_html) as shown above rather than relative paths (~/public_html). It ensures sudo is being used in the correct location.

If you have a public_html folder with symlinks in place then be careful with that command as it will follow the symlinks. In those cases of a working public_html folder, change each folder by hand.

Setgid

Good so far, but remember the command we just gave only affects existing folders. What about anything new?

We can set the ownership so anything new is also in the 'www-data' group.

The first command will change the permissions for the public_html directory to include the "setgid" bit:

sudo chmod 2750 /home/demo/public_html

That will ensure that any new files are given the group 'www-data'. If you have subdirectories, you'll want to run that command for each subdirectory (this type of permission doesn't work with '-R'). Fortunately new subdirectories will be created with the 'setgid' bit set automatically.

If we need to allow write access to Apache, to an uploads directory for example, then set the permissions for that directory like so:

sudo chmod 2770 /home/demo/public_html/domain1.com/public/uploads

The permissions only need to be set once as new files will automatically be assigned the correct ownership.

Android ImageView Fixing Image Size

I had the same issue and this helped me.

<ImageView
    android:id="@+id/image"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:scaleType="fitXY"
    />

How can I generate a self-signed certificate with SubjectAltName using OpenSSL?

Can someone help me with the exact syntax?

It's a three-step process, and it involves modifying the openssl.cnf file. You might be able to do it with only command line options, but I don't do it that way.

Find your openssl.cnf file. It is likely located in /usr/lib/ssl/openssl.cnf:

$ find /usr/lib -name openssl.cnf
/usr/lib/openssl.cnf
/usr/lib/openssh/openssl.cnf
/usr/lib/ssl/openssl.cnf

On my Debian system, /usr/lib/ssl/openssl.cnf is used by the built-in openssl program. On recent Debian systems it is located at /etc/ssl/openssl.cnf

You can determine which openssl.cnf is being used by adding a spurious XXX to the file and see if openssl chokes.


First, modify the req parameters. Add an alternate_names section to openssl.cnf with the names you want to use. There are no existing alternate_names sections, so it does not matter where you add it.

[ alternate_names ]

DNS.1        = example.com
DNS.2        = www.example.com
DNS.3        = mail.example.com
DNS.4        = ftp.example.com

Next, add the following to the existing [ v3_ca ] section. Search for the exact string [ v3_ca ]:

subjectAltName      = @alternate_names

You might change keyUsage to the following under [ v3_ca ]:

keyUsage = digitalSignature, keyEncipherment

digitalSignature and keyEncipherment are standard fare for a server certificate. Don't worry about nonRepudiation. It's a useless bit thought up by computer science guys/gals who wanted to be lawyers. It means nothing in the legal world.

In the end, the IETF (RFC 5280), browsers and CAs run fast and loose, so it probably does not matter what key usage you provide.


Second, modify the signing parameters. Find this line under the CA_default section:

# Extension copying option: use with caution.
# copy_extensions = copy

And change it to:

# Extension copying option: use with caution.
copy_extensions = copy

This ensures the SANs are copied into the certificate. The other ways to copy the DNS names are broken.


Third, generate your self-signed certificate:

$ openssl genrsa -out private.key 3072
$ openssl req -new -x509 -key private.key -sha256 -out certificate.pem -days 730
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
...

Finally, examine the certificate:

$ openssl x509 -in certificate.pem -text -noout
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 9647297427330319047 (0x85e215e5869042c7)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, ST=MD, L=Baltimore, O=Test CA, Limited, CN=Test CA/[email protected]
        Validity
            Not Before: Feb  1 05:23:05 2014 GMT
            Not After : Feb  1 05:23:05 2016 GMT
        Subject: C=US, ST=MD, L=Baltimore, O=Test CA, Limited, CN=Test CA/[email protected]
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (3072 bit)
                Modulus:
                    00:e2:e9:0e:9a:b8:52:d4:91:cf:ed:33:53:8e:35:
                    ...
                    d6:7d:ed:67:44:c3:65:38:5d:6c:94:e5:98:ab:8c:
                    72:1c:45:92:2c:88:a9:be:0b:f9
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Key Identifier:
                34:66:39:7C:EC:8B:70:80:9E:6F:95:89:DB:B5:B9:B8:D8:F8:AF:A4
            X509v3 Authority Key Identifier:
                keyid:34:66:39:7C:EC:8B:70:80:9E:6F:95:89:DB:B5:B9:B8:D8:F8:AF:A4

            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Key Usage:
                Digital Signature, Non Repudiation, Key Encipherment, Certificate Sign
            X509v3 Subject Alternative Name:
                DNS:example.com, DNS:www.example.com, DNS:mail.example.com, DNS:ftp.example.com
    Signature Algorithm: sha256WithRSAEncryption
         3b:28:fc:e3:b5:43:5a:d2:a0:b8:01:9b:fa:26:47:8e:5c:b7:
         ...
         71:21:b9:1f:fa:30:19:8b:be:d2:19:5a:84:6c:81:82:95:ef:
         8b:0a:bd:65:03:d1

Delete directories recursively in Java

Java 7 added support for walking directories with symlink handling:

import java.nio.file.*;

public static void removeRecursive(Path path) throws IOException
{
    Files.walkFileTree(path, new SimpleFileVisitor<Path>()
    {
        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
                throws IOException
        {
            Files.delete(file);
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException
        {
            // try to delete the file anyway, even if its attributes
            // could not be read, since delete-only access is
            // theoretically possible
            Files.delete(file);
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException
        {
            if (exc == null)
            {
                Files.delete(dir);
                return FileVisitResult.CONTINUE;
            }
            else
            {
                // directory iteration failed; propagate exception
                throw exc;
            }
        }
    });
}

I use this as a fallback from platform-specific methods (in this untested code):

public static void removeDirectory(Path directory) throws IOException
{
    // does nothing if non-existent
    if (Files.exists(directory))
    {
        try
        {
            // prefer OS-dependent directory removal tool
            if (SystemUtils.IS_OS_WINDOWS)
                Processes.execute("%ComSpec%", "/C", "RD /S /Q \"" + directory + '"');
            else if (SystemUtils.IS_OS_UNIX)
                Processes.execute("/bin/rm", "-rf", directory.toString());
        }
        catch (ProcessExecutionException | InterruptedException e)
        {
            // fallback to internal implementation on error
        }

        if (Files.exists(directory))
            removeRecursive(directory);
    }
}

(SystemUtils is from Apache Commons Lang. Processes is private but its behavior should be obvious.)

Can't bind to 'routerLink' since it isn't a known property

I'll add another case where I was getting the same error but just being a dummy. I had added [routerLinkActiveOptions]="{exact: true}" without yet adding routerLinkActive="active".

My incorrect code was

<a class="nav-link active" routerLink="/dashboard" [routerLinkActiveOptions]="{exact: true}">
  Home
</a>

when it should have been

<a class="nav-link active" routerLink="/dashboard" routerLinkActive="active" [routerLinkActiveOptions]="{exact: true}">
  Home
</a>

Without having routerLinkActive, you can't have routerLinkActiveOptions.

json.dumps vs flask.jsonify

This is flask.jsonify()

def jsonify(*args, **kwargs):
    if __debug__:
        _assert_have_json()
    return current_app.response_class(json.dumps(dict(*args, **kwargs),
        indent=None if request.is_xhr else 2), mimetype='application/json')

The json module used is either simplejson or json in that order. current_app is a reference to the Flask() object i.e. your application. response_class() is a reference to the Response() class.

How do I install the babel-polyfill library?

This changed a bit in babel v6.

From the docs:

The polyfill will emulate a full ES6 environment. This polyfill is automatically loaded when using babel-node.

Installation:
$ npm install babel-polyfill

Usage in Node / Browserify / Webpack:
To include the polyfill you need to require it at the top of the entry point to your application.
require("babel-polyfill");

Usage in Browser:
Available from the dist/polyfill.js file within a babel-polyfill npm release. This needs to be included before all your compiled Babel code. You can either prepend it to your compiled code or include it in a <script> before it.

NOTE: Do not require this via browserify etc, use babel-polyfill.

SQL ORDER BY date problem

Unsure what dbms you're using however I'd do it this way in Microsoft SQL:

select      [date]
from        tbemp 
order by    cast([date] as datetime) asc

Replace line break characters with <br /> in ASP.NET MVC Razor view

Use the CSS white-space property instead of opening yourself up to XSS vulnerabilities!

<span style="white-space: pre-line">@Model.CommentText</span>

Numpy: Creating a complex array from 2 real ones?

There's of course the rather obvious:

Data[...,0] + 1j * Data[...,1]

How to find foreign key dependencies in SQL Server?

One that I really like to use is called SQL Dependency Tracker by Red Gate Software. You can put in any database object(s) such as tables, stored procedures, etc. and it will then automatically draw the relationship lines between all the other objects that rely on your selected item(s).

Gives a very good graphical representation of the dependencies in your schema.

Keep SSH session alive

For those wondering, @edward-coast

If you want to set the keep alive for the server, add this to /etc/ssh/sshd_config:

ClientAliveInterval 60
ClientAliveCountMax 2

ClientAliveInterval: Sets a timeout interval in seconds after which if no data has been received from the client, sshd(8) will send a message through the encrypted channel to request a response from the client.

ClientAliveCountMax: Sets the number of client alive messages (see below) which may be sent without sshd(8) receiving any messages back from the client. If this threshold is reached while client alive messages are being sent, sshd will disconnect the client, terminating the session.

Why can't I see the "Report Data" window when creating reports?

If the report designer is opened, Report Data Pane can be enabled using view menu.

 View -> Report Data

json call with C#

Its just a sample of how to post Json data and get Json data to/from a Rest API in BIDS 2008 using System.Net.WebRequest and without using newtonsoft. This is just a sample code and definitely can be fine tuned (well tested and it works and serves my test purpose like a charm). Its just to give you an Idea. I wanted this thread but couldn't find hence posting this.These were my major sources from where I pulled this. Link 1 and Link 2

Code that works(unit tested)

           //Get Example
            var httpWebRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("https://abc.def.org/testAPI/api/TestFile");
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "GET";

            var username = "usernameForYourApi";
            var password = "passwordForYourApi";

            var bytes = Encoding.UTF8.GetBytes(username + ":" + password);
            httpWebRequest.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(bytes));
            var httpResponse = (System.Net.HttpWebResponse)httpWebRequest.GetResponse();
            using (StreamReader streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                string result = streamReader.ReadToEnd();
                Dts.Events.FireInformation(3, "result from readng stream", result, "", 0, ref fireagain);
            }


            //Post Example
            var httpWebRequestPost = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("https://abc.def.org/testAPI/api/TestFile");
            httpWebRequestPost.ContentType = "application/json";
            httpWebRequestPost.Method = "POST";
            bytes = Encoding.UTF8.GetBytes(username + ":" + password);
            httpWebRequestPost.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(bytes));

            //POST DATA newtonsoft didnt worked with BIDS 2008 in this test package
            //json https://stackoverflow.com/questions/6201529/how-do-i-turn-a-c-sharp-object-into-a-json-string-in-net
            // fill File model with some test data
            CSharpComplexClass fileModel = new CSharpComplexClass();
            fileModel.CarrierID = 2;
            fileModel.InvoiceFileDate = DateTime.Now;
            fileModel.EntryMethodID = EntryMethod.Manual;
            fileModel.InvoiceFileStatusID = FileStatus.NeedsReview;
            fileModel.CreateUserID = "37f18f01-da45-4d7c-a586-97a0277440ef";
            string json = new JavaScriptSerializer().Serialize(fileModel);
            Dts.Events.FireInformation(3, "reached json", json, "", 0, ref fireagain);
            byte[] byteArray = Encoding.UTF8.GetBytes(json);
            httpWebRequestPost.ContentLength = byteArray.Length;
            // Get the request stream.  
            Stream dataStream = httpWebRequestPost.GetRequestStream();
            // Write the data to the request stream.  
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.  
            dataStream.Close();
            // Get the response.  
            WebResponse response = httpWebRequestPost.GetResponse();
            // Display the status.  
            //Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            Dts.Events.FireInformation(3, "Display the status", ((HttpWebResponse)response).StatusDescription, "", 0, ref fireagain);
            // Get the stream containing content returned by the server.  
            dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.  
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.  
            string responseFromServer = reader.ReadToEnd();
            Dts.Events.FireInformation(3, "responseFromServer ", responseFromServer, "", 0, ref fireagain);

References in my test script task inside BIDS 2008(having SP1 and 3.5 framework) enter image description here

How to trigger ngClick programmatically

Using plain old JavaScript worked for me:
document.querySelector('#elementName').click();

when exactly are we supposed to use "public static final String"?

? public makes it accessible across the other classes. You can use it without instantiate of the class or using any object.

? static makes it uniform value across all the class instances. It ensures that you don't waste memory creating many of the same thing if it will be the same value for all the objects.

? final makes it non-modifiable value. It's a "constant" value which is same across all the class instances and cannot be modified.

A server is already running. Check …/tmp/pids/server.pid. Exiting - rails

Short and Crisp single line command, that will take care of it.

kill -9 $(lsof -i tcp:3000 -t)

How do I count the number of occurrences of a char in a String?

 public static int countSubstring(String subStr, String str) {

    int count = 0;
    for (int i = 0; i < str.length(); i++) {
        if (str.substring(i).startsWith(subStr)) {
            count++;
        }
    }
    return count;
}

Best way to write to the console in PowerShell

Default behaviour of PowerShell is just to dump everything that falls out of a pipeline without being picked up by another pipeline element or being assigned to a variable (or redirected) into Out-Host. What Out-Host does is obviously host-dependent.

Just letting things fall out of the pipeline is not a substitute for Write-Host which exists for the sole reason of outputting text in the host application.

If you want output, then use the Write-* cmdlets. If you want return values from a function, then just dump the objects there without any cmdlet.

How to run a command in the background and get no output?

If you want to run the script in a linux kickstart you have to run as below .

sh /tmp/script.sh > /dev/null 2>&1 < /dev/null &

How to get text from EditText?

String fname = ((EditText)findViewById(R.id.txtFirstName)).getText().toString();
String lname = ((EditText)findViewById(R.id.txtLastName)).getText().toString();
((EditText)findViewById(R.id.txtFullName)).setText(fname + " "+lname);

How do I view the SQL generated by the Entity Framework?

I am doing integration test, and needed this to debug the generated SQL statement in Entity Framework Core 2.1, so I use DebugLoggerProvider or ConsoleLoggerProvider like so:

[Fact]
public async Task MyAwesomeTest
    {
        //setup log to debug sql queries
        var loggerFactory = new LoggerFactory();
        loggerFactory.AddProvider(new DebugLoggerProvider());
        loggerFactory.AddProvider(new ConsoleLoggerProvider(new ConsoleLoggerSettings()));

        var builder = new DbContextOptionsBuilder<DbContext>();
        builder
            .UseSqlServer("my connection string") //"Server=.;Initial Catalog=TestDb;Integrated Security=True"
            .UseLoggerFactory(loggerFactory);

        var dbContext = new DbContext(builder.Options);

        ........

Here is a sample output from Visual Studio console:

Sample SQL statement output

Custom alert and confirm box in jquery

Try using SweetAlert its just simply the best . You will get a lot of customization and flexibility.

Confirm Example

sweetAlert(
  {
    title: "Are you sure?",
    text: "You will not be able to recover this imaginary file!",
    type: "warning",   
    showCancelButton: true,   
    confirmButtonColor: "#DD6B55",
    confirmButtonText: "Yes, delete it!"
  }, 
  deleteIt()
);

Sample Alert

adding onclick event to dynamically added button?

I was having a similar issue but none of these fixes worked. The problem was that my button was not yet on the page. The fix for this ended up being going from this:

//Bad code.
var btn = document.createElement('button');
btn.onClick = function() {  console.log("hey");  }

to this:

//Working Code.  I don't like it, but it works. 
var btn = document.createElement('button');
var wrapper = document.createElement('div');
wrapper.appendChild(btn);

document.body.appendChild(wrapper);
var buttons = wrapper.getElementsByTagName("BUTTON");
buttons[0].onclick = function(){  console.log("hey");  }

I have no clue at all why this works. Adding the button to the page and referring to it any other way did not work.

How to create text file and insert data to that file on Android

If you want to create a file and write and append data to it many times, then use the below code, it will create file if not exits and will append data if it exists.

 SimpleDateFormat formatter = new SimpleDateFormat("yyyy_MM_dd");
        Date now = new Date();
        String fileName = formatter.format(now) + ".txt";//like 2016_01_12.txt


         try
            {
                File root = new File(Environment.getExternalStorageDirectory()+File.separator+"Music_Folder", "Report Files");
                //File root = new File(Environment.getExternalStorageDirectory(), "Notes");
                if (!root.exists()) 
                {
                    root.mkdirs();
                }
                File gpxfile = new File(root, fileName);


                FileWriter writer = new FileWriter(gpxfile,true);
                writer.append(sBody+"\n\n");
                writer.flush();
                writer.close();
                Toast.makeText(this, "Data has been written to Report File", Toast.LENGTH_SHORT).show();
            }
            catch(IOException e)
            {
                 e.printStackTrace();

            }

How to read data from a file in Lua

You should use the I/O Library where you can find all functions at the io table and then use file:read to get the file content.

local open = io.open

local function read_file(path)
    local file = open(path, "rb") -- r read mode and b binary mode
    if not file then return nil end
    local content = file:read "*a" -- *a or *all reads the whole file
    file:close()
    return content
end

local fileContent = read_file("foo.html");
print (fileContent);

Launching an application (.EXE) from C#?

Here's a snippet of helpful code:

using System.Diagnostics;

// Prepare the process to run
ProcessStartInfo start = new ProcessStartInfo();
// Enter in the command line arguments, everything you would enter after the executable name itself
start.Arguments = arguments; 
// Enter the executable to run, including the complete path
start.FileName = ExeName;
// Do you want to show a console window?
start.WindowStyle = ProcessWindowStyle.Hidden;
start.CreateNoWindow = true;
int exitCode;


// Run the external process & wait for it to finish
using (Process proc = Process.Start(start))
{
     proc.WaitForExit();

     // Retrieve the app's exit code
     exitCode = proc.ExitCode;
}

There is much more you can do with these objects, you should read the documentation: ProcessStartInfo, Process.

Lumen: get URL parameter in a Blade view

As per official 5.8 docs:

The request() function returns the current request instance or obtains an input item:

$request = request();

$value = request('key', $default);

Docs

Paging with LINQ for objects

Here is my performant approach to paging when using LINQ to objects:

public static IEnumerable<IEnumerable<T>> Page<T>(this IEnumerable<T> source, int pageSize)
{
    Contract.Requires(source != null);
    Contract.Requires(pageSize > 0);
    Contract.Ensures(Contract.Result<IEnumerable<IEnumerable<T>>>() != null);

    using (var enumerator = source.GetEnumerator())
    {
        while (enumerator.MoveNext())
        {
            var currentPage = new List<T>(pageSize)
            {
                enumerator.Current
            };

            while (currentPage.Count < pageSize && enumerator.MoveNext())
            {
                currentPage.Add(enumerator.Current);
            }
            yield return new ReadOnlyCollection<T>(currentPage);
        }
    }
}

This can then be used like so:

var items = Enumerable.Range(0, 12);

foreach(var page in items.Page(3))
{
    // Do something with each page
    foreach(var item in page)
    {
        // Do something with the item in the current page       
    }
}

None of this rubbish Skip and Take which will be highly inefficient if you are interested in multiple pages.

DIV :after - add content after DIV

Position your <div> absolutely at the bottom and don't forget to give div.A a position: relative - http://jsfiddle.net/TTaMx/

    .A {
        position: relative;
        margin: 40px 0;
        height: 40px;
        width: 200px;
        background: #eee;
    }

    .A:after {
        content: " ";
        display: block;
        background: #c00;
        height: 29px;
        width: 100%;

        position: absolute;
        bottom: -29px;
    }?

How do I parse JSON with Objective-C?

JSON parsing using NSJSONSerialization

   NSString* path  = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"json"];
   
    //Here you can take JSON string from your URL ,I am using json file
    NSString* jsonString = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSError *jsonError;
    NSArray *jsonDataArray = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:&jsonError];
  
    NSLog(@"jsonDataArray: %@",jsonDataArray);

    NSDictionary *jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&jsonError];
if(jsonObject !=nil){
   // NSString *errorCode=[NSMutableString stringWithFormat:@"%@",[jsonObject objectForKey:@"response"]];
   
        
        if(![[jsonObject objectForKey:@"#data"] isEqual:@""]){
            
            NSMutableArray *array=[jsonObject objectForKey:@"#data"];
             // NSLog(@"array: %@",array);
            NSLog(@"array: %d",array.count);  
            
            int k = 0;
            for(int z = 0; z<array.count;z++){
                
                NSString *strfd = [NSString stringWithFormat:@"%d",k];
                NSDictionary *dicr = jsonObject[@"#data"][strfd];
                k=k+1;
                // NSLog(@"dicr: %@",dicr);
                 NSLog(@"Firstname - Lastname   : %@ - %@",
                     [NSMutableString stringWithFormat:@"%@",[dicr objectForKey:@"user_first_name"]],
                     [NSMutableString stringWithFormat:@"%@",[dicr objectForKey:@"user_last_name"]]);
            }
            
          }

     }

You can see the Console output as below :

Firstname - Lastname : Chandra Bhusan - Pandey

Firstname - Lastname : Kalaiyarasan - Balu

Firstname - Lastname : (null) - (null)

Firstname - Lastname : Girija - S

Firstname - Lastname : Girija - S

Firstname - Lastname : (null) - (null)

How to create my json string by using C#?

No real need for the JSON.NET package. You could use JavaScriptSerializer. The Serialize method will turn a managed type instance into a JSON string.

var serializer = new JavaScriptSerializer();
var json = serializer.Serialize(instanceOfThing);

What is the time complexity of indexing, inserting and removing from common data structures?

Amortized Big-O for hashtables:

  • Insert - O(1)
  • Retrieve - O(1)
  • Delete - O(1)

Note that there is a constant factor for the hashing algorithm, and the amortization means that actual measured performance may vary dramatically.

What are good message queue options for nodejs?

Take a look at node-busmq - it's a production grade, highly available and scalable message bus backed by redis.

I wrote this module for our global cloud and it's currently deployed in our production environment in several datacenters around the world. It supports named queues, peer-to-peer communication, guaranteed delivery and federation.

For more information on why we created this module you can read this blog post: All Aboard The Message Bus

Compiling C++11 with g++

Your Ubuntu definitely has a sufficiently recent version of g++. The flag to use is -std=c++0x.

Should I set max pool size in database connection string? What happens if I don't?

"currently yes but i think it might cause problems at peak moments" I can confirm, that I had a problem where I got timeouts because of peak requests. After I set the max pool size, the application ran without any problems. IIS 7.5 / ASP.Net

Python float to int conversion

What Every Computer Scientist Should Know About Floating-Point Arithmetic

Floating-point numbers cannot represent all the numbers. In particular, 2.51 cannot be represented by a floating-point number, and is represented by a number very close to it:

>>> print "%.16f" % 2.51
2.5099999999999998
>>> 2.51*100
250.99999999999997
>>> 4.02*100
401.99999999999994

If you use int, which truncates the numbers, you get:

250
401

Have a look at the Decimal type.

How to write a confusion matrix in Python?

A Dependency Free Multiclass Confusion Matrix

# A Simple Confusion Matrix Implementation
def confusionmatrix(actual, predicted, normalize = False):
    """
    Generate a confusion matrix for multiple classification
    @params:
        actual      - a list of integers or strings for known classes
        predicted   - a list of integers or strings for predicted classes
        normalize   - optional boolean for matrix normalization
    @return:
        matrix      - a 2-dimensional list of pairwise counts
    """
    unique = sorted(set(actual))
    matrix = [[0 for _ in unique] for _ in unique]
    imap   = {key: i for i, key in enumerate(unique)}
    # Generate Confusion Matrix
    for p, a in zip(predicted, actual):
        matrix[imap[p]][imap[a]] += 1
    # Matrix Normalization
    if normalize:
        sigma = sum([sum(matrix[imap[i]]) for i in unique])
        matrix = [row for row in map(lambda i: list(map(lambda j: j / sigma, i)), matrix)]
    return matrix

The approach here is to pair up the unique classes found in the actual vector into a 2-dimensional list. From there, we simply iterate through the zipped actual and predicted vectors and populate the counts using the indices to access the matrix positions.

Usage

cm = confusionmatrix(
    [1, 1, 2, 0, 1, 1, 2, 0, 0, 1], # actual
    [0, 1, 1, 0, 2, 1, 2, 2, 0, 2]  # predicted
)

# And The Output
print(cm)
[[2, 1, 0], [0, 2, 1], [1, 2, 1]]

Note: the actual classes are along the columns and the predicted classes are along the rows.

# Actual
# 0  1  2
  #  #  #   
[[2, 1, 0], # 0
 [0, 2, 1], # 1  Predicted
 [1, 2, 1]] # 2

Class Names Can be Strings or Integers

cm = confusionmatrix(
    ["B", "B", "C", "A", "B", "B", "C", "A", "A", "B"], # actual
    ["A", "B", "B", "A", "C", "B", "C", "C", "A", "C"]  # predicted
)

# And The Output
print(cm)
[[2, 1, 0], [0, 2, 1], [1, 2, 1]]

You Can Also Return The Matrix With Proportions (Normalization)

cm = confusionmatrix(
    ["B", "B", "C", "A", "B", "B", "C", "A", "A", "B"], # actual
    ["A", "B", "B", "A", "C", "B", "C", "C", "A", "C"], # predicted
    normalize = True
)

# And The Output
print(cm)
[[0.2, 0.1, 0.0], [0.0, 0.2, 0.1], [0.1, 0.2, 0.1]]

A More Robust Solution

Since writing this post, I've updated my library implementation to be a class that uses a confusion matrix representation internally to compute statistics, in addition to pretty printing the confusion matrix itself. See this Gist.

Example Usage

# Actual & Predicted Classes
actual      = ["A", "B", "C", "C", "B", "C", "C", "B", "A", "A", "B", "A", "B", "C", "A", "B", "C"]
predicted   = ["A", "B", "B", "C", "A", "C", "A", "B", "C", "A", "B", "B", "B", "C", "A", "A", "C"]

# Initialize Performance Class
performance = Performance(actual, predicted)

# Print Confusion Matrix
performance.tabulate()

With the output:

===================================
        A?      B?      C?

A?      3       2       1

B?      1       4       1

C?      1       0       4

Note: class? = Predicted, class? = Actual
===================================

And for the normalized matrix:

# Print Normalized Confusion Matrix
performance.tabulate(normalized = True)

With the normalized output:

===================================
        A?      B?      C?

A?      17.65%  11.76%  5.88%

B?      5.88%   23.53%  5.88%

C?      5.88%   0.00%   23.53%

Note: class? = Predicted, class? = Actual
===================================

How do I get total physical memory size using PowerShell without WMI?

Maybe not the best solution, but it worked for me.

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.VisualBasic")
$VBObject=[Microsoft.VisualBasic.Devices.ComputerInfo]::new()
$SystemMemory=$VBObject.TotalPhysicalMemory

How to get content body from a httpclient call?

The way you are using await/async is poor at best, and it makes it hard to follow. You are mixing await with Task'1.Result, which is just confusing. However, it looks like you are looking at a final task result, rather than the contents.

I've rewritten your function and function call, which should fix your issue:

async Task<string> GetResponseString(string text)
{
    var httpClient = new HttpClient();

    var parameters = new Dictionary<string, string>();
    parameters["text"] = text;

    var response = await httpClient.PostAsync(BaseUri, new FormUrlEncodedContent(parameters));
    var contents = await response.Content.ReadAsStringAsync();

    return contents;
}

And your final function call:

Task<string> result = GetResponseString(text);
var finalResult = result.Result;

Or even better:

var finalResult = await GetResponseString(text);

How to return a resolved promise from an AngularJS Service using $q?

From your service method:

function serviceMethod() {
    return $timeout(function() {
        return {
            property: 'value'
        };
    }, 1000);
}

And in your controller:

serviceName
    .serviceMethod()
    .then(function(data){
        //handle the success condition here
        var x = data.property
    });

How to get the cell value by column name not by index in GridView in asp.net

GridView does not act as column names, as that's it's datasource property to know those things.

If you still need to know the index given a column name, then you can create a helper method to do this as the gridview Header normally contains this information.

int GetColumnIndexByName(GridViewRow row, string columnName)
{
    int columnIndex = 0;
    foreach (DataControlFieldCell cell in row.Cells)
    {
        if (cell.ContainingField is BoundField)
            if (((BoundField)cell.ContainingField).DataField.Equals(columnName))
                break;
        columnIndex++; // keep adding 1 while we don't have the correct name
    }
    return columnIndex;
}

remember that the code above will use a BoundField... then use it like:

protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        int index = GetColumnIndexByName(e.Row, "myDataField");
        string columnValue = e.Row.Cells[index].Text;
    }
}

I would strongly suggest that you use the TemplateField to have your own controls, then it's easier to grab those controls like:

<asp:GridView ID="gv" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

and then use

string columnValue = ((Label)e.Row.FindControl("lblName")).Text;

SQL query to make all data in a column UPPER CASE?

Permanent:

UPDATE
  MyTable
SET
  MyColumn = UPPER(MyColumn)

Temporary:

SELECT
  UPPER(MyColumn) AS MyColumn
FROM
  MyTable

How do you use global variables or constant values in Ruby?

One of the reasons why the global variable needs a prefix (called a "sigil") is because in Ruby, unlike in C, you don't have to declare your variables before assigning to them. The sigil is used as a way to be explicit about the scope of the variable.

Without a specific prefix for globals, given a statement pointNew = offset + point inside your draw method then offset refers to a local variable inside the method (and results in a NameError in this case). The same for @ used to refer to instance variables and @@ for class variables.

In other languages that use explicit declarations such as C, Java etc. the placement of the declaration is used to control the scope.

Firefox setting to enable cross domain Ajax request

To allow cross domain:

  1. enter about:config
  2. accept to be careful
  3. enter security.fileuri.strict_origin_policy in the search bar
  4. change to false

You can now close the tab. Normally you can now make cross domain request with this config.

See here for more details.

Page redirect with successful Ajax request

In your mail3.php file you should trap errors in a try {} catch {}

try {
    /*code here for email*/
} catch (Exception $e) {
    header('HTTP/1.1 500 Internal Server Error');
}

Then in your success call you wont have to worry about your errors, because it will never return as a success.

and you can use: window.location.href = "thankyou.php"; inside your success function like Nick stated.

Wait some seconds without blocking UI execution

I think what you are after is Task.Delay. This doesn't block the thread like Sleep does and it means you can do this using a single thread using the async programming model.

async Task PutTaskDelay()
{
    await Task.Delay(5000);
} 

private async void btnTaskDelay_Click(object sender, EventArgs e)
{
    await PutTaskDelay();
    MessageBox.Show("I am back");
}

Drop a temporary table if it exists

What you asked for is:

IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD') IS NOT NULL
    BEGIN
       DROP TABLE ##CLIENTS_KEYWORD

       CREATE TABLE ##CLIENTS_KEYWORD(client_id int)

    END
ELSE
   CREATE TABLE ##CLIENTS_KEYWORD(client_id int) 

IF OBJECT_ID('tempdb..##TEMP_CLIENTS_KEYWORD') IS NOT NULL
    BEGIN
       DROP TABLE ##TEMP_CLIENTS_KEYWORD

       CREATE TABLE ##TEMP_CLIENTS_KEYWORD(client_id int)

    END
ELSE
   CREATE TABLE ##TEMP_CLIENTS_KEYWORD(client_id int) 

Since you're always going to create the table, regardless of whether the table is deleted or not; a slightly optimised solution is:

IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD') IS NOT NULL
   DROP TABLE ##CLIENTS_KEYWORD

CREATE TABLE ##CLIENTS_KEYWORD(client_id int) 

IF OBJECT_ID('tempdb..##TEMP_CLIENTS_KEYWORD') IS NOT NULL
   DROP TABLE ##TEMP_CLIENTS_KEYWORD

CREATE TABLE ##TEMP_CLIENTS_KEYWORD(client_id int) 

Find file in directory from command line

When I was in the UNIX world (using tcsh (sigh...)), I used to have all sorts of "find" aliases/scripts setup for searching for files. I think the default "find" syntax is a little clunky, so I used to have aliases/scripts to pipe "find . -print" into grep, which allows you to use regular expressions for searching:

# finds all .java files starting in current directory
find . -print | grep '\.java'

#finds all .java files whose name contains "Message"
find . -print | grep '.*Message.*\.java'

Of course, the above examples can be done with plain-old find, but if you have a more specific search, grep can help quite a bit. This works pretty well, unless "find . -print" has too many directories to recurse through... then it gets pretty slow. (for example, you wouldn't want to do this starting in root "/")

Get the current script file name

Try This

$current_file_name = $_SERVER['PHP_SELF'];
echo $current_file_name;

How to automatically convert strongly typed enum into int?

Hope this helps you or someone else

enum class EnumClass : int //set size for enum
{
    Zero, One, Two, Three, Four
};

union Union //This will allow us to convert
{
    EnumClass ec;
    int i;
};

int main()
{
using namespace std;

//convert from strongly typed enum to int

Union un2;
un2.ec = EnumClass::Three;

cout << "un2.i = " << un2.i << endl;

//convert from int to strongly typed enum
Union un;
un.i = 0; 

if(un.ec == EnumClass::Zero) cout << "True" << endl;

return 0;
}

Decode UTF-8 with Javascript

Perhaps using the textDecoder will be sufficient.

Not supported in IE though.

var decoder = new TextDecoder('utf-8'),
    decodedMessage;

decodedMessage = decoder.decode(message.data);

Handling non-UTF8 text

In this example, we decode the Russian text "??????, ???!", which means "Hello, world." In our TextDecoder() constructor, we specify the Windows-1251 character encoding, which is appropriate for Cyrillic script.

_x000D_
_x000D_
    let win1251decoder = new TextDecoder('windows-1251');
    let bytes = new Uint8Array([207, 240, 232, 226, 229, 242, 44, 32, 236, 232, 240, 33]);
    console.log(win1251decoder.decode(bytes)); // ??????, ???!
_x000D_
_x000D_
_x000D_

The interface for the TextDecoder is described here.

Retrieving a byte array from a string is equally simpel:

_x000D_
_x000D_
const decoder = new TextDecoder();
const encoder = new TextEncoder();

const byteArray = encoder.encode('Größe');
// converted it to a byte array

// now we can decode it back to a string if desired
console.log(decoder.decode(byteArray));
_x000D_
_x000D_
_x000D_

If you have it in a different encoding then you must compensate for that upon encoding. The parameter in the constructor for the TextEncoder is any one of the valid encodings listed here.

Copy Data from a table in one Database to another separate database

This works successfully.

INSERT INTO DestinationDB.dbo.DestinationTable (col1,col1)
 SELECT Src-col1,Src-col2 FROM SourceDB.dbo.SourceTable

Git: Permission denied (publickey) fatal - Could not read from remote repository. while cloning Git repository

While cloning, I had a similar issue [ my ERROR: Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights .. etc ]

-- I was using bitBucket/UBUNTU14.04 in my case, but ALREADY had a set of key files that I had previously generated AND I had changed the name of the files. I simply COPIED the files to the standard id_rsa & id_rsa.pub name format. I then re-ran the command with out issue.

OBTW: I could have also used the password prompt by using the HTTP style clone.

curl -GET and -X GET

The use of -X [WHATEVER] merely changes the request's method string used in the HTTP request. This is easier to understand with two examples — one with -X [WHATEVER] and one without — and the associated HTTP request headers for each:

# curl -XPANTS -o nul -v http://neverssl.com/
* Connected to neverssl.com (13.224.86.126) port 80 (#0)
> PANTS / HTTP/1.1
> Host: neverssl.com
> User-Agent: curl/7.42.0
> Accept: */*

# curl -o nul -v http://neverssl.com/
* Connected to neverssl.com (13.33.50.167) port 80 (#0)
> GET / HTTP/1.1
> Host: neverssl.com
> User-Agent: curl/7.42.0
> Accept: */*

getColor(int id) deprecated on Android 6.0 Marshmallow (API 23)

The best equivalent is using ContextCompat.getColor and ResourcesCompat.getColor . I made some extension functions for quick migration:

@ColorInt
fun Context.getColorCompat(@ColorRes colorRes: Int) = ContextCompat.getColor(this, colorRes)

@ColorInt
fun Fragment.getColorCompat(@ColorRes colorRes: Int) = activity!!.getColorCompat(colorRes)

@ColorInt
fun Resources.getColorCompat(@ColorRes colorRes: Int) = ResourcesCompat.getColor(this, colorRes, null)

How can I get the class name from a C++ object?

An improvement for @Chubsdad answer,

//main.cpp

using namespace std;

int main(){
A a;
a.run();
}

//A.h
class A{
public:
 A(){};
 void run();
}

//A.cpp
#include <iostream>
#include <typeinfo>
void A::run(){
   cout << (string)typeid(this).name();
}

Which will print:

class A*

How to use boolean datatype in C?

C99 has a bool type. To use it,

#include <stdbool.h>

reading from stdin in c++

You have not defined the variable input_line.

Add this:

string input_line;

And add this include.

#include <string>

Here is the full example. I also removed the semi-colon after the while loop, and you should have getline inside the while to properly detect the end of the stream.

#include <iostream>
#include <string>

int main() {
    for (std::string line; std::getline(std::cin, line);) {
        std::cout << line << std::endl;
    }
    return 0;
}

How to set value of input text using jQuery

In pure js it will be simpler

EmployeeId.value = 'fgg';

_x000D_
_x000D_
EmployeeId.value = 'fgg';
_x000D_
<div class="editor-label">_x000D_
  <label for="EmployeeId">Employee Number</label>_x000D_
</div>_x000D_
_x000D_
<div class="editor-field textBoxEmployeeNumber">_x000D_
  <input class="text-box single-line" data-val="true" data-val-number="The field EmployeeId must be a number." data-val-required="The EmployeeId field is required." id="EmployeeId" name="EmployeeId" type="text" value="" />_x000D_
  _x000D_
  <span class="field-validation-valid" data-valmsg-for="EmployeeId" data-valmsg-replace="true"></span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to calculate UILabel width based on text length?

The selected answer is correct for iOS 6 and below.

In iOS 7, sizeWithFont:constrainedToSize:lineBreakMode: has been deprecated. It is now recommended you use boundingRectWithSize:options:attributes:context:.

CGRect expectedLabelSize = [yourString boundingRectWithSize:sizeOfRect
                                                    options:<NSStringDrawingOptions>
                                                 attributes:@{
                                                    NSFontAttributeName: yourString.font
                                                    AnyOtherAttributes: valuesForAttributes
                                                 }
                                                    context:(NSStringDrawingContext *)];

Note that the return value is a CGRect not a CGSize. Hopefully that'll be of some assistance to people using it in iOS 7.

Read input from console in Ruby?

If you want to make interactive console:

#!/usr/bin/env ruby

require "readline"
addends = []
while addend_string = Readline.readline("> ", true)
  addends << addend_string.to_i
  puts "#{addends.join(' + ')} = #{addends.sum}"
end

Usage (assuming you put above snippet into summator file in current directory):

chmod +x summator
./summator
> 1
1 = 1
> 2
1 + 2 = 3

Use Ctrl + D to exit

QUERY syntax using cell reference

I found out that single quote > double quote > wrapped in ampersands did work. So, for me it looks like this:

=QUERY('Youth Conference Registration'!C:Y,"select C where Y = '"&A1&"'", 0)

How to assign a value to a TensorFlow variable?

I answered a similar question here. I looked in a lot of places that always created the same problem. Basically, I did not want to assign a value to the weights, but simply change the weights. The short version of the above answer is:

tf.keras.backend.set_value(tf_var, numpy_weights)

How To Use DateTimePicker In WPF?

There is no out of the box DateTime picker for WPF..

There are however a lot of third party DateTime pickers of course :)

http://www.devcomponents.com/dotnetbar-wpf/WPFDateTimePicker.aspx

http://marlongrech.wordpress.com/2007/09/11/wpf-datepicker/

http://www.codeplex.com/AvalonControlsLib

Just do a quick google to find more!

SQL where datetime column equals today's date?

There might be another way, but this should work:

SELECT [Title], [Firstname], [Surname], [Company_name], [Interest] 
FROM [dbo].[EXTRANET] 
WHERE day(Submission_date)=day(now) and 
     month(Submission_date)=month(now)
     and year(Submission_date)=year(now)

How do I set the default schema for a user in MySQL

If your user has a local folder e.g. Linux, in your users home folder you could create a .my.cnf file and provide the credentials to access the server there. for example:-

[client]
host=localhost
user=yourusername
password=yourpassword or exclude to force entry
database=mygotodb

Mysql would then open this file for each user account read the credentials and open the selected database.

Not sure on Windows, I upgraded from Windows because I needed the whole house not just the windows (aka Linux) a while back.

Deep-Learning Nan loss reasons

Regularization can help. For a classifier, there is a good case for activity regularization, whether it is binary or a multi-class classifier. For a regressor, kernel regularization might be more appropriate.

Update .NET web service to use TLS 1.2

For me below worked:

Step 1: Downloaded and installed the web Installer exe from https://www.microsoft.com/en-us/download/details.aspx?id=48137 on the application server. Rebooted the application server after installation was completed.

Step 2: Added below changes in the web.config

<system.web>
    <compilation targetFramework="4.6"/> <!-- Changed framework 4.0 to 4.6 -->
    <!--Added this httpRuntime -->
    <httpRuntime targetFramework="4.6" />
</system.web>

Step 3: After completing step 1 and 2, it gave an error, "WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive)" and to resolve this error, I added below key in appsettings in my web.config file

<appSettings>
      <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
</appSettings>

Make an existing Git branch track a remote branch?

For Git versions 1.8.0 and higher:

Actually for the accepted answer to work:

git remote add upstream <remote-url>
git fetch upstream
git branch -f --track qa upstream/qa
# OR Git version 1.8.0 and higher:
git branch --set-upstream-to=upstream/qa
# Gitversions lower than 1.8.0
git branch --set-upstream qa upstream/qa

how to align img inside the div to the right?

There are plenty of ways to align with CSS, each one has it's benefits and disadvantages, you could test them all to check which one fits your case better: http://www.w3schools.com/css/css_align.asp

TIP: Always search using W3 as extra word, that will give you in first places the resources of the W3school website or the w3.org if there's any relevant.

The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256

AWS4-HMAC-SHA256, also known as Signature Version 4, ("V4") is one of two authentication schemes supported by S3.

All regions support V4, but US-Standard¹, and many -- but not all -- other regions, also support the other, older scheme, Signature Version 2 ("V2").

According to http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html ... new S3 regions deployed after January, 2014 will only support V4.

Since Frankfurt was introduced late in 2014, it does not support V2, which is what this error suggests you are using.

http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingAWSSDK.html explains how to enable V4 in the various SDKs, assuming you are using an SDK that has that capability.

I would speculate that some older versions of the SDKs might not support this option, so if the above doesn't help, you may need a newer release of the SDK you are using.


¹US Standard is the former name for the S3 regional deployment that is based in the us-east-1 region. Since the time this answer was originally written, "Amazon S3 renamed the US Standard Region to the US East (N. Virginia) Region to be consistent with AWS regional naming conventions." For all practical purposes, it's only a change in naming.