#Canonical form | Programs & Examples on Canonical form

Is it possible to add an HTML link in the body of a MAILTO link

Please check below javascript in IE. Don't know if other modern browser will work or not.

<html>
    <head>
        <script type="text/javascript">
            function OpenOutlookDoc(){
                try {

                    var outlookApp = new ActiveXObject("Outlook.Application");
                    var nameSpace = outlookApp.getNameSpace("MAPI");
                    mailFolder = nameSpace.getDefaultFolder(6);
                    mailItem = mailFolder.Items.add('IPM.Note.FormA');
                    mailItem.Subject="a subject test";
                    mailItem.To = "[email protected]";
                    mailItem.HTMLBody = "<b>bold</b>";
                    mailItem.display (0); 
                }
                catch(e){
                    alert(e);
                    // act on any error that you get
                }
            }
        </script>
    </head>
    <body>
        <a href="javascript:OpenOutlookDoc()">Click</a>
    </body>
</html>

Why does Vim save files with a ~ extension?

To turn off those files, just add these lines to .vimrc (vim configuration file on unix based OS):

set nobackup       #no backup files
set nowritebackup  #only in case you don't want a backup file while editing
set noswapfile     #no swap files

React Native TextInput that only accepts numeric characters

I had the same problem in iOS, using the onChangeText event to update the value of the text typed by the user I was not being able to update the value of the TextInput, so the user would still see the non numeric characters that he typed.

This was because, when a non numeric character was pressed the state would not change since this.setState would be using the same number (the number that remained after removing the non numeric characters) and then the TextInput would not re render.

The only way I found to solve this was to use the keyPress event which happens before the onChangeText event, and in it, use setState to change the value of the state to another, completely different, forcing the re render when the onChangeText event was called. Not very happy with this but it worked.

What causes an HTTP 405 "invalid method (HTTP verb)" error when POSTing a form to PHP on IIS?

The acceptable verbs are controlled in web.config (found in the root of the website) in <system.web><httpHandlers> and possibly <webServices><protocols>. Web.config will be accessible to you if it exists. There is also a global server.config which probably won't. If you can get a look at either of these you may get a clue.

The acceptable verbs can differ with the content types - have you set Content-type headers in your page at all ? (i.e. if your Content-type was application/json then different verbs would be allowed)

Can overridden methods differ in return type?

class Phone {
    public Phone getMsg() {
        System.out.println("phone...");
        return new Phone();
    }
}

class Samsung extends Phone{
    @Override
    public Samsung getMsg() {
        System.out.println("samsung...");
        return new Samsung();
    }
    
    public static void main(String[] args) {
        Phone p=new Samsung();
        p.getMsg();
    }
}

How can you get the first digit in an int (C#)?

Check this one too:

int get1digit(Int64 myVal)
{
    string q12 = myVal.ToString()[0].ToString();
    int i = int.Parse(q12);
    return i;
}

Also good if you want multiple numbers:

int get3digit(Int64 myVal) //Int64 or whatever numerical data you have
{
    char mg1 = myVal.ToString()[0];
    char mg2 = myVal.ToString()[1];
    char mg3 = myVal.ToString()[2];
    char[] chars = { mg1, mg2, mg3 };
    string q12= new string(chars);
    int i = int.Parse(q12);
    return i;
}

Allowing the "Enter" key to press the submit button, as opposed to only using MouseClick

 switch(KEYEVENT.getKeyCode()){
      case KeyEvent.VK_ENTER:
           // I was trying to use case 13 from the ascii table.
           //Krewn Generated method stub... 
           break;
 }

Displaying splash screen for longer than default seconds

You can simple specify number of seconds to sleep in the AppDelegate didFinishLaunchingWithOptions method.

Or alternatively use another ImageView to customize the splash screen.

See details for the latter at the following link by me:

Splash Screen Problem

How can I hide an HTML table row <tr> so that it takes up no space?

This happened to me and I was baffled as to why. Then I noticed that if i removed any nbsp; i had within the rows, then the rows didn't take up any space.

Create empty data frame with column names by assigning a string vector?

How about:

df <- data.frame(matrix(ncol = 3, nrow = 0))
x <- c("name", "age", "gender")
colnames(df) <- x

To do all these operations in one-liner:

setNames(data.frame(matrix(ncol = 3, nrow = 0)), c("name", "age", "gender"))

#[1] name   age    gender
#<0 rows> (or 0-length row.names)

data.frame(matrix(ncol=3,nrow=0, dimnames=list(NULL, c("name", "age", "gender"))))

org.springframework.web.client.HttpClientErrorException: 400 Bad Request

This is what worked for me. Issue is earlier I didn't set Content Type(header) when I used exchange method.

MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
map.add("param1", "123");
map.add("param2", "456");
map.add("param3", "789");
map.add("param4", "123");
map.add("param5", "456");

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

final HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<MultiValueMap<String, String>>(map ,
        headers);
JSONObject jsonObject = null;

try {
    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<String> responseEntity = restTemplate.exchange(
            "https://url", HttpMethod.POST, entity,
            String.class);

    if (responseEntity.getStatusCode() == HttpStatus.CREATED) {
        try {
            jsonObject = new JSONObject(responseEntity.getBody());
        } catch (JSONException e) {
            throw new RuntimeException("JSONException occurred");
        }
    }
  } catch (final HttpClientErrorException httpClientErrorException) {
        throw new ExternalCallBadRequestException();
  } catch (HttpServerErrorException httpServerErrorException) {
        throw new ExternalCallServerErrorException(httpServerErrorException);
  } catch (Exception exception) {
        throw new ExternalCallServerErrorException(exception);
    }

ExternalCallBadRequestException and ExternalCallServerErrorException are the custom exceptions here.

Note: Remember HttpClientErrorException is thrown when a 4xx error is received. So if the request you send is wrong either setting header or sending wrong data, you could receive this exception.

trying to animate a constraint in swift

It's very important to point out that view.layoutIfNeeded() applies to the view subviews only.

Therefore to animate the view constraint, it is important to call it on the view-to-animate superview as follows:

    topConstraint.constant = heightShift

    UIView.animate(withDuration: 0.3) {

        // request layout on the *superview*
        self.view.superview?.layoutIfNeeded()
    }

An example for a simple layout as follows:

class MyClass {

    /// Container view
    let container = UIView()
        /// View attached to container
        let view = UIView()

    /// Top constraint to animate
    var topConstraint = NSLayoutConstraint()


    /// Create the UI hierarchy and constraints
    func createUI() {
        container.addSubview(view)

        // Create the top constraint
        topConstraint = view.topAnchor.constraint(equalTo: container.topAnchor, constant: 0)


        view.translatesAutoresizingMaskIntoConstraints = false

        // Activate constaint(s)
        NSLayoutConstraint.activate([
           topConstraint,
        ])
    }

    /// Update view constraint with animation
    func updateConstraint(heightShift: CGFloat) {
        topConstraint.constant = heightShift

        UIView.animate(withDuration: 0.3) {

            // request layout on the *superview*
            self.view.superview?.layoutIfNeeded()
        }
    }
}

python getoutput() equivalent in subprocess

To catch errors with subprocess.check_output(), you can use CalledProcessError. If you want to use the output as string, decode it from the bytecode.

# \return String of the output, stripped from whitespace at right side; or None on failure.
def runls():
    import subprocess
    try:
        byteOutput = subprocess.check_output(['ls', '-a'], timeout=2)
        return byteOutput.decode('UTF-8').rstrip()
    except subprocess.CalledProcessError as e:
        print("Error in ls -a:\n", e.output)
        return None

Is try-catch like error handling possible in ASP Classic?

Been a while since I was in ASP land, but iirc there's a couple of ways:

try catch finally can be reasonably simulated in VBS (good article ~~here~~ here) and there's an event called class_terminate you can watch and catch exceptions globally in. Then there's the possibility of changing your scripting language...

How to set up subdomains on IIS 7

If your computer can't find the IP address associated with SUBDOMAIN1.example.COM, it will not find the site.

You need to either change your hosts file (so you can at least test things - this will be a local change, only available to yourself), or update DNS so the name will resolve correctly (so the rest of the world can see it).

Pandas sort by group aggregate and column

Groupby A:

In [0]: grp = df.groupby('A')

Within each group, sum over B and broadcast the values using transform. Then sort by B:

In [1]: grp[['B']].transform(sum).sort('B')
Out[1]:
          B
2 -2.829710
5 -2.829710
1  0.253651
4  0.253651
0  0.551377
3  0.551377

Index the original df by passing the index from above. This will re-order the A values by the aggregate sum of the B values:

In [2]: sort1 = df.ix[grp[['B']].transform(sum).sort('B').index]

In [3]: sort1
Out[3]:
     A         B      C
2  baz -0.528172  False
5  baz -2.301539   True
1  bar -0.611756   True
4  bar  0.865408  False
0  foo  1.624345  False
3  foo -1.072969   True

Finally, sort the 'C' values within groups of 'A' using the sort=False option to preserve the A sort order from step 1:

In [4]: f = lambda x: x.sort('C', ascending=False)

In [5]: sort2 = sort1.groupby('A', sort=False).apply(f)

In [6]: sort2
Out[6]:
         A         B      C
A
baz 5  baz -2.301539   True
    2  baz -0.528172  False
bar 1  bar -0.611756   True
    4  bar  0.865408  False
foo 3  foo -1.072969   True
    0  foo  1.624345  False

Clean up the df index by using reset_index with drop=True:

In [7]: sort2.reset_index(0, drop=True)
Out[7]:
     A         B      C
5  baz -2.301539   True
2  baz -0.528172  False
1  bar -0.611756   True
4  bar  0.865408  False
3  foo -1.072969   True
0  foo  1.624345  False

Safely casting long to int in Java

DONT: This is not a solution!

My first approach was:

public int longToInt(long theLongOne) {
  return Long.valueOf(theLongOne).intValue();
}

But that merely just casts the long to an int, potentially creating new Long instances or retrieving them from the Long pool.

The drawbacks

Long.valueOf creates a new Long instance if the number is not within Long's pool range [-128, 127].
The intValue implementation does nothing more than:
```
return (int)value;
```

So this can be considered even worse than just casting the long to int.

Catching access violation exceptions?

Read it and weep!

I figured it out. If you don't throw from the handler, the handler will just continue and so will the exception.

The magic happens when you throw you own exception and handle that.

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <tchar.h>

void SignalHandler(int signal)
{
    printf("Signal %d",signal);
    throw "!Access Violation!";
}

int main()
{
    typedef void (*SignalHandlerPointer)(int);

    SignalHandlerPointer previousHandler;
    previousHandler = signal(SIGSEGV , SignalHandler);
    try{
        *(int *) 0 = 0;// Baaaaaaad thing that should never be caught. You should write good code in the first place.
    }
    catch(char *e)
    {
        printf("Exception Caught: %s\n",e);
    }
    printf("Now we continue, unhindered, like the abomination never happened. (I am an EVIL genius)\n");
    printf("But please kids, DONT TRY THIS AT HOME ;)\n");

}

Removing single-quote from a string in php

I used this function htmlspecialchars for alt attributes in images

Unable to Build using MAVEN with ERROR - Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile

I was getting similar errors and eventually found just that cleaning the build folder resolved my issue.

mvn clean install

Link vs compile vs controller

Compile :

This is the phase where Angular actually compiles your directive. This compile function is called just once for each references to the given directive. For example, say you are using the ng-repeat directive. ng-repeat will have to look up the element it is attached to, extract the html fragment that it is attached to and create a template function.

If you have used HandleBars, underscore templates or equivalent, its like compiling their templates to extract out a template function. To this template function you pass data and the return value of that function is the html with the data in the right places.

The compilation phase is that step in Angular which returns the template function. This template function in angular is called the linking function.

Linking phase :

The linking phase is where you attach the data ( $scope ) to the linking function and it should return you the linked html. Since the directive also specifies where this html goes or what it changes, it is already good to go. This is the function where you want to make changes to the linked html, i.e the html that already has the data attached to it. In angular if you write code in the linking function its generally the post-link function (by default). It is kind of a callback that gets called after the linking function has linked the data with the template.

Controller :

The controller is a place where you put in some directive specific logic. This logic can go into the linking function as well, but then you would have to put that logic on the scope to make it "shareable". The problem with that is that you would then be corrupting the scope with your directives stuff which is not really something that is expected. So what is the alternative if two Directives want to talk to each other / co-operate with each other? Ofcourse you could put all that logic into a service and then make both these directives depend on that service but that just brings in one more dependency. The alternative is to provide a Controller for this scope ( usually isolate scope ? ) and then this controller is injected into another directive when that directive "requires" the other one. See tabs and panes on the first page of angularjs.org for an example.

Does Python have a string 'contains' substring method?

if needle in haystack: is the normal use, as @Michael says -- it relies on the in operator, more readable and faster than a method call.

If you truly need a method instead of an operator (e.g. to do some weird key= for a very peculiar sort...?), that would be 'haystack'.__contains__. But since your example is for use in an if, I guess you don't really mean what you say;-). It's not good form (nor readable, nor efficient) to use special methods directly -- they're meant to be used, instead, through the operators and builtins that delegate to them.

Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio

You would mostly be using COUNT to summarize over a UID. Therefore

COUNT([uid]) will produce the warning:

Warning: Null value is eliminated by an aggregate or other SET operation.

whilst being used with a left join, where the counted object does not exist.

Using COUNT(*) in this case would also render incorrect results, as you would then be counting the total number of results (ie parents) that exist.

Using COUNT([uid]) IS a valid way of counting, and the warning is nothing more than a warning. However if you are concerned, and you want to get a true count of uids in this case then you could use:

SUM(CASE WHEN [uid] IS NULL THEN 0 ELSE 1 END) AS [new_count]

This would not add a lot of overheads to your query. (tested mssql 2008)

List method to delete last element in list as well as all elements

To delete the last element of the lists, you could use:

def deleteLast(self):
    if self.Ans:
        del self.Ans[-1]
    if self.masses:
        del self.masses[-1]

How to change the current URL in javascript?

Your example wasn't working because you are trying to add 1 to a string that looks like this: "1.html". That will just get you this "1.html1" which is not what you want. You have to isolate the numeric part of the string and then convert it to an actual number before you can do math on it. After getting it to an actual number, you can then increase its value and then combine it back with the rest of the string.

You can use a custom replace function like this to isolate the various pieces of the original URL and replace the number with an incremented number:

function nextImage() {
    return(window.location.href.replace(/(\d+)(\.html)$/, function(str, p1, p2) {
        return((Number(p1) + 1) + p2);
    }));
}

You can then call it like this:

window.location.href = nextImage();

Demo here: http://jsfiddle.net/jfriend00/3VPEq/

This will work for any URL that ends in some series of digits followed by .html and if you needed a slightly different URL form, you could just tweak the regular expression.

Pandas Split Dataframe into two Dataframes at a specific row

use np.split(..., axis=1):

Demo:

In [255]: df = pd.DataFrame(np.random.rand(5, 6), columns=list('abcdef'))

In [256]: df
Out[256]:
          a         b         c         d         e         f
0  0.823638  0.767999  0.460358  0.034578  0.592420  0.776803
1  0.344320  0.754412  0.274944  0.545039  0.031752  0.784564
2  0.238826  0.610893  0.861127  0.189441  0.294646  0.557034
3  0.478562  0.571750  0.116209  0.534039  0.869545  0.855520
4  0.130601  0.678583  0.157052  0.899672  0.093976  0.268974

In [257]: dfs = np.split(df, [4], axis=1)

In [258]: dfs[0]
Out[258]:
          a         b         c         d
0  0.823638  0.767999  0.460358  0.034578
1  0.344320  0.754412  0.274944  0.545039
2  0.238826  0.610893  0.861127  0.189441
3  0.478562  0.571750  0.116209  0.534039
4  0.130601  0.678583  0.157052  0.899672

In [259]: dfs[1]
Out[259]:
          e         f
0  0.592420  0.776803
1  0.031752  0.784564
2  0.294646  0.557034
3  0.869545  0.855520
4  0.093976  0.268974

np.split() is pretty flexible - let's split an original DF into 3 DFs at columns with indexes [2,3]:

In [260]: dfs = np.split(df, [2,3], axis=1)

In [261]: dfs[0]
Out[261]:
          a         b
0  0.823638  0.767999
1  0.344320  0.754412
2  0.238826  0.610893
3  0.478562  0.571750
4  0.130601  0.678583

In [262]: dfs[1]
Out[262]:
          c
0  0.460358
1  0.274944
2  0.861127
3  0.116209
4  0.157052

In [263]: dfs[2]
Out[263]:
          d         e         f
0  0.034578  0.592420  0.776803
1  0.545039  0.031752  0.784564
2  0.189441  0.294646  0.557034
3  0.534039  0.869545  0.855520
4  0.899672  0.093976  0.268974

Does the join order matter in SQL?

Oracle optimizer chooses join order of tables for inner join. Optimizer chooses the join order of tables only in simple FROM clauses . U can check the oracle documentation in their website. And for the left, right outer join the most voted answer is right. The optimizer chooses the optimal join order as well as the optimal index for each table. The join order can affect which index is the best choice. The optimizer can choose an index as the access path for a table if it is the inner table, but not if it is the outer table (and there are no further qualifications).

The optimizer chooses the join order of tables only in simple FROM clauses. Most joins using the JOIN keyword are flattened into simple joins, so the optimizer chooses their join order.

The optimizer does not choose the join order for outer joins; it uses the order specified in the statement.

When selecting a join order, the optimizer takes into account: The size of each table The indexes available on each table Whether an index on a table is useful in a particular join order The number of rows and pages to be scanned for each table in each join order

NSString with \n or line break

Line breaks character for NSString is \r

correct way to use [NSString StringWithFormat:@"%@\r%@",string1,string2];

\r ----> carriage return

Have log4net use application config file for configuration data

From the config shown in the question there is but one appender configured and it is named "EventLogAppender". But in the config for root, the author references an appender named "ConsoleAppender", hence the error message.

How can I check if a Perl module is installed on my system from the command line?

I believe your solution will only look in the root of each directory path contained in the @INC array. You need something recursive, like:

 perl -e 'foreach (@INC) {
    print `find $_ -type f -name "*.pm"`;
 }'

Declare global variables in Visual Studio 2010 and VB.NET

The first guy with a public class makes a lot more sense. The original guy has multiple forms and if global variables are needed then the global class will be better. Think of someone coding behind him and needs to use a global variable in a class you have IntelliSense, it will also make coding a modification 6 months later a lot easier.

Also if I have a brain fart and use like in an example parts on a module level then want my global parts I can do something like

Dim Parts as Integer
parts = 3
GlobalVariables.parts += Parts  '< Not recommended but it works

At least that's why I would go the class route.

Best way to format integer as string with leading zeros?

A straightforward conversion would be (again with a function):

def add_nulls2(int, cnt):
    nulls = str(int)
    for i in range(cnt - len(str(int))):
        nulls = '0' + nulls
    return nulls

Retrieve WordPress root directory path?

Looking at the bottom of your wp-config.php file in the wordpress root directory will let you find something like this:

if ( !defined('ABSPATH') )
    define('ABSPATH', dirname(__FILE__) . '/');

For an example file have a look here:
http://core.trac.wordpress.org/browser/trunk/wp-config-sample.php

You can make use of this constant called ABSPATH in other places of your wordpress scripts and in most cases it should point to your wordpress root directory.

Run Button is Disabled in Android Studio

I'm using Linux where I had a symlink in my home folder pointing to a folder containing the Android Studio projects. Loading a project using the symlink failed, loading a project from the folder where the symlink is pointing to worked!

Jenkins - How to access BUILD_NUMBER environment variable

For Groovy script in the Jenkinsfile using the $BUILD_NUMBER it works.

Can Windows' built-in ZIP compression be scripted?

to create a compressed archive you can use the utility MAKECAB.EXE

Remove a data connection from an Excel 2010 spreadsheet in compatibility mode

I have experienced that a drop-down menu, referring to a control range (for example after copying sheets from one workbook to another), will keep that cell reference after copying the worksheet, and keeps a data connection which is invisible in "Connections". I found this in the "Search" menu in the ribbon, where an arrow can be selected to mark objects. Underneath the arrow is a menu selection to see all the objects listed in a panel. Then you can delete those unwanted objects and the data source/connection is gone...

How to get text with Selenium WebDriver in Python

You can use:

element = driver.find_element_by_class_name("class_name").text

This will return the text within the element and will allow you to verify it after that.

Create a user with all privileges in Oracle

My issue was, i am unable to create a view with my "scott" user in oracle 11g edition. So here is my solution for this

Error in my case

SQL>create view v1 as select * from books where id=10;

insufficient privileges.

Solution

1)open your cmd and change your directory to where you install your oracle database. in my case i was downloaded in E drive so my location is E:\app\B_Amar\product\11.2.0\dbhome_1\BIN> after reaching in the position you have to type sqlplus sys as sysdba

E:\app\B_Amar\product\11.2.0\dbhome_1\BIN>sqlplus sys as sysdba

2) Enter password: here you have to type that password that you give at the time of installation of oracle software.

3) Here in this step if you want create a new user then you can create otherwise give all the privileges to existing user.

for creating new user

SQL> create user abc identified by xyz;

here abc is user and xyz is password.

giving all the privileges to abc user

SQL> grant all privileges to abc;

 grant succeeded.

if you are seen this message then all the privileges are giving to the abc user.

4) Now exit from cmd, go to your SQL PLUS and connect to the user i.e enter your username & password.Now you can happily create view.

In My case

in cmd E:\app\B_Amar\product\11.2.0\dbhome_1\BIN>sqlplus sys as sysdba

SQL> grant all privileges to SCOTT;

grant succeeded.

Now I can create views.

What are native methods in Java and where should they be used?

Native methods allow you to use code from other languages such as C or C++ in your java code. You use them when java doesn't provide the functionality that you need. For example, if I were writing a program to calculate some equation and create a line graph of it, I would use java, because it is the language I am best in. However, I am also proficient in C. Say in part of my program I need to calculate a really complex equation. I would use a native method for this, because I know some C++ and I know that C++ is much faster than java, so if I wrote my method in C++ it would be quicker. Also, say I want to interact with another program or device. This would also use a native method, because C++ has something called pointers, which would let me do that.

"The certificate chain was issued by an authority that is not trusted" when connecting DB in VM Role from Azure website

I got this Issue while importing Excel data into SQLDatabase through SSMS. The solution is to set TrustServerCertificate = True in the security section

Html.EditorFor Set Default Value

Here's what I've found:

@Html.TextBoxFor(c => c.Propertyname, new { @Value = "5" })

works with a capital V, not a lower case v (the assumption being value is a keyword used in setters typically) Lower vs upper value

@Html.EditorFor(c => c.Propertyname, new { @Value = "5" })

does not work

Your code ends up looking like this though

<input Value="5" id="Propertyname" name="Propertyname" type="text" value="" />

Value vs. value. Not sure I'd be too fond of that.

Why not just check in the controller action if the proprety has a value or not and if it doesn't just set it there in your view model to your defaulted value and let it bind so as to avoid all this monkey work in the view?

How can I find a specific element in a List<T>?

Try:

 list.Find(item => item.id==myid);

Is there a simple way to convert C++ enum to string?

Note that your conversion function should ideally be returning a const char *.

If you can afford to put your enums in their separate header files, you could perhaps do something like this with macros (oh, this will be ugly):

#include "enum_def.h"
#include "colour.h"
#include "enum_conv.h"
#include "colour.h"

Where enum_def.h has:

#undef ENUM_START
#undef ENUM_ADD
#undef ENUM_END
#define ENUM_START(NAME) enum NAME {
#define ENUM_ADD(NAME, VALUE) NAME = VALUE,
#define ENUM_END };

And enum_conv.h has:

#undef ENUM_START
#undef ENUM_ADD
#undef ENUM_END
#define ENUM_START(NAME) const char *##NAME##_to_string(NAME val) { switch (val) {
#define ENUM_ADD(NAME, VALUE) case NAME: return #NAME;
#define ENUM_END default: return "Invalid value"; } }

And finally, colour.h has:

ENUM_START(colour)
ENUM_ADD(red,   0xff0000)
ENUM_ADD(green, 0x00ff00)
ENUM_ADD(blue,  0x0000ff)
ENUM_END

And you can use the conversion function as:

printf("%s", colour_to_string(colour::red));

This is ugly, but it's the only way (at the preprocessor level) that lets you define your enum just in a single place in your code. Your code is therefore not prone to errors due to modifications to the enum. Your enum definition and the conversion function will always be in sync. However, I repeat, this is ugly :)

How to post query parameters with Axios?

axios signature for post is axios.post(url[, data[, config]]). So you want to send params object within the third argument:

.post(`/mails/users/sendVerificationMail`, null, { params: {
  mail,
  firstname
}})
.then(response => response.status)
.catch(err => console.warn(err));

This will POST an empty body with the two query params:

POST http://localhost:8000/api/mails/users/sendVerificationMail?mail=lol%40lol.com&firstname=myFirstName

Verify object attribute value with mockito

The solutions above didn't really work in my case. I couldn't use ArgumentCaptor as the method was called several times and I needed to validate each one. A simple Matcher with "argThat" did the trick easily.

Custom Matcher

// custom matcher
private class PolygonMatcher extends ArgumentMatcher<PolygonOptions> {
    private int fillColor;
    public PolygonMatcher(int fillColor) {
        this.fillColor = fillColor;
    }

    @Override
    public boolean matches(Object argument) {
        if (!(argument instanceof PolygonOptions)) return false;
        PolygonOptions arg = (PolygonOptions)argument;
        return Color.red(arg.getFillColor()) == Color.red(fillColor)
                && Color.green(arg.getFillColor()) == Color.green(fillColor)
                && Color.blue(arg.getFillColor()) == Color.blue(fillColor);
    }
}

Test Runner

// do setup work setup
// 3 light green polygons
int green = getContext().getResources().getColor(R.color.dmb_rx_bucket1);
verify(map, times(3)).addPolygon(argThat(new PolygonMatcher(green)));

// 1 medium yellow polygons
int yellow = getContext().getResources().getColor(R.color.dmb_rx_bucket4);
    verify(map, times(1)).addPolygon(argThat(new PolygonMatcher(yellow)));

// 3 red polygons
int orange = getContext().getResources().getColor(R.color.dmb_rx_bucket5);
verify(map, times(3)).addPolygon(argThat(new PolygonMatcher(orange)));

// 2 red polygons
int red = getContext().getResources().getColor(R.color.dmb_rx_bucket7);
verify(map, times(2)).addPolygon(argThat(new PolygonMatcher(red)));

Secure random token in Node.js

Try crypto.randomBytes():

require('crypto').randomBytes(48, function(err, buffer) {
  var token = buffer.toString('hex');
});

The 'hex' encoding works in node v0.6.x or newer.

How to host material icons offline?

I have tried to compile everything that needs to be done for self-hosting icons in my answer. You need to follow these 4 simple steps.

Open the iconfont folder of the materialize repository

link- https://github.com/google/material-design-icons/tree/master/iconfont
Download these three icons files ->

MaterialIcons-Regular.woff2 - format('woff2')

MaterialIcons-Regular.woff - format('woff')

MaterialIcons-Regular.ttf - format('truetype');

Note- After Download you can rename it to whatever you like.
Now, go to your CSS and add this code

_x000D_

@font-face {
  font-family: 'Material Icons';
  font-style: normal;
  font-weight: 400;
  src: url(MaterialIcons-Regular.eot); /* For IE6-8 */
  src: local('Material Icons'),
       local('MaterialIcons-Regular'),
       url(MaterialIcons-Regular.woff2) format('woff2'),
       url(MaterialIcons-Regular.woff) format('woff'),
       url(MaterialIcons-Regular.ttf) format('truetype');
}

.material-icons {
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;  /* Preferred icon size */
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;

  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;

  /* Support for Firefox. */
  -moz-osx-font-smoothing: grayscale;

  /* Support for IE. */
  font-feature-settings: 'liga';
}

_x000D_

Note : The address provided in src:url(...) should be with respect to the 'CSS File' and not the index.html file. For example it can be src : url(../myicons/MaterialIcons-Regular.woff2)

You are ready to use now and here is how it can be done in HTML

_x000D_

<i class="material-icons">face</i>

_x000D_

Click here to see all the icons that can be used.

What do I need to do to get Internet Explorer 8 to accept a self signed certificate?

How to install the CA Root Cert, and not the Website Cert: (IE8, Win7)

When you bring up the certificate details you are looking at the website cert, and not the CA cert. The General tab will say, "This certificate cannot be verified..." You need to select the CA by clicking on the Certification Path tab, and selecting the top most cert in the path. It should have a red X icon, and should say, "This CA Root certificate is not trusted because..." Click the View Certificate button, and on this new General tab you should see, "This CA Root is not trusted..." This is the certificate that you want to import into the Trusted Root Certificate Authority.

Once you have imported the CA, you do not need to import the regular website cert. That cert will get matched up to the CA you just imported, and IE will treat everything as working normally. You do not need to run IE as Admin, and you do not need to add the site to trusted sites first. You do need to restart IE after the import.

Javascript ajax call on page onload

Or with Prototype:

Event.observe(this, 'load', function() { new Ajax.Request(... ) );

Or better, define the function elsewhere rather than inline, then:

Event.observe(this, 'load', functionName );

You don't have to use jQuery or Prototype specifically, but I hope you're using some kind of library. Either library is going to handle the event handling in a more consistent manner than onload, and of course is going to make it much easier to process the Ajax call. If you must use the body onload attribute, then you should just be able to call the same function as referenced in these examples (onload="javascript:functionName();").

However, if your database update doesn't depend on the rendering on the page, why wait until it's fully loaded? You could just include a call to the Ajax-calling function at the end of the JavaScript on the page, which should give nearly the same effect.

SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'

The error message tells you exactly what's wrong. The Python interpreter needs to know the encoding of the non-ASCII character.

If you want to return U+00A3 then you can say

return u'\u00a3'

which represents this character in pure ASCII by way of a Unicode escape sequence. If you want to return a byte string containing the literal byte 0xA3, that's

return b'\xa3'

(where in Python 2 the b is implicit; but explicit is better than implicit).

The linked PEP in the error message instructs you exactly how to tell Python "this file is not pure ASCII; here's the encoding I'm using". If the encoding is UTF-8, that would be

# coding=utf-8

or the Emacs-compatible

# -*- encoding: utf-8 -*-

If you don't know which encoding your editor uses to save this file, examine it with something like a hex editor and some googling. The Stack Overflow character-encoding tag has a tag info page with more information and some troubleshooting tips.

In so many words, outside of the 7-bit ASCII range (0x00-0x7F), Python can't and mustn't guess what string a sequence of bytes represents. https://tripleee.github.io/8bit#a3 shows 21 possible interpretations for the byte 0xA3 and that's only from the legacy 8-bit encodings; but it could also very well be the first byte of a multi-byte encoding. But in fact, I would guess you are actually using Latin-1, so you should have

# coding: latin-1

as the first or second line of your source file. Anyway, without knowledge of which character the byte is supposed to represent, a human would not be able to guess this, either.

A caveat: coding: latin-1 will definitely remove the error message (because there are no byte sequences which are not technically permitted in this encoding), but might produce completely the wrong result when the code is interpreted if the actual encoding is something else. You really have to know the encoding of the file with complete certainty when you declare the encoding.

Query to get only numbers from a string

T-SQL function to read all the integers from text and return the one at the indicated index, starting from left or right, also using a starting search term (optional):

create or alter function dbo.udf_number_from_text(
    @text nvarchar(max),
    @search_term nvarchar(1000) = N'',
    @number_position tinyint = 1,
    @rtl bit = 0
) returns int
as
    begin
        declare @result int = 0;
        declare @search_term_index int = 0;

        if @text is null or len(@text) = 0 goto exit_label;
        set @text = trim(@text);
        if len(@text) = len(@search_term) goto exit_label;

        if len(@search_term) > 0
            begin
                set @search_term_index = charindex(@search_term, @text);
                if @search_term_index = 0 goto exit_label;
            end;

        if @search_term_index > 0
            if @rtl = 0
                set @text = trim(right(@text, len(@text) - @search_term_index - len(@search_term) + 1));
            else
                set @text = trim(left(@text, @search_term_index - 1));
        if len(@text) = 0 goto exit_label;

        declare @patt_number nvarchar(10) = '%[0-9]%';
        declare @patt_not_number nvarchar(10) = '%[^0-9]%';
        declare @number_start int = 1;
        declare @number_end int;
        declare @found_numbers table (id int identity(1,1), val int);

        while @number_start > 0
        begin
            set @number_start = patindex(@patt_number, @text);
            if @number_start > 0
                begin
                    if @number_start = len(@text)
                        begin
                            insert into @found_numbers(val)
                            select cast(substring(@text, @number_start, 1) as int);

                            break;
                        end;
                    else
                        begin
                            set @text = right(@text, len(@text) - @number_start + 1);
                            set @number_end = patindex(@patt_not_number, @text);

                            if @number_end = 0
                                begin
                                    insert into @found_numbers(val)
                                    select cast(@text as int);

                                    break;
                                end;
                            else
                                begin
                                    insert into @found_numbers(val)
                                    select cast(left(@text, @number_end - 1) as int);

                                    if @number_end = len(@text)
                                        break;
                                    else
                                        begin
                                            set @text = trim(right(@text, len(@text) - @number_end));
                                            if len(@text) = 0 break;
                                        end;
                                end;
                        end;
                end;
        end;

        if @rtl = 0
            select @result = coalesce(a.val, 0)
            from (select row_number() over (order by m.id asc) as c_row, m.val
                    from @found_numbers as m) as a
            where a.c_row = @number_position;
        else
            select @result = coalesce(a.val, 0)
            from (select row_number() over (order by m.id desc) as c_row, m.val
                    from @found_numbers as m) as a
            where a.c_row = @number_position;


        exit_label:
            return @result;
    end;

Example:

select dbo.udf_number_from text(N'Text text 10 text, 25 term', N'term',2,1);

returns 10;

How to get filename without extension from file path in Ruby

Note that double quotes strings escape \'s.

'C:\projects\blah.dll'.split('\\').last

How to Call a JS function using OnClick event

I removed your document.getElementById("Save").onclick = before your functions, because it's an event already being called on your button. I also had to call the two functions separately by the onclick event.

     <!DOCTYPE html>
      <html>
      <head>
      <script>
       function fun()
        {
         alert("hello");
         //validation code to see State field is mandatory.  
        }   
        function f1()
        {
          alert("f1 called");
           //form validation that recalls the page showing with supplied inputs.    
        }
      </script>
      </head>
      <body>
      <form name="form1" id="form1" method="post">
                State: 
                <select id="state ID">
                   <option></option>
                   <option value="ap">ap</option>
                   <option value="bp">bp</option>
                </select>
       </form>

       <table><tr><td id="Save" onclick="f1(); fun();">click</td></tr></table>

   </body>
   </html>

In Node.js, how do I turn a string to a json?

use the JSON function >

JSON.parse(theString)

How to search in a List of Java object

If you always search based on value3, you could store the objects in a Map:

Map<String, List<Sample>> map = new HashMap <>();

You can then populate the map with key = value3 and value = list of Sample objects with that same value3 property.

You can then query the map:

List<Sample> allSamplesWhereValue3IsDog = map.get("Dog");

Note: if no 2 Sample instances can have the same value3, you can simply use a Map<String, Sample>.

The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Project ? Properties ? Target Runtimes ? Apache Tomcat worked for me. There is no Target Runtimes under Facets (I'm on Eclipse v4.2 (Juno)).

Get multiple elements by Id

Here is a function I came up with

function getElementsById(elementID){
    var elementCollection = new Array();
    var allElements = document.getElementsByTagName("*");
    for(i = 0; i < allElements.length; i++){
        if(allElements[i].id == elementID)
            elementCollection.push(allElements[i]);

    }
    return elementCollection;
}

Apparently there is a convention supported by prototype, and probably other major JavaScript libraries.

However, I have come to discover that dollar sign function has become the more-or-less de facto shortcut to document.getElementById(). Let’s face it, we all use document.getElementById() a lot. Not only does it take time to type, but it adds bytes to your code as well.

here is the function from prototype:

function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (Object.isString(element))
    element = document.getElementById(element);
  return Element.extend(element);
}

[Source]

I forgot the password I entered during postgres installation

find the file pg_hba.conf - it may be located, for example in /etc/postgresql-9.1/pg_hba.conf.

cd /etc/postgresql-9.1/
Back it up

cp pg_hba.conf pg_hba.conf-backup
place the following line (as either the first uncommented line, or as the only one):

For all occurrence of below (local and host) , exepct replication section if you don't have any it has to be changed as follow ,no MD5 or Peer autehication should be present.

local  all   all   trust

restart your PostgreSQL server (e.g., on Linux:)

sudo /etc/init.d/postgresql restart

If the service (daemon) doesn't start reporting in log file:

local connections are not supported by this build

you should change

local all all trust

to

host all all 127.0.0.1/32 trust
you can now connect as any user. Connect as the superuser postgres (note, the superuser name may be different in your installation. In some systems it is called pgsql, for example.)

psql -U postgres

or

psql -h 127.0.0.1 -U postgres

(note that with the first command you will not always be connected with local host)
Reset password ('replace my_user_name with postgres since you are resetting postgres user)

ALTER USER my_user_name with password 'my_secure_password';
Restore the old pg_hba.conf as it is very dangerous to keep around

cp pg_hba.conf-backup pg_hba.conf
restart the server, in order to run with the safe pg_hba.conf

sudo /etc/init.d/postgresql restart

Further Reading about that pg_hba file: http://www.postgresql.org/docs/9.1/static/auth-pg-hba-conf.html

How can I compile LaTeX in UTF8?

\usepackage[utf8]{inputenc} will not work for a bibliographic entry such as this:

@ARTICLE{Hardy2007,
author = {Ibn Taymiyyah, A?mad ibn ?Abd al{-}Halim},
title = {Naq? al{-}man?iq},
shorttitle = {Naq? al-man?iq},
editor = {?amzah, A?mad},
publisher = {Maktabat a{l-}Sunnah},
address = {Cairo},
year = {1970},
sortname = {IbnTaymiyyaNaqdalmantiq},
keywords = { Logic, Medieval}}

For this entry use \usepackage[utf8x]{inputenc}

iOS 7 - Status bar overlaps the view

If you want "Use Autolayout" to be enabled at any cost place the following code in viewdidload.

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) 
{
        self.edgesForExtendedLayout = UIRectEdgeNone;
        self.extendedLayoutIncludesOpaqueBars = NO;
        self.automaticallyAdjustsScrollViewInsets = NO;
}

ImportError: No module named sklearn.cross_validation

sklearn.cross_validation is now changed to sklearn.model_selection

Just use

from sklearn.model_selection import train_test_split

I think that will work.

Is it a good practice to use an empty URL for a HTML form's action attribute? (action="")

I normally use action="", which is XHTML valid and retains the GET data in the URL.

How to fill Matrix with zeros in OpenCV?

Mat img;

img=Mat::zeros(size of image,CV_8UC3);

if you want it to be of an image img1

img=Mat::zeros(img1.size,CV_8UC3);

How do I parse a URL into hostname and path in javascript?

var loc = window.location;  // => "http://example.com:3000/pathname/?search=test#hash"

returns the currentUrl.

If you want to pass your own string as a url (doesn't work in IE11):

var loc = new URL("http://example.com:3000/pathname/?search=test#hash")

Then you can parse it like:

loc.protocol; // => "http:"
loc.host;     // => "example.com:3000"
loc.hostname; // => "example.com"
loc.port;     // => "3000"
loc.pathname; // => "/pathname/"
loc.hash;     // => "#hash"
loc.search;   // => "?search=test"

How to create a list of objects?

The Python Tutorial discusses how to use lists.

Storing a list of classes is no different than storing any other objects.

def MyClass(object):
    pass

my_types = [str, int, float, MyClass]

cast class into another class or convert class to another

You could change your class structure to:

public class maincs : sub1
{
   public int d; 
}

public class sub1
{
   public int a;
   public int b;
   public int c;
}

Then you could keep a list of sub1 and cast some of them to mainc.

How to open Form in Add record

JavaScript + Unicode regexes

Situation for ES 6

The upcoming ECMAScript language specification, edition 6, includes Unicode-aware regular expressions. Support must be enabled with the u modifier on the regex. See Unicode-aware regular expressions in ES6.

Until ES 6 is finished and widely adopted among browser vendors you're still on your own, though. Update: There is now a transpiler named regexpu that translates ES6 Unicode regular expressions into equivalent ES5. It can be used as part of your build process. Try it out online.

Situation for ES 5 and below

Even though JavaScript operates on Unicode strings, it does not implement Unicode-aware character classes and has no concept of POSIX character classes or Unicode blocks/sub-ranges.

Issues with Unicode in JavaScript regular expressions
Check your expectations here: Javascript RegExp Unicode Character Class tester (Edit: the original page is down, the Internet Archive still has a copy.)
Flagrant Badassery has an article on JavaScript, Regex, and Unicode that sheds some light on the matter.
Also read Regex and Unicode here on SO. Probably you have to build your own "punctuation character class".
Check out the Regular Expression: Match Unicode Block Range builder, which lets you build a JavaScript regular expression that matches characters that fall in any number of specified Unicode blocks.

I just did it for the "General Punctuation" and "Supplemental Punctuation" sub-ranges, and the result is as simple and straight-forward as I would have expected it:
```
 [\u2000-\u206F\u2E00-\u2E7F]
```
There also is XRegExp, a project that brings Unicode support to JavaScript by offering an alternative regex engine with extended capabilities.
And of course, required reading: mathiasbynens.be - JavaScript has a Unicode problem:

Python slice first and last element in list

Utilize the packing/unpacking operator to pack the middle of the list into a single variable:

>>> l = ['1', 'B', '3', 'D', '5', 'F']
>>> first, *middle, last = l
>>> first
'1'
>>> middle
['B', '3', 'D', '5']
>>> last
'F'
>>>

Or, if you want to discard the middle:

>>> l = ['1', 'B', '3', 'D', '5', 'F']
>>> first, *_, last = l
>>> first
'1'
>>> last
'F'
>>>

How to launch another aspx web page upon button click?

You should use:

protected void btn1_Click(object sender, EventArgs e)
{
    Response.Redirect("otherpage.aspx");
}

NSURLConnection Using iOS Swift

An abbreviated version of your code worked for me,

class Remote: NSObject {

    var data = NSMutableData()

    func connect(query:NSString) {
        var url =  NSURL.URLWithString("http://www.google.com")
        var request = NSURLRequest(URL: url)
        var conn = NSURLConnection(request: request, delegate: self, startImmediately: true)
    }


     func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
        println("didReceiveResponse")
    }

    func connection(connection: NSURLConnection!, didReceiveData conData: NSData!) {
        self.data.appendData(conData)
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
        println(self.data)
    }


    deinit {
        println("deiniting")
    }
}

This is the code I used in the calling class,

class ViewController: UIViewController {

    var remote = Remote()


    @IBAction func downloadTest(sender : UIButton) {
        remote.connect("/apis")
    }

}

You didn't specify in your question where you had this code,

var remote = Remote()
remote.connect("/apis")

If var is a local variable, then the Remote class will be deallocated right after the connect(query:NSString) method finishes, but before the data returns. As you can see by my code, I usually implement reinit (or dealloc up to now) just to make sure when my instances go away. You should add that to your Remote class to see if that's your problem.

How to generate random colors in matplotlib?

If you want to ensure the colours are distinct - but don't know how many colours are needed. Try something like this. It selects colours from opposite sides of the spectrum and systematically increases granularity.

import math

def calc(val, max = 16):
    if val < 1:
        return 0
    if val == 1:
        return max

    l = math.floor(math.log2(val-1))    #level 
    d = max/2**(l+1)                    #devision
    n = val-2**l                        #node
    return d*(2*n-1)

import matplotlib.pyplot as plt

N = 16
cmap = cmap = plt.cm.get_cmap('gist_rainbow', N)

fig, axs = plt.subplots(2)
for ax in axs:
    ax.set_xlim([ 0, N])
    ax.set_ylim([-0.5, 0.5])
    ax.set_yticks([])

for i in range(0,N+1):
    v = int(calc(i, max = N))
    rect0 = plt.Rectangle((i, -0.5), 1, 1, facecolor=cmap(i))
    rect1 = plt.Rectangle((i, -0.5), 1, 1, facecolor=cmap(v))
    axs[0].add_artist(rect0)
    axs[1].add_artist(rect1)

plt.xticks(range(0, N), [int(calc(i, N)) for i in range(0, N)])
plt.show()

output

Thanks to @Ali for providing the base implementation.

Eclipse says: “Workspace in use or cannot be created, chose a different one.” How do I unlock a workspace?

I had this error after I restarted the system (after a long time. Normally I just make it sleep). Found out that once I mounted the drives (by clicking and opening it) where project folder is located, and relaunching eclipse, solved the issue for me.

PS: I'm an ubuntu user.

If WorkSheet("wsName") Exists

There's no built-in function for this.

Function SheetExists(SheetName As String, Optional wb As Excel.Workbook)
   Dim s As Excel.Worksheet
   If wb Is Nothing Then Set wb = ThisWorkbook
   On Error Resume Next
   Set s = wb.Sheets(SheetName)
   On Error GoTo 0
   SheetExists = Not s Is Nothing
End Function

Select 2 columns in one and combine them

Yes, you can combine columns easily enough such as concatenating character data:

select col1 | col 2 as bothcols from tbl ...

or adding (for example) numeric data:

select col1 + col2 as bothcols from tbl ...

In both those cases, you end up with a single column bothcols, which contains the combined data. You may have to coerce the data type if the columns are not compatible.

iPad Safari scrolling causes HTML elements to disappear and reappear with a delay

When the translate3d doesn't work, try to add perspective. It always works for me

transform: translate3d(0, 0, 0);
-webkit-transform: translate3d(0, 0, 0);
perspective: 1000;
-webkit-perspective: 1000;

http://blog.teamtreehouse.com/increase-your-sites-performance-with-hardware-accelerated-css

jQuery object equality

Use Underscore.js isEqual method http://underscorejs.org/#isEqual

‘ld: warning: directory not found for option’

PHP to search within txt file and echo the whole line

looks like you're better off systeming out to system("grep \"$QUERY\"") since that script won't be particularly high performance either way. Otherwise http://php.net/manual/en/function.file.php shows you how to loop over lines and you can use http://php.net/manual/en/function.strstr.php for finding matches.

Issue when importing dataset: `Error in scan(...): line 1 did not have 145 elements`

Beside all the guidance mentioned above,you can also check all the data.

If there are blanks between words, you must replace them with "_".

However that how I solve my own problem.

Write in body request with HttpClient

If your xml is written by java.lang.String you can just using HttpClient in this way

    public void post() throws Exception{
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost("http://www.baidu.com");
        String xml = "<xml>xxxx</xml>";
        HttpEntity entity = new ByteArrayEntity(xml.getBytes("UTF-8"));
        post.setEntity(entity);
        HttpResponse response = client.execute(post);
        String result = EntityUtils.toString(response.getEntity());
    }

pay attention to the Exceptions.

BTW, the example is written by the httpclient version 4.x

cannot make a static reference to the non-static field

The static calls to withdraw and deposit are your problem. account.withdraw(balance, 2500); This line can't work , since "balance" is an instance variable of Account. The code doesn't make much sense anyway, wouldn't withdraw/deposit be encapsulated inside the Account object itself? so the withdraw should be more like

public void withdraw(double withdrawAmount)
{
    balance -= withdrawAmount;
}

Of course depending on your problem you could do additional validation here to prevent negative balance etc.

Ubuntu says "bash: ./program Permission denied"

Try this:

sudo chmod +x program_name
./program_name

Calling a particular PHP function on form submit

Assuming that your script is named x.php, try this

<?php 
   function display($s) {
      echo $s;
   }
?>
<html>
    <body>
        <form method="post" action="x.php">
            <input type="text" name="studentname">
            <input type="submit" value="click">
        </form>
        <?php
           if($_SERVER['REQUEST_METHOD']=='POST')
           {
               display();
           } 
        ?>
    </body>
</html>

HashMaps and Null values?

you can probably do it like this:

String k = null;
String v = null;
options.put(k,v);

When should I use Lazy<T>?

Just to point onto the example posted by Mathew

public sealed class Singleton
{
    // Because Singleton's constructor is private, we must explicitly
    // give the Lazy<Singleton> a delegate for creating the Singleton.
    private static readonly Lazy<Singleton> instanceHolder =
        new Lazy<Singleton>(() => new Singleton());

    private Singleton()
    {
        ...
    }

    public static Singleton Instance
    {
        get { return instanceHolder.Value; }
    }
}

before the Lazy was born we would have done it this way:

private static object lockingObject = new object();
public static LazySample InstanceCreation()
{
    if(lazilyInitObject == null)
    {
         lock (lockingObject)
         {
              if(lazilyInitObject == null)
              {
                   lazilyInitObject = new LazySample ();
              }
         }
    }
    return lazilyInitObject ;
}

How do I concatenate const/literal strings in C?

Avoid using strcat in C code. The cleanest and, most importantly, the safest way is to use snprintf:

char buf[256];
snprintf(buf, sizeof buf, "%s%s%s%s", str1, str2, str3, str4);

Some commenters raised an issue that the number of arguments may not match the format string and the code will still compile, but most compilers already issue a warning if this is the case.

Prevent Default on Form Submit jQuery

Your Code is Fine just you need to place it inside the ready function.

$(document).ready( function() {
  $("#cpa-form").submit(function(e){
     e.preventDefault();
  });
}

How come I can't remove the blue textarea border in Twitter Bootstrap?

This worked for me

.form-control {
box-shadow: none!important;}

Connect Bluestacks to Android Studio

In my case I didn't needed start adb.exe. I only started the BlueStacks before android studio.

After that when I press "Run" in android studio, bluestacks is detected as a new emulator.

enter image description here

Regards.

Notification bar icon turns white in Android 5 Lollipop

You Need to import the single color transparent PNG image. So You can set the Icon color of the small icon. Otherwise it will be shown white in some devices like MOTO

How do I compare two Integers?

Compare integer and print its value in value ascending or descending order. All you have to do is implements Comparator interface and override its compare method and compare its value as below:

@Override
public int compare(Integer o1, Integer o2) {
    if (ascending) {
        return o1.intValue() - o2.intValue();
    } else {
        return o2.intValue() - o1.intValue();
    }

}

Rename a table in MySQL

According to mysql docs: "to rename TEMPORARY tables, RENAME TABLE does not work. Use ALTER TABLE instead."

So this is the most portable method:

ALTER TABLE `old_name` RENAME `new_name`;

How to set and reference a variable in a Jenkinsfile

I can' t comment yet but, just a hint: use try/catch clauses to avoid breaking the pipeline (if you are sure the file exists, disregard)

    pipeline {
        agent any
            stages {
                stage("foo") {
                    steps {
                        script {
                            try {                    
                                env.FILENAME = readFile 'output.txt'
                                echo "${env.FILENAME}"
                            }
                            catch(Exception e) {
                                //do something, e.g. echo 'File not found'
                            }
                        }
                   }
    }

Another hint (this was commented by @hao, and think is worth to share): you may want to trim like this readFile('output.txt').trim()

How can I add new array elements at the beginning of an array in Javascript?

Quick Cheatsheet:

The terms shift/unshift and push/pop can be a bit confusing, at least to folks who may not be familiar with programming in C.

If you are not familiar with the lingo, here is a quick translation of alternate terms, which may be easier to remember:

* array_unshift()  -  (aka Prepend ;; InsertBefore ;; InsertAtBegin )     
* array_shift()    -  (aka UnPrepend ;; RemoveBefore  ;; RemoveFromBegin )

* array_push()     -  (aka Append ;; InsertAfter   ;; InsertAtEnd )     
* array_pop()      -  (aka UnAppend ;; RemoveAfter   ;; RemoveFromEnd )

Converting file size in bytes to human-readable string

I found @cocco's answer interesting, but had the following issues with it:

Don't modify native types or types you don't own
Write clean, readable code for humans, let minifiers optimize code for machines
(Bonus for TypeScript users) Doesn't play well with TypeScript

TypeScript:

 /**
 * Describes manner by which a quantity of bytes will be formatted.
 */
enum ByteFormat {
  /**
   * Use Base 10 (1 kB = 1000 bytes). Recommended for sizes of files on disk, disk sizes, bandwidth.
   */
  SI = 0,
  /**
   * Use Base 2 (1 KiB = 1024 bytes). Recommended for RAM size, size of files on disk.
   */
  IEC = 1
}

/**
 * Returns a human-readable representation of a quantity of bytes in the most reasonable unit of magnitude.
 * @example
 * formatBytes(0) // returns "0 bytes"
 * formatBytes(1) // returns "1 byte"
 * formatBytes(1024, ByteFormat.IEC) // returns "1 KiB"
 * formatBytes(1024, ByteFormat.SI) // returns "1.02 kB"
 * @param size The size in bytes.
 * @param format Format using SI (Base 10) or IEC (Base 2). Defaults to SI.
 * @returns A string describing the bytes in the most reasonable unit of magnitude.
 */
function formatBytes(
  value: number,
  format: ByteFormat = ByteFormat.SI
) {
  const [multiple, k, suffix] = (format === ByteFormat.SI
    ? [1000, 'k', 'B']
    : [1024, 'K', 'iB']) as [number, string, string]
  // tslint:disable-next-line: no-bitwise
  const exp = (Math.log(value) / Math.log(multiple)) | 0
  // or, if you'd prefer not to use bitwise expressions or disabling tslint rules, remove the line above and use the following:
  // const exp = value === 0 ? 0 : Math.floor(Math.log(value) / Math.log(multiple)) 
  const size = Number((value / Math.pow(multiple, exp)).toFixed(2))
  return (
    size +
    ' ' +
    (exp 
       ? (k + 'MGTPEZY')[exp - 1] + suffix 
       : 'byte' + (size !== 1 ? 's' : ''))
  )
}

// example
[0, 1, 1024, Math.pow(1024, 2), Math.floor(Math.pow(1024, 2) * 2.34), Math.pow(1024, 3), Math.floor(Math.pow(1024, 3) * 892.2)].forEach(size => {
  console.log('Bytes: ' + size)
  console.log('SI size: ' + formatBytes(size))
  console.log('IEC size: ' + formatBytes(size, 1) + '\n')
});

Allowing Java to use an untrusted certificate for SSL/HTTPS connection

Another option is to get a ".pem" (public key) file for that particular server, and install it locally into the heart of your JRE's "cacerts" file (use the keytool helper application), then it will be able to download from that server without complaint, without compromising the entire SSL structure of your running JVM and enabling download from other unknown cert servers...

How to convert a byte array to Stream

I am using as what John Rasch said:

Stream streamContent = taxformUpload.FileContent;

No WebApplicationContext found: no ContextLoaderListener registered?

You'll have to have a ContextLoaderListener in your web.xml - It loads your configuration files.

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

You need to understand the difference between Web application context and root application context .

In the web MVC framework, each DispatcherServlet has its own WebApplicationContext, which inherits all the beans already defined in the root WebApplicationContext. These inherited beans defined can be overridden in the servlet-specific scope, and new scope-specific beans can be defined local to a given servlet instance.

The dispatcher servlet's application context is a web application context which is only applicable for the Web classes . You cannot use these for your middle tier layers . These need a global app context using ContextLoaderListener .

Read the spring reference here for spring mvc .

An unhandled exception of type 'System.TypeInitializationException' occurred in EntityFramework.dll

Check that right version is referenced in your project. E.g. the dll it is complaining about, could be from an older version and that's why there could be a version mismatch.

Installing MySQL in Docker fails with error message "Can't connect to local MySQL server through socket"

In my case I tried to connect to DB (which was inside docker) like this:

mysql -ppass -u root

but got same error as OP.

Specifying host and port helped:

mysql --host 0.0.0.0 --port 3306 -ppass -u root

Trim to remove white space

jQuery.trim() capital Q?

or $.trim()

Visual Studio 6 Windows Common Controls 6.0 (sp6) Windows 7, 64 bit

Open Registry Editor using run command regedit.

Locate HKEY_CLASSES_ROOT\TypeLib Key and then did a search for "MSCOMCTL.OCX" and deleted EVERY key that referenced this .ocx file.

Open command prompt (cmd) in Administrator mode. The type the following code,

In 32 bit machine,

cd c:\Windows\System32
regsvr32 MSCOMCTL.OCX
regtlib msdatsrc.tlb
regsvr32 MSCOMCT2.OCX

In 64 bit machine,

cd c:\Windows\SysWOW64
regsvr32 MSCOMCTL.OCX
regtlib msdatsrc.tlb
regsvr32 MSCOMCT2.OCX

IIS Config Error - This configuration section cannot be used at this path

I think the better way is that you must remove you configuration from your web.config. Publish your code on the server and do what you want to remove directly from the IIS server interface.

Thanks to this method if you sucessfully do what you want, you just have to get the web.config and compare the differences. After that you just have to post the solution in this post :-P.

Maven - Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean

In my case I changed the owner of all the files and it worked.

sudo chown -R anuruddha *

How do I get a reference to the app delegate in Swift?

The other solution is correct in that it will get you a reference to the application's delegate, but this will not allow you to access any methods or variables added by your subclass of UIApplication, like your managed object context. To resolve this, simply downcast to "AppDelegate" or what ever your UIApplication subclass happens to be called. In Swift 3, 4 & 5, this is done as follows:

let appDelegate = UIApplication.shared.delegate as! AppDelegate
let aVariable = appDelegate.someVariable

putting a php variable in a HTML form value

value="<?php echo htmlspecialchars($name); ?>"

How to convert LINQ query result to List?

You need to use the select new LINQ keyword to explicitly convert your tbcourseentity into the custom type course. Example of select new:

var q = from o in db.Orders
        where o.Products.ProductName.StartsWith("Asset") && 
              o.PaymentApproved == true
        select new { name   = o.Contacts.FirstName + " " +
                              o.Contacts.LastName, 
                     product = o.Products.ProductName, 
                     version = o.Products.Version + 
                              (o.Products.SubVersion * 0.1)
                   };

http://www.hookedonlinq.com/LINQtoSQL5MinuteOverview.ashx

Where is Android Studio layout preview?

If you see a message at the bottom saying something like, "Android Framework detected. Click to configure", DO IT.

After doing this, my Text and Design bottom-tabs appeared.

How do I find where JDK is installed on my windows machine?

In a Windows command prompt, just type:

set java_home

Or, if you don't like the command environment, you can check it from:

Start menu > Computer > System Properties > Advanced System Properties. Then open Advanced tab > Environment Variables and in system variable try to find JAVA_HOME.

enter image description here

how to convert Lower case letters to upper case letters & and upper case letters to lower case letters

You don't have to track whether you've already changed the character from upper to lower. Your code is already doing that since it's basically:

1   for each character x:
2       if x is uppercase:
3           convert x to lowercase
4       else:
5           if x is lowercase:
6                convert x to uppercase.

The fact that you have that else in there (on line 4) means that a character that was initially uppercase will never be checked in the second if statement (on line 5).

Example, start with A. Because that's uppercase, it will be converted to lowercase on line 3 and then you'll go back up to line 1 for the next character.

If you start with z, the if on line 2 will send you directly to line 5 where it will be converted to uppercase. Anything that's neither upper nor lowercase will fail both if statements and therefore remain untouched.

GIT commit as different user without email / or only email

Format

A U Thor <[email protected]>

simply mean that you should specify

FirstName MiddleName LastName <[email protected]>

Looks like middle and last names are optional (maybe the part before email doesn't have a strict format at all). Try, for example, this:

git commit --author="John <[email protected]>" -m "some fix"

As the docs say:

  --author=<author>
       Override the commit author. Specify an explicit author using the standard 
       A U Thor <[email protected]> format. Otherwise <author> is assumed to 
       be a pattern and is used to search for an existing commit by that author 
       (i.e. rev-list --all -i --author=<author>); the commit author is then copied 
       from the first such commit found.

if you don't use this format, git treats provided string as a pattern and tries to find matching name among the authors of other commits.

How to work offline with TFS

If the code has already been checked out by the user that if offline and they have the latest version on their local hd, then they just need to browse to the solution location and open the solution by double clicking sln file. The solution will open in disconnected mode.

Checking for directory and file write permissions in .NET

Try working with this C# snippet I just crafted:

using System;
using System.IO;
using System.Security.AccessControl;
using System.Security.Principal;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string directory = @"C:\downloads";

            DirectoryInfo di = new DirectoryInfo(directory);

            DirectorySecurity ds = di.GetAccessControl();

            foreach (AccessRule rule in ds.GetAccessRules(true, true, typeof(NTAccount)))
            {
                Console.WriteLine("Identity = {0}; Access = {1}", 
                              rule.IdentityReference.Value, rule.AccessControlType);
            }
        }
    }
}

And here's a reference you could also look at. My code might give you an idea as to how you could check for permissions before attempting to write to a directory.

How to wrap text around an image using HTML/CSS

If the image size is variable or the design is responsive, in addition to wrapping the text, you can set a min width for the paragraph to avoid it to become too narrow.
Give an invisible CSS pseudo-element with the desired minimum paragraph width. If there isn't enough space to fit this pseudo-element, then it will be pushed down underneath the image, taking the paragraph with it.

#container:before {
  content: ' ';
  display: table;
  width: 10em;    /* Min width required */
}
#floated{
    float: left;
    width: 150px;
    background: red;
}

Disable Pinch Zoom on Mobile Web

Try with min-width property. Let me explain you. Assume a device with screen width of 400px (for an instance). When you zoom in, the fonts gets larger and larger. But boxes and divs remains with same width. If you use min-width, you can avoid decreasing your div and box.

How to upload, display and save images using node.js and express

First of all, you should make an HTML form containing a file input element. You also need to set the form's enctype attribute to multipart/form-data:

<form method="post" enctype="multipart/form-data" action="/upload">
    <input type="file" name="file">
    <input type="submit" value="Submit">
</form>

Assuming the form is defined in index.html stored in a directory named public relative to where your script is located, you can serve it this way:

const http = require("http");
const path = require("path");
const fs = require("fs");

const express = require("express");

const app = express();
const httpServer = http.createServer(app);

const PORT = process.env.PORT || 3000;

httpServer.listen(PORT, () => {
  console.log(`Server is listening on port ${PORT}`);
});

// put the HTML file containing your form in a directory named "public" (relative to where this script is located)
app.get("/", express.static(path.join(__dirname, "./public")));

Once that's done, users will be able to upload files to your server via that form. But to reassemble the uploaded file in your application, you'll need to parse the request body (as multipart form data).

In Express 3.x you could use express.bodyParser middleware to handle multipart forms but as of Express 4.x, there's no body parser bundled with the framework. Luckily, you can choose from one of the many available multipart/form-data parsers out there. Here, I'll be using multer:

You need to define a route to handle form posts:

const multer = require("multer");

const handleError = (err, res) => {
  res
    .status(500)
    .contentType("text/plain")
    .end("Oops! Something went wrong!");
};

const upload = multer({
  dest: "/path/to/temporary/directory/to/store/uploaded/files"
  // you might also want to set some limits: https://github.com/expressjs/multer#limits
});


app.post(
  "/upload",
  upload.single("file" /* name attribute of <file> element in your form */),
  (req, res) => {
    const tempPath = req.file.path;
    const targetPath = path.join(__dirname, "./uploads/image.png");

    if (path.extname(req.file.originalname).toLowerCase() === ".png") {
      fs.rename(tempPath, targetPath, err => {
        if (err) return handleError(err, res);

        res
          .status(200)
          .contentType("text/plain")
          .end("File uploaded!");
      });
    } else {
      fs.unlink(tempPath, err => {
        if (err) return handleError(err, res);

        res
          .status(403)
          .contentType("text/plain")
          .end("Only .png files are allowed!");
      });
    }
  }
);

In the example above, .png files posted to /upload will be saved to uploaded directory relative to where the script is located.

In order to show the uploaded image, assuming you already have an HTML page containing an img element:

<img src="/image.png" />

you can define another route in your express app and use res.sendFile to serve the stored image:

app.get("/image.png", (req, res) => {
  res.sendFile(path.join(__dirname, "./uploads/image.png"));
});

SQL - using alias in Group By

SQL Server doesn't allow you to reference the alias in the GROUP BY clause because of the logical order of processing. The GROUP BY clause is processed before the SELECT clause, so the alias is not known when the GROUP BY clause is evaluated. This also explains why you can use the alias in the ORDER BY clause.

Here is one source for information on the SQL Server logical processing phases.

How to save the contents of a div as a image?

There are several of this same question (1, 2). One way of doing it is using canvas. Here's a working solution. Here you can see some working examples of using this library.

Removing Spaces from a String in C?

The easiest and most efficient way to remove spaces from a string is to simply remove the spaces from the string literal. For example, use your editor to 'find and replace' "hello world" with "helloworld", and presto!

Okay, I know that's not what you meant. Not all strings come from string literals, right? Supposing this string you want spaces removed from doesn't come from a string literal, we need to consider the source and destination of your string... We need to consider your entire algorithm, what actual problem you're trying to solve, in order to suggest the simplest and most optimal methods.

Perhaps your string comes from a file (e.g. stdin) and is bound to be written to another file (e.g. stdout). If that's the case, I would question why it ever needs to become a string in the first place. Just treat it as though it's a stream of characters, discarding the spaces as you come across them...

#include <stdio.h>

int main(void) {
    for (;;) {
        int c = getchar();
        if (c == EOF) { break;    }
        if (c == ' ') { continue; }
        putchar(c);
    }
}

By eliminating the need for storage of a string, not only does the entire program become much, much shorter, but theoretically also much more efficient.

How to get an Instagram Access Token

go to manage clinet page in :

http://www.instagram.com/developer/

set a redirect url

then :

use this code to get access token :

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>tst</title>
<script src="../jq.js"></script>
<script type="text/javascript">
       $.ajax({
            type: 'GET',
            url: 'https://api.instagram.com/oauth/authorize/?client_id=CLIENT-??ID&redirect_uri=REDI?RECT-URI&response_ty?pe=code'
            dataType: 'jsonp'}).done(function(response){
                var access = window.location.hash.substring(14);
                //you have access token in access var   
            });
</script>
</head>
<body>  
</body>
</html>

How to validate a url in Python? (Malformed or not)

Nowadays, I use the following, based on the Padam's answer:

$ python --version
Python 3.6.5

And this is how it looks:

from urllib.parse import urlparse

def is_url(url):
  try:
    result = urlparse(url)
    return all([result.scheme, result.netloc])
  except ValueError:
    return False

Just use is_url("http://www.asdf.com").

Hope it helps!

Use curly braces to initialize a Set in Python

From Python 3 documentation (the same holds for python 2.7):

Curly braces or the set() function can be used to create sets. Note: to create an empty set you have to use set(), not {}; the latter creates an empty dictionary, a data structure that we discuss in the next section.

in python 2.7:

>>> my_set = {'foo', 'bar', 'baz', 'baz', 'foo'}
>>> my_set
set(['bar', 'foo', 'baz'])

Be aware that {} is also used for map/dict:

>>> m = {'a':2,3:'d'}
>>> m[3]
'd'
>>> m={}
>>> type(m)
<type 'dict'>

One can also use comprehensive syntax to initialize sets:

>>> a = {x for x in """didn't know about {} and sets """ if x not in 'set' }
>>> a
set(['a', ' ', 'b', 'd', "'", 'i', 'k', 'o', 'n', 'u', 'w', '{', '}'])

IsNullOrEmpty with Object

obj1 != null

is the right way.

String defines IsNullOrEmpty as a nicer way to say

obj1 == null || obj == String.Empty

so it does more than just check for nullity.

There may be other classes that define a method to check for a sematically "blank or null" object, but that would depend on the semantics of the class, and is by no means universal.

It's also possible to create extension method to do this kind of thing if it helps the readability of your code. For example, a similar approach to collections:

public static bool IsNullOrEmpty (this ICollection collection)
{
    return collection == null || collection.Count == 0;
}

Format cell if cell contains date less than today

Your first problem was you weren't using your compare symbols correctly.

< less than
> greater than
<= less than or equal to
>= greater than or equal to

To answer your other questions; get the condition to work on every cell in the column and what about blanks?

What about blanks?

Add an extra IF condition to check if the cell is blank or not, if it isn't blank perform the check. =IF(B2="","",B2<=TODAY())

Condition on every cell in column

enter image description here

How to redirect all HTTP requests to HTTPS

Unless you need mod_rewrite for other things, using Apache core IF directive is cleaner & faster:

<If "%{HTTPS} == 'off'">
Redirect permanent / https://yoursite.com/
</If>

You can add more conditions to the IF directive, such as ensure a single canonical domain without the www prefix:

<If "req('Host') != 'myonetruesite.com' || %{HTTPS} == 'off'">
Redirect permanent / https://myonetruesite.com/
</If>

There's a lot of familiarity inertia in using mod_rewrite for everything, but see if this works for you.

More info: https://httpd.apache.org/docs/2.4/mod/core.html#if

To see it in action (try without www. or https://, or with .net instead of .com): https://nohodental.com/ (a site I'm working on).

Add empty columns to a dataframe with specified names from a vector

The below works for me

dataframe[,"newName"] <- NA

Make sure to add "" for new name string.

How to get arguments with flags in Bash

Another alternative would be to use something like the below example which would allow you to use long --image or short -i tags and also allow compiled -i="example.jpg" or separate -i example.jpg methods of passing in arguments.

# declaring a couple of associative arrays
declare -A arguments=();  
declare -A variables=();

# declaring an index integer
declare -i index=1;

# any variables you want to use here
# on the left left side is argument label or key (entered at the command line along with it's value) 
# on the right side is the variable name the value of these arguments should be mapped to.
# (the examples above show how these are being passed into this script)
variables["-gu"]="git_user";  
variables["--git-user"]="git_user";  
variables["-gb"]="git_branch";  
variables["--git-branch"]="git_branch";  
variables["-dbr"]="db_fqdn";  
variables["--db-redirect"]="db_fqdn";  
variables["-e"]="environment";  
variables["--environment"]="environment";

# $@ here represents all arguments passed in
for i in "$@"  
do  
  arguments[$index]=$i;
  prev_index="$(expr $index - 1)";

  # this if block does something akin to "where $i contains ="
  # "%=*" here strips out everything from the = to the end of the argument leaving only the label
  if [[ $i == *"="* ]]
    then argument_label=${i%=*} 
    else argument_label=${arguments[$prev_index]}
  fi

  # this if block only evaluates to true if the argument label exists in the variables array
  if [[ -n ${variables[$argument_label]} ]]
    then
        # dynamically creating variables names using declare
        # "#$argument_label=" here strips out the label leaving only the value
        if [[ $i == *"="* ]]
            then declare ${variables[$argument_label]}=${i#$argument_label=} 
            else declare ${variables[$argument_label]}=${arguments[$index]}
        fi
  fi

  index=index+1;
done;

# then you could simply use the variables like so:
echo "$git_user";

Why is using the JavaScript eval function a bad idea?

eval() is very powerful and can be used to execute a JS statement or evaluate an expression. But the question isn't about the uses of eval() but lets just say some how the string you running with eval() is affected by a malicious party. At the end you will be running malicious code. With power comes great responsibility. So use it wisely is you are using it. This isn't related much to eval() function but this article has pretty good information: http://blogs.popart.com/2009/07/javascript-injection-attacks/ If you are looking for the basics of eval() look here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval

Is it possible to sort a ES6 map object?

Slight variation - I didn't have spread syntax and I wanted to work on an object instead of a Map.

Object.fromEntries(Object.entries(apis).sort())

How to go to a URL using jQuery?

//As an HTTP redirect (back button will not work )
window.location.replace("http://www.google.com");

//like if you click on a link (it will be saved in the session history, 
//so the back button will work as expected)
window.location.href = "http://www.google.com";

How Do I Insert a Byte[] Into an SQL Server VARBINARY Column

You can do something like this, very simple and efficient solution: What i did was actually use a parameter instead of basic placeholder, created a SqlParameter object and used another existing execution method. For e.g in your scenario:

string sql = "INSERT INTO mssqltable (varbinarycolumn) VALUES (@img)";
SqlParameter param = new SqlParameter("img", arraytoinsert); //where img is your parameter name in the query
ExecuteStoreCommand(sql, param);

This should work like a charm, provided you have an open sql connection established.

How to mock void methods with Mockito

I think your problems are due to your test structure. I've found it difficult to mix mocking with the traditional method of implementing interfaces in the test class (as you've done here).

If you implement the listener as a Mock you can then verify the interaction.

Listener listener = mock(Listener.class);
w.addListener(listener);
world.doAction(..);
verify(listener).doAction();

This should satisfy you that the 'World' is doing the right thing.

how to create 100% vertical line in css

Use an absolutely positioned pseudo element:

ul:after {
  content: '';
  width: 0;
  height: 100%;
  position: absolute;
  border: 1px solid black;
  top: 0;
  left: 100px;
}

Demo

How do I loop through children objects in javascript?

In ECS6, one may use Array.from():

const listItems = document.querySelector('ul').children;
const listArray = Array.from(listItems);
listArray.forEach((item) => {console.log(item)});

jQuery UI " $("#datepicker").datepicker is not a function"

I could fix this problem removing the jquery bundle on the _Layout.cshtml

Header

    <script src="~/Scripts/jquery-1.10.2.js"></script>
    <script src="~/Scripts/kendo/2015.2.902/kendo.all.min.js"></script>
    ...

Footer

    @Scripts.Render("~/bundles/jquery")
    @Scripts.Render("~/bundles/bootstrap")
    @RenderSection("scripts", required: false)

Change footer to

    @Scripts.Render("~/bundles/bootstrap")
    @RenderSection("scripts", required: false)

Proper use of const for defining functions in JavaScript

Although using const to define functions seems like a hack, but it comes with some great advantages that make it superior (in my opinion)

It makes the function immutable, so you don't have to worry about that function being changed by some other piece of code.
You can use fat arrow syntax, which is shorter & cleaner.
Using arrow functions takes care of this binding for you.

example with function

_x000D_

// define a function_x000D_
function add(x, y) { return x + y; }_x000D_
_x000D_
// use it_x000D_
console.log(add(1, 2)); // 3_x000D_
_x000D_
// oops, someone mutated your function_x000D_
add = function (x, y) { return x - y; };_x000D_
_x000D_
// now this is not what you expected_x000D_
console.log(add(1, 2)); // -1

_x000D_

same example with const

_x000D_

// define a function (wow! that is 8 chars shorter)_x000D_
const add = (x, y) => x + y;_x000D_
_x000D_
// use it_x000D_
console.log(add(1, 2)); // 3_x000D_
_x000D_
// someone tries to mutate the function_x000D_
add = (x, y) => x - y; // Uncaught TypeError: Assignment to constant variable._x000D_
// the intruder fails and your function remains unchanged

_x000D_

Unable to Connect to GitHub.com For Cloning

Open port 9418 on your firewall - it's a custom port that Git uses to communicate on and it's often not open on a corporate or private firewall.

phpMyAdmin on MySQL 8.0

I solved this issue by doing following:

Enter to system preferences -> mysql
Select "Initialize database" and enter a new root password selecting "Use Legacy Password Encryption".
Login into phpmyadmin with the new password.

How to document a method with parameter(s)?

Conventions:

Tools:

Update: Since Python 3.5 you can use type hints which is a compact, machine-readable syntax:

from typing import Dict, Union

def foo(i: int, d: Dict[str, Union[str, int]]) -> int:
    """
    Explanation: this function takes two arguments: `i` and `d`.
    `i` is annotated simply as `int`. `d` is a dictionary with `str` keys
    and values that can be either `str` or `int`.

    The return type is `int`.

    """

The main advantage of this syntax is that it is defined by the language and that it's unambiguous, so tools like PyCharm can easily take advantage from it.

Redirect within component Angular 2

first configure routing

import {RouteConfig, Router, ROUTER_DIRECTIVES} from 'angular2/router';

and

@RouteConfig([
  { path: '/addDisplay', component: AddDisplay, as: 'addDisplay' },
  { path: '/<secondComponent>', component: '<secondComponentName>', as: 'secondComponentAs' },
])

then in your component import and then inject Router

import {Router} from 'angular2/router'

export class AddDisplay {
  constructor(private router: Router)
}

the last thing you have to do is to call

this.router.navigateByUrl('<pathDefinedInRouteConfig>');

this.router.navigate(['<aliasInRouteConfig>']);

python: How do I know what type of exception occurred?

To add to Lauritz's answer, I created a decorator/wrapper for exception handling and the wrapper logs which type of exception occurred.

class general_function_handler(object):
    def __init__(self, func):
        self.func = func
    def __get__(self, obj, type=None):
        return self.__class__(self.func.__get__(obj, type))
    def __call__(self, *args, **kwargs):
        try:
            retval = self.func(*args, **kwargs)
        except Exception, e :
            logging.warning('Exception in %s' % self.func)
            template = "An exception of type {0} occured. Arguments:\n{1!r}"
            message = template.format(type(e).__name__, e.args)
            logging.exception(message)
            sys.exit(1) # exit on all exceptions for now
        return retval

This can be called on a class method or a standalone function with the decorator:

@general_function_handler

See my blog about for the full example: http://ryaneirwin.wordpress.com/2014/05/31/python-decorators-and-exception-handling/

Skipping error in for-loop

Here's a simple way

for (i in 1:10) {
  
  skip_to_next <- FALSE
  
  # Note that print(b) fails since b doesn't exist
  
  tryCatch(print(b), error = function(e) { skip_to_next <<- TRUE})
  
  if(skip_to_next) { next }     
}

Note that the loop completes all 10 iterations, despite errors. You can obviously replace print(b) with any code you want. You can also wrap many lines of code in { and } if you have more than one line of code inside the tryCatch

Bypass invalid SSL certificate errors when calling web services in .Net

Alternatively you can register a call back delegate which ignores the certification error:

...
ServicePointManager.ServerCertificateValidationCallback = MyCertHandler;
...

static bool MyCertHandler(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors error)
{
// Ignore errors
return true;
}

java.lang.IllegalStateException: Error processing condition on org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration

I know this is quite an old one, but I faced similar issue and resolved it in a different way. The actuator-autoconfigure pom somehow was invalid and so it was throwing IllegalStateException. I removed the actuator* dependencies from my maven repo and did a Maven update in eclipse, which then downloaded the correct/valid dependencies and resolved my issue.

PHP: HTML: send HTML select option attribute in POST

<form name="add" method="post">
     <p>Age:</p>
     <select name="age">
        <option value="1_sre">23</option>
        <option value="2_sam">24</option>
        <option value="5_john">25</option>
     </select>
     <input type="submit" name="submit"/>
</form>

You will have the selected value in $_POST['age'], e.g. 1_sre. Then you will be able to split the value and get the 'stud_name'.

$stud = explode("_",$_POST['age']);
$stud_id = $stud[0];
$stud_name = $stud[1];

Submit form with Enter key without submit button?

@JayGuilford's answer is a good one, but if you don't want a JS dependency, you could use a submit element and simply hide it using display: none;.

How to display an alert box from C# in ASP.NET?

If you don't have a Page.Redirect(), use this

Response.Write("<script>alert('Inserted successfully!')</script>"); //works great

But if you do have Page.Redirect(), use this

Response.Write("<script>alert('Inserted..');window.location = 'newpage.aspx';</script>"); //works great

works for me.

Hope this helps.

Is there a way to cast float as a decimal without rounding and preserving its precision?

Try SELECT CAST(field1 AS DECIMAL(10,2)) field1 and replace 10,2 with whatever precision you need.

What's the common practice for enums in Python?

I've seen this pattern several times:

>>> class Enumeration(object):
        def __init__(self, names):  # or *names, with no .split()
            for number, name in enumerate(names.split()):
                setattr(self, name, number)

>>> foo = Enumeration("bar baz quux")
>>> foo.quux
2

You can also just use class members, though you'll have to supply your own numbering:

>>> class Foo(object):
        bar  = 0
        baz  = 1
        quux = 2

>>> Foo.quux
2

If you're looking for something more robust (sparse values, enum-specific exception, etc.), try this recipe.

Javascript - validation, numbers only

// I use this jquery it works perfect, just add class nosonly to any textbox that should be numbers only:

$(document).ready(function () {
       $(".nosonly").keydown(function (event) {
           // Allow only backspace and delete
           if (event.keyCode == 46 || event.keyCode == 8) {
               // let it happen, don't do anything
           }
           else {
               // Ensure that it is a number and stop the keypress
               if (event.keyCode < 48 || event.keyCode > 57) {
              alert("Only Numbers Allowed"),event.preventDefault();
               }
           }
       });
   });

Wireshark localhost traffic capture

You can view loopback traffic live in Wireshark by having it read RawCap's output instantly. cmaynard describes this ingenious approach at the Wireshark forums. I will cite it here:

[...] if you want to view live traffic in Wireshark, you can still do it by running RawCap from one command-line and running Wireshark from another. Assuming you have cygwin's tail available, this could be accomplished using something like so:

cmd1: RawCap.exe -f 127.0.0.1 dumpfile.pcap

cmd2: tail -c +0 -f dumpfile.pcap | Wireshark.exe -k -i -

It requires cygwin's tail, and I could not find a way to do this with Windows' out-of-the-box tools. His approach works very fine for me and allows me to use all of Wiresharks filter capabilities on captured loopback traffic live.

Passing data between view controllers

After more research it seemed that protocols and delegates were the correct/Apple preferred way of doing this.

I ended up using this example (in the iPhone development SDK):

Sharing data between view controllers and other objects

It worked fine and allowed me to pass a string and an array forward and back between my views.

How set the android:gravity to TextView from Java side in Android

You should use textView.setGravity(Gravity.CENTER_HORIZONTAL);.

Remember that using

LinearLayout.LayoutParams layoutParams =new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
layoutParams2.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;

won't work. This will set the gravity for the widget and not for it's text.

Adding/removing items from a JavaScript object with jQuery

That's not JSON at all, it's just Javascript objects. JSON is a text representation of data, that uses a subset of the Javascript syntax.

The reason that you can't find any information about manipulating JSON using jQuery is because jQuery has nothing that can do that, and it's generally not done at all. You manipulate the data in the form of Javascript objects, and then turn it into a JSON string if that is what you need. (jQuery does have methods for the conversion, though.)

What you have is simply an object that contains an array, so you can use all the knowledge that you already have. Just use data.items to access the array.

For example, to add another item to the array using dynamic values:

// The values to put in the item
var id = 7;
var name = "The usual suspects";
var type = "crime";
// Create the item using the values
var item = { id: id, name: name, type: type };
// Add the item to the array
data.items.push(item);

Mockito. Verify method arguments

Verify(a).aFunc(eq(b))

In pseudocode:

When in the instance a - a function named aFunc is called.

Verify this call got an argument which is equal to b.

How to do exponential and logarithmic curve fitting in Python? I found only polynomial fitting

Well I guess you can always use:

np.log   -->  natural log
np.log10 -->  base 10
np.log2  -->  base 2

Slightly modifying IanVS's answer:

import numpy as np
import matplotlib.pyplot as plt
from scipy.optimize import curve_fit

def func(x, a, b, c):
  #return a * np.exp(-b * x) + c
  return a * np.log(b * x) + c

x = np.linspace(1,5,50)   # changed boundary conditions to avoid division by 0
y = func(x, 2.5, 1.3, 0.5)
yn = y + 0.2*np.random.normal(size=len(x))

popt, pcov = curve_fit(func, x, yn)

plt.figure()
plt.plot(x, yn, 'ko', label="Original Noised Data")
plt.plot(x, func(x, *popt), 'r-', label="Fitted Curve")
plt.legend()
plt.show()

This results in the following graph:

How do I vertically align text in a paragraph?

Alternative solution which scales for multi-line text:

Set vertical and horizontal padding to be (height - line-height) / 2

p.event_desc {
    font: bold 12px "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 14px;
    padding: 10.5px 0;
    margin: 0px;
}

UNIX export command

When you execute a program the child program inherits its environment variables from the parent. For instance if $HOME is set to /root in the parent then the child's $HOME variable is also set to /root.

This only applies to environment variable that are marked for export. If you set a variable at the command-line like

$ FOO="bar"

That variable will not be visible in child processes. Not unless you export it:

$ export FOO

You can combine these two statements into a single one in bash (but not in old-school sh):

$ export FOO="bar"

Here's a quick example showing the difference between exported and non-exported variables. To understand what's happening know that sh -c creates a child shell process which inherits the parent shell's environment.

$ FOO=bar
$ sh -c 'echo $FOO'

$ export FOO
$ sh -c 'echo $FOO'
bar

Note: To get help on shell built-in commands use help export. Shell built-ins are commands that are part of your shell rather than independent executables like /bin/ls.

npm ERR! network getaddrinfo ENOTFOUND

Make sure to use the latest npm version while installing packages using npm.

While installing JavaScript, mention the latest version of NodeJS. For example, while installing JavaScript using devtools, use the below code:

devtools i --javascript nodejs:10.15.1

This will download and install the mentioned NodeJS version. Try installing the packages with npm after updating the version. This worked for me.

Differences in boolean operators: & vs && and | vs ||

In Java, the single operators &, |, ^, ! depend on the operands. If both operands are ints, then a bitwise operation is performed. If both are booleans, a "logical" operation is performed.

If both operands mismatch, a compile time error is thrown.

The double operators &&, || behave similarly to their single counterparts, but both operands must be conditional expressions, for example:

if (( a < 0 ) && ( b < 0 )) { ... } or similarly, if (( a < 0 ) || ( b < 0 )) { ... }

source: java programming lang 4th ed

Filter values only if not null using lambda in Java8

In this particular example I think @Tagir is 100% correct get it into one filter and do the two checks. I wouldn't use Optional.ofNullable the Optional stuff is really for return types not to be doing logic... but really neither here nor there.

I wanted to point out that java.util.Objects has a nice method for this in a broad case, so you can do this:

cars.stream()
    .filter(Objects::nonNull)

Which will clear out your null objects. For anyone not familiar, that's the short-hand for the following:

cars.stream()
    .filter(car -> Objects.nonNull(car))

To partially answer the question at hand to return the list of car names that starts with "M":

cars.stream()
    .filter(car -> Objects.nonNull(car))
    .map(car -> car.getName())
    .filter(carName -> Objects.nonNull(carName))
    .filter(carName -> carName.startsWith("M"))
    .collect(Collectors.toList());

Once you get used to the shorthand lambdas you could also do this:

cars.stream()
    .filter(Objects::nonNull)
    .map(Car::getName)        // Assume the class name for car is Car
    .filter(Objects::nonNull)
    .filter(carName -> carName.startsWith("M"))
    .collect(Collectors.toList());

Unfortunately once you .map(Car::getName) you'll only be returning the list of names, not the cars. So less beautiful but fully answers the question:

cars.stream()
    .filter(car -> Objects.nonNull(car))
    .filter(car -> Objects.nonNull(car.getName()))
    .filter(car -> car.getName().startsWith("M"))
    .collect(Collectors.toList());

How to focus on a form input text field on page load using jQuery?

place after input

<script type="text/javascript">document.formname.inputname.focus();</script>

How to tell when UITableView has completed ReloadData?

You can use performBatchUpdates function of uitableview

Here is how you can achieve

self.tableView.performBatchUpdates({

      //Perform reload
        self.tableView.reloadData()
    }) { (completed) in

        //Reload Completed Use your code here
    }

Entity Framework Queryable async

There is a massive difference in the example you have posted, the first version:

var urls = await context.Urls.ToListAsync();

This is bad, it basically does select * from table, returns all results into memory and then applies the where against that in memory collection rather than doing select * from table where... against the database.

The second method will not actually hit the database until a query is applied to the IQueryable (probably via a linq .Where().Select() style operation which will only return the db values which match the query.

If your examples were comparable, the async version will usually be slightly slower per request as there is more overhead in the state machine which the compiler generates to allow the async functionality.

However the major difference (and benefit) is that the async version allows more concurrent requests as it doesn't block the processing thread whilst it is waiting for IO to complete (db query, file access, web request etc).

How to replace NaN values by Zeroes in a column of a Pandas Dataframe?

To replace na values in pandas

df['column_name'].fillna(value_to_be_replaced,inplace=True)

if inplace = False, instead of updating the df (dataframe) it will return the modified values.

Get PostGIS version

Other way to get the minor version is:

SELECT extversion
FROM pg_catalog.pg_extension
WHERE extname='postgis'

Code for printf function in C

Here's the GNU version of printf... you can see it passing in stdout to vfprintf:

__printf (const char *format, ...)
{
   va_list arg;
   int done;

   va_start (arg, format);
   done = vfprintf (stdout, format, arg);
   va_end (arg);

   return done;
}

See here.

Here's a link to vfprintf... all the formatting 'magic' happens here.

The only thing that's truly 'different' about these functions is that they use varargs to get at arguments in a variable length argument list. Other than that, they're just traditional C. (This is in contrast to Pascal's printf equivalent, which is implemented with specific support in the compiler... at least it was back in the day.)

entity framework Unable to load the specified metadata resource

Craig Stuntz has written an extensive (in my opinion) blog post on troubleshooting this exact error message, I personally would start there.

The following res: (resource) references need to point to your model.

<add name="Entities" connectionString="metadata=
    res://*/Models.WraithNath.co.uk.csdl|
    res://*/Models.WraithNath.co.uk.ssdl|
    res://*/Models.WraithNath.co.uk.msl;

Make sure each one has the name of your .edmx file after the "*/", with the "edmx" changed to the extension for that res (.csdl, .ssdl, or .msl).

It also may help to specify the assembly rather than using "//*/".

Worst case, you can check everything (a bit slower but should always find the resource) by using

<add name="Entities" connectionString="metadata=
        res://*/;provider= <!-- ... -->

How to reload current page in ReactJS?

This is my code .This works for me

componentDidMount(){
        axios.get('http://localhost:5000/supplier').then(
            response => {
                console.log(response)
                this.setState({suppliers:response.data.data})
            }
        )
        .catch(error => {
            console.log(error)
        })
        
    }

componentDidUpdate(){
        this.componentDidMount();
}

window.location.reload(); I think this thing is not good for react js

How do I initialize a TypeScript Object with a JSON-Object?

I personally prefer option #3 of @Ingo Bürk. And I improved his codes to support an array of complex data and Array of primitive data.

interface IDeserializable {
  getTypes(): Object;
}

class Utility {
  static deserializeJson<T>(jsonObj: object, classType: any): T {
    let instanceObj = new classType();
    let types: IDeserializable;
    if (instanceObj && instanceObj.getTypes) {
      types = instanceObj.getTypes();
    }

    for (var prop in jsonObj) {
      if (!(prop in instanceObj)) {
        continue;
      }

      let jsonProp = jsonObj[prop];
      if (this.isObject(jsonProp)) {
        instanceObj[prop] =
          types && types[prop]
            ? this.deserializeJson(jsonProp, types[prop])
            : jsonProp;
      } else if (this.isArray(jsonProp)) {
        instanceObj[prop] = [];
        for (let index = 0; index < jsonProp.length; index++) {
          const elem = jsonProp[index];
          if (this.isObject(elem) && types && types[prop]) {
            instanceObj[prop].push(this.deserializeJson(elem, types[prop]));
          } else {
            instanceObj[prop].push(elem);
          }
        }
      } else {
        instanceObj[prop] = jsonProp;
      }
    }

    return instanceObj;
  }

  //#region ### get types ###
  /**
   * check type of value be string
   * @param {*} value
   */
  static isString(value: any) {
    return typeof value === "string" || value instanceof String;
  }

  /**
   * check type of value be array
   * @param {*} value
   */
  static isNumber(value: any) {
    return typeof value === "number" && isFinite(value);
  }

  /**
   * check type of value be array
   * @param {*} value
   */
  static isArray(value: any) {
    return value && typeof value === "object" && value.constructor === Array;
  }

  /**
   * check type of value be object
   * @param {*} value
   */
  static isObject(value: any) {
    return value && typeof value === "object" && value.constructor === Object;
  }

  /**
   * check type of value be boolean
   * @param {*} value
   */
  static isBoolean(value: any) {
    return typeof value === "boolean";
  }
  //#endregion
}

// #region ### Models ###
class Hotel implements IDeserializable {
  id: number = 0;
  name: string = "";
  address: string = "";
  city: City = new City(); // complex data
  roomTypes: Array<RoomType> = []; // array of complex data
  facilities: Array<string> = []; // array of primitive data

  // getter example
  get nameAndAddress() {
    return `${this.name} ${this.address}`;
  }

  // function example
  checkRoom() {
    return true;
  }

  // this function will be use for getting run-time type information
  getTypes() {
    return {
      city: City,
      roomTypes: RoomType
    };
  }
}

class RoomType implements IDeserializable {
  id: number = 0;
  name: string = "";
  roomPrices: Array<RoomPrice> = [];

  // getter example
  get totalPrice() {
    return this.roomPrices.map(x => x.price).reduce((a, b) => a + b, 0);
  }

  getTypes() {
    return {
      roomPrices: RoomPrice
    };
  }
}

class RoomPrice {
  price: number = 0;
  date: string = "";
}

class City {
  id: number = 0;
  name: string = "";
}
// #endregion

// #region ### test code ###
var jsonObj = {
  id: 1,
  name: "hotel1",
  address: "address1",
  city: {
    id: 1,
    name: "city1"
  },
  roomTypes: [
    {
      id: 1,
      name: "single",
      roomPrices: [
        {
          price: 1000,
          date: "2020-02-20"
        },
        {
          price: 1500,
          date: "2020-02-21"
        }
      ]
    },
    {
      id: 2,
      name: "double",
      roomPrices: [
        {
          price: 2000,
          date: "2020-02-20"
        },
        {
          price: 2500,
          date: "2020-02-21"
        }
      ]
    }
  ],
  facilities: ["facility1", "facility2"]
};

var hotelInstance = Utility.deserializeJson<Hotel>(jsonObj, Hotel);

console.log(hotelInstance.city.name);
console.log(hotelInstance.nameAndAddress); // getter
console.log(hotelInstance.checkRoom()); // function
console.log(hotelInstance.roomTypes[0].totalPrice); // getter
// #endregion

SDK Location not found Android Studio + Gradle

specifying sdk.dir=<SDK_PATH> in local.properties in root folder solved my problem.

Android sqlite how to check if a record exists

You can use SELECT EXISTS command and execute it for a cursor using a rawQuery, from the documentation

The EXISTS operator always evaluates to one of the integer values 0 and 1. If executing the SELECT statement specified as the right-hand operand of the EXISTS operator would return one or more rows, then the EXISTS operator evaluates to 1. If executing the SELECT would return no rows at all, then the EXISTS operator evaluates to 0.

How can I render HTML from another file in a React component?

You can use the dangerouslySetInnerHTML property to inject arbitrary HTML:

_x000D_

// Assume from another require()'ed module:_x000D_
var html = '<h1>Hello, world!</h1>'_x000D_
_x000D_
var MyComponent = React.createClass({_x000D_
  render: function() {_x000D_
    return React.createElement("h1", {dangerouslySetInnerHTML: {__html: html}})_x000D_
  }_x000D_
})_x000D_
_x000D_
ReactDOM.render(React.createElement(MyComponent), document.getElementById('app'))

_x000D_

<script src="https://fb.me/react-0.14.3.min.js"></script>_x000D_
<script src="https://fb.me/react-dom-0.14.3.min.js"></script>_x000D_
<div id="app"></div>

_x000D_

You could even componentize this template behavior (untested):

class TemplateComponent extends React.Component {
  constructor(props) {
    super(props)
    this.html = require(props.template)
  }

  render() {
    return <div dangerouslySetInnerHTML={{__html: this.html}}/>
  }

}

TemplateComponent.propTypes = {
  template: React.PropTypes.string.isRequired
}

// use like
<TemplateComponent template='./template.html'/>

And with this, template.html (in the same directory) looks something like (again, untested):

// ./template.html
module.exports = '<h1>Hello, world!</h1>'

How to stick text to the bottom of the page?

Try:

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

How to delete mysql database through shell command

[root@host]# mysqladmin -u root -p drop [DB]

Enter password:******

matrix multiplication algorithm time complexity

The naive algorithm, which is what you've got once you correct it as noted in comments, is O(n^3).

There do exist algorithms that reduce this somewhat, but you're not likely to find an O(n^2) implementation. I believe the question of the most efficient implementation is still open.

See this wikipedia article on Matrix Multiplication for more information.

initialize a const array in a class initializer in C++

interestingly, in C# you have the keyword const that translates to C++'s static const, as opposed to readonly which can be only set at constructors and initializations, even by non-constants, ex:

readonly DateTime a = DateTime.Now;

I agree, if you have a const pre-defined array you might as well make it static. At that point you can use this interesting syntax:

//in header file
class a{
    static const int SIZE;
    static const char array[][10];
};
//in cpp file:
const int a::SIZE = 5;
const char array[SIZE][10] = {"hello", "cruel","world","goodbye", "!"};

however, I did not find a way around the constant '10'. The reason is clear though, it needs it to know how to perform accessing to the array. A possible alternative is to use #define, but I dislike that method and I #undef at the end of the header, with a comment to edit there at CPP as well in case if a change.

How to change python version in anaconda spyder

Set python3 as a main version in the terminal: ln -sf python3 /usr/bin/python
Install pip3: apt-get install python3-pip
Update spyder: pip install -U spyder

Enjoy

python NameError: global name 'file' is not defined

Are you using the interactive interpreter? You can use

sys.argv[0]

You should read: How do I get the path of the current executed file in Python?

Seedable JavaScript random number generator

If you program in Typescript, I adapted the Mersenne Twister implementation that was brought in Christoph Henkelmann's answer to this thread as a typescript class:

/**
 * copied almost directly from Mersenne Twister implementation found in https://gist.github.com/banksean/300494
 * all rights reserved to him.
 */
export class Random {
    static N = 624;
    static M = 397;
    static MATRIX_A = 0x9908b0df;
    /* constant vector a */
    static UPPER_MASK = 0x80000000;
    /* most significant w-r bits */
    static LOWER_MASK = 0x7fffffff;
    /* least significant r bits */

    mt = new Array(Random.N);
    /* the array for the state vector */
    mti = Random.N + 1;
    /* mti==N+1 means mt[N] is not initialized */

    constructor(seed:number = null) {
        if (seed == null) {
            seed = new Date().getTime();
        }

        this.init_genrand(seed);
    }

    private init_genrand(s:number) {
        this.mt[0] = s >>> 0;
        for (this.mti = 1; this.mti < Random.N; this.mti++) {
            var s = this.mt[this.mti - 1] ^ (this.mt[this.mti - 1] >>> 30);
            this.mt[this.mti] = (((((s & 0xffff0000) >>> 16) * 1812433253) << 16) + (s & 0x0000ffff) * 1812433253)
                + this.mti;
            /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
            /* In the previous versions, MSBs of the seed affect   */
            /* only MSBs of the array mt[].                        */
            /* 2002/01/09 modified by Makoto Matsumoto             */
            this.mt[this.mti] >>>= 0;
            /* for >32 bit machines */
        }
    }

    /**
     * generates a random number on [0,0xffffffff]-interval
     * @private
     */
    private _nextInt32():number {
        var y:number;
        var mag01 = new Array(0x0, Random.MATRIX_A);
        /* mag01[x] = x * MATRIX_A  for x=0,1 */

        if (this.mti >= Random.N) { /* generate N words at one time */
            var kk:number;

            if (this.mti == Random.N + 1)   /* if init_genrand() has not been called, */
                this.init_genrand(5489);
            /* a default initial seed is used */

            for (kk = 0; kk < Random.N - Random.M; kk++) {
                y = (this.mt[kk] & Random.UPPER_MASK) | (this.mt[kk + 1] & Random.LOWER_MASK);
                this.mt[kk] = this.mt[kk + Random.M] ^ (y >>> 1) ^ mag01[y & 0x1];
            }
            for (; kk < Random.N - 1; kk++) {
                y = (this.mt[kk] & Random.UPPER_MASK) | (this.mt[kk + 1] & Random.LOWER_MASK);
                this.mt[kk] = this.mt[kk + (Random.M - Random.N)] ^ (y >>> 1) ^ mag01[y & 0x1];
            }
            y = (this.mt[Random.N - 1] & Random.UPPER_MASK) | (this.mt[0] & Random.LOWER_MASK);
            this.mt[Random.N - 1] = this.mt[Random.M - 1] ^ (y >>> 1) ^ mag01[y & 0x1];

            this.mti = 0;
        }

        y = this.mt[this.mti++];

        /* Tempering */
        y ^= (y >>> 11);
        y ^= (y << 7) & 0x9d2c5680;
        y ^= (y << 15) & 0xefc60000;
        y ^= (y >>> 18);

        return y >>> 0;
    }

    /**
     * generates an int32 pseudo random number
     * @param range: an optional [from, to] range, if not specified the result will be in range [0,0xffffffff]
     * @return {number}
     */
    nextInt32(range:[number, number] = null):number {
        var result = this._nextInt32();
        if (range == null) {
            return result;
        }

        return (result % (range[1] - range[0])) + range[0];
    }

    /**
     * generates a random number on [0,0x7fffffff]-interval
     */
    nextInt31():number {
        return (this._nextInt32() >>> 1);
    }

    /**
     * generates a random number on [0,1]-real-interval
     */
    nextNumber():number {
        return this._nextInt32() * (1.0 / 4294967295.0);
    }

    /**
     * generates a random number on [0,1) with 53-bit resolution
     */
    nextNumber53():number {
        var a = this._nextInt32() >>> 5, b = this._nextInt32() >>> 6;
        return (a * 67108864.0 + b) * (1.0 / 9007199254740992.0);
    }
}

you can than use it as follows:

var random = new Random(132);
random.nextInt32(); //return a pseudo random int32 number
random.nextInt32([10,20]); //return a pseudo random int in range [10,20]
random.nextNumber(); //return a a pseudo random number in range [0,1]

check the source for more methods.

Inline functions in C#?

Finally in .NET 4.5, the CLR allows one to hint/suggest¹ method inlining using MethodImplOptions.AggressiveInlining value. It is also available in the Mono's trunk (committed today).

// The full attribute usage is in mscorlib.dll,
// so should not need to include extra references
using System.Runtime.CompilerServices; 

...

[MethodImpl(MethodImplOptions.AggressiveInlining)]
void MyMethod(...)

1. Previously "force" was used here. Since there were a few downvotes, I'll try to clarify the term. As in the comments and the documentation, The method should be inlined if possible. Especially considering Mono (which is open), there are some mono-specific technical limitations considering inlining or more general one (like virtual functions). Overall, yes, this is a hint to compiler, but I guess that is what was asked for.

How do I convert a long to a string in C++?

You could use stringstream.

#include <sstream>

// ...
std::string number;
std::stringstream strstream;
strstream << 1L;
strstream >> number;

There is usually some proprietary C functions in the standard library for your compiler that does it too. I prefer the more "portable" variants though.

The C way to do it would be with sprintf, but that is not very secure. In some libraries there is new versions like sprintf_s which protects against buffer overruns.

How to output (to a log) a multi-level array in a format that is human-readable?

Syntax

print_r(variable, return);

variable Required. Specifies the variable to return information about

return Optional. When set to true, this function will return the information (not print it). Default is false

Example

error_log( print_r(<array Variable>, TRUE) );

How to bind multiple values to a single WPF TextBlock?

If these are just going to be textblocks (and thus one way binding), and you just want to concatenate values, just bind two textblocks and put them in a horizontal stackpanel.

    <StackPanel Orientation="Horizontal">
        <TextBlock Text="{Binding Name}"/>
        <TextBlock Text="{Binding ID}"/>
    </StackPanel>

That will display the text (which is all Textblocks do) without having to do any more coding. You might put a small margin on them to make them look right though.

Bootstrap change div order with pull-right, pull-left on 3 columns

Bootstrap 3

Using Bootstrap 3's grid system:

<div class="container">
  <div class="row">
    <div class="col-xs-4">Menu</div>
    <div class="col-xs-8">
      <div class="row">
        <div class="col-md-4 col-md-push-8">Right Content</div>
        <div class="col-md-8 col-md-pull-4">Content</div>
      </div>
    </div>
  </div>
</div>

Working example: http://bootply.com/93614

Explanation

First, we set two columns that will stay in place no matter the screen resolution (col-xs-*).

Next, we divide the larger, right hand column in to two columns that will collapse on top of each other on tablet sized devices and lower (col-md-*).

Finally, we shift the display order using the matching class (col-md-[push|pull]-*). You push the first column over by the amount of the second, and pull the second by the amount of the first.

How to check if a registry value exists using C#?

public static bool RegistryValueExists(string hive_HKLM_or_HKCU, string registryRoot, string valueName)
{
    RegistryKey root;
    switch (hive_HKLM_or_HKCU.ToUpper())
    {
        case "HKLM":
            root = Registry.LocalMachine.OpenSubKey(registryRoot, false);
            break;
        case "HKCU":
            root = Registry.CurrentUser.OpenSubKey(registryRoot, false);
            break;
        default:
            throw new System.InvalidOperationException("parameter registryRoot must be either \"HKLM\" or \"HKCU\"");
    }

    return root.GetValue(valueName) != null;
}

java.net.UnknownHostException: Invalid hostname for server: local

I had this issue in my android app when grabbing an xml file the format of my link was not valid, I reformatted with the full url and it worked.

Classes cannot be accessed from outside package

Let me guess

Your initial declaration of class PUBLICClass was not public, then you made it `Public', can you try to clean and rebuild your project ?

What is the difference between 'typedef' and 'using' in C++11?

They are largely the same, except that:

The alias declaration is compatible with templates, whereas the C style typedef is not.

How do I insert a drop-down menu for a simple Windows Forms app in Visual Studio 2008?

You can use ComboBox, then point your mouse to the upper arrow facing right, it will unfold a box called ComboBox Tasks and in there you can go ahead and edit your items or fill in the items / strings one per line. This should be the easiest.

jQuery change URL of form submit

Try using this:

$(".move_to").on("click", function(e){
    e.preventDefault();
    $('#contactsForm').attr('action', "/test1").submit();
});

Moving the order in which you use .preventDefault() might fix your issue. You also didn't use function(e) so e.preventDefault(); wasn't working.

Here it is working: http://jsfiddle.net/TfTwe/1/ - first of all, click the 'Check action attribute.' link. You'll get an alert saying undefined. Then click 'Set action attribute.' and click 'Check action attribute.' again. You'll see that the form's action attribute has been correctly set to /test1.

Repeat string to certain length

Jason Scheirer's answer is correct but could use some more exposition.

First off, to repeat a string an integer number of times, you can use overloaded multiplication:

>>> 'abc' * 7
'abcabcabcabcabcabcabc'

So, to repeat a string until it's at least as long as the length you want, you calculate the appropriate number of repeats and put it on the right-hand side of that multiplication operator:

def repeat_to_at_least_length(s, wanted):
    return s * (wanted//len(s) + 1)

>>> repeat_to_at_least_length('abc', 7)
'abcabcabc'

Then, you can trim it to the exact length you want with an array slice:

def repeat_to_length(s, wanted):
    return (s * (wanted//len(s) + 1))[:wanted]

>>> repeat_to_length('abc', 7)
'abcabca'

Alternatively, as suggested in pillmod's answer that probably nobody scrolls down far enough to notice anymore, you can use divmod to compute the number of full repetitions needed, and the number of extra characters, all at once:

def pillmod_repeat_to_length(s, wanted):
    a, b = divmod(wanted, len(s))
    return s * a + s[:b]

Which is better? Let's benchmark it:

>>> import timeit
>>> timeit.repeat('scheirer_repeat_to_length("abcdefg", 129)', globals=globals())
[0.3964178159367293, 0.32557755894958973, 0.32851039397064596]
>>> timeit.repeat('pillmod_repeat_to_length("abcdefg", 129)', globals=globals())
[0.5276265419088304, 0.46511475392617285, 0.46291469305288047]

So, pillmod's version is something like 40% slower, which is too bad, since personally I think it's much more readable. There are several possible reasons for this, starting with its compiling to about 40% more bytecode instructions.

Note: these examples use the new-ish // operator for truncating integer division. This is often called a Python 3 feature, but according to PEP 238, it was introduced all the way back in Python 2.2. You only have to use it in Python 3 (or in modules that have from __future__ import division) but you can use it regardless.

onclick go full screen

var elem = document.getElementById("myvideo");
function openFullscreen() {
  if (elem.requestFullscreen) {
      elem.requestFullscreen();
  } else if (elem.mozRequestFullScreen) { /* Firefox */
      elem.mozRequestFullScreen();
  } else if (elem.webkitRequestFullscreen) { /* Chrome, Safari & Opera */
      elem.webkitRequestFullscreen();
  } else if (elem.msRequestFullscreen) { /* IE/Edge */
      elem.msRequestFullscreen();
  }
}
//Internet Explorer 10 and earlier does not support the msRequestFullscreen() method.

How to use SQL LIKE condition with multiple values in PostgreSQL?

Perhaps using SIMILAR TO would work ?

SELECT * from table WHERE column SIMILAR TO '(AAA|BBB|CCC)%';

Is there a short contains function for lists?

In addition to what other have said, you may also be interested to know that what in does is to call the list.__contains__ method, that you can define on any class you write and can get extremely handy to use python at his full extent.

A dumb use may be:

>>> class ContainsEverything:
    def __init__(self):
        return None
    def __contains__(self, *elem, **k):
        return True


>>> a = ContainsEverything()
>>> 3 in a
True
>>> a in a
True
>>> False in a
True
>>> False not in a
False
>>>

Convert column classes in data.table

If you have a list of column names in data.table, you want to change the class of do:

convert_to_character <- c("Quarter", "value")

dt[, convert_to_character] <- dt[, lapply(.SD, as.character), .SDcols = convert_to_character]

CSS fixed width in a span

In an ideal world you'd achieve this simply using the following css

<style type="text/css">

span {
  display: inline-block;
  width: 50px;
}

</style>

This works on all browsers apart from FF2 and below.

Firefox 2 and lower don't support this value. You can use -moz-inline-box, but be aware that it's not the same as inline-block, and it may not work as you expect in some situations.

Quote taken from quirksmode

Deny access to one specific folder in .htaccess

In an .htaccess file you need to use

Deny from  all

Put this in site/includes/.htaccess to make it specific to the includes directory

If you just wish to disallow a listing of directory files you can use

Options -Indexes

Programs & Examples On #Canonical form

Is it possible to add an HTML link in the body of a MAILTO link

Why does Vim save files with a ~ extension?

React Native TextInput that only accepts numeric characters

What causes an HTTP 405 "invalid method (HTTP verb)" error when POSTing a form to PHP on IIS?

Can overridden methods differ in return type?

How can you get the first digit in an int (C#)?

Allowing the "Enter" key to press the submit button, as opposed to only using MouseClick

Displaying splash screen for longer than default seconds

How can I hide an HTML table row <tr> so that it takes up no space?

Create empty data frame with column names by assigning a string vector?

org.springframework.web.client.HttpClientErrorException: 400 Bad Request

trying to animate a constraint in swift

python getoutput() equivalent in subprocess

Is try-catch like error handling possible in ASP Classic?

How to set up subdomains on IIS 7

Pandas sort by group aggregate and column

Safely casting long to int in Java

Catching access violation exceptions?

Removing single-quote from a string in php

Unable to Build using MAVEN with ERROR - Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile

Link vs compile vs controller

Does Python have a string 'contains' substring method?

Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio

List method to delete last element in list as well as all elements

How to change the current URL in javascript?

Pandas Split Dataframe into two Dataframes at a specific row

Does the join order matter in SQL?

NSString with \n or line break

Have log4net use application config file for configuration data

How can I check if a Perl module is installed on my system from the command line?

Declare global variables in Visual Studio 2010 and VB.NET

Best way to format integer as string with leading zeros?

Retrieve WordPress root directory path?

Run Button is Disabled in Android Studio

Jenkins - How to access BUILD_NUMBER environment variable

Can Windows' built-in ZIP compression be scripted?

Remove a data connection from an Excel 2010 spreadsheet in compatibility mode

How to get text with Selenium WebDriver in Python

Create a user with all privileges in Oracle

What are native methods in Java and where should they be used?

"The certificate chain was issued by an authority that is not trusted" when connecting DB in VM Role from Azure website

Html.EditorFor Set Default Value

How can I find a specific element in a List<T>?

Is there a simple way to convert C++ enum to string?

How to post query parameters with Axios?

Verify object attribute value with mockito

Secure random token in Node.js

How to host material icons offline?

What do I need to do to get Internet Explorer 8 to accept a self signed certificate?

Javascript ajax call on page onload

SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'

Query to get only numbers from a string

How to get filename without extension from file path in Ruby

How to Call a JS function using OnClick event

In Node.js, how do I turn a string to a json?

How to search in a List of Java object

The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Get multiple elements by Id

I forgot the password I entered during postgres installation

How can I compile LaTeX in UTF8?

iOS 7 - Status bar overlaps the view

ImportError: No module named sklearn.cross_validation

Is it a good practice to use an empty URL for a HTML form's action attribute? (action="")

How to fill Matrix with zeros in OpenCV?

How do I parse a URL into hostname and path in javascript?

How to create a list of objects?

cast class into another class or convert class to another

How to open Form in Add record

JavaScript + Unicode regexes

Situation for ES 6

Situation for ES 5 and below

Python slice first and last element in list

How to launch another aspx web page upon button click?

NSURLConnection Using iOS Swift

How to generate random colors in matplotlib?

Eclipse says: “Workspace in use or cannot be created, chose a different one.” How do I unlock a workspace?

If WorkSheet("wsName") Exists

Select 2 columns in one and combine them

iPad Safari scrolling causes HTML elements to disappear and reappear with a delay