#Puid | Programs & Examples on Puid

Genymotion, "Unable to load VirtualBox engine." on Mavericks. VBox is setup correctly

It happens when upgrading to el capitan from yosemite. Virtual box needs to be installed again. Reinstalling geny motion does nothing. You will keep all your virtual devices unchanged.

AND/OR in Python?

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

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

How to Call VBA Function from Excel Cells?

Here's the answer

Steps to follow:

Open the Visual Basic Editor. In Excel, hit Alt+F11 if on Windows, Fn+Option+F11 if on a Mac.
Insert a new module. From the menu: Insert -> Module (Don't skip this!).

Create a Public function. Example:

Public Function findArea(ByVal width as Double, _
                         ByVal height as Double) As Double
    ' Return the area
    findArea = width * height
End Function

Then use it in any cell like you would any other function: =findArea(B12,C12).

How to apply multiple transforms in CSS?

Transform Rotate and Translate in single line css:-How?

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div.className{_x000D_
    transform : rotate(270deg) translate(-50%, 0);    _x000D_
    -webkit-transform: rotate(270deg) translate(-50%, -50%);    _x000D_
    -moz-transform: rotate(270deg) translate(-50%, -50%);    _x000D_
    -ms-transform: rotate(270deg) translate(-50%, -50%);    _x000D_
    -o-transform: rotate(270deg) translate(-50%, -50%); _x000D_
    float:left;_x000D_
    position:absolute;_x000D_
    top:50%;_x000D_
    left:50%;_x000D_
    }

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<html>_x000D_
<head>_x000D_
</head>_x000D_
<body>_x000D_
<div class="className">_x000D_
  <span style="font-size:50px">A</span>_x000D_
</div>_x000D_
</body>_x000D_
</html>

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Is it possible to change the content HTML5 alert messages?

Thank you guys for the help,

When I asked at first I didn't think it's even possible, but after your answers I googled and found this amazing tutorial:

http://blog.thomaslebrun.net/2011/11/html-5-how-to-customize-the-error-message-for-a-required-field/#.UsNN1BYrh2M

How to get all selected values from <select multiple=multiple>?

Actually, I found the best, most-succinct, fastest, and most-compatible way using pure JavaScript (assuming you don't need to fully support IE lte 8) is the following:

var values = Array.prototype.slice.call(document.querySelectorAll('#select-meal-type option:checked'),0).map(function(v,i,a) { 
    return v.value; 
});

UPDATE (2017-02-14):

An even more succinct way using ES6/ES2015 (for the browsers that support it):

const selected = document.querySelectorAll('#select-meal-type option:checked');
const values = Array.from(selected).map(el => el.value);

How to convert signed to unsigned integer in python

Assuming:

You have 2's-complement representations in mind; and,
By (unsigned long) you mean unsigned 32-bit integer,

then you just need to add 2**32 (or 1 << 32) to the negative value.

For example, apply this to -1:

>>> -1
-1
>>> _ + 2**32
4294967295L
>>> bin(_)
'0b11111111111111111111111111111111'

Assumption #1 means you want -1 to be viewed as a solid string of 1 bits, and assumption #2 means you want 32 of them.

Nobody but you can say what your hidden assumptions are, though. If, for example, you have 1's-complement representations in mind, then you need to apply the ~ prefix operator instead. Python integers work hard to give the illusion of using an infinitely wide 2's complement representation (like regular 2's complement, but with an infinite number of "sign bits").

And to duplicate what the platform C compiler does, you can use the ctypes module:

>>> import ctypes
>>> ctypes.c_ulong(-1)  # stuff Python's -1 into a C unsigned long
c_ulong(4294967295L)
>>> _.value
4294967295L

C's unsigned long happens to be 4 bytes on the box that ran this sample.

Turning Sonar off for certain code

I not be able to find squid number in sonar 5.6, with this annotation also works:

@SuppressWarnings({"pmd:AvoidCatchingGenericException", "checkstyle:com.puppycrawl.tools.checkstyle.checks.coding.IllegalCatchCheck"})

How to work on UAC when installing XAMPP

This is a specific issue for Windows Vista, 7, 8 (and presumably newer).

User Account Control (UAC) is a feature in Windows that can help you stay in control of your computer by informing you when a program makes a change that requires administrator-level permission. UAC works by adjusting the permission level of your user account.

This is applied mostly to C:\Program Files. You may have noticed sometimes, that some applications can see files in C:\Program Files that does not exist there. You know why? Windows now tend to have "C:\Program Files" folder customized for every user. For example, old applications store config files (like .ini) in the same folder where the executable files are stored. In the good old days all users had the same configurations for such apps. In nowadays Windows stores configs in the special folder tied to the user account. Thus, now different users may have different configs while application still think that config files are in the same folder with the executables.

XAMPP does not like to have different config for different users. In fact it is not a config file for XAMPP, it is folders where you keep your projects and databases. The idea of XAMPP is to make projects same for all users. This is a source of a conflict with Windows.

All you need is to avoid installing XAMPP into C:\Program Files. Thus XAMPP will always use the original files for all users and there would be no confusion.

I recommend to install XAMPP into the special folder in root directory like in C:\XAMPP. But before you choose the folder you need to click on this warning message.

Missing `server' JVM (Java\jre7\bin\server\jvm.dll.)

To Fix The "Missing "server" JVM at C:\Program Files\Java\jre7\bin\server\jvm.dll, please install or use the JRE or JDK that contains these missing components.

Follow these steps:

Go to oracle.com and install Java JRE7 (Check if Java 6 is not installed already)

After that, go to C:/Program files/java/jre7/bin

Here, create an folder called Server

Now go into the C:/Program files/java/jre7/bin/client folder

Copy all the data in this folder into the new C:/Program files/java/jre7/bin/Server folder

Converting double to integer in Java

Double perValue = 96.57;
int roundVal= (int) Math.round(perValue);

Solved my purpose.

Why is pydot unable to find GraphViz's executables in Windows 8?

I am not using a windows machine, I am on a linux platform. I ran across this executable-not-found issue in the context of using the python package pyAgrum for plotting bayesian networks. pyAgrum uses graphviz to plot the networks. I installed pyagrum and graphviz using the anaconda platform in a python 3.6.4 environment (i.e. conda install <package name>).

I found the executables in /conda/envs/<environment name>/bin directory. So, it was just a matter of getting my notebook kernel to find them.

If you import os, use the command os.environ['PATH'].split(os.pathsep) to see the executable paths in which your environment is looking. If the path containing your graphviz executables isn't in there, you can add it by doing the following: os.environ['PATH'] += os.pathsep + <path to executables>.

I imagine this solution will work outside of my context. The main downside to this solution is that you need to do it every time you restart the kernel.

Get a list of distinct values in List

Notes.Select(x => x.Author).Distinct();

This will return a sequence (IEnumerable<string>) of Author values -- one per unique value.

Loop until a specific user input

As an alternative to @Mark Byers' approach, you can use while True:

guess = 50     # this should be outside the loop, I think
while True:    # infinite loop
    n = raw_input("\n\nTrue, False or Correct?: ")
    if n == "Correct":
        break  # stops the loop
    elif n == "True":
        # etc.

Understanding typedefs for function pointers in C

Consider the signal() function from the C standard:

extern void (*signal(int, void(*)(int)))(int);

Perfectly obscurely obvious - it's a function that takes two arguments, an integer and a pointer to a function that takes an integer as an argument and returns nothing, and it (signal()) returns a pointer to a function that takes an integer as an argument and returns nothing.

If you write:

typedef void (*SignalHandler)(int signum);

then you can instead declare signal() as:

extern  SignalHandler signal(int signum, SignalHandler handler);

This means the same thing, but is usually regarded as somewhat easier to read. It is clearer that the function takes an int and a SignalHandler and returns a SignalHandler.

It takes a bit of getting used to, though. The one thing you can't do, though is write a signal handler function using the SignalHandler typedef in the function definition.

I'm still of the old-school that prefers to invoke a function pointer as:

(*functionpointer)(arg1, arg2, ...);

Modern syntax uses just:

functionpointer(arg1, arg2, ...);

I can see why that works - I just prefer to know that I need to look for where the variable is initialized rather than for a function called functionpointer.

Sam commented:

I have seen this explanation before. And then, as is the case now, I think what I didn't get was the connection between the two statements:
    extern void (*signal(int, void()(int)))(int);  /*and*/

    typedef void (*SignalHandler)(int signum);
    extern SignalHandler signal(int signum, SignalHandler handler);
Or, what I want to ask is, what is the underlying concept that one can use to come up with the second version you have? What is the fundamental that connects "SignalHandler" and the first typedef? I think what needs to be explained here is what is typedef is actually doing here.

Let's try again. The first of these is lifted straight from the C standard - I retyped it, and checked that I had the parentheses right (not until I corrected it - it is a tough cookie to remember).

First of all, remember that typedef introduces an alias for a type. So, the alias is SignalHandler, and its type is:

a pointer to a function that takes an integer as an argument and returns nothing.

The 'returns nothing' part is spelled void; the argument that is an integer is (I trust) self-explanatory. The following notation is simply (or not) how C spells pointer to function taking arguments as specified and returning the given type:

type (*function)(argtypes);

After creating the signal handler type, I can use it to declare variables and so on. For example:

static void alarm_catcher(int signum)
{
    fprintf(stderr, "%s() called (%d)\n", __func__, signum);
}

static void signal_catcher(int signum)
{
    fprintf(stderr, "%s() called (%d) - exiting\n", __func__, signum);
    exit(1);
}

static struct Handlers
{
    int              signum;
    SignalHandler    handler;
} handler[] =
{
    { SIGALRM,   alarm_catcher  },
    { SIGINT,    signal_catcher },
    { SIGQUIT,   signal_catcher },
};

int main(void)
{
    size_t num_handlers = sizeof(handler) / sizeof(handler[0]);
    size_t i;

    for (i = 0; i < num_handlers; i++)
    {
        SignalHandler old_handler = signal(handler[i].signum, SIG_IGN);
        if (old_handler != SIG_IGN)
            old_handler = signal(handler[i].signum, handler[i].handler);
        assert(old_handler == SIG_IGN);
    }

    ...continue with ordinary processing...

    return(EXIT_SUCCESS);
}

^{Please note How to avoid using printf() in a signal handler?}

So, what have we done here - apart from omit 4 standard headers that would be needed to make the code compile cleanly?

The first two functions are functions that take a single integer and return nothing. One of them actually doesn't return at all thanks to the exit(1); but the other does return after printing a message. Be aware that the C standard does not permit you to do very much inside a signal handler; POSIX is a bit more generous in what is allowed, but officially does not sanction calling fprintf(). I also print out the signal number that was received. In the alarm_handler() function, the value will always be SIGALRM as that is the only signal that it is a handler for, but signal_handler() might get SIGINT or SIGQUIT as the signal number because the same function is used for both.

Then I create an array of structures, where each element identifies a signal number and the handler to be installed for that signal. I've chosen to worry about 3 signals; I'd often worry about SIGHUP, SIGPIPE and SIGTERM too and about whether they are defined (#ifdef conditional compilation), but that just complicates things. I'd also probably use POSIX sigaction() instead of signal(), but that is another issue; let's stick with what we started with.

The main() function iterates over the list of handlers to be installed. For each handler, it first calls signal() to find out whether the process is currently ignoring the signal, and while doing so, installs SIG_IGN as the handler, which ensures that the signal stays ignored. If the signal was not previously being ignored, it then calls signal() again, this time to install the preferred signal handler. (The other value is presumably SIG_DFL, the default signal handler for the signal.) Because the first call to 'signal()' set the handler to SIG_IGN and signal() returns the previous error handler, the value of old after the if statement must be SIG_IGN - hence the assertion. (Well, it could be SIG_ERR if something went dramatically wrong - but then I'd learn about that from the assert firing.)

The program then does its stuff and exits normally.

Note that the name of a function can be regarded as a pointer to a function of the appropriate type. When you do not apply the function-call parentheses - as in the initializers, for example - the function name becomes a function pointer. This is also why it is reasonable to invoke functions via the pointertofunction(arg1, arg2) notation; when you see alarm_handler(1), you can consider that alarm_handler is a pointer to the function and therefore alarm_handler(1) is an invocation of a function via a function pointer.

So, thus far, I've shown that a SignalHandler variable is relatively straight-forward to use, as long as you have some of the right type of value to assign to it - which is what the two signal handler functions provide.

Now we get back to the question - how do the two declarations for signal() relate to each other.

Let's review the second declaration:

 extern SignalHandler signal(int signum, SignalHandler handler);

If we changed the function name and the type like this:

 extern double function(int num1, double num2);

you would have no problem interpreting this as a function that takes an int and a double as arguments and returns a double value (would you? maybe you'd better not 'fess up if that is problematic - but maybe you should be cautious about asking questions as hard as this one if it is a problem).

Now, instead of being a double, the signal() function takes a SignalHandler as its second argument, and it returns one as its result.

The mechanics by which that can also be treated as:

extern void (*signal(int signum, void(*handler)(int signum)))(int signum);

are tricky to explain - so I'll probably screw it up. This time I've given the parameters names - though the names aren't critical.

In general, in C, the declaration mechanism is such that if you write:

type var;

then when you write var it represents a value of the given type. For example:

int     i;            // i is an int
int    *ip;           // *ip is an int, so ip is a pointer to an integer
int     abs(int val); // abs(-1) is an int, so abs is a (pointer to a)
                      // function returning an int and taking an int argument

In the standard, typedef is treated as a storage class in the grammar, rather like static and extern are storage classes.

typedef void (*SignalHandler)(int signum);

means that when you see a variable of type SignalHandler (say alarm_handler) invoked as:

(*alarm_handler)(-1);

the result has type void - there is no result. And (*alarm_handler)(-1); is an invocation of alarm_handler() with argument -1.

So, if we declared:

extern SignalHandler alt_signal(void);

it means that:

(*alt_signal)();

represents a void value. And therefore:

extern void (*alt_signal(void))(int signum);

is equivalent. Now, signal() is more complex because it not only returns a SignalHandler, it also accepts both an int and a SignalHandler as arguments:

extern void (*signal(int signum, SignalHandler handler))(int signum);

extern void (*signal(int signum, void (*handler)(int signum)))(int signum);

If that still confuses you, I'm not sure how to help - it is still at some levels mysterious to me, but I've grown used to how it works and can therefore tell you that if you stick with it for another 25 years or so, it will become second nature to you (and maybe even a bit quicker if you are clever).

Java SSLException: hostname in certificate didn't match

Thanks Vineet Reynolds. The link you provided held a lot of user comments - one of which I tried in desperation and it helped. I added this method :

// Do not do this in production!!!
HttpsURLConnection.setDefaultHostnameVerifier( new HostnameVerifier(){
    public boolean verify(String string,SSLSession ssls) {
        return true;
    }
});

This seems fine for me now, though I know this solution is temporary. I am working with the network people to identify why my hosts file is being ignored.

Get selected value in dropdown list using JavaScript

Running example of how it works:

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var e = document.getElementById("ddlViewBy");_x000D_
var val1 = e.options[e.selectedIndex].value;_x000D_
var txt = e.options[e.selectedIndex].text;_x000D_
_x000D_
document.write("<br />Selected option Value: "+ val1);_x000D_
document.write("<br />Selected option Text: "+ txt);

_x000D_

<select id="ddlViewBy">_x000D_
  <option value="1">test1</option>_x000D_
  <option value="2">test2</option>_x000D_
  <option value="3"  selected="selected">test3</option>_x000D_
</select>

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Note: The values don't change as the dropdown is changed, if you require that functionality then an onClick change is to be implemented.

What is the best way to return different types of ResponseEntity in Spring MVC or Spring-Boot

Using custom exception class you can return different HTTP status code and dto object.

@PostMapping("/save")
public ResponseEntity<UserDto> saveUser(@RequestBody UserDto userDto) {
    if(userDto.getId() != null) {
        throw new UserNotFoundException("A new user cannot already have an ID");
    }
    return ResponseEntity.ok(userService.saveUser(userDto));
}

Exception class

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "user not found")
public class UserNotFoundException extends RuntimeException {

    public UserNotFoundException(String message) {

        super(message);
    }
}

jQuery position DIV fixed at top on scroll

instead of doing it like that, why not just make the flyout position:fixed, top:0; left:0; once your window has scrolled pass a certain height:

jQuery

  $(window).scroll(function(){
      if ($(this).scrollTop() > 135) {
          $('#task_flyout').addClass('fixed');
      } else {
          $('#task_flyout').removeClass('fixed');
      }
  });

css

.fixed {position:fixed; top:0; left:0;}

Example

Return value in a Bash function

Another way to achive this is name references (requires Bash 4.3+).

function example {
  local -n VAR=$1
  VAR=foo
}

example RESULT
echo $RESULT

Functional, Declarative, and Imperative Programming

imperative and declarative describe two opposing styles of programming. imperative is the traditional "step by step recipe" approach while declarative is more "this is what i want, now you work out how to do it".

these two approaches occur throughout programming - even with the same language and the same program. generally the declarative approach is considered preferable, because it frees the programmer from having to specify so many details, while also having less chance for bugs (if you describe the result you want, and some well-tested automatic process can work backwards from that to define the steps then you might hope that things are more reliable than having to specify each step by hand).

on the other hand, an imperative approach gives you more low level control - it's the "micromanager approach" to programming. and that can allow the programmer to exploit knowledge about the problem to give a more efficient answer. so it's not unusual for some parts of a program to be written in a more declarative style, but for the speed-critical parts to be more imperative.

as you might imagine, the language you use to write a program affects how declarative you can be - a language that has built-in "smarts" for working out what to do given a description of the result is going to allow a much more declarative approach than one where the programmer needs to first add that kind of intelligence with imperative code before being able to build a more declarative layer on top. so, for example, a language like prolog is considered very declarative because it has, built-in, a process that searches for answers.

so far, you'll notice that i haven't mentioned functional programming. that's because it's a term whose meaning isn't immediately related to the other two. at its most simple, functional programming means that you use functions. in particular, that you use a language that supports functions as "first class values" - that means that not only can you write functions, but you can write functions that write functions (that write functions that...), and pass functions to functions. in short - that functions are as flexible and common as things like strings and numbers.

it might seem odd, then, that functional, imperative and declarative are often mentioned together. the reason for this is a consequence of taking the idea of functional programming "to the extreme". a function, in it's purest sense, is something from maths - a kind of "black box" that takes some input and always gives the same output. and that kind of behaviour doesn't require storing changing variables. so if you design a programming language whose aim is to implement a very pure, mathematically influenced idea of functional programming, you end up rejecting, largely, the idea of values that can change (in a certain, limited, technical sense).

and if you do that - if you limit how variables can change - then almost by accident you end up forcing the programmer to write programs that are more declarative, because a large part of imperative programming is describing how variables change, and you can no longer do that! so it turns out that functional programming - particularly, programming in a functional language - tends to give more declarative code.

to summarise, then:

imperative and declarative are two opposing styles of programming (the same names are used for programming languages that encourage those styles)
functional programming is a style of programming where functions become very important and, as a consequence, changing values become less important. the limited ability to specify changes in values forces a more declarative style.

so "functional programming" is often described as "declarative".

React Native: How to select the next TextInput after pressing the "next" keyboard button?

For the accepted solution to work if your TextInput is inside another component, you'll need to "pop" the reference from ref to the parent container.

// MyComponent
render() {
    <View>
        <TextInput ref={(r) => this.props.onRef(r)} { ...this.props }/>
    </View>
}

// MyView
render() {
    <MyComponent onSubmitEditing={(evt) => this.myField2.focus()}/>
    <MyComponent onRef={(r) => this.myField2 = r}/>
}

Common MySQL fields and their appropriate data types

Someone's going to post a much better answer than this, but just wanted to make the point that personally I would never store a phone number in any kind of integer field, mainly because:

You don't need to do any kind of arithmetic with it, and
Sooner or later someone's going to try to (do something like) put brackets around their area code.

In general though, I seem to almost exclusively use:

INT(11) for anything that is either an ID or references another ID
DATETIME for time stamps
VARCHAR(255) for anything guaranteed to be under 255 characters (page titles, names, etc)
TEXT for pretty much everything else.

Of course there are exceptions, but I find that covers most eventualities.

SVN Commit failed, access forbidden

I was unable to commit csharp-files (*.cs). In the end the problem was that at some point i installed mod_mono, which made the *.cs-files inaccessible, through its configuration. So it may well be an apache-configuration issue, if only some sort of files are not accessible.

grep ".cs" /etc/apache2/mods-enabled/*
...
mod_mono_auto.conf:AddType application/x-asp-net .cs
...

Conditional formatting, entire row based

Use RC addressing. So, if I want the background color of Col B to depend upon the value in Col C and apply that from Rows 2 though 20:

Steps:

Select R2C2 to R20C2
Click on Conditional Formatting
Select "Use a formula to determine what cells to format"
Type in the formula: =RC[1] > 25
Create the formatting you want (i.e. background color "yellow")
Applies to: Make sure it says: =R2C2:R20C2

** Note that the "magic" takes place in step 4 ... using RC addressing to look at the value one column to the right of the cell being formatted. In this example, I am checking to see if the value of the cell one column to the right of the cell being formatting contains a value greater than 25 (note that you can put pretty much any formula here that returns a T/F value)

How to display my application's errors in JSF?

FacesContext.addMessage(String, FacesMessage) requires the component's clientId, not it's id. If you're wondering why, think about having a control as a child of a dataTable, stamping out different values with the same control for each row - it would be possible to have a different message printed for each row. The id is always the same; the clientId is unique per row.

So "myform:mybutton" is the correct value, but hard-coding this is ill-advised. A lookup would create less coupling between the view and the business logic and would be an approach that works in more restrictive environments like portlets.

<f:view>
  <h:form>
    <h:commandButton id="mybutton" value="click"
      binding="#{showMessageAction.mybutton}"
      action="#{showMessageAction.validatePassword}" />
    <h:message for="mybutton" />
  </h:form>
</f:view>

Managed bean logic:

/** Must be request scope for binding */
public class ShowMessageAction {

    private UIComponent mybutton;

    private boolean isOK = false;

    public String validatePassword() {
        if (isOK) {
            return "ok";
        }
        else {
            // invalid
            FacesMessage message = new FacesMessage("Invalid password length");
            FacesContext context = FacesContext.getCurrentInstance();
            context.addMessage(mybutton.getClientId(context), message);
        }
        return null;
    }

    public void setMybutton(UIComponent mybutton) {
        this.mybutton = mybutton;
    }

    public UIComponent getMybutton() {
        return mybutton;
    }
}

AngularJS ng-click stopPropagation

In case that you're using a directive like me this is how it works when you need the two data way binding for example after updating an attribute in any model or collection:

angular.module('yourApp').directive('setSurveyInEditionMode', setSurveyInEditionMode)

function setSurveyInEditionMode() {
  return {
    restrict: 'A',
    link: function(scope, element, $attributes) {
      element.on('click', function(event){
        event.stopPropagation();
        // In order to work with stopPropagation and two data way binding
        // if you don't use scope.$apply in my case the model is not updated in the view when I click on the element that has my directive
        scope.$apply(function () {
          scope.mySurvey.inEditionMode = true;
          console.log('inside the directive')
        });
      });
    }
  }
}

Now, you can easily use it in any button, link, div, etc. like so:

<button set-survey-in-edition-mode >Edit survey</button>

how to console.log result of this ajax call?

$.ajax({
    type: 'POST',
    url: 'loginCheck',
    data: $(formLogin).serialize(),    
    success: function(result){
        console.log('my message' + result);
    }
});

JavaScript CSS how to add and remove multiple CSS classes to an element

Try doing this...

document.getElementById("MyElement").className += " MyClass";

Got this here...

Get class name of object as string in Swift

I've been looking for this answer off and on for a while. I use GKStateMachine and like to observe state changes and wanted an easy way to see just the class name. I'm not sure if it's just iOS 10 or Swift 2.3, but in that environment, the following does exactly what I want:

let state:GKState?
print("Class Name: \(String(state.classForCoder)")

// Output:    
// Class Name: GKState

Should we @Override an interface's method implementation?

I believe that javac behaviour has changed - with 1.5 it prohibited the annotation, with 1.6 it doesn't. The annotation provides an extra compile-time check, so if you're using 1.6 I'd go for it.

Center Oversized Image in Div

The width and height are only for example:

parentDiv{
    width: 100px;
    height: 100px;
    position:relative; 
}
innerDiv{
    width: 200px;
    height: 200px;
    position:absolute; 
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

It has to work for you if the left and top of your parent div are not the very top and left of the window of your screen. It works for me.

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

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function realtime() {_x000D_
  _x000D_
  let time = moment().format('h:mm:ss a');_x000D_
  document.getElementById('time').innerHTML = time;_x000D_
  _x000D_
  setInterval(() => {_x000D_
    time = moment().format('h:mm:ss a');_x000D_
    document.getElementById('time').innerHTML = time;_x000D_
  }, 1000)_x000D_
}_x000D_
_x000D_
realtime();

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.1/moment.min.js"></script>_x000D_
_x000D_
<div id="time"></div>

_x000D_

A very simple way using moment.js and setInterval.

setInterval(() => {
  moment().format('h:mm:ss a');
}, 1000)

Sample output

Using setInterval() set to 1000ms or 1 second, the output will refresh every 1 second.

3:25:50 pm

This is how I use this method on one of my side projects.

setInterval(() => {
  this.time = this.shared.time;
}, 1000)

Maybe you're wondering if using setInterval() would cause some performance issues.

Is setInterval CPU intensive?

I don't think setInterval is inherently going to cause you significant performance problems. I suspect the reputation may come from an earlier era, when CPUs were less powerful. ... - lonesomeday

No, setInterval is not CPU intensive in and of itself. If you have a lot of intervals running on very short cycles (or a very complex operation running on a moderately long interval), then that can easily become CPU intensive, depending upon exactly what your intervals are doing and how frequently they are doing it. ... - aroth

But in general, using setInterval really like a lot on your site may slow down things. 20 simultaneously running intervals with more or less heavy work will affect the show. And then again.. you really can mess up any part I guess that is not a problem of setInterval. ... - jAndy

Windows command to convert Unix line endings?

Based on Endoro's answer but to keep the blanks, try this:

@echo off
setlocal enabledelayedexpansion
(for /f "tokens=* delims=:" %%i in ('findstr /n "^" file.unix') do (
        set line=%%i
        set line=!line:*:=!
        echo(!line!
        ))>file.dos

Redirect stdout to a file in Python?

you can try this too much better

import sys

class Logger(object):
    def __init__(self, filename="Default.log"):
        self.terminal = sys.stdout
        self.log = open(filename, "a")

    def write(self, message):
        self.terminal.write(message)
        self.log.write(message)

sys.stdout = Logger("yourlogfilename.txt")
print "Hello world !" # this is should be saved in yourlogfilename.txt

Converting a float to a string without rounding it

I know this is too late but for those who are coming here for the first time, I'd like to post a solution. I have a float value index and a string imgfile and I had the same problem as you. This is how I fixed the issue

index = 1.0
imgfile = 'data/2.jpg'
out = '%.1f,%s' % (index,imgfile)
print out

The output is

1.0,data/2.jpg

You may modify this formatting example as per your convenience.

How do I align views at the bottom of the screen?

This also works.

<LinearLayout 
    android:id="@+id/linearLayout4"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_below="@+id/linearLayout3"
    android:layout_centerHorizontal="true"
    android:orientation="horizontal" 
    android:gravity="bottom"
    android:layout_alignParentBottom="true"
    android:layout_marginTop="20dp"
>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" 

    />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" 


    />

</LinearLayout>

gravity="bottom" to float LinearLayout elements to bottom

Get string between two strings in a string

I used the code snippet from Vijay Singh Rana which basically does the job. But it causes problems if the firstString does already contain the lastString. What I wanted was extracting a access_token from a JSON Response (no JSON Parser loaded). My firstString was \"access_token\": \" and my lastString was \". I ended up with a little modification

string Between(string str, string firstString, string lastString)
{    
    int pos1 = str.IndexOf(firstString) + firstString.Length;
    int pos2 = str.Substring(pos1).IndexOf(lastString);
    return str.Substring(pos1, pos2);
}

Difference between innerText, innerHTML and value?

to add to the list, innerText will keep your text-transform, innerHTML wont

Disable resizing of a Windows Forms form

Another way is to change properties "AutoSize" (set to True) and "AutosizeMode" (set to GrowAndShrink).

This has the effect of the form autosizing to the elements on it and never allowing the user to change its size.

openssl s_client using a proxy

Officially not.

But here's a patch: http://rt.openssl.org/Ticket/Display.html?id=2651&user=guest&pass=guest

Convert timestamp to date in Oracle SQL

Format like this while selecting:

to_char(systimestamp, 'DD-MON-YYYY')

Eg:

select to_char(systimestamp, 'DD-MON-YYYY') from dual;

How to replace NaNs by preceding values in pandas DataFrame?

Just agreeing with ffill method, but one extra info is that you can limit the forward fill with keyword argument limit.

>>> import pandas as pd    
>>> df = pd.DataFrame([[1, 2, 3], [None, None, 6], [None, None, 9]])

>>> df
     0    1   2
0  1.0  2.0   3
1  NaN  NaN   6
2  NaN  NaN   9

>>> df[1].fillna(method='ffill', inplace=True)
>>> df
     0    1    2
0  1.0  2.0    3
1  NaN  2.0    6
2  NaN  2.0    9

Now with limit keyword argument

>>> df[0].fillna(method='ffill', limit=1, inplace=True)

>>> df
     0    1  2
0  1.0  2.0  3
1  1.0  2.0  6
2  NaN  2.0  9

If hasClass then addClass to parent

You probably want to change the condition to if ($(this).hasClass('active'))

Also, hasClass and addClass take classnames, not selectors.
Therefore, you shouldn't include a ..

What is difference between functional and imperative programming languages?

Functional Programming is a form of declarative programming, which describe the logic of computation and the order of execution is completely de-emphasized.

Problem: I want to change this creature from a horse to a giraffe.

Lengthen neck
Lengthen legs
Apply spots
Give the creature a black tongue
Remove horse tail

Each item can be run in any order to produce the same result.

Imperative Programming is procedural. State and order is important.

Problem: I want to park my car.

Note the initial state of the garage door
Stop car in driveway
If the garage door is closed, open garage door, remember new state; otherwise continue
Pull car into garage
Close garage door

Each step must be done in order to arrive at desired result. Pulling into the garage while the garage door is closed would result in a broken garage door.

Uploading an Excel sheet and importing the data into SQL Server database

    public async Task<HttpResponseMessage> PostFormDataAsync()    //async is used for defining an asynchronous method
    {
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
        }
        var fileLocation = "";
        string root = HttpContext.Current.Server.MapPath("~/App_Data");
        MultipartFormDataStreamProvider provider = new MultipartFormDataStreamProvider(root);  //Helps in HTML file uploads to write data to File Stream
        try
        {
            // Read the form data.
        await Request.Content.ReadAsMultipartAsync(provider);

            // This illustrates how to get the file names.
            foreach (MultipartFileData file in provider.FileData)
            {
                Trace.WriteLine(file.Headers.ContentDisposition.FileName); //Gets the file name
                var filePath = file.Headers.ContentDisposition.FileName.Substring(1, file.Headers.ContentDisposition.FileName.Length - 2); //File name without the path
                File.Copy(file.LocalFileName, file.LocalFileName + filePath); //Save a copy for reading it
                fileLocation = file.LocalFileName + filePath; //Complete file location
            }
    HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, recordStatus);
            return response;
}
catch (System.Exception e)
    {
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
    }
}
public void ReadFromExcel()
{
try
        {
            DataTable sheet1 = new DataTable();
            OleDbConnectionStringBuilder csbuilder = new OleDbConnectionStringBuilder();
            csbuilder.Provider = "Microsoft.ACE.OLEDB.12.0";
            csbuilder.DataSource = fileLocation;
            csbuilder.Add("Extended Properties", "Excel 12.0 Xml;HDR=YES");
            string selectSql = @"SELECT * FROM [Sheet1$]";
            using (OleDbConnection connection = new OleDbConnection(csbuilder.ConnectionString))
            using (OleDbDataAdapter adapter = new OleDbDataAdapter(selectSql, connection))
            {
                connection.Open();
                adapter.Fill(sheet1);
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }          
}

Convert digits into words with JavaScript

Another conversion that uses remainders and supports different languages:

function numberToWords(number) {
  var result = [];

  var fraction = number.toFixed(2).split('.');
  var integer_part = parseInt(fraction[0]);
  // var fractional_part = parseInt(fraction[1]); -- not handled here

  var previousNumber = null;
  for (var i = 0; i < fraction[0].length; i++) {
    var reminder = Math.floor(integer_part % 10);
    integer_part /= 10;
    var name = getNumberName(reminder, i, fraction[0].length, previousNumber);
    previousNumber = reminder;
    if (name)
      result.push(name);
  }

  result.reverse();
  return result.join(' ');
}

The getNumberName function is language-dependent and handles numbers up to 9999 (but it is easy to extend it to handle larger numbers):

function getNumberName(number, power, places, previousNumber) {
  var result = "";
  if (power == 1) {
    result = handleTeensAndTys(number, previousNumber);
  } else if (power == 0 && places != 1 || number == 0) {
    // skip number that was handled in teens and zero
  } else {
    result = locale.numberNames[number.toString()] + locale.powerNames[power.toString()];
  }

  return result;
}

handleTeensAndTys handles multiples of ten:

function handleTeensAndTys(number, previousNumber) {
  var result = "";
  if (number == 1) { // teens
    if (previousNumber in locale.specialTeenNames) {
      result = locale.specialTeenNames[previousNumber];    
    } else if (previousNumber in locale.specialTyNames) {
      result = locale.specialTyNames[previousNumber] + locale.teenSuffix;
    } else {
      result = locale.numberNames[previousNumber] + locale.teenSuffix;    
    }
  } else if (number == 0) { // previousNumber was not handled in teens
    result = locale.numberNames[previousNumber.toString()];
  } else { // other tys
    if (number in locale.specialTyNames) {
      result = locale.specialTyNames[number];
    } else {
      result = locale.numberNames[number];
    }
    result += locale.powerNames[1];
    if (previousNumber != 0) {
      result += " " + locale.numberNames[previousNumber.toString()];
    }
  }
  return result;
}

Finally, locale examples:

var locale = { // English
  numberNames: {1: "one", 2: "two", 3: "three", 4: "four", 5: "five", 6: "six", 7: "seven", 8: "eight", 9: "nine" },
  powerNames: {0: "", 1: "ty", 2: " hundred", 3: " thousand" },
  specialTeenNames: {0: "ten", 1: "eleven", 2: "twelve" },
  specialTyNames: {2: "twen", 3: "thir", 5: "fif" },
  teenSuffix: "teen"
};

var locale = { // Estonian
  numberNames: {1: "üks", 2: "kaks", 3: "kolm", 4: "neli", 5: "viis", 6: "kuus", 7: "seitse", 8: "kaheksa", 9: "üheksa"},
  powerNames: {0: "", 1: "kümmend", 2: "sada", 3: " tuhat" },
  specialTeenNames: {0: "kümme"},
  specialTyNames: {},
  teenSuffix: "teist"
};

Here's a JSFiddle with tests: https://jsfiddle.net/rcrxna7v/15/

Validate that text field is numeric usiung jQuery

I know there isn't any need to add a plugin for this.

But this can be useful if you are doing so many things with numbers. So checkout this plugin at least for a knowledge point of view.

The rest of karim79's answer is super cool.

<!DOCTYPE html>
<html>
    <head>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
        <script type="text/javascript" src="jquery.numeric.js"></script>
    </head>

    <body>
        <form>
            Numbers only:
            <input class="numeric" type="text" />
            Integers only:
            <input class="integer" type="text" />
            No negative values:
            <input class="positive" type="text" />
            No negative values (integer only):
            <input class="positive-integer" type="text" />
            <a href="#" id="remove">Remove numeric</a>
        </form>

        <script type="text/javascript">
            $(".numeric").numeric();

            $(".integer").numeric(false, function() {
                alert("Integers only");
                this.value = "";
                this.focus();
            });

            $(".positive").numeric({ negative: false },
                function() {
                    alert("No negative values");
                    this.value = "";
                    this.focus();
                });

            $(".positive-integer").numeric({ decimal: false, negative: false },
                function() {
                    alert("Positive integers only");
                    this.value = "";
                    this.focus();
                });

            $("#remove").click(
                function(e)
                {
                    e.preventDefault();
                    $(".numeric,.integer,.positive").removeNumeric();
                }
            );
        </script>

    </body>
</html>

How do I register a .NET DLL file in the GAC?

Just drag and drop the DLL file into folder C:\Windows\assembly using Windows Explorer.

Caveat:

In earlier versions of the .NET Framework, the Shfusion.dll Windows shell extension let you install assemblies by dragging them to File Explorer. Beginning with .NET Framework 4, Shfusion.dll is obsolete.

Source: How to: Install an assembly into the global assembly cache

Format a number as 2.5K if a thousand or more, otherwise 900

How can I force clients to refresh JavaScript files?

As far as I know a common solution is to add a ?<version> to the script's src link.

For instance:

<script type="text/javascript" src="myfile.js?1500"></script>

I assume at this point that there isn't a better way than find-replace to increment these "version numbers" in all of the script tags?

You might have a version control system do that for you? Most version control systems have a way to automatically inject the revision number on check-in for instance.

It would look something like this:

<script type="text/javascript" src="myfile.js?$$REVISION$$"></script>

Of course, there are always better solutions like this one.

CSS pseudo elements in React

Got a reply from @Vjeux over at the React team:

Normal HTML/CSS:

<div class="something"><span>Something</span></div>
<style>
    .something::after {
    content: '';
    position: absolute;
    -webkit-filter: blur(10px) saturate(2);
}
</style>

React with inline style:

render: function() {
    return (
        <div>
          <span>Something</span>
          <div style={{position: 'absolute', WebkitFilter: 'blur(10px) saturate(2)'}} />
        </div>
    );
},

The trick is that instead of using ::after in CSS in order to create a new element, you should instead create a new element via React. If you don't want to have to add this element everywhere, then make a component that does it for you.

For special attributes like -webkit-filter, the way to encode them is by removing dashes - and capitalizing the next letter. So it turns into WebkitFilter. Note that doing {'-webkit-filter': ...} should also work.

How to get current local date and time in Kotlin

I use this to fetch data from API every 20 seconds

 private fun isFetchNeeded(savedAt: Long): Boolean {
        return savedAt + 20000 < System.currentTimeMillis()
    }

If strings starts with in PowerShell

$Group is an object, but you will actually need to check if $Group.samaccountname.StartsWith("string").

Change $Group.StartsWith("S_G_") to $Group.samaccountname.StartsWith("S_G_").

How to check for palindrome using Python logic

print ["Not a palindrome","Is a palindrome"][s == ''.join([s[len(s)-i-1] for i in range(len(s))])]

This is the typical way of writing single line code

How to create bitmap from byte array?

Guys thank you for your help. I think all of this answers works. However i think my byte array contains raw bytes. That's why all of those solutions didnt work for my code.

However i found a solution. Maybe this solution helps other coders who have problem like mine.

static byte[] PadLines(byte[] bytes, int rows, int columns) {
   int currentStride = columns; // 3
   int newStride = columns;  // 4
   byte[] newBytes = new byte[newStride * rows];
   for (int i = 0; i < rows; i++)
       Buffer.BlockCopy(bytes, currentStride * i, newBytes, newStride * i, currentStride);
   return newBytes;
 }

 int columns = imageWidth;
 int rows = imageHeight;
 int stride = columns;
 byte[] newbytes = PadLines(imageData, rows, columns);

 Bitmap im = new Bitmap(columns, rows, stride, 
          PixelFormat.Format8bppIndexed, 
          Marshal.UnsafeAddrOfPinnedArrayElement(newbytes, 0));

 im.Save("C:\\Users\\musa\\Documents\\Hobby\\image21.bmp");

This solutions works for 8bit 256 bpp (Format8bppIndexed). If your image has another format you should change PixelFormat .

And there is a problem with colors right now. As soon as i solved this one i will edit my answer for other users.

*PS = I am not sure about stride value but for 8bit it should be equal to columns.

And also this function Works for me.. This function copies 8 bit greyscale image into a 32bit layout.

public void SaveBitmap(string fileName, int width, int height, byte[] imageData)
        {

            byte[] data = new byte[width * height * 4];

            int o = 0;

            for (int i = 0; i < width * height; i++)
            {
                byte value = imageData[i];


                data[o++] = value;
                data[o++] = value;
                data[o++] = value;
                data[o++] = 0; 
            }

            unsafe
            {
                fixed (byte* ptr = data)
                {

                    using (Bitmap image = new Bitmap(width, height, width * 4,
                                PixelFormat.Format32bppRgb, new IntPtr(ptr)))
                    {

                        image.Save(Path.ChangeExtension(fileName, ".jpg"));
                    }
                }
            }
        }

Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)

I had to #include <tchar.h> in my windows service application. I left it as a windows console type subsystem. The "Character Set" was set to UNICODE.

How to remove new line characters from a string?

You can use Trim if you want to remove from start and end.

string stringWithoutNewLine = "\n\nHello\n\n".Trim();

How can compare-and-swap be used for a wait-free mutual exclusion for any shared data structure?

The linked list holds operations on the shared data structure.

For example, if I have a stack, it will be manipulated with pushes and pops. The linked list would be a set of pushes and pops on the pseudo-shared stack. Each thread sharing that stack will actually have a local copy, and to get to the current shared state, it'll walk the linked list of operations, and apply each operation in order to its local copy of the stack. When it reaches the end of the linked list, its local copy holds the current state (though, of course, it's subject to becoming stale at any time).

In the traditional model, you'd have some sort of locks around each push and pop. Each thread would wait to obtain a lock, then do a push or pop, then release the lock.

In this model, each thread has a local snapshot of the stack, which it keeps synchronized with other threads' view of the stack by applying the operations in the linked list. When it wants to manipulate the stack, it doesn't try to manipulate it directly at all. Instead, it simply adds its push or pop operation to the linked list, so all the other threads can/will see that operation and they can all stay in sync. Then, of course, it applies the operations in the linked list, and when (for example) there's a pop it checks which thread asked for the pop. It uses the popped item if and only if it's the thread that requested this particular pop.

Location of WSDL.exe

You can find what you want in windows by looking with the windows dir command, use the administrator account to make it easy:

c:>dir wsdl.exe /s

How to validate IP address in Python?

I think this would do it...

def validIP(address):
    parts = address.split(".")
    if len(parts) != 4:
        return False
    for item in parts:
        if not 0 <= int(item) <= 255:
            return False
    return True

How do you remove all the options of a select box and then add one option and select it with jQuery?

If your goal is to remove all the options from the select except the first one (typically the 'Please pick an item' option) you could use:

$('#mySelect').find('option:not(:first)').remove();

unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING error

Change your code to.

<?php
$sqlupdate1 = "UPDATE table SET commodity_quantity=".$qty."WHERE user=".$rows['user'];
?>

There was syntax error in your query.

Return outside function error in Python

You are not writing your code inside any function, you can return from functions only. Remove return statement and just print the value you want.

Laravel Mail::send() sending to multiple to or bcc addresses

If you want to send emails simultaneously to all the admins, you can do something like this:

In your .env file add all the emails as comma separated values:

[email protected],[email protected],[email protected]

so when you going to send the email just do this (yes! the 'to' method of message builder instance accepts an array):

So,

$to = explode(',', env('ADMIN_EMAILS'));

and...

$message->to($to);

will now send the mail to all the admins.

Retrieving a List from a java.util.stream.Stream in Java 8

collect(Collectors.toList());

This is the call which you can use to convert any Stream to List.

more concretely:

    List<String> myList = stream.collect(Collectors.toList());

from:

https://www.geeksforgeeks.org/collectors-tolist-method-in-java-with-examples/

Node.js project naming conventions for files & folders

There are no conventions. There are some logical structure.

The only one thing that I can say: Never use camelCase file and directory names. Why? It works but on Mac and Windows there are no different between someAction and some action. I met this problem, and not once. I require'd a file like this:

var isHidden = require('./lib/isHidden');

But sadly I created a file with full of lowercase: lib/ishidden.js. It worked for me on mac. It worked fine on mac of my co-worker. Tests run without errors. After deploy we got a huge error:

Error: Cannot find module './lib/isHidden'

Oh yeah. It's a linux box. So camelCase directory structure could be dangerous. It's enough for a colleague who is developing on Windows or Mac.

So use underscore (_) or dash (-) separator if you need.

How do I solve the "server DNS address could not be found" error on Windows 10?

Steps to manually configure DNS:

You can access Network and Sharing center by right clicking on the Network icon on the taskbar.
Now choose adapter settings from the side menu.
This will give you a list of the available network adapters in the system . From them right click on the adapter you are using to connect to the internet now and choose properties option.
In the networking tab choose ‘Internet Protocol Version 4 (TCP/IPv4)’.
Now you can see the properties dialogue box showing the properties of IPV4. Here you need to change some properties.

Select ‘use the following DNS address’ option. Now fill the following fields as given here.

Preferred DNS server: 208.67.222.222

Alternate DNS server : 208.67.220.220

This is an available Open DNS address. You may also use google DNS server addresses.

After filling these fields. Check the ‘validate settings upon exit’ option. Now click OK.

You have to add this DNS server address in the router configuration also (by referring the router manual for more information).

Refer : for above method & alternative

If none of this works, then open command prompt(Run as Administrator) and run these:

ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
NETSH winsock reset catalog
NETSH int ipv4 reset reset.log
NETSH int ipv6 reset reset.log
Exit

Hopefully that fixes it, if its still not fixed there is a chance that its a NIC related issue(driver update or h/w).

Also FYI, this has a thread on Microsoft community : Windows 10 - DNS Issue

What is the best way to extract the first word from a string in Java?

You should be doing this

String input = "hello world, this is a line of text";

int i = input.indexOf(' ');
String word = input.substring(0, i);
String rest = input.substring(i);

The above is the fastest way of doing this task.

Check whether an array is empty

There are two elements in array and this definitely doesn't mean that array is empty. As a quick workaround you can do following:

$errors = array_filter($errors);

if (!empty($errors)) {
}

array_filter() function's default behavior will remove all values from array which are equal to null, 0, '' or false.

Otherwise in your particular case empty() construct will always return true if there is at least one element even with "empty" value.

'was not declared in this scope' error

#include <iostream>
using namespace std;
class matrix
{
    int a[10][10],b[10][10],c[10][10],x,y,i,j;
    public :
        void degerler();
        void ters();
};
void matrix::degerler()
{
    cout << "Satirlari giriniz: "; cin >> x;
    cout << "Sütunlari giriniz: "; cin >> y;
    cout << "Ilk matris elamanlarini giriniz:\n\n";
    for (i=1; i<=x; i++)
    {
        for (j=1; j<=y; j++)
        {
            cin >> a[i][j];
        }
    }
    cout << "Ikinci matris elamanlarini giriniz:\n\n";
    for (i=1; i<=x; i++)
    {
        for (j=1; j<=y; j++)
        {
            cin >> b[i][j];
        }
    }
}

void matrix::ters()
{
    cout << "matrisin tersi\n";
    for (i=1; i<=x; i++)
    {
        for (j=1; j<=y; j++)
        {
    if(i==j)
    {
    b[i][j]=1;
    }
    else
    b[i][j]=0;
    }
}
float d,k;
    for (i=1; i<=x; i++)
    {
    d=a[i][j];
        for (j=1; j<=y; j++)
        {
    a[i][j]=a[i][j]/d;
            b[i][j]=b[i][j]/d;
    }
        for (int h=0; h<x; h++)
        {
            if(h!=i)
    {
       k=a[h][j];
               for (j=1; j<=y; j++)
               {
                    a[h][j]=a[h][j]-(a[i][j]*k);
                    b[h][j]=b[h][j]-(b[i][j]*k);
               }
    }
    count << a[i][j] << "";
    }
    count << endl;
}  
}
int main()
{
    int secim;
    char ch;    
    matrix m;
    m.degerler();
    do
     {
    cout << "seçiminizi giriniz\n";
    cout << " 1. matrisin tersi\n";
    cin >> secim;
    switch (secim)
    {
        case 1:
            m.ters();
            break;
    }
    cout << "\nBaska bir sey yap/n?";
    cin >> ch;
    }
    while (ch!= 'n');
    cout << "\n";
    return 0;
}

How to configure SSL certificates with Charles Web Proxy and the latest Android Emulator on Windows?

For what it's worth here are the step by step instructions for doing this in an Android device. Should be the same for iOS:

Open Charles
Go to Proxy > Proxy Settings > SSL
Check “Enable SSL Proxying”
Select “Add location” and enter the host name and port (if needed)
Click ok and make sure the option is checked
Download the Charles cert from here: Charles cert >
Send that file to yourself in an email.
Open the email on your device and select the cert
In “Name the certificate” enter whatever you want
Click OK and you should get a message that the certificate was installed

You should then be able to see the SSL files in Charles. If you want to intercept and change the values you can use the "Map Local" tool which is really awesome:

In Charles go to Tools > Map Local
Select "Add entry"
Enter the values for the file you want to replace
In “Local path” select the file you want the app to load instead
Click OK
Make sure the entry is selected and click OK
Run your app
You should see in “Notes” that your file loads instead of the live one

How to get Activity's content view?

You can get the view Back if you put an ID to your Layout.

<RelativeLayout
    android:id="@+id/my_relative_layout_id"

And call it from findViewById ...

C# Call a method in a new thread

If you actually start a new thread, that thread will terminate when the method finishes:

Thread thread = new Thread(SecondFoo);
thread.Start();

Now SecondFoo will be called in the new thread, and the thread will terminate when it completes.

Did you actually mean that you wanted the thread to terminate when the method in the calling thread completes?

EDIT: Note that starting a thread is a reasonably expensive operation. Do you definitely need a brand new thread rather than using a threadpool thread? Consider using ThreadPool.QueueUserWorkItem or (preferrably, if you're using .NET 4) TaskFactory.StartNew.

Which JDK version (Language Level) is required for Android Studio?

Answer Clarification - Android Studio supports JDK8

The following is an answer to the question "What version of Java does Android support?" which is different from "What version of Java can I use to run Android Studio?" which is I believe what was actually being asked. For those looking to answer the 2nd question, you might find Using Android Studio with Java 1.7 helpful.

Also: See http://developer.android.com/sdk/index.html#latest for Android Studio system requirements. JDK8 is actually a requirement for PC and linux (as of 5/14/16).

Java 8 update (3/19/14)

Because I'd assume this question will start popping up soon with the release yesterday: As of right now, there's no set date for when Android will support Java 8.

Here's a discussion over at /androiddev - http://www.reddit.com/r/androiddev/comments/22mh0r/does_android_have_any_plans_for_java_8/

If you really want lambda support, you can checkout Retrolambda - https://github.com/evant/gradle-retrolambda. I've never used it, but it seems fairly promising.

Another Update: Android added Java 7 support

Android now supports Java 7 (minus try-with-resource feature). You can read more about the Java 7 features here: https://stackoverflow.com/a/13550632/413254. If you're using gradle, you can add the following in your build.gradle:

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}

Older response

I'm using Java 7 with Android Studio without any problems (OS X - 10.8.4). You need to make sure you drop the project language level down to 6.0 though. See the screenshot below.

enter image description here

What tehawtness said below makes sense, too. If they're suggesting JDK 6, it makes sense to just go with JDK 6. Either way will be fine.

enter image description here

Update: See this SO post -- https://stackoverflow.com/a/9567402/413254

Remove all special characters from a string in R?

Convert the Special characters to apostrophe,

Data  <- gsub("[^0-9A-Za-z///' ]","'" , Data ,ignore.case = TRUE)

Below code it to remove extra ''' apostrophe

Data <- gsub("''","" , Data ,ignore.case = TRUE)

Use gsub(..) function for replacing the special character with apostrophe

HAProxy redirecting http to https (ssl)

According to http://parsnips.net/haproxy-http-to-https-redirect/ it should be as easy as configuring your haproxy.cfg to contain the follow.

#---------------------------------------------------------------------
# Redirect to secured
#---------------------------------------------------------------------
frontend unsecured *:80
    redirect location https://foo.bar.com

#---------------------------------------------------------------------
# frontend secured
#---------------------------------------------------------------------
frontend  secured *:443
   mode  tcp
   default_backend      app

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
    mode  tcp
    balance roundrobin
    server  app1 127.0.0.1:5001 check
    server  app2 127.0.0.1:5002 check
    server  app3 127.0.0.1:5003 check
    server  app4 127.0.0.1:5004 check

Select DISTINCT individual columns in django?

User order by with that field, and then do distinct.

ProductOrder.objects.order_by('category').values_list('category', flat=True).distinct()

Scripting SQL Server permissions

You can get SQL Server Management Studio to do it for you:

Right click the database you want to export permissions for
Select 'Tasks' then 'Generate Scripts...'
Confirm the database you're scripting
Set the following scripting options:
- Script Create: FALSE
- Script Object-Level Permissions: TRUE
Select the object types whose permission you want to script
Select the objects whose permission you want to script
Select where you want the script produced

This will produce a script to set permissions for all selected objects but suppresses the object scripts themselves.

This is based on the dialog for MS SQL 2008 with all other scripting options unchanged from install defaults.

Change the Theme in Jupyter Notebook?

To install the Jupyterthemes package directly with conda, use:

conda install -c conda-forge jupyterthemes

Then, as others have pointed out, change the theme with jt -t <theme-name>

How can I replace every occurrence of a String in a file with PowerShell?

Small correction for the Set-Content command. If the searched string is not found the Set-Content command will blank (empty) the target file.

You can first verify if the string you are looking for exist or not. If not it will not replace anything.

If (select-string -path "c:\Windows\System32\drivers\etc\hosts" -pattern "String to look for") `
    {(Get-Content c:\Windows\System32\drivers\etc\hosts).replace('String to look for', 'String to replace with') | Set-Content c:\Windows\System32\drivers\etc\hosts}
    Else{"Nothing happened"}

Drag and drop a DLL to the GAC ("assembly") in windows server 2008 .net 4.0

Keep in mind that the Fusion API is unmanaged. The current reference for it is here: Development Guide > Unmanaged API Reference > Fusion

However, there is a managed method to add an assembly to GAC: System.EnterpriseServices.Internal.Publish.GacInstall And, if you need to register any Types: System.EnterpriseServices.Internal.Publish.RegisterAssembly

The reference for the publish class is here: .NET Framework Class Library > System.EnterpriseServices Namespaces > System.EnterpriseServices.Internal

However, these methods were designed for installing components that are required by a web service application such as ASP.NET or WCF. As a result they don't register the assemblies with Fusion; thus, they can be uninstalled by other applications, or using gacutil and cause your assembly to stop working. So, if you use them outside of a web server where an administrator is managing the GAC then be sure to add a reference to your application in SOFTWARE\Wow6432Node\Microsoft\Fusion\References (for 64-bit OS) or SOFTWARE\Microsoft\Fusion\References (for 32-bit OS) so that nobody can remove your support assemblies unless they uninstall your application.

how to find host name from IP with out login to the host

For Windows, try:

NBTSTAT -A 10.100.3.104

ping -a 10.100.3.104

For Linux, try:
```
nmblookup -A 10.100.3.104
```

They are almost same.

ORACLE and TRIGGERS (inserted, updated, deleted)

I've changed my code like this and it works:

CREATE or REPLACE TRIGGER test001
  AFTER INSERT OR UPDATE OR DELETE ON tabletest001
  REFERENCING OLD AS old_buffer NEW AS new_buffer 
  FOR EACH ROW WHEN (new_buffer.field1 = 'HBP00' OR old_buffer.field1 = 'HBP00') 

DECLARE
      Operation       NUMBER;
      CustomerCode    CHAR(10 BYTE);
BEGIN

IF DELETING THEN 
  Operation := 3;
  CustomerCode := :old_buffer.field1;
END IF;

IF INSERTING THEN 
  Operation := 1;
  CustomerCode := :new_buffer.field1;
END IF;

IF UPDATING THEN 
  Operation := 2;
  CustomerCode := :new_buffer.field1;
END IF;    

// DO SOMETHING ...

EXCEPTION
    WHEN OTHERS THEN ErrorCode := SQLCODE;

END;

How to frame two for loops in list comprehension python

The appropriate LC would be

[entry for tag in tags for entry in entries if tag in entry]

The order of the loops in the LC is similar to the ones in nested loops, the if statements go to the end and the conditional expressions go in the beginning, something like

[a if a else b for a in sequence]

See the Demo -

>>> tags = [u'man', u'you', u'are', u'awesome']
>>> entries = [[u'man', u'thats'],[ u'right',u'awesome']]
>>> [entry for tag in tags for entry in entries if tag in entry]
[[u'man', u'thats'], [u'right', u'awesome']]
>>> result = []
    for tag in tags:
        for entry in entries:
            if tag in entry:
                result.append(entry)


>>> result
[[u'man', u'thats'], [u'right', u'awesome']]

EDIT - Since, you need the result to be flattened, you could use a similar list comprehension and then flatten the results.

>>> result = [entry for tag in tags for entry in entries if tag in entry]
>>> from itertools import chain
>>> list(chain.from_iterable(result))
[u'man', u'thats', u'right', u'awesome']

Adding this together, you could just do

>>> list(chain.from_iterable(entry for tag in tags for entry in entries if tag in entry))
[u'man', u'thats', u'right', u'awesome']

You use a generator expression here instead of a list comprehension. (Perfectly matches the 79 character limit too (without the list call))

Could not find main class HelloWorld

You either want to add "." to your CLASSPATH to specify the current directory, or add it manually at run time the way unbeli suggested.

When to favor ng-if vs. ng-show/ng-hide?

From my experience:

1) If your page has a toggle that uses ng-if/ng-show to show/hide something, ng-if causes more of a browser delay (slower). For example: if you have a button used to toggle between two views, ng-show seems to be faster.

2) ng-if will create/destroy scope when it evaluates to true/false. If you have a controller attached to the ng-if, that controller code will get executed every time the ng-if evaluates to true. If you are using ng-show, the controller code only gets executed once. So if you have a button that toggles between multiple views, using ng-if and ng-show would make a huge difference in how you write your controller code.

How can I convert a string to a number in Perl?

This is a simple solution:

Example 1

my $var1 = "123abc";
print $var1 + 0;

Result

Example 2

my $var2 = "abc123";
print $var2 + 0;

Result

SQL, Postgres OIDs, What are they and why are they useful?

OIDs basically give you a built-in id for every row, contained in a system column (as opposed to a user-space column). That's handy for tables where you don't have a primary key, have duplicate rows, etc. For example, if you have a table with two identical rows, and you want to delete the oldest of the two, you could do that using the oid column.

OIDs are implemented using 4-byte unsigned integers. They are not unique–OID counter will wrap around at 2³²-1. OID are also used to identify data types (see /usr/include/postgresql/server/catalog/pg_type_d.h).

In my experience, the feature is generally unused in most postgres-backed applications (probably in part because they're non-standard), and their use is essentially deprecated:

In PostgreSQL 8.1 default_with_oids is off by default; in prior versions of PostgreSQL, it was on by default.

The use of OIDs in user tables is considered deprecated, so most installations should leave this variable disabled. Applications that require OIDs for a particular table should specify WITH OIDS when creating the table. This variable can be enabled for compatibility with old applications that do not follow this behavior.

KERNELBASE.dll Exception 0xe0434352 offset 0x000000000000a49d

0xe0434352 is the SEH code for a CLR exception. If you don't understand what that means, stop and read A Crash Course on the Depths of Win32™ Structured Exception Handling. So your process is not handling a CLR exception. Don't shoot the messenger, KERNELBASE.DLL is just the unfortunate victim. The perpetrator is MyApp.exe.

There should be a minidump of the crash in DrWatson folders with a full stack, it will contain everything you need to root cause the issue.

I suggest you wire up, in your myapp.exe code, AppDomain.UnhandledException and Application.ThreadException, as appropriate.

How do I trim() a string in angularjs?

JS .trim() is supported in basically everthing, except IE 8 and below.

If you want it to work with that, then, you can use JQuery, but it'll need to be <2.0.0 (as they removed support for IE8 in the 2.x.x line).

Your other option, if you care about IE7/8 (As you mention earlier), is to add trim yourself:

if(typeof String.prototype.trim !== 'function') {
  String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g, ''); 
  }
}

Validate fields after user has left a field

You can dynamically set the has-error css class (assuming you're using bootstrap) using ng-class and a property on the scope of the associated controller:

plunkr: http://plnkr.co/edit/HYDlaTNThZE02VqXrUCH?p=info

HTML:

<div ng-class="{'has-error': badEmailAddress}">
    <input type="email" class="form-control" id="email" name="email"
        ng-model="email" 
        ng-blur="emailBlurred(email.$valid)">
</div>

Controller:

$scope.badEmailAddress = false;

$scope.emailBlurred = function (isValid) {
    $scope.badEmailAddress = !isValid;
};

jQuery: how to scroll to certain anchor/div on page load?

Have a look at this

Appending the #value into the address is default behaviour that browsers such as IE use to identify named anchor positions on the page, seeing this comes from Netscape.

You can intercept it and remove it, read this article.

Getting file size in Python?

You may use os.stat() function, which is a wrapper of system call stat():

import os

def getSize(filename):
    st = os.stat(filename)
    return st.st_size

When to use If-else if-else over switch statements and vice versa

This depends very much on the specific case. Preferably, I think one should use the switch over the if-else if there are many nested if-elses.

The question is how much is many?

Yesterday I was asking myself the same question:

public enum ProgramType {
    NEW, OLD
}

if (progType == OLD) {
    // ...
} else if (progType == NEW) {
    // ...
}

if (progType == OLD) {
    // ...
} else {
    // ...
}

switch (progType) {
case OLD:
    // ...
    break;
case NEW:
    // ...
    break;
default:
    break;
}

In this case, the 1st if has an unnecessary second test. The 2nd feels a little bad because it hides the NEW.

I ended up choosing the switch because it just reads better.

I am getting "java.lang.ClassNotFoundException: com.google.gson.Gson" error even though it is defined in my classpath

Well for me the problem got resolved by adding the jars in my APACHE/TOMCAT/lib folder ! .

sh: react-scripts: command not found after running npm start

This boggles me time to time when I have a fresh start with create-react-app, please make sure your NODE_ENV variable is set to development not production, as devDependencies in your package.json will not be installed by npm install.

Is there a method for String conversion to Title Case?

Here's another take based on @dfa's and @scottb's answers that handles any non-letter/digit characters:

public final class TitleCase {

    public static String toTitleCase(String input) {

        StringBuilder titleCase = new StringBuilder(input.length());
        boolean nextTitleCase = true;

        for (char c : input.toLowerCase().toCharArray()) {
            if (!Character.isLetterOrDigit(c)) {
                nextTitleCase = true;
            } else if (nextTitleCase) {
                c = Character.toTitleCase(c);
                nextTitleCase = false;
            }
            titleCase.append(c);
        }

        return titleCase.toString();
    }

}

Given input:

MARY ÄNN O’CONNEŽ-ŠUSLIK

the output is

Mary Änn O’Connež-Šuslik

Styling input buttons for iPad and iPhone

I had the same issue today using primefaces (primeng) and angular 7. Add the following to your style.css

p-button {
   -webkit-appearance: none !important;
}

i am also using a bit of bootstrap which has a reboot.css, that overrides it with (thats why i had to add !important)

button {
  -webkit-appearance: button;

}

Two values from one input in python?

The Python way to map

printf("Enter two numbers here: ");
scanf("%d %d", &var1, &var2)

would be

var1, var2 = raw_input("Enter two numbers here: ").split()

Note that we don't have to explicitly specify split(' ') because split() uses any whitespace characters as delimiter as default. That means if we simply called split() then the user could have separated the numbers using tabs, if he really wanted, and also spaces.,

Python has dynamic typing so there is no need to specify %d. However, if you ran the above then var1 and var2 would be both Strings. You can convert them to int using another line

var1, var2 = [int(var1), int(var2)]

Or you could use list comprehension

var1, var2 = [int(x) for x in [var1, var2]]

To sum it up, you could have done the whole thing with this one-liner:

# Python 3
var1, var2 = [int(x) for x in input("Enter two numbers here: ").split()]

# Python 2
var1, var2 = [int(x) for x in raw_input("Enter two numbers here: ").split()]

jQuery UI Accordion Expand/Collapse All

I found AlecRust's solution quite helpful, but I add something to resolve one problem: When you click on a single accordion to expand it and then you click on the button to expand, they will all be opened. But, if you click again on the button to collapse, the single accordion expand before won't be collapse.

I've used imageButton, but you can also apply that logic to buttons.

/*** Expand all ***/
$(".expandAll").click(function (event) {
    $('.accordion .ui-accordion-header:not(.ui-state-active)').next().slideDown();

    return false;
});

/*** Collapse all ***/
$(".collapseAll").click(function (event) {
    $('.accordion').accordion({
        collapsible: true,
        active: false
    });

    $('.accordion .ui-accordion-header').next().slideUp();

    return false;
});

Also, if you have accordions inside an accordion and you want to expand all only on that second level, you can add a query:

/*** Expand all Second Level ***/
$(".expandAll").click(function (event) {
    $('.accordion .ui-accordion-header:not(.ui-state-active)').nextAll(':has(.accordion .ui-accordion-header)').slideDown();

    return false;
});

How to inflate one view with a layout

You inflate an XML resource. See the LayoutInflater doc .

If your layout is in a mylayout.xml, you would do something like:

View view; 
LayoutInflater inflater = (LayoutInflater)   getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
view = inflater.inflate(R.layout.mylayout, null);

RelativeLayout item = (RelativeLayout) view.findViewById(R.id.item);

How can I create a progress bar in Excel VBA?

Sometimes a simple message in the status bar is enough:

Message in Excel status bar using VBA

This is very simple to implement:

Dim x               As Integer 
Dim MyTimer         As Double 

'Change this loop as needed.
For x = 1 To 50
    ' Do stuff
    Application.StatusBar = "Progress: " & x & " of 50: " & Format(x / 50, "0%")
Next x 

Application.StatusBar = False

How to filter data in dataview

DataView view = new DataView();
view.Table = DataSet1.Tables["Suppliers"];
view.RowFilter = "City = 'Berlin'";
view.RowStateFilter = DataViewRowState.ModifiedCurrent;
view.Sort = "CompanyName DESC";

// Simple-bind to a TextBox control
Text1.DataBindings.Add("Text", view, "CompanyName");

Ref: http://www.csharp-examples.net/dataview-rowfilter/

http://msdn.microsoft.com/en-us/library/system.data.dataview.rowfilter.aspx

jQuery show/hide not working

The content is not ready yet, you can move your js to the end of the file or do

<script>
$(function () { 
    $( '.expand' ).click(function() {
       $( '.img_display_content' ).show();
    });
});

So that the document waits to be loaded before running.

how to run a winform from console application?

It´s very simple to do:

Just add following attribute and code to your Main-method:

[STAThread]
void Main(string[] args])
{
   Application.EnableVisualStyles();
   //Do some stuff...
   while(!Exit)
   {
       Application.DoEvents(); //Now if you call "form.Show()" your form won´t be frozen
       //Do your stuff
   }
}

Now you´re fully able to show WinForms :)

Enter key pressed event handler

For those who struggle at capturing Enter key on TextBox or other input control, if your Form has AcceptButton defined, you will not be able to use KeyDown event to capture Enter.

What you should do is to catch the Enter key at form level. Add this code to the form:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if ((this.ActiveControl == myTextBox) && (keyData == Keys.Return))
    {
        //do something
        return true;
    }
    else
    {
        return base.ProcessCmdKey(ref msg, keyData);
    }
}

How can I remove an entry in global configuration with git config?

You can check all the config settings using

git config --global --list

You can remove the setting for example username

git config --global --unset user.name

You can edit the configuration or remove the config setting manually by hand using:

git config --global --edit

How do I automatically update a timestamp in PostgreSQL

Using 'now()' as default value automatically generates time-stamp.

How to navigate back to the last cursor position in Visual Studio Code?

Alt+? / ?

You can find here all shortcuts

https://code.visualstudio.com/docs/customization/keybindings

sql server Get the FULL month name from a date

109 - mon dd yyyy (In SQL conversion)

The required format is April 1 2009

 SELECT DATENAME(MONTH, GETDATE()) + RIGHT(CONVERT(VARCHAR(12), GETDATE(), 109), 9)

Result is:

Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener

If you are sure you haven't messed the jar, then please clean the project and perform mvn clean install. This should solve the problem.

Resize an Array while keeping current elements in Java?

It is not possible to change the Array Size. But you can copy the element of one array into another array by creating an Array of bigger size.

It is recommended to create Array of double size if Array is full and Reduce Array to halve if Array is one-half full

public class ResizingArrayStack1 {
    private String[] s;
    private int size = 0;
    private int index = 0;

    public void ResizingArrayStack1(int size) {
        this.size = size;
        s = new String[size];
    }


    public void push(String element) {
        if (index == s.length) {
            resize(2 * s.length);
        }
        s[index] = element;
        index++;
    }

    private void resize(int capacity) {
        String[] copy = new String[capacity];
        for (int i = 0; i < s.length; i++) {
            copy[i] = s[i];
            s = copy;
        }
    }

    public static void main(String[] args) {
        ResizingArrayStack1 rs = new ResizingArrayStack1();
        rs.push("a");
        rs.push("b");
        rs.push("c");
        rs.push("d");
    }
}

What is the difference between response.sendRedirect() and request.getRequestDispatcher().forward(request,response)

1.redirect return the request to the browser from server,then resend the request to the server from browser.

2.forward send the request to another servlet (servlet to servlet).

The simplest possible JavaScript countdown timer?

If you want a real timer you need to use the date object.

Calculate the difference.

Format your string.

window.onload=function(){
      var start=Date.now(),r=document.getElementById('r');
      (function f(){
      var diff=Date.now()-start,ns=(((3e5-diff)/1e3)>>0),m=(ns/60)>>0,s=ns-m*60;
      r.textContent="Registration closes in "+m+':'+((''+s).length>1?'':'0')+s;
      if(diff>3e5){
         start=Date.now()
      }
      setTimeout(f,1e3);
      })();
}

Example

Jsfiddle

not so precise timer

var time=5*60,r=document.getElementById('r'),tmp=time;

setInterval(function(){
    var c=tmp--,m=(c/60)>>0,s=(c-m*60)+'';
    r.textContent='Registration closes in '+m+':'+(s.length>1?'':'0')+s
    tmp!=0||(tmp=time);
},1000);

JsFiddle

String literals and escape characters in postgresql

I find it highly unlikely for Postgres to truncate your data on input - it either rejects it or stores it as is.

milen@dev:~$ psql
Welcome to psql 8.2.7, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

milen=> create table EscapeTest (text varchar(50));
CREATE TABLE
milen=> insert into EscapeTest (text) values ('This will be inserted \n This will not be');
WARNING:  nonstandard use of escape in a string literal
LINE 1: insert into EscapeTest (text) values ('This will be inserted...
                                              ^
HINT:  Use the escape string syntax for escapes, e.g., E'\r\n'.
INSERT 0 1
milen=> select * from EscapeTest;
          text
------------------------
 This will be inserted
  This will not be
(1 row)

milen=>

Method List in Visual Studio Code

There's no such feature today, the CTRL+SHIFT+O == CTRL+P @ doesn't work for all languages.

As a last resort you can use the search panel - although it is not so fast an easy to use as you'd like - you can enter this regex in the search panel to find all functions:

function\s([_A-Za-z0-9]+)\s*\(

Does IE9 support console.log, and is it a real function?

I would like to mention that IE9 does not raise the error if you use console.log with developer tools closed on all versions of Windows. On XP it does, but on Windows 7 it doesn't. So if you dropped support for WinXP in general, you're fine using console.log directly.

Check if XML Element exists

//I am finding childnode ERNO at 2nd but last place

If StrComp(xmlnode(i).ChildNodes.Item(xmlnode(i).ChildNodes.Count - 1).Name.ToString(), "ERNO", CompareMethod.Text) = 0 Then
                xmlnode(i).ChildNodes.Item(xmlnode(i).ChildNodes.Count - 1).InnerText = c
            Else
                elem = xmldoc.CreateElement("ERNo")
                elem.InnerText = c.ToString
                root.ChildNodes(i).AppendChild(elem)
            End If

How to read value of a registry key c#

You need to first add using Microsoft.Win32; to your code page.

Then you can begin to use the Registry classes:

try
{
    using (RegistryKey key = Registry.LocalMachine.OpenSubKey("Software\\Wow6432Node\\MySQL AB\\MySQL Connector\\Net"))
    {
        if (key != null)
        {
            Object o = key.GetValue("Version");
            if (o != null)
            {
                Version version = new Version(o as String);  //"as" because it's REG_SZ...otherwise ToString() might be safe(r)
                //do what you like with version
            }
        }
    }
}
catch (Exception ex)  //just for demonstration...it's always best to handle specific exceptions
{
    //react appropriately
}

BEWARE: unless you have administrator access, you are unlikely to be able to do much in LOCAL_MACHINE. Sometimes even reading values can be a suspect operation without admin rights.

How to get the Android Emulator's IP address?

public String getLocalIpAddress() {

    try {
        for (Enumeration < NetworkInterface > en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
            NetworkInterface intf = en.nextElement();
            for (Enumeration < InetAddress > enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                InetAddress inetAddress = enumIpAddr.nextElement();
                if (!inetAddress.isLoopbackAddress()) {
                    return inetAddress.getHostAddress().toString();
                }
            }
        }
    } catch (SocketException ex) {
        Log.e(LOG_TAG, ex.toString());
    }
    return null;
}

What is the idiomatic Go equivalent of C's ternary operator?

Suppose you have the following ternary expression (in C):

int a = test ? 1 : 2;

The idiomatic approach in Go would be to simply use an if block:

var a int

if test {
  a = 1
} else {
  a = 2
}

However, that might not fit your requirements. In my case, I needed an inline expression for a code generation template.

I used an immediately evaluated anonymous function:

a := func() int { if test { return 1 } else { return 2 } }()

This ensures that both branches are not evaluated as well.

'numpy.float64' object is not iterable

numpy.linspace() gives you a one-dimensional NumPy array. For example:

>>> my_array = numpy.linspace(1, 10, 10)
>>> my_array
array([  1.,   2.,   3.,   4.,   5.,   6.,   7.,   8.,   9.,  10.])

Therefore:

for index,point in my_array

cannot work. You would need some kind of two-dimensional array with two elements in the second dimension:

>>> two_d = numpy.array([[1, 2], [4, 5]])
>>> two_d
array([[1, 2], [4, 5]])

Now you can do this:

>>> for x, y in two_d:
    print(x, y)

1 2
4 5

Downloading jQuery UI CSS from Google's CDN

The Google AJAX Libraries API, which includes jQuery UI (currently v1.10.3), also includes popular themes as per the jQuery UI blog:

Google Ajax Libraries API (CDN)

Uncompressed: http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.js
Compressed: http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js
Themes Uncompressed: black-tie, blitzer, cupertino, dark-hive, dot-luv, eggplant, excite-bike, flick, hot-sneaks, humanity, le-frog, mint-choc, overcast,pepper-grinder, redmond, smoothness, south-street, start, sunny, swanky-purse, trontastic, ui-darkness, ui-lightness, and vader.
Themes Compressed: black-tie, blitzer, cupertino, dark-hive, dot-luv, eggplant, excite-bike, flick, hot-sneaks, humanity, le-frog, mint-choc, overcast,pepper-grinder, redmond, smoothness, south-street, start, sunny, swanky-purse, trontastic, ui-darkness, ui-lightness, and vader.

What does java:comp/env/ do?

Quoting https://web.archive.org/web/20140227201242/http://v1.dione.zcu.cz/java/docs/jndi-1.2/tutorial/beyond/misc/policy.html

At the root context of the namespace is a binding with the name "comp", which is bound to a subtree reserved for component-related bindings. The name "comp" is short for component. There are no other bindings at the root context. However, the root context is reserved for the future expansion of the policy, specifically for naming resources that are tied not to the component itself but to other types of entities such as users or departments. For example, future policies might allow you to name users and organizations/departments by using names such as "java:user/alice" and "java:org/engineering".

In the "comp" context, there are two bindings: "env" and "UserTransaction". The name "env" is bound to a subtree that is reserved for the component's environment-related bindings, as defined by its deployment descriptor. "env" is short for environment. The J2EE recommends (but does not require) the following structure for the "env" namespace.

So the binding you did from spring or, for example, from a tomcat context descriptor go by default under java:comp/env/

For example, if your configuration is:

<bean id="someId" class="org.springframework.jndi.JndiObjectFactoryBean">
  <property name="jndiName" value="foo"/>
</bean>

Then you can access it directly using:

Context ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:comp/env/foo");

or you could make an intermediate step so you don't have to specify "java:comp/env" for every resource you retrieve:

Context ctx = new InitialContext();
Context envCtx = (Context)ctx.lookup("java:comp/env");
DataSource ds = (DataSource)envCtx.lookup("foo");

AngularJS event on window innerWidth size change

If Khanh TO's solution caused UI issues for you (like it did for me) try using $timeout to not update the attribute until it has been unchanged for 500ms.

var oldWidth = window.innerWidth;
$(window).on('resize.doResize', function () {
    var newWidth = window.innerWidth,
        updateStuffTimer;

    if (newWidth !== oldWidth) {
        $timeout.cancel(updateStuffTimer);
    }

    updateStuffTimer = $timeout(function() {
         updateStuff(newWidth); // Update the attribute based on window.innerWidth
    }, 500);
});

$scope.$on('$destroy',function (){
    $(window).off('resize.doResize'); // remove the handler added earlier
});

Reference: https://gist.github.com/tommaitland/7579618

Split string with multiple delimiters in Python

Do a str.replace('; ', ', ') and then a str.split(', ')

Update one MySQL table with values from another

UPDATE tobeupdated
INNER JOIN original ON (tobeupdated.value = original.value)
SET tobeupdated.id = original.id

That should do it, and really its doing exactly what yours is. However, I prefer 'JOIN' syntax for joins rather than multiple 'WHERE' conditions, I think its easier to read

As for running slow, how large are the tables? You should have indexes on tobeupdated.value and original.value

EDIT: we can also simplify the query

UPDATE tobeupdated
INNER JOIN original USING (value)
SET tobeupdated.id = original.id

USING is shorthand when both tables of a join have an identical named key such as id. ie an equi-join - http://en.wikipedia.org/wiki/Join_(SQL)#Equi-join

How to get Spinner value?

Spinner mySpinner = (Spinner) findViewById(R.id.your_spinner);
String text = mySpinner.getSelectedItem().toString();

How do I find the current directory of a batch file, and then use it for the path?

You can also do

 Pushd "%~dp0"

Which also takes running from a unc path into consideration.

Name [jdbc/mydb] is not bound in this Context

you put resource-ref in the description tag in web.xml

Pan & Zoom Image

@ Merk

For ur solution insted of lambda expression you can use following code:

//var tt = (TranslateTransform)((TransformGroup)image.RenderTransform).Children.First(tr => tr is TranslateTransform);
        TranslateTransform tt = null;
        TransformGroup transformGroup = (TransformGroup)grid.RenderTransform;
        for (int i = 0; i < transformGroup.Children.Count; i++)
        {
            if (transformGroup.Children[i] is TranslateTransform)
                tt = (TranslateTransform)transformGroup.Children[i];
        }

this code can be use as is for .Net Frame work 3.0 or 2.0

Hope It helps you :-)

Error "File google-services.json is missing from module root folder. The Google Services Plugin cannot function without it"

in my case i have saved a json file with a space like this

google-services .json

and the right one is

google-services.json

and also take care you do not put (_) instead of (-)

may help some one.

Get the current script file name

Try this

_x000D_

$file = basename($_SERVER['PATH_INFO']);//Filename requested

_x000D_

What is a practical, real world example of the Linked List?

A linked list can be used to implement a queue. The canonical real life example would be a line for a cashier.

A linked list can also be used to implement a stack. The cononical real ife example would be one of those plate dispensers at a buffet restaurant where pull the top plate off the top of the stack.

Powershell command to hide user from exchange address lists

I was getting the exact same error, however I solved it by running $false first and then $true.

How to retrieve the first word of the output of a command in bash?

echo "word1 word2" | cut -f 1 -d " "

cut cuts the 1st field (-f 1) from a list of fields delimited by the string " " (-d " ")

.NET NewtonSoft JSON deserialize map to a different property name

Expanding Rentering.com's answer, in scenarios where a whole graph of many types is to be taken care of, and you're looking for a strongly typed solution, this class can help, see usage (fluent) below. It operates as either a black-list or white-list per type. A type cannot be both (Gist - also contains global ignore list).

public class PropertyFilterResolver : DefaultContractResolver
{
  const string _Err = "A type can be either in the include list or the ignore list.";
  Dictionary<Type, IEnumerable<string>> _IgnorePropertiesMap = new Dictionary<Type, IEnumerable<string>>();
  Dictionary<Type, IEnumerable<string>> _IncludePropertiesMap = new Dictionary<Type, IEnumerable<string>>();
  public PropertyFilterResolver SetIgnoredProperties<T>(params Expression<Func<T, object>>[] propertyAccessors)
  {
    if (propertyAccessors == null) return this;

    if (_IncludePropertiesMap.ContainsKey(typeof(T))) throw new ArgumentException(_Err);

    var properties = propertyAccessors.Select(GetPropertyName);
    _IgnorePropertiesMap[typeof(T)] = properties.ToArray();
    return this;
  }

  public PropertyFilterResolver SetIncludedProperties<T>(params Expression<Func<T, object>>[] propertyAccessors)
  {
    if (propertyAccessors == null)
      return this;

    if (_IgnorePropertiesMap.ContainsKey(typeof(T))) throw new ArgumentException(_Err);

    var properties = propertyAccessors.Select(GetPropertyName);
    _IncludePropertiesMap[typeof(T)] = properties.ToArray();
    return this;
  }

  protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
  {
    var properties = base.CreateProperties(type, memberSerialization);

    var isIgnoreList = _IgnorePropertiesMap.TryGetValue(type, out IEnumerable<string> map);
    if (!isIgnoreList && !_IncludePropertiesMap.TryGetValue(type, out map))
      return properties;

    Func<JsonProperty, bool> predicate = jp => map.Contains(jp.PropertyName) == !isIgnoreList;
    return properties.Where(predicate).ToArray();
  }

  string GetPropertyName<TSource, TProperty>(
  Expression<Func<TSource, TProperty>> propertyLambda)
  {
    if (!(propertyLambda.Body is MemberExpression member))
      throw new ArgumentException($"Expression '{propertyLambda}' refers to a method, not a property.");

    if (!(member.Member is PropertyInfo propInfo))
      throw new ArgumentException($"Expression '{propertyLambda}' refers to a field, not a property.");

    var type = typeof(TSource);
    if (!type.GetTypeInfo().IsAssignableFrom(propInfo.DeclaringType.GetTypeInfo()))
      throw new ArgumentException($"Expresion '{propertyLambda}' refers to a property that is not from type '{type}'.");

    return propInfo.Name;
  }
}

Usage:

var resolver = new PropertyFilterResolver()
  .SetIncludedProperties<User>(
    u => u.Id, 
    u => u.UnitId)
  .SetIgnoredProperties<Person>(
    r => r.Responders)
  .SetIncludedProperties<Blog>(
    b => b.Id)
  .Ignore(nameof(IChangeTracking.IsChanged)); //see gist

How to complete the RUNAS command in one line

The runas command does not allow a password on its command line. This is by design (and also the reason you cannot pipe a password to it as input). Raymond Chen says it nicely:

The RunAs program demands that you type the password manually. Why doesn't it accept a password on the command line?

This was a conscious decision. If it were possible to pass the password on the command line, people would start embedding passwords into batch files and logon scripts, which is laughably insecure.

In other words, the feature is missing to remove the temptation to use the feature insecurely.

How do you do Impersonation in .NET?

Here is some good overview of .NET impersonation concepts.

Basically you will be leveraging these classes that are out of the box in the .NET framework:

The code can often get lengthy though and that is why you see many examples like the one you reference that try to simplify the process.

Connection attempt failed with "ECONNREFUSED - Connection refused by server"

Use port number 22 (for sftp) instead of 21 (normal ftp). Solved this problem for me.

Detach (move) subdirectory into separate Git repository

Proper way now is the following:

git filter-branch --prune-empty --subdirectory-filter FOLDER_NAME [first_branch] [another_branch]

GitHub now even have small article about such cases.

But be sure to clone your original repo to separate directory first (as it would delete all the files and other directories and you probable need to work with them).

So your algorithm should be:

clone your remote repo to another directory
using git filter-branch left only files under some subdirectory, push to new remote
create commit to remove this subdirectory from your original remote repo

How to undo 'git reset'?

My situation was slightly different, I did git reset HEAD~ three times.

To undo it I had to do

git reset HEAD@{3}

so you should be able to do

git reset HEAD@{N}

But if you have done git reset using

git reset HEAD~3

you will need to do

git reset HEAD@{1}

{N} represents the number of operations in reflog, as Mark pointed out in the comments.

How to install "ifconfig" command in my ubuntu docker image?

sudo apt-get install iproute2 then run ip addr show

it works..

What was the strangest coding standard rule that you were forced to follow?

There must be 165 unit tests (not necessarily automated) per 1000 lines of code. That works out at one test for roughly every 8 lines.

Needless to say, some of the lines of code are quite long, and functions return this pointers to allow chaining.

Bootstrap 3 panel header with buttons wrong position

I placed the button group inside the title, and then added a clearfix to the bottom.

<div class="panel-heading">
  <h4 class="panel-title">
    Panel header
    <div class="btn-group pull-right">
      <a href="#" class="btn btn-default btn-sm">## Lock</a>
      <a href="#" class="btn btn-default btn-sm">## Delete</a>
      <a href="#" class="btn btn-default btn-sm">## Move</a>
    </div>
  </h4>
  <div class="clearfix"></div>
</div>

How to get the file ID so I can perform a download of a file from Google Drive API on Android?

Stan0 intial idea is not a good idea. There can be multiple files with the same name. Very error prone implementation. Stan0's second idea is the correct way.

When you first upload the file to google drive store its id (in SharedPreferences is probably easiest) for later use

ie.

file= mDrive.files().insert(body).execute();      //initial insert of file to google drive

whereverYouWantToStoreIt= file.getId(); //now you have the guaranteed unique id 
                                        //of the file just inserted. Store it and use it 
                                        //whenever you need to fetch this file

Converting HTML files to PDF

Amyuni WebkitPDF could be used with JNI for a Windows-only solution. This is a HTML to PDF/XAML conversion library, free for commercial and non-commercial use.

If the output files are not needed immediately, for better scalability it may be better to have a queue and a few background processes taking items from there, converting them and storing then on the database or file system.

usual disclaimer applies

How to wait until an element exists?

I used this approach to wait for an element to appear so I can execute the other functions after that.

Let's say doTheRestOfTheStuff(parameters) function should only be called after the element with ID the_Element_ID appears or finished loading, we can use,

var existCondition = setInterval(function() {
 if ($('#the_Element_ID').length) {
    console.log("Exists!");
    clearInterval(existCondition);
    doTheRestOfTheStuff(parameters);
 }
}, 100); // check every 100ms

Getting Database connection in pure JPA setup

Below is the code that worked for me. We use jpa 1.0, Apache openjpa implementation.

import java.sql.Connection;
import org.apache.openjpa.persistence.OpenJPAEntityManager;
import org.apache.openjpa.persistence.OpenJPAPersistence;

public final class MsSqlDaoFactory {


       public static final Connection getConnection(final EntityManager entityManager) {
              OpenJPAEntityManager openJPAEntityManager = OpenJPAPersistence.cast(entityManager);
              Connection connection = (Connection) openJPAEntityManager.getConnection();
              return connection;

        }

}

How to test for $null array in PowerShell

How do you want things to behave?

If you want arrays with no elements to be treated the same as unassigned arrays, use:

[array]$foo = @() #example where we'd want TRUE to be returned
@($foo).Count -eq 0

If you want a blank array to be seen as having a value (albeit an empty one), use:

[array]$foo = @() #example where we'd want FALSE to be returned
$foo.PSObject -eq $null

If you want an array which is populated with only null values to be treated as null:

[array]$foo = $null,$null
@($foo | ?{$_.PSObject}).Count -eq 0

NB: In the above I use $_.PSObject over $_ to avoid [bool]$false, [int]0, [string]'', etc from being filtered out; since here we're focussed solely on nulls.

How to configure multi-module Maven + Sonar + JaCoCo to give merged coverage report?

to have unit-testing AND integration-testing you can use maven-surefire-plugin and maven-failsafe-plugin with restricted includes/excludes. I was playing with CDI while getting in touch with sonar/jacoco, so i ended up in this project:

https://github.com/FibreFoX/cdi-sessionscoped-login/

Maybe it helps you a little bit. in my pom.xml i use "-javaagent" implicit by setting the argLine-option in the configuration-section of the specified testing-plugins. Explicit using ANT in MAVEN projects is something i would not give a try, for me its to much mixing two worlds.

I only have a single-module maven project, but maybe it helps you to adjust yours to work.

note: maybe not all maven-plugins are up2date, maybe some issues are fixed in later versions

How to make a drop down list in yii2?

There are some good solutions above, and mine is just a combination of two (I came here looking for a solution).

@Sarvar Nishonboyev's solution is good because it maintains the creation of the form input label and help-block for error messages.

I went with:

<?php
use yii\helpers\ArrayHelper;
use app\models\Product;
?>
<?=
$form->field($model, 'parent_id')
     ->dropDownList(
            ArrayHelper::map(Product::find()->asArray()->all(), 'parent_id', 'name')
            )
?>

Again, full credit to: @Sarvar Nishonboyev's and @ippi

How to disable javax.swing.JButton in java?

For that I have written the following code in the "ActionPeformed(...)" method of the "Start" button

You need that code to be in the actionPerformed(...) of the ActionListener registered with the Start button, not for the Start button itself.

You can add a simple ActionListener like this:

JButton startButton = new JButton("Start");
startButton.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent ae) {
        startButton.setEnabled(false);
        stopButton.setEnabled(true);
     }
   }
 );

note that your startButton above will need to be final in the above example if you want to create the anonymous listener in local scope.

C++ error 'Undefined reference to Class::Function()'

What are you using to compile this? If there's an undefined reference error, usually it's because the .o file (which gets created from the .cpp file) doesn't exist and your compiler/build system is not able to link it.

Also, in your card.cpp, the function should be Card::Card() instead of void Card. The Card:: is scoping; it means that your Card() function is a member of the Card class (which it obviously is, since it's the constructor for that class). Without this, void Card is just a free function. Similarly,

void Card(Card::Rank rank, Card::Suit suit)

should be

Card::Card(Card::Rank rank, Card::Suit suit)

Also, in deck.cpp, you are saying #include "Deck.h" even though you referred to it as deck.h. The includes are case sensitive.

How to remove all CSS classes using jQuery/JavaScript?

Hang on, doesn't removeClass() default to removing all classes if nothing specific is specified? So

$("#item").removeClass();

will do it on its own...

Create an enum with string values

export enum PaymentType {
                Cash = 1,
                Credit = 2
            }
var paymentType = PaymentType[PaymentType.Cash];

Detect click outside element

For Vue 3:

This answer is based on MadisonTrash's great answer above but updated to use new Vue 3 syntax.

Vue 3 now uses beforeMount instead of bind, and unmounted instead of unbind (src).

const clickOutside = {
  beforeMount: (el, binding) => {
    el.clickOutsideEvent = event => {
      // here I check that click was outside the el and his children
      if (!(el == event.target || el.contains(event.target))) {
        // and if it did, call method provided in attribute value
        binding.value();
      }
    };
    document.addEventListener("click", el.clickOutsideEvent);
  },
  unmounted: el => {
    document.removeEventListener("click", el.clickOutsideEvent);
  },
};

createApp(App)
  .directive("click-outside", clickOutside)
  .mount("#app");

Dividing two integers to produce a float result

Cast the operands to floats:

float ans = (float)a / (float)b;

Using If/Else on a data frame

Try this

frame$twohouses <- ifelse(frame$data>1, 2, 1)
 frame
   data twohouses
1     0         1
2     1         1
3     2         2
4     3         2
5     4         2
6     2         2
7     3         2
8     1         1
9     4         2
10    3         2
11    2         2
12    4         2
13    0         1
14    1         1
15    2         2
16    0         1
17    2         2
18    1         1
19    2         2
20    0         1
21    4         2

JavaScript pattern for multiple constructors

Going further with eruciform's answer, you can chain your new call into your init method.

function Foo () {
    this.bar = 'baz';
}

Foo.prototype.init_1 = function (bar) {
    this.bar = bar;
    return this;
};

Foo.prototype.init_2 = function (baz) {
    this.bar = 'something to do with '+baz;
    return this;
};

var a = new Foo().init_1('constructor 1');
var b = new Foo().init_2('constructor 2');

"The following SDK components were not installed: sys-img-x86-addon-google_apis-google-22 and addon-google_apis-google-22"

i have solve my same problem

i update my android studio, and i choose not to import my setting from my previous version than that problem appear.

than i realize that i have 2 AndroidStudio folder on my windows account (.AndroidStudio and .AndroidStudio1.2) and on my new .AndroidStudio1.2 folder there are no other.xml file.

than i copy other.xml file from C:\Users\my windows account name.AndroidStudio\config\options to C:\Users\my windows account name.AndroidStudio1.2\config\options

and that how i solve my problem.

Display date/time in user's locale format and time offset

_x000D_

// new Date(year, monthIndex [, day [, hours [, minutes [, seconds [, milliseconds]]]]])_x000D_
var serverDate = new Date(2018, 5, 30, 19, 13, 15); // just any date that comes from server_x000D_
var serverDateStr = serverDate.toLocaleString("en-US", {_x000D_
  year: 'numeric',_x000D_
  month: 'numeric',_x000D_
  day: 'numeric',_x000D_
  hour: 'numeric',_x000D_
  minute: 'numeric',_x000D_
  second: 'numeric'_x000D_
})_x000D_
var userDate = new Date(serverDateStr + " UTC");_x000D_
var locale = window.navigator.userLanguage || window.navigator.language;_x000D_
_x000D_
var clientDateStr = userDate.toLocaleString(locale, {_x000D_
  year: 'numeric',_x000D_
  month: 'numeric',_x000D_
  day: 'numeric'_x000D_
});_x000D_
_x000D_
var clientDateTimeStr = userDate.toLocaleString(locale, {_x000D_
  year: 'numeric',_x000D_
  month: 'numeric',_x000D_
  day: 'numeric',_x000D_
  hour: 'numeric',_x000D_
  minute: 'numeric',_x000D_
  second: 'numeric'_x000D_
});_x000D_
_x000D_
console.log("Server UTC date: " + serverDateStr);_x000D_
console.log("User's local date: " + clientDateStr);_x000D_
console.log("User's local date&time: " + clientDateTimeStr);

_x000D_

How to change context root of a dynamic web project in Eclipse?

I just wanted to add that if you don't want your application name in the root context at all, you and just put "/" (no quotes, just the forward slash) in the Eclipse --> Web Project Settings --> Context Root entry

That will deploy the webapp to just http://localhost:8080/

Of course, this will cause problems with other webapps you try to run on the server, so heads up with that.

Took me forever to piece that together... so even though this post is 8 years old, hopefully this will still help someone!

HTTP Status 500 - org.apache.jasper.JasperException: java.lang.NullPointerException

NullPointerException with JSP can also happen if:

A getter returns a non-public inner class.

This code will fail if you remove Getters's access modifier or make it private or protected.

JAVA:

package com.myPackage;
public class MyClass{ 
    //: Must be public or you will get:
    //: org.apache.jasper.JasperException: 
    //: java.lang.NullPointerException
    public class Getters{
        public String 
        myProperty(){ return(my_property); }
    };;

    //: JSP EL can only access functions:
    private Getters _get;
    public  Getters  get(){ return _get; }

    private String 
    my_property;

    public MyClass(String my_property){
        super();
        this.my_property    = my_property;
        _get = new Getters();
    };;
};;

JSP

<%@ taglib uri   ="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="com.myPackage.MyClass" %>
<%
    MyClass inst = new MyClass("[PROP_VALUE]");
    pageContext.setAttribute("my_inst", inst ); 
%><html lang="en"><body>
    ${ my_inst.get().myProperty() }
</body></html>

Count all duplicates of each value

You'd want the COUNT operator.

SELECT NUMBER, COUNT(*) 
FROM T_NAME
GROUP BY NUMBER
ORDER BY NUMBER ASC

CSS background-image-opacity?

#id {
  position: relative;
  opacity: 0.99;
}

#id::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: url('image.png');
  opacity: 0.3;
}

Hack with opacity 0.99 (less than 1) creates z-index context so you can not worry about global z-index values. (Try to remove it and see what happens in the next demo where parent wrapper has positive z-index.)
If your element already has z-index, then you don't need this hack.

Demo.

How can I find the last element in a List<>?

I would have to agree a foreach would be a lot easier something like

foreach(AllIntegerIDs allIntegerIDs in integerList)
{
Console.WriteLine("{0}\t{1}\t{2}\t{3}\t{4}\n", allIntegerIDs.m_MessageID,
allIntegerIDs.m_MessageType,
allIntegerIDs.m_ClassID,
allIntegerIDs.m_CategoryID,
allIntegerIDs.m_MessageText);
}

Also I would suggest you add properties to access your information instead of public fields, depending on your .net version you can add it like public int MessageType {get; set;} and get rid of the m_ from your public fields, properties etc as it shouldnt be there.

Adding link a href to an element using css

You cannot simply add a link using CSS. CSS is used for styling.

You can style your using CSS.

If you want to give a link dynamically to then I will advice you to use jQuery or Javascript.

You can accomplish that very easily using jQuery.

I have done a sample for you. You can refer that.

URL : http://jsfiddle.net/zyk9w/

$('#link').attr('href','http://www.google.com');

This single line will do the trick.

Delegation: EventEmitter or Observable in Angular

I found out another solution for this case without using Reactivex neither services. I actually love the rxjx API however I think it goes best when resolving an async and/or complex function. Using It in that way, Its pretty exceeded to me.

What I think you are looking for is for a broadcast. Just that. And I found out this solution:

<app>
  <app-nav (selectedTab)="onSelectedTab($event)"></app-nav>
       // This component bellow wants to know when a tab is selected
       // broadcast here is a property of app component
  <app-interested [broadcast]="broadcast"></app-interested>
</app>

 @Component class App {
   broadcast: EventEmitter<tab>;

   constructor() {
     this.broadcast = new EventEmitter<tab>();
   }

   onSelectedTab(tab) {
     this.broadcast.emit(tab)
   }    
 }

 @Component class AppInterestedComponent implements OnInit {
   broadcast: EventEmitter<Tab>();

   doSomethingWhenTab(tab){ 
      ...
    }     

   ngOnInit() {
     this.broadcast.subscribe((tab) => this.doSomethingWhenTab(tab))
   }
 }

This is a full working example: https://plnkr.co/edit/xGVuFBOpk2GP0pRBImsE

Escaping special characters in Java Regular Expressions

The Pattern.quote(String s) sort of does what you want. However it leaves a little left to be desired; it doesn't actually escape the individual characters, just wraps the string with \Q...\E.

There is not a method that does exactly what you are looking for, but the good news is that it is actually fairly simple to escape all of the special characters in a Java regular expression:

regex.replaceAll("[\\W]", "\\\\$0")

Why does this work? Well, the documentation for Pattern specifically says that its permissible to escape non-alphabetic characters that don't necessarily have to be escaped:

It is an error to use a backslash prior to any alphabetic character that does not denote an escaped construct; these are reserved for future extensions to the regular-expression language. A backslash may be used prior to a non-alphabetic character regardless of whether that character is part of an unescaped construct.

For example, ; is not a special character in a regular expression. However, if you escape it, Pattern will still interpret \; as ;. Here are a few more examples:

> becomes \> which is equivalent to >
[ becomes \[ which is the escaped form of [
8 is still 8.
\) becomes \\\) which is the escaped forms of \ and ( concatenated.

Note: The key is is the definition of "non-alphabetic", which in the documentation really means "non-word" characters, or characters outside the character set [a-zA-Z_0-9].

Eclipse reports rendering library more recent than ADT plug-in

Click Help > Install New Software.
In the Work with field, enter: https://dl-ssl.google.com/android/eclipse/
Select Developer Tools / Android Development Tools.
Click Next and complete the wizard.

How can I print using JQuery

function printResult() {
    var DocumentContainer = document.getElementById('your_div_id');
    var WindowObject = window.open('', "PrintWindow", "width=750,height=650,top=50,left=50,toolbars=no,scrollbars=yes,status=no,resizable=yes");
    WindowObject.document.writeln(DocumentContainer.innerHTML);
    WindowObject.document.close();
    WindowObject.focus();
    WindowObject.print();
    WindowObject.close();
}

Web.Config Debug/Release

It is possible using ConfigTransform build target available as a Nuget package - https://www.nuget.org/packages/CodeAssassin.ConfigTransform/

All "web.*.config" transform files will be transformed and output as a series of "web.*.config.transformed" files in the build output directory regardless of the chosen build configuration.

The same applies to "app.*.config" transform files in non-web projects.

and then adding the following target to your *.csproj.

<Target Name="TransformActiveConfiguration" Condition="Exists('$(ProjectDir)/Web.$(Configuration).config')" BeforeTargets="Compile" >
    <TransformXml Source="$(ProjectDir)/Web.Config" Transform="$(ProjectDir)/Web.$(Configuration).config" Destination="$(TargetDir)/Web.config" />
</Target>

Posting an answer as this is the first Stackoverflow post that appears in Google on the subject.

add onclick function to a submit button

if you need to do something before submitting data, you could use form's onsubmit.

<form method=post onsubmit="return doSomething()">
  <input type=text name=text1>
  <input type=submit>
</form>

Receiving login prompt using integrated windows authentication

Windows authentication in IIS7.0 or IIS7.5 does not work with kerberos (provider=Negotiate) when the application pool identity is ApplicationPoolIdentity One has to use Network Service or another build-in account. Another possibility is to use NTLM to get Windows Authenticatio to work (in Windows Authentication, Providers, put NTLM on top or remove negotiate)

chris van de vijver

How to get the current location in Google Maps Android API v2?

Try This

public class MyLocationListener implements LocationListener
{

 @Override

public void onLocationChanged(Location loc)
{

loc.getLatitude();

loc.getLongitude();

String Text = “My current location is: ” +

“Latitud = ” + loc.getLatitude() +

“Longitud = ” + loc.getLongitude();

Toast.makeText( getApplicationContext(),Text,   Toast.LENGTH_SHORT).show();



tvlat.setText(“”+loc.getLatitude());

tvlong.setText(“”+loc.getLongitude());

this.gpsCurrentLocation();

}

What does this error mean: "error: expected specifier-qualifier-list before 'type_name'"?

You have to name your struct like that:

typedef struct car_t {

   char

   wheel_t

} car_t;

Maximum and Minimum values for ints

sys.maxsize is not the actually the maximum integer value which is supported. You can double maxsize and multiply it by itself and it stays a valid and correct value.

However, if you try sys.maxsize ** sys.maxsize, it will hang your machine for a significant amount of time. As many have pointed out, the byte and bit size does not seem to be relevant because it practically doesn't exist. I guess python just happily expands it's integers when it needs more memory space. So in general there is no limit.

Now, if you're talking about packing or storing integers in a safe way where they can later be retrieved with integrity then of course that is relevant. I'm really not sure about packing but I know python's pickle module handles those things well. String representations obviously have no practical limit.

So really, the bottom line is: what is your applications limit? What does it require for numeric data? Use that limit instead of python's fairly nonexistent integer limit.

How do I calculate square root in Python?

You have to write: sqrt = x**(1/2.0), otherwise an integer division is performed and the expression 1/2 returns 0.

This behavior is "normal" in Python 2.x, whereas in Python 3.x 1/2 evaluates to 0.5. If you want your Python 2.x code to behave like 3.x w.r.t. division write from __future__ import division - then 1/2 will evaluate to 0.5 and for backwards compatibility, 1//2 will evaluate to 0.

And for the record, the preferred way to calculate a square root is this:

import math
math.sqrt(x)

Align a div to center

This has always worked for me.

Provided you set a fixed width for your DIV, and the proper DOCTYPE, try this

div {        
  margin-left:auto;
  margin-right:auto;
}

Hope this helps.

Javascript: How to loop through ALL DOM elements on a page?

Andy E. gave a good answer.

I would add, if you feel to select all the childs in some special selector (this need happened to me recently), you can apply the method "getElementsByTagName()" on any DOM object you want.

For an example, I needed to just parse "visual" part of the web page, so I just made this

var visualDomElts = document.body.getElementsByTagName('*');

This will never take in consideration the head part.

How to output a multiline string in Bash?

Use the -e argument and the escape character \n:

echo -e "This will generate a next line \nThis new line is the result"

codes for ADD,EDIT,DELETE,SEARCH in vb2010

A good resource start off point would be MSDN as your looking into a microsoft product

System.BadImageFormatException An attempt was made to load a program with an incorrect format

I was having problems with a new install of VS with an x64 project - for Visual Studio 2013, Visual Studio 2015 and Visual Studio 2017:

Tools
  -> Options
   -> Projects and Solutions
    -> Web Projects
     -> Check "Use the 64 bit version of IIS Express for web sites and projects"

Conda: Installing / upgrading directly from github

I found a reference to this in condas issues. The following should now work.

name: sample_env
channels:
dependencies:
   - requests
   - bokeh>=0.10.0
   - pip:
     - git+https://github.com/pythonforfacebook/facebook-sdk.git

cell format round and display 2 decimal places

Another way is to use FIXED function, you can specify the number of decimal places but it defaults to 2 if the places aren't specified, i.e.

=FIXED(E5,2)

or just

=FIXED(E5)

Simple java program of pyramid

You can try in this way.

   for(int a=5;a>0;a--){
        int b=0;
       for(b=0;b<a;b++){
           System.out.print(" ");
       }
        for (int j=b;j<5;j++){
            System.out.print(" $ ");
        }
        System.out.println("");

    }

Out put

      $ 
     $  $ 
    $  $  $ 
   $  $  $  $

How to clone an InputStream?

Below is the solution with Kotlin.

You can copy your InputStream into ByteArray

val inputStream = ...

val byteOutputStream = ByteArrayOutputStream()
inputStream.use { input ->
    byteOutputStream.use { output ->
        input.copyTo(output)
    }
}

val byteInputStream = ByteArrayInputStream(byteOutputStream.toByteArray())

If you need to read the byteInputStream multiple times, call byteInputStream.reset() before reading again.

https://code.luasoftware.com/tutorials/kotlin/how-to-clone-inputstream/

How to use an output parameter in Java?

You can either use:

return X. this will return only one value.
return object. will return a full object. For example your object might include X, Y, and Z values.
pass array. arrays are passed by reference. i.e. if you pass array of integers, modified the array inside the method, then the original code will see the changes.

Example on passing Array.

void methodOne{
    int [] arr = {1,2,3};
    methodTwo(arr);
    ...//print arr here
}
void methodTwo(int [] arr){
    for (int i=0; i<arr.length;i++){
         arr[i]+=3;
    }
}

This will print out: 4,5,6.

Construct pandas DataFrame from list of tuples of (row,col,values)

I submit that it is better to leave your data stacked as it is:

df = pandas.DataFrame(data, columns=['R_Number', 'C_Number', 'Avg', 'Std'])

# Possibly also this if these can always be the indexes:
# df = df.set_index(['R_Number', 'C_Number'])

Then it's a bit more intuitive to say

df.set_index(['R_Number', 'C_Number']).Avg.unstack(level=1)

This way it is implicit that you're seeking to reshape the averages, or the standard deviations. Whereas, just using pivot, it's purely based on column convention as to what semantic entity it is that you are reshaping.

Python: How to get values of an array at certain index positions?

Just index using you ind_pos

ind_pos = [1,5,7]
print (a[ind_pos]) 
[88 85 16]


In [55]: a = [0,88,26,3,48,85,65,16,97,83,91]

In [56]: import numpy as np

In [57]: arr = np.array(a)

In [58]: ind_pos = [1,5,7]

In [59]: arr[ind_pos]
Out[59]: array([88, 85, 16])

How can I compare two time strings in the format HH:MM:SS?

Date.parse('01/01/2011 10:20:45') > Date.parse('01/01/2011 5:10:10')
> true

The 1st January is an arbitrary date, doesn't mean anything.

Unsupported operand type(s) for +: 'int' and 'str'

You're trying to concatenate a string and an integer, which is incorrect.

Change print(numlist.pop(2)+" has been removed") to any of these:

Explicit int to str conversion:

print(str(numlist.pop(2)) + " has been removed")

Use , instead of +:

print(numlist.pop(2), "has been removed")

String formatting:

print("{} has been removed".format(numlist.pop(2)))

jQuery UI Tabs - How to Get Currently Selected Tab Index

the easiest way of doing this is

$("#tabs div[aria-hidden='false']");

and for index

$("#tabs div[aria-hidden='false']").index();

Add a prefix string to beginning of each line

SETLOCAL ENABLEDELAYEDEXPANSION

YourPrefix=blabla

YourPath=C:\path

for /f "tokens=*" %%a in (!YourPath!\longfile.csv)     do (echo !YourPrefix!%%a) >> !YourPath!\Archive\output.csv

pgadmin4 : postgresql application server could not be contacted.

Deleting the contents of C:\Users\%USERNAME%\AppData\Roaming\pgAdmin directory worked for me!

Using Environment Variables with Vue.js

This is how I edited my vue.config.js so that I could expose NODE_ENV to the frontend (I'm using Vue-CLI):

vue.config.js

const webpack = require('webpack');

// options: https://github.com/vuejs/vue-cli/blob/dev/docs/config.md
module.exports = {
    // default baseUrl of '/' won't resolve properly when app js is being served from non-root location
    baseUrl: './',
    outputDir: 'dist',
    configureWebpack: {
        plugins: [
            new webpack.DefinePlugin({
                // allow access to process.env from within the vue app
                'process.env': {
                    NODE_ENV: JSON.stringify(process.env.NODE_ENV)
                }
            })
        ]
    }
};

VB.NET Connection string (Web.Config, App.Config)

Public Function connectDB() As OleDbConnection

        Dim Con As New OleDbConnection
        'Con.ConnectionString = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=" & DBNAME & ";Data Source=" & DBSERVER & ";Pwd=" & DBPWD & ""
        Con.ConnectionString = "Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=DBNAME;Data Source=DBSERVER-TOSH;User ID=Sa;Pwd= & DBPWD"
        Try
            Con.Open()
        Catch ex As Exception
            showMessage(ex)
        End Try
        Return Con
    End Function

Send POST request using NSURLSession

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

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

How to read a file into vector in C++?

Just to expand on juanchopanza's answer a bit...

for (int i=0; i=((Main.size())-1); i++) {
    cout << Main[i] << '\n';
}

does this:

Create i and set it to 0.
Set i to Main.size() - 1. Since Main is empty, Main.size() is 0, and i gets set to -1.
Main[-1] is an out-of-bounds access. Kaboom.

Programs & Examples On #Puid

Genymotion, "Unable to load VirtualBox engine." on Mavericks. VBox is setup correctly

AND/OR in Python?

How to Call VBA Function from Excel Cells?

How to apply multiple transforms in CSS?

Is it possible to change the content HTML5 alert messages?

How to get all selected values from <select multiple=multiple>?

How to convert signed to unsigned integer in python

Turning Sonar off for certain code

How to work on UAC when installing XAMPP

Missing `server' JVM (Java\jre7\bin\server\jvm.dll.)

Converting double to integer in Java

Why is pydot unable to find GraphViz's executables in Windows 8?

Get a list of distinct values in List

Loop until a specific user input

Understanding typedefs for function pointers in C

Java SSLException: hostname in certificate didn't match

Get selected value in dropdown list using JavaScript

What is the best way to return different types of ResponseEntity in Spring MVC or Spring-Boot

jQuery position DIV fixed at top on scroll

Return value in a Bash function

Functional, Declarative, and Imperative Programming

React Native: How to select the next TextInput after pressing the "next" keyboard button?

Common MySQL fields and their appropriate data types

SVN Commit failed, access forbidden

Conditional formatting, entire row based

How to display my application's errors in JSF?

AngularJS ng-click stopPropagation

how to console.log result of this ajax call?

JavaScript CSS how to add and remove multiple CSS classes to an element

Get class name of object as string in Swift

Should we @Override an interface's method implementation?

Center Oversized Image in Div

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

Windows command to convert Unix line endings?

Redirect stdout to a file in Python?

Converting a float to a string without rounding it

How do I align views at the bottom of the screen?

Get string between two strings in a string

Difference between innerText, innerHTML and value?

Disable resizing of a Windows Forms form

openssl s_client using a proxy

Convert timestamp to date in Oracle SQL

How to replace NaNs by preceding values in pandas DataFrame?

If hasClass then addClass to parent

What is difference between functional and imperative programming languages?

Uploading an Excel sheet and importing the data into SQL Server database

Convert digits into words with JavaScript

Validate that text field is numeric usiung jQuery

How do I register a .NET DLL file in the GAC?

Format a number as 2.5K if a thousand or more, otherwise 900

How can I force clients to refresh JavaScript files?

CSS pseudo elements in React

How to get current local date and time in Kotlin

If strings starts with in PowerShell

How to check for palindrome using Python logic

How to create bitmap from byte array?

Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)

How to remove new line characters from a string?

How can compare-and-swap be used for a wait-free mutual exclusion for any shared data structure?

Location of WSDL.exe

How to validate IP address in Python?

How do you remove all the options of a select box and then add one option and select it with jQuery?

unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING error

Return outside function error in Python

Laravel Mail::send() sending to multiple to or bcc addresses

Retrieving a List from a java.util.stream.Stream in Java 8

Node.js project naming conventions for files & folders

How do I solve the "server DNS address could not be found" error on Windows 10?

What is the best way to extract the first word from a string in Java?

Check whether an array is empty

'was not declared in this scope' error

How to configure SSL certificates with Charles Web Proxy and the latest Android Emulator on Windows?

How to get Activity's content view?

C# Call a method in a new thread

Which JDK version (Language Level) is required for Android Studio?

Answer Clarification - Android Studio supports JDK8

Java 8 update (3/19/14)

Another Update: Android added Java 7 support

Remove all special characters from a string in R?