Programs & Examples On #Visual studio express

Microsoft Visual Studio Express is a set of freeware integrated development environments (IDE) developed by Microsoft that are lightweight versions of the Microsoft Visual Studio product line.

What reference do I need to use Microsoft.Office.Interop.Excel in .NET?

Just had this problem myself and accepted answer didn't help me but I solved it with:

Add reference > Browse > C: > Windows > assembly > GAC > Microsoft.Office.Interop.Excel > 12.0.0.0_etc > Microsoft.Office.Interop.Excel.dll

how to display toolbox on the left side of window of Visual Studio Express for windows phone 7 development?

Sometimes you can just do 'Window -> Reset Window Layout', and that'll work :)

How to compile a 64-bit application using Visual C++ 2010 Express?

And make sure you download the Windows7.1 SDK, not just the Windows 7 one. That caused me a lot of head pounding.

How do I get the serial key for Visual Studio Express?

The question is about VS 2008 Express.

Microsoft's web page for registering Visual Studio 2008 Express has been dead (404) for some time, so registering it is not possible.

Instead, as a workaround, you can temporarily remove the requirement to register VS2008Exp by deleting (or renaming) the registry key:

HKEY_CURRENT_USER/Software/Microsoft/VCExpress/9.0/Registration

To ensure that this is working beforehand, click Help -> register product within VS2008.

You should see text like

"You have not yet registered your copy of Visual C++ 2008 Express Edition. This product will run for 10 more days before you will be required to register it."

Close the application, delete that key, reopen, click help->register product.

The text should now say

"You have not yet registered your copy of Visual C++ 2008 Express Edition. This product will run for 30 more days before you will be required to register it."

So you have two options - delete that key manually every 30 days, or run it from a batch file that also contains a line like:

reg delete HKCU\Software\Microsoft\VCExpress\9.0\Registration /f

[Edit: User @i486 confirms on testing that this workaround works even after the expiration period has expired]

[Edit2: User @Wyatt8740 has a much more elegant way to prevent the value from reappearing.]

Found conflicts between different versions of the same dependent assembly that could not be resolved

I could solve this installing Newtonsoft Json in the web project with nugget packages

How to store array or multiple values in one column

Well, there is an array type in recent Postgres versions (not 100% about PG 7.4). You can even index them, using a GIN or GIST index. The syntaxes are:

create table foo (
  bar  int[] default '{}'
);

select * from foo where bar && array[1] -- equivalent to bar && '{1}'::int[]

create index on foo using gin (bar); -- allows to use an index in the above query

But as the prior answer suggests, it will be better to normalize properly.

JavaScript function to add X months to a date

Just to add on to the accepted answer and the comments.

var x = 12; //or whatever offset
var CurrentDate = new Date();

//For the very rare cases like the end of a month
//eg. May 30th - 3 months will give you March instead of February
var date = CurrentDate.getDate();
CurrentDate.setDate(1);
CurrentDate.setMonth(CurrentDate.getMonth()+X);
CurrentDate.setDate(date);

Python list sort in descending order

Since your list is already in ascending order, we can simply reverse the list.

>>> timestamps.reverse()
>>> timestamps
['2010-04-20 10:25:38', 
'2010-04-20 10:12:13', 
'2010-04-20 10:12:13', 
'2010-04-20 10:11:50', 
'2010-04-20 10:10:58', 
'2010-04-20 10:10:37', 
'2010-04-20 10:09:46', 
'2010-04-20 10:08:22',
'2010-04-20 10:08:22', 
'2010-04-20 10:07:52', 
'2010-04-20 10:07:38', 
'2010-04-20 10:07:30']

Using AES encryption in C#

Using AES or implementing AES? To use AES, there is the System.Security.Cryptography.RijndaelManaged class.

Get child Node of another Node, given node name

If the Node is not just any node, but actually an Element (it could also be e.g. an attribute or a text node), you can cast it to Element and use getElementsByTagName.

Android - Adding at least one Activity with an ACTION-VIEW intent-filter after Updating SDK version 23

You can remove the warning by adding the below code in <intent-filter> inside <activity>

<action android:name="android.intent.action.VIEW" />

Calling the base class constructor from the derived class constructor

The base-class constructor is already automatically called by your derived-class constructor. In C++, if the base class has a default constructor (takes no arguments, can be auto-generated by the compiler!), and the derived-class constructor does not invoke another base-class constructor in its initialisation list, the default constructor will be called. I.e. your code is equivalent to:

class PetStore: public Farm
{
public :
    PetStore()
    : Farm()     // <---- Call base-class constructor in initialision list
    {
     idF=0;
    };
private:
    int idF;
    string nameF;
}

Putting a password to a user in PhpMyAdmin in Wamp

Search your installation of PhpMyAdmin for a file called Documentation.txt. This describes how to create a file called config.inc.php and how you can configure the username and password.

Get the latest date from grouped MySQL data

Are you looking for the max date for each model?

SELECT model, max(date) FROM doc
GROUP BY model

If you're looking for all models matching the max date of the entire table...

SELECT model, date FROM doc
WHERE date IN (SELECT max(date) FROM doc)

[--- Added ---]

For those who want to display details from every record matching the latest date within each model group (not summary data, as asked for in the OP):

SELECT d.model, d.date, d.color, d.etc FROM doc d
WHERE d.date IN (SELECT max(d2.date) FROM doc d2 WHERE d2.model=d.model)

MySQL 8.0 and newer supports the OVER clause, producing the same results a bit faster for larger data sets.

SELECT model, date, color, etc FROM (SELECT model, date, color, etc, 
  max(date) OVER (PARTITION BY model) max_date FROM doc) predoc 
WHERE date=max_date;

What does the 'export' command do?

export in sh and related shells (such as bash), marks an environment variable to be exported to child-processes, so that the child inherits them.

export is defined in POSIX:

The shell shall give the export attribute to the variables corresponding to the specified names, which shall cause them to be in the environment of subsequently executed commands. If the name of a variable is followed by = word, then the value of that variable shall be set to word.

How many bits is a "word"?

I'm not familiar with either of these books, but the second is closer to current reality. The first may be discussing a specific processor.

Processors have been made with quite a variety of word sizes, not always a multiple of 8.

The 8086 and 8087 processors used 16 bit words, and it's likely this is the machine the first author was writing about.

More recent processors commonly use 32 or 64 bit words.

In the 50's and 60's there were machines with words sizes that seem quite strange to us now, such as 4, 9 and 36. Since about the 70's word size has commonly been a power of 2 and a multiple of 8.

fetch from origin with deleted remote branches?

You need to do the following

git fetch -p

This will update the local database of remote branches.

Joining pandas dataframes by column names

you can use the left_on and right_on options as follows:

pd.merge(frame_1, frame_2, left_on='county_ID', right_on='countyid')

I was not sure from the question if you only wanted to merge if the key was in the left hand dataframe. If that is the case then the following will do that (the above will in effect do a many to many merge)

pd.merge(frame_1, frame_2, how='left', left_on='county_ID', right_on='countyid')

Why are elementwise additions much faster in separate loops than in a combined loop?

I cannot replicate the results discussed here.

I don't know if poor benchmark code is to blame, or what, but the two methods are within 10% of each other on my machine using the following code, and one loop is usually just slightly faster than two - as you'd expect.

Array sizes ranged from 2^16 to 2^24, using eight loops. I was careful to initialize the source arrays so the += assignment wasn't asking the FPU to add memory garbage interpreted as a double.

I played around with various schemes, such as putting the assignment of b[j], d[j] to InitToZero[j] inside the loops, and also with using += b[j] = 1 and += d[j] = 1, and I got fairly consistent results.

As you might expect, initializing b and d inside the loop using InitToZero[j] gave the combined approach an advantage, as they were done back-to-back before the assignments to a and c, but still within 10%. Go figure.

Hardware is Dell XPS 8500 with generation 3 Core i7 @ 3.4 GHz and 8 GB memory. For 2^16 to 2^24, using eight loops, the cumulative time was 44.987 and 40.965 respectively. Visual C++ 2010, fully optimized.

PS: I changed the loops to count down to zero, and the combined method was marginally faster. Scratching my head. Note the new array sizing and loop counts.

// MemBufferMystery.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <cmath>
#include <string>
#include <time.h>

#define  dbl    double
#define  MAX_ARRAY_SZ    262145    //16777216    // AKA (2^24)
#define  STEP_SZ           1024    //   65536    // AKA (2^16)

int _tmain(int argc, _TCHAR* argv[]) {
    long i, j, ArraySz = 0,  LoopKnt = 1024;
    time_t start, Cumulative_Combined = 0, Cumulative_Separate = 0;
    dbl *a = NULL, *b = NULL, *c = NULL, *d = NULL, *InitToOnes = NULL;

    a = (dbl *)calloc( MAX_ARRAY_SZ, sizeof(dbl));
    b = (dbl *)calloc( MAX_ARRAY_SZ, sizeof(dbl));
    c = (dbl *)calloc( MAX_ARRAY_SZ, sizeof(dbl));
    d = (dbl *)calloc( MAX_ARRAY_SZ, sizeof(dbl));
    InitToOnes = (dbl *)calloc( MAX_ARRAY_SZ, sizeof(dbl));
    // Initialize array to 1.0 second.
    for(j = 0; j< MAX_ARRAY_SZ; j++) {
        InitToOnes[j] = 1.0;
    }

    // Increase size of arrays and time
    for(ArraySz = STEP_SZ; ArraySz<MAX_ARRAY_SZ; ArraySz += STEP_SZ) {
        a = (dbl *)realloc(a, ArraySz * sizeof(dbl));
        b = (dbl *)realloc(b, ArraySz * sizeof(dbl));
        c = (dbl *)realloc(c, ArraySz * sizeof(dbl));
        d = (dbl *)realloc(d, ArraySz * sizeof(dbl));
        // Outside the timing loop, initialize
        // b and d arrays to 1.0 sec for consistent += performance.
        memcpy((void *)b, (void *)InitToOnes, ArraySz * sizeof(dbl));
        memcpy((void *)d, (void *)InitToOnes, ArraySz * sizeof(dbl));

        start = clock();
        for(i = LoopKnt; i; i--) {
            for(j = ArraySz; j; j--) {
                a[j] += b[j];
                c[j] += d[j];
            }
        }
        Cumulative_Combined += (clock()-start);
        printf("\n %6i miliseconds for combined array sizes %i and %i loops",
                (int)(clock()-start), ArraySz, LoopKnt);
        start = clock();
        for(i = LoopKnt; i; i--) {
            for(j = ArraySz; j; j--) {
                a[j] += b[j];
            }
            for(j = ArraySz; j; j--) {
                c[j] += d[j];
            }
        }
        Cumulative_Separate += (clock()-start);
        printf("\n %6i miliseconds for separate array sizes %i and %i loops \n",
                (int)(clock()-start), ArraySz, LoopKnt);
    }
    printf("\n Cumulative combined array processing took %10.3f seconds",
            (dbl)(Cumulative_Combined/(dbl)CLOCKS_PER_SEC));
    printf("\n Cumulative seperate array processing took %10.3f seconds",
        (dbl)(Cumulative_Separate/(dbl)CLOCKS_PER_SEC));
    getchar();

    free(a); free(b); free(c); free(d); free(InitToOnes);
    return 0;
}

I'm not sure why it was decided that MFLOPS was a relevant metric. I though the idea was to focus on memory accesses, so I tried to minimize the amount of floating point computation time. I left in the +=, but I am not sure why.

A straight assignment with no computation would be a cleaner test of memory access time and would create a test that is uniform irrespective of the loop count. Maybe I missed something in the conversation, but it is worth thinking twice about. If the plus is left out of the assignment, the cumulative time is almost identical at 31 seconds each.

HTML button to NOT submit form

For accessibility reason, I could not pull it off with multiple type=submit buttons. The only way to work natively with a form with multiple buttons but ONLY one can submit the form when hitting the Enter key is to ensure that only one of them is of type=submit while others are in other type such as type=button. By this way, you can benefit from the better user experience in dealing with a form on a browser in terms of keyboard support.

Extract first item of each sublist

lst = [['a','b','c'], [1,2,3], ['x','y','z']]
outputlist = []
for values in lst:
    outputlist.append(values[0])

print(outputlist) 

Output: ['a', 1, 'x']

How to tell if a file is git tracked (by shell exit code)?

I suggest a custom alias on you .gitconfig.

You have to way to do:

1) With git command:

git config --global alias.check-file <command>

2) Editing ~/.gitconfig and add this line on alias section:

[alias]
    check-file = "!f() { if [ $# -eq 0 ]; then echo 'Filename missing!'; else tracked=$(git ls-files ${1}); if [[ -z ${tracked} ]]; then echo 'File not tracked'; else echo 'File tracked'; fi; fi;  };  f"

Once launched command (1) or saved file (2), on your workspace you can test it:

$ git check-file
$ Filename missing 

$ git check-file README.md
$ File tracked 

$ git check-file foo
$ File not tracked

How to a convert a date to a number and back again in MATLAB

Use DATESTR

>> datestr(40189)
ans =
12-Jan-0110

Unfortunately, Excel starts counting at 1-Jan-1900. Find out how to convert serial dates from Matlab to Excel by using DATENUM

>> datenum(2010,1,11)
ans =
      734149
>> datenum(2010,1,11)-40189
ans =
      693960
>> datestr(40189+693960)
ans =
11-Jan-2010

In other words, to convert any serial Excel date, call

datestr(excelSerialDate + 693960)

EDIT

To get the date in mm/dd/yyyy format, call datestr with the specified format

excelSerialDate = 40189;
datestr(excelSerialDate + 693960,'mm/dd/yyyy')
ans =
01/11/2010

Also, if you want to get rid of the leading zero for the month, you can use REGEXPREP to fix things

excelSerialDate = 40189;
regexprep(datestr(excelSerialDate + 693960,'mm/dd/yyyy'),'^0','')
ans =
1/11/2010

Phone Number Validation MVC

Try for simple regular expression for Mobile No

[Required (ErrorMessage="Required")]
[RegularExpression(@"^(\d{10})$", ErrorMessage = "Wrong mobile")]
public string Mobile { get; set; }

How to remove carriage returns and new lines in Postgresql?

OP asked specifically about regexes since it would appear there's concern for a number of other characters as well as newlines, but for those just wanting strip out newlines, you don't even need to go to a regex. You can simply do:

select replace(field,E'\n','');

I think this is an SQL-standard behavior, so it should extend back to all but perhaps the very earliest versions of Postgres. The above tested fine for me in 9.4 and 9.2

Java URL encoding of query string parameters

URLEncoder is the way to go. You only need to keep in mind to encode only the individual query string parameter name and/or value, not the entire URL, for sure not the query string parameter separator character & nor the parameter name-value separator character =.

String q = "random word £500 bank $";
String url = "https://example.com?q=" + URLEncoder.encode(q, StandardCharsets.UTF_8);

When you're still not on Java 10 or newer, then use StandardCharsets.UTF_8.toString() as charset argument, or when you're still not on Java 7 or newer, then use "UTF-8".


Note that spaces in query parameters are represented by +, not %20, which is legitimately valid. The %20 is usually to be used to represent spaces in URI itself (the part before the URI-query string separator character ?), not in query string (the part after ?).

Also note that there are three encode() methods. One without Charset as second argument and another with String as second argument which throws a checked exception. The one without Charset argument is deprecated. Never use it and always specify the Charset argument. The javadoc even explicitly recommends to use the UTF-8 encoding, as mandated by RFC3986 and W3C.

All other characters are unsafe and are first converted into one or more bytes using some encoding scheme. Then each byte is represented by the 3-character string "%xy", where xy is the two-digit hexadecimal representation of the byte. The recommended encoding scheme to use is UTF-8. However, for compatibility reasons, if an encoding is not specified, then the default encoding of the platform is used.

See also:

Dependency injection with Jersey 2.0

Oracle recommends to add the @Path annotation to all types to be injected when combining JAX-RS with CDI: http://docs.oracle.com/javaee/7/tutorial/jaxrs-advanced004.htm Though this is far from perfect (e.g. you will get warning from Jersey on startup), I decided to take this route, which saves me from maintaining all supported types within a binder.

Example:

@Singleton
@Path("singleton-configuration-service")
public class ConfigurationService {
  .. 
}

@Path("my-path")
class MyProvider {
  @Inject ConfigurationService _configuration;

  @GET
  public Object get() {..}
}

How can I mimic the bottom sheet from the Maps app?

I released a library based on my answer below.

It mimics the Shortcuts application overlay. See this article for details.

The main component of the library is the OverlayContainerViewController. It defines an area where a view controller can be dragged up and down, hiding or revealing the content underneath it.

let contentController = MapsViewController()
let overlayController = SearchViewController()

let containerController = OverlayContainerViewController()
containerController.delegate = self
containerController.viewControllers = [
    contentController,
    overlayController
]

window?.rootViewController = containerController

Implement OverlayContainerViewControllerDelegate to specify the number of notches wished:

enum OverlayNotch: Int, CaseIterable {
    case minimum, medium, maximum
}

func numberOfNotches(in containerViewController: OverlayContainerViewController) -> Int {
    return OverlayNotch.allCases.count
}

func overlayContainerViewController(_ containerViewController: OverlayContainerViewController,
                                    heightForNotchAt index: Int,
                                    availableSpace: CGFloat) -> CGFloat {
    switch OverlayNotch.allCases[index] {
        case .maximum:
            return availableSpace * 3 / 4
        case .medium:
            return availableSpace / 2
        case .minimum:
            return availableSpace * 1 / 4
    }
}

SwiftUI (12/29/20)

A SwiftUI version of the library is now available.

Color.red.dynamicOverlay(Color.green)

Previous answer

I think there is a significant point that is not treated in the suggested solutions: the transition between the scroll and the translation.

Maps transition between the scroll and the translation

In Maps, as you may have noticed, when the tableView reaches contentOffset.y == 0, the bottom sheet either slides up or goes down.

The point is tricky because we can not simply enable/disable the scroll when our pan gesture begins the translation. It would stop the scroll until a new touch begins. This is the case in most of the proposed solutions here.

Here is my try to implement this motion.

Starting point: Maps App

To start our investigation, let's visualize the view hierarchy of Maps (start Maps on a simulator and select Debug > Attach to process by PID or Name > Maps in Xcode 9).

Maps debug view hierarchy

It doesn't tell how the motion works, but it helped me to understand the logic of it. You can play with the lldb and the view hierarchy debugger.

Our view controller stacks

Let's create a basic version of the Maps ViewController architecture.

We start with a BackgroundViewController (our map view):

class BackgroundViewController: UIViewController {
    override func loadView() {
        view = MKMapView()
    }
}

We put the tableView in a dedicated UIViewController:

class OverlayViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    lazy var tableView = UITableView()

    override func loadView() {
        view = tableView
        tableView.dataSource = self
        tableView.delegate = self
    }

    [...]
}

Now, we need a VC to embed the overlay and manage its translation. To simplify the problem, we consider that it can translate the overlay from one static point OverlayPosition.maximum to another OverlayPosition.minimum.

For now it only has one public method to animate the position change and it has a transparent view:

enum OverlayPosition {
    case maximum, minimum
}

class OverlayContainerViewController: UIViewController {

    let overlayViewController: OverlayViewController
    var translatedViewHeightContraint = ...

    override func loadView() {
        view = UIView()
    }

    func moveOverlay(to position: OverlayPosition) {
        [...]
    }
}

Finally we need a ViewController to embed the all:

class StackViewController: UIViewController {

    private var viewControllers: [UIViewController]

    override func viewDidLoad() {
        super.viewDidLoad()
        viewControllers.forEach { gz_addChild($0, in: view) }
    }
}

In our AppDelegate, our startup sequence looks like:

let overlay = OverlayViewController()
let containerViewController = OverlayContainerViewController(overlayViewController: overlay)
let backgroundViewController = BackgroundViewController()
window?.rootViewController = StackViewController(viewControllers: [backgroundViewController, containerViewController])

The difficulty behind the overlay translation

Now, how to translate our overlay?

Most of the proposed solutions use a dedicated pan gesture recognizer, but we actually already have one : the pan gesture of the table view. Moreover, we need to keep the scroll and the translation synchronised and the UIScrollViewDelegate has all the events we need!

A naive implementation would use a second pan Gesture and try to reset the contentOffset of the table view when the translation occurs:

func panGestureAction(_ recognizer: UIPanGestureRecognizer) {
    if isTranslating {
        tableView.contentOffset = .zero
    }
}

But it does not work. The tableView updates its contentOffset when its own pan gesture recognizer action triggers or when its displayLink callback is called. There is no chance that our recognizer triggers right after those to successfully override the contentOffset. Our only chance is either to take part of the layout phase (by overriding layoutSubviews of the scroll view calls at each frame of the scroll view) or to respond to the didScroll method of the delegate called each time the contentOffset is modified. Let's try this one.

The translation Implementation

We add a delegate to our OverlayVC to dispatch the scrollview's events to our translation handler, the OverlayContainerViewController :

protocol OverlayViewControllerDelegate: class {
    func scrollViewDidScroll(_ scrollView: UIScrollView)
    func scrollViewDidStopScrolling(_ scrollView: UIScrollView)
}

class OverlayViewController: UIViewController {

    [...]

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        delegate?.scrollViewDidScroll(scrollView)
    }

    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        delegate?.scrollViewDidStopScrolling(scrollView)
    }
}

In our container, we keep track of the translation using a enum:

enum OverlayInFlightPosition {
    case minimum
    case maximum
    case progressing
}

The current position calculation looks like :

private var overlayInFlightPosition: OverlayInFlightPosition {
    let height = translatedViewHeightContraint.constant
    if height == maximumHeight {
        return .maximum
    } else if height == minimumHeight {
        return .minimum
    } else {
        return .progressing
    }
}

We need 3 methods to handle the translation:

The first one tells us if we need to start the translation.

private func shouldTranslateView(following scrollView: UIScrollView) -> Bool {
    guard scrollView.isTracking else { return false }
    let offset = scrollView.contentOffset.y
    switch overlayInFlightPosition {
    case .maximum:
        return offset < 0
    case .minimum:
        return offset > 0
    case .progressing:
        return true
    }
}

The second one performs the translation. It uses the translation(in:) method of the scrollView's pan gesture.

private func translateView(following scrollView: UIScrollView) {
    scrollView.contentOffset = .zero
    let translation = translatedViewTargetHeight - scrollView.panGestureRecognizer.translation(in: view).y
    translatedViewHeightContraint.constant = max(
        Constant.minimumHeight,
        min(translation, Constant.maximumHeight)
    )
}

The third one animates the end of the translation when the user releases its finger. We calculate the position using the velocity & the current position of the view.

private func animateTranslationEnd() {
    let position: OverlayPosition =  // ... calculation based on the current overlay position & velocity
    moveOverlay(to: position)
}

Our overlay's delegate implementation simply looks like :

class OverlayContainerViewController: UIViewController {

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        guard shouldTranslateView(following: scrollView) else { return }
        translateView(following: scrollView)
    }

    func scrollViewDidStopScrolling(_ scrollView: UIScrollView) {
        // prevent scroll animation when the translation animation ends
        scrollView.isEnabled = false
        scrollView.isEnabled = true
        animateTranslationEnd()
    }
}

Final problem: dispatching the overlay container's touches

The translation is now pretty efficient. But there is still a final problem: the touches are not delivered to our background view. They are all intercepted by the overlay container's view. We can not set isUserInteractionEnabled to false because it would also disable the interaction in our table view. The solution is the one used massively in the Maps app, PassThroughView:

class PassThroughView: UIView {
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let view = super.hitTest(point, with: event)
        if view == self {
            return nil
        }
        return view
    }
}

It removes itself from the responder chain.

In OverlayContainerViewController:

override func loadView() {
    view = PassThroughView()
}

Result

Here is the result:

Result

You can find the code here.

Please if you see any bugs, let me know ! Note that your implementation can of course use a second pan gesture, specially if you add a header in your overlay.

Update 23/08/18

We can replace scrollViewDidEndDragging with willEndScrollingWithVelocity rather than enabling/disabling the scroll when the user ends dragging:

func scrollView(_ scrollView: UIScrollView,
                willEndScrollingWithVelocity velocity: CGPoint,
                targetContentOffset: UnsafeMutablePointer<CGPoint>) {
    switch overlayInFlightPosition {
    case .maximum:
        break
    case .minimum, .progressing:
        targetContentOffset.pointee = .zero
    }
    animateTranslationEnd(following: scrollView)
}

We can use a spring animation and allow user interaction while animating to make the motion flow better:

func moveOverlay(to position: OverlayPosition,
                 duration: TimeInterval,
                 velocity: CGPoint) {
    overlayPosition = position
    translatedViewHeightContraint.constant = translatedViewTargetHeight
    UIView.animate(
        withDuration: duration,
        delay: 0,
        usingSpringWithDamping: velocity.y == 0 ? 1 : 0.6,
        initialSpringVelocity: abs(velocity.y),
        options: [.allowUserInteraction],
        animations: {
            self.view.layoutIfNeeded()
    }, completion: nil)
}

Intellij JAVA_HOME variable

The problem is your "Project SDK" is none! Add a "Project SDK" by clicking "New ..." and choose the path of JDK. And then it should be OK.

Get a worksheet name using Excel VBA

Sub FnGetSheetsName()

    Dim mainworkBook As Workbook

    Set mainworkBook = ActiveWorkbook

    For i = 1 To mainworkBook.Sheets.Count

    'Either we can put all names in an array , here we are printing all the names in Sheet 2

    mainworkBook.Sheets("Sheet2").Range("A" & i) = mainworkBook.Sheets(i).Name

    Next i

End Sub

Install opencv for Python 3.3

For Ubuntu - pip3 install opencv-python sudo apt-get install python3-opencv

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

read is your friend:

  • If string is in a variable:

    string="word1 word2"
    read -r first _ <<< "$string"
    printf '%s\n' "$first"
    
  • If you're working in a pipe: first case: you only want the first word of the first line:

    printf '%s\n' "word1 word2" "line2" | { read -r first _; printf '%s\n' "$first"; }
    

    second case: you want the first word of each line:

    printf '%s\n' "word1 word2" "worda wordb" | while read -r first _; do printf '%s\n' "$first"; done
    

These work if there are leading spaces:

printf '%s\n' "   word1 word2" | { read -r first _; printf '%s\n' "$first"; }

Access-Control-Allow-Origin Multiple Origin Domains?

Only a single origin can be specified for the Access-Control-Allow-Origin header. But you can set the origin in your response according to the request. Also don't forget to set the Vary header. In PHP I would do the following:

    /**
     * Enable CORS for the passed origins.
     * Adds the Access-Control-Allow-Origin header to the response with the origin that matched the one in the request.
     * @param array $origins
     * @return string|null returns the matched origin or null
     */
    function allowOrigins($origins)
    {
        $val = $_SERVER['HTTP_ORIGIN'] ?? null;
        if (in_array($val, $origins, true)) {
            header('Access-Control-Allow-Origin: '.$val);
            header('Vary: Origin');

            return $val;
        }

        return null;
    }

  if (allowOrigins(['http://localhost', 'https://localhost'])) {
      echo your response here, e.g. token
  }

Is it possible to animate scrollTop with jQuery?

the cross browser code is:

$(window).scrollTop(300); 

it is without animation but works everywhere

Javascript Image Resize

You don't have to do it with Javascript. You can just create a CSS class and apply it to your tag.

.preview_image{
        width: 300px;
    height: auto;
    border: 0px;
}

How to replace a string in multiple files in linux command line

Given you want to search for the string search and replace it with replace across multiple files, this is my battle-tested, one-line formula:

grep -RiIl 'search' | xargs sed -i 's/search/replace/g'

Quick grep explanation:

  • -R - recursive search
  • -i - case-insensitive
  • -I - skip binary files (you want text, right?)
  • -l - print a simple list as output. Needed for the other commands

The grep output is then piped to sed (through xargs) which is used to actually replace text. The -i flag will alter the file directly. Remove it for a kind of "dry run" mode.

Converting a UNIX Timestamp to Formatted Date String

It is very important to set a default timezone to get the correct result

<?php
// set default timezone
date_default_timezone_set('Europe/Berlin');

// timestamp
$timestamp = 1307595105;

// output
echo date('d M Y H:i:s Z',$timestamp);
echo date('c',$timestamp);
?> 

Online conversion help: http://freeonlinetools24.com/timestamp

Remove all child elements of a DOM node in JavaScript

The currently accepted answer is wrong about innerHTML being slower (at least in IE and Chrome), as m93a correctly mentioned.

Chrome and FF are dramatically faster using this method (which will destroy attached jquery data):

var cNode = node.cloneNode(false);
node.parentNode.replaceChild(cNode, node);

in a distant second for FF and Chrome, and fastest in IE:

node.innerHTML = '';

InnerHTML won't destroy your event handlers or break jquery references, it's also recommended as a solution here: https://developer.mozilla.org/en-US/docs/Web/API/Element.innerHTML.

The fastest DOM manipulation method (still slower than the previous two) is the Range removal, but ranges aren't supported until IE9.

var range = document.createRange();
range.selectNodeContents(node);
range.deleteContents();

The other methods mentioned seem to be comparable, but a lot slower than innerHTML, except for the outlier, jquery (1.1.1 and 3.1.1), which is considerably slower than anything else:

$(node).empty();

Evidence here:

http://jsperf.com/innerhtml-vs-removechild/167 http://jsperf.com/innerhtml-vs-removechild/300 https://jsperf.com/remove-all-child-elements-of-a-dom-node-in-javascript (New url for jsperf reboot because editing the old url isn't working)

Jsperf's "per-test-loop" often gets understood as "per-iteration", and only the first iteration has nodes to remove so the results are meaningless, at time of posting there were tests in this thread set up incorrectly.

Oracle 11g Express Edition for Windows 64bit?

This is a very useful question. It has 5 different helpful answers that say quite different but complementary things (surprising, eh?). This answer combines those answers into a more useful form as well as adding two more solutions.

There is no Oracle Express Edition for 64 bit Windows. See this official [but unanswered] forum thread. Therefore, these are the classes of solutions:

  • Pay. The paid versions of Oracle (Standard/Enterprise) support 64-bit Windows.
  • Hack. Many people have successfully installed the 32 bit Oracle XE software on 64 bit Windows. This blog post seems to be the one most often cited as helpful. This is unsupported, of course, and session trace is known to fail. But for many folks this is a good solution.
  • VM. If your goal is simply to run Oracle on a 64 bit Windows machine, then running Oracle in a Virtual Machine may be a good solution. VirtualBox is a natural choice because it's free and Oracle provides pre-configured VMs with Oracle DB installed. VMWare or other virtualization systems work equally well.
  • Develop only. Many users want Oracle XE just to learn Oracle or to test an application with Oracle. If that's your requirement, then Oracle Enterprise Edition (including support for 64-bit Windows) is free "only for the purpose of developing, testing, prototyping and demonstrating your application".

SelectedValue vs SelectedItem.Value of DropDownList

In droupDown list there are two item add property.

1) Text 2) value

If you want to get text property then u use selecteditem.text

and If you want to select value property then use selectedvalue property

In your case i thing both value and text property are the same so no matter if u use selectedvalue or selecteditem.text

If both are different then they give us different results

Global variables in header file

You should not define global variables in header files. You can declare them as extern in header file and define them in a .c source file.

(Note: In C, int i; is a tentative definition, it allocates storage for the variable (= is a definition) if there is no other definition found for that variable in the translation unit.)

Which passwordchar shows a black dot (•) in a winforms textbox?

Below are some different ways to achieve this. Pick the one suits you

  1. In fonts like 'Tahoma' and 'Times new Roman' this common password character '?' which is called 'Black circle' has a unicode value 0x25CF. Set the PasswordChar property with either the value 0x25CF or copy paste the actual character itself.

  2. If you want to display the Black Circle by default then enable visual styles which should replace the default password character from '*' to '?' by default irrespective of the font.

  3. Another alternative is to use 'Wingdings 2' font on the TextBox and set the password character to 0x97. This should work even if the application is not unicoded. Refer to charMap.exe to get better idea on different fonts and characters supported.

Service Temporarily Unavailable Magento?

You need to follow these steps:

  1. Go to magento root directory via cPanel/FTP
  2. In case of Magento1, you will find maintenance.flag and delete it
  3. In case of Magento2, delete var/maintenance.flag

.NET HttpClient. How to POST string value?

You could do something like this

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://localhost:6740/api/Membership/exist");

req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";         
req.ContentLength = 6;

StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
streamOut.Write(strRequest);
streamOut.Close();
StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
string strResponse = streamIn.ReadToEnd();
streamIn.Close();

And then strReponse should contain the values returned by your webservice

How to deserialize JS date using Jackson?

This works for me - i am using jackson 2.0.4

ObjectMapper objectMapper = new ObjectMapper();
final DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
objectMapper.setDateFormat(df);

Use '=' or LIKE to compare strings in SQL?

In my small experience:

"=" for Exact Matches.

"LIKE" for Partial Matches.

What is the difference between Scala's case class and class?

Nobody mentioned that case class companion object has tupled defention, which has a type:

case class Person(name: String, age: Int)
//Person.tupled is def tupled: ((String, Int)) => Person

The only use case I can find is when you need to construct case class from tuple, example:

val bobAsTuple = ("bob", 14)
val bob = (Person.apply _).tupled(bobAsTuple) //bob: Person = Person(bob,14)

You can do the same, without tupled, by creating object directly, but if your datasets expressed as list of tuple with arity 20(tuple with 20 elements), may be using tupled is your choise.

How to disable the parent form when a child form is active?

Why not just have the parent wait for the child to close. This is more than you need.

// Execute child process
System.Diagnostics.Process proc = 
    System.Diagnostics.Process.Start("notepad.exe");
proc.WaitForExit();

SQL: how to select a single id ("row") that meets multiple criteria from a single column

First way: JOIN:

get people with multiple countries:

SELECT u1.user_id 
FROM users u1
JOIN users u2
on u1.user_id  = u2.user_id 
AND u1.ancestry <> u2.ancestry

Get people from 2 specific countries:

SELECT u1.user_id 
FROM users u1
JOIN users u2
on u1.user_id  = u2.user_id 
WHERE u1.ancestry = 'Germany'
AND u2.ancestry = 'France'

For 3 countries... join three times. To only get the result(s) once, distinct.

Second way: GROUP BY

This will get users which have 3 lines (having...count) and then you specify which lines are permitted. Note that if you don't have a UNIQUE KEY on (user_id, ancestry), a user with 'id, england' that appears 3 times will also match... so it depends on your table structure and/or data.

SELECT user_id 
FROM users u1
WHERE ancestry = 'Germany'
OR ancestry = 'France'
OR ancestry = 'England'
GROUP BY user_id
HAVING count(DISTINCT ancestry) = 3

How do I update Anaconda?

On Mac, open a terminal and run the following two commands.

conda update conda
conda update anaconda

Make sure to run each command multiple times to update to the current version.

Java string split with "." (dot)

You need to escape the dot if you want to split on a literal dot:

String extensionRemoved = filename.split("\\.")[0];

Otherwise you are splitting on the regex ., which means "any character".
Note the double backslash needed to create a single backslash in the regex.


You're getting an ArrayIndexOutOfBoundsException because your input string is just a dot, ie ".", which is an edge case that produces an empty array when split on dot; split(regex) removes all trailing blanks from the result, but since splitting a dot on a dot leaves only two blanks, after trailing blanks are removed you're left with an empty array.

To avoid getting an ArrayIndexOutOfBoundsException for this edge case, use the overloaded version of split(regex, limit), which has a second parameter that is the size limit for the resulting array. When limit is negative, the behaviour of removing trailing blanks from the resulting array is disabled:

".".split("\\.", -1) // returns an array of two blanks, ie ["", ""]

ie, when filename is just a dot ".", calling filename.split("\\.", -1)[0] will return a blank, but calling filename.split("\\.")[0] will throw an ArrayIndexOutOfBoundsException.

Fatal error: Maximum execution time of 30 seconds exceeded in C:\xampp\htdocs\wordpress\wp-includes\class-http.php on line 1610

Please

  1. locate the file [XAMPP Installation Directory]\php\php.ini (e.g. C:\xampp\php\php.ini)
  2. open php.ini in Notepad or any Text editor
  3. locate the line containing max_execution_time and
  4. increase the value from 30 to some larger number (e.g. set: max_execution_time = 90)
  5. then restart Apache web server from the XAMPP control panel

If there will still be the same error after that, try to increase the value for the max_execution_time further more.

Xcode 6 Bug: Unknown class in Interface Builder file

Check if your class has right Target Membership.

Javascript call() & apply() vs bind()?

The basic difference between Call, Apply and Bind are:

Bind will be used if you want your execution context to come later in the picture.

Ex:

var car = { 
  registrationNumber: "007",
  brand: "Mercedes",

  displayDetails: function(ownerName){
    console.log(ownerName + ' this is your car ' + '' + this.registrationNumber + " " + this.brand);
  }
}
car.displayDetails('Nishant'); // **Nishant this is your car 007 Mercedes**

Let's say i want use this method in some other variable

var car1 = car.displayDetails('Nishant');
car1(); // undefined

To use the reference of car in some other variable you should use

var car1 = car.displayDetails.bind(car, 'Nishant');
car1(); // Nishant this is your car 007 Mercedes

Let's talk about more extensive use of bind function

var func = function() {
 console.log(this)
}.bind(1);

func();
// Number: 1

Why? Because now func is bind with Number 1, if we don't use bind in that case it will point to Global Object.

var func = function() {
 console.log(this)
}.bind({});

func();
// Object

Call, Apply are used when you want to execute the statement at the same time.

var Name = { 
    work: "SSE",
    age: "25"
}

function displayDetails(ownerName) {
    console.log(ownerName + ", this is your name: " + 'age' + this.age + " " + 'work' + this.work);
}
displayDetails.call(Name, 'Nishant')
// Nishant, this is your name: age25 workSSE

// In apply we pass an array of arguments
displayDetails.apply(Name, ['Nishant'])
// Nishant, this is your name: age25 workSSE

Connecting client to server using Socket.io

Have you tried loading the socket.io script not from a relative URL?

You're using:

<script src="socket.io/socket.io.js"></script>

And:

socket.connect('http://127.0.0.1:8080');

You should try:

<script src="http://localhost:8080/socket.io/socket.io.js"></script>

And:

socket.connect('http://localhost:8080');

Switch localhost:8080 with whatever fits your current setup.

Also, depending on your setup, you may have some issues communicating to the server when loading the client page from a different domain (same-origin policy). This can be overcome in different ways (outside of the scope of this answer, google/SO it).

SOAP-ERROR: Parsing WSDL: Couldn't load from - but works on WAMP

It may be helpful for someone, although there is no precise answer to this question.

My soap url has a non-standard port(9087 for example), and firewall blocked that request and I took each time this error:

ERROR - 2017-12-19 20:44:11 --> Fatal Error - SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://soalurl.test:9087/orawsv?wsdl' : failed to load external entity "http://soalurl.test:9087/orawsv?wsdl"

I allowed port in firewall and solved the error!

React - How to force a function component to render?

Official FAQ ( https://reactjs.org/docs/hooks-faq.html#is-there-something-like-forceupdate ) now recommends this way if you really need to do it:

  const [ignored, forceUpdate] = useReducer(x => x + 1, 0);

  function handleClick() {
    forceUpdate();
  }

How to set 'X-Frame-Options' on iframe?

If you are following xml approach, then below code will work.

    <security:headers>
        <security:frame-options />
        <security:cache-control />
        <security:content-type-options />
        <security:xss-protection />
    </security:headers>
<security:http>

boundingRectWithSize for NSAttributedString returning wrong size

Swift four version

let string = "A great test string."
let font = UIFont.systemFont(ofSize: 14)
let attributes: [NSAttributedStringKey: Any] = [.font: font]
let attributedString = NSAttributedString(string: string, attributes: attributes)
let largestSize = CGSize(width: bounds.width, height: .greatestFiniteMagnitude)

//Option one (best option)
let framesetter = CTFramesetterCreateWithAttributedString(attributedString)
let textSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRange(), nil, largestSize, nil)

//Option two
let textSize = (string as NSString).boundingRect(with: largestSize, options: [.usesLineFragmentOrigin , .usesFontLeading], attributes: attributes, context: nil).size

//Option three
let textSize = attributedString.boundingRect(with: largestSize, options: [.usesLineFragmentOrigin , .usesFontLeading], context: nil).size

Measuring the text with the CTFramesetter works best as it provides integer sizes and handles emoji's and other unicode characters well.

Telegram Bot - how to get a group chat id?

My second Solution for the error {"ok":true,"result":[]}

  1. Go in your Telegram Group
  2. Add new User (Invite)
  3. Search for "getidsbot" => @getidsbot
  4. Message: /start@getidsbot
  5. Now you see the ID. looks like 1068773197, which is -1001068773197 for bots (with -100 prefix)!!!
  6. Kick the bot from the Group.
  7. Now go to the Webbrowser an send this line (Test Message):
https://api.telegram.org/botAPITOKENNUMBER:APITOKENKEYHERE/sendmessage?chat_id=-100GROUPNUMBER&text=test

Edit the API Token and the Group-ID!

Find all special characters in a column in SQL Server 2008

select count(*) from dbo.tablename where address_line_1 LIKE '%[\'']%' {eSCAPE'\'}

Git: Merge a Remote branch locally

You can reference those remote tracking branches ~(listed with git branch -r) with the name of their remote.

You need to fetch the remote branch:

git fetch origin aRemoteBranch

If you want to merge one of those remote branches on your local branch:

git checkout master
git merge origin/aRemoteBranch

Note 1: For a large repo with a long history, you will want to add the --depth=1 option when you use git fetch.

Note 2: These commands also work with other remote repos so you can setup an origin and an upstream if you are working on a fork.

Note 3: user3265569 suggests the following alias in the comments:

From aLocalBranch, run git combine remoteBranch
Alias:

combine = !git fetch origin ${1} && git merge origin/${1}

Opposite scenario: If you want to merge one of your local branch on a remote branch (as opposed to a remote branch to a local one, as shown above), you need to create a new local branch on top of said remote branch first:

git checkout -b myBranch origin/aBranch
git merge anotherLocalBranch

The idea here, is to merge "one of your local branch" (here anotherLocalBranch) to a remote branch (origin/aBranch).
For that, you create first "myBranch" as representing that remote branch: that is the git checkout -b myBranch origin/aBranch part.
And then you can merge anotherLocalBranch to it (to myBranch).

Matplotlib make tick labels font size smaller

Please note that newer versions of MPL have a shortcut for this task. An example is shown in the other answer to this question: https://stackoverflow.com/a/11386056/42346

The code below is for illustrative purposes and may not necessarily be optimized.

import matplotlib.pyplot as plt
import numpy as np

def xticklabels_example():
    fig = plt.figure() 

    x = np.arange(20)
    y1 = np.cos(x)
    y2 = (x**2)
    y3 = (x**3)
    yn = (y1,y2,y3)
    COLORS = ('b','g','k')

    for i,y in enumerate(yn):
        ax = fig.add_subplot(len(yn),1,i+1)

        ax.plot(x, y, ls='solid', color=COLORS[i]) 

        if i != len(yn) - 1:
            # all but last 
            ax.set_xticklabels( () )
        else:
            for tick in ax.xaxis.get_major_ticks():
                tick.label.set_fontsize(14) 
                # specify integer or one of preset strings, e.g.
                #tick.label.set_fontsize('x-small') 
                tick.label.set_rotation('vertical')

    fig.suptitle('Matplotlib xticklabels Example')
    plt.show()

if __name__ == '__main__':
    xticklabels_example()

enter image description here

git: Switch branch and ignore any changes without committing

None of these answers helped me because I still had untracked files even after reset and stash. I had to do:

git reset --hard HEAD
git clean -d -f

Converting map to struct

The simplest way would be to use https://github.com/mitchellh/mapstructure

import "github.com/mitchellh/mapstructure"

mapstructure.Decode(myData, &result)

If you want to do it yourself, you could do something like this:

http://play.golang.org/p/tN8mxT_V9h

func SetField(obj interface{}, name string, value interface{}) error {
    structValue := reflect.ValueOf(obj).Elem()
    structFieldValue := structValue.FieldByName(name)

    if !structFieldValue.IsValid() {
        return fmt.Errorf("No such field: %s in obj", name)
    }

    if !structFieldValue.CanSet() {
        return fmt.Errorf("Cannot set %s field value", name)
    }

    structFieldType := structFieldValue.Type()
    val := reflect.ValueOf(value)
    if structFieldType != val.Type() {
        return errors.New("Provided value type didn't match obj field type")
    }

    structFieldValue.Set(val)
    return nil
}

type MyStruct struct {
    Name string
    Age  int64
}

func (s *MyStruct) FillStruct(m map[string]interface{}) error {
    for k, v := range m {
        err := SetField(s, k, v)
        if err != nil {
            return err
        }
    }
    return nil
}

func main() {
    myData := make(map[string]interface{})
    myData["Name"] = "Tony"
    myData["Age"] = int64(23)

    result := &MyStruct{}
    err := result.FillStruct(myData)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Println(result)
}

How to make a div fill a remaining horizontal space?

I have been working on this problem for two days and have a solution that may work for you and anyone else trying to make a responsive Fixed width left and have the right side fill in the remainder of the screen without wrapping around the left side. The intention I assume is to make the page responsive in browsers as well as mobile devices.

Here is the Code

_x000D_
_x000D_
// Fix the width of the right side to cover the screen when resized_x000D_
$thePageRefreshed = true;_x000D_
// The delay time below is needed to insure that the resize happens after the window resize event fires_x000D_
// In addition the show() helps.  Without this delay the right div may go off screen when browser is refreshed _x000D_
setTimeout(function(){_x000D_
    fixRightSideWidth();_x000D_
    $('.right_content_container').show(600);_x000D_
}, 50);_x000D_
_x000D_
// Capture the window resize event (only fires when you resize the browser)._x000D_
$( window ).resize(function() {_x000D_
    fixRightSideWidth();_x000D_
});_x000D_
_x000D_
function fixRightSideWidth(){_x000D_
    $blockWrap = 300; // Point at which you allow the right div to drop below the top div_x000D_
    $normalRightResize = $( window ).width() - $('.left_navigator_items').width() - 20; // The -20 forces the right block to fall below the left_x000D_
    if( ($normalRightResize >= $blockWrap) || $thePageRefreshed == true ){_x000D_
        $('.right_content_container').width( $normalRightResize );_x000D_
        $('.right_content_container').css("padding-left","0px");_x000D_
        _x000D_
        /* Begin test lines these can be deleted */_x000D_
        $rightrightPosition = $('.right_content_container').css("right");_x000D_
        $rightleftPosition = $('.right_content_container').css("left");_x000D_
        $rightwidthPosition = $('.right_content_container').css("width");_x000D_
        $(".top_title").html('window width: '+$( window ).width()+"&nbsp;"+'width: '+$rightwidthPosition+"&nbsp;"+'right: '+$rightrightPosition);_x000D_
        /* End test lines these can be deleted */_x000D_
    _x000D_
    _x000D_
    }_x000D_
    else{_x000D_
        if( $('.right_content_container').width() > 300 ){_x000D_
            $('.right_content_container').width(300);_x000D_
        }_x000D_
        _x000D_
        /* Begin test lines these can be deleted */_x000D_
        $rightrightPosition = $('.right_content_container').css("right");_x000D_
        $rightleftPosition = $('.right_content_container').css("left");_x000D_
        $rightwidthPosition = $('.right_content_container').css("width");_x000D_
        $(".top_title").html('window width: '+$( window ).width()+"&nbsp;"+'width: '+$rightwidthPosition+"&nbsp;"+'right: '+$rightrightPosition);_x000D_
        /* End test lines these can be deleted */_x000D_
    _x000D_
    }_x000D_
    if( $thePageRefreshed == true ){_x000D_
        $thePageRefreshed = false;_x000D_
    }_x000D_
}
_x000D_
/* NOTE: The html and body settings are needed for full functionality_x000D_
and they are ignored by jsfiddle so create this exapmle on your web site_x000D_
*/_x000D_
html {_x000D_
    min-width: 310px;_x000D_
    background: #333;_x000D_
    min-height:100vh;_x000D_
}_x000D_
_x000D_
body{_x000D_
 background: #333;_x000D_
 background-color: #333;_x000D_
 color: white;_x000D_
    min-height:100vh;_x000D_
}_x000D_
_x000D_
.top_title{_x000D_
  background-color: blue;_x000D_
  text-align: center;_x000D_
}_x000D_
_x000D_
.bottom_content{_x000D_
 border: 0px;_x000D_
 height: 100%;_x000D_
}_x000D_
_x000D_
.left_right_container * {_x000D_
    position: relative;_x000D_
    margin: 0px;_x000D_
    padding: 0px;_x000D_
    background: #333 !important;_x000D_
    background-color: #333 !important;_x000D_
    display:inline-block;_x000D_
    text-shadow: none;_x000D_
    text-transform: none;_x000D_
    letter-spacing: normal;_x000D_
    font-size: 14px;_x000D_
    font-weight: 400;_x000D_
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;_x000D_
    border-radius: 0;_x000D_
    box-sizing: content-box;_x000D_
    transition: none;_x000D_
}_x000D_
_x000D_
.left_navigator_item{_x000D_
 display:inline-block;_x000D_
 margin-right: 5px;_x000D_
 margin-bottom: 0px !important;_x000D_
 width: 100%;_x000D_
 min-height: 20px !important;_x000D_
 text-align:center !important;_x000D_
 margin: 0px;_x000D_
 padding-top: 3px;_x000D_
 padding-bottom: 3px;_x000D_
 vertical-align: top;_x000D_
}_x000D_
_x000D_
.left_navigator_items {_x000D_
    float: left;_x000D_
    width: 150px;_x000D_
}_x000D_
_x000D_
.right_content_container{_x000D_
    float: right;_x000D_
    overflow: visible!important;_x000D_
    width:95%; /* width don't matter jqoery overwrites on refresh */_x000D_
    display:none;_x000D_
    right:0px;_x000D_
}_x000D_
_x000D_
.span_text{_x000D_
 background: #eee !important;_x000D_
 background-color: #eee !important;_x000D_
 color: black !important;_x000D_
 padding: 5px;_x000D_
 margin: 0px;_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>_x000D_
<div class="top_title">Test Title</div>_x000D_
<div class="bottom_content">_x000D_
    <div class="left_right_container">_x000D_
        <div class="left_navigator_items">_x000D_
            <div class="left_navigator_item">Dashboard</div>_x000D_
            <div class="left_navigator_item">Calendar</div>_x000D_
            <div class="left_navigator_item">Calendar Validator</div>_x000D_
            <div class="left_navigator_item">Bulletin Board Slide Editor</div>_x000D_
            <div class="left_navigator_item">Bulletin Board Slide Show (Live)</div>_x000D_
            <div class="left_navigator_item">TV Guide</div>_x000D_
        </div>_x000D_
        <div class="right_content_container">_x000D_
            <div class="span_text">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam ullamcorper maximus tellus a commodo. Fusce posuere at nisi in venenatis. Sed posuere dui sapien, sit amet facilisis purus maximus sit amet. Proin luctus lectus nec rutrum accumsan. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Ut fermentum lectus consectetur sapien tempus molestie. Donec bibendum pulvinar purus, ac aliquet est commodo sit amet. Duis vel euismod mauris, eu congue ex. In vel arcu vel sem lobortis posuere. Cras in nisi nec urna blandit porta at et nunc. Morbi laoreet consectetur odio ultricies ullamcorper. Suspendisse potenti. Nulla facilisi._x000D_
_x000D_
Quisque cursus lobortis molestie. Aliquam ut scelerisque leo. Integer sed sodales lectus, eget varius odio. Nullam nec dapibus lorem. Aenean a mattis velit, ut porta nunc. Phasellus aliquam volutpat molestie. Aliquam tristique purus neque, vitae interdum ante aliquam ut._x000D_
_x000D_
Pellentesque quis finibus velit. Fusce ac pulvinar est, in placerat sem. Suspendisse nec nunc id nunc vestibulum hendrerit. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Mauris id lectus dapibus, tempor nunc non, bibendum nisl. Proin euismod, erat nec aliquet mollis, erat metus convallis nulla, eu tincidunt eros erat a lectus. Vivamus sed mattis neque. In vitae pellentesque mauris. Ut aliquet auctor vulputate. Duis eleifend tincidunt gravida. Sed tincidunt blandit tempor._x000D_
_x000D_
Duis pharetra, elit id aliquam placerat, nunc arcu interdum neque, ac luctus odio felis vitae magna. Curabitur commodo finibus suscipit. Maecenas ut risus eget nisl vehicula feugiat. Sed sed bibendum justo. Curabitur in laoreet dolor. Suspendisse eget ligula ac neque ullamcorper blandit. Phasellus sit amet ultricies tellus._x000D_
_x000D_
In fringilla, augue sed fringilla accumsan, orci eros laoreet urna, vel aliquam ex nulla in eros. Quisque aliquet nisl et scelerisque vehicula. Curabitur facilisis, nisi non maximus facilisis, augue erat gravida nunc, in tempus massa diam id dolor. Suspendisse dapibus leo vel pretium ultrices. Sed finibus dolor est, sit amet pharetra quam dapibus fermentum. Ut nec risus pharetra, convallis nisl nec, tempor nisl. Vivamus sit amet quam quis dolor dapibus maximus. Suspendisse accumsan sagittis ligula, ut ultricies nisi feugiat pretium. Cras aliquam velit eu venenatis accumsan. Integer imperdiet, eros sit amet dignissim volutpat, tortor enim varius turpis, vel viverra ante mauris at felis. Mauris sed accumsan sapien. Interdum et malesuada fames ac ante ipsum primis in faucibus. Ut vel magna commodo, facilisis turpis eu, semper mi. Nulla massa risus, bibendum a magna molestie, gravida maximus nunc.</div>_x000D_
        </div>_x000D_
    </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Here is my fiddle that may just work for you as it did for me. https://jsfiddle.net/Larry_Robertson/62LLjapm/

Best way to check for nullable bool in a condition expression (if ...)

If you only want to test for true against null/false, One I've just used and reads quite well is

bool? someCondition = null
if (someCondition.Equals(true))
...

Why does multiplication repeats the number several times?

I think you're confused about types here. You'll only get that result if you're multiplying a string. Start the interpreter and try this:

>>> print "1" * 9
111111111
>>> print 1 * 9
9
>>> print int("1") * 9
9

So make sure the first operand is an integer (and not a string), and it will work.

How do I compute the intersection point of two lines?

Here is a solution using the Shapely library. Shapely is often used for GIS work, but is built to be useful for computational geometry. I changed your inputs from lists to tuples.

Problem

# Given these endpoints
#line 1
A = (X, Y)
B = (X, Y)

#line 2
C = (X, Y)
D = (X, Y)

# Compute this:
point_of_intersection = (X, Y)

Solution

import shapely
from shapely.geometry import LineString, Point

line1 = LineString([A, B])
line2 = LineString([C, D])

int_pt = line1.intersection(line2)
point_of_intersection = int_pt.x, int_pt.y

print(point_of_intersection)

Convert string to Date in java

String str_date="13-09-2011";
DateFormat formatter ; 
Date date ; 
formatter = new SimpleDateFormat("dd-MM-yyyy");
date = (Date)formatter.parse(str_date); 
System.out.println("Today is " +date.getTime());

Try this

Android notification is not showing

Actually the answer by ƒernando Valle doesn't seem to be correct. Then again, your question is overly vague because you fail to mention what is wrong or isn't working.

Looking at your code I am assuming the Notification simply isn't showing.

Your notification is not showing, because you didn't provide an icon. Even though the SDK documentation doesn't mention it being required, it is in fact very much so and your Notification will not show without one.

addAction is only available since 4.1. Prior to that you would use the PendingIntent to launch an Activity. You seem to specify a PendingIntent, so your problem lies elsewhere. Logically, one must conclude it's the missing icon.

Spring JPA @Query with LIKE

You Missed a colon(:) before the username parameter. therefore your code must change from:

@Query("select u from user u where u.username like '%username%'")

to :

@Query("select u from user u where u.username like '%:username%'")

"NoClassDefFoundError: Could not initialize class" error

Realised that I was using OpenJDK when I saw this error. Fixed it once I installed the Oracle JDK instead.

Docker Error bind: address already in use

I had the same problem. I fixed this by stopping the Apache2 service on my host.

Declaring a python function with an array parameters and passing an array argument to the function call?

Maybe you want unpack elements of array, I don't know if I got it, but below a example:

def my_func(*args):
    for a in args:
        print a

my_func(*[1,2,3,4])
my_list = ['a','b','c']
my_func(*my_list)

password-check directive in angularjs

To add to the large number of already existing solutions, this works well for me.

(Jan Laussmann answer stopped working with the latest AngularJS beta releases).

directive:

angular.module('myApp').directive('matchValidator', [function() {
        return {
            require: 'ngModel',
            link: function(scope, elm, attr, ctrl) {
                var pwdWidget = elm.inheritedData('$formController')[attr.matchValidator];

                ctrl.$parsers.push(function(value) {
                    if (value === pwdWidget.$viewValue) {
                        ctrl.$setValidity('match', true); 
                        return value;
                    }                       

                    if (value && pwdWidget.$viewValue) {
                        ctrl.$setValidity('match', false);
                    }

                });

                pwdWidget.$parsers.push(function(value) {
                    if (value && ctrl.$viewValue) {
                        ctrl.$setValidity('match', value === ctrl.$viewValue);
                    }
                    return value;
                });
            }
        };
    }])

usage

<input type="email" ng-model="value1" name="email" required>
<input type="email" ng-model="value2" name="emailConfirm" match-validator="email" required>

display error

<div ng-if="[[yourFormName]].emailConfirm.$error">
    <div ng-if="[[yourFormName]].emailConfirm.$error.match">
        Email addresses don't match.
    </div>
</div>

How to lookup JNDI resources on WebLogic?

I just had to update legacy Weblogic 8 app to use a data-source instead of hard-coded JDBC string. Datasource JNDI name on the configuration tab in the Weblogic admin showed: "weblogic.jdbc.ESdatasource", below are two ways that worked:

      Context ctx = new InitialContext();
      DataSource dataSource;

      try {
        dataSource = (DataSource) ctx.lookup("weblogic.jdbc.ESdatasource");
        response.getWriter().println("A " +dataSource);
      }catch(Exception e) {
        response.getWriter().println("A " + e.getMessage() + e.getCause());
      }

      //or

      try {
        dataSource = (DataSource) ctx.lookup("weblogic/jdbc/ESdatasource");
        response.getWriter().println("F "+dataSource);
      }catch(Exception e) {
        response.getWriter().println("F " + e.getMessage() + e.getCause());
      }

      //use your datasource
      conn = datasource.getConnection();

That's all folks. No passwords and initial context factory needed from the inside of Weblogic app.

Portable way to check if directory exists [Windows/Linux, C]

With C++17 you can use std::filesystem::is_directory function (https://en.cppreference.com/w/cpp/filesystem/is_directory). It accepts a std::filesystem::path object which can be constructed with a unicode path.

Get current NSDate in timestamp format

Can also use

@(time(nil)).stringValue);

for timestamp in seconds.

What is middleware exactly?

From my own experience with webwork, a middleware was stuff between users (the web browser) and the backend database. It was the software that took stuff that users put in (example: orders for iPads, did some magical business logic, i.e. check if there are enough iPads available to fill the order) and updated the backend database to reflect those changes.

How do I tell if a variable has a numeric value in Perl?

You can use Regular Expressions to determine if $foo is a number (or not).

Take a look here: How do I determine whether a scalar is a number

MySQL select query with multiple conditions

also you can use "AND" instead of "OR" if you want both attributes to be applied.

select * from tickets where (assigned_to='1') and (status='open') order by created_at desc;

Component based game engine design

Update 2013-01-07: If you want to see a good mix of component-based game engine with the (in my opinion) superior approach of reactive programming take a look at the V-Play engine. It very well integrates QTs QML property binding functionality.

We did some research on CBSE in games at our university and I collected some material over the years:

CBSE in games literature:

  • Game Engine Architecture
  • Game Programming Gems 4: A System for Managin Game Entities Game
  • Game Programming Gems 5: Component Based Object Management
  • Game Programming Gems 5: A Generic Component Library
  • Game Programming Gems 6: Game Object Component System
  • Object-Oriented Game Development
  • Architektur des Kerns einer Game-Engine und Implementierung mit Java (german)

A very good and clean example of a component-based game-engine in C# is the Elephant game framework.

If you really want to know what components are read: Component-based Software Engineering! They define a component as:

A software component is a software element that conforms to a component model and can be independently deployed and composed without modification according to a composition standard.

A component model defines specific interaction and composition standards. A component model implementation is the dedicated set of executable software elements required to support the execution of components that conform to the model.

A software component infrastructure is a set of interacting software components designed to ensure that a software system or subsystem constructed using those components and interfaces will satisfy clearly defined performance specifications.

My opinions after 2 years of experience with CBSE in games thought are that object-oriented programming is simply a dead-end. Remember my warning as you watch your components become smaller and smaller, and more like functions packed in components with a lot of useless overhead. Use functional-reactive programming instead. Also take a look at my fresh blog post (which lead me to this question while writing it :)) about Why I switched from component-based game engine architecture to FRP.

CBSE in games papers:

CBSE in games web-links (sorted by relevancy):

How should I make my VBA code compatible with 64-bit Windows?

I've already encountered this problem on people using my in-house tools on new 64 bit machines with Office 2010.

all I had to do was change lines of code like this:

Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _
    (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long

To This:

#If VBA7 Then
    Private Declare PtrSafe Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _
        (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
#Else
    Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _
        (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
#End If

You will, of course want to make sure that the library you're using is available on both machines, but so far nothing I've used has been a problem.

Note that in the old VB6, PtrSafe isn't even a valid command, so it'll appear in red as though you have a compile error, but it won't actually ever give an error because the compiler will skip the first part of the if block.

code Appearance

Applications using the above code compile and run perfectly on Office 2003, 2007, and 2010 32 and 64 bit.

When should you use a class vs a struct in C++?

All class members are private by default and all struct members are public by default. Class has default private bases and Struct has default public bases. Struct in case of C cannot have member functions where as in case of C++ we can have member functions being added to the struct. Other than these differences, I don't find anything surprising about them.

How to add Tomcat Server in eclipse

There are different eclipse plugins available to manage Tomcat server and create war file.

For example you can use tomcatPlugin. It permits to start/stop and build the war simply. You can read this tutorial.

How to set the timezone in Django?

I found this question looking to change the timezone in my Django project's settings.py file to the United Kingdom.

Using the tz database in jfs' solution I found the answer:

    TIME_ZONE = 'Europe/London'

How can I make a .NET Windows Forms application that only runs in the System Tray?

As mat1t says - you need to add a NotifyIcon to your application and then use something like the following code to set the tooltip and context menu:

this.notifyIcon.Text = "This is the tooltip";
this.notifyIcon.ContextMenu = new ContextMenu();
this.notifyIcon.ContextMenu.MenuItems.Add(new MenuItem("Option 1", new EventHandler(handler_method)));

This code shows the icon in the system tray only:

this.notifyIcon.Visible = true;  // Shows the notify icon in the system tray

The following will be needed if you have a form (for whatever reason):

this.ShowInTaskbar = false;  // Removes the application from the taskbar
Hide();

The right click to get the context menu is handled automatically, but if you want to do some action on a left click you'll need to add a Click handler:

    private void notifyIcon_Click(object sender, EventArgs e)
    {
        var eventArgs = e as MouseEventArgs;
        switch (eventArgs.Button)
        {
            // Left click to reactivate
            case MouseButtons.Left:
                // Do your stuff
                break;
        }
    }

Request UAC elevation from within a Python script?

It seems there's no way to elevate the application privileges for a while for you to perform a particular task. Windows needs to know at the start of the program whether the application requires certain privileges, and will ask the user to confirm when the application performs any tasks that need those privileges. There are two ways to do this:

  1. Write a manifest file that tells Windows the application might require some privileges
  2. Run the application with elevated privileges from inside another program

This two articles explain in much more detail how this works.

What I'd do, if you don't want to write a nasty ctypes wrapper for the CreateElevatedProcess API, is use the ShellExecuteEx trick explained in the Code Project article (Pywin32 comes with a wrapper for ShellExecute). How? Something like this:

When your program starts, it checks if it has Administrator privileges, if it doesn't it runs itself using the ShellExecute trick and exits immediately, if it does, it performs the task at hand.

As you describe your program as a "script", I suppose that's enough for your needs.

Cheers.

Regular expression containing one word or another

You just missed an extra pair of brackets for the "OR" symbol. The following should do the trick:

([0-9]+)\s+((\bseconds\b)|(\bminutes\b))

Without those you were either matching a number followed by seconds OR just the word minutes

How do I iterate through children elements of a div using jQuery?

$('#myDiv').children().each( (index, element) => {
    console.log(index);     // children's index
    console.log(element);   // children's element
 });

This iterates through all the children and their element with index value can be accessed separately using element and index respectively.

Throwing multiple exceptions in a method of an interface in java

You need to specify it on the methods that can throw the exceptions. You just seperate them with a ',' if it can throw more than 1 type of exception. e.g.

public interface MyInterface {
  public MyObject find(int x) throws MyExceptionA,MyExceptionB;
}

How to run functions in parallel?

If you are a windows user and using python 3, then this post will help you to do parallel programming in python.when you run a usual multiprocessing library's pool programming, you will get an error regarding the main function in your program. This is because the fact that windows has no fork() functionality. The below post is giving a solution to the mentioned problem .

http://python.6.x6.nabble.com/Multiprocessing-Pool-woes-td5047050.html

Since I was using the python 3, I changed the program a little like this:

from types import FunctionType
import marshal

def _applicable(*args, **kwargs):
  name = kwargs['__pw_name']
  code = marshal.loads(kwargs['__pw_code'])
  gbls = globals() #gbls = marshal.loads(kwargs['__pw_gbls'])
  defs = marshal.loads(kwargs['__pw_defs'])
  clsr = marshal.loads(kwargs['__pw_clsr'])
  fdct = marshal.loads(kwargs['__pw_fdct'])
  func = FunctionType(code, gbls, name, defs, clsr)
  func.fdct = fdct
  del kwargs['__pw_name']
  del kwargs['__pw_code']
  del kwargs['__pw_defs']
  del kwargs['__pw_clsr']
  del kwargs['__pw_fdct']
  return func(*args, **kwargs)

def make_applicable(f, *args, **kwargs):
  if not isinstance(f, FunctionType): raise ValueError('argument must be a function')
  kwargs['__pw_name'] = f.__name__  # edited
  kwargs['__pw_code'] = marshal.dumps(f.__code__)   # edited
  kwargs['__pw_defs'] = marshal.dumps(f.__defaults__)  # edited
  kwargs['__pw_clsr'] = marshal.dumps(f.__closure__)  # edited
  kwargs['__pw_fdct'] = marshal.dumps(f.__dict__)   # edited
  return _applicable, args, kwargs

def _mappable(x):
  x,name,code,defs,clsr,fdct = x
  code = marshal.loads(code)
  gbls = globals() #gbls = marshal.loads(gbls)
  defs = marshal.loads(defs)
  clsr = marshal.loads(clsr)
  fdct = marshal.loads(fdct)
  func = FunctionType(code, gbls, name, defs, clsr)
  func.fdct = fdct
  return func(x)

def make_mappable(f, iterable):
  if not isinstance(f, FunctionType): raise ValueError('argument must be a function')
  name = f.__name__    # edited
  code = marshal.dumps(f.__code__)   # edited
  defs = marshal.dumps(f.__defaults__)  # edited
  clsr = marshal.dumps(f.__closure__)  # edited
  fdct = marshal.dumps(f.__dict__)  # edited
  return _mappable, ((i,name,code,defs,clsr,fdct) for i in iterable)

After this function , the above problem code is also changed a little like this:

from multiprocessing import Pool
from poolable import make_applicable, make_mappable

def cube(x):
  return x**3

if __name__ == "__main__":
  pool    = Pool(processes=2)
  results = [pool.apply_async(*make_applicable(cube,x)) for x in range(1,7)]
  print([result.get(timeout=10) for result in results])

And I got the output as :

[1, 8, 27, 64, 125, 216]

I am thinking that this post may be useful for some of the windows users.

Mathematical functions in Swift

To use the math-functions you have to import Cocoa

You can see the other defined mathematical functions in the following way. Make a Cmd-Click on the function name sqrt and you enter the file with all other global math functions and constanst.

A small snippet of the file

...
func pow(_: CDouble, _: CDouble) -> CDouble

func sqrtf(_: CFloat) -> CFloat
func sqrt(_: CDouble) -> CDouble

func erff(_: CFloat) -> CFloat
...
var M_LN10: CDouble { get } /* loge(10)       */
var M_PI: CDouble { get } /* pi             */
var M_PI_2: CDouble { get } /* pi/2           */
var M_SQRT2: CDouble { get } /* sqrt(2)        */
...

case-insensitive matching in xpath?

One possible PHP solution:

// load XML to SimpleXML
$x = simplexml_load_string($xmlstr);

// index it by title once
$index = array();
foreach ($x->CD as &$cd) {
  $title = strtolower((string)$cd['title']); 
  if (!array_key_exists($title, $index)) $index[$title] = array();
  $index[$title][] = &$cd;
}

// query the index 
$result = $index[strtolower("EMPIRE BURLESQUE")];

Git is not working after macOS Update (xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

if you get Software Update server issue: enter image description here

use with sudo:

sudo xcode-select --install

What is mutex and semaphore in Java ? What is the main difference?

Semaphore:

A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each acquire() blocks if necessary until a permit is available, and then takes it. Each release() adds a permit, potentially releasing a blocking acquirer. However, no actual permit objects are used; the Semaphore just keeps a count of the number available and acts accordingly.

Semaphores are often used to restrict the number of threads than can access some (physical or logical) resource

Java does not have built-in Mutex API. But it can be implemented as binary semaphore.

A semaphore initialized to one, and which is used such that it only has at most one permit available, can serve as a mutual exclusion lock. This is more commonly known as a binary semaphore, because it only has two states: one permit available, or zero permits available.

When used in this way, the binary semaphore has the property (unlike many Lock implementations), that the "lock" can be released by a thread other than the owner (as semaphores have no notion of ownership). This can be useful in some specialized contexts, such as deadlock recovery.

So key differences between Semaphore and Mutex:

  1. Semaphore restrict number of threads to access a resource throuhg permits. Mutex allows only one thread to access resource.

  2. No threads owns Semaphore. Threads can update number of permits by calling acquire() and release() methods. Mutexes should be unlocked only by the thread holding the lock.

  3. When a mutex is used with condition variables, there is an implied bracketing—it is clear which part of the program is being protected. This is not necessarily the case for a semaphore, which might be called the go to of concurrent programming—it is powerful but too easy to use in an unstructured, indeterminate way.

How to position background image in bottom right corner? (CSS)

Voilà:

body {
   background-color: #000; /*Default bg, similar to the background's base color*/
   background-image: url("bg.png");
   background-position: right bottom; /*Positioning*/
   background-repeat: no-repeat; /*Prevent showing multiple background images*/
}

The background properties can be combined together, in one background property. See also: https://developer.mozilla.org/en/CSS/background-position

generating variable names on fly in python

bit long, it works i guess...

prices = [5, 12, 45]
names = []
for i, _ in enumerate(prices):
    names.append("price"+str(i+1))
dict = {}
for name, price in zip(names, prices):
    dict[name] = price
for item in dict:
    print(item, "=", dict[item])

In Python, how do I split a string and keep the separators?

# This keeps all separators  in result 
##########################################################################
import re
st="%%(c+dd+e+f-1523)%%7"
sh=re.compile('[\+\-//\*\<\>\%\(\)]')

def splitStringFull(sh, st):
   ls=sh.split(st)
   lo=[]
   start=0
   for l in ls:
     if not l : continue
     k=st.find(l)
     llen=len(l)
     if k> start:
       tmp= st[start:k]
       lo.append(tmp)
       lo.append(l)
       start = k + llen
     else:
       lo.append(l)
       start =llen
   return lo
  #############################

li= splitStringFull(sh , st)
['%%(', 'c', '+', 'dd', '+', 'e', '+', 'f', '-', '1523', ')%%', '7']

Can you control how an SVG's stroke-width is drawn?

I found an easy way, which has a few restrictions, but worked for me:

  • define the shape in defs
  • define a clip path referencing the shape
  • use it and double the stroke with as the outside is clipped

Here a working example:

_x000D_
_x000D_
<svg width="240" height="240" viewBox="0 0 1024 1024">_x000D_
<defs>_x000D_
 <path id="ld" d="M256,0 L0,512 L384,512 L128,1024 L1024,384 L640,384 L896,0 L256,0 Z"/>_x000D_
 <clipPath id="clip">_x000D_
  <use xlink:href="#ld"/>_x000D_
 </clipPath>_x000D_
</defs>_x000D_
<g>_x000D_
 <use xlink:href="#ld" stroke="#0081C6" stroke-width="160" fill="#00D2B8" clip-path="url(#clip)"/>_x000D_
</g>_x000D_
</svg>
_x000D_
_x000D_
_x000D_

Is it .yaml or .yml?

After reading a bunch of people's comments online about this, my first reaction was that this is basically one of those really unimportant debates. However, my initial interest was to find out the right format so I could be consistent with my file naming practice.

Long story short, the creator of YAML are saying .yaml, but personally I keep doing .yml. That just makes more sense to me. So I went on the journey to find affirmation and soon enough, I realise that docker uses .yml everywhere. I've been writing docker-compose.yml files all this time, while you keep seeing in kubernetes' docs kubectl apply -f *.yaml...

So, in conclusion, both formats are obviously accepted and if you are on the other end, (ie: writing systems that receive a YAML file as input) you should allow for both. That seems like another snake case versus camel case thingy...

Refresh certain row of UITableView based on Int in Swift

Swift 4

let indexPathRow:Int = 0    
let indexPosition = IndexPath(row: indexPathRow, section: 0)
tableView.reloadRows(at: [indexPosition], with: .none)

Initializing an Array of Structs in C#

Firstly, do you really have to have a mutable struct? They're almost always a bad idea. Likewise public fields. There are some very occasional contexts in which they're reasonable (usually both parts together, as with ValueTuple) but they're pretty rare in my experience.

Other than that, I'd just create a constructor taking the two bits of data:

class SomeClass
{

    struct MyStruct
    {
        private readonly string label;
        private readonly int id;

        public MyStruct (string label, int id)
        {
            this.label = label;
            this.id = id;
        }

        public string Label { get { return label; } }
        public string Id { get { return id; } }

    }

    static readonly IList<MyStruct> MyArray = new ReadOnlyCollection<MyStruct>
        (new[] {
             new MyStruct ("a", 1),
             new MyStruct ("b", 5),
             new MyStruct ("q", 29)
        });
}

Note the use of ReadOnlyCollection instead of exposing the array itself - this will make it immutable, avoiding the problem exposing arrays directly. (The code show does initialize an array of structs - it then just passes the reference to the constructor of ReadOnlyCollection<>.)

Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed

In my case, the problem was caused by some Response.Write commands at Master Page of the website (code behind). They were there only for debugging purposes (that's not the best way, I know)...

Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT

Had this issue several times. If you have a large DB and want to try avoiding backup/restore (with added missing table), try few times back and forth:

DROP TABLE my_table;

ALTER TABLE my_table DISCARD TABLESPACE;

-and-

rm my_table.ibd (orphan w/o corresponding my_table.frm) located in /var/lib/mysql/my_db/ directory

-and then-

CREATE TABLE IF NOT EXISTS my_table (...)

How to use Ajax.ActionLink?

Sure, a very similar question was asked before. Set the controller for ajax requests:

public ActionResult Show()
{
    if (Request.IsAjaxRequest()) 
    {
        return PartialView("Your_partial_view", new Model());
    }
    else 
    {
        return View();
    }
}

Set the action link as wanted:

@Ajax.ActionLink("Show", 
                 "Show", 
                 null, 
                 new AjaxOptions { HttpMethod = "GET", 
                 InsertionMode = InsertionMode.Replace, 
                 UpdateTargetId = "dialog_window_id", 
                 OnComplete = "your_js_function();" })

Note that I'm using Razor view engine, and that your AjaxOptions may vary depending on what you want. Finally display it on a modal window. The jQuery UI dialog is suggested.

Convert string to nullable type (int, double, etc...)

There is no way around this. Nullable, as well as your method, is constrained to using only value types as it's argument. String is a reference type and hence is incompatible with this declaration.

Why does PEP-8 specify a maximum line length of 79 characters?

Printing a monospaced font at default sizes is (on A4 paper) 80 columns by 66 lines.

How do I select between the 1st day of the current month and current day in MySQL?

All the responses here have been way too complex. You know that the first of the current month is the current date but with 01 as the date. You can just use YEAR() and MONTH() to build the month date by inputting the NOW() method. Here's the solution:

select * from table_name 
where date between CONCAT_WS('-', YEAR( NOW() ), MONTH( NOW() ), '01') and DATE( NOW() )

CONCAT_WS() joins a series of strings with a separator (a dash in this case). So if today is 2020-08-28, YEAR( NOW() ) = '2020' and MONTH( NOW() ) = '08' and then you just need to append '01' at the end.

Voila!

How do I compare two strings in Perl?

And if you'd like to extract the differences between the two strings, you can use String::Diff.

What does "The code generator has deoptimised the styling of [some file] as it exceeds the max of "100KB"" mean?

This seems to be a Babel error. I'm guessing you use babel-loader, and are not excluding external libraries from your loader test. As far as I can tell, the message is not harmful, but you should still do something like this:

loaders: [
    { test: /\.js$/, exclude: /node_modules/, loader: 'babel' }
]

Have a look. Was that it?

What is the "Upgrade-Insecure-Requests" HTTP header?

This explains the whole thing:

The HTTP Content-Security-Policy (CSP) upgrade-insecure-requests directive instructs user agents to treat all of a site's insecure URLs (those served over HTTP) as though they have been replaced with secure URLs (those served over HTTPS). This directive is intended for web sites with large numbers of insecure legacy URLs that need to be rewritten.

The upgrade-insecure-requests directive is evaluated before block-all-mixed-content and if it is set, the latter is effectively a no-op. It is recommended to set one directive or the other, but not both.

The upgrade-insecure-requests directive will not ensure that users visiting your site via links on third-party sites will be upgraded to HTTPS for the top-level navigation and thus does not replace the Strict-Transport-Security (HSTS) header, which should still be set with an appropriate max-age to ensure that users are not subject to SSL stripping attacks.

Source: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests

How to check if string input is a number?

try this! it worked for me even if I input negative numbers.

  def length(s):
    return len(s)

   s = input("Enter the String: ")
    try:
        if (type(int(s)))==int :
            print("You input an integer")

    except ValueError:      
        print("it is a string with length " + str(length(s)))   

How to delete $_POST variable upon pressing 'Refresh' button on browser with PHP?

How about using $_POST = array(), which nullifies the data. The browser will still ask to reload, but there will be no data in the $_POST superglobal.

iTunes Connect Screenshots Sizes for all iOS (iPhone/iPad/Apple Watch) devices

For iPhone 5.5" display you need to change the simulator to "Physical Size" on iPhone 8 Plus

Physical size

Get a Div Value in JQuery

myDivObj = document.getElementById("myDiv");
if ( myDivObj ) {
   alert ( myDivObj.innerHTML ); 
}else{
   alert ( "Alien Found" );
}

Above code will show the innerHTML, i.e if you have used html tags inside div then it will show even those too. probably this is not what you expected. So another solution is to use: innerText / textContent property [ thanx to bobince, see his comment ]

function showDivText(){
            divObj = document.getElementById("myDiv");
            if ( divObj ){
                if ( divObj.textContent ){ // FF
                    alert ( divObj.textContent );
                }else{  // IE           
                    alert ( divObj.innerText );  //alert ( divObj.innerHTML );
                } 
            }  
        }

Convert Swift string to array

An easy way to do this is to map the variable and return each Character as a String:

let someText = "hello"

let array = someText.map({ String($0) }) // [String]

The output should be ["h", "e", "l", "l", "o"].

Retrieve column values of the selected row of a multicolumn Access listbox

For multicolumn listbox extract data from any column of selected row by

 listboxControl.List(listboxControl.ListIndex,col_num)

where col_num is required column ( 0 for first column)

Javascript: how to validate dates in format MM-DD-YYYY?

try this:

function validateDate(dates){
    re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/;     
    var days=new Array(31,28,31,30,31,30,31,31,30,31,30,31);

            if(regs = dates.match(re)) {
                    // day value between 1 and 31
                    if(regs[1] < 1 || regs[1] > 31) {                    
                      return false;
                    }
                    // month value between 1 and 12
                    if(regs[2] < 1 || regs[2] > 12) {                         
                      return false;
                    }

                    var maxday=days[regs[2]-1];

                    if(regs[2]==2){
                        if(regs[3]%4==0){
                            maxday=maxday+1;                                
                        }
                    }

                    if(regs[1]>maxday){
                        return false;
                    }

                    return true;
              }else{
                  return false;
              }                   
}

Showing an image from an array of images - Javascript

Here's your problem:

if(imgArray[i] == img)

You're comparing an array element to a DOM object.

Adding blur effect to background in swift

Found another way.. I use apple's UIImage+ImageEffects.

 UIImage *effectImage = [image applyExtraLightEffect];                        
 self.imageView.image = effectImage;

Check if a path represents a file or a folder

To check if a string represents a path or a file programatically, you should use API methods such as isFile(), isDirectory().

How does system understand whether there's a file or a folder?

I guess, the file and folder entries are kept in a data structure and it's managed by the file system.

how to iterate through dictionary in a dictionary in django template?

Lets say your data is -

data = {'a': [ [1, 2] ], 'b': [ [3, 4] ],'c':[ [5,6]] }

You can use the data.items() method to get the dictionary elements. Note, in django templates we do NOT put (). Also some users mentioned values[0] does not work, if that is the case then try values.items.

<table>
    <tr>
        <td>a</td>
        <td>b</td>
        <td>c</td>
    </tr>

    {% for key, values in data.items %}
    <tr>
        <td>{{key}}</td>
        {% for v in values[0] %}
        <td>{{v}}</td>
        {% endfor %}
    </tr>
    {% endfor %}
</table>

Am pretty sure you can extend this logic to your specific dict.


To iterate over dict keys in a sorted order - First we sort in python then iterate & render in django template.

return render_to_response('some_page.html', {'data': sorted(data.items())})

In template file:

{% for key, value in data %}
    <tr>
        <td> Key: {{ key }} </td> 
        <td> Value: {{ value }} </td>
    </tr>
{% endfor %}

node.js, socket.io with SSL

Server-side:

import http from 'http';
import https from 'https';
import SocketIO, { Socket } from 'socket.io';
import fs from 'fs';
import path from 'path';

import { logger } from '../../utils';

const port: number = 3001;

const server: https.Server = https.createServer(
  {
    cert: fs.readFileSync(path.resolve(__dirname, '../../../ssl/cert.pem')),
    key: fs.readFileSync(path.resolve(__dirname, '../../../ssl/key.pem'))
  },
  (req: http.IncomingMessage, res: http.ServerResponse) => {
    logger.info(`request.url: ${req.url}`);

    let filePath = '.' + req.url;
    if (filePath === './') {
      filePath = path.resolve(__dirname, './index.html');
    }

    const extname = String(path.extname(filePath)).toLowerCase();
    const mimeTypes = {
      '.html': 'text/html',
      '.js': 'text/javascript',
      '.json': 'application/json'
    };

    const contentType = mimeTypes[extname] || 'application/octet-stream';

    fs.readFile(filePath, (error: NodeJS.ErrnoException, content: Buffer) => {
      if (error) {
        res.writeHead(500);
        return res.end(error.message);
      }
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    });
  }
);

const io: SocketIO.Server = SocketIO(server);

io.on('connection', (socket: Socket) => {
  socket.emit('news', { hello: 'world' });
  socket.on('updateTemplate', data => {
    logger.info(data);
    socket.emit('updateTemplate', { random: data });
  });
});

server.listen(port, () => {
  logger.info(`Https server is listening on https://localhost:${port}`);
});

Client-side:

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Websocket Secure Connection</title>
</head>

<body>
  <div>
    <button id='btn'>Send Message</button>
    <ul id='messages'></ul>
  </div>
  <script src='../../../node_modules/socket.io-client/dist/socket.io.js'></script>
  <script>
    window.onload = function onload() {
      const socket = io('https://localhost:3001');
      socket.on('news', function (data) {
        console.log(data);
      });

      socket.on('updateTemplate', function onUpdateTemplate(data) {
        console.log(data)
        createMessage(JSON.stringify(data));
      });
      const $btn = document.getElementById('btn');
      const $messages = document.getElementById('messages');

      function sendMessage() {
        socket.emit('updateTemplate', Math.random());
      }

      function createMessage(msg) {
        const $li = document.createElement('li');
        $li.textContent = msg;
        $messages.appendChild($li);
      }

      $btn.addEventListener('click', sendMessage);
    }
  </script>
</body>

</html>

How to have the formatter wrap code with IntelliJ?

You can create a macro for Ctrl +Shift + S (for example) that do all this things:

Edit > Macros > Start Macro Recording (the recording will start). Click where you need.

For example:

Code > Reformat Code
Code > Auto-Indent Lines
Code > Optimize Imports
Code > Rearrange Code
File > Save All
... (all that you want)

Then, click on red button in bottom-right of the IDE to stop the Macro recording.

Set a macro name.

Go to File > Settings > Macros > YOUR MACRO NAME.

Right Click > Add Keyboard Shortcut, and type Ctrl + Shift + S.

Add 2 hours to current time in MySQL?

SELECT * 
FROM courses 
WHERE DATE_ADD(NOW(), INTERVAL 2 HOUR) > start_time

See Date and Time Functions for other date/time manipulation.

How can I break up this long line in Python?

Personally I dislike hanging open blocks, so I'd format it as:

logger.info(
    'Skipping {0} because its thumbnail was already in our system as {1}.'
    .format(line[indexes['url']], video.title)
)

In general I wouldn't bother struggle too hard to make code fit exactly within a 80-column line. It's worth keeping line length down to reasonable levels, but the hard 80 limit is a thing of the past.

Get individual query parameters from Uri

I had to do this for a modern windows app. I used the following:

public static class UriExtensions
{
    private static readonly Regex _regex = new Regex(@"[?&](\w[\w.]*)=([^?&]+)");

    public static IReadOnlyDictionary<string, string> ParseQueryString(this Uri uri)
    {
        var match = _regex.Match(uri.PathAndQuery);
        var paramaters = new Dictionary<string, string>();
        while (match.Success)
        {
            paramaters.Add(match.Groups[1].Value, match.Groups[2].Value);
            match = match.NextMatch();
        }
        return paramaters;
    }
}

What data type to use for money in Java?

For simple case (one currency) it'is enough int/long. Keep money in cents (...) or hundredth / thousandth of cents (any precision you need with fixed divider)

Questions every good Java/Java EE Developer should be able to answer?

When would you use Session Beans or Message Driven Beans ?

How are transactions handled in session beans ?

What is the difference between local and remote session beans ? This question is more about knowing that RPCs are in the picture or not, since a method that is exposed as both Local or Remote might still work differently (side-effects on parameters are possible with Locals, while not possible with Remotes).

A good test is: never ask the questions in the same order. We had the experience with offshoring that sometimes they were actually giving the response in the wrong order :-). As a result you should make sure that you can actually see the person you are interrogating.

LaTeX Optional Arguments

Here's my attempt, it doesn't follow your specs exactly though. Not fully tested, so be cautious.

\newcount\seccount

\def\sec{%
    \seccount0%
    \let\go\secnext\go
}

\def\secnext#1{%
    \def\last{#1}%
    \futurelet\next\secparse
}

\def\secparse{%
    \ifx\next\bgroup
        \let\go\secparseii
    \else
        \let\go\seclast
    \fi
    \go
}

\def\secparseii#1{%
    \ifnum\seccount>0, \fi
    \advance\seccount1\relax
    \last
    \def\last{#1}%
    \futurelet\next\secparse
}

\def\seclast{\ifnum\seccount>0{} and \fi\last}%

\sec{a}{b}{c}{d}{e}
% outputs "a, b, c, d and e"

\sec{a}
% outputs "a"

\sec{a}{b}
% outputs "a and b"

Can not find module “@angular-devkit/build-angular”

Another issue could be with your dev-dependencies. Please check if they have been installed properly (check if they are availabe in the node_modules folder)

If not then a quick fix would be:

npm i --only=dev

Or check how your npm settings are regarding prod:

npm config get production

In case they are set to true - change them to false:

npm config set -g production false

and setup a new angular project.

Found that hint here: https://github.com/angular/angular-cli/issues/10661 (ken107 and lichunbin814)

Hope that helps.

How to install Jdk in centos

Try the following to see if you have the proper repository installed:

# yum search java | grep 'java-'

This is going to return a list of available packages that have java in the title. Specifically we are interested in the java- anything, as the jdk will typically be in 'java-version#' type format... Anyhow, if you have to install a repo look at Dag Wieers repo:

http://dag.wieers.com/rpm/FAQ.php#B

After you've got it installed try yum search again... This time you'll have a bunch of java stuff.

# yum search java | grep 'java-'

This will return the list of the available java packages. You can install one like this:

# yum install java-1.7.0-openjdk.x86_64

Chrome, Javascript, window.open in new tab

if you use window.open(url, '_blank') , it will be blocked(popup blocker) on Chrome,Firefox etc

try this,

$('#myButton').click(function () {
    var redirectWindow = window.open('http://google.com', '_blank');
    redirectWindow.location;
});

working js fiddle for this http://jsfiddle.net/safeeronline/70kdacL4/2/

working js fiddle for ajax window open http://jsfiddle.net/safeeronline/70kdacL4/1/

How to place and center text in an SVG rectangle

If you are creating the SVG programmatically you can simplify it and do something like this:

  <g>
      <rect x={x} y={y} width={width} height={height} />
      <text
          x={x + width / 2}
          y={y + height / 2}
          dominant-baseline="middle"
          text-anchor="middle"
      >
          {label}
      </text>
  </g>

Asp.Net MVC with Drop Down List, and SelectListItem Assistance

Step-1: Your Model class

public class RechargeMobileViewModel
    {
        public string CustomerFullName { get; set; }
        public string TelecomSubscriber { get; set; }
        public int TotalAmount { get; set; }
        public string MobileNumber { get; set; }
        public int Month { get; set; }
        public List<SelectListItem> getAllDaysList { get; set; }

        // Define the list which you have to show in Drop down List
        public List<SelectListItem> getAllWeekDaysList()
        {
            List<SelectListItem> myList = new List<SelectListItem>();
            var data = new[]{
                 new SelectListItem{ Value="1",Text="Monday"},
                 new SelectListItem{ Value="2",Text="Tuesday"},
                 new SelectListItem{ Value="3",Text="Wednesday"},
                 new SelectListItem{ Value="4",Text="Thrusday"},
                 new SelectListItem{ Value="5",Text="Friday"},
                 new SelectListItem{ Value="6",Text="Saturday"},
                 new SelectListItem{ Value="7",Text="Sunday"},
             };
            myList = data.ToList();
            return myList;
        }
}

Step-2: Call this method to fill Drop down in your controller Action

namespace MvcVariousApplication.Controllers
    {
        public class HomeController : Controller
        {
            public ActionResult Index()
            {
              RechargeMobileViewModel objModel = new RechargeMobileViewModel();
                objModel.getAllDaysList = objModel.getAllWeekDaysList();  
                return View(objModel);
            }
    }
    }

Step-3: Fill your Drop-Down List of View as follows

 @model MvcVariousApplication.Models.RechargeMobileViewModel
    @{
        ViewBag.Title = "Contact";
    }
    @Html.LabelFor(model=> model.CustomerFullName)
    @Html.TextBoxFor(model => model.CustomerFullName)

    @Html.LabelFor(model => model.MobileNumber)
    @Html.TextBoxFor(model => model.MobileNumber)

    @Html.LabelFor(model => model.TelecomSubscriber)
    @Html.TextBoxFor(model => model.TelecomSubscriber)

    @Html.LabelFor(model => model.TotalAmount)
    @Html.TextBoxFor(model => model.TotalAmount)

    @Html.LabelFor(model => model.Month)
    @Html.DropDownListFor(model => model.Month, new SelectList(Model.getAllDaysList, "Value", "Text"), "-Select Day-")

How do I enable EF migrations for multiple contexts to separate databases?

EF 4.7 actually gives a hint when you run Enable-migrations at multiple context.

More than one context type was found in the assembly 'Service.Domain'.

To enable migrations for 'Service.Domain.DatabaseContext.Context1', 
use Enable-Migrations -ContextTypeName Service.Domain.DatabaseContext.Context1.
To enable migrations for 'Service.Domain.DatabaseContext.Context2',
use Enable-Migrations -ContextTypeName Service.Domain.DatabaseContext.Context2.

SQL WHERE condition is not equal to?

Best solution is to use

DELETE FROM table WHERE id NOT IN ( 2 )

Multiple condition in single IF statement

Yes it is, there have to be boolean expresion after IF. Here you have a direct link. I hope it helps. GL!

Convert to binary and keep leading zeros in Python

You can use zfill:

print str(1).zfill(2) 
print str(10).zfill(2) 
print str(100).zfill(2)

prints:

01
10
100

I like this solution, as it helps not only when outputting the number, but when you need to assign it to a variable... e.g. - x = str(datetime.date.today().month).zfill(2) will return x as '02' for the month of feb.

How do I disable the resizable property of a textarea?

CSS 3 has a new property for UI elements that will allow you to do this. The property is the resize property. So you would add the following to your stylesheet to disable resizing of all textarea elements:

textarea { resize: none; }

This is a CSS 3 property; use a compatibility chart to see browser compatibility.

Personally, I would find it very annoying to have resizing disabled on textarea elements. This is one of those situations where the designer is trying to "break" the user's client. If your design can't accommodate a larger textarea, you might want to reconsider how your design works. Any user can add textarea { resize: both !important; } to their user stylesheet to override your preference.

C++ passing an array pointer as a function argument

int *a[], when used as a function parameter (but not in normal declarations), is a pointer to a pointer, not a pointer to an array (in normal declarations, it is an array of pointers). A pointer to an array looks like this:

int (*aptr)[N]

Where N is a particular positive integer (not a variable).

If you make your function a template, you can do it and you don't even need to pass the size of the array (because it is automatically deduced):

template<size_t SZ>
void generateArray(int (*aptr)[SZ])
{
    for (size_t i=0; i<SZ; ++i)
        (*aptr)[i] = rand() % 9;
}

int main()
{    
    int a[5];    
    generateArray(&a);
}

You could also take a reference:

template<size_t SZ>
void generateArray(int (&arr)[SZ])
{
    for (size_t i=0; i<SZ; ++i)
        arr[i] = rand() % 9;
}

int main()
{    
    int a[5];    
    generateArray(a);
}

Ruby: Can I write multi-line string with no concatenation?

Sometimes is worth to remove new line characters \n like:

conn.exec <<-eos.squish
 select attr1, attr2, attr3, attr4, attr5, attr6, attr7
 from table1, table2, table3, etc, etc, etc, etc, etc,
 where etc etc etc etc etc etc etc etc etc etc etc etc etc
eos

restart mysql server on windows 7

I just have the same problem, just open the task manager, go to services tab and search MySQL_One service, rigth click and start, this works for very good.

MySQL "Group By" and "Order By"

I struggled with both these approaches for more complex queries than those shown, because the subquery approach was horribly ineficient no matter what indexes I put on, and because I couldn't get the outer self-join through Hibernate

The best (and easiest) way to do this is to group by something which is constructed to contain a concatenation of the fields you require and then to pull them out using expressions in the SELECT clause. If you need to do a MAX() make sure that the field you want to MAX() over is always at the most significant end of the concatenated entity.

The key to understanding this is that the query can only make sense if these other fields are invariant for any entity which satisfies the Max(), so in terms of the sort the other pieces of the concatenation can be ignored. It explains how to do this at the very bottom of this link. http://dev.mysql.com/doc/refman/5.0/en/group-by-hidden-columns.html

If you can get am insert/update event (like a trigger) to pre-compute the concatenation of the fields you can index it and the query will be as fast as if the group by was over just the field you actually wanted to MAX(). You can even use it to get the maximum of multiple fields. I use it to do queries against multi-dimensional trees expresssed as nested sets.

Transactions in .net

There are 2 main kinds of transactions; connection transactions and ambient transactions. A connection transaction (such as SqlTransaction) is tied directly to the db connection (such as SqlConnection), which means that you have to keep passing the connection around - OK in some cases, but doesn't allow "create/use/release" usage, and doesn't allow cross-db work. An example (formatted for space):

using (IDbTransaction tran = conn.BeginTransaction()) {
    try {
        // your code
        tran.Commit();
    }  catch {
        tran.Rollback();
        throw;
    }
}

Not too messy, but limited to our connection "conn". If we want to call out to different methods, we now need to pass "conn" around.

The alternative is an ambient transaction; new in .NET 2.0, the TransactionScope object (System.Transactions.dll) allows use over a range of operations (suitable providers will automatically enlist in the ambient transaction). This makes it easy to retro-fit into existing (non-transactional) code, and to talk to multiple providers (although DTC will get involved if you talk to more than one).

For example:

using(TransactionScope tran = new TransactionScope()) {
    CallAMethodThatDoesSomeWork();
    CallAMethodThatDoesSomeMoreWork();
    tran.Complete();
}

Note here that the two methods can handle their own connections (open/use/close/dispose), yet they will silently become part of the ambient transaction without us having to pass anything in.

If your code errors, Dispose() will be called without Complete(), so it will be rolled back. The expected nesting etc is supported, although you can't roll-back an inner transaction yet complete the outer transaction: if anybody is unhappy, the transaction is aborted.

The other advantage of TransactionScope is that it isn't tied just to databases; any transaction-aware provider can use it. WCF, for example. Or there are even some TransactionScope-compatible object models around (i.e. .NET classes with rollback capability - perhaps easier than a memento, although I've never used this approach myself).

All in all, a very, very useful object.

Some caveats:

  • On SQL Server 2000, a TransactionScope will go to DTC immediately; this is fixed in SQL Server 2005 and above, it can use the LTM (much less overhead) until you talk to 2 sources etc, when it is elevated to DTC.
  • There is a glitch that means you might need to tweak your connection string

Can I load a UIImage from a URL?

Check out the AsyncImageView provided over here. Some good example code, and might even be usable right "out of the box" for you.

iOS: How to store username/password within an app?

For swift you can use this library:

https://github.com/jrendel/SwiftKeychainWrapper

It supports all versions of swift.

process.env.NODE_ENV is undefined

tips

in package.json:

"scripts": {
  "start": "set NODE_ENV=dev && node app.js"
 }

in app.js:

console.log(process.env.NODE_ENV) // dev
console.log(process.env.NODE_ENV === 'dev') // false
console.log(process.env.NODE_ENV.length) // 4 (including a space at the end) 

so, this may better:

"start": "set NODE_ENV=dev&& node app.js"

or

console.log(process.env.NODE_ENV.trim() === 'dev') // true

How to fix org.hibernate.LazyInitializationException - could not initialize proxy - no Session

I encountered the same issue. I think another way to fix this is that you can change the query to join fetch your Element from Model as follows:

Query query = session.createQuery("from Model m join fetch m.element where modelGroup.id = :modelGroupId")

CSS @media print issues with background-color;

You can use the tag canvas and "draw" the background, which work on IE9, Gecko and Webkit.

Working with time DURATION, not time of day

The best way I found to resolve this issue was by using a combination of the above. All my cells were entered as a Custom Format to only show "HH:MM" - if I entered in "4:06" (being 4 minutes and 6 seconds) the field would show the numbers I entered correctly - but the data itself would represent HH:MM in the background.

Fortunately time is based on factors of 60 (60 seconds = 60 minutes). So 7H:15M / 60 = 7M:15S - I hope you can see where this is going. Accordingly, if I take my 4:06 and divide by 60 when working with the data (eg. to total up my total time or average time across 100 cells I would use the normal SUM or AVERAGE formulas and then divide by 60 in the formula.

Example =(SUM(A1:A5))/60. If my data was across the 5 time tracking fields was the 4:06, 3:15, 9:12, 2:54, 7:38 (representing MM:SS for us, but the data in the background is actually HH:MM) then when I work out the sum of those 5 fields are, what I want should be 27M:05S but what shows instead is 1D:03H:05M:00S. As mentioned above, 1D:3H:5M divided by 60 = 27M:5S ... which is the sum I am looking for.

Further examples of this are: =(SUM(G:G))/60 and =(AVERAGE(B2:B90)/60) and =MIN(C:C) (this is a direct check so no /60 needed here!).

Note that your "formula" or "calculation" fields (average, total time, etc) MUST have the custom format of MM:SS once you have divided by 60 as Excel's default thinking is in HH:MM (hence this issue). Your data fields where you are entering in your times should need to be changed from "General" or "Number" format to the custom format of HH:MM.

This process is still a little bit cumbersome to use - but it does mean that your data entry is still entered in very easy and is "correctly" displayed on screen as 4:06 (which most people would view as minutes:seconds when under a "Minutes" header). Generally there will only be a couple of fields needing to be used for formulas such as "best time", "average time", "total time" etc when tracking times and they will not usually be changed once the formula is entered so this will be a "one off" process - I use this for my call tracking sheet at work to track "average call", "total call time for day".

What is the "proper" way to cast Hibernate Query.list() to List<Type>?

List<Person> list = new ArrayList<Person>();
Criteria criteria = this.getSessionFactory().getCurrentSession().createCriteria(Person.class);
for (final Object o : criteria.list()) {
    list.add((Person) o);
}

Apache Cordova - uninstall globally

Super late here and I still couldn't uninstall using sudo as the other answers suggest. What did it for me was checking where cordova was installed by running

which cordova

it will output something like this

/usr/local/bin/

then removing by

rm -rf /usr/local/bin/cordova

Show loading image while $.ajax is performed

Use the ajax object's beforeSend and complete functions. It's better to show the gif from inside beforeSend so that all the behavior is encapsulated in a single object. Be careful about hiding the gif using the success function. If the request fails, you'll probably still want to hide the gif. To do this use the Complete function. It would look like this:

$.ajax({
    url: uri,
    cache: false,
    beforeSend: function(){
        $('#image').show();
    },
    complete: function(){
        $('#image').hide();
    },
    success: function(html){
       $('.info').append(html);
    }
});

How can I make my match non greedy in vim?

I've found that a good solution to this type of question is:

:%!sed ...

(or perl if you prefer). IOW, rather than learning vim's regex peculiarities, use a tool you already know. Using perl would make the ? modifier work to ungreedy the match.

Android Error Building Signed APK: keystore.jks not found for signing config 'externalOverride'

TL;DR: Check the path to your keystore.jks file.

In my case, here's what happened:

I moved the project folder of my entire app to another location on my PC. Much later, I wanted to generate a signed apk file. Unknown to me, the default location of the path to my keystore.jks had been reset to a wrong location and I had clicked okay. Since it could not find a keystore at the path I selected, I got that error.

The solution was to check whether the path to my keystore.jks file was correct.

How can I permanently enable line numbers in IntelliJ?

I add this response for IntelliJ IDEA 2018.2 - Ultimate.

Using menu

IntelliJ Idea > Preferences > Editor > General > Appearance > Show Line Numbers

enter image description here

Using Shortcuts - First way

For Windows : Ctrl+Shift+a
For Mac : Cmd+shift+a

enter image description here

Using Shortcuts - Seconde way

Touch Shift twice

enter image description here

These three methods exist since the last 4 versions of Intellij and I think they remain valid for a long time.

Detect if range is empty

IsEmpty returns True if the variable is uninitialized, or is explicitly set to Empty; otherwise, it returns False. False is always returned if expression contains more than one variable. IsEmpty only returns meaningful information for variants. (https://msdn.microsoft.com/en-us/library/office/gg264227.aspx) . So you must check every cell in range separately:

    Dim thisColumn as Byte, thisRow as Byte

    For thisColumn = 1 To 5
        For ThisRow = 1 To 6
             If IsEmpty(Cells(thisRow, thisColumn)) = False Then
                 GoTo RangeIsNotEmpty
             End If
        Next thisRow
    Next thisColumn
    ...........
    RangeIsNotEmpty: 

Of course here are more code than in solution with CountA function which count not empty cells, but GoTo can interupt loops if at least one not empty cell is found and do your code faster especially if range is large and you need to detect this case. Also this code for me is easier to understand what it is doing, than with Excel CountA function which is not VBA function.

A required class was missing while executing org.apache.maven.plugins:maven-war-plugin:2.1.1:war

Try to delete the maven folder at ~/.m2/repository/org/apache/maven and build your project again to force the maven libraries be downloaded. This worked for me the last time I faced this java.lang.NoClassDefFoundError: org/apache/maven/shared/filtering/MavenFilteringException.

css with background image without repeating the image

This is all you need:

background-repeat: no-repeat;

Check if MySQL table exists or not

Updated mysqli version:

if ($result = $mysqli->query("SHOW TABLES LIKE '".$table."'")) {
    if($result->num_rows == 1) {
        echo "Table exists";
    }
}
else {
    echo "Table does not exist";
}

Original mysql version:

if(mysql_num_rows(mysql_query("SHOW TABLES LIKE '".$table."'"))==1) 
    echo "Table exists";
else echo "Table does not exist";

Referenced from the PHP docs.

What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?

I think the Vim documentation should've explained the meaning behind the naming of these commands. Just telling you what they do doesn't help you remember the names.

map is the "root" of all recursive mapping commands. The root form applies to "normal", "visual+select", and "operator-pending" modes. (I'm using the term "root" as in linguistics.)

noremap is the "root" of all non-recursive mapping commands. The root form applies to the same modes as map. (Think of the nore prefix to mean "non-recursive".)

(Note that there are also the ! modes like map! that apply to insert & command-line.)

See below for what "recursive" means in this context.

Prepending a mode letter like n modify the modes the mapping works in. It can choose a subset of the list of applicable modes (e.g. only "visual"), or choose other modes that map wouldn't apply to (e.g. "insert").

Use help map-modes will show you a few tables that explain how to control which modes the mapping applies to.

Mode letters:

  • n: normal only
  • v: visual and select
  • o: operator-pending
  • x: visual only
  • s: select only
  • i: insert
  • c: command-line
  • l: insert, command-line, regexp-search (and others. Collectively called "Lang-Arg" pseudo-mode)

"Recursive" means that the mapping is expanded to a result, then the result is expanded to another result, and so on.

The expansion stops when one of these is true:

  1. the result is no longer mapped to anything else.
  2. a non-recursive mapping has been applied (i.e. the "noremap" [or one of its ilk] is the final expansion).

At that point, Vim's default "meaning" of the final result is applied/executed.

"Non-recursive" means the mapping is only expanded once, and that result is applied/executed.

Example:

 nmap K H
 nnoremap H G
 nnoremap G gg

The above causes K to expand to H, then H to expand to G and stop. It stops because of the nnoremap, which expands and stops immediately. The meaning of G will be executed (i.e. "jump to last line"). At most one non-recursive mapping will ever be applied in an expansion chain (it would be the last expansion to happen).

The mapping of G to gg only applies if you press G, but not if you press K. This mapping doesn't affect pressing K regardless of whether G was mapped recursively or not, since it's line 2 that causes the expansion of K to stop, so line 3 wouldn't be used.

Python loop to run for certain amount of seconds

I was looking for an easier-to-read time-loop when I encountered this question here. Something like:

for sec in max_seconds(10):
      do_something()

So I created this helper:

# allow easy time-boxing: 'for sec in max_seconds(42): do_something()'
def max_seconds(max_seconds, *, interval=1):
    interval = int(interval)
    start_time = time.time()
    end_time = start_time + max_seconds
    yield 0
    while time.time() < end_time:
        if interval > 0:
            next_time = start_time
            while next_time < time.time():
                next_time += interval
            time.sleep(int(round(next_time - time.time())))
        yield int(round(time.time() - start_time))
        if int(round(time.time() + interval)) > int(round(end_time)): 
            return

It only works with full seconds which was OK for my use-case.

Examples:

for sec in max_seconds(10) # -> 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
for sec in max_seconds(10, interval=3) # -> 0, 3, 6, 9
for sec in max_seconds(7): sleep(1.5) # -> 0, 2, 4, 6
for sec in max_seconds(8): sleep(1.5) # -> 0, 2, 4, 6, 8

Be aware that interval isn't that accurate, as I only wait full seconds (sleep never was any good for me with times < 1 sec). So if your job takes 500 ms and you ask for an interval of 1 sec, you'll get called at: 0, 500ms, 2000ms, 2500ms, 4000ms and so on. One could fix this by measuring time in a loop rather than sleep() ...

Setting the default Java character encoding

Unfortunately, the file.encoding property has to be specified as the JVM starts up; by the time your main method is entered, the character encoding used by String.getBytes() and the default constructors of InputStreamReader and OutputStreamWriter has been permanently cached.

As Edward Grech points out, in a special case like this, the environment variable JAVA_TOOL_OPTIONS can be used to specify this property, but it's normally done like this:

java -Dfile.encoding=UTF-8 … com.x.Main

Charset.defaultCharset() will reflect changes to the file.encoding property, but most of the code in the core Java libraries that need to determine the default character encoding do not use this mechanism.

When you are encoding or decoding, you can query the file.encoding property or Charset.defaultCharset() to find the current default encoding, and use the appropriate method or constructor overload to specify it.

Possible reason for NGINX 499 error codes

I know this is an old thread, but it exactly matches what recently happened to me and I thought I'd document it here. The setup (in Docker) is as follows:

  • nginx_proxy
  • nginx
  • php_fpm running the actual app.

The symptom was a "502 Gateway Timeout" on the application login prompt. Examination of logs found:

  • the button works via an HTTP POST to /login ... and so ...
  • nginx-proxy got the /login request, and eventually reported a timeout.
  • nginx returned a 499 response, which of course means "the host died."
  • the /login request did not appear at all(!) in the FPM server's logs!
  • there were no tracebacks or error-messages in FPM ... nada, zero, zippo, none.

It turned out that the problem was a failure to connect to the database to verify the login. But how to figure that out turned out to be pure guesswork.

The complete absence of application traceback logs ... or even a record that the request had been received by FPM ... was a complete (and, devastating ...) surprise to me. Yes, the application is supposed to log failures, but in this case it looks like the FPM worker process died with a runtime error, leading to the 499 response from nginx. Now, this obviously is a problem in our application ... somewhere. But I wanted to record the particulars of what happened for the benefit of the next folks who face something like this.

Conditional formatting, entire row based

=$G1="X"

would be the correct (and easiest) method. Just select the entire sheet first, as conditional formatting only works on selected cells. I just tried it and it works perfectly. You must start at G1 rather than G2 otherwise it will offset the conditional formatting by a row.

Convert python long/int to fixed size byte array

Little-endian, reverse the result or the range if you want Big-endian:

def int_to_bytes(val, num_bytes):
    return [(val & (0xff << pos*8)) >> pos*8 for pos in range(num_bytes)]

Big-endian:

def int_to_bytes(val, num_bytes):
    return [(val & (0xff << pos*8)) >> pos*8 for pos in reversed(range(num_bytes))]

Assigning multiple styles on an HTML element

The way you have used the HTML syntax is problematic.

This is how the syntax should be

style="property1:value1;property2:value2"

In your case, this will be the way to do

<h2 style="text-align :center; font-family :tahoma" >TITLE</h2>

A further example would be as follows

<div class ="row">
    <button type="button" style= "margin-top : 20px; border-radius: 15px" 
    class="btn btn-primary">View Full Profile</button>
</div>

Iterating Through a Dictionary in Swift

This is a user-defined function to iterate through a dictionary:

func findDic(dict: [String: String]){
    for (key, value) in dict{
    print("\(key) : \(value)")
  }
}

findDic(dict: ["Animal":"Lion", "Bird":"Sparrow"])
//prints Animal : Lion 
         Bird : Sparrow

Postgres - Transpose Rows to Columns

Use crosstab() from the tablefunc module.

SELECT * FROM crosstab(
   $$SELECT user_id, user_name, rn, email_address
     FROM  (
        SELECT u.user_id, u.user_name, e.email_address
             , row_number() OVER (PARTITION BY u.user_id
                            ORDER BY e.creation_date DESC NULLS LAST) AS rn
        FROM   usr u
        LEFT   JOIN email_tbl e USING (user_id)
        ) sub
     WHERE  rn < 4
     ORDER  BY user_id
   $$
  , 'VALUES (1),(2),(3)'
   ) AS t (user_id int, user_name text, email1 text, email2 text, email3 text);

I used dollar-quoting for the first parameter, which has no special meaning. It's just convenient if you have to escape single quotes in the query string which is a common case:

Detailed explanation and instructions here:

And in particular, for "extra columns":

The special difficulties here are:

  • The lack of key names.
    -> We substitute with row_number() in a subquery.

  • The varying number of emails.
    -> We limit to a max. of three in the outer SELECT
    and use crosstab() with two parameters, providing a list of possible keys.

Pay attention to NULLS LAST in the ORDER BY.

Failed to create provisioning profile

I had same problem with provisioning profile. If you have any kind of iPhone, you can connect to your Mac with cable and provisioning profile is automatically defined. enter image description here

What is the closest thing Windows has to fork()?

I certainly don't know the details on this because I've never done it it, but the native NT API has a capability to fork a process (the POSIX subsystem on Windows needs this capability - I'm not sure if the POSIX subsystem is even supported anymore).

A search for ZwCreateProcess() should get you some more details - for example this bit of information from Maxim Shatskih:

The most important parameter here is SectionHandle. If this parameter is NULL, the kernel will fork the current process. Otherwise, this parameter must be a handle of the SEC_IMAGE section object created on the EXE file before calling ZwCreateProcess().

Though note that Corinna Vinschen indicates that Cygwin found using ZwCreateProcess() still unreliable:

Iker Arizmendi wrote:

> Because the Cygwin project relied solely on Win32 APIs its fork
> implementation is non-COW and inefficient in those cases where a fork
> is not followed by exec.  It's also rather complex. See here (section
> 5.6) for details:
>  
> http://www.redhat.com/support/wpapers/cygnus/cygnus_cygwin/architecture.html

This document is rather old, 10 years or so. While we're still using Win32 calls to emulate fork, the method has changed noticably. Especially, we don't create the child process in the suspended state anymore, unless specific datastructes need a special handling in the parent before they get copied to the child. In the current 1.5.25 release the only case for a suspended child are open sockets in the parent. The upcoming 1.7.0 release will not suspend at all.

One reason not to use ZwCreateProcess was that up to the 1.5.25 release we're still supporting Windows 9x users. However, two attempts to use ZwCreateProcess on NT-based systems failed for one reason or another.

It would be really nice if this stuff would be better or at all documented, especially a couple of datastructures and how to connect a process to a subsystem. While fork is not a Win32 concept, I don't see that it would be a bad thing to make fork easier to implement.

WebView link click open default browser

you can use Intent for this:

Intent browserIntent = new Intent("android.intent.action.VIEW", Uri.parse("your Url"));
startActivity(browserIntent);

How do I create a custom Error in JavaScript?

This section of the standard may explain why the Error.apply call doesn't initialize the object:

15.11.1 The Error Constructor Called as a Function

When Error is called as a function rather than as a constructor, it creates and initialises a new Error object. Thus the function call Error(...) is equivalent to the object creation expression new Error(...) with the same arguments.

In this case the Error function probably determines that it's not being called as a constructor, so it returns a new Error instance rather than initializing the this object.

Testing with the following code seems to demonstrate that this is in fact what's happening:

function NotImplementedError() { 
   var returned = Error.apply(this, arguments);
   console.log("returned.message = '" + returned.message + "'");
   console.log("this.message = '" + this.message + "'");
}
NotImplementedError.prototype = new Error();

var nie = new NotImplementedError("some message");

The following output is generated when this is run:

returned.message = 'some message'
this.message = ''

PowerShell try/catch/finally

That is very odd.

I went through ItemNotFoundException's base classes and tested the following multiple catches to see what would catch it:

try {
  remove-item C:\nonexistent\file.txt -erroraction stop
}
catch [System.Management.Automation.ItemNotFoundException] {
  write-host 'ItemNotFound'
}
catch [System.Management.Automation.SessionStateException] {
  write-host 'SessionState'
}
catch [System.Management.Automation.RuntimeException] {
  write-host 'RuntimeException'
}
catch [System.SystemException] {
  write-host 'SystemException'
}
catch [System.Exception] {
  write-host 'Exception'
}
catch {
  write-host 'well, darn'
}

As it turns out, the output was 'RuntimeException'. I also tried it with a different exception CommandNotFoundException:

try {
  do-nonexistent-command
}
catch [System.Management.Automation.CommandNotFoundException] {
  write-host 'CommandNotFoundException'
}
catch {
  write-host 'well, darn'
}

That output 'CommandNotFoundException' correctly.

I vaguely remember reading elsewhere (though I couldn't find it again) of problems with this. In such cases where exception filtering didn't work correctly, they would catch the closest Type they could and then use a switch. The following just catches Exception instead of RuntimeException, but is the switch equivalent of my first example that checks all base types of ItemNotFoundException:

try {
  Remove-Item C:\nonexistent\file.txt -ErrorAction Stop
}
catch [System.Exception] {
  switch($_.Exception.GetType().FullName) {
    'System.Management.Automation.ItemNotFoundException' {
      write-host 'ItemNotFound'
    }
    'System.Management.Automation.SessionStateException' {
      write-host 'SessionState'
    }
    'System.Management.Automation.RuntimeException' {
      write-host 'RuntimeException'
    }
    'System.SystemException' {
      write-host 'SystemException'
    }
    'System.Exception' {
      write-host 'Exception'
    }
    default {'well, darn'}
  }
}

This writes 'ItemNotFound', as it should.

Adding value to input field with jQuery

You can do it as below.

$(this).prev('input').val("hello world");

Live Demo

How to add an image to the emulator gallery in android studio?

After trying to add an image via the Device Monitor or via drop, I could find it when exploring, but it was still not shown in the Gallery.

For me, it helped to eject the (virtual) sdcard from Settings > Storage & USB and reinserting it.

create table in postgreSQL

Replace bigint(20) not null auto_increment by bigserial not null and datetime by timestamp

Height of an HTML select box (dropdown)

i have been working on a dropdown replacement jquery plugin to combat this problem. As of this post, it is almost indistinguishable from a native dropdown in terms of look and functionality.

here is a demo (also a link to downloads): http://programmingdrunk.com/current-projects/dropdownReplacement/

here is the project page of the plugin:

http://plugins.jquery.com/project/dropdownreplacement

(update:) the jquery plugin page seems to no longer work. I will probably not put my plugin on their new site when they get it working, so feel free to use the programmingdrunk.com link for demo/download

Java 8 Stream and operation on arrays

There are new methods added to java.util.Arrays to convert an array into a Java 8 stream which can then be used for summing etc.

int sum =  Arrays.stream(myIntArray)
                 .sum();

Multiplying two arrays is a little more difficult because I can't think of a way to get the value AND the index at the same time as a Stream operation. This means you probably have to stream over the indexes of the array.

//in this example a[] and b[] are same length
int[] a = ...
int[] b = ...

int[] result = new int[a.length];

IntStream.range(0, a.length)
         .forEach(i -> result[i] = a[i] * b[i]);

EDIT

Commenter @Holger points out you can use the map method instead of forEach like this:

int[] result = IntStream.range(0, a.length).map(i -> a[i] * b[i]).toArray();

Error in plot.window(...) : need finite 'xlim' values

I had the same problem. I solve it when I convert string to factor. In your case, check the class of variable and check if they are numeric and 'train and test' should be factor.

How to allow only numeric (0-9) in HTML inputbox using jQuery?

Use the jquery numeric value. Below function allows for decimal and numeric values.
Example: $("#inputId").numeric({ allow: "." });

How is "mvn clean install" different from "mvn install"?

You can call more than one target goal with maven. mvn clean install calls clean first, then install. You have to clean manually, because clean is not a standard target goal and not executed automatically on every install.

clean removes the target folder - it deletes all class files, the java docs, the jars, reports and so on. If you don't clean, then maven will only "do what has to be done", like it won't compile classes when the corresponding source files haven't changed (in brief).

we call it target in ant and goal in maven

FirstOrDefault: Default value other than null

As I understand it, in Linq the method FirstOrDefault() can return a Default value of something other than null.

No. Or rather, it always returns the default value for the element type... which is either a null reference, the null value of a nullable value type, or the natural "all zeroes" value for a non-nullable value type.

Is there any particular way that this can be set up so that if there is no value for a particular query some predefined value is returned as the default value?

For reference types, you can just use:

var result = query.FirstOrDefault() ?? otherDefaultValue;

Of course this will also give you the "other default value" if the first value is present, but is a null reference...

How Big can a Python List Get?

As the Python documentation says:

sys.maxsize

The largest positive integer supported by the platform’s Py_ssize_t type, and thus the maximum size lists, strings, dicts, and many other containers can have.

In my computer (Linux x86_64):

>>> import sys
>>> print sys.maxsize
9223372036854775807

How do I automatically play a Youtube video (IFrame API) muted?

Youtube don't provide muting through url parameter (see http://code.google.com/apis/youtube/player_parameters.html).

You have to use javascript for that. see http://code.google.com/apis/youtube/js_api_reference.html for details.

However, please note the warning on the page linked above: "The deprecation of the YouTube JavaScript Player API was announced on January 27, 2015. YouTube Flash embeds have also been deprecated. See the deprecation policy for more information. Please migrate your applications to the IFrame API, which can intelligently use whichever embedded player – HTML () or Flash () – the client supports."

Html

<iframe class="youtube-player" id="player" type="text/html" src="http://www.youtube.com/embed/JW5meKfy3fY?wmode=opaque&autohide=1&autoplay=1&enablejsapi=1" frameborder="0">&lt;br /&gt;</iframe>

please note enablejsapi=1 in the url.

Javascript

var player =  iframe.getElementById('player');
player.mute();

Update

Previous code had some issues and did not work with current API (playerVars syntax was wrong). Here is the updated code. You may need to tinker with the parameters you need.

_x000D_
_x000D_
         _x000D_
    <div id="player"></div>_x000D_
    <script>_x000D_
      // 1. This code loads the IFrame Player API code asynchronously._x000D_
      var tag = document.createElement('script');_x000D_
_x000D_
      tag.src = "https://www.youtube.com/iframe_api";_x000D_
      var firstScriptTag = document.getElementsByTagName('script')[0];_x000D_
      firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);_x000D_
_x000D_
      // 2. This function creates an <iframe> (and YouTube player)_x000D_
      //    after the API code downloads._x000D_
      var player;_x000D_
      function onYouTubeIframeAPIReady() {_x000D_
        player = new YT.Player('player', {_x000D_
          height: '100%',_x000D_
          width: '100%',_x000D_
          playerVars: {_x000D_
                    autoplay: 1,_x000D_
                    loop: 1,_x000D_
                    controls: 0,_x000D_
                    showinfo: 0,_x000D_
                    autohide: 1,_x000D_
                    modestbranding: 1,_x000D_
                    vq: 'hd1080'},_x000D_
          videoId: '1pzWROvY7gY',_x000D_
          events: {_x000D_
            'onReady': onPlayerReady,_x000D_
            'onStateChange': onPlayerStateChange_x000D_
          }_x000D_
        });_x000D_
      }_x000D_
_x000D_
      // 3. The API will call this function when the video player is ready._x000D_
      function onPlayerReady(event) {_x000D_
        event.target.playVideo();_x000D_
        player.mute();_x000D_
      }_x000D_
_x000D_
      var done = false;_x000D_
      function onPlayerStateChange(event) {_x000D_
        _x000D_
      }_x000D_
      function stopVideo() {_x000D_
        player.stopVideo();_x000D_
      }_x000D_
    </script>
_x000D_
_x000D_
_x000D_

HTML 5 video or audio playlist

I optimized the javascript code from cameronjonesweb a little bit. Now you can just add the clips into the array. Everything else is done automatically.

<video autoplay controls id="Player" src="http://www.w3schools.com/html/movie.mp4" onclick="this.paused ? this.play() : this.pause();">Your browser does not support the video tag.</video>

<script>
var nextsrc = ["http://www.w3schools.com/html/movie.mp4","http://www.w3schools.com/html/mov_bbb.mp4"];
var elm = 0; var Player = document.getElementById('Player');
Player.onended = function(){
    if(++elm < nextsrc.length){         
         Player.src = nextsrc[elm]; Player.play();
    } 
}
</script>

Why does an onclick property set with setAttribute fail to work in IE?

function CheckBrowser(){
    if(navigator.userAgent.match(/Android/i)!=null||
        navigator.userAgent.match(/BlackBerry/i)!=null||
        navigator.userAgent.match(/iPhone|iPad|iPod/i)!=null||
        navigator.userAgent.match(/Nokia/i)!=null||
        navigator.userAgent.match(/Opera M/i)!=null||
        navigator.userAgent.match(/Chrome/i)!=null)
        {
            return 'OTHER';
    }else{
            return 'IE';
    }
}


function AddButt(i){
    var new_butt = document.createElement('input');
    new_butt.setAttribute('type','button');
    new_butt.setAttribute('value','Delete Item');
    new_butt.setAttribute('id', 'answer_del_'+i);
    if(CheckBrowser()=='IE'){
        new_butt.setAttribute("onclick", function() { DelElemAnswer(i) });
    }else{
        new_butt.setAttribute('onclick','javascript:DelElemAnswer('+i+');');
    }
}

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

~/.gradle/gradle.properties:

mavenUser=admin
mavenPassword=admin123

build.gradle:

...
authentication(userName: mavenUser, password: mavenPassword)

Navigation drawer: How do I set the selected item at startup?

First of all create colors for selected item. Here https://stackoverflow.com/a/30594875/1462969 good example. It helps you to change color of icon. For changing background of all selected item add in your values\style.xml file this

  <item name="selectableItemBackground">@drawable/selectable_item_background</item>

Where selectable_item_background should be declared in drawable/selectable_item_background.xml

  <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@color/accent_translucent"
      android:state_pressed="true" />
    <item android:drawable="@android:color/transparent" />
   </selector>

Where color can be declared in style.xml

 <color name="accent_translucent">#80FFEB3B</color>

And after this

   // The main navigation menu with user-specific actions
        mainNavigationMenu_ = (NavigationView) findViewById(R.id.main_drawer);
        mainNavigationMenu_.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {
                mainNavigationMenu_.getMenu().findItem(itemId).setChecked(true);
                return true;
            }
        });

As you see I used this mainNavigationMenu_.getMenu().findItem(itemId).setChecked(true); to set selected item. Here navigationView

 <android.support.design.widget.NavigationView
        android:id="@+id/main_drawer"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/header_main_navigation_menu"
        app:itemIconTint="@color/state_list"
        app:itemTextColor="@color/primary"
        app:menu="@menu/main_menu_drawer"/>

How to rename a table column in Oracle 10g

SQL> create table a(id number);

Table created.

SQL> alter table a rename column id to new_id;

Table altered.

SQL> desc a
 Name                                      Null?    Type
 ----------------------------------------- -------- -----------
 NEW_ID                                             NUMBER

Regex match digits, comma and semicolon?

word.matches("^[0-9,;]+$"); you were almost there

Detect if checkbox is checked or unchecked in Angular.js ng-change event

You could just use the bound ng-model (answers[item.questID]) value itself in your ng-change method to detect if it has been checked or not.

Example:-

<input type="checkbox" ng-model="answers[item.questID]" 
     ng-change="stateChanged(item.questID)" /> <!-- Pass the specific id -->

and

$scope.stateChanged = function (qId) {
   if($scope.answers[qId]){ //If it is checked
       alert('test');
   }
}

How do I automatically resize an image for a mobile site?

You can use the following css to resize the image for mobile view

object-fit: scale-down; max-width: 100%

Omitting the first line from any Linux command output

ls -lart | tail -n +2 #argument means starting with line 2

CURL Command Line URL Parameters

Felipsmartins is correct.

It is worth mentioning that it is because you cannot really use the -d/--data option if this is not a POST request. But this is still possible if you use the -G option.

Which means you can do this:

curl -X DELETE -G 'http://localhost:5000/locations' -d 'id=3'

Here it is a bit silly but when you are on the command line and you have a lot of parameters, it is a lot tidier.

I am saying this because cURL commands are usually quite long, so it is worth making it on more than one line escaping the line breaks.

curl -X DELETE -G \
'http://localhost:5000/locations' \
-d id=3 \
-d name=Mario \
-d surname=Bros

This is obviously a lot more comfortable if you use zsh. I mean when you need to re-edit the previous command because zsh lets you go line by line. (just saying)

Hope it helps.

List<object>.RemoveAll - How to create an appropriate Predicate

Little bit off topic but say i want to remove all 2s from a list. Here's a very elegant way to do that.

void RemoveAll<T>(T item,List<T> list)
{
    while(list.Contains(item)) list.Remove(item);
}

With predicate:

void RemoveAll<T>(Func<T,bool> predicate,List<T> list)
{
    while(list.Any(predicate)) list.Remove(list.First(predicate));
}

+1 only to encourage you to leave your answer here for learning purposes. You're also right about it being off-topic, but I won't ding you for that because of there is significant value in leaving your examples here, again, strictly for learning purposes. I'm posting this response as an edit because posting it as a series of comments would be unruly.

Though your examples are short & compact, neither is elegant in terms of efficiency; the first is bad at O(n2), the second, absolutely abysmal at O(n3). Algorithmic efficiency of O(n2) is bad and should be avoided whenever possible, especially in general-purpose code; efficiency of O(n3) is horrible and should be avoided in all cases except when you know n will always be very small. Some might fling out their "premature optimization is the root of all evil" battle axes, but they do so naïvely because they do not truly understand the consequences of quadratic growth since they've never coded algorithms that have to process large datasets. As a result, their small-dataset-handling algorithms just run generally slower than they could, and they have no idea that they could run faster. The difference between an efficient algorithm and an inefficient algorithm is often subtle, but the performance difference can be dramatic. The key to understanding the performance of your algorithm is to understand the performance characteristics of the primitives you choose to use.

In your first example, list.Contains() and Remove() are both O(n), so a while() loop with one in the predicate & the other in the body is O(n2); well, technically O(m*n), but it approaches O(n2) as the number of elements being removed (m) approaches the length of the list (n).

Your second example is even worse: O(n3), because for every time you call Remove(), you also call First(predicate), which is also O(n). Think about it: Any(predicate) loops over the list looking for any element for which predicate() returns true. Once it finds the first such element, it returns true. In the body of the while() loop, you then call list.First(predicate) which loops over the list a second time looking for the same element that had already been found by list.Any(predicate). Once First() has found it, it returns that element which is passed to list.Remove(), which loops over the list a third time to yet once again find that same element that was previously found by Any() and First(), in order to finally remove it. Once removed, the whole process starts over at the beginning with a slightly shorter list, doing all the looping over and over and over again starting at the beginning every time until finally no more elements matching the predicate remain. So the performance of your second example is O(m*m*n), or O(n3) as m approaches n.

Your best bet for removing all items from a list that match some predicate is to use the generic list's own List<T>.RemoveAll(predicate) method, which is O(n) as long as your predicate is O(1). A for() loop technique that passes over the list only once, calling list.RemoveAt() for each element to be removed, may seem to be O(n) since it appears to pass over the loop only once. Such a solution is more efficient than your first example, but only by a constant factor, which in terms of algorithmic efficiency is negligible. Even a for() loop implementation is O(m*n) since each call to Remove() is O(n). Since the for() loop itself is O(n), and it calls Remove() m times, the for() loop's growth is O(n2) as m approaches n.

How to Load RSA Private Key From File

You need to convert your private key to PKCS8 format using following command:

openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key_file  -nocrypt > pkcs8_key

After this your java program can read it.

Is it possible to have empty RequestParam values use the defaultValue?

You can set RequestParam, using generic class Integer instead of int, it will resolve your issue.

   @RequestParam(value= "i", defaultValue = "20") Integer i

C++ - Hold the console window open?

How about std::cin.get(); ?

Also, if you're using Visual Studio, you can run without debugging (CTRL-F5 by default) and it won't close the console at the end. If you run it with debugging, you could always put a breakpoint at the closing brace of main().