How to start the log file when key combinations pressed??

[Gokulnathvc]

how to start the log file when CTRL+ALT+T is pressed and if it presssed again it should stop.... how it can be done...

[wysota]

What is it exactly that you don't know how to implement?

[Gokulnathvc]

I want to start the log file creation when CTRL+ALT+L is presssed and have to stop it when the same combination has been clicked.. please help me..

[wysota]

I understand what you want, I'm asking what are you having problems with? Tell us what you have already tried and what didn't work.

[Gokulnathvc]

void QCDevice::keyPressEvent(QKeyEvent *event)
{
    if (event->key() == Qt::Key_Control && Qt::Key_Alt && Qt::Key_V) {
 
        QMessageBox::warning(NULL,"Keypress","Keypressed",QMessageBox::Ok);
    }
 
    I have tried this one, but after pressing the key combination also the message box is not shown..
 
}

void QCDevice::keyPressEvent(QKeyEvent *event)
{
    if (event->key() == Qt::Key_Control && Qt::Key_Alt && Qt::Key_V) {

        QMessageBox::warning(NULL,"Keypress","Keypressed",QMessageBox::Ok);
    }
    
    I have tried this one, but after pressing the key combination also the message box is not shown..

}

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[wysota]

Is QCDevice a widget?

[Gokulnathvc]

No its a dialog

[wysota]

A dialog is also a widget Ok, does it have keyboard focus?

Furthermore your code is incorrect:

if (event->key() == Qt::Key_Control && Qt::Key_Alt && Qt::Key_V)

if (event->key() == Qt::Key_Control && Qt::Key_Alt && Qt::Key_V)

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this can be translated to:

if(event->key() == Qt::Key_Control && 0x01000023 && 0x56)

if(event->key() == Qt::Key_Control && 0x01000023 && 0x56)

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which again translates to:

if(event->key() == Qt::Key_Control && true && true)

if(event->key() == Qt::Key_Control && true && true)

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and then to:

if(event->key() == Qt::Key_Control)

if(event->key() == Qt::Key_Control)

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which as you probably guess is not what you want. Read what QKeyEvent::key() is and use it with conjunction with QKeyEvent::modifiers(). Or just use QShortcut.

Learning a bit more C++ wouldn't hurt either.

[Gokulnathvc]

How to perform those key combinations in it?? please help me with the above codes.

[wysota]

What didn't you understand from my previous post? Make sure you widget accepts focus, use QKeyEvent::key() in conjunction with QKeyEvent::modifiers() or use QShortcut. If you expect me to provide full working code then that's not going to happen, I rarely do that in the Newbie forum. And please correct your profile information, somehow I doubt you're using Qt3 or Qt/Embedded.

[ChrisW67]

please help me with the above codes.

You are using logical AND where you want bit-wise AND.

http://en.wikipedia.org/wiki/Operato...ical_operators

[Gokulnathvc]

I have solved that

if ((event->type()==QEvent::KeyPress) && (event->modifiers() & Qt::ControlModifier) &&
        (event->modifiers() & Qt::AltModifier)&& (event->key()==Qt::Key_L))
    {
        QMessageBox::warning(NULL,"keypress","key pressed",QMessageBox::Ok);
 
    }

if ((event->type()==QEvent::KeyPress) && (event->modifiers() & Qt::ControlModifier) &&
        (event->modifiers() & Qt::AltModifier)&& (event->key()==Qt::Key_L))
    {
        QMessageBox::warning(NULL,"keypress","key pressed",QMessageBox::Ok);

    }

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[Gokulnathvc]

The above code works fine in xp .. But it Fails in windows 7.. please help me

[Gokulnathvc]

In window 7 even the key press event is not called... please help me in fixing this...

[wysota]

Does the widget accept keyboard focus?

[Gokulnathvc]

No. it is not accepting it. but it works good in xp

[wysota]

No. it is not accepting it.

So it won't handle key events.

[Gokulnathvc]

Whether it can be applied using the dialogs instead

[wysota]

Whether it can be applied using the dialogs instead

I have no idea what you mean.

[Gokulnathvc]

Is it possible to apply the key press events for the dialog based applications???