I need to get the status of Caps-lock on or off in QT framework using c++

MikeXing

Hi All,

I need to get the status of 'caps-lock' key is on or off in QT framework.

Suppose if the caps-lock key is on in the keyboard before running any application. I want to read the status of caps-lock key from the keyword using QT framework.

It would be great if someone helps me in this query.

Thanks & Regards,

Mike

J.Hilk

@MikeXing
you'll most likly need an OS-specific libary.

In Windows, for example, you could go with

"WinUser.h" include and use GetKeyState with the VK_CAPITAL key code

MikeXing

Thank you for your reply....
But i want to do it in linux using QT framework.

Regards,
Mike

JonB

@MikeXing
If @J-Hilk is right, and you can't just use Qt to determine this, have a look at http://www.qtcentre.org/threads/30180-how-to-determine-if-CapsLock-is-on-crossplatform or https://stackoverflow.com/questions/9830905/qt-4-7-4-is-there-a-way-to-find-out-the-status-of-caps-lock

MikeXing

Another way is i can make forcefully set the caps-lock key to off how do i do it?

Even though if the caps-lock key is on in the beginning of application, if i could make it forcefully to off my problem will be solved.
So how do i forcefully make caps-lock key off?

Regards,
Mike

J.Hilk

@MikeXing
Technically still with os specific functions.

but in this special case you could also use an eventfilter and retranslate alle uppercase Keys into a lower case one.

e.g: (untested)

bool eventFilter(QObject* obj, QEvent* event)
    {
        if (event->type()==QEvent::KeyPress) {
            QKeyEvent* key = static_cast<QKeyEvent*>(event);
             Qt::KeyboardModifiers modifieres = key->modifiers();
            modifieres.setFlag(Qt::ShiftModifier, false);
            key->setModifiers(modifieres);
            return QObject::eventFilter(obj,key);
        } else {
            return QObject::eventFilter(obj, event);
        }
        return false;
    }

MikeXing

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