How to decipher EventRef object to get keycode from a keypress?

Hello,

I am making a Qt application and want to intercept keypresses at a deeper level. To do this I overrided the QWidget::macEvent() function to intercept the EventRef object.

For different events (i.e. keyboard events, mouse events, window events) EventRef is equal to the following values:

0x104d649f0

0x101425740

0x104d649f0

0x101485950

0x101425740

0x101485950

How can I tell if the event is a keyboard event? And how can I find out which key was pressed?