QT : get the class name of an object

I'm writing a test app that simulates key presses of another application. For every key press I have to check if the right window/form is shown. So what I do is get the pointer of the window being shown and get it's window title. However, not all the windows/forms shown window titles. So I'm thinking it would be better to get the name of the class instead. How can I get the name of the class?

QWidget *pWin = QApplication::activeWindow();

when I try:

pWin->className(); 

to get the name of the class, I'm getting:

"error: class QWidget has no member named 'className' "

Can somebody show me the right way?