QT getting the screen resolution without the extended monitor

Question

QDesktopWidget desktop;

int desktopHeight=desktop.geometry().height();
int desktopWidth=desktop.geometry().width();
this->resize(desktopWidth,desktopHeight);

for example my main monitor resolution is 1024 x 768 and my extended monitor resolution is 800x600. the value i get from desktop height and width is the sum of the two monitor resolution. i only need to get the main monitor resolution. can somebody tell me how? thanks. I'm using qt 4.7.3

edit: I'm using dual screen, particularly in cashier ordering the main monitor is seen by the cashier and the extended are seen by the costumer.

Answer 1

You pretty much had it, just give the screen ID of your main monitor to the geometry() call.

QDesktopWidget widget;
QRect mainScreenSize = widget.availableGeometry(widget.primaryScreen()); // or screenGeometry(), depending on your needs