RestoreGeometry() with multi-monitor configuration - c++

Question

I have a QMainWindow and wish to remember its size and position on the screen.
This I can do with saveGeometry(), to save the settings to a .ini file and restoreGeometry() - to restore the window.
However, what will be the behaviour of the Window on a multiscreen setup?
Is it possible for the Window to be launched on the correct calling window, and with its size and position on that window remembered?
In my current implementation, I have taken care of the launch of the application where the mouse pointer currently is, but the window is always full screen, unless someone sets the position manually in the ini file.
int posX = cSfcConfig::getProperties(MAIN_WINDOW, POS_X).toInt();
int posY = cSfcConfig::getProperties(MAIN_WINDOW, POS_Y).toInt();
QByteArray locationArray = cSfcConfig::getLocationSetting();
if ( posX > 0 || posY > 0)
{
QRect rect = QDesktopWidget().availableGeometry();
QDesktopWidget *m=new QDesktopWidget();
QPoint p= QCursor::pos();
int r= m->screenNumber(p);
QRect d=m->screenGeometry(r);
//QPoint l = d.();
int width = rect.width() - (posX * 2);
int height = rect.height() - posY;
//mainWindow.restoreGeometry(locationArray);
//mainWindow.restoreState(cSfcConfig::GetStateSetting());
mainWindow.setGeometry(posX, posY, width, height);
mainWindow.show();
mainWindow.move(l);
}
else
{
mainWindow.showMaximized();
}