Qt LEFT CTRL Key Code

There is no way to do this using pure Qt methods, as far as I know.

Depending on your platform, however, you might be able to distinguish between the keys using the QKeyEvent::nativeScanCode() method instead of QKeyEvent::key().

For example, on Windows you should be able to test which Ctrl key was pressed as follows:

if (event->nativeScanCode() == VK_LCONTROL) {
  // left control pressed
} else if (event->nativeScanCode() == VK_RCONTROL) {
  // right control pressed
}