I\'m writing an application for the testing team. What this application does is it lets you take a screenshot of any part of the screen (and then it uploads it to testing te
Refer to MSDN for detail about working with multiple monitors:
Multiple Display Monitors
Virtual Screen
Multiple Monitor System Metrics
You can use GetSystemMetrics() with the SM_XVIRTUALSCREEN, SM_YVIRTUALSCREEN,
SM_CXVIRTUALSCREEN, and SM_CYVIRTUALSCREEN metrics to retrieve the rectangle of the entire virtual screen that contains all of the physical screens.