Detecting a desktop switch

[Ryan Binns]

Does anyone know of a way of detecting when a desktop switch has occurred? I'm not talking about terminal servies (WM_WTSSESSION_CHANGE will do that), but a simple single-user desktop switch. There's an API to do the switch (SwitchDesktop()), but there doesn't seem to be any way of detecting that it has occurred when someone else does the switch. I've used Spy++ to look at every single message sent to my app while I do a switch, and there doesn't seem to be anything unusual, just a bunch of WM_ACTIVATE, WM_ACTIVEAPP, WM_WINDOWPOSCHANGING (but not WM_WINDOWPOSCHANGED however) messages. Nothing extraordinary there. The only thing I saw I wasn't expecting was that the cx and cy fields in the WINDOWPOS structure were both set to -1, although SWP_NOSIZE was also set, so they would be ignored anyway.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"