Dan's comments make perfect sense. Unfortunately the keystrokes approach doesn't work either, no doubt for the same reason. It looks like that's the just the way things are with RDP.
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SendInput fails with Remote Desktop when minimized/disconnected
I've written a program (C++/MFC) that automates certain mouse and keyboard operations. It works perfectly on all systems I've tested against and when running on a machine accessed via remote desktop - UNTIL the remote desktop window is closed or minimized. At that point the actions submitted via SendInput just seem to be ignored by the OS. I've also seen comments from other developers that things like GetCursorPos also fail in the same situation.
Can anybody fill me in on why this is happening, and hopefully suggest a possible workaround?
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by: DanRollinsPosted on 2009-10-27 at 20:31:18ID: 25679761
I would expect that behavior. Remote access systems ar designed to avoid unnecessary network traffic. Just as an image is "clipped" when it is covered by another window, I would assume that actions are "clipped" as well when they cannot apply to the target program.
You could test the theory: Resize or move the target window until a control, such as an OK button, is no longer visible. I would expect that SendInput of a mouse click would no longer be able to cause that button to be clicked.
The workaround might be to send keystrokes rather than mouse clicks. In almost every Windows application, there is a keystroke method to invoke every command.
As to minimized windows... Programs often behave differently when minimized. For instance, here is no reason to paint complex graphics if the window is just a taskbar icon.