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8.2

Find handle of previous active window (win32)

Asked by cto in Windows Programming

I'm trying to write a small win32 application (in C or C++)  that sends pre-cooked keystrokes to another application. The user experience should be this:

The user works with application X (which can be anything), then uses the mouse to click somewhere in the window belonging to application Y (written by me), which is visible on the screen. Application Y uses SendInput to send keystrokes to application X.

The problem is: SendInput sends keystrokes to the foreground window. How can application Y determine which window was the foreground window immediately before it received the mouse click?

Back in 1997, someone asked a similar question here (http://www.experts-exchange.com/Programming/System/Windows__Programming/Q_10010231.html), and the answer was to look at the wparam of the WM_SETFOCUS message. However,  the answer was later withdrawn (and in Vista that parameter appears to always be 0). One of the last comments on the question from 1997 says: "It seems there is no way to obtain handle of deactivated window."

Is that really true?
[+][-]07/04/09 07:22 AM, ID: 24776987Accepted Solution

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Zone: Windows Programming
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Solution Provided By: JohnGaby
Participating Experts: 2
Solution Grade: A
 
[+][-]07/04/09 07:27 AM, ID: 24776997Assisted Solution

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[+][-]07/04/09 10:46 AM, ID: 24777462Author Comment

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