GetActiveWindow always fails

[Pohoda]

Hi, I tried to read as most topics here as I could, but still haven't found the answer. I try to get handle of PowerPoint from my applivation. PowerPoint has different titles (depending on opened file), so I can't use FindWindow. I also tried EnumWindows, but didn't work (probably my mistake). I have console application and in my situation, it doesn't matter on time when I switch PowerPoint to be active. After PowerPoint is active, I start manualy sending WM_KEYDOWN messages over serial port. Most easy way for me can be something like this:

HWND prog = GetActiveWindow();
if (!prog) printf("next time...");

I can't understand why, but "next time..." appears every time, doesn't matter on which window is active. Any ideas what I'm doing wrong?

[Calculator]

http://msdn.microsoft.com/library/de...tivewindow.asp

GetActiveWindow Function

The GetActiveWindow function retrieves the window handle to the active window attached to the calling thread's message queue.

...

Remarks

To get the handle to the foreground window, you can use GetForegroundWindow.

So, the GetActiveWindow function will fail if it is a console, but it doesn't matter because that probably isn't the API you wanted in the first place.

[Pohoda]

Thank you... when I use GetForegroundWindow(), no error appears. After few hours of searching, I didn't see my fault. When I send message to my "help" programm, in which I defined WM_KEYDOWN and VK_DOWN, everything works exactly as I want. But when I send the same message and PowerPoint is active, nothing happens :-( (I need next slide)

PostMessage(prog, WM_KEYDOWN, VK_DOWN, NULL);

[Calculator]

I would dok something more like, when you want to change a slide, getforegroundwindow (error check: if window class of foreground window == window class of power point), then use sendinput/keybd_event to synthesize a down keystroke (instead of wm_keydown).

http://msdn.microsoft.com/library/de.../sendinput.asp
http://msdn.microsoft.com/library/de...eybd_event.asp

[pengch]

I think using PowerPoint COM interface is the right way.