AutoHotkey Community

Hi,
I have a script monitoring WM_KEYDOWN events, and I would like to discard the message so that no key is actually sent to the window (under certain conditions).
It's likely that I may also have to monitor and discard WM_KEYUP events.
Does anyone know of a way to do this?
Thanks!

Don't know if this help but from the help of OnMessage:
What the Function Should Return
For example, a function monitoring WM_LBUTTONDOWN (0x201) may return an integer to prevent the target window from being notified that a mouse click has occurred. In many cases (such as a message arriving via PostMessage), it does not matter which integer is returned; but if in doubt, 0 is usually safest.

From MSDN info for WM_KEYDOWN message,I did try to return 1 instead of 0 already, but noticed that it only worked for certain keys (WM_CHAR messages are not generated any more) but kept sending others like win keys or mute key.
I used Winspector Spy and was able to notice that some keys (volume_mute, media_next, media_prev, ...) sent a WM_APPCOMMAND message. Discarding this message prevented the key strokes.

As for win keys, it seems I will have to find some workaround, as I could not find a message to discard.