Re: Is EnableWindow(HWND, BOOL) thread safe ?

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"Mike J" <notvalid@xxxxxxxxx> wrote in message
news:%23CxDp0EEGHA.3200@xxxxxxxxxxxxxxxxxxxxxxx
> Does these API block the thread ?
> ChildWindowFromPoint(HWND, POINT)
> IsWindowEnabled(HWND)

I don't know. My guess would have been 'no' for both but in scanning the
documentation for ChildWindowFromPoint(), there is a discussion of how it
treats transparent portions of a window. It may be that Windows is sending
WM_NCHITTEST messages to windows surrounding the point. If that's so, you
could block on a send. You might want to run Spy++.

> Suppose they are blocked, and I use PostMessage, but I still need to wait
> to get the state of the Window. Or let the HWND's thread manages its own
> state, and PostMessage back to the calling thread.

Check the docs for SendMessageCallback() to see if it would help you.

Just by the way, you might want to start a new thread in a UI group, e.g.

microsoft.public.win32.programmer.ui

with a question on what you want to do and not how to do. That is often a
way to get the best advice.

Regards,
Will




.

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