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Article View: borland.public.cppbuilder.multimedia
Article #198

CALLBACK_THREAD

#198
From: Isaac
Date: Tue, 27 May 2008 13:57
46 lines
2002 bytes
Hi,

I'm experimenting with digital audio (hobby of mine).
I can play/record with code made for a single executable
application using CALLBACK_WINDOW and message maps.
Absolutely no problems there.

I'd like to write up a self-contained separate thread for
playback (and another one for record) -- no calling of other
threads etc -- everything in the one playback/record thread,
however, I can't seem to make the following code work.

In the implementation file I have:

	waveOutOpen(&WaveHandle,
                    WAVE_MAPPER,
                    &WaveFormat,
                    (double)ThreadID,
                    (double)this,
                    CALLBACK_THREAD)

	.......

and the following in the header file:

	BEGIN_MESSAGE_MAP
	   MESSAGE_HANDLER(MM_WOM_DONE, TMessage, OnWaveMessage)
	END_MESSAGE_MAP(TThread)


Also tried the following with no joy.

	BEGIN_MESSAGE_MAP
	   MESSAGE_HANDLER(WOM_DONE, TMessage, OnWaveMessage)
	END_MESSAGE_MAP(LineOut)


It plays (or records) OK, but it's like messages aren't being handled.
OnWaveMessage doesn't get called at all.

What am I missing?

Thanks in advance for any assistance.

Isaac
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