Closing a MIDI device

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3 total messages Started by George Mitchell Sat, 26 Jul 2003 21:36

#564

Author: George Mitchell
Date: Sat, 26 Jul 2003 21:36

29 lines
1822 bytes

I've got a program that uses the midi multimedia functions to 
communicate with external MIDI instruments. I can open a device
and receive data, but I can't close the device when I'm done.
My first code looked like:

	midiInStop(hMidiIn);
	midiInUnprepareHeader(...);
	midiInClose(hMidiIn);

When I called midiInClose() I got a MIDIERR_STILLPLAYING return
code. A bit of research in the help files revealed that any
input buffers added to the device would cause this return error,
so I modified my code to:

	midiInStop(hMidiIn);
	midiInReset(hMidiIn);

		... wait for my 3 buffers to be returned

	midiInClose(hMidiIn);

If I step through the code, all my buffers are returned, but now
when I call midiInClose() it never returns, and I have to reset
the program. Anyone got any ideas what is going wrong?

Thanks in advance

George

Re: Closing a MIDI device

#565

Author: Maynard Philbrook
Date: Sun, 27 Jul 2003 03:43

39 lines
2278 bytes

Try to use the Disconnect.


George Mitchell wrote:

> I've got a program that uses the midi multimedia functions to
> communicate with external MIDI instruments. I can open a device
> and receive data, but I can't close the device when I'm done.
> My first code looked like:
>
>         midiInStop(hMidiIn);
>         midiInUnprepareHeader(...);
>         midiInClose(hMidiIn);
>
> When I called midiInClose() I got a MIDIERR_STILLPLAYING return
> code. A bit of research in the help files revealed that any
> input buffers added to the device would cause this return error,
> so I modified my code to:
>
>         midiInStop(hMidiIn);
>         midiInReset(hMidiIn);
>
>                 ... wait for my 3 buffers to be returned
>
>         midiInClose(hMidiIn);
>
> If I step through the code, all my buffers are returned, but now
> when I call midiInClose() it never returns, and I have to reset
> the program. Anyone got any ideas what is going wrong?
>
> Thanks in advance
>
> George

--
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Re: Closing a MIDI device

#566

Author: Ted Lyngmo
Date: Thu, 31 Jul 2003 09:28

15 lines
1506 bytes

George Mitchell wrote:
 >
 > If I step through the code, all my buffers are returned, but now
 > when I call midiInClose() it never returns, and I have to reset
 > the program. Anyone got any ideas what is going wrong?

Please post more of your code. Are you using a callback function? You are not 
calling midiInClose() in that, are you?

Kind regards,
Ted Lyngmo

-- 
Replace MY_FIRST_NAME in my email address with my first name to send a private
email to me.

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