Re: question about CoreMIDI & cocoa
Re: question about CoreMIDI & cocoa
- Subject: Re: question about CoreMIDI & cocoa
- From: Robert Grant <email@hidden>
- Date: Tue, 28 Sep 2004 11:42:00 -0400
Now that Kurt Revis has made the spectacularly useful MIDI Monitor
source available I highly recommend you take a look:
http://www.snoize.com/MIDIMonitor/Source/
The long answer is - this topic keeps coming up because the solution is
not as trivial as everyone would like - and thus there is not one right
answer.
Robert.
On Sep 28, 2004, at 10:23 AM, Khamba Staring wrote:
Hi,
Not exactly Core_Audio_ related but here goes.. (is there a coremidi
list?)
I've setup the midi callback so that a standard C function is called
when
a midi message is received by the system. I'd like to make this C
function
signal a method in an ojbc class, in order to let that method update an
NSTextView in my programs window.
Now, the callback is called when a signal is received; it can call a
method
in my MIDI class, which also seems to work (some printf()s showed me).
However, when I try to send a message to the NSTextView outlet from the
method called by the C callback, the program buserrors. I suppose this
happens because the C function lives in the midi thread which is
automatically
created by CoreMIDI?
What can I do to call a function/send a message to the MIDI class so I
can
safely update the NSTextView?
One way I'm trying to avoid is to copy the received midi messages in a
struct
and let the MIDI class periodically check and clear this struct..
Kind regards,
-- Khamba Staring
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