Apple

On Sat, Jun 18, 2011 at 6:29 PM, Eric Kampman <email@hidden> wrote:

I'm out of ideas. In my test setup MidiKeys can play my external synth. No CoreMIDI code I've written can. The 'MIDI Out' led on my M-Audio Uno flashes at the right moments but no sound. Below is bare-bones code that cycles through the possible destinations and does a note down and an un-note down once a second. Can anyone see what I'm doing wrong?

#import <Foundation/Foundation.h>
#include <CoreAudio/CoreAudio.h>
#include <CoreMIDI/CoreMIDI.h>

//#include <time.h> /* nanosleep */
//#include <stdio.h> /* printf */

MIDIPortRef gOutPort = 0;

Byte data_dn[] = { 0x90, 0x29, 0x80 };

Byte data_up[] = { 0x90, 0x29, 0x00 };

static OSStatus sendOnOff(MIDIEndpointRef endpointRef)

{
MIDITimeStamp timeStamp = 0; // AudioGetCurrentHostTime();

MIDIPacketList mpl;

MIDIPacket *mp;

OSStatus ret = 0;

struct timespec waitime = { 1, 0 };

mp = MIDIPacketListInit(&mpl);
mp = MIDIPacketListAdd(&mpl, sizeof(mpl), mp, timeStamp,
3, data_dn);
ret = MIDISend(gOutPort, endpointRef, &mpl);

nanosleep(&waitime, NULL);

waitime.tv_sec = 1;

mp = MIDIPacketListInit(&mpl);

mp = MIDIPacketListAdd(&mpl, sizeof(mpl), mp, timeStamp,

3, data_up);
ret = MIDISend(gOutPort, endpointRef, &mpl);
nanosleep(&waitime, NULL);

return ret;

}

int main (int argc, const char * argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

MIDIClientRef client = 0;

MIDIClientCreate(CFSTR("MIDI Test"), NULL, NULL, &client);

MIDIOutputPortCreate(client, CFSTR("Output Port"), &gOutPort);

ItemCount count = MIDIGetNumberOfDestinations();

bool finished = NO;

MIDIEndpointRef dest;

CFStringRef pname;

char name[64];

while (!finished) {

for (int i = 0; i < count; i++) {

dest = MIDIGetDestination(i);

MIDIObjectGetStringProperty(dest, kMIDIPropertyName, &pname);

CFStringGetCString(pname, name, sizeof(name), 0);

printf("Dest Endpoint Ref = %u\n", dest);

printf("Sending note on/off to '%s'\n", name);

sendOnOff(dest);

}
}

[pool drain];
return 0;
}

FWIW Snow Leopard, 10.6.7.
Thanks
Eric

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References:
	>MIDI In OK, No MIDI Out (From: Eric Kampman <email@hidden>)