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Re: Sending large sysex dump

On Feb 7, 2005, at 0:02, Peter Karlsson wrote:
The memory area is 100000 bytes, and my dump only 8160 bytes.

It seems to be some kind of limit here. I can send 262 bytes with MIDISend,
if I try to send more then that nothing will be sent. Can someone please
tell me why?

Peter

Below is a quick program I wrote to test this.

I successfully sent a sysex with 384 bytes in the body to the IAC driver and it came back to another test tool's readProc intact.

Does it work for you?

Can you verify with MIDIMonitor that your sysex is making it intact to the driver? (spy on the application output) If it's not getting to the driver, then I'll investigate it further.

If the sysex is getting to the driver, then it's possibly a driver issue -- does your interface have an output activity indicator? Does it look like the interface is receiving and retransmitting the bytes to the device?

While testing this I noticed that MIDIPacketListAdd will not fail if asked to make a packet list larger than 65536 bytes (there are good internal reasons to limit the size of any one contiguous message and it's simple enough to break it up).

Is there a reason you're not using MIDISendSysex?

Doug

- - - - - - - - - - - - - - - - -

#include <CoreMIDI/CoreMIDI.h>

#define kBodySize 384

MIDIPortRef gOutputPort;
MIDIEndpointRef gDestEndpoint;

static void SendBytes(Byte *msg, int len)
{
Byte buffer[kBodySize+16];
MIDIPacketList *pktlist = (MIDIPacketList *)buffer;
MIDIPacket *pkt;

pkt = MIDIPacketListInit(pktlist);
if (pkt == NULL) {
printf("MIDIPacketListInit failed\n");
exit(1);
}

pkt = MIDIPacketListAdd(pktlist, sizeof(buffer), pkt, 0, len, msg);
if (pkt == NULL) {
printf("MIDIPacketListAdd failed; first byte: %02X\n", msg[0]);
exit(1);
}

MIDISend(gOutputPort, gDestEndpoint, pktlist);
}

static MIDIEndpointRef FindDestinationByName(char *destName)
{
CFStringRef pname;
char name[64];
int n = MIDIGetNumberOfDestinations();

for (int i = 0; i < n; ++i) {
MIDIEndpointRef dest = MIDIGetDestination(i);
MIDIObjectGetStringProperty(dest, kMIDIPropertyName, &pname);
CFStringGetCString(pname, name, sizeof(name), 0);
CFRelease(pname);
if (!strcmp(name, destName))
return dest;
}
return NULL;
}

int main (int argc, const char * argv[])
{
MIDIClientRef client;

if (MIDIClientCreate(CFSTR(""), NULL, 0, &client)) {
printf("MIDIClientCreate failed\n");
return 1;
}
if (MIDIOutputPortCreate(client, CFSTR("out"), &gOutputPort)) {
printf("MIDIOutputPortCreate failed\n");
return 1;
}

//gDestEndpoint = MIDIGetDestination(0);
gDestEndpoint = FindDestinationByName("IAC Bus 1");
if (gDestEndpoint == NULL) {
printf("no destination found\n");
return 1;
}

static Byte hdr[] = { 0xF0, 0x0F, 0x02, 0x00, 0x02 };
SendBytes(hdr, sizeof(hdr));

// construct sysex body -- just a series of MIDI data bytes corresponding to the index
Byte *body = new Byte[kBodySize];
for (int i = 0; i < kBodySize; ++i)
body[i] = i & 0x7F;

SendBytes(body, kBodySize);

Byte eox = 0xF7;
SendBytes(&eox, 1);

return 0;
}


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 >RE: Re: Sending large sysex dump (From: "Peter Karlsson" <email@hidden>)



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