Another Endpoint Q
Another Endpoint Q
- Subject: Another Endpoint Q
- From: Andy <email@hidden>
- Date: Fri, 6 Sep 2002 23:21:33 +0100
I must say I feel very sad and lonely when no-one answers my Qs ;)
I have another Endpoint related question ...
In a MIDI driver interface, there's a function named
MIDIDriverEnableSource (MIDIEndpointRef src, Boolean enabled),
This passes an EndpointRef and a boolean flag.
The documentation and headers are unclear, but it appears that the
endpoint ref (src) I'm receiving here does not correspond to any that
my driver created on its own ports.
Is that right, is it referring to an external connection ie the
endpoint that is on the other end of the ("virtual") line.
Is it a bug ? In my code or CA ?
What should/does this EndpointRef refer to ?
Here's a code extract ...
elsewhere in the code endpoints are created and refcons are set using
MIDIEndpointSetRefCons()
also elsewhere I extract the endpoint refcons and use them
successfully, but when I receive this notification ...
void ClientNotifyProc(const MIDINotification * message, void *refCon)
{
switch ( message->messageID ) {
...
case kMIDIMsgObjectRemoved :
{
MIDIObjectAddRemoveNotification * marn =
(MIDIObjectAddRemoveNotification *) message;
if ( marn->childType == kMIDIObjectType_Source ) {
// child = source endpoint
// parent = port that owns endpoint
printf("MIDI SOURCE REMOVED FROM SETUP parent = X, child =
X\n", (int)marn->parent, (int)marn->child);
void * ref1 = 0;
void * ref2 = 0;
USBDevice * usbDevice;
OSStatus err =
MIDIEndpointGetRefCons((MIDIEndpointRef)marn->child, &ref1, &ref2);
printf("endpoint rc's 1 = X, 2 = X, err = %d\n",
(int)ref1, (int)ref2, (int)err);
}
}
break;
}
}
console output is this ...
MIDI SOURCE REMOVED FROM SETUP parent = 09810012, child = 09810013
endpoint rc's 1 = 00000000, 2 = 00000000, err = -50
Parent and Child values correspond to port and endpoint that were
created earlier on.
Why the -50 error, (param error ?)
Is it because the endpoints have already been destroyed and the
MIDIEndpointRef (marn->child) is no longer valid ?
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