I'm trying to use the SetExternalMidiReadCallback() function but for
some reason the userData variable in my callback function keeps
returning null. Here's a snippet of the calback function:

int Cabbage::ReadMidiData(CSOUND *csound, void *userData,
unsigned char *mbuf, int nbytes)
{
Cabbage *midiData = (Cabbage *)userData;
if(!userData){
cout << "\n\nInvalid";
return 0;
}
etc....

It keeps spitting out invalid, and I can't see why. I set the callback
functions just after a precompile and before the full compile like
this:

  csound->PreCompile();
  csound->SetExternalMidiInOpenCallback(OpenMidiDevice);
  csound->SetExternalMidiReadCallback(ReadMidiData);
 csound->Compile(".....

Can anyone think of anything I can check to see what the problem is?
I'm at sea a little with this...

Rory.

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