typedef OSErr(* SGDataProcPtr) (
    SGChannel c, 
    Ptr p, 
    SInt32 len, 
    SInt32 *offset, 
    SInt32 chRefCon, 
    TimeValue time, 
    SInt16 writeType, 
    SInt32 refCon
);

You would declare your function like this if you were to name it MySGDataCallback:

OSErr MySGDataCallback (
    SGChannel c, 
    Ptr p, 
    SInt32 len, 
    SInt32 *offset, 
    SInt32 chRefCon, 
    TimeValue time, 
    SInt16 writeType, 
    SInt32 refCon
);

function result

A result code.

© 2000 Apple Computer, Inc. (Last Updated 6/26/2000)