MIDIQueryClassList Return Value - rc

rc (ULONG) - returns

Returns 0 if the command is completed successfully.

MIDIERR_INTERNAL_SYSTEM

System problem.
MIDIERR_INVALID_CLASS_NUMBER
The ulNumClasses value is 0 or exceeds the number of classes.
MIDIERR_INVALID_FLAG
The ulFlag value is not set to 0.
MIDIERR_INVALID_PARAMETER
The paClassInfo pointer is invalid.

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