MIDIDisableInstance Return Value - rc

rc (ULONG) - returns

Returns 0 if the command is completed successfully.

MIDIERR_HARDWARE_FAILED

The disable or close attempt failed due to a hardware problem.
MIDIERR_INTERNAL_SYSTEM
System problem.
MIDIERR_INVALID_FLAG
The ulFlag value is invalid.
MIDIERR_INVALID_INSTANCE_NUMBER
The instance number (minstance) is invalid.
MIDIERR_NOT_ALLOWED
Both send and receive are not permitted for this particular instance.
MIDIERR_RECEIVEONLY
An attempt was made to disable an instance for send (or for send and receive) when the instance supports receive only.
MIDIERR_SENDONLY
An attempt was made to disable an instance for receive (or for send and receive) when the instance supports send only.

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