MIDIQueryNumClasses - Parameters

pulNumClasses (PULONG) - output

The number of node classes.

ulFlag (ULONG) - input

This parameter is not currently used and must be set to 0.

rc (ULONG) - returns

Returns 0 if the command is completed successfully.

MIDIERR_INTERNAL_SYSTEM

System problem.
MIDIERR_INVALID_FLAG
The ulFlag value is not set to 0.
MIDIERR_INVALID_PARAMETER
The pulNumClasses pointer is invalid.

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