MIDIQueryClassList - Parameters

ulNumClasses (ULONG) - input

Number of classes.

paClassInfo (PMIDICLASSINFO) - output

Pointer to an array of MIDICLASSINFO structures containing the class number and corresponding class name for each class. The number of elements in the array is equal to the ulNumClasses value.

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_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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