MIDIQueryInstanceList - Parameters

ulNumInstances (ULONG) - input

The number of instances to query.

paInstanceInfo (PMIDIINSTANCEINFO) - output

A pointer to an array of MIDIINSTANCEINFO structures containing the instance number, class number, instance name, number of links, and instance attributes. The number of elements in the array is equal to ulNumInstances.

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 paInstanceInfo pointer is invalid or the number of instances (ulNumInstances) is invalid.

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