MIDIQueryNumClasses - Syntax

This function returns the number of node classes currently registered.

#include <mididll.h>

PULONG    pulNumClasses;  /*  Number of node classes. */
ULONG     ulFlag;         /*  Not used. */
ULONG     rc;             /*  Return code. */

rc = MIDIQueryNumClasses(pulNumClasses, ulFlag);