DRVM_IOCTL_DATA

See also DRVM_IOCTL

typedef struct {
    DWORD  dwSize; // size of this structure (inclusive)
    DWORD  dwCmd;  // IOCTL command code
} DRVM_IOCTL_DATA, FAR * LPDRVM_IOCTL_DATA;

Defines codes used by a MIDI throughput driver with the DRVM_IOCTL message.

dwCmd

Driver-specific code used to filter MIDI throughput data. Drivers can use command codes greater than DRVM_IOCTL_CMD_USER and less than DRVM_IOCTL_CMD_SYSTEM. Codes equal to or greater than DRVM_IOCTL_CMD_SYSTEM are reserved for use by the system.