GUID for the interface device class ??

在ntddstor.h里有下面的定义，其他设备类型的怎么得到？？
#define DiskClassGuid               GUID_DEVINTERFACE_DISK
#define CdRomClassGuid              GUID_DEVINTERFACE_CDROM
#define PartitionClassGuid         GUID_DEVINTERFACE_PARTITION
#define TapeClassGuid               GUID_DEVINTERFACE_TAPE
#define WriteOnceDiskClassGuid      GUID_DEVINTERFACE_WRITEONCEDISK
#define VolumeClassGuid             GUID_DEVINTERFACE_VOLUME
#define MediumChangerClassGuid      GUID_DEVINTERFACE_MEDIUMCHANGER
#define FloppyClassGuid             GUID_DEVINTERFACE_FLOPPY
#define CdChangerClassGuid          GUID_DEVINTERFACE_CDCHANGER
#define StoragePortClassGuid        GUID_DEVINTERFACE_STORAGEPORT