typedef enum _CALLBACK_NUMBER {
  CN_FILE_TREE_PROGRESS_ADD = 0,
  CN_FILE_TREE_PROGRESS_REMOVE,
  CN_FILE_TREE_PROGRESS_IGNORE,
  CN_FILE_TREE_PROGRESS_NAME_COLLISION,
  CN_TARGET_FILE_ANALYZE_BEGIN,
  CN_TARGET_FILE_ANALYZE_END,
  CN_WAIT_CACHE_FULL_BEGIN,
  CN_WAIT_CACHE_FULL_END,
  CN_SYNCHRONIZE_CACHE_BEGIN,
  CN_SYNCHRONIZE_CACHE_END,
  CN_FIND_DEVICE,
  CN_CDVD_READ_PROGRESS,
  CN_CDVD_WRITE_PROGRESS,
  CN_CDVD_BUFFER_STATUS,
  CN_CDVD_TRACK_BEGIN,
  CN_CDVD_TRACK_END,
  CN_CDVD_SPLIT_BEGIN,
  CN_CDVD_SPLIT_END,
  CN_CDVD_READ_BAD_BLOCK_HIT,
  CN_CDVD_READ_ECCEDC_BAD_BLOCK_HIT,
  CN_CDVD_READ_RETRY,
  CN_DVDPLUSRW_FORMAT_BEGIN,
  CN_DVDPLUSRW_FORMAT_END,
  CN_DVDRAM_FORMAT_BEGIN,
  CN_DVDRAM_FORMAT_END,
  CN_BUFFER_UNDERRUN,
  CN_DVD_MEDIA_PADDING_SIZE,
  CN_DVD_MEDIA_PADDING_BEGIN,
  CN_DVD_MEDIA_PADDING_END,
  CN_CDVD_READ_CANCEL_QUERY,
  CN_DVDRW_QUICK_FORMAT_BEGIN,
  CN_DVDRW_QUICK_FORMAT_END,
  CN_DVD_TEST_WRITE_DISABLED,
  CN_CDVD_DPM_BEGIN,
  CN_CDVD_DPM_END,
  CN_CDVD_DPM_PROGRESS,
  CN_CDVD_VERIFY_PROGRESS,
  CN_SAO_TRACK_WRITE_BEGIN,
  CN_SAO_TRACK_WRITE_END,
  CN_DVD_MEDIA_PADDING_WRITE_PROGRESS,
  CN_CDVD_WRITE_BEGIN,
  CN_CDVD_WRITE_END,
  CN_CDVD_VERIFY_BEGIN,
  CN_CDVD_VERIFY_END,
  CN_BDRE_FORMAT_BEGIN,
  CN_BDRE_FORMAT_END
} * PCALLBACK_NUMBER, CALLBACK_NUMBER;