The MMCKINFO Data Structure

Several multimedia file I/O functions use the MMCKINFO structure to specify and retrieve information about a chunk in a RIFF file. The MMIOOS2.H header file defines the MMCKINFO structure as as shown.

typedef struct _MMCKINFO {   /* mmckinfo                              */
  FOURCC      ckid;          /* Chunk id (FOURCC)                     */
  ULONG       ulSize;        /* Chunk size (bytes)                    */
  FOURCC      fccType;       /* FOURCC type (if ckid RIFF or LIST)    */
  ULONG       ulDataOffset;  /* File offset of data portion of chunk  */
  ULONG       ulFlags;       /* MMIO_DIRTY (if new chunk)             */
} MMCKINFO;