This function modifies information that is stored in the compound-file table of contents (CTOC) header of an open RIFF compound file.

#define INCL_MMIOOS2
#include <os2.h>

HMMCF        hmmcf;      /*  RIFF file handle. */
PMMCFINFO    pmmcfinfo;  /*  Pointer to MMCFINFO. */
ULONG        cBytes;     /*  Max # of bytes. */
ULONG        rc;         /*  Return codes. */

rc = mmioCFSetInfo(hmmcf, pmmcfinfo, cBytes);