This function provides a list of all I/O procedures available for use.

#define INCL_MMIOOS2
#include <os2.h>

PMMFORMATINFO    pmmformatinfo;    /*  Pointer to MMFORMATINFO structure. */
LONG             lNumFormats;      /*  Number of formats. */
PVOID            pFormatInfoList;  /*  Pointer to memory-allocated structure. */
PLONG            plFormatsRead;    /*  Number of formats read. */
ULONG            ulReserved;       /*  Reserved. */
ULONG            ulFlags;          /*  Reserved. */
ULONG            rc;               /*  Return codes. */

rc = mmioGetFormats(pmmformatinfo, lNumFormats,
       pFormatInfoList, plFormatsRead, ulReserved,
       ulFlags);