The following code illustrates how to determine the format name associated with the IOProc.

   MMFORMATINFO mmFormatInfo;
   PSZ pszFormatName;
   USHORT lBytesRead;
   ULONG  ulReserved = 0L;
   ULONG  ulFlags = 0L;
   ULONG  rc;
    ...

   memset( &mmFormatInfo, '\0', sizeof(MMFORMATINFO) );
   mmFormatInfo.lNameLength = 40L;
   mmFormatInfo.fccIOProc = FOURCC_BND;
   mmFormatInfo.ulStructLen=sizeof(MMFORMATINFO);


   rc = mmioGetFormatName( &mmformatinfo,
                           pszFormatName,
                           &lBytesRead,
                           ulReserved,
                           ulFlags);
   if (rc)
     /* error */
   else
    ...