The following code illustrates how to seek within a file.

   HMMIO hmmio1;
   LONG lOffset;
   LONG lOrigin = 0L;
   LONG lFilePosition;
    ...

   lOffset = 0L;
   lOrigin |= SEEK_END;

   lFilePosition = mmioSeek(hmmio1, lOffset, lOrigin);

   if (lFilePosition < 0L)
     /* error */
   else
    ...