The following code illustrates how to get information about a file.

   HMMIO hmmio1;
   MMIOINFO mmioinfo;
   USHORT usFlags = 0;
   USHORT rc;
    ...

   memset( &mmioinfo, '\0', sizeof(MMIOINFO) );

   rc = mmioGetInfo( hmmio1, &mmioinfo, usFlags);
   if (rc)
     /* error */
   else
    ...