hmmio (HMMIO) - input

      The open file handle returned by mmioOpen.

    pmmioinfo (PMMIOINFO) - input

      A pointer to the MMIOINFO data structure that was filled in by mmioGetInfo.

    usFlags (USHORT) - input

      Specifies options for the operation. Contains one or more of the following flags:

      MMIO_READ

        The buffer is refilled from the file. MMIO_READ is used when the caller has finished reading data from the I/O buffer and wants the buffer to be refilled (if possible).
      MMIO_WRITE
        The buffer is written to the file and not refilled from the file. MMIO_WRITE is used when the caller has written to the end of the buffer and needs the buffer to be emptied (or expanded, in the case of a memory file).

      rc (USHORT) - returns

        Return codes indicating success or type of failure:

        MMIO_SUCCESS

          If the function succeeds, 0 is returned.
        MMIOERR_UNBUFFERED
          The specified file is not opened for buffered I/O.
        MMIOERR_INVALID_HANDLE
          The handle passed was not valid.
        MMIOERR_INVALID_PARAMETER
          An invalid parameter was passed.
        MMIOERR_READ_ONLY_FILE
          A write-advance operation was requested for a read-only file.
        MMIOERR_WRITE_ONLY_FILE
          A read-advance operation was requested for a file opened as write only.
        MMIOERR_WRITE_FAILED
          A write-advance operation failed.
        MMIOERR_READ_FAILED
          A read-advance operation failed.
        MMIOERR_SEEK_FAILED
          A seek operation prior to a write- or read-advance operation failed.
        MMIOERR_NO_FLUSH_NEEDED
          A write-advance operation was requested for the buffer, but the operation was not required.
        MMIOERR_OUTOFMEMORY
          An advance operation requires a buffer.
        MMIOERR_CANNOTEXPAND
          Unable to expand a MEM file for an advance request.
        MMIOERR_FREE_FAILED
          Unable to free a buffer after expanding a MEM file.

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