rc (LONG) - returns

      Returns the number of bytes actually read. If no more bytes can be read because the end of file has been reached, 0 is returned. If an error occurs, MMIO_ERROR is returned. A call to mmioGetLastError might return one of the following errors:

      MMIOERR_WRITE_ONLY_FILE

        File not opened in Read mode.
      MMIOERR_READ_FAILED
        Unable to read; probable hardware error.
      MMIOERR_WRITE_FAILED
        Writing to a full buffer before trying to read the next buffer failed.
      MMIOERR_SEEK_FAILED
        Unable to seek; probable hardware error.
      MMIOERR_INVALID_BUFFER_LENGTH
        The buffer length is invalid.
      MMIOERR_NO_BUFFER_ALLOCATED
        Write operation expected a buffer but none was allocated.

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