mmioWrite Return Value - rc

rc (LONG) - returns

Returns the number of bytes actually written. If an error occurs, MMIO_ERROR is returned. A call to mmioGetLastError might return one of the following errors:

MMIOERR_READ_ONLY_FILE

File not opened in WRITE mode.
MMIOERR_INVALID_HANDLE
Invalid handle specified.
MMIOERR_WRITE_FAILED
Unable to write; probable hardware error.
MMIOERR_SEEK_FAILED
Unable to seek; probable hardware error.
MMIOERR_READ_FAILED
Unable to read; probable hardware error.
MMIOERR_INVALID_BUFFER_LENGTH
The buffer length is invalid.
MMIOERR_NO_BUFFER_ALLOCATED
A buffer was expected but none was found.
MMIOERR_CANNOTWRITE
The target media has no space available.

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