The position of the next I/O operation, which can be either positive
or negative.
iOrigine
the origine used to determined the new file pointer.
Legal values:
SEEK_SET: the pointer is set to iOffset.
SEEK_CUR: the pointer is set to the current position plus
iOffset.
SEEK_END: the pointer is set to the size of the file plus
the value of iOffset.
Returns:
Legal values:
S_OK :on Success.
negative : on failure