Just to point out that there was a similar discussion thread here - Opening a file at a designated offset based on closing of the file, posted on 11th November 2003. It might be worthwhile to go through its responses.

Your solution works, provided that you never trim, rotate, reset your log file. I have posted a more reliable solution in the discussion mentioned above.

In reply to Re: Using Seek to read and parse growing log files by Roger
in thread Using Seek to read and parse growing log files by Anonymous Monk

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