writing back to the file

I am trying to write back to the beginning of a file using the following:

Code:

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outfile.open(fileName, ios::in|ios::nocreate)

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Yes it writes to the beginning of the file but it seems to overwrite some of the information already there. How can I prevent this from occuring.

You can't just insert new data at the beginning of a file. Naturally anything you write will overwrite what's already there. If you want to insert something at the beginning of a file then you'll need to either use a dynamic data structure in memory to work with the file, or write what you want to a temporary file, then append the contents of the file to the temporary, then copy the temporary back to the original file.

:eek: Ohhh

Thanx for that. Had no idea that was the case