Opening a file without overwriting it!

[robbiegregg]

Hi

I have been searching for a solution for this for ages but could not find anything:

I have a binary file which I want to open and modify a value. However when I use something like:

ofstream outfile(filename,ios:ut|ios::binary);

the code overwrites the file.

What should I be using so I don't overwrite the existing file?

I am using Visual C++ v6.

Cheers

Robbie

[Philip Nicoletti]

Add ios::in .. that will prevent file truncation (but the file must exist).
Then seekp() to the spot you want to overwrite.

ofstream outfile(filename,ios::in|ios::out|ios::binary);

[wildfrog]

You could use the ios::app mode if you want to append data to the end of an existing file.

- petter

[robbiegregg]

Cheers Philip, I will try that tonight.

[harrypotter28685]

use

ios::app...

That shud solve your problem..