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I am trying to partially truncate (or shorten) an existing file, using fstream. I have tried writing an EOF character, but this seems to do nothing.
Any help would be appreciated…
I don’t think you can. There are many functions for moving “up and down” the wrapper hierarchy for
HANDLE<->int<->FILE *, at least on Windows, but there is no “proper” to extract theFILE *from an iostreams object (if indeed it is even implemented with one).You may find this question to be of assistance.
Personally I would strongly recommend steering clear of iostreams, they’re poorly designed, heavily C++, and nasty to look at. Take a look at Boost’s iostreams, or wrap stdio.h if you need to use classes.
The relevant function for stdio is ftruncate().