Re: [Boost-users] [filesystem] how to set a file size?

Subject: Re: [Boost-users] [filesystem] how to set a file size?
From: Roland Bock (rbock_at_[hidden])
Date: 2009-10-13 15:06:05

Eric Niebler wrote:
> 
> Forgive me for the n00b-ish (and slightly offtopic) question, but is 
> there any way in standard C++ or in Boost.Filesystem to truncate a file 
> to a particular size? With std::ofstream, I can either truncate a file 
> on open to 0 size, or else open it in overwrite mode and scribble over 
> it, but when I'm done, I don't seem to have a way of saying, "The end of 
> the file is now *here*." Is that right? And if so, does Boost.Filesystem 
> have an API for this?
> 
> Thanks,
> 

There are two posix functions ("truncate" and "ftruncate") which might 
do what you need.

HTH

Roland