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

Subject: Re: [Boost-users] [filesystem] how to set a file size?
From: Eric Niebler (eric_at_[hidden])
Date: 2009-10-13 15:26:10

Roland Bock wrote:
> 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?
> 
> There are two posix functions ("truncate" and "ftruncate") which might 
> do what you need.

It doesn't look like these functions exist for MSVC users. So it seems 
there is no portable way to change the size of a file. Beman, would this 
make a good addition to the filesystem library?

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com