From: lsantil AT calstatela DOT edu
Date: Fri, 19 Jun 1998 01:01:54 -0700 (PDT)
To: Nate Eldredge <nate AT cartsys DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: Get file size in C++
In-Reply-To: <3589B9CF.AC9FDAE4@cartsys.com>
Message-ID: <Pine.GSO.3.96.980619005514.8805A-100000@neptune>
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On Thu, 18 Jun 1998, Nate Eldredge wrote:

> lsantil AT calstatela DOT edu wrote:
> > 
> > How is it possible to get the size of a file in C++?  I know if I opened
> > a file in C w/ "FILE *f;" that I just include "io.h" & use printf to print its
> > size from the return val of "filelength(fileno(f))" but I'm using ifstream &
> > "fstream.h" to open my files.  I looked thru the "lang/cxx/" dir & found
> > "iostdio.h" which makes some of the "stdio.h" defines equivalent to _IO_*
> > including "#define fileno _IO_fileno" //line 107// but I dont see how I can
> > do the same with "ifstream f".  any suggestions?
> 
> It looks like there's a member function of one of the classes from which
> `ifstream' is derived called `fd', which returns the file descriptor
> (aka handle) of the stream.  You can then pass that to `filelength' et
> al.  I'm not sure of the C++ syntax; it might be something like
> `f.fd()'.

You were close Nate.  I looked thru the fstream.h(I after your gave me
a hint at what to look for) & noticed the member f.filedesc()
which does return the file number/file descriptor which you can pass
to fiellength.  BTW, is there a builtin member that is defined
somewhere so that I can just do something simple like this
"cout << f.filelength();" & so that I dont have to include io.h?

> 
> -- 
> 
> Nate Eldredge
> nate AT cartsys DOT com
> 
>