From:	Thomas Demmer <demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DJGPP 2.01 C++ I/O problem
Date:	Tue, 23 Sep 1997 17:28:16 +0200
Organization:	Lehrstuhl fuer Stroemungsmechanik
Lines:	39
Message-ID:	<3427E010.CE0E9FCD@LSTM.Ruhr-UNI-Bochum.De>
References:	<199709220855 DOT SAA00358 AT rabble DOT uow DOT edu DOT au>
NNTP-Posting-Host:	c64.lstm.ruhr-uni-bochum.de
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Brett Porter wrote:
> 
> > - fails if using C++ style in DJGPP
> >     ifstream f("test.txt", ios::nocreate | ios::in | ios::out | ios::binary);
> First of all, it should be fstream, not ifstream. ifstreams can't write data.
> Ahh, but I see you had it correct in your code anyway. You should also
> specify ios::ate, ios::noreplace or ios::nocreate to make sure it is not
> overwritten (you need this in Borland too, I'm positive).
> 
> However, this is a bug in GCC I believe (I had the same problem some time
> back). Random file access does not work in iostreams. I didn't get any
> answer about fixing it other than getting the source and recompiling GCC.
> The only option I have found is to use the old C FILE streams (I actually
> like these better for binary anyway).
It is in the iostream library, to be precise. As a fix you may do

 int h = open("test.txt" , O_RDRW|O_BINARY); // fingers crossed, check
info
 if( h<0)
   bail_out
 fstream f(h); // Init fstream with a valid file handle

Ugly, but it works. Somewhere I saw a replacement for djgpp's,
but I don't remember where. It was related to TurboVision.

-- 
Ciao
Tom

*************************************************************
* Thomas Demmer                                             *
* Lehrstuhl fuer Stroemungsmechanik                         *
* Ruhr-Uni-Bochum                                           *
* Universitaetsstr. 150                                     *
* D-44780  Bochum                                           *
* Tel: +49 234 700 6434                                     *
* Fax: +49 234 709 4162                                     *
* http://www.lstm.ruhr-uni-bochum.de/~demmer                *
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