Xref: news2.mv.net comp.os.msdos.djgpp:3220
From: nate AT millcomm DOT com (Nate Erkkilla)
Newsgroups: comp.os.msdos.djgpp
Subject: C++ ios::binary file problems
Date: 28 Apr 1996 08:11:36 GMT
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

question for anyone using gxx for reading and writing binary files:

I'm using DJGPP version 2.0 with cwsdpmi v.90+, coding in c++ and
compiling with gxx, and I am running into difficulties updating existing
binary files (created in MSDOS, with the same compiler, on the same computer, 
etc).  Reading in binary information via <ifstream>.read works
without any problems (i've been using it for weeks).  <ifstream>.seekg 
followed by a read also works without any glitches.  However <ofstream>.write 
only wants to work if the file is new, or if the ofstream object is opened 
with (ios::binary | ios:app) (append) flags.  If I attempt to <ofstream>.seekp 
a random location in the file and <ofstream>.write, the program freezes and 
locks up the machine.  I've read all the information  in the DJGPP info 
directory, and scowered the net for some assistance with ths problem and I 
cannot determine why I am having these difficulties modifying random locations 
of binary files. If anyone has any ideas, or knows about a problem/bug, etc, 
please drop me some mail, as I don't make it to usenet on a regular basis.  
Thanks,

-Nate Erkkilla <nate AT millcomm DOT com>