Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!sjsca4!poffen
From: poffen@sj.ate.slb.com (Russ Poffenberger)
Newsgroups: comp.windows.ms.programmer
Subject: Re: Solution to BC++ Petzold problem, and mild bug report
Message-ID: <1991May13.232028.17319@sj.ate.slb.com>
Date: 13 May 91 23:20:28 GMT
References: <2828D392.40DD@wilbur.coyote.trw.com> <1991May9.160511@geohub.gcn.uoknor.edu>
Reply-To: poffen@SunOS (Russ Poffenberger)
Organization: Schlumberger Technologies, ATE division, San Jose, Ca.
Lines: 39

In article <1991May9.160511@geohub.gcn.uoknor.edu> butch@geopix.gcn.uoknor.edu writes:
>In article <2828D392.40DD@wilbur.coyote.trw.com>, rich@wiley.uucp (Rich
>Messenger) writes:
>
>|>I recently posted a question about wierd behavior trying to get
>|>Petzold's first sample program from _Programming Windows_ to run under
>|>BC++.  Although there were no reposnses from this news group, I
>|>eventually tracked down the problem and thought I might be of general
>|>interest to other BC++ users.
>|>
>|>(1) When you are compiling as C++, you *cannot* use the EXPORTS section
>|>in the .DEF file, since the name is mangled by C++ before the linker
>|>ever sees it.  This tidbit is not mentioned in the documentation.
>|>
>|>(2) You can use "smart callbacks" and thigs work great as long as
>|>you're not writing a DLL or using the huge memory model.
>|>
>|>(3) You can tag exportable functions with "_export".  You *must* put
>|>this keyword in both the function declaration and function definition.
>|>MILD BUG: BC++ does not complain if you declare the function without
>|>_export, and define it with _export; it simply exhibits wierd behavior
>|>on execution.
>|>
>
>Would someone please explain this to me.  I recently copied the SysMets 
>program from the book and it worked just fine.  I didn't use the _export
>tag but simply used the EXPORTS section of the DEF.  It seemed to work
>fine.  Was it really messed up but I just didn't notice?  
>Response by e-mail is fine.
>

What was the name of the file? sysmets.c? or sysmets.cpp? If the file has a
".c" extension, then it is compiled as straight "C" code, and the name mangling
problem doesn't appear.

Russ Poffenberger               DOMAIN: poffen@sj.ate.slb.com
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