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Date: Mon, 10 Jan 2000 18:18:05 -0500 (EST)
From: Jamie Guinan <guinan AT bluebutton DOT com>
X-Sender: guinan AT gemini DOT home DOT net
Reply-To: guinan AT bluebutton DOT com
To: Mumit Khan <khan AT NanoTech DOT Wisc DOT EDU>
cc: Cygwin Mailing List <cygwin AT sourceware DOT cygnus DOT com>
Subject: Re: Segfault when call kernel32 function 
In-Reply-To: <Pine.HPP.3.96.1000110165637.22291B-100000@hp2.xraylith.wisc.edu>
Message-ID: <Pine.LNX.4.10.10001101758350.1054-100000@gemini.home.net>
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On Mon, 10 Jan 2000, Mumit Khan wrote:

> On Mon, 10 Jan 2000, Jamie Guinan wrote:
> 
> > Ah!  Got it working now.  When I first tried your suggestion I 
> > mistakenly used
> > 
> >   static const char mode_str[128] = "9600,N,8,1";
> >          ^^^^^
> > 
> > instead of 
> > 
> >   static char mode_str[128] = "9600,N,8,1";
> 
> Yup, the 'const' pretty much kills the reason for making it a writable
> buffer ;-)
> 
> Glad it worked. Feel free to send a bug report to the OS vendor. I bet
> it's going to be fixes as soon as MSVC starts supporting putting const
> strings in readonly memory (or perhaps that's *why* MSVC doesn't do it
> yet).

I did some searching on microsoft.com, and it looks like MSVC 6 did 
in fact start putting const stuff in read-only memory,

  http://support.microsoft.com/support/kb/articles/Q201/3/72.ASP

But the popular reference for Win32 serial programming where I
first found BuildCommDCB is from 1995, pre-MSVC 6,

  http://msdn.microsoft.com/library/techart/msdn_serial.htm

I emailed them about this potential source of confusion, but I'm 
not holding my breath. :)

-Jamie

================================================================
Jamie Guinan                         Blue Button Solutions, Inc.
guinan AT bluebutton DOT com                  http://www.bluebutton.com
================================================================



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