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Message-Id: <199907090513.AAA28920@mercury.xraylith.wisc.edu>
To: Rui-Tao Dong <rdong AT newport DOT com>
cc: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: Windows TRACE message 
In-Reply-To: Your message of "08 Jul 1999 16:12:41 PDT."
             <v5hfnebus6 DOT fsf AT Phantom DOT newport DOT com> 
Date: Fri, 09 Jul 1999 00:13:03 -0500
From: Mumit Khan <khan AT xraylith DOT wisc DOT EDU>

Rui-Tao Dong <rdong AT newport DOT com> writes:
> 
> >>>>> "Mumit" == Mumit Khan <khan AT xraylith DOT wisc DOT EDU> writes:
> 
>  >> Is there a way to re-direct windows TRACE message to stderr under
>  >> cygwin?
>  >> 
> 
>  Mumit> What're windows TRACE messages?
> 
> I mean messages shows up in VC studio's message window (produced by
> TRACE macro?).
> 

TRACE is not part of Win32 API, but rather part of MFC. However, it
looks like it's a "printf" style interface, so for a console-mode
program, a trivial implementation may look like the following:

  #include <stdio.h>

  #define TRACE printf
  int
  main ()
  {
    TRACE ("Entering %s\n", __PRETTY_FUNCTION__);
    TRACE ("Leaving %s\n", __PRETTY_FUNCTION__);
    return 0;
  }


$ gcc -o foo-test foo-test.c
$ ./foo-test
Entering main
Leaving main

Of course, a reasonable implementation would something much more complicated
to avoid code and runtime overhead when TRACE is turned off.

Hint: define TRACE in terms of a function taking variable number of
arguments and there use ANSI vfprintf routine to do the printing if
tracing is enabled or just return.

A win32 implementation should also check if it's GUI app; if so, open
a new console (AllocConsole and so on) and write to the new console
(or open a window with a text widget and send text to it).

Feel free to innovate. It really isn't a Cygwin issue of course.

Regards,
Mumit


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