Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!trwind!venice!press
From: press@venice.SEDD.TRW.COM (Barry Press)
Newsgroups: comp.windows.ms
Subject: Re: Petzold's HexCalc
Message-ID: <779@venice.SEDD.TRW.COM>
Date: 22 Aug 90 16:00:20 GMT
References: <674@dbase.A-T.COM>
Reply-To: press@venice.sedd.trw.com (Barry Press)
Organization: TRW Systems Engineering & Development Division, Redondo Beach, CA
Lines: 16

In article <674@dbase.A-T.COM> awd@dbase.A-T.COM (Alastair Dallas) writes:
>[....]
>Therefore, two points: 1) Don't ignore tips.txt!  (And, by extension,
>browsing through windows.h doesn't hurt, either.) And, 2) The answer

Yea, verily.  For instance, here's another one.  It used to be that you could
use the hPrevInstance parameter passed to WinMain to see if another copy of
the app way running, and if you chose to only allow one to run exit if it was
non-zero.  You can't do that any more.  hPrevInstance seems to hang around 
non-zero for at least a while (standard mode for the instances I'm seeing) after
the previous copy is terminated.  You also have to pay attention to the change
that a second RegisterClass call while the class still exists (e.g. if
hPrevInstance is non-zero) will FAIL.

-- 
Barry Press                                 Internet: press@venice.sedd.trw.com