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From: whkr@ciba-geigy.ch (Hans Kraft)
Newsgroups: comp.windows.ms.programmer
Subject: Re: CreateWindows() with BC++ gives exception 13 / error 0
Message-ID: <1991Mar14.071522.21044@ciba-geigy.ch>
Date: 14 Mar 91 07:15:22 GMT
References: <21029@shlump.nac.dec.com>
Sender: Hans Kraft
Organization: Ciba-Geigy AG, Basel, Switzerland
Lines: 14
Nntp-Posting-Host: cgcha

Don't put a pointer into the extra data area of a window, as that
pointer could refer to a movable or even discadable segment. After
reload or move of the according segment (done without notice by
windows) the pointer is obsolete. It is better to allocate a segment
(e.g. GlobalAlloc) and store the handle of the segment. Then lock
(GlobalLock) the segment before use. You could also lock the segment
after allocation and leave it locked for the application. Then you
could store the pointer - but this is not recommended as it 
deteriorates windows memory management and it can give problems in 
some memory models.
Hope this helps

Giovanni Forza
(Hans Kraft)