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From: beard@ux1.lbl.gov (Patrick C Beard)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Color windows in LSC
Message-ID: <2431@helios.ee.lbl.gov>
Date: 18 Apr 89 08:48:25 GMT
References: <none> <1360@ndmath.UUCP>
Sender: usenet@helios.ee.lbl.gov
Reply-To: beard@ux1.lbl.gov (Patrick C Beard)
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Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 25

In article <1360@ndmath.UUCP> hardie@ndmath.UUCP (Hardie Tankersley) writes:
>I'm having trouble getting to my window's portPixMap with 
>(imageWindow->portPixMap)
>and variations on this theme.  The window is declared 'WindowPtr imageWindow',
>so maybe it doesn't treat it like a color window.  But LSC refuses to let me 
>declare a CWindowPtr or CWindowRecord.  The only related color structure LSC 
>seems to know about is a CGrafPort.  But it won't let me cast my window pointer
>dereferenced into >a CGrafPort. (i.e. ((CGrafPtr)*imageWindow)->portPixMap).
> 
>Can someone please help me find my poor lost portPixMap?
> 

The problem is in your example:  ((CGrafPtr)*imageWindow)->portPixMap
can't possibly work.  The correct cast is:  (*(CGrafPtr)imageWindow).portPixMap,
or ((CGrafPtr)imageWindow)->portPixMap.  You are right in that you do need
to cast to a CGrafPtr, but you better be sure that you create the window
with NewCWindow or GetNewCWindow  or this cast will produce nonsense.


__________________

   Patrick Beard
  PCBeard@lbl.gov
 BSI, Berkeley, CA
___________________