Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!oliveb!apple!IanHendry@apple.com
From: IanHendry@apple.com (Ian Hendry)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Have you used NewGDevice?
Message-ID: <966@internal.Apple.COM>
Date: 17 Mar 89 18:10:46 GMT
References: <1240@mmm.UUCP>
Sender: usenet@Apple.COM
Distribution: usa
Organization: Apple Computer, Inc.
Lines: 27


> I am attempting to create a graphics device for use with an off screen
>pixMap on a mac II. According to Inside Mac V, one should begin with a 
>call to NewGDevice( refNum: INTEGER; mode: LONGINT ). Since I would have
>no driver, IM V says to use -1 for the mode. However, I have no idea as 
to what
>to use for refNum. 

>If you can tell me, please do.
The correct call is
myGDevice = NewGDevice(-1,-1);

The refnum to use is -1 for creating off screen pixMaps.  At the moment I 
don't know if anything bad will happen if you use 0 and I don't know why 
it is not documented, but I was told  by one of the head quickdraw guys to 
use -1, so I do.  I am hoping for a tech note on the subject to make it 
official (obviously making this posting "unofficial").

Hope this helps,



Ian Hendry
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TE: 408-974-4737

Disclaimer:  It was all HIS idea anyway!