Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!uunet!mcsun!unido!laura!tommy!klute
From: klute@tommy.informatik.uni-dortmund.de (Rainer Klute)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: rsrc_gaddr(), etc.
Keywords: rsrc_gaddr, pointers to fields
Message-ID: <3235@laura.UUCP>
Date: 6 May 91 14:46:38 GMT
References: <1991May6.023631.1912@ux1.cso.uiuc.edu>
Sender: news@laura.UUCP
Organization: University of Dortmund, Germany
Lines: 26

In article <1991May6.023631.1912@ux1.cso.uiuc.edu>,
mts10271@uxa.cso.uiuc.edu (Michael T Stepniczka) writes:
|> 	I have been trying to figure out how to get the address
|> of an object in a tree using rsrc_gaddr() without any success.
|> The problem is that I have 2 trees, and in each tree several objects.
|> I can't seem to get the address of object 1 from tree 0 and object 1
|> from tree 1- I get the same address (obj. 1 from tree 0) for both
|> of them.  Is there some way to have the rsrc_gaddr distinguish the
|> 2 objects from one another?

You should use rsrc_gaddr() only to get the address of the root object of a
tree, ie.
    rsrc_gaddr (R_TREE, TREE0, &tree0Pointer);
    rsrc_gaddr (R_TREE, TREE1, &tree1Pointer);

To get the addresses of objects inside a tree use pointer arithmetic:
    objectPointer = tree1Pointer + OBJECT1

Now objectPointer references the object with index OBJECT1 inside the
object tree with index TREE1.

-- 
  Dipl.-Inform. Rainer Klute      klute@irb.informatik.uni-dortmund.de
  Univ. Dortmund, IRB             klute@unido.uucp, klute@unido.bitnet
  Postfach 500500         |)|/    Tel.: +49 231 755-4663
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