Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!ux1.lbl.gov!beard
From: beard@ux1.lbl.gov (Patrick C Beard)
Newsgroups: comp.sys.mac.programmer
Subject: Re: LightSpeed C returning a pascal structure
Message-ID: <1315@helios.ee.lbl.gov>
Date: 25 Nov 88 23:51:40 GMT
References: <2583@munnari.oz>
Sender: usenet@helios.ee.lbl.gov
Reply-To: beard@ux1.lbl.gov (Patrick C Beard)
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 31

In article <2583@munnari.oz> iand@munnari.oz (Ian Robert Dobson) writes:
>I am writing a program which utilises the list manager and have run into
>problems using LightSpeed C (3.0).  The toolbox routine:
>	   Function LLastClick (lHandle : ListHandle) : Cell;
>would logically translate to:
>	   pascal Cell LLastClick(ListHandle lHandle)
>
>However LSC doesn't seem to want to return a non-integral pascal data type,
>so the routine is defined in the #include file as returning a 'long'.
>Furthermore, the type conversion between a long and a point gives me a 'bad
>cast' error, even though they are the same size.  Does anybody have a solution
>to obtaining the cell (point) without manually converting the types by
>splitting the long in C code.
>
>Ian R. Dobson
>University of Melbourne
>munnari.oz!iand

Here's the hack I use:

	/* To convert a long to a Cell (which is really just a Point) */
	Cell theCell;
	long theLastClick;

	theLastClick=LLastClick(listH);

	theCell=*(Cell*)&theLastClick;	/* yech but it works! */

I hope this helps.

Patrick Beard
Lawrence Berkeley Laboratory