Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!ucdavis!iris!lim
From: lim@iris.ucdavis.edu (Lloyd Lim)
Newsgroups: comp.sys.mac.programmer
Subject: Re: ROM Unlocks handles
Message-ID: <6184@ucdavis.ucdavis.edu>
Date: 7 Dec 89 02:08:05 GMT
References: <2744@dogie.macc.wisc.edu> <3838@atr-la.atr.co.jp> <32977@ucbvax.BERKELEY.EDU> <5640@internal.Apple.COM>
Sender: uucp@ucdavis.ucdavis.edu
Reply-To: lim@iris.ucdavis.edu (Lloyd Lim)
Organization: U.C. Davis - Department of Electrical Engineering and Computer Science
Lines: 27

In article <5640@internal.Apple.COM> shebanow@Apple.COM (Andrew Shebanow) writes:
>In article <32977@ucbvax.BERKELEY.EDU> oster@dewey.soe.berkeley.edu.UUCP (David Phillip Oster) writes:
>>[...]
>>	temp = (**hand).field;
>>	SystemCall(&temp);
>>	(**hand).field = temp;
>>[...]
>
>Ack! Please, please don't do this! If the system call expects a
>Handle, you should never, ever pass it a fake handle. While your
>technique will work on current Mac System Software, it will break
>[...]
>Andrew Shebanow
>MacDTS

Ack! Fake handle? What, where? The SystemCall just wants a pointer to a
variable (Pascal VAR parameter). Copying a field into a local temporary is
a perfectly valid way of eliminating moving memory problems. There are no
fake handles here.

Please read a little more carefully. DTS has not looked good lately with
the recent tech note errors and flame war postings.

+++
Lloyd Lim     Internet: lim@iris.ucdavis.edu (128.120.57.20)
              Compuserve: 72647,660
              US Mail: 146 Lysle Leach Hall, U.C. Davis, Davis, CA 95616