Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!kth.se!cyklop.nada.kth.se!news
From: d88-jwa@aswad.nada.kth.se (Jon W{tte)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Linked Lists: Handles or Pointers?
Message-ID: <1991Jan24.145729.12853@nada.kth.se>
Date: 24 Jan 91 14:57:29 GMT
References: <1991Jan23.002212.7648@umiami.ir.miami.edu> <Mbbb8a_00Uh_I4wpkg@andrew.cmu.edu> <.664719435@rw8.urc.tue.nl>
Organization: Royal Institute of Technology, Stockholm, Sweden
Lines: 29

In article <.664719435@rw8.urc.tue.nl> rcbaab@urc.tue.nl writes:

>>I'm no expert on the subject, but here's my response:

>It's not that difficult to do but please do not use calls like MoveHHi() and
>HLock() and HUnlock(). They have given me lot's of problems and so I don't
>use them anymore...

Remind me not to use your programs...

If you use a dereferenced handle (like, pass it to the ToolBox)
you'll have to lock it. If you lock a handle, it's nice to do it
at the top of the heap. Thus:

	char state ;

	state = HGetState ( handle ) ;
	MoveHHi ( handle ) ;
	HLock ( handle ) ;
	DoSomething ( * handle ) ;
	HSetState ( handle , state ) ;

This is the recommended way of doing it.

							h+

Jon W{tte, Stockholm, Sweden, h+@nada.kth.se
:: This article is fake. If you take it for real, the _REAL_
:: Jon W{tte will sue you for slander. So there ! Nyah ! :-)