Xref: utzoo comp.sys.amiga:36532 comp.sys.amiga.tech:6104
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wasatch!cs.utexas.edu!usc!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: XPR External Protocols Standard
Message-ID: <18362@usc.edu>
Date: 10 Jul 89 03:41:50 GMT
References: <18193@usc.edu> <12626@well.UUCP>
Sender: news@usc.edu
Reply-To: papa@pollux.usc.edu (Marco Papa)
Followup-To: comp.sys.amiga
Organization: Felsina Software, Los Angeles, CA
Lines: 27

In article <12626@well.UUCP> shf@well.UUCP (Stuart H. Ferguson) writes:
|+-- papa@pollux.usc.edu (Marco Papa) writes:
||         XPR: External File Transfer Protocols as Amiga Libraries.
||         =========================================================
||  [ ... ] This structure contains a number of things, the
||more obvious one being a pointer to a null terminated string indicating which
||files are to be sent or received and addresses of "call-back" functions inside
||the code of the communications program to access the serial device [ ... ]
|
|Aha!  More call-back functions.  There are several places where these are
|going to become important in the future, and every package so far has its
|own idea about how they should be done.  There may already be a BIX discussion
|about picking a standard way (if not, there should be!).  XPR sounds like
|a great thing, but make sure to check out the evolving position on call-backs.

At this point is clearly too late in the game. There are people already writing
XPR-based external protocols. 1.4 Intuition supports IHooks, another version
of call--back technique, though I haven't seen it proposed as the "standard"
way to do ANY kind of callback.  Willy Langeveld, who originally develped XPR,
is on BIX, so I am sure he has seen the discussions.  A discussion on callbacks
and standardazing them IS a good idea.

-- Marco Papa 'Doc'
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
uucp:...!pollux!papa       BIX:papa       ARPAnet:pollux!papa@oberon.usc.edu
"There's Alpha, Beta, Gamma, Diga and Caligari!" -- Rick Unland
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=