Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!cs.utexas.edu!mailrus!ncar!midway!ellis.uchicago.edu!dwal
From: dwal@ellis.uchicago.edu (David Walton)
Newsgroups: comp.sys.mac.system
Subject: Re: How to add startup icon to one that doesn't?
Message-ID: <1990Aug4.214719.24490@midway.uchicago.edu>
Date: 4 Aug 90 21:47:19 GMT
References: <29956.26a4beb0@vaxb.acs.unt.edu> <1990Jul20.001136.6842@midway.uchicago.edu> <1841@petsd.UUCP>
Sender: news@midway.uchicago.edu (News Administrator)
Organization: U. Chicago Computing Organizations, Academic and Public Comp.
Lines: 50

In article <1841@petsd.UUCP> hill@petsd.UUCP (John S. Hill) writes:
>In article <1990Jul20.001136.6842@midway.uchicago.edu> dwal@midway.UUCP writes
>>
>>If an INIT doesn't show an icon at startup, it's not really possible
>>to hack it up so it does.  This sort of thing isn't managed by the
>>system, but by a procedure which Apple distributes (to anybody who
>>asks for it) for anybody who wants to include in in his her INIT.  For
>>that reason, if the routine wasn't included when the program was
>>linked, you wouldn't be able to just twiddle some bits and make the
>>call.  As it is, the icon that is displayed is generally based upon
>>runtime conditions (i.e., whether a certain installation procedure
>>succeeds), and hacking that in bit-wise would be a pain in the **s.
>>
>
>It is possible and in fact very easy to add icons to most inits/cdevs that
>don't have start up icons.  First, find an init/cdev that does show
>its icon, then with ResEdit open that file.  Look in the INIT resource,
>where you may find a resource called ShowINIT.  Copy this resource and paste
>it into the target init/cdev, changing it's resource id to match the resource
>id of the ICN# that you want to display.   That's all there's to it.  You may
>of course have to add an ICN# if it doesn't have one, but that's also no big
>deal if you're the least bit artistically inclined.

First, You can't show an INIT's ICN# just by cutting and pasting
resources: you have to do it in code.  Second, ShowINIT isn't a
resource, it's a procedure written in assembly language which is
called by the INIT resource to show its ICN#.  In fact, it's the
procedure which I mentioned in my original reply.  You can't just cut
and paste this portion of the INIT code with ResEdit; you have to put
in a call to ShowINIT in the INIT code itself, with the resource ID of
the ICN# you want to display as one of the parameters.  This is what I
meant when I said that it's not really possible to modify an existing
INIT to display an ICN#.

Now, a point of clarification: what I should have said in my original
post is that it's not really _worth the effort_ to try to modify an
existing INIT _resource_ to display an ICN#.  As many folks later
pointed out, it's quite possible to add a second INIT resource to an
INIT file which will grab the file's ICN# (or one you create) and
display that ICN#.  The drawback to this workaround is that many INITs
display a different ICN# depending on run-time conditions, such as
whether or not the INIT loaded successfully.  The workaround can't do
that, because it can't determine the run-time conditions of the
previous INIT resources.

--

David Walton		Internet: dwal@midway.uchicago.edu
University of Chicago   {  Any opinions found herein are mine, not  }
Computing Organizations {  those of my employers (or anybody else). }