Path: utzoo!attcan!uunet!mcvax!hp4nl!uva!eduard
From: eduard@uva.UUCP (Eduard de Jong)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: Is it possible to test for the existance of an object?
Message-ID: <585@uva.UUCP>
Date: 22 Dec 88 17:22:05 GMT
References: <82129@sun.uucp> <258@gloom.UUCP>
Reply-To: eduard@uva.UUCP (Eduard de Jong)
Organization: Faculteit Wiskunde & Informatica, Universiteit van Amsterdam
Lines: 37

Newsgroups: comp.sys.mac.hypercard
Subject: Re: HyperCard on floppies
Summary: Non-boot disks must be mounted by startup application.
Expires: 
References: <29693@tut.cis.ohio-state.edu>
Sender: 
Reply-To: eduard@uva.UUCP (Eduard de Jong)
Followup-To: 
Distribution: world
Organization: Faculteit Wiskunde & Informatica, Universiteit van Amsterdam
Keywords: Startup, mounting disks.

In article <29693@tut.cis.ohio-state.edu> Howard P. Marvel asks:

>	1.  How do I delay until the 2d disk is recognized?

This problem may be explained by looking at the MACs boot procedure.
It runs (scematicaly) like this:
At Boot_time only the boot disk is mounted by the boot code; the system
can subsequently be read using the standard FileManager calls.  Any
floppydrives or SCSI devices connected to the machine and recognised at
boot_time (ie powered and running) are put in the event queue with a
"DiskInsert Event" message.  However, any drivers needed for the disks
are loaded at boot_time.  Normally the Finder will directly after its is
launched cause the disks to be mounted when it discovers them at its
first calls to GetNextEvent.

This expose leads to a possible solution:
If HC, as I expect, correctly handles DiskInsert events all you need is
an Idle-handler in the Home stack that goes to your stack on the other
disk. This should work as I figure HC posts Idle messages only after it has
seen and processed any real events (like KeyDown & DiskInsert &c.).

Hope you get this working now.

--No fancy signature-- 
	Eduard K. de Jong Frz.