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From: awd@ut-ngp.UUCP (Andrew W. Donoho)
Newsgroups: net.micro.mac
Subject: Re: Custom windows and resources.
Message-ID: <2618@ut-ngp.UUCP>
Date: Mon, 18-Nov-85 02:16:37 EST
Article-I.D.: ut-ngp.2618
Posted: Mon Nov 18 02:16:37 1985
Date-Received: Tue, 19-Nov-85 05:59:55 EST
References: <508@harvard.ARPA>
Distribution: net
Organization: UTexas Computation Center, Austin, Texas
Lines: 31


Answers to your two questions:

How can I use a custom windowProc from a desk accessory?

Yes, Desk Accessories can have their own private resources, as
described in the Resource Manager section of Inside Macintosh.
However, the IDs that these "owned" resource can use restrict you so
that you can not have a conventional "WDEF" resource for your window
defProc.  The best thing to do is to create the window using NewWindow
or GetNewWindow and then replace the windowDefProc field with a handle
your special window definition (this can be a resource handle, or just
a normal handle: if it is a resource handle, LoadResource will be
called each time it is dereferenced by the ROM).

Where can I store special data for each window for a windowProc?

There is a field in each window called dataHandle.  This is intended
to hold a handle (or any other 4 bytes) for the use of the
windowDefProc.  This means that the defProc should make a handle of
the desired size and store it's globals there.

By the way, LoadResource will be a no-op if the handle passed to it is
not a resource or invalid.  This is quite useful.  Resource Manager
routines, as a rule, are more tolerant of bad input than Memory
Manager routines or even the other Toolbox routines.  But don't make
the mistake of passing NIL for the name of a resource in SetResInfo or
AddResource.  That is a common mistake (MDS Edit and the original
RMover have or had this error).

Darin Adler