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From: stathis@cs.qmc.ac.uk (Stathis Gikas)
Newsgroups: comp.sys.mac.programmer
Subject: MacApp v2.0b5 problem / ModalDialogs
Message-ID: <1169@sequent.cs.qmc.ac.uk>
Date: 23 Jul 89 11:44:06 GMT
Reply-To: stathis@cs.qmc.ac.uk (Stathis Gikas)
Organization: Computer Science Dept, Queen Mary College, University of London, UK.
Lines: 84
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Hi there,

I'm developing a User Interface for a configurable
messaging system, whose semantic layer is implemented in C and
runs on a Sun, while its syntactic layers (UI) run on a number
of (different types of) remote hosts.
The syntactic layer talks to the semantic
layer via remote procedure cals. I'm coding the Mac UI.

The Problem:
============
I need to display a modal UserName/Password dialog before I
display the UI window(s). (The windows are the same for
all users, but what is displayed in them depends on the
particular user, as in a news/mail system)
So, the last line in my
        MyUIDocument.doMakeViews
method is a call to
        MyUIDocument.MakePaswdDialog
When I run the UI, the dialog is displayed ok, the edit text /
button items work fine, but when I hit the ok button, the
program crashes into MAcsBug with the message:
        "exception #4 Non-68K instruction"
Tracing the MacApp function TDialogView.PoseModaly shows that
before returning the dismisser has the right value ('ok' or 'cancel')
However, upon returning, it crashes with the above error message.

Additional Information
======================
I've allready implemented the UI in MPW 2.0.2/MacApp 1.1.1 and
everything worked fine. When we upgraded to MPW3.0/MacApp2.0b5
we thought we might as well take advantage of the new view
architecture, which makes life much easier in terms of changing
the appearance of windows/dialogs without having to recompile
the whole thing. However, MacApp2x doesn't seem to like
creating modal dialogs from its DoMakeViews method.
If I called the MyUIDocument.MakePaswdDialog procedure from a
menu (i.e from the .DoMenuCommand method) everything works
fine.
Checking the heaps shows that (usually) there is a bad
master pointer somewhere. But the program has only executed
MacApp-standard code up to this point (except the
MakePaswdDialog code, which is mine, and in any case is a copy
of the Cookbok code:

BEGIN
adWindow:=NewTemplateWindow(1512,NIL);
aDialog:=TDialogView(adWindow.FindSubView('DLOG'));
aDialog.SelectEditText('name',TRUE);
dismisser:=aDialog.PoseModally;     <----crashes here
END;
)

I have initialised  the UDialog an UPrinting Units, and I have
registered all my views.

Environment
===========
System  B1 6.0.3
Finder  B1 6.1
Mfinder 6.1b7
MPW     3.0
MacApp  2.0b5
Pascal  3.0

Any ideas? Has anybody implemented (in MAcApp2x) an application which
puts up a modal dialog before displaying its windows?
Solutions/ideas/comments greatly appreciated, as I'm getting
desperate, and I'm thinking of going back to good old
MacApp1.1.1... For people in the UK/London area: I might even
buy you a drink :-)

Thanks in advance.

PS. I've only been using MacApp2x for a month, so it might be
the case that I'm missing something really elementary/obvious.
No flames please...
-- 
====================================================================
Stathis Gikas,                  (gw: cs.ucl.edu)
Dep of Computer Science,        (ARPA) stathis@cs.qmc.ac.uk
Queen Mary College,             (UUCP) stathis@qmc-cs.UUCP
Mile End Rd, London E1 4NS,     (AppleLink) UK0087
UK.                             Tel 01-980 4811  x 5245