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From: valentin@cbmvax.commodore.com (Valentin Pepelea)
Newsgroups: comp.sys.amiga.tech
Subject: Re: RKM: Libs and Devs
Message-ID: <9410@cbmvax.commodore.com>
Date: 21 Jan 90 07:41:01 GMT
References: <1990Jan20.042239.12232@athena.mit.edu>
Reply-To: valentin@cbmvax.commodore.com (Valentin Pepelea)
Organization: Commodore, West Chester, PA
Lines: 41

In article <1990Jan20.042239.12232@athena.mit.edu> rlcarr@space.mit.edu (the Wizard of Speed and Time) writes:
>I just picked up the new Libs and Devs RKM and typed in the first example
>(pp. 7-9).  A couple of questions:
>
>1) there is the line
>struct IntuitionBase *IntuitionBase = NULL;
>
>I was under the impression that Lattice included an IntuitionBase in lc*.lib,

Yeah, so?

>so that this line should be        extern struct etc. etc.

The author wanted to automatically initialize the pointer to NULL. The line
"extern struct IntuitionBase *IntuitionBase = NULL;" would have been
translated to "struct IntuitionBase *IntuitionBase = NULL;" anyway because
you cannot auto-initialize externs.

>Also, for the program, the compiler options are given as
>-b1 -cfist -L -v -w
>
>Now, -w selects 16 bit ints.  Is there any reason this was used?

I guess smaller data size, a slight incresed speed are it.

> Should it have been -y instead (load A4 with LinkerDB)?

What for? A4 get loaded with the LinkerDB upon program entry. You want to use
-y only when some of your routines (assembler modules for ex.) trash A4, or
when the code is intented to be used by other tasks or interrupts.

>Now for the problem.  Despite (1) the code compiles and links fine.
>However, when I run it, instead of "Our Own Screen" in the title bar, I
>get a blank ORANGE titlebar (the screen gadgets ARE drawn and are in their
>correct colors).  However, the  window DOES have "graniteWindow" in its
>titlebar.  Also, the program works fine and returns all its memory.

Look at your typed-in code once again. I think the pointer to the "Our Own
Screen" does not get initialized correctly. Maybe you forgot a comma somewhere?

Valentin