Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!dsinc!bagate!cbmvax!spence
From: spence@cbmvax.commodore.com (Spencer Shanson)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: I need help with 2.0 screens
Message-ID: <20885@cbmvax.commodore.com>
Date: 23 Apr 91 17:29:37 GMT
References: <1991Apr21.205546.3138@coral.bucknell.edu> <20882@cbmvax.commodore.com>
Reply-To: spence@cbmvax.commodore.com (Spencer Shanson)
Organization: Commodore, West Chester, PA
Lines: 32



In article <20882@cbmvax.commodore.com> spence@cbmvax.commodore.com (Spencer Shanson) writes:
>for opening your screens, you should not need to know that. All you need to do
>is pass the required modeID to Intuition's OpenScreenTags(). If the mode is
>not available (because there is no ECS Denise), then the OpenScreen() will
>fail. 
>
Furthermore, you can also find out from intuition why the screen did not
open using the SA_ErrorCode tag:

ULONG errorcode;

mysc = OpenScreenTags(...,
	...,
	SA_ErrorCode, &errorcode,
	...,
	);

Then you can compare errorcode against several values in screens.h.
In particular:

OSERR_NOCHIPS - installed rev. of custom chips don't support this mode
OSERR_NOMONITOR - User doesn't have the monitor needed for this mode.

-- 
---------------------------------------------------------------------------
Spencer Shanson - Amiga Software Engineer     | email: spence@commodore.COM
                                              | or uunet!cbmvax!spence
All opinions expressed are my own, and do not | "You know my methods. Apply
(necessarily) represent those of Commodore.   | them" -- Sir Arthur Conan
                                              | Doyle - 'The Sign of Four'