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Article #3434

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#3434

From: gord armstrong
Date: Tue, 29 Sep 1992 23:17

21 lines
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Thanx for the responses rx from my previous questions.

More ??? on graphics (lowly CGA) ... to write to the graphics
buffer I use VioGetPhysBuf to get the selector and proceed to
write my graphic routines. If I'm, let's say, drawing boxes
to the CGA screen and switch tasks, I get a 'Protection Violation'
error. To prevent this error I use VioScrLock and VioScrUnLock.

Unfortunatly, when I switch tasks the graphic updates stop. It's
like task switching instead of multitasking?? Do I need a thread
to create a virtual buffer and write to this buffer when in
background mode so that when I return to my graphics screen
I write the virtual buffer to graphic screen?

All help appreciated. Thanx.
---------------------------------------------------------------------
gord.armstrong@canrem.com
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Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044

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Newsgroups: comp.os.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!uunet.ca!unixbox!dosgate!dosgate![gord.armstrong@canrem.com]
From: "gord armstrong" <gord.armstrong@canrem.com>
Subject: graphics
Message-ID: <199229.4879.13532@dosgate>
Reply-To: "gord armstrong" <gord.armstrong@canrem.com>
Organization: Canada Remote Systems
Distribution: comp
Date: 29 Sep 92 18:17:52 EST
Lines: 21