From: "Michael Stewart" <mike AT reggin DOT freeserve DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: wierd problem
Date: Mon, 12 Jul 1999 09:43:50 +0100
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Sahab Yazdani wrote in message <37893502 DOT 9FB263CB AT geocities DOT com>...
>okay, first I wrote a keyboard handling class in C++, and every thing
>seemed to go okay, now I have a funny implementation of it, for instance
>(extremely simplified code):
>
<snip>
>
>The funny thing is that the first call to GetKeyPressed works, but the
>second one doesn't (the one thats in the function).  No matter which key
>you press it crashes, and it destroys the DOS box along with it (because
>windows notices that the interrupt handler hasn't been released).  A
>person that I asked said that the keyboard interrupt address has
>changed????  Anyways any help would be greatly appriecited.  If you want
>some source code, plz just e-mail!


Sounds like you're not signalling the end of the interrupt. If that is the
case then just put this line at the end of the interrupt handler.

outportb (0x20, 0x20);

For a working C++ keyboard handler see my webpage
(http://www.reggin.freeserve.co.uk/ in the snippets section)

Michael Stewart