Date:	Mon, 8 Dec 1997 18:10:43 -0800 (PST)
Message-Id:	<199712090210.SAA12042@adit.ap.net>
Mime-Version:	1.0
To:	"H. Anthony Hoyt" <hahoyt AT eng2 DOT uconn DOT edu>,
	DJGPP Mailing List <djgpp AT delorie DOT com>
From:	Nate Eldredge <eldredge AT ap DOT net>
Subject:	Re: Takeing over interupt handlers

At 08:44  12/7/1997 -0500, H. Anthony Hoyt wrote:
>I know this is more of a C++ thing then an DJGPP thing but I though I
>might give the croud a shot at this.
>
>I have a Keyboard class which I want to use to take over the keyboard
>interupt 0x09.  So I create an instance of _go32_dpmi_seginfo for the old
>handler and my new one.  I then _Try_ to get the segment:offset address
>for my handler and then set my function as the new handler.
>Well In created a test function that shout print what key is currently
>pressed but when I run it, and hit a few keys, nothing happends.  Now I've
>tried everything I could to get the new handler installed past the old one
>but I can't seem to get it right.  Is it possable to override an interupt
>with a C++ class function?  Or do I have to do it in regular C and bear
>with it?
First of all, read FAQ section 18.9.
Also, make sure not to use I/O functions inside the interrupt handler since
this can cause very bad stuff to happen.
I don't know whether you can have a C++ class member function as an
interrupt handler; I suspect not. If you write it as a function of its own,
not in any class, everything should be fine.

Nate Eldredge
eldredge AT ap DOT net

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