From:	ryan4600 AT my-deja DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	Keyboard Handler problem
Date:	Tue, 06 Jun 2000 10:03:52 GMT
Organization:	Deja.com - Before you buy.
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hi,
I am writing a keyboard handler and am having some problems with
writing efficient code. I have successfully locked all code (using DPMI
functions) and can get most of the keys on my keyboard. But these are
the problems I am having.

I have a state map which gets the state of keys like the alt and
control key. Now the array I am using for this purpose is global in my
program as I can't pass anything to the handler function.

Similarly there are other variables being used in the handler which are
global.

Is it okay to pass variables to the handler(like other C  functions)?

Another problem is that my handler size is getting bigger as I am
making many checks inside the handler. One of them is for checking if
the buffer (I am using) is full or not. Then there are othes for
checking if any of the function keys was pressed, or any other keys I
want to ignore. Is it okay to make checks in the ISR? Or should I make
them outside?


Thanks,
Ryan


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