Keyboard filter (to work with a Card Reader)

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From: Maria Penedo (MariaPenedo_at_discussions.microsoft.com)
Date: 11/16/04 

Date: Tue, 16 Nov 2004 10:29:05 -0800

I’m trying to develop a driver that filters the input of a card reader. The
card reader shares the keyboard input PS/2 port by a wedge and to the OS the
readings made by the card reader are the same as keyboard inputs. The purpose
is to extract a substring from the data in the card.
Example of reading: %a67081210343059&061010101691000166042600000000000_
Substring needed: 16604

My idea is to filter the inputs that start with some characters (in my case,
the data always start with %a670812), read them to a buffer and send only the
substring to the upper level.
I’ve already seen the kbfiltr sample but my problem is that this is first
time that I try to develop a driver and I’m really having some trouble to
understand how it works.

My questions are:
- is a driver the best solution for this case?
- If yes, how can I create a buffer in the kbfiltr sample to keep reading
chars when some kind of input is read?

TIA,

Maria

Relevant Pages

  • RE: Keyboard filter (to work with a Card Reader)
    ... > I’m trying to develop a driver that filters the input of a card reader. ... > card reader shares the keyboard input PS/2 port by a wedge and to the OS the ...
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