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Re: reading from HID keyboard [message #180509 is a reply to message #180503]

Fri, 22 February 2013 20:45

Anders Wegge Keller
Messages: 30
Registered: May 2012

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ben(at)bbarker(dot)co(dot)uk writes:

> Hi,
> I have a device that appears to my machine as a HID keyboard (though actually it is an RFID reader)
>
> I can read from it locally in php by using fopen("php://stdin",r)
>
> The problem is if I shell into this machine via ssh, then stdin comes from the remote keyboard, not from the local HID device, and the above does not return any data.
>
> I can read from /dev/input/by-id/<my device>
>
> But this returns a very large number of bytes that it is not immediately obvious how to decode
>
> Can anyone suggest a way forward here?

It's hard to say without further information, but hazarding a guess,
you are reading raw keyboard scan codes in the latter case. If I was
in your situation, I'd look at the documentation for the device in
question, and take it from there. If your documentation is lacking,
try to look at the table of PS2 scan codes, and see if they match up
with your input.

http://www.computer-engineering.org/ps2keyboard/scancodes2.html

--
/Wegge

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[Message index]

		reading from HID keyboard By: Ben Barker on Fri, 22 February 2013 17:15
		Re: reading from HID keyboard By: Anders Wegge Keller on Fri, 22 February 2013 20:45
		Re: reading from HID keyboard By: Ben Barker on Fri, 22 February 2013 22:29
		Re: reading from HID keyboard By: Ben Barker on Sat, 23 February 2013 00:21

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