Re: How catching a barcode device !!

Did the manufacturer of the device you're using provide a library for using
their device? Normally that's the best mechanism available.

David

"tiziano fabbri" <tizianofabbri@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:4E67552D-5326-4C71-A841-961D3937D0DD@xxxxxxxxxxxxxxxx
Hi Paul,

have some example or tip regarding low level way (evC++ I think!?!).


"Paul G. Tobey [eMVP]" wrote:

Huh? It sounds to me like you've chosen very poorly in how you connect
things. Trying to use GetAsyncKeyStatus() is a *hopeless* way to try to
catch every key as it arrives. It seems like you should have chosen a
different way to connect the barcode scanner, so that you could control
the
communication with it (serial comes to mind).

However, since you're probably stuck with what you have, use a low-level
keyboard hook to trap all keyboard events in the system (you'll have to
do
this in native code, I think). For each keypress, you can then do
whatever
you need to do, drop the key in a queue for serial transmission or
whatever.

Paul T.

"tiziano fabbri" <tizianofabbri@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message
news:00863F1D-33FB-41CF-A77A-A37EA53F9508@xxxxxxxxxxxxxxxx
Hi , I'm finishing a new project and a new request is to catch a Ps2,
simulated keyboard, barcode device. My application is a console
application
without forms or others kind of user interface. Also I have a serial
communication in a thread with a several priority, a ftp server always
in
listening status and is possible to run a tool to communicate by second
serial. Alls is concentrate inside a 486 100MHz and 32Mbyte of RAM.
Using 'GetAsyncKeyStatus' I have some problem because I loose sometime
key
status if I use a normal thread priority, if I increase the priority I
loose
lot of time in the serial communication.
Someone has some tips for me or is prefer to use other kinds of device,
serial for example ?? thank you very much, fabbrit





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