Bar Code Scanner Using Arduino

i newbee arduino, need guidance in terms of setting project arduino scanning bar codes. using following hardware:

1. arduino uno r3
2. arduino usb shield

1st need is, can please let me know usb bar code scanner should buy(its specifications) compatible arduino.

secondly please mention if need other hardware achieve same.

also suggest link or paste source code executing scanning program.

thanks much  :~

it arguably easier find a(n older) barcode scanner has ps/2 interface not need usb shield , arduino ide has libraries interpret ps/2 protocol.

almost bar code scanners self-contained, emit numeric code spontaneously when detect valid bar code or when trigger pressed.  software needs interpret code when received.

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