#!/usr/bin/python
from?sys?import?argv
import?zbar

#?create?a?Processor
proc?=?zbar.Processor（）

#?configure?the?Processor
proc.parse_config（‘enable‘）

#?initialize?the?Processor
device?=?‘/dev/video0‘
if?len（argv）?>?1:
????device?=?argv[1]
proc.init（device）

#?setup?a?callback
def?my_handler（proc?image?closure）:
????#?extract?results
????for?symbol?in?image.symbols:
????????#?do?something?useful?with?results
????????print?‘decoded‘?symbol.type?‘symbol‘?‘“%s“‘?%?symbol.data

proc.set_data_handler（my_handler）

#?enable?the?preview?window
proc.visible?=?True

#?initiate?scanning
proc.active?=?True
try:
????#?keep?scanning?until?user?provides?key/mouse?input
????proc.user_wait（）
except?zbar.WindowClosed?e:
????pass