python zbar

#!/usr/bin/python
import zbar
from PIL import Image
import urllib
import cStringIO

#图片地址替换成你的qrcode图片地址
URL = (‘http://example.qiniudn.com/msgimagepicc4WJ-4iTk8.jpeg‘)
# create a reader
scanner = zbar.ImageScanner()
# configure the reader
scanner.parse_config(‘enable‘)
# obtain image data
imgfile = cStringIO.StringIO(urllib.urlopen(URL).read())
pil = Image.open(imgfile).convert(‘L‘)

width, height = pil.size
raw = pil.tostring()
# wrap image data
image = zbar.Image(width, height, ‘Y800‘, raw)
# scan the image for barcodes
scanner.scan(image)
# extract results
for symbol in image:
    # do something useful with results
    print ‘decoded‘, symbol.type, ‘symbol‘, ‘"%s"‘ % symbol.data
# clean up
del(image)