Generate and parse QR codes using python

Python generates QR codes. common modules include pyqrencode and qrcode.

1. Use the pyqrencode module to generate a QR code

Installing the pyqrencode module is complex and relies on many things. The following installation process is summarized after testing:

1. Download Cython: https://pypi.python.org/packages/source/C/Cython/Cython-0.19.1.tar.gz

Install: tar-zxf Cython-0.19.1.tar.gz & cd Cython-0.19.1 & python setup. py install

2. Download qrencode: http://fukuchi.org/works/qrencode/qrencode-3.4.2.tar.gz

Install yum install libpng-devel-y before installation

Installation: tar-zxf qrencode-3.4.2.tar.gz & cd qrencode-3.4.2 &./configure & make install

3, download Imaging: http://effbot.org/media/downloads/Imaging-1.1.7.tar.gz

Install: tar-zxf Imaging-1.1.7.tar.gz & cd Imaging-1.1.7 & python setup. py install

4. Download: https://codeload.github.com/bitly/pyqrencode/zip/master

Installation:

Unzip-q pyqrencode-master.zip

Cd pyqrencode-master

Easy_install cython

Cython qrencode. pyx

Python setup. py install

Echo "/usr/local/lib">/etc/ld. so. conf

Ldconfig

5. Use pyqrencode to generate a QR code

>>> From qrencode import Encoder

>>> Encoder = Encoder ()

>>> Img = encoder. encode ("hello python! ", {'Width': 300 })

>>> Img. save ("char.png ")

Char.png is the generated QR code file.

Ii. Use the qrcode module to generate a QR code

1. Download: https://pypi.python.org/packages/source/q/qrcode/qrcode-2.0.tar.gz

2. Installation: tar-zxf qrcode-2.0.tar.gz & cd qrcode-2.0 & python setup. py install

3. Use qrcode to generate a QR code

>>> Import qrcode

>>> Q = qrcode. main. QRCode ()

>>> Q. add_data ("hello python! ")

>>> Q. make ()

>>> M = q. make_image ()

>>> M.save('char.png ')

3. QR code recognition

The zbar module is used to parse the QR code. The change module is directly installed in the exe file under windowns, which is relatively simple. There are many dependent packages in linux, so the installation process is not described. The usage is as follows:

def get_QR():    scanner = zbar.ImageScanner()    scanner.parse_config("enable")    pil = Image.open("char.png").convert('L')    width, height = pil.size    raw = pil.tostring()    image = zbar.Image(width, height, 'Y800', raw)    scanner.scan(image)    data = ''    for symbol in image:        data+=symbol.data    del(image)    return data

Data is two-dimensional content.