• Pyqt+QRcode 生成 识别 二维码


    1.生成二维码

    python生成二维码是件很简单的事,使用第三方库Python QRCode就可生成二维码,我用Pyqt给QRcode打个壳

    一.python-qrcode介绍

    python-qrcode是个用来生成二维码图片的第三方模块,依赖于 PIL 模块和 qrcode 库。

    PIL下载地址:

     https://pypi.python.org/pypi/PIL/1.1.6         或

     http://www.pythonware.com/products/pil/

    qrcode下载地址: 

    https://pypi.python.org/pypi/qrcode

    安装:

    1 python setup.py install 

    简单用法

    1 import qrcode 
    2 img = qrcode.make('hello, qrcode')
    3 img.save('test.png')

    高级用法

     1 import qrcode 
     2 qr = qrcode.QRCode(     
     3     version=1,     
     4     error_correction=qrcode.constants.ERROR_CORRECT_L,     
     5     box_size=10,     
     6     border=4, 
     7 ) 
     8 qr.add_data('hello, qrcode') 
     9 qr.make(fit=True)  
    10 img = qr.make_image()
    11 img.save('test.png')

    参数说明:

    version:值为1~40的整数,控制二维码的大小(最小值是1,是个12×12的矩阵)。 如果想让程序自动确定,将值设置为 None 并使用 fit 参数即可。

    error_correction:控制二维码的错误纠正功能。可取值下列4个常量。
      ERROR_CORRECT_L:大约7%或更少的错误能被纠正。
      ERROR_CORRECT_M(默认):大约15%或更少的错误能被纠正。
      ROR_CORRECT_H:大约30%或更少的错误能被纠正。

    box_size:控制二维码中每个小格子包含的像素数。

    border:控制边框(二维码与图片边界的距离)包含的格子数(默认为4,是相关标准规定的最小值)

    二. 打壳

    做一个Ui转换为Py文件, import qrcode 后就可以生成二维码了

    完整代码如下:

      1 # -*- coding: utf-8 -*-
      2 
      3 # Form implementation generated from reading ui file 'Qrcode.ui'
      4 #
      5 # Created: Thu Jan 22 09:32:41 2015
      6 #      by: PyQt4 UI code generator 4.10.3
      7 #
      8 # WARNING! All changes made in this file will be lost!
      9 
     10 from PyQt4 import QtCore, QtGui
     11 
     12 try:
     13     _fromUtf8 = QtCore.QString.fromUtf8
     14 except AttributeError:
     15     def _fromUtf8(s):
     16         return s
     17 
     18 try:
     19     _encoding = QtGui.QApplication.UnicodeUTF8
     20     def _translate(context, text, disambig):
     21         return QtGui.QApplication.translate(context, text, disambig, _encoding)
     22 except AttributeError:
     23     def _translate(context, text, disambig):
     24         return QtGui.QApplication.translate(context, text, disambig)
     25 
     26 class Ui_qrcode(object):
     27     def setupUi(self, qrcode):
     28         qrcode.setObjectName(_fromUtf8("qrcode"))
     29         qrcode.setEnabled(True)
     30         qrcode.resize(515, 424)
     31         self.groupBoxshow = QtGui.QGroupBox(qrcode)
     32         self.groupBoxshow.setGeometry(QtCore.QRect(50, 120, 431, 281))
     33         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)
     34         sizePolicy.setHorizontalStretch(0)
     35         sizePolicy.setVerticalStretch(0)
     36         sizePolicy.setHeightForWidth(self.groupBoxshow.sizePolicy().hasHeightForWidth())
     37         self.groupBoxshow.setSizePolicy(sizePolicy)
     38         self.groupBoxshow.setMinimumSize(QtCore.QSize(0, 0))
     39         self.groupBoxshow.setAutoFillBackground(True)
     40         self.groupBoxshow.setCheckable(False)
     41         self.groupBoxshow.setObjectName(_fromUtf8("groupBoxshow"))
     42         self.label = QtGui.QLabel(self.groupBoxshow)
     43         self.label.setGeometry(QtCore.QRect(10, 20, 401, 241))
     44         self.label.setText(_fromUtf8(""))
     45         self.label.setObjectName(_fromUtf8("label"))
     46         self.groupBox = QtGui.QGroupBox(qrcode)
     47         self.groupBox.setGeometry(QtCore.QRect(50, 20, 431, 91))
     48         self.groupBox.setObjectName(_fromUtf8("groupBox"))
     49         self.horizontalLayoutWidget = QtGui.QWidget(self.groupBox)
     50         self.horizontalLayoutWidget.setGeometry(QtCore.QRect(10, 10, 401, 80))
     51         self.horizontalLayoutWidget.setObjectName(_fromUtf8("horizontalLayoutWidget"))
     52         self.horizontalLayout = QtGui.QHBoxLayout(self.horizontalLayoutWidget)
     53         self.horizontalLayout.setMargin(0)
     54         self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
     55         self.label_url = QtGui.QLabel(self.horizontalLayoutWidget)
     56         self.label_url.setObjectName(_fromUtf8("label_url"))
     57         self.horizontalLayout.addWidget(self.label_url)
     58         self.lineEditInput = QtGui.QLineEdit(self.horizontalLayoutWidget)
     59         self.lineEditInput.setObjectName(_fromUtf8("lineEditInput"))
     60         self.horizontalLayout.addWidget(self.lineEditInput)
     61         self.pushButtonOk = QtGui.QPushButton(self.horizontalLayoutWidget)
     62         self.pushButtonOk.setObjectName(_fromUtf8("pushButtonOk"))
     63         self.horizontalLayout.addWidget(self.pushButtonOk)
     64 
     65         self.retranslateUi(qrcode)
     66         QtCore.QMetaObject.connectSlotsByName(qrcode)
     67 
     68     def retranslateUi(self, qrcode):
     69         qrcode.setWindowTitle(_translate("qrcode", "Pyqt Qrcode", None))
     70         self.groupBoxshow.setTitle(_translate("qrcode", "二维码显示", None))
     71         self.groupBox.setTitle(_translate("qrcode", "填写二维码内容", None))
     72         self.label_url.setText(_translate("qrcode", "URL地址:", None))
     73         self.pushButtonOk.setText(_translate("qrcode", "生成二维码", None))
     74 
     75 
     76 import qrcode
     77 class showQr(QtGui.QWidget):
     78     def __init__(self):
     79         super(showQr, self).__init__()
     80         self.ui_qr = Ui_qrcode()
     81         self.ui_qr.setupUi(self)
     82         # PyQT禁止窗口最大化按钮:
     83         self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint)
     84         # PyQT禁止调整窗口大小:
     85         self.setFixedSize(self.width(), self.height())
     86 
     87         # 触发信号槽
     88         QtGui.QWidget.connect(self.ui_qr.pushButtonOk, QtCore.SIGNAL('clicked()'), self.generateQr) 
     89         # self.ui_qr.pushButtonOk.clicked.connect(self.generateQr)
     90 
     91     def generateQr(self):
     92         textcontent=self.ui_qr.lineEditInput.text()
     93         if textcontent=='':
     94             QtGui.QMessageBox.information(self, (u'提示'),(u'请填写URL地址'),QtGui.QMessageBox.Yes)
     95         else:
     96             filename='Qrcode.png'
     97             qr = qrcode.QRCode(
     98                 version=None,
     99                 error_correction=qrcode.constants.ERROR_CORRECT_L,
    100                 box_size=5,
    101                 border=4,
    102             )
    103             qr.add_data(textcontent)
    104             qr.make(fit=True)
    105             img = qr.make_image()
    106             img.save(filename)
    107             # img = qrcode.make(textcontent)
    108             # img.save(filename)
    109             self.ui_qr.label.setPixmap(QtGui.QPixmap(filename))
    110 
    111 
    112 
    113      # 重载keyPressEvent ,  当按下Esc退出
    114     def keyPressEvent(self, event):
    115         if event.key() ==QtCore.Qt.Key_Escape:
    116             self.close()
    117 
    118 
    119 if __name__ == "__main__":
    120     import sys
    121     app = QtGui.QApplication(sys.argv)
    122     qr = showQr()
    123     qr.show()
    124     sys.exit(app.exec_())

    运行效果:


    2.识别二维码

    解析二维码用到zbar模块

    扯蛋的zbar 在Pypi中只有py25 和py26 版本,更新时间还是2009年, 下载后py27还用不了! 

    最后在github 中找到支持Py27的zbar库  

    地址: https://github.com/jacobvalenta/zbar-py27-msi

    one_qr_code.png

    代码:

     1 from PIL import Image
     2 import zbar
     3 
     4 def get_QR():
     5     scanner = zbar.ImageScanner()
     6     scanner.parse_config("enable")
     7     pil = Image.open("one_qr_code.png").convert('L')
     8     width, height = pil.size
     9     raw = pil.tostring()
    10     image = zbar.Image(width, height, 'Y800', raw)
    11     scanner.scan(image)
    12     data = ''
    13     for symbol in image:
    14         data+=symbol.data
    15     del(image)
    16     return data
    17 
    18 qrdata= get_QR()
    19 print(qrdata)

    返回解析结果:

    http://weixin.qq.com/r/n0zE3NfEaooVrZO-9xmN
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  • 原文地址:https://www.cnblogs.com/dcb3688/p/4241048.html
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