python之pyQt5实例：二维码生成与读取

目录

1、显示逻辑

2、业务逻辑

---

二维码的产生历史可以追溯到20世纪80年代。当时，日本Denso Wave公司为了追踪汽车零部件的运输和销售情况，开发了一种能够存储大量信息的条形码，这就是二维码的前身。到了20世纪90年代，随着手机和照相机的普及，人们开始研究如何将二维码应用到手机和相机上，以实现更快速、更便捷的数据传输和识别。

QR码（也就是我们常说的二维码）可存储 7000 多个字符，由相机等设备读取，并从像素图像中解析出包含的信息，读取速度比其他条码快得多。

1、显示逻辑

# -*- coding: utf-8 -*-
​
# Form implementation generated from reading ui file 'qr.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.
​
​
from PyQt5 import QtCore, QtGui, QtWidgets
​
​
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(703, 409)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout(self.centralwidget)
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.textEdit = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit.setMarkdown("")
        self.textEdit.setObjectName("textEdit")
        self.horizontalLayout.addWidget(self.textEdit)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.verticalLayout.addWidget(self.pushButton_2)
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setObjectName("label_3")
        self.horizontalLayout_2.addWidget(self.label_3)
        self.textEdit_2 = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit_2.setObjectName("textEdit_2")
        self.horizontalLayout_2.addWidget(self.textEdit_2)
        self.verticalLayout.addLayout(self.horizontalLayout_2)
        self.horizontalLayout_3.addLayout(self.verticalLayout)
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setLayoutDirection(QtCore.Qt.LeftToRight)
        self.label_2.setMidLineWidth(0)
        self.label_2.setObjectName("label_2")
        self.horizontalLayout_3.addWidget(self.label_2)
        self.horizontalLayout_3.setStretch(0, 1)
        self.horizontalLayout_3.setStretch(1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 703, 23))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
​
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
​
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "写入数据"))
        self.textEdit.setHtml(_translate("MainWindow", "\n"
"\n"
"

"))
        self.pushButton.setText(_translate("MainWindow", "生成二维码"))
        self.pushButton_2.setText(_translate("MainWindow", "读取二维码"))
        self.label_3.setText(_translate("MainWindow", "读取数据"))
        self.label_2.setText(_translate("MainWindow", "QR"))
​

2、业务逻辑

import sys
import qrcode
from PyQt5.QtWidgets import QApplication, QMainWindow, QMessageBox
from PyQt5.QtGui import QPixmap, QImage
from qr import Ui_MainWindow
import cv2
import numpy as np
class Ui_logo_ui(QMainWindow):
    def __init__(self):
        super().__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.setWindowTitle("二维码生成与读取")
​
        self.img = []
​
        self.data = ""
​
        self.ui.pushButton.clicked.connect(self.generateqrcode)
        self.ui.pushButton_2.clicked.connect(self.readqrcode)
    def generateqrcode(self):
        self.data = self.ui.textEdit.toPlainText()
        img= qrcode.make(data=self.data)
        img.save('qrcode.png')
        self.img=cv2.imread('qrcode.png')
        self.show_cv_img(self.img, self.ui.label_2)
​
    def readqrcode(self):
        det = cv2.QRCodeDetector()
        val, pts, st_code = det.detectAndDecode(self.img)
        self.ui.textEdit_2.setPlainText(val)
    def show_cv_img(self, img, label):
        shrink = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
        QtImg = QImage(shrink.data,
                       shrink.shape[1],
                       shrink.shape[0],
                       shrink.shape[1] * 3,
                       QImage.Format_RGB888)
        jpg_out = QPixmap(QtImg).scaled(
            label.width(), label.height())
        label.setPixmap(jpg_out)
​
    # 添加一个退出的提示事件
    def closeEvent(self, event):
        """我们创建了一个消息框，上面有俩按钮：Yes和No.第一个字符串显示在消息框的标题栏，第二个字符串显示在对话框，
                    第三个参数是消息框的俩按钮，最后一个参数是默认按钮，这个按钮是默认选中的。返回值在变量reply里。"""
​
        reply = QMessageBox.question(self, 'Message', "Are you sure to quit?", QMessageBox.Yes | QMessageBox.No,
                                     QMessageBox.No)
        # 判断返回值，如果点击的是Yes按钮，我们就关闭组件和应用，否则就忽略关闭事件
        if reply == QMessageBox.Yes:
            cv2.destroyAllWindows()
            event.accept()
        else:
            event.ignore()
​
​
if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWindow = Ui_logo_ui()
    mainWindow.show()
    sys.exit(app.exec_())