Pyqt5 接口 Arduino 伺服 ErrorType“对象没有属性 'ser'”

Question

我在连接 Arduino 时遇到问题。我可以用一个简单的程序与 Arduino 通信，比如读取数据和写入数据。我使用 PyQt5 创建了一个接口来控制伺服电机，但出现错误：

'Ui_MainWindow' object has no attribute 'ser'

我使用的代码是：

from PyQt5 import QtCore, QtGui, QtWidgets
import serial
import time
import sys

class Ui_MainWindow(object):
    def setupUi(self, MainWindow, ser):

        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(318, 309)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")

        self.pushButton = QtWidgets.QPushButton("pushButton", self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(120, 40, 85, 27))
        self.pushButton.clicked.connect(self.OpenShutter)

        self.pushButton_2 = QtWidgets.QPushButton("pushButton_2", self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(120, 150, 85, 27))
        self.pushButton_2.clicked.connect(self.CloseShutter)

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 318, 20))
        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.pushButton.setText(_translate("MainWindow", "Open"))
        self.pushButton_2.setText(_translate("MainWindow", "Close"))

    def CloseShutter(self):
        print("Shutter Closed")
        self.ser.write(int(0))



    def OpenShutter(self):
        print("Shutter Opened")
        self.ser.write(int(77))


if __name__ == "__main__":
    ser = serial.Serial()
    ser.port = '/dev/ttyACM0'
    ser.timeout = 1
    ser.baudrate = 9600
    if ser.isOpen() == False:
        ser.open()
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow, ser)
    MainWindow.show()
    sys.exit(app.exec_())

Answer 1

问题是 ser 不是 class 的成员，因此它只会存在于方法的上下文中，而不存在于 class 的上下文中。

最推荐的是不修改设计，创建一个实现逻辑的class，并在其中class将class的成员添加到serial对象中。所以建议不要修改Ui_MainWindowclass，恢复到初始状态

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        QtWidgets.QMainWindow.__init__(self, parent)
        self.setupUi(self)

        self.ser = serial.Serial()
        self.ser.port = '/dev/ttyACM0'
        self.ser.timeout = 1
        self.ser.baudrate = 9600
        if self.ser.isOpen() == False:
            self.ser.open()

    def CloseShutter(self):
        print("Shutter Closed")
        self.ser.write(int(0))

    def OpenShutter(self):
        print("Shutter Opened")
        self.ser.write(int(77))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

Pyqt5 接口 Arduino 伺服 ErrorType“对象没有属性 'ser'”

Pyqt5 to interface Arduino servo ErrorType " object has no attribute 'ser'"

python

arduino

pyqt

pyserial

pyqt5