檢測全局變量的變化

Question

我正在使用pyqt5制作GUI，並使用qlcdnumber來顯示我通過套接字服務器從Android應用檢索的變量。 問題是我找不到任何方法來顯示我在qlcdnumber中擁有的變量。

這是UI代碼，我嘗試使用信號但沒有用。

class MyTCPHandler(socketserver.StreamRequestHandler):
    def handle(self):
        while True:
            global angle, strength ,speed, a
            if(not enabled):
                # self.rfile is a file-like object created by the handler;
                # we can now use e.g. readline() instead of raw recv() calls
                self.data = self.rfile.readline().strip()
                if(a==0):
                    print("{} wrote:".format(self.client_address[0]))
                    a+=1
                data = self.data.decode("utf-8").rstrip().strip("\n")
                if(data!= ""):
                    if(data == "disconnect"):
                        print("restarting")
                        self.close()
                        sleep(1)
                        mainServer()
                    elif(data == "shutdown"):
                        p = subprocess.Popen("sudo shutdown -h now", shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
                        print(p)
                    else:    
                        temp = data.split(":")
                        angle = int(temp[0])
                        strength = int(temp[1])
                        speed = float(temp[2])


class Ui_AppWindow(QtWidgets.QWidget):

    def __init__(self):
        super(Ui_AppWindow, self).__init__()
        self.setStyleSheet('background-color:#efefef; color:white;')
        global add, angle, speed

        self.layout = QtWidgets.QVBoxLayout()

        self.label = QtWidgets.QLabel("\t\t"+add)
        self.label.setStyleSheet("color: #005C99;")
        self.layout.addWidget(self.label)

        palette = QtGui.QPalette()
        palette.setColor(palette.WindowText, QtGui.QColor(85, 85, 255))
        palette.setColor(palette.Background, QtGui.QColor(0, 170, 255))
        palette.setColor(palette.Light, QtGui.QColor(0, 92, 153))
        palette.setColor(palette.Dark, QtGui.QColor(0, 92, 137))

        self.speed = QtWidgets.QLCDNumber(self)
        self.speed.setGeometry(QtCore.QRect(100, 100, 64, 23))
        self.speed.setObjectName("speed")
        self.speed.display(speed)
        self.speed.setPalette(palette)

        self.angle = QtWidgets.QLCDNumber(self)
        self.angle.setGeometry(QtCore.QRect(200, 100, 64, 23))
        self.angle.setObjectName("angle")
        self.angle.display(angle)
        self.angle.setPalette(palette)

        self.speed_lable = QtWidgets.QLabel("Speed")
        self.speed_lable.setGeometry(QtCore.QRect(100, 70, 47, 25))
        self.speed_lable.setObjectName("speed_lable")
        self.speed_lable.setStyleSheet('color:#00497a;')

        self.angle_lable = QtWidgets.QLabel("Angle")
        self.angle_lable.setGeometry(QtCore.QRect(200, 70, 47, 25))
        self.angle_lable.setObjectName("angle_lable")
        self.angle_lable.setStyleSheet('color:#00497a;')

        self.hbl = QtWidgets.QHBoxLayout()
        self.hbl.addWidget(self.speed_lable)
        self.hbl.addWidget(self.angle_lable)
        self.layout.addLayout(self.hbl)

        self.hb = QtWidgets.QHBoxLayout()
        self.hb.addWidget(self.speed)
        self.hb.addWidget(self.angle)
        self.layout.addLayout(self.hb)

        self.setWindowTitle("RasControl GUI: Android Control")
        self.setLayout(self.layout)
        self.setGeometry(100, 100, 400, 200)


    def setAngle(self):
        global angle
        self.angle.display(angle)        

    def setSpeed(self):
        global speed
        self.speed.display(speed)

我有一些要設置為在qlcdnumber中顯示的變量；

global speed, angle
server = socketserver.TCPServer((ip, port), MyTCPHandler)
server.serve_forever()

並在主GUI中即時調用Ui_AppWindow gui，但每次更改時，我都需要使用全局可變速度和角度的值來更新qlcdnumber。

Answer 1

執行此操作的最簡單方法是制作始終用於設置程序中全局變量值的函數，如下所示：

def set_speed(val):
    global speed
    speed = val
    # ... whatever other logic you'd like to perform

def set_angle(val):
    # ...