[英]Detect change in a global variable
I'm making a GUI with pyqt5 and have qlcdnumber to display a variable which I retrieve from an Android app through a socket server. 我正在使用pyqt5制作GUI,并使用qlcdnumber来显示我通过套接字服务器从Android应用检索的变量。 The problem is I can't find any method to display the variable that I have in the qlcdnumber. 问题是我找不到任何方法来显示我在qlcdnumber中拥有的变量。
Here is the UI code, I tried to use signal but didn't work. 这是UI代码,我尝试使用信号但没有用。
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)
and I have variables that I want to set to be displayed in the qlcdnumber; 我有一些要设置为在qlcdnumber中显示的变量;
global speed, angle
server = socketserver.TCPServer((ip, port), MyTCPHandler)
server.serve_forever()
and inside the main GUI im calling the Ui_AppWindow gui, but i need the qlcdnumber to be updated with the value of the global variable speed and angle each time they are changed. 并在主GUI中即时调用Ui_AppWindow gui,但每次更改时,我都需要使用全局可变速度和角度的值来更新qlcdnumber。
The easiest way to do this would just to make functions that are always used to set the values of the global variables in your program, like so: 执行此操作的最简单方法是制作始终用于设置程序中全局变量值的函数,如下所示:
def set_speed(val):
global speed
speed = val
# ... whatever other logic you'd like to perform
def set_angle(val):
# ...
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