Python QTimer和带有Qt的图形用户界面(GUI)应用程序是如何协同工作的

Question

我启动了计时器，并以1秒的间隔连接到函数调用"read_file"。然而，GUI界面并没有出现。我不明白Python QTimer和QT GUI是如何协同工作的？我该怎么做才能弹出GUI页面并显示ping状态。如果有任何帮助，我将不胜感激。

import sys
from reachable_gui import *
import subprocess
import threading
import time
from PyQt5.QtCore import QTimer
import os
def signal(self):

self.Button_Manual.clicked.connect(Manual)
self.Button_Pdf.clicked.connect(Pdf)
read_file(self)

def Manual():
pass
def Pdf():
pass

def read_file(self):
{
#read line by line IP and device from a file and pass it to ping()
}
timer = QtCore.QTimer()
timer.timeout.connect(self.read_file)
timer.setInterval(1000)
timer.start()

def ping(self,IP,name):
{ 
# ping the device and update GUI status.
}

Ui_MainWindow.ping = ping
Ui_MainWindow.signal = signal
Ui_MainWindow.Manual = Manual
Ui_MainWindow.Pdf = Pdf
Ui_MainWindow.read_file = read_file
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
ui.signal()
MainWindow.show()
sys.exit(app.exec_())

Answer 1

我不知道这是否能帮助您解决问题，但这是如何多次使用QTimer运行函数的示例。

但若函数运行的时间更长，那个么它可能会创建更长的间隔。

import sys
from PyQt5.QtCore import QTimer
from PyQt5 import QtWidgets
import datetime
#import time

def read_file():
#time.sleep(2) # simulate long-running function

current_time = datetime.datetime.now().strftime('%Y.%m.%d - %H:%M:%S')
label.setText(current_time)

print('current_time:', current_time)

if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QMainWindow()

# some GUI in window
label = QtWidgets.QLabel(window, text='???')
window.setCentralWidget(label)
window.show()

# timer which repate function `read_file` every 1000ms
timer = QTimer()
timer.timeout.connect(read_file)
timer.setInterval(1000)
timer.start()

sys.exit(app.exec())