問題描述

我正在嘗試制作一個(gè)接收 UDP 數(shù)據(jù)并使用 python (PyQt5) 在列表視圖中顯示數(shù)據(jù)的應(yīng)用程序.當(dāng)我啟動(dòng)接收器時(shí)，應(yīng)用程序卡住并且沒有響應(yīng).我怎樣才能解決這個(gè)問題?請參閱下面的代碼.

I'm trying to make an app that receives UDP data and shows the data in a list view using python (PyQt5). When I start the receiver, the app gets stuck and does not respond. How can I fix this? See code below.

import sys
import os
import socket
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class udpReceiverApp():
     app = QApplication (sys.argv)
     x = 1
     ip = "192.168.1.4"
     port =515
     server_start = True
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     sock.bind((ip,port))

     def __init__(self):
         self.w = QWidget()
         self.lbl = QLabel ("udp receiver",self.w)
         self.btn = QPushButton ("click me",self.w)
         self.lst = QListWidget(self.w)
         self.lst.resize(200,100)

         self.lbl.move(10, 90)
         self.btn.move(50, 50)
         self.lst.move(10, 90)

         self.btn.clicked.connect(self.startReceiver)

         self.w.setGeometry(300, 300, 300, 200)
         self.w.setWindowTitle("udp receive")
         self.w.show()
         sys.exit(udpReceiverApp.app.exec_())

     def addLstItem(self):
         self.lst.insertItem(0,"item"+str(udpReceiverApp.x) )
         udpReceiverApp.x +=1

     def startReceiver(self):

         while udpReceiverApp.server_start:
               data, addr = self.sock.recvfrom(1024)
               self.lst.insertItem(0,data)

udpReceiverApp()

推薦答案

你不應(yīng)該在主線程中有無限循環(huán)，因?yàn)樗鼤?huì)鎖定 Qt 事件循環(huán)，而應(yīng)該在另一個(gè)線程中執(zhí)行它并通過信號發(fā)送信息

You should not have an infinite loop in the main thread since it locks the Qt event loop, instead you should execute it in another thread and send the information through signals

import sys
import os
import socket
from PyQt5 import QtCore, QtWidgets

class UDPWorker(QtCore.QObject):
    dataChanged = QtCore.pyqtSignal(str)

    def __init__(self, parent=None):
        super(UDPWorker, self).__init__(parent)
        self.server_start = False

    @QtCore.pyqtSlot()
    def start(self):
        self.server_start = True
        ip = "192.168.1.4"
        port = 515
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock.bind((ip,port))
        self.process()

    def process(self):
        while self.server_start:
            data, addr = self.sock.recvfrom(1024)
            self.dataChanged.emit(str(data))

class UDPWidget(QtWidgets.QWidget):
    started = QtCore.pyqtSignal()

    def __init__(self, parent=None):
        super(UDPWidget, self).__init__(parent)
        btn = QtWidgets.QPushButton("Click Me")
        btn.clicked.connect(self.started)
        self.lst = QtWidgets.QListWidget()

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(QtWidgets.QLabel("udp receiver"))
        lay.addWidget(btn)
        lay.addWidget(self.lst)

        self.setWindowTitle("udp receive")

    @QtCore.pyqtSlot(str)
    def addItem(self, text):
        self.lst.insertItem(0, text)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = UDPWidget()
    worker = UDPWorker()
    thread = QtCore.QThread()
    thread.start()
    worker.moveToThread(thread)
    w.started.connect(worker.start)
    worker.dataChanged.connect(w.addItem)
    w.show()
    sys.exit(app.exec_())

這篇關(guān)于如何編寫一個(gè)無限循環(huán)來接收UDP數(shù)據(jù)?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！