python udp报文接收

# coding=utf-8
#!/usr/bin/env python



from PyQt5.QtCore import QPoint, QRect, QSize, Qt
from PyQt5.QtWidgets import (QApplication, QLayout, QPushButton, QSizePolicy,QVBoxLayout,
        QWidget)
from PyQt5.Qt import QTextEdit, QLineEdit
from PyQt5.QtNetwork import *  
import struct
import datetime


def num2Ip(num):
    ip = "%d.%d.%d.%d" % ((num>>24)&0xff,(num>>16)&0xff,(num>>8)&0xff,num&0xff)
    return ip

class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        
        self.fp = open("test.log","w")
        flowLayout = QVBoxLayout()
        self.ip = QLineEdit()
        self.textEdit  = QTextEdit()
        self.textEdit.setReadOnly(True)
        self.btn = QPushButton("清空日志")
        self.btn.clicked.connect(self.clearData)
        flowLayout.addWidget(self.btn)
        flowLayout.addWidget(self.textEdit)
        self.setLayout(flowLayout)

        self.setWindowTitle("日志监控")

        self.port = 7700  
        self.udpSocket = QUdpSocket(self)  
        self.udpSocket.readyRead.connect(self.dataReceive)
        result = self.udpSocket.bind(self.port)
        
   
    def clearData(self):
        self.textEdit.clear()
        
        
    def dataReceive(self):  
        while self.udpSocket.hasPendingDatagrams():  
            msglist = self.udpSocket.readDatagram(self.port)  
            msg = msglist[0]
            length = len(msg)
            if length == 23:
                chl_id,ip_num,slot_id,counter,receiveFrameMode,snr,offsetFreqStatus = struct.unpack('!BIHIBHI', msg[0:-5])
                time=datetime.datetime.now()
                text = (time,chl_id,num2Ip(ip_num),slot_id,counter,receiveFrameMode,snr,offsetFreqStatus)
                self.textEdit.insertPlainText(str(text))
                self.textEdit.insertPlainText("\r\n")
                self.fp.write(str(text) + "\r\n")

if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)
    mainWin = Window()
    mainWin.show()
    sys.exit(app.exec_())