Python函数调用

Question

我有以下课程

class GUI( QtGui.QMainWindow ):
    '''
    classdocs
    '''
    """**********************************************************************"""
    """              Constructor                                             """
    """**********************************************************************"""
    def __init__( self, parent = None ):
          self.udpClass = MCUDP.MCUDP()

    def insertText( self, string ):
          string = time.ctime() + ': ' + string + '\n'
          self.messageField.insertPlainText( string )

我还在GUI类中创建了MCUDP类.我的问题是如何在MCUDP中访问GUI类insertText函数

更新

这是MCUDP

'''
Created on 09.06.2011

@author: robu
'''
import socket
import time
import MCGui;

class MCUDP( object ):
    '''
    classdocs
    '''
    """**********************************************************************"""
    """              UDP: Broadcasting                                       """
    """**********************************************************************"""
    def UDPBroadcast( self, ip = "255.255.255.255", UDPport = 15000, message = 'whoisthere', timeout = 10, TCPport = 30000 ):
        # ip="255.255.255.255" stands for a broadcast        
        ip = str( ip )
        s = socket.socket( socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP )
        s.setsockopt( socket.SOL_SOCKET, socket.SO_BROADCAST, True )
        s.settimeout( timeout )
        ownIP = socket.gethostbyname( socket.gethostname() )
        if message.upper() == 'WHOISTHERE':
            message = message + ';' + ownIP + ':' + str( TCPport )
        #print "Trying to send '%s' to IP %s, Port %s!" %(message, ip, port)
        #self.Eingang.put("Trying to send '%s' to IP %s, Port %s!" %(message, ip, UDPport))
        s.sendto( message, ( ip, UDPport ) )
        answer = "%s: '%s' broadcasted to %s!" % ( time.asctime(), message, ip )
        GUI.insertText( 'test' );
        #print answer
        s.close()
        return answer

Answer 1

您有两个需要相互通信的对象,这是一个相当标准的通信问题.有很多方法可以解决这个问题:

(1)依赖注入 - 使您的MCUDP()类在构造时需要MCGUI类.然后,您可以随时使用它:

class MCUDP(object):
    def __init__(self, gui): self.gui = gui
    def UDPBroadcast(...):
        # ... as necessary ...
        self.gui.insertText("YourText")

class MCGUI(...)
    def __init__( self, parent = None ):
        self.udpClass = MCUDP.MCUDP(self)

如果这样做,您的MCUDP类将依赖于实现self.gui该MCUDP使用的所有方法的对象.换句话说,MCUDP现在直接耦合到MCGUI类.当然,MCGUI类在某种程度上已经依赖于MCUDP.

(2)消息传递 - 在Qt,信号和插槽中.惯用的Qt路由使用消息而不是函数调用:

class MCGUI(...)
    def __init__( self, parent = None ):
        self.udpClass = MCUDP.MCUDP()
        self.connect(self.udpClass, PYSIGNAL("textUpdated"), self.insertText);

然后你只需要让你的MCUDP类成为一个QObject,这样它就可以发出事件:

class MCUDP(QObject):
    def __init__(self, parent = None):
        QObject.__init__(self, parent)
    def UDPBroadcast(...):
        # ... as necessary ...
        self.emit(PYSIGNAL("textUpdated"), ("yourText",))

这样做的好处是,现在MCUDP不需要了解有关MCGUI类的任何信息,这将使测试和未来的更改变得更容易.