Question

我试图用Python编写客户端服务器应用程序，但是我遇到了一个问题，在客户端我没有得到所有发送的数据。首先我尝试发送1到10的数字，然后收到1,2,5,6,10，所以缺少很多数字。

服务器端：

def __init__( self ):
        super( MCCommunication, self ).__init__()

        HOST, PORT = socket.gethostbyname( socket.gethostname() ), 31000
        self.server = SocketServer.ThreadingTCPServer( ( HOST, PORT ), MCRequestHandler )
        ip, port = self.server.server_address        
        # Start a thread with the server
        # Future task: Make the server a QT-Thread...
        self.server_thread = threading.Thread( target = self.server.serve_forever )
        # Exit the server thread when the main thread terminates
        self.server_thread.setDaemon( True )
        self.textUpdated.emit( 'Server Started!' )
        print( 'Server Started!' )
        self.server_thread.start() 

def handle( self ):       
        #self.request.setblocking( 0 )
        i = 10;
        while True:
            if( self.clientname == 'MasterClient' ):                
                try:                    
                    #ans = self.request.recv( 4096 )
                    #print( 'after recv' )   
                    """    Sendign data, testing purpose    """                 
                    while i:
                        mess = str( i );            
                        postbox['MasterClient'].put( self.creatMessage( 0, 0 , mess ) )
                        i = i - 1

                    while( postbox['MasterClient'].empty() != True ):                        
                        sendData = postbox['MasterClient'].get_nowait()                        

                        a = self.request.send( sendData )
                        print( a );
                        #dic = self.getMessage( sendData )
                        #print 'Sent:%s\n' % str( dic )                         
                except:                    
                    mess = str( sys.exc_info()[0] )
                    postbox['MasterClient'].put( self.creatMessage( 1, 0 , mess ) )
                    pass

    def creatMessage( self, type1 = 0, type2 = 0, message = ' ', extra = 0 ):        
        return pickle.dumps( {"type1":type1, "type2":type2, "message":message, "extra":extra} );

postbox['MasterClient']是带序列化消息的队列。

这是客户：

def run( self ):        
        sock = socket.socket( socket.AF_INET, socket.SOCK_STREAM )        
        addr = ( self.ip, self.port )        
        #print addr
        sock.connect( addr )
        #sock.setblocking( 0 )
        while True:         
            try:   
                ans = sock.recv( 4096 )                
                dic = self.getMessage( ans )               
                self.recvMessageHandler( dic )  
                print 'Received:%s\n' % str( dic )       
            except:
               pass

Answer 1

服务器可能在客户端尝试读取它们时发送了多条消息，如果这些消息符合相同的4k缓冲区，recv()调用将获得这两个消息。

您没有显示getMessage代码，但我猜您正在执行类似pickle.loads(msg)的操作，但这只会给您第一条消息并丢弃其余的字符串，因此丢弃的消息。如果在读取时缓冲超过4096个字节，您还会遇到另一个问题，因为您最终可能会得到一条消息片段，从而导致出现错误的错误。

你需要拆分你回到单独消息中的字符串，或者更好，只需将套接字视为一个流，让pickle.load从中拉出一条消息。

Python丢失了包

1 个答案: