如何将TCP客户端连接到服务器并发送到服务器端?遇到错误,无法成功运行代码。

时间:2018-10-25 02:34:58

标签: python tcp connect tcpclient tcpserver

我正在学习TCP,正在尝试一个客户端/服务器程序。我的服务器端正在工作,但是在客户端,我无法成功连接到服务器端。

客户端的错误代码

第一个错误:

回溯(最近通话最近):   在第13行的文件“ tcpclient.py”中     clientSocket.connect(((serverName,serverPort)) TypeError:应为str,字节或字节数组,而不是列表

第二个错误:

回溯(最近通话最近):   在第34行的文件“ tcpclient.py”中     clientSocket.send(clientSentence.encode(),serverAddress) TypeError:必须为整数(元组类型为元组)

服务器代码:此代码成功运行。

import sys
from socket import*

serverSocket = socket(AF_INET, SOCK_STREAM)
serversys = sys.argv

if len(serversys) == 1: 
    serverPort = 9999
else:
    serverPort = serversys[1]
    serverPort = int(serverPort)

serverSocket.bind(('', serverPort)) 
serverSocket.listen(1)
print ("The server is ready to receive.")

while True:
    connectionSocket, addr = serverSocket.accept()
    print ("Connection accepted from: ", addr)

    clientSentence = connectionSocket.recv(1024).decode()


    clientSentence, clientAddress = serverSockset.recv(1024)
    clientSentence.decode()
    connectionSocket.close()

    if clientSentence[0].decode() == 'U':
        serverSentence = clientSentence.upper()
        connectionSocket.send(serverSentence[1:].encode(), clientAddress)
        connectionSocket.close()
    elif clientSentence[0].decode() == 'L':
        serverSentence = clientSentence.lower()
        connectionSocket.send(serverSentence[1:].encode(), clientAddress)
        connectionSocket.close()
    elif clientSentence[0].decode() == 'I':
        serverSentence = clientSentence.title()          
        connectionSocket.send(serverSentence[1:].encode(), clientAddress)
        connectionSocket.close()

客户端:这是发生两个错误的地方。

import sys
from socket import*

clientSocket = socket(AF_INET, SOCK_STREAM)

clientsys = sys.argv
serverName = clientsys[1:]
serverPort = clientsys[2:]

clientSocket.connect((serverName, serverPort)) #First Error

serverPort = [int(serverPort) for serverPort in serverPort]
serverAddress = (serverName, serverPort)

sentenceChoice = input("Enter U for UPPERCASE SENTENCE, L for lowercase sentence, \nor I for Initial Caps Sentence: ")
sentence = input("Enter sentence: ")

clientSentence = sentenceChoice+sentence

clientSocket.send(clientSentence.encode(), serverAddress) #Second Error
serverSentence = clientSocket.recv(1024)
print('From Server: ', serverSentence.decode())
clientSocket.close()

3 个答案:

答案 0 :(得分:1)

您确定它应该是clientsys [2:]而不是clientsys [2]吗?

答案 1 :(得分:1)

发生错误的原因是您正在使用列表切片从sys.argv中查找服务器和端口:

clientsys[1:]
clientsys[2:]

列表切片操作的结果始终是列表:

l = [1, 2, 3]
>>>l[1:]
[2, 3]
>>>print(l[2:])
>>>[3]

相反,使用索引:

serverName = clientsys[0]
serverPort = clientsys[1]

答案 2 :(得分:1)

您的第一个错误是由您使用服务器名称和端口的列表片引起的。更改为此:

serverName = clientsys[1]
serverPort = clientsys[2]

您的第二个错误是因为socket.send()不接受serverAddress元组参数(您想到socket.sendto()的地方吗?无论哪种方式,都可以通过删除参数来解决:

clientSocket.send(clientSentence.encode())

链接到socket.send文档:https://docs.python.org/3/library/socket.html#socket.socket.send