python - Python s.recv()返回空字符串

Question

我在在线教程中找到了一个简单的客户端和服务器

#server.py        

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = 'localhost' # Get local machine name
port = 12345                # Reserve a port for your service.
s.bind((host, port))        # Bind to the port  
s.listen(5)                 # Now wait for client connection.
while True:
   c, addr = s.accept()     # Establish connection with client.
   print 'Got connection from', addr
   c.send('Thank you for connecting')
   c.close()                # Close the connection

#client           # This is client.py file

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = 'localhost' 
port = 12345                # Reserve a port for your service.

s.connect((host, port))
print s.recv(1024)
s.close                     # Close the socket when done

当我运行c lient.py时，它所做的就是在应打印时打印一个空字符串(“谢谢您的连接”)。当我从telnet连接localhost 12345时，它会很好地发送消息，所以我不知道为什么我的客户端没有收到消息

有什么想法吗。我是套接字编程的新手，很想找到一个解决方案，所以我可以继续。

Answer 1

按原样运行脚本时，出现此错误:

Waiting connections ...
Got connection from ('127.0.0.1', 63875)
Traceback (most recent call last):
  File "serv.py", line 14, in <module>
    c.send('Thank you for connecting')
TypeError: a bytes-like object is required, not 'str'

这里的几件事:

确保您发送的是bytes而不是str。您可以通过将第14行替换为:

c.send(b'Thank you for connecting')

同样，这样声明套接字s总是很有用的:

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

进一步阅读:

Py2:https://docs.python.org/2/library/socket.html

Py3:https://docs.python.org/3/library/socket.html

希望它能起作用! :)