Server Client Communication Python

Question

Server

import socket
import sys
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
host= 'VAC01.VACLab.com'
port=int(2000)
s.bind((host,port))
s.listen(1)
conn,addr =s.accept()
data=s.recv(100000)
s.close

CLIENT

import socket
import sys
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
host="VAC01.VACLab.com"
port=int(2000)
s.connect((host,port))
s.send(str.encode(sys.argv[1]))
s.close()

I want the server to receive the data that client sends.

I get the following error when i try this

CLIENT Side

Traceback (most recent call last): File "Client.py", line 21, in s.send(sys.argv[1]) TypeError: 'str' does not support the buffer interface

Server Side

File "Listener.py", line 23, in data=s.recv(100000) socket.error: [Errno 10057] A request to send or receive data was disallowed bec ause the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied

• Jesus is Lord: I think you may have to convert the str to bytes.
• Vinod K: Do i do this str.encode(sys.argv[1]) ?? i did that ,the errors have stopped but the data is not transferring.
• Jesus is Lord: Are you still having trouble?

Answer 1

In the server, you use the listening socket to receive data. It is only used to accept new connections.

change to this:

conn,addr =s.accept()
data=conn.recv(100000) # Read from newly accepted socket
conn.close()
s.close()

• Vinod K: Still giving the same error at the client side. The server error got resolved.
• Mahesha999: but their are recv() and send() methods on socket object.

Answer 2

Your line s.send is expecting to receive a stream object. You are giving it a string. Wrap your string with BytesIO.

• Vinod K: Do i do this str.encode(sys.argv[1]) ?? i did that ,the errors have stopped but the data is not transferring.

Answer 3

Which version of Python are you using? From the error message, I guess you are unintentionally using Python3. You could try your program with Python2 and it should be fine.

• Senthil Kumaran: Vinod - Try it with Python2 then to know the difference.

Answer 4

try to change the client socket to:

s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)