Python /套接字：如何将文件发送到其他网络上的另一台计算机？

Question

The codes below work if the computers are on the same network. However if these computers are on different networks, the connection timed out.

The codes of server.py are:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("192.168.1.**", 12345))

s.listen(10)
c, addr = s.accept()
print('{} connected.'.format(addr))

f = open("image.jpg", "rb")
datas = f.read(1024)

while datas:
    c.send(datas)
    datas = f.read(1024)

f.close()
print("Done sending...")

And the client.py includes:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("192.168.1.**", 12345))

f = open("recieved.jpg", "wb")

while True:
    datas = s.recv(1024)
    while datas:
        f.write(datas)
        datas = s.recv(1024)
    f.close()
    break
print("Done receiving")

I read that, the problem can rise from modem settings. Then i closed the firewall of the network which server.py connected on. But still the computer which client.py file is in, can't connect to the other computer.

What should i do, to connect these computers?

Thanks in advance.

Answer 1

Try this:

server.py :

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket
import os

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("", 12345)) #if the clients/server are on different network you shall bind to ('', port)

s.listen(10)
c, addr = s.accept()
print('{} connected.'.format(addr))

f = open("image.jpg", "rb")
l = os.path.getsize("image.jpg")
m = f.read(l)
c.send_all(m)
f.close()
print("Done sending...")

client.py :

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("server_public_ip", 12345)) # here you must past the public external ipaddress of the server machine, not that local address

f = open("recieved.jpg", "wb")
data = None
while True:
    m = s.recv(1024)
    data = m
    if m:
        while m:
            m = s.recv(1024)
            data += m
        else:
            break
f.write(data)
f.close()
print("Done receiving")

note : on your server.py you are waiting for 10 clients but you accept only one connection you shall put the c, addr = s.accept() in a while loop

Update : If the clients/server are behind a rooter then you have to forward the port on the rooter for that connection

Port Forwarding :

Works only WITH python 2.X

i've made myself a script to forward port on every OS but the script it too long you can grab it here

then in server.py :

from port_forwarding import forward_port

and before s = socket.socket ### put

forward_port(port, 'description')

don't forget to put the port_forwarding script in the same folder of sever.py