通过 python 套接字发送 json.dumps()

Question

What I'm trying to create are a set of server and client scripts; the server script prompts a user for raw input, stores that input in a dictionary and converts it to json with the json.dumps() function. The converted dictionary is then stored in the jasonFile variable which is then sent to the client. The json dictionary is working but I'm struggling with the networking side of things.

Here is my server code:

def Main():
host = '0.0.0.0'
port = 5000
s.bind((host, port))
s.listen(5)

print "Server Started"


while True:
    addr = s.accept()
    print "Client Connected from IP: " + str(addr)
    serverMessage = "Connection Established: Would you like to download the Json dictionary?"
    s.send(serverMessage)
    clientReply = s.recv(1024)
    if clientReply in ['Y', 'y', 'Yes', 'yes', 'YES']:
        s.send(jasonFile)
        s.close()
    else:
        print "Connection from " + addr + " closed!"
        s.send("Connection Error!")
        s.close()

And here is my client code:

def Main():
    host = raw_input("Please enter the server IP you wish to connect to: ")
    port = 5000

    #define client to use socket module to connect via IPV4 and TCP only
    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    client.connect((host, port))

    serverMessage = client.recv(1024)
    print serverMessage

    clientReply = raw_input("Type 'Yes' To download dictionary")
    if clientReply in ['Y', 'Yes', 'y', 'yes', 'YES']:
            client.send(clientReply)
            jasonRecv = client.recv(1024)
            print jasonRecv
    else:
            client.close()
            print "Disconnected from server!"

I haven't gotten as far as converting the json data back to a string on the client yet because the server throws me an error when the client tries to connect.

The error message I get from IDLE is:

Server Started
Client Connected from IP: (<socket._socketobject object at 0x000000000401E048>, ('127.0.0.1', 34375))

Traceback (most recent call last): File "D:/Server.py", line 105, in <module>
Main()

File "D:/Server.py", line 94, in Main
s.send(serverMessage)

error: [Errno 10057] A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied

I thought I was defining the address to send data to in the addr variable, but apparently not?

Answer 1

Try:

conn, addr = s.accept()
...
conn.send(serverMessage)

ie replace s. calls with conn. which represents the accepted socket connection from the client.

From the Python socket API :

socket.accept()

Accept a connection. The socket must be bound to an address and listening for connections. The return value is a pair (conn, address) where conn is a new socket object usable to send and receive data on the connection, and address is the address bound to the socket on the other end of the connection.

Examples are provided at the end of the page.

Also see the Python Socket Programming Howto