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Date: Thu, 04 Jul 2013 00:02:21 +0100
From: MRAB <python@mrabarnett.plus.com>
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Subject: Re: socket data sending problem
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On 03/07/2013 23:38, ollietempleman@aol.com wrote:
> im trying to do a simple socket test program for a school project using the socket module, but im having difficulty in sending data between the client and host program.
>
> so far all tutorials and examples have used something along the lines of:
>
>    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>    host = socket.gethostname()
>    port = 12345
>    s.connect((host, port))
>
>
> and received it on the server end with:
>
>    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>    host = ''
>    port = 12345
>    s.bind((host, port))
>    s.listen(1)
>    conn, addr = s.accept()
>    print ('client is at', addr)
>    data = conn.recv(5)
>    print(data)
>
> it all works fine, except for when i try to use:
>
>    s.send("hello")
>
> to send data between the client and server, i just get this error message:
>
>    >>>
>    Traceback (most recent call last):
>      File "C:/Users/Ollie/Documents/code/chatroom/client3.py", line 9, in <module>
>        s.send("hello")
>    TypeError: 'str' does not support the buffer interface
>    >>>
>
> if anyone can either show me what im doing wrong, what this means and what's causing it, or even better how to fix it it would be greatly appreciated
>
You didn't say which version of Python you're using, but I think that
you're using Python 3.

A socket handles bytes, not Unicode strings, so you need to encode the
Unicode strings to bytes before sending, and decode the bytes to
Unicode strings after receiving.