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From: Ihsan Junaidi Ibrahim <ihsan@grep.my>
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Subject: Python recv loop
Date: Mon, 11 Feb 2013 08:48:24 +0800
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Xref: csiph.com comp.lang.python:38625

Hi,

I'm implementing a python client connecting to a C-backend server and am =
currently stuck to as to how to proceed with receiving variable-length =
byte stream coming in from the server.

I have coded the first 4 bytes (in hexadecimal) of message coming in =
from the server to specify the length of the message payload i.e. =
0xad{...}

I've managed to receive and translate the message length until I reach =
my second recv which I readjusted the buffer size to include the new =
message length.

However that failed and recv received 0 bytes. I implemented the same =
algorithm on the server side using C and it work so appreciate if you =
can help me on this.

# receive message length
    print 'receiving data'
    mlen =3D sock.recv(4)
    try:
        nbuf =3D int(mlen, 16)
    except ValueError as e:
        print 'invalid length type'
        return -1

    while True:
        buf =3D sock.recv(nbuf)

        if not buf:
            break

    slen =3D len(buf)
    str =3D "{0} bytes received: {1}".format(slen, buf)
    print str=