Python recv loop
MRAB
python at mrabarnett.plus.com
Sun Feb 10 20:55:00 EST 2013
On 2013-02-11 00:48, Ihsan Junaidi Ibrahim wrote:
> 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 = sock.recv(4)
> try:
> nbuf = int(mlen, 16)
> except ValueError as e:
> print 'invalid length type'
> return -1
>
> while True:
> buf = sock.recv(nbuf)
>
> if not buf:
> break
>
> slen = len(buf)
> str = "{0} bytes received: {1}".format(slen, buf)
> print str
>
You should keep reading until you get all need or the connection is
closed:
buf = b''
while len(buf) < nbuf:
chunk = sock.recv(nbuf - len(buf))
if not chunk:
break
buf += chunk
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