On 21/01/13 18:52, Pierre Massat wrote:
Assuming that i can find a description of this protocol, how would I use
it to communicate between Pd and Python ? I guess this more a question
to ask in a Python forum, but still, i'd love to have at least some hints...
In python use sockets... in Pd use [netreceive] - I'm sure there's loads
of good examples out there and I'm working on some pygtk for a project
(but it's still very very early). Menwhile this is a very minimal python
-> Pd example
Lorenzo.
Cheers,
Pierre.
2013/1/21 Jonathan Wilkes <[email protected] <mailto:[email protected]>>
----- Original Message -----
> From: Hans-Christoph Steiner <[email protected] <mailto:[email protected]>>
> To: [email protected] <mailto:[email protected]>
> Cc:
> Sent: Monday, January 21, 2013 11:17 AM
> Subject: Re: [PD] Pd --> Python, IPC, FUDI, pdreceive, et cetera !
>
>
> FUDI is not just netsend/netreceive, its all Pd messages,
including what
> pd-gui sends to pd. Its basically space-separated data
terminated with a
> semi-colon and a newline i.e. ;\n
Someone should add the description of the FUDI protocol to
the man pages for pdsend/pdreceive, since its not a standard
protocol and is slightly different from the messages people
are used to sending from within the gui (i.e., without a terminating
semicolon).
-Jonathan
>
> .hc
>
> On 01/21/2013 09:42 AM, Pierre Massat wrote:
>> Dear List,
>>
>> I've been working a lot with Python and Pd lately, and i would
like to
> have
>> better means of communication between the two.
>> I know next to nothing about inter-process communication, I know
nothing
>> about FUDI (except that it's the protocol used by pdsend and
> pdreceive),
>> and I have no idea what pdreceive was originally designed for. I've
> only
>> used the subprocess (formerly popen) module in python, but i
don't know
> how
>> to use it with streams of messages coming from the standard
output of a
>> running process.
>> I don't want to use libpd for now because i only need to send and
> receive
>> simple messages between Python and Pd.
>>
>> Can someone please provide a few hints ?
>>
>> Cheers!
>>
>> Pierre.
>>
>>
>>
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#N canvas 635 330 439 281 10;
#X floatatom 215 70 5 0 0 0 - - -;
#X obj 215 90 sel 0;
#X obj 242 114 print CONNECTION(S);
#X msg 215 134 DISCONNECTED;
#X obj 215 153 print --;
#X floatatom 54 94 5 0 0 0 - - -;
#X obj 40 147 print raw_tcp;
#X text 258 69 # of connections;
#X obj 54 70 route count foo;
#X floatatom 97 94 5 0 0 0 - - -;
#X text 38 183 Print the incoming tcp in the message window;
#X text 40 201 See http://en.wikipedia.org/wiki/FUDI for info about
the message format as well as the [netreceive] help;
#X obj 40 40 netreceive 54321;
#X connect 0 0 1 0;
#X connect 1 0 3 0;
#X connect 1 1 2 0;
#X connect 3 0 4 0;
#X connect 8 0 5 0;
#X connect 8 1 9 0;
#X connect 12 0 6 0;
#X connect 12 0 8 0;
#X connect 12 1 0 0;
#!/usr/bin/env python
"""
Simple example of sending a counter via TCP to Pure Data on localhost. In PD the
[netreceive] object must use the same port specified by TCP_PORT. Python sockets
part based on Python tcp documentation.
"""
import socket
import time
import sys
# TCP stuff
TCP_IP = '127.0.0.1'
TCP_PORT = 54321
BUFFER_SIZE = 1024
# A counter
counter = 0
# Try to open the connection to PD
print ("Opening connection on port %d") % (TCP_PORT)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print ("Connencting...")
try:
s.connect((TCP_IP, TCP_PORT))
print "Connected. Press CTRL + C to exit."
except socket.error as err:
# Exit on error
print "Could not connect. Aborting.\nError: %s" % (err)
sys.exit(1)
# A dictionary for possibly multiple messages
messages = {}
s.send ("Hello from Python!;")
while True:
try:
messages['count'] = counter
messages['foo'] = counter * 2
for k in messages.keys():
# Here the semicolon (";") is important!! See http://en.wikipedia.org/wiki/FUDI
message_string = ("%s %d;") % (k, messages[k])
print "Sending %s" % (message_string)
s.send(message_string)
counter += 1
time.sleep (1)
except KeyboardInterrupt:
# Press CTRL + C to stop.
s.send("Bye from python;")
time.sleep(0.2)
print "Closing connection"
s.close()
break
try:
s.close()
except:
pass
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