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Old 06-22-2007, 04:58 PM
Steve_HT Steve_HT is offline
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Join Date: Jan 2007
Posts: 13
Generic UDP or TCP/IP function

Does Vizard have in place in a generic TCP/IP protocol as part of the networking package, or is it presently configured only for the Vizard Networking communications?

If there is not such a protocol, how difficult would it be to create? I'd like to port data from a set of XServes across either TCP/IP or UDP to drive the hand and other objects in my environment.
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Old 06-22-2007, 05:04 PM
farshizzo farshizzo is offline
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Join Date: Mar 2003
Posts: 2,849
Hi,

The networking feature built-in to Vizard uses UDP, but the data is "pickled" before it is sent. This makes it difficult to communicate with non-Python programs, which I assume is what you are doing. If you want to receive raw data over a socket then you can use the Python socket library. Here is some sample code:
Code:
import viz
viz.go()

import socket

#The maximum amount of data to receive at a time
MAX_DATA_SIZE = 1024

#The port to send/receive data on
PORT = 4999

#Get the name of this computer
COMPUTER_NAME = socket.gethostname()

#Get the IP address of this computer
COMPUTER_IP_ADDRESS = socket.gethostbyname('localhost')

#Create a socket to send data over
OutSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
OutSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

#Create a socket to receive data from
InSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
InSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
InSocket.bind(('', PORT))
InSocket.setblocking(0)

def SendData(data):
	OutSocket.sendto(data,(COMPUTER_IP_ADDRESS,PORT))
	
def ReceiveData():
	try:
		return InSocket.recv(MAX_DATA_SIZE)
	except socket.error:
		#Insert error handling code here
		pass

vizact.onkeydown(' ',SendData,'hello there')

def CheckSocket():
	#Try to receive data from socket
	data = ReceiveData()
	if data:
		print 'Received Message:',data
vizact.ontimer(0,CheckSocket)
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