#Using packet sender to get ascii html pro
The original code works for me on Windows 2000 (1 network adapter), but fails under XP Pro (pre-SP2, 3 adapters though 2 are disabled).
close() 40 return dataĪt this point, I'm beginning to think: "Python multicast simply does not work."Īre you running on Windows 2000/XP (pre-SP2)/Server 2003 with more than one network adapter? If so, the problem is Windows, not Python. inet_aton( intf)) 35 36 # Receive the data, then unregister multicast receive membership, then close the port 37 data, sender_addr = s. bind(( ' ', port)) 30 31 # Set some more multicast options 32 intf = socket.
IP_MULTICAST_LOOP, 1) 27 28 # Bind to the port 29 s. SO_REUSEPORT, 1) 23 except AttributeError: 24 pass # Some systems don't support SO_REUSEPORT 25 s. SOCK_DGRAM) 18 19 # Set some options to make it multicast-friendly 20 s. IP_MULTICAST_TTL, 20) # Change TTL (=20) to suit 10 # Send the data 11 s. SOCK_DGRAM) 8 # Make the socket multicast-aware, and set TTL. 2 import socket 3 4 def send( data, port= 50000, addr= ' 239.192.1.100 '): 5 """send(data]) - multicasts a UDP datagram.""" 6 # Create the socket 7 s = socket. Try these examples:ġ # UDP multicast examples, Hugo Vincent. The above multicasting examples do not work on my computer, but I was able to fix them using code from. There may be other ways for the "socket to network interface" mapping to be defined, but I forget what they are. This will work OK if there is a multicast route setup in the IP routing table But without a bind() nor route, the kernel will not determine which network interface to send the data on, and will return an error. Note the above example is missing a bind() call. (You might want to reconsider the IP_MULTICAST_TTL setting here - the recommended value for local-network multicasts is 32 indicates multicasts which should traverse onto the Internet - Asgeir S. Kragen Sitaker 07:03:00)ġ import socket 2 3 sock = socket.
#Using packet sender to get ascii html 64 bits
Both the old version and the new version work on my 32-bit machine, but the Python documentation for the struct module suggests that "l" would be 64 bits on an LP64 or LPI64 platform without it, so I thought it would be prudent to add. (I added an "=" to the "4sl" struct packing. (I've corrected the mreq according to the comment below - Sebastian Setzer 14:28:00) (The example below has been updated to work - Steven Spencer 13:19:00) I've been googling for some time now, and still have yet to find a working example of Python multicast listening. It worked on my machine, but I have yet to try it running on different machines. The official example of multicast can be found at /usr/share/doc/python2.3/examples/Demo/sockets/mcast.py (at least on Debian Sarge, after apt-get install python-examples). In that case, consider TFTP for python or UDT for python That being said, sometimes you need to use UDP, e.g. In effect, to get something reliable you'll need to implement something similar to TCP on top of UDP, and you might want to consider using TCP instead. So you'll have to handle packets getting lost and packets arriving out of order. file transfers, keep in mind that UDP is not reliable. If considering extending this example for e.g. recvfrom( 1024) # buffer size is 1024 bytes 12 print( " received message: %s " % data) bind(( UDP_IP, UDP_PORT)) 9 10 while True: 11 data, addr = sock.
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