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POpython odd multicast socket exception
 

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  1. POpython odd multicast socket exception
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    <p>I have some example python code that I got from another stack overflow answer (can't remember where), that implements multicasting. The following code should set up a socket object for receiving multicast packets. I encapsulated it in a class like so:</p> <p><code> class Multisock:</p> <pre><code>def __init__(self, MCAST_GRP, MCAST_PORT, packsize): import socket import struct self.MCAST_GRP = MCAST_GRP self.MCAST_PORT = MCAST_PORT self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) self.sock.bind(('', MCAST_PORT)) mreq = struct.pack("4sl", socket.inet_aton(MCAST_GRP), socket.INADDR_ANY) self.sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq) </code></pre> <p></code></p> <p>However, this gives me this error:</p> <p><code></p> <pre><code>Traceback (most recent call last): File "./Audiorecv.py", line 41, in &lt;module&gt; sock = MulticastNetworking.Multisock('244.1.1.1', 5007, chunk) File "/home/wheybags/Multicast-Voice-Chat/MulticastNetworking.py", line 30, in __init__ self.sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq) File "/usr/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) socket.error: [Errno 22] Invalid argument </code></pre> <p></code></p> <p>Which is really confusing because if I just set MCAST_GRP statically to a string representing an ip, it works, but it gives the error above if I try to use a constructor argument.</p>
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      1. USMark Tolonen
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    1. COWhat happens if you use this? `mreq = struct.pack("=4sl", socket.inet_aton(MCAST_GRP), socket.INADDR_ANY)`
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      1. USMike Pennington
    2. COStill gives the same error
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      1. USwheybags
    3. COMake sure you provide a valid [multicast address](http://en.wikipedia.org/wiki/Multicast_address#IPv4) or you get that error. 244.1.1.1 is not valid, possible typo.
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