UdpClient.Receive troubles

[Mike Hildner]

Just playing with udp, was going to make two console apps, one to send a message the other to receive.

The example found under "UdpClient.Receive Method", just copied and pasted into an empty class, always gives me a SocketException: An invalid argument was supplied.

Can someone tell me what I'm missing?

Thanks,
Mike

[MagellanTX]

That example is a bad example. When you declare the UDPClient you need to bind it to the local end point.

Change your

Dim receivingUdpClient As New UdpClient

to something like this...

Dim receivingUdpClient As New UdpClient(New IPEndPoint(IPAddress.Parse("127.0.0.1"), 0))

HTH

[MagellanTX]

One more thing, the receive method is blocking so you might want to include that in a thread.

[Mike Hildner]

Thanks, MagellanTX, that did the trick. I've seen other bad examples from MSDN (specifically with Sockets), but I've been able to figure it out myself. Much appreciated.

FWIW, right now I don't care about the blocking business as it's just a test program. Once I figure out what I want, I'll either put it in a thread, or see if there's an asynchronous method available.

Thanks again,
Mike

[flycast]

MagellanTX: Thanks for this post!

Mike Hildner: Just out of curiosity, how did you finally solve the problem? Asyncronous or threaded?

[Mike Hildner]

I never took it very far, so never bothered with programming anything asynchronous. I've worked with asynchronous TCP sockets, though.

I was thinking of using UDP for notification when a 911 call came in in a dispatch center. That way, everyone who is subscribing can get a message. But now I'm thinking of using message queues or something, not really sure of the best way. Haven't gotten to that part of the project yet.