[erlang-questions] Flash client communication with Erlang Server problem

Johnny Billquist <>
Mon Jan 5 01:44:32 CET 2009


Have you tried running tcpdump or something similar to verity that you 
actually send what you think?

	Johnny

Ryan Lepidi wrote:
> This is an erlang problem, it seems. I have this code to test the client 
> sending data, written in Actionscript 3:
> 
> Code:
> var socket:Socket=new Socket("localhost", 2345);
> socket.addEventListener(Event.CONNECT, connected);
> 
> private function connected(event:Event):void {
>     socket.writeInt(12); //packet length, should be correct? 4 bytes each?
>     socket.writeInt(3);
>     socket.writeInt(6);
>     socket.writeInt(9);
>     socket.flush();
> }
> 
> 
> Then I have this small server, written in Erlang:
> 
> Code:
> start_nano_server() ->
>     {ok, Listen} = gen_tcp:listen(2345, [binary, {packet, 0},
>                                  {reuseaddr, true},
>                                  {active, true},
>                                 {packet_size, 128}]),
>     {ok, Socket} = gen_tcp:accept(Listen),
>     gen_tcp:close(Listen),
>     receive_data(Socket, []).
> 
> receive_data(Socket, SoFar) ->
>     receive
>     {tcp,Socket,Bin} ->   
>         receive_data(Socket, [Bin|SoFar]);
>     {tcp_closed,Socket} ->
>         Bytes=list_to_binary(reverse(SoFar)),
>         io:format("~p~n",[Bytes])
>     end.
> 
> 
> Now, no matter what I send from the client, I ALWAYS get 
> [<<0,0,0,4,0,0,0,32>>] as the response. I can try writing bytes to the 
> socket directly instead of ints, and I get the same thing. I can write 
> more or less data, same result. UTF strings same result. Even when 
> specifying "4" as the packet header length, I just get the same 
> consistant result of [<<0,0,0,32>>] instead. I don't understand what I'm 
> doing wrong here.
> 
> 
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> 
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