Erlang在端口上接收消息
-module(helloworld).
-export([start/0,client/1]).
start() ->
spawn(fun() -> server(4000) end).
server(Port) ->
{ok, Socket} = gen_udp:open(Port, [binary, {active, false}]),
io:format("server opened socket:~p~n",[Socket]),
loop(Socket).
loop(Socket) ->
inet:setopts(Socket, [{active, once}]),
receive
{udp, Socket, Host, Port, Bin} ->
io:format("server received:~p~n",[Bin]),
gen_udp:send(Socket, Host, Port, Bin),
loop(Socket)
end.
client(N) ->
{ok, Socket} = gen_udp:open(0, [binary]),
io:format("client opened socket=~p~n",[Socket]),
ok = genudp:send(Socket, "localhost", 4000, N), Value = receive
{udp, Socket, , _, Bin} ->
io:format("client received:~p~n",[Bin]) after 2000 ->
0
end,
gen_udp:close(Socket),
Value.
