1.使用tcp從伺服器獲取資料
end.2.乙個簡單的tcp伺服器
%%socket_server.erl:
-module(socket_server).
-export([start_nano_server/0,loop/1,nano_client_eval/1]).
start_nano_server() ->
=gen_tcp:listen(2345,[binary,,,]),
=gen_tcp:accept(listen),
gen_tcp:close(listen),
loop(socket).
loop(socket) ->
receive
->
io:format("server received binary =~p~n",[bin]),
str=binary_to_term(bin),
io:format("server (unpacked) ~p~n",[str]),
reply=lib_misc:string2value(str),
io:format("server replying=~p~n",[reply]),
gen_tcp:send(socket,term_to_binary(reply)),
loop(socket);
->
io:format("server socket closed~n")
end.
nano_client_eval(str) ->
=gen_tcp:connect("localhost",2345,[binary,]),
ok=gen_tcp:send(socket,term_to_binary(str)),
receive
->
io:format("client received binary =~p~n",[bin]),
val=binary_to_term(bin),
io:format("client result =~p~n",[val]),
gen_tcp:close(socket)
end.
4.注意點:
5.主動和被動套接字
6.套接字錯誤處理
7.udp
%應用示例:乙個udp階乘伺服器
-module(udp_test).
-export([start_server/0,client/1]).
start_server() ->
spawn(fun() -> server(4000) end).
%伺服器
server(port) ->
=gen_udp:open(port,[binary]),
io:format("server opened socket:~p~n",[socket]),
loop(socket).
loop(socket) ->
receive
=msg ->
io:format("server received:~p~n",[msg]),
n=binary_to_term(bin),
fac=fac(n),
gen_udp:send(socket,host,port,term_to_binary(fac)),
loop(socket)
end.
fac(0)->1;
fac(n) ->n* fac(n-1).
%客戶端
client(n) ->
=gen_udp:open(0,[binary]),
io:format("client opened socket=~p~n",[socket]),
ok=gen_udp:send(socket,"localhost",4000,term_to_binary(n)),
value=receive
=msg ->
io:format("client received:~p~n",[msg]),
binary_to_term(bin)
after 2000 ->
0end,
gen_udp:close(socket),
value.
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