通过TCP Erlang接收错误的数据

时间:2013-08-12 22:40:44

标签: tcp functional-programming erlang

我正在尝试通过TCP套接字接收一些数据。当我运行下面的代码时,我得到输出:localhost ^ V ^ A ^ @,我知道你需要转换数据,如果使用二进制发送它,但因为我发送一个列表我认为它会收到相同的?为什么主机字符串显示正确但其他数据不显示?

非常感谢任何帮助,谢谢。

cell_process(Port, X, Y)->
    Host = "localhost",
    Data = [Host,Port,X,Y],
    {ok, Socket} = gen_tcp:connect(Host, 22, 
                                 [list, {packet, 0}]),
    ok = gen_tcp:send(Socket, Data),
    ok = gen_tcp:close(Socket).


server_process(ClientList)->
{ok, Listening_socket} = gen_tcp:listen(22, [list, {packet, 0}, 
                                        {active, false}]),
{ok, Socket} = gen_tcp:accept(Listening_socket),
    case gen_tcp:recv(Socket,0) of
        {ok,Message}->
            io:fwrite(Message);
        {error,Why}->io:fwrite(Why)
    end.

1 个答案:

答案 0 :(得分:2)

Data = [Host,Port,X,Y]是一个iolist,而不是列表 gen_tcp:send会将数据转换为[<<"localhost">>,<<22:8>>]

这是iolist的文档:

iodata() = iolist() | binary()
iolist()     maybe_improper_list(char() | binary() | iolist(), binary() | [])
maybe_improper_list()     maybe_improper_list(any(), any())
byte()     0..255
char()     0..16#10ffffmaybe_improper_list(T)     maybe_improper_list(T, any())