erlang 中的基本语法错误

Question

我试图找出以下代码段中的语法错误，但我实在看不出哪里出了问题。我确定它是基本的，但我只需要对这段代码有新的认识：

sloop(Listen)->
    {ok, Socket} = gen_tcp:accept(Listen),
    io:format("Someone connected"),
    master ! {add,Socket},
    spawn(fun() -> sloop(Listen) end),
    receive
        {tcp, Socket, Bin} ->
             case read(Bin) of
                    {join,Channel} -> 
                        tracker ! {self(),get,Socket},
                        receive 
                            void -> 
                                master ! {delete, Socket},
                                A = lists:dropwhile(fun(A) -> A /= Channel end, resgistered()),
                                case A of
                                    [H|T] -> H ! {add,Socket};
                                    _ -> register(Channel,spawn(fun() -> listenerSocket([]) end))
                                end,
                            Channel ! {add, Socket},
                            tracker ! {insert,Socket, Channel};
                            {ok, Value} -> 
                                Value ! {delete,Socket},
                                tracker ! {delete,Socket},
                                A = lists:dropwhile(fun(A) -> A /= Channel end, resgistered()),
                                case A of
                                    [H|T] -> H ! {add,Socket};
                                    _ -> register(Channel,spawn(fun() -> listenerSocket([]) end))
                                end,
                            Channel ! {add, Socket},
                            tracker ! {insert,Socket, Channel};
                    {message, Msg} ->   
                        tracker ! {self(),get,Socket},
                        receive 
                            {ok, Value} -> Value ! {broadcast, Msg}
                        end
             end;
        {tcp_closed, Socket} -> io:format("Someone disconnected")
    end.

“.”前的语法错误第 50 行。第 50 行是这段代码的最后一行

Answer 1

您缺少 end。您显示的最后一个 end 匹配 case read(Bin)...，因此您还需要一个用于封闭的 receive.

erlang 中的基本语法错误

Basic syntax error in erlang

syntax

erlang