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开放埃尔兰港:无答复
原标题:Open a Python port from Erlang: no reply messages

根据《检察官办公室行动手册》第12章和《塞萨尔尼》一书,我撰写了《埃尔兰法典》:

Erlang:

p(Param) ->

    ?DBG("Starting~n", []),

    Cmd = "python test.py",

    Port = open_port({spawn,Cmd}, [stream,{line, 1024},  exit_status]),
    ?DBG("Opened the port: ~w~n", [Port]),

    Payload = term_to_binary(list_to_binary(integer_to_list(Param))),
    erlang:port_command(Port, Payload),

    ?DBG("Sent command to port: ~w~n", [Payload]),
    ?DBG("Ready to receive results for command: ~w~n", [Payload]),

    receive
        {Port, {data, Data}} ->
            ?DBG("Received data: ~w~n", [Data]),
            {result, Text} = binary_to_term(Data),
            Blah = binary_to_list(Text),
            io:format("~p~n", [Blah]);
        Other ->
            io:format("Unexpected data: ~p~n", [Other])

    end.

粉碎

import sys
def main():
    while True:
        line = sys.stdin.readline().strip()
        if line == "stop-good":
                return 0
        elif line == "stop-bad":
                return 1
        sys.stdout.write("Python got ")
        sys.stdout.write(line)
        sys.stdout.write("
")
        sys.stdout.flush()
if __name__ == "__main__":
 sys.exit(main())

《埃兰法》在重新适用条款时暂停适用,它从来就得不到任何信息。

我也从一个常规的六氯环己烷中检查了沙捞越,它印刷了每个用户的投入(1-Python got 1)。

这里的错误在哪里? 我的埃兰法为什么回头?

最佳回答

有两个要点:

  • make sure that Python does not buffer your output, try running python -u in open_port
  • using term_to_binary/1 and binary_to_term/1 won t work, since they assume that Python is able to encode/decode Erlang External Term Format, which does not seem to be the case. If you want to go this route, check out ErlPort
问题回答

Does your Param contain the command limiter for Python? (in this case I assume newline, " "). Also, list_to_binary/1 and then a term_to_binary/1 feels kinda wrong. term_to_binary/1 directly (including the newline) should be sufficient.





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