可以发送字符串，但不能发送其他字符串

Question

我正在尝试让服务器在接收GETALL作为输入时返回这个work，但是除了直接给定的字符串之外的任何东西都不起作用。我怀疑是编码，但它似乎不是破解它的那个。有什么建议吗？

最初的编码是ASCII和UTF-8的变体，但为了简单起见，我将其全部改为UTF-8。

import logging
import socket

import constCS
from context import lab_logging

lab_logging.setup(stream_level=logging.INFO)  # init loging channels for the lab


class Server:
    _logger = logging.getLogger("vs2lab.lab1.clientserver.Server")
    _serving = True

    thisdict = {
        "Ivan" : "0123",
        "Kiro" : "4567"
    }

    def GETALL():
        return thisdict

    def __init__(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.bind((constCS.HOST, constCS.PORT))
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)  # prevents errors due to "addresses in use"
        self.sock.settimeout(3)  # time out in order not to block forever
        self._logger.info("Server bound to socket " + str(self.sock))

    def serve(self):
        self.sock.listen(1)
        while self._serving:  # as long as _serving (checked after connections or socket timeouts)
            try:
                (connection, address) = self.sock.accept()  # returns new socket and address of client
                while True:  # forever
                    data = connection.recv(1024)  # receive data from client
                    if not data:
                        break  # stop if client stopped
                    if data == "GETALL":
                        connection.send(str(thisdict) + "".encode('utf-8'))  # return sent data plus an ""
                connection.close()  # close the connection
            except socket.timeout:
                pass  # ignore timeouts
        self.sock.close()
        self._logger.info("Server down.")


class Client:
    logger = logging.getLogger("vs2lab.a1_layers.clientserver.Client")

    def __init__(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.connect((constCS.HOST, constCS.PORT))
        self.logger.info("Client connected to socket " + str(self.sock))

    def call(self, msg_in="GETALL"):
        self.sock.send(msg_in.encode('utf-8'))  # send encoded string as data
        data = self.sock.recv(1024)  # receive the response
        msg_out = data.decode('utf-8')
        print(msg_out)  # print the result
        self.sock.close()  # close the connection
        self.logger.info("Client down.")
        return msg_out

    def close(self):
        self.sock.close()

Answer 1

你的问题在这里(很明显)：

connection.send(str(thisdict) + "".encode('utf-8'))

这是类型的一个例外：

TypeError: can only concatenate str (not "bytes") to str

您看不到这个异常，因为您正在捕获它并执行pass。

您需要的是将""连接起来，然后进行编码，如下所示：

connection.send((str(thisdict) + "").encode('utf-8'))