我想通过python套接字发送字典
我尝试对发送数据进行编码,然后在接收点进行编码
但问题在于接收到的数据无法转换,无法转换成字典
这是我的密码:
类client.py
:
HEADER_LENGTH = 512
IP = "127.0.0.1"
PORT = 963
my_username = input("Username: ")
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect((IP, PORT))
client_socket.setblocking(False)
username = my_username.encode('utf-8')
username_header = f"{len(username):<{HEADER_LENGTH}}".encode('utf-8')
client_socket.send(username_header + username)
while True:
message = input(f"{my_username} > ")
if message:
message = message.encode('utf-8')
message_header = f"{len(message)}:<{HEADER_LENGTH}".encode('utf-8')
# {'header': {message_header}, 'data': {message}}
send_dict = {} # 'header': message_header, 'data': message
send_dict["header"] = str(message_header)
send_dict["data"] = str(message)
client_socket.send(json.dumps(send_dict).encode('utf-8')) # message_header + message
try:
while True:
# Receive ...
username_header = client_socket.recv(HEADER_LENGTH)
if not len(username_header):
print("Connection closed by the server")
sys.exit()
username_length = int(username_header.decode('utf-8').strip())
username = client_socket.recv(username_length).decode(('utf-8'))
message_header = client_socket.recv(HEADER_LENGTH)
message_length = int(message_header.decode('utf-8').strip())
message = client_socket.recv(message_length).decode(('utf-8'))
print(f"{username} > {message}")
except IOError as e:
if e.errno != errno.EAGAIN and e.errno != errno.EWOULDBLOCK:
print('Reading error', str(e))
sys.exit()
continue
except Exception as e:
print('General error', str(e))
sys.exit()
类server.py
:
HEADER_LENGTH = 512
IP = "127.0.0.1"
PORT = 963
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind((IP, PORT))
server_socket.listen()
socket_list = [server_socket]
clients = {}
def receive_message(client_socket):
# print(f"client socket: {client_socket}")
# try:
message_header = client_socket.recv(HEADER_LENGTH)
if not len(message_header):
print("return from receive message /condition/")
return False
print(f"message header: {type(message_header)}")
print(f"message header: {message_header}")
print(f"message header decode : {type(message_header.decode('utf-8').strip())}")
message_header_dict = message_header.decode('utf-8').strip()
# print(f"message header replaced : {message_header}")
print(f"message header replaced : {type(message_header_dict)}")
print(f"message header replaced : {message_header_dict}")
# print("message header header : " + message_header_dict['header'].decode('utf-8').strip())
json_message_header = json.loads(message_header_dict)
print(f"message header replaced : {json_message_header}")
print(f"message header replaced : {json_message_header['data']}") # Error line
message_length = int(message_header.decode("utf-8").strip())
return {"header": message_header, "data": client_socket.recv(message_length)}
# except:
# print("return from receive message /except/")
# return False
while True:
read_sockets, _, exception_sockets = select.select(socket_list, [], socket_list)
for notified_socket in read_sockets:
if notified_socket == server_socket:
client_socket, client_address = server_socket.accept()
user = receive_message(client_socket)
if user == False:
continue
socket_list.append(client_socket)
clients[client_socket] = user
print(
f"Accept new connection from {client_address[0]}:{client_address[1]} username:{user['data'].decode('utf-8')}")
else:
message = receive_message(notified_socket)
if message == False:
print(f"close connection from: {clients[notified_socket]['data'].decode('utf-8')}")
socket_list.remove(notified_socket)
del clients[notified_socket]
continue
user = clients[notified_socket]
print(f"Received message from: {user['data'].decode('utf-8')}: {message['data'].decode('utf-8')}")
for client_socket in clients:
if client_socket != notified_socket:
client_socket.send(user['header'] + user['data'] + message['header'] + message['data'])
for notified_socket in exception_sockets:
socket_list.remove(notified_socket)
del clients[notified_socket]
您可以使用pickle或其更快的版本cPickle来序列化数据和反序列化数据
下面是使用pickle发送和接收数据以进行序列化的示例函数:
您可以在https://github.com/vijendra1125/Python-Socket-Programming.git找到示例程序
您的客户端发送JSON。然后,服务器读取整个JSON消息并尝试将其解释为整数。轰
传输完整消息基本上有3个选项:发送字节,并假设您从一次读取中接收到整个消息,而不是更多(最不可靠);使用分隔符(,例如,CRLF),并确保它不会出现在消息中(受限数据流);或者发送一个字节计数,后跟消息字节(长度+数据,最可靠)。看起来您混合了第一种和第三种方法,这基本上不起作用
要使用length+数据将dict序列化为JSON传输,首先JSON对dict进行编码,然后UTF8对结果字符串进行编码以获得消息字节。从这一点开始,直到服务器反序列化消息,代码都在使用字节
要发送长度+数据,
struct
模块是您的朋友。定义打包/解包说明符(基本上是选定的大小整数加上bytestring)。例如,"!Hs"
将支持高达64K的消息bytestring在客户端
struct.pack
创建二进制消息(<;长度头>;<;消息字节>;)李>socket.sendall
发送二进制消息(发送消息可能需要多次send
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会为您处理这些调用)李>在服务器中
socket.recv
只接收头字节(例如、4或8字节)李>struct.unpack
解压字节计数李>socket.recv
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