Python通过套接字发送和接收对象

Question

我在网上搜索了很多但是找不到通过套接字发送对象并按原样接收它的解决方案.我知道它需要我已经做过的酸洗.并且将其转换为字节并且另一方面接收.但是如何将这些字节转换为该类型的对象.

        process_time_data = (current_process_start_time, current_process_end_time)
        prepared_process_data = self.prepare_data_to_send(process_time_data)
        data_string = io.StringIO(prepared_process_data)
        data_string =  pack('>I' ,len(data_string)) + data_string
        self.send_to_server(data_string)            

这是将对象转换为客户端上的StringIO并发送到服务器的代码.在服务器端,我得到字节.现在我正在搜索要再次转换为StringIO的字节,以便我可以获取对象值.

在代码中,Object包装在StringIO中,并通过套接字发送.任何更好的方法将受到高度赞赏.

服务器端代码如下.

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
#server.setblocking(0)
server.bind(('127.0.0.1',50000))
server.listen(5)
inputs = [server]
outputs = []
message_queues = {}

while inputs:
    readable, writeable, exceptional = select.select(inputs, outputs, inputs)
    for s in readable:
        if s is server:
            connection, client_address = s.accept()
            print(client_address)
            connection.setblocking(0)
            inputs.append(connection)
            message_queues[connection] = queue.Queue()
            print('server started...')
        else:
            print('Getting data step 1')
            raw_msglen = s.recv(4)
            msglen = unpack('>I',raw_msglen)[0]
            final_data = b''
            while len(final_data) < msglen:
                data = s.recv(msglen - len(final_data))
                if data:
                    #print(data)
                    final_data += data
                    message_queues[s].put(data)
                    if s not in outputs:
                        outputs.append(s)
                    else:
                        if s in outputs:
                            outputs.remove(s)
                else:
                    break
            inputs.remove(connection)
#            s.close()
            del message_queues[s]

            process_data = ProcessData()
            process_screen = ProcessScreen()

            if final_data is not None:
                try:
                    deserialized_data = final_data.decode("utf-8")
                    print(deserialized_data)
                except (EOFError):
                    break
            else:
                print('final data is empty.')

            print(process_data.project_id)
            print(process_data.start_time)
            print(process_data.end_time)
            print(process_data.process_id)

两个辅助函数如下

def receive_all(server, message_length, message_queues, inputs, outputs):
    # Helper function to recv message_length bytes or return None if EOF is hit
    data = b''
    while len(data) < message_length:
        packet = server.recv(message_length - len(data))
        if not packet:
            return None
        data += packet
        message_queues[server].put(data)
        if server not in outputs:
            outputs.append(server)
        else:
            if server in outputs:
                outputs.remove(server)
    inputs.remove(server)
    del message_queues[server]
    return data


def receive_message(server, message_queues, inputs, outputs):
    # Read message length and unpack it into an integer
    raw_msglen = receive_all(server, 4, message_queues, inputs, outputs)
    if not raw_msglen:
        return None
    message_length = unpack('>I', raw_msglen)[0]

    return receive_all(server, message_length, message_queues, inputs, outputs)

其中两个模型类如下

class ProcessData:
    process_id = 0
    project_id = 0
    task_id = 0
    start_time = 0
    end_time = 0
    user_id = 0
    weekend_id = 0

# Model class to send image data to the server
class ProcessScreen:
    process_id = 0
    image_data = bytearray()

Answer 1

什么你要找的是这里pickle并loads和dumps操作.套接字基本上是字节流.让我们考虑你的情况.

class ProcessData:
    process_id = 0
    project_id = 0
    task_id = 0
    start_time = 0
    end_time = 0
    user_id = 0
    weekend_id = 0

需要被腌制成做数据串这个类的一个实例data_string = pickle.dumps(ProcessData())做和拆封data_variable = pickle.loads(data)哪里data是收到什么.

因此,让我们考虑客户端创建对象ProcessData并将其发送到服务器的情况.这是客户端的样子.这是一个最小的例子.

客户

import socket, pickle

class ProcessData:
    process_id = 0
    project_id = 0
    task_id = 0
    start_time = 0
    end_time = 0
    user_id = 0
    weekend_id = 0


HOST = 'localhost'
PORT = 50007
# Create a socket connection.
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))

# Create an instance of ProcessData() to send to server.
variable = ProcessData()
# Pickle the object and send it to the server
data_string = pickle.dumps(variable)
s.send(data_string)

s.close()
print 'Data Sent to Server'

现在,接收此数据的服务器如下所示

服务器

import socket, pickle

class ProcessData:
    process_id = 0
    project_id = 0
    task_id = 0
    start_time = 0
    end_time = 0
    user_id = 0
    weekend_id = 0


HOST = 'localhost'
PORT = 50007
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(1)
conn, addr = s.accept()
print 'Connected by', addr

data = conn.recv(4096)
data_variable = pickle.loads(data)
conn.close()
print data_variable
# Access the information by doing data_variable.process_id or data_variable.task_id etc..,
print 'Data received from client'

首先运行服务器bind在端口上创建一个,然后运行client通过套接字进行数据传输.你也可以看看这个答案