我尝试在python客户端和服务器端之间发送和接收C结构数据，客户端和服务器端在连接和交换数据方面都很顺利，客户端向服务器端发送一个ctype结构，服务器端再将其发送回来，问题是我不知道如何解释客户端接收到的消息，并按照结构格式提取数据。我的最后一个想法是让python服务器和C客户机相互对话，并在预定义的结构中交换数据。
下面是我用Python编写的客户端和服务器代码：

客户代码

import socket
import sys
import time

from ctypes import *

class payload_t(Structure):
    _fields_ = [("ms", c_ulong),
                ("counter", c_ulong),
                ("DHT_temperature", c_float),
                ("DHT_humidity", c_float),
                ("DS_temperature", c_float),
                ("temperature_setpoint", c_float),
                ("time_setpoint", c_float)]

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Connect the socket to the port where the server is listening
server_address = ('localhost', 10000)
print >>sys.stderr, 'connecting to %s port %s' % server_address
sock.connect(server_address)

try:
    for i in range(0,10):
        # Send data
        payload=payload_t(i*1000,i+1,25.2,45.7,25.8,33.22,3600.0)
        message = payload
        # 'This is the message.  It will be repeated.'
        print 'length of message %d' % sizeof(message)
        print 'sending "', message.ms, message.counter, message.DHT_temperature, message.DHT_humidity, message.DS_temperature, message.temperature_setpoint, message.time_setpoint, '"'
        sock.sendall(message)
        # time.sleep(0.1)
        # Look for the response
        amount_received = 0
        amount_expected = sizeof(message)

        while amount_received < amount_expected:
            datap = sock.recv(sizeof(message))
            amount_received += len(datap)
        print >>sys.stderr, 'received "%s"' % datap
        print type(datap)
        payload=payload_t()
        datap.readinto(payload)
        data=datap.readinto(payload_t)
        data=struct.unpack(payload_t,datap)
            print 'Received "', data.ms, data.counter, data.DHT_temperature, data.DHT_humidity, data.DS_temperature, data.temperature_setpoint, data.time_setpoint, '"'

finally:
    print >>sys.stderr, 'closing socket'
    sock.close()

服务器代码

import socket
import sys
from ctypes import *

class payload_t(Structure):
    _fields_ = [("ms", c_ulong),
                ("counter", c_ulong),
                ("DHT_temperature", c_float),
                ("DHT_humidity", c_float),
                ("DS_temperature", c_float),
                ("temperature_setpoint", c_float),
                ("time_setpoint", c_float)]

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Bind the socket to the port
server_address = ('localhost', 10000)
print >>sys.stderr, 'starting up on %s port %s' % server_address
sock.bind(server_address)

# Listen for incoming connections
sock.listen(1)
payload=payload_t(0,0,0.0,0.0,0.0,0.0,0.0)
while True:
    # Wait for a connection
    print >>sys.stderr, 'waiting for a connection'
    connection, client_address = sock.accept()

    try:
        print >>sys.stderr, 'connection from', client_address

        # Receive the data in small chunks and retransmit it
        while True:
            data = connection.recv(sizeof(payload))
            print >>sys.stderr, 'received "%s"' % data
            if data:
                print >>sys.stderr, 'sending data back to the client'
                connection.sendall(data)
            else:
                print >>sys.stderr, 'no more data from', client_address
                break

    finally:
        # Clean up the connection
        connection.close()