Python調用C動態庫（返回結果爲結構體）

python調用C動態庫，結果返回結構體如何處理；

#!/bin/env python
# coding=UTF-8

from ctypes import *

class Hardware_API_Result(Structure):
    _fields_ = [ ("result", c_int),("json", c_char * 256)]

class GetCFunc:
    """
      結構體賦參數
     #test_struct = PyTestStruct()
     #test_struct.result = 1
     #test_struct.json = 'Hello, C'.encode()  # Python 2.x 則不需要寫 encode
    """

    def __init__(self):
        self.cdll = cdll.LoadLibrary('libhardwareInfo2.so')  
        return

    def getSysTime(self):
        """
         獲取系統時間
        :return:
        """
        #指定方法的返回類型
        self.cdll.get_system_time.restype = (Hardware_API_Result)
        p = self.cdll.get_system_time()

       #接收指針結構體
       # func.argtypes = [POINTER(PyTestStruct)]
        #print(type(p))
        print("json=",p.json)
        print(p.result)
       # print(type(p.json))
        if p.result==0:
            #返回的bytes類型，轉變爲str類型
            return str( p.json, encoding = "utf-8")
        else:
            return "404"



    
    def start4G(self):
        """啓動4g"""
        self.cdll.start_4g.restype = c_int
        p = self.cdll.start_4g()
        return p
    
    
    def getWiredNetInfo(self):
        """獲取有線配置信息"""
        self.cdll.get_wired_net_info.restype = (Hardware_API_Result)
        p = self.cdll.get_wired_net_info()
        if p.result == 0:
            # 返回的bytes類型，轉變爲str類型
            return str(p.json, encoding="utf-8")
        else:
            return "404"
    def ping(self,ip):
        """ping 輸入ip 是否同，返回值爲0，通的"""
        self.cdll.ping.restype = (Hardware_API_Result)
        p = self.cdll.ping(bytes(ip,encoding="utf-8"))
        return p.result
    
    def doReboot(self):
        """重啓"""
        self.cdll.do_reboot()