python 模仿 C/C++ 结构体

 import struct
 from ctypes import *

 class MyStruct(Structure):
     _fields_ = [
         ("v1", c_char),  # c_byte
         ("v2", c_char),  # c_byte
         ("v1_dire", c_char),  #  c_byte
         ("v2_dire", c_char)  #  c_byte
     ]

 mys = MyStruct()
 mys.v1 = 20
 print(type(mys.v1))
 mys.v2 = 30
 mys.v1_dire = 0
 mys.v2_dire = 0
 msg = struct.pack('cccc', mys.v1, mys.v2, mys.v1_dire, mys.v2_dire)  # BBBB
 print(msg)
 ss = struct.unpack('cccc', msg)  # BBBB