python 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