Python二进制数据结构Struct的具体使用

import struct
import binascii

values = (2, 'lyj'.encode('UTF-8'), 3.8)
s = struct.Struct('I 3s f')
packed_data = s.pack(*values)
print("原值：", values)
print("格式指示符：", s.format)
print("大小：", s.size, 'bytes')
print("打包值：", binascii.hexlify(packed_data))

import struct
import binascii

packed_data = binascii.unhexlify(b'020000006c796a0033337340')
s = struct.Struct('I 3s f')
unpacked_data = s.unpack(packed_data)
print("解包值：", unpacked_data)

import struct
import binascii

values = (2, 'lyj'.encode('UTF-8'), 3.8)
endianness = [
    ('@', '原生顺序'),
    ('=', '原生标准'),
    ('<', '小端'),
    ('>', '大端'),
    ('!', '网络顺序'),
]
for code, name in endianness:
    s = struct.Struct(code + ' I 3s f')
    packed_data = s.pack(*values)
    print("格式化字符串：", s.format, ' for ', name)
    print("大小：", s.size, 'bytes')
    print("打包：", binascii.hexlify(packed_data))
    print("解包：", s.unpack(packed_data))

import struct
import binascii
import ctypes
import array

values = (2, 'lyj'.encode('UTF-8'), 3.8)
s = struct.Struct('I 3s f')
print("原始值：", values)
b = ctypes.create_string_buffer(s.size)
print("打包之前(缓冲区的值)：", binascii.hexlify(b.raw))
s.pack_into(b, 0, *values)
print("打包之后(缓冲区的值)：", binascii.hexlify(b.raw))
print("解包：", s.unpack_from(b, 0))

a = array.array('b', b'\0' * s.size)
print("打包之前(缓冲区的值)：", binascii.hexlify(a))
s.pack_into(a, 0, *values)
print('打包之后(缓冲区的值)：', binascii.hexlify(a))
print("解包：", s.unpack_from(a, 0))