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#!/usr/bin/env python3

# -*- conding: utf-8 -*-

'练习内建模块之struct'

__author__ = 'sergiojune'

import struct,base64

# 这个模块是将bytes与其他二进制数据互相转换

# 将任意数据类型转为bytes

i = 10249999

b = struct.pack('>I', i) # 第一个参数为处理指令

print(b)

s = 123.456

b = struct.pack('f', s)

print(b)

# 将bytes转为其他任意类型

s = struct.unpack('f', b)

print(s)

s = b'\x42\x4d\x38\x8c\x0a\x00\x00\x00\x00\x00\x36\x00\x00\x00\x28\x00\x00\x00\x80\x02\x00\x00\x68\x01\x00\x00\x01\x00\x18\x00'

un = struct.unpack('<cciiiiiihh', s)

print(un)

# 作业：编写一个bmpinfo.py，可以检查任意文件是否是位图文件，如果是，打印出图片大小和颜色数

bmp_data = base64.b64decode('Qk1oAgAAAAAAADYAAAAoAAAAHAAAAAoAAAABABAAAAAAADICAAASCwAAEgsAAAAAAAAAAAAA/3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9/AHwAfAB8AHwAfAB8AHwAfP9//3//fwB8AHwAfAB8/3//f/9/AHwAfAB8AHz/f/9//3//f/9//38AfAB8AHwAfAB8AHwAfAB8AHz/f/9//38AfAB8/3//f/9//3//fwB8AHz/f/9//3//f/9//3//f/9/AHwAfP9//3//f/9/AHwAfP9//3//fwB8AHz/f/9//3//f/9/AHwAfP9//3//f/9//3//f/9//38AfAB8AHwAfAB8AHwAfP9//3//f/9/AHwAfP9//3//f/9//38AfAB8/3//f/9//3//f/9//3//fwB8AHwAfAB8AHwAfAB8/3//f/9//38AfAB8/3//f/9//3//fwB8AHz/f/9//3//f/9//3//f/9/AHwAfP9//3//f/9/AHwAfP9//3//fwB8AHz/f/9/AHz/f/9/AHwAfP9//38AfP9//3//f/9/AHwAfAB8AHwAfAB8AHwAfAB8/3//f/9/AHwAfP9//38AfAB8AHwAfAB8AHwAfAB8/3//f/9//38AfAB8AHwAfAB8AHwAfAB8/3//f/9/AHwAfAB8AHz/fwB8AHwAfAB8AHwAfAB8AHz/f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//3//f/9//38AAA==')

# 判断位图文件是根据他的前30个字节来判断的

def bmp_info(data):

un = struct.unpack('<cciiiiiihh', data[:30])

if un:

if un[0] == b'B' and un[1] == b'M':

return {'width': un[6],

'height': un[7],

'color': un[9]}

return 'not bmp'

b = bmp_info(bmp_data)

print(b)