Python学习笔记之ctypes之结构解析和打包

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在Python使用有时要与C接口进行调用，则要使用较为低级一点的处理，例如结构如下所示：

class FLASH_INFO(Structure):
    _pack_ = 1
    _fields_ = [
        ('magic_num', c_int),
        ('total_size', c_short),
        ('sector_size', c_char),
        ('page_size', c_char),
        ('crc', c_short)
    ]


class GLOBAL_INFO(Structure):
    _pack_ = 1
    _fields_ = [
        ("flash_info", FLASH_INFO),
        ("main_data_addr", c_int),
        ("backup_data_addr", c_int),
        ("crc", c_short)
    ]

简洁的结构打包处理

# pack
g_Info = GLOBAL_INFO()
g_Info.backup_data_addr = 0x00076000
bin = string_at(addressof(g_Info),sizeof(g_Info))
print(hexlify(bin))

解包依然很简洁

# unpack
tmp = GLOBAL_INFO()
memmove(addressof(tmp), bin, sizeof(g_Info))
print(hex(tmp.backup_data_addr))

程序预览：

b'00000000000000000000000000000000006007000000'
0x76000