windows - How can I read a reg_qword in winreg in python 3.4? -

i inserted registry key, hkey_local_machine\software\test\test_qword of type reg_qword , value 20150509091344 (0x1253a7efba10).

i tried load using winreg following code in python 3.4:

import winreg key_dir = r"software\test" reg = winreg.openkey(winreg.hkey_local_machine, key_dir, 0,                      winreg.key_wow64_64key+winreg.key_all_access) test_dir = list(winreg.queryvalueex(reg, r'test_qword'))[0] print(test_dir) ans = "".join(map(lambda b: format(b, "02x"), test_dir)) print(ans) print(int(ans, 16)) 

and got following console output:

b'\x10\xba\xef\xa7s\x12\x00\x00' 10baefa753120000 1205539352207294464 

which not original value. how can retrieve original value winreg?

the code wrote interprets value big-endian-stored integer. however, reg_qword stored little-endian number.

there's easier way convert bytes value of 64-bit integer: using struct.unpack(). format '<q' read signed 64-bit little-endian integer:

>>> struct.unpack('<q', b'\x10\xba\xef\xa7s\x12\x00\x00') (20150509091344,) 

and if wanted read big-endian:

>>> struct.unpack('>q', b'\x10\xba\xef\xa7s\x12\x00\x00') (1205539352207294464,) 

you can see gives same incorrect value getting in code.

more information on format codes struct.unpack() , inverse, struct.pack(), in the docs struct module.