Using FaceID

[arandomperson]

I'm trying to implement Face ID in a script, but following the example Touch ID scripts it just results in a crash, with faulthandler just saying Aborted

This is what i'm using,

from objc_util import *

context = ObjCClass('LAContext').alloc().init()
policy = 1
reason = "FaceID Testing"

def _handler(_cmd, success, error):
	autherr = ObjCInstance(error).localizedDescription()
	print(autherr)
	if success:
		print('authenicated')

handler = ObjCBlock(_handler,restype = None, argtypes = [c_void_p, c_void_p, c_void_p])
context.evaluatePolicy_localizedReason_reply_(policy, reason, handler)

Using the "canEvaluatePolicy:error:" function, it returns true, so i'm assuming that Face ID works.
Also setting policy to 2, defaults to passcode authentication.
Of course it can as simple as @omz not adding "NSFaceIDUsageDescription" to pythonista's Info.plist

Thanks for any help!

[JonB]

Well, your objc_block signature is wrong -- success (second argtypes) is a BOOL, not a c_void_p. BOOL in objc is a typedef for a signed char, or c_byte in ctypes. Note it is NOT c_bool.

[arandomperson]

@JonB oops my mistake, though it still crashes unfortunately.
Thanks for the reply!

[JonB]

does it still crash with the same seg fault?

[JonB]

try using None for the block, just to see if it crashes.

[arandomperson]

@JonB yeah, changing c_void_p to c_byte still results in a crash with the same fault log, and setting the handler to None also results in a crash with the same fault log.