How should I type-hint a foreign function defined with Python's ctypes?
Do I need to repeat the information provided in the restype and argtypes attributes? Or is there a method to enable mypy to somehow comprehend the attributes?
For example, given this function definiton:
# Original function definition:
libopus.opus_encode.restype = opus_int32
libopus.opus_encode.argtypes = [oe_p, opus_int16_p, c_int, c_uchar_p, opus_int32]
def opus_encode(st, pcm, frame_size, data, max_data_bytes):
return libopus.opus_encode(st, pcm, frame_size, data, max_data_bytes)
Is the best approach to manually duplicate the type information?
# Duplicated type specification:
libopus.opus_encode.restype = opus_int32
libopus.opus_encode.argtypes = [oe_p, opus_int16_p, c_int, c_uchar_p, opus_int32]
def opus_encode(st: oe_p,
pcm: opus_int16_p,
frame_size: c_int,
data: c_uchar_p,
max_data_bytes: opus_int32) -> opus_int32:
return libopus.opus_encode(st, pcm, frame_size, data, max_data_bytes)
Or is there a better approach?