Define ctypes types to fix segfault

[noamraph]

I got a segfault when using hid from a thread. After a lot of debugging, it turned out to be because hid_open() returns a pointer, and because the return type wasn't defined, ctypes assumed the value is a 32-bit int, so the wrong value was passed to hid_read(). I defined all the types and now it works fine. Here are the definitions, it you like:

hidapi.hid_init.argtypes = []
hidapi.hid_init.restype = ct.c_int
hidapi.hid_exit.argtypes = []
hidapi.hid_exit.restype = ct.c_int
hidapi.hid_enumerate.argtypes = [ct.c_ushort, ct.c_ushort]
hidapi.hid_enumerate.restype = ct.POINTER(DeviceInfo)
hidapi.hid_free_enumeration.argtypes = [ct.POINTER(DeviceInfo)]
hidapi.hid_free_enumeration.restype = None
hidapi.hid_open.argtypes = [ct.c_ushort, ct.c_ushort, ct.c_wchar_p]
hidapi.hid_open.restype = ct.c_void_p
hidapi.hid_open_path.argtypes = [ct.c_char_p]
hidapi.hid_open_path.restype = ct.c_void_p
hidapi.hid_write.argtypes = [ct.c_void_p, ct.c_char_p, ct.c_size_t]
hidapi.hid_write.restype = ct.c_int
hidapi.hid_read_timeout.argtypes = [ct.c_void_p, ct.c_char_p, ct.c_size_t, ct.c_int]
hidapi.hid_read_timeout.restype = ct.c_int
hidapi.hid_read.argtypes = [ct.c_void_p, ct.c_char_p, ct.c_size_t]
hidapi.hid_read.restype = ct.c_int
hidapi.hid_set_nonblocking.argtypes = [ct.c_void_p, ct.c_int]
hidapi.hid_set_nonblocking.restype = ct.c_int
hidapi.hid_send_feature_report.argtypes = [ct.c_void_p, ct.c_char_p, ct.c_int]
hidapi.hid_send_feature_report.restype = ct.c_int
hidapi.hid_get_feature_report.argtypes = [ct.c_void_p, ct.c_char_p, ct.c_size_t]
hidapi.hid_get_feature_report.restype = ct.c_int
hidapi.hid_close.argtypes = ct.c_void_p
hidapi.hid_close.restype = None
hidapi.hid_get_manufacturer_string.argtypes = [ct.c_void_p, ct.c_wchar_p, ct.c_size_t]
hidapi.hid_get_manufacturer_string.restype = ct.c_int
hidapi.hid_get_product_string.argtypes = [ct.c_void_p, ct.c_wchar_p, ct.c_size_t]
hidapi.hid_get_product_string.restype = ct.c_int
hidapi.hid_get_serial_number_string.argtypes = [ct.c_void_p, ct.c_wchar_p, ct.c_size_t]
hidapi.hid_get_serial_number_string = ct.c_int
hidapi.hid_get_indexed_string.argtypes = [ct.c_void_p, ct.c_int, ct.c_wchar_p, ct.c_size_t]
hidapi.hid_get_indexed_string.restype = ct.c_int
hidapi.hid_error.argtypes = [ct.c_void_p]
hidapi.hid_error.restype = ct.c_wchar_p

[eblot]

Very nice, thanks. note: ctypes complains about one line:

hidapi.hid_close.argtypes = ct.c_void_p
# should be
hidapi.hid_close.argtypes = [ct.c_void_p]