Apua Python ctypes!

Miten alla olevaa functiota kutsutaan pythonista ctypesiä käyttäen?
GetNames(MYNAME* list, int max_names) ;

typedef struct _name_list
{
char name[10] ;
} MYNAME ;

MYNAME names[46];
GetNames(names, 46);

Alla oma python yritys, en ymmärrä mikä vialla?

import ctypes
class MYNAME(ctypes.Structure):
_fields_ = [
("name", (ctypes.c_char*10))]

names = (MYNAME * 46)()

python_get_names.argtypes = [ctypes.POINTER(MYNAME*46), ctypes.c_int]
python_get_names(names, 46)

Tule virhe:
ValueError: Procedure called with not enough arguments (20 bytes missing) or wrong calling convention