我在使用ctypes时遇到了问题。我有两个C函数:
antichain** decompose_antichain(antichain*, int, char (*)(void*, void*), void** (*)(void*));
counting_function** decompose_counting_function(counting_function*);
其中,antichain和counting_function是两种结构。antichain可以看作一个集合,包含未知类型的元素(在此示例中为counting_function)。decompose_antichain函数的参数之一是用于分解antichain所包含元素的函数(->其原型为void **(*)(void *))。
现在我想从Python中使用decompose_antichain。我使用了ctypes:
lib = cdll.LoadLibrary("./mylib.dylib")
#CountingFunction, Antichain and other definitions skipped
DECOMPOSE_COUNTING_FUNCTION_FUNC = CFUNCTYPE(POINTER(c_void_p), POINTER(CountingFunction))
decompose_counting_function_c = lib.decompose_counting_function
decompose_counting_function_c.argtypes = [POINTER(CountingFunction)]
decompose_counting_function_c.restype = POINTER(c_void_p)
decompose_antichain_c = lib.decompose_antichain
decompose_antichain_c.argtypes = [POINTER(Antichain), c_int, DECOMPOSE_COUNTING_FUNCTION_FUNC, COMPARE_COUNTING_FUNCTIONS_FUNC]
decompose_antichain_c.restype = POINTER(POINTER(Antichain))
(...)
antichains_list = decompose_antichain_c(antichain, nb_components, COMPARE_COUNTING_FUNCTIONS_FUNC(compare_counting_functions_c), DECOMPOSE_COUNTING_FUNCTION_FUNC(decompose_counting_function_c))
最后一行产生了错误:回调函数的结果类型无效。
我看不出问题出在哪里。有人能帮我吗?谢谢。