我在使用ctypes實現時遇到問題。我有2個C函數:回調函數的ctypes無效結果類型
antichain** decompose_antichain(antichain*, int, char (*)(void*, void*), void** (*)(void*));
counting_function** decompose_counting_function(counting_function*);
其中antichain和counting_function是兩個結構。 antichain可以看作一個集合,包含未知類型的元素(在這個例子中是counting_function)。 decompose_antichain函數作爲參數(除別的以外)用來分解antichain包含的元素( - >原型爲void **(*)(void *))的函數。
現在我想從Python中使用decompose_antichain。我用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))
最後一行產生錯誤:回調函數的結果類型無效。
我看不出問題來自哪裏。誰能幫我?謝謝