Python的ctypes回調函數可以返回一個python類的實例嗎？

Question

from ctypes import * 
class CTest(Structure): 
    pass 

def get_test(id): 
    c = CTest() 
    return c 

func_type = CFUNCTYPE(CTest, c_int) 
test_callback = func_type(get_test) 

當我運行該腳本，我得到：

Traceback (most recent call last): 
    File "E:\test\ctypes_test.py", line 11, in <module> 
    test_callback = func_type(get_test) 
TypeError: invalid result type for callback function 

什麼是錯的腳本？

Answer 1

使用ctypes.pyobject：

import ctypes 
#from ctypes import * 
class CTest(ctypes.Structure): 
    _fields_ = [] 
    a = 10 

    def __init__(self): 
     ctypes.Structure.__init__(self) 

def get_test(id): 
    return CTest() 


func_type = ctypes.CFUNCTYPE(ctypes.py_object , ctypes.c_int) 
test_callback = func_type(get_test) 

print test_callback(1).a 

>> 10