Python：使用ctypes访问DLL函数 - 通过function * name *访问失败 [英] Python: accessing DLL function using ctypes -- access by function *name* fails

问题描述

myPythonClient （以下）想要调用 ringBell 函数（从DLL使用 ctypes的）。但是，尝试通过其名称访问 ringBell 会导致 AttributeError 。为什么？

myPythonClient (below) wants to invoke a ringBell function (loaded from a DLL using ctypes). However, attempting to access ringBell via its name results in an AttributeError. Why?

RingBell.h 包含

namespace MyNamespace
    {
    class MyClass
        {
        public:
            static __declspec(dllexport) int ringBell ( void ) ;
        } ;
    }

RingBell.cpp 包含

#include <iostream>
#include "RingBell.h"
namespace MyNamespace
    {
    int __cdecl MyClass::ringBell ( void )
        {
        std::cout << "\a" ;
        return 0 ;
        }
    }

myPythonClient.py 包含

myPythonClient.py contains

from ctypes import *
cdll.RingBell[1]() # this invocation works fine
cdll.RingBell.ringBell() # however, this invocation errors out
# AttributeError: function 'ringBell' not found

推荐答案

也许是因为C ++名称被编译器损坏，而不是从DLL导出为 RingBell 。你是否检查过它出现在导出的名称中呢？

Perhaps because the C++ name is mangled by the compiler and not exported from the DLL as RingBell. Have you checked that it appears in the exported names exactly like that?

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