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Windows中如何使用python直接调用C++ DLL

环境:Window 10,VS 2019, Python 2.7.12, 64bit

1,打开 VS 2019,新建C++ Windows 动态链接库工程 Example,加入下列文件,如果Python是64位的则在VS中 Solution platforms 选择 x64 编译成64位的 DLL;

Example.h

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#pragma once

#ifndef CPP_EXPORTS

#define CPP_EXPORTS

#endif

#ifdef CPP_EXPORTS

#define CPP_API _declspec(dllexport)

#else

#define CPP_API _declspec(dllimport)

#endif

#include <iostream>

using namespace std;

#ifdef __cplusplus

extern "C"

{

#endif

  CPP_API int __cdecl getInt();

  CPP_API const char* __cdecl getString();

  CPP_API void __cdecl setString(const char* str);

#ifdef __cplusplus

}

#endif

Example.cpp

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#include "pch.h"

#include "Example.h"

CPP_API int __cdecl getInt()

{

  return 5;

}

CPP_API const char* __cdecl getString()

{

  return "hello";

}

CPP_API void __cdecl setString(const char* str)

{

  cout << str << endl;

}

编译,得到 Example.dll

2, 打开 Command,cd 到 Example.dll 所在目录,输入 Python2,进入python环境

>>> from ctypes import *

>>> dll = CDLL("Example.dll")

>>> print dll.getInt()

5

>>> getStr = dll.getString

>>> getStr.restype = c_char_p

>>> pChar = getStr()

>>> print c_char_p(pChar).value

hello

>>> setStr = dll.setString

>>> setStr.argtypes = [c_char_p]

>>> pStr = create_string_buffer("hello")

>>> setStr(pStr)

hello

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