Python 调用C++函数

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/wds2006sdo/article/details/53191353

传入两个int参数，返回int结果

代码

python 代码

# encoding=utf8

import ctypes

ll = ctypes.cdll.LoadLibrary
lib = ll("cpp_test/x64/Release/cpp_test.dll")

print lib.Add(1,3)

MyDLL.cpp

#include <iostream>
using namespace std; 
#include "MyDLL.h" 

int Add(int a,int b) 
{ 
    return a+b;  
} 

MyDLL.h 代码

#pragma once 

extern "C" __declspec(dllexport) int Add(int a,int b); 

运行结果

---

传入两个int参数的引用，返回int结果，并修改一个参数值

代码

python 代码

# encoding=utf8

import ctypes

ll = ctypes.cdll.LoadLibrary
lib = ll("cpp_test/x64/Release/cpp_test.dll")

a = ctypes.c_int(0)
b = ctypes.c_int(1)
print lib.Add(ctypes.byref(a),ctypes.byref(b))

c = a.value
print c

MyDLL.cpp

#include <iostream>
using namespace std; 
#include "MyDLL.h" 

int Add(int& a,int& b) 
{ 
    a += 1;
    return a+b;  
}

MyDLL.h 代码

#pragma once 

extern "C" __declspec(dllexport) int Add(int& a,int& b);

运行结果

---

传入数组，返回int结果

代码

python 代码

# encoding=utf8

import ctypes

ll = ctypes.cdll.LoadLibrary
lib = ll("cpp_test/x64/Release/cpp_test.dll")

python_array = (1,2,3,4,5)
length = len(python_array)

c_array = (ctypes.c_int * length)()
for i in xrange(length):
    c_array[i] = python_array[i]

print lib.Add(c_array,length)

MyDLL.cpp

#include <iostream>
using namespace std; 
#include "MyDLL.h" 

int Add(int* myarray,int length) 
{ 
    int result = 0;

    for(int i=0;i<length;i++)
        result += myarray[i];

    return result;  
} 

MyDLL.h 代码

#pragma once 

extern "C" __declspec(dllexport) int Add(int* myarray,int length);  

运行结果

---

参考资料

VS2012生成DLL
http://www.cnblogs.com/woshitianma/p/3681403.html
详细介绍ctypes
http://blog.csdn.net/jhonguy/article/details/7698350