python中调用C++写的动态库

一、环境:Windows XP + Python3.2

1. dll对应的源文件(m.cpp):

#include <stdio.h>



extern "C"

{

    _declspec(dllexport) int add(int a, int b)

    {

        return a+b;

    }



    _declspec(dllexport) void print_sum(unsigned long ulNum)

    {

        while(ulNum != 0)

        {

            printf("The ulNum is : %u\n", ulNum--);

        }

    }

}

2. python源程序:

# coding=GBK



from ctypes import *

import time



if __name__ == '__main__':

    time_begin = time.clock()



    #dll = CDLL("d.dll")            # 加载dll方式一

    dll = cdll.LoadLibrary("d.dll")    # 加载dll方式二

    print(dll.add(2, 6))            # 调用dll中add方法

    dll.print_sum(100)                # 调用dll中print_sum方法



    t = time.clock() - time_begin    # 计算时间差

    print("Use time: %f" %t)        # 打印耗时时间

运行输出:

E:\Program\Python>del

8

The ulNum is : 100

The ulNum is : 99

The ulNum is : 98

...........

The ulNum is : 2

The ulNum is : 1

Use time: 0.003853



E:\Program\Python>

二、环境:Fedora12 + Python2.6

1. 动态库源文件(a.cpp):

#include <stdio.h>



extern "C"

{

    int add(int a, int b)

    {

        return a+b;

    }



    void print_sum(unsigned long ulNum)

    {

        while(ulNum != 0)

        {

            printf("The ulNum is : %u\n", ulNum--);

        }

    }

}

编译指令:g++ -shared -o liba.so a.cpp

 2. python源程序(del.py):

#!/usr/bin/env python

# coding=UTF-8



from ctypes import *

import time



if __name__ == '__main__':

    time_begin = time.clock()



    dll = CDLL("./liba.so")                    # 加载dll方式一(默认在系统lib库路径下查找.so文件)

    #dll = cdll.LoadLibrary("./liba.so")    # 加载dll方式二

    print(dll.add(2, 6))                    # 调用dll中add方法

    dll.print_sum(10000)                    # 调用dll中print_sum方法



    t = time.clock() - time_begin            # 计算时间差

    print("\nUse time: %s" %t)                # 打印耗时时间

注意:Linux上用Python加载动态库时默认是从系统lib路径下是查找库文件的。所以在python中加载当前路径下的动态库的话,路径要写“./liba.so",否则会提示动态库文件找不到!

 

http://blog.csdn.net/joeblackzqq/article/details/7405992

 

http://blog.csdn.net/magictong/article/details/3075478(更详细的说明)

http://blog.csdn.net/oracleot/article/details/3851512(使用SWIG实现C++导出python接口的配置

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