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 != )
{
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

The ulNum is :
The ulNum is :
The ulNum is :
...........
The ulNum is :
The ulNum is :
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 != )
{
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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