1. 首先VC++的DLL的导出函数定义成标准C的导出函数:
#ifdef LRDLLTEST_EXPORTS
#define LRDLLTEST_API __declspec(dllexport)
#else
#define LRDLLTEST_API __declspec(dllimport)
#endif
extern "C" LRDLLTEST_API int Sum(int a , int b);
extern "C" LRDLLTEST_API void GetString(char* pChar);
//a + b
LRDLLTEST_API int Sum(int a , int b)
{
return a + b;
}
//Get a string
LRDLLTEST_API void GetString(char* pChar)
{
strcpy(pChar, "Hello DLL");
}
#define LRDLLTEST_API __declspec(dllexport)
#else
#define LRDLLTEST_API __declspec(dllimport)
#endif
extern "C" LRDLLTEST_API int Sum(int a , int b);
extern "C" LRDLLTEST_API void GetString(char* pChar);
//a + b
LRDLLTEST_API int Sum(int a , int b)
{
return a + b;
}
//Get a string
LRDLLTEST_API void GetString(char* pChar)
{
strcpy(pChar, "Hello DLL");
}
2. Python中调用如下:
from ctypes import *
fileName="LRDllTest.dll"
func=cdll.LoadLibrary(fileName)
str = create_string_buffer(20)
n = func.Sum(2, 3)
func.GetString(str)
print n
print str.raw
fileName="LRDllTest.dll"
func=cdll.LoadLibrary(fileName)
str = create_string_buffer(20)
n = func.Sum(2, 3)
func.GetString(str)
print n
print str.raw
关于C语言中的一些参数类型详见:http://www.python.org/doc/2.5/lib/node454.html
3. 输出结果:
5
Hello DLL
Hello DLL
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