如何用boost.python编写python扩展?

Dll扩展部分(文件名与模块名一致,将生成的DLL扩展名改为.pyd):

#include "stdafx.h"

#include <boost/python.hpp>

#define EXPORT_SYMBOL_TO_PYTHON(x) boost::python::def(#x, x)

void MsgBox(PyObject* pObj)
{
   MessageBoxA(NULL, ((PyStringObject*)pObj)->ob_sval, "message", MB_OK );
}

BOOST_PYTHON_MODULE(DllForPython)
{
    EXPORT_SYMBOL_TO_PYTHON(MsgBox);
}
Python脚本调用部分(将DLL扩展目录加入到sys.path):
# -*- coding: gbk -*-

import sys
sys.path.append('./Debug')
import DllForPython
DllForPython.MsgBox("Everything is OK")