bool wcharToString(IN wchar_t* wText, OUT string& str)
{
	//WideCharToMultiByte的运用 
	DWORD dwNum = WideCharToMultiByte(CP_OEMCP,NULL,wText,-1,NULL,0,NULL,FALSE);
	//psText为char*的临时数组，作为赋值给std::string的中间变量 
	char *psText;
	psText = new char[dwNum];
	// WideCharToMultiByte的再次运用 
	WideCharToMultiByte (CP_OEMCP,NULL,wText,-1,psText,dwNum,NULL,FALSE);
	//std::string赋值 
	str = psText; //大功告成
	//psText的清除 
	delete []psText;
	return true;
}