说明：  获取MAC地址最可靠的方法了,之前本人就在网上找了好多种方法,功能可以实现可是要封装成dll版本有不行了.这个可以.
(Get the MAC address of the most reliable way, and before I can find a good variety of online methods, functions can be encapsulated into a dll version, but there is not. This can be.)