说明：  这是一本关于Windows下内存映射文件相关内容的书籍， 通过它可以操作文件，它的速度是I/O操作的20倍，及其适合大文件的操作
(This is a book about Windows memory mapping document of relevant books, through which it can file, its speed is I/O operation20 times, and is suitable for large files )