创建或打开一个文件内核对象,该对象用于标识磁盘上你想用作内存映射文件的文件；

创建一个文件映射内核对象,告诉系统该文件的大小和你打算如何访问该文件；

让系统将文件映射对象的全部或一部分映射到你的进程地址空间中；

-Create or open a file kernel object, the object is used to identify the disk you want to be used as memory-mapped file　to create a file-mapping kernel object, tell the system that the file size and how you intend to access the file　allow the system the file map all or part of the object is mapped to your process address space