VC类存映射源码与说明，内存映射文件与虚拟内存有些类似，通过内存映射文件可以保留一个地址空间的区域，同时将物理存储器提交给此区域，内存文件映射的物理存储器来自一个已经存在于磁盘上的文件，而且在对该文件进行操作之前必须首先对文件进行映射。使用内存映射文件处理存储于磁盘上的文件时，将不必再对文件执行I/O操作，使得内存映射文件在处理大数据量的文件时能起到相当重要的作用。-VC class source code and descr iption of the memory map, memory-mapped files and virtual memory is somewhat similar to a region of the address space through memory-mapped files can be retained, while the physical memory in this area submitted to physical memory from a memory file mapping already exists on the diskon the file, before the file must first file mapping. Use memory-mapped file processing is stored in a file on disk, you will no longer need to run the file I/O operations, so that the memory-mapped file can play a very important role in dealing with the large amount of data file.