该源代码详细的描述如何利用内存映射机制来提高文件的访问读写速度，该方法尤其在读取大数据量的文件时候有显著的作用。我们经常遇到读取的数据文件达到100M以上时，用传统的方法进行读取往往会死机，程序效率很低，该方法为解决此类问题提供了一个很有意义的方法。-The source code for a detailed descr iption of how to use memory-mapped mechanism to improve file access to read and write speed, this method especially in large data files to read when a significant role. We often encounter the data file to 100M to read more, read the traditional methods tend to crash, the program inefficient to solve such problems the method provides a meaningful way.