文件里面是一个工程包，工程包里面包含所有需要的文件。这个工程给我们展示如何创建dll文件。.cpp文件描述了如何创建一个dll文件，打开这个dll工程，就可以清楚的知道如何创建dll文件了-File which is an engineering package engineering package which contains all the required documents.This project to show us how to create a dll file. cpp file describes how to create a dll file, open the dll project, you can know exactly how to create a dll file