Windows系统程序设计之DLL基础，使用 DLL 有很多好处，比如促进代码的模块化、代码重用、内存的有效使用和减少所占用的磁盘空间等。-DLL-based Windows system programming, using the DLL has many advantages, such as the promotion code modularity and code reuse and efficient memory usage, and to reduce the disk space occupied.