对于界面重绘的一个集合库，包括菜单，按扭，进度条，等等，类似于一个mfc的扩展，所以取名叫mfc_ex.dll,

MFC扩展界面库，直接用VC做界面，很难达到理想的效果，需要很大的工作量，用这个库，做界面很轻松-MFC extension of the interface library, a direct interface to do with VC, it is difficult to achieve the desired results, requires a lot of workload, use this library, so the interface is very easy