双缓存，用于屏幕绘图，减少因频繁刷新图形而带来的闪烁感-Double buffer for screen drawing, refresh the graphics and reduce the frequency of light flashes caused

实现屏幕无产闪烁刷新，利用了MFC的虚拟内在技术-Of screen and flickering refresh, use the MFC' s virtual intrinsic

纯Win32SDK编写，采用二次缓冲技术防止屏幕闪烁，字体旋转技术显示钟表刻度，是参考学习之佳作。-Pure Win32SDK writing, using secondary buffer technology to prevent screen flicker, font rotation technique to display a clock tick, is a reference to learning works.