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

MFC实现简单的绘图板 本程序不实现双缓存绘图板 MFC学习与应用 vc6.0-MFC to achieve a simple drawing board this program does not implement double buffering drawing board MFC to learn and apply

一个漂亮的数字时钟，核心为位图窗口和双缓存绘图-A beautiful digital clock, core for the bitmap window and double-buffered graphics