如果窗体在响应WM_PAINT消息的时候要进行复杂的图形处理，由于窗体在频繁的用背景色来擦除原有图形，引起了很大的视觉反差。从而引起了闪烁。解决这一问题的有效方法就是双缓冲技术。-If the form is in response to WM_PAINT message when complex graphics, as in the form of frequent with the background color to erase the original graphics, caused a great visual contrast. Causing flicker. An effective way to solve this problem is to double buffering.