vc 实现双缓冲绘图，先创建兼容位图，再创建兼容dc-请键入文字或网站地址，或者上传文档。 取消 Vc shíxiàn shuāng huǎnchōng huìtú. Xiān chuàngjiàn jiānróng wèi tú, zài chuàngjiàn jiānróng DC.vc achieve double-buffered drawing. Create compatible bitmap in creating a compatible DC.