小小的抓屏程序的实现 刚开始写的程序有BUG，其根本原因是按像素处理速度太慢，还在处理过程中的时候，显存中的内容已经改变了，所以会出来意想不到的画面。 -minor procedures to achieve just started writing the procedures BUG, and the fundamental reason is based on pixel processing speed is too slow, but also the course of proces