在Windows操作系统中，当用户按下"PrintScreen"按钮后，Windows自动将当前屏幕的图像拷贝到系统剪贴板中，这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件，-In the Windows operating system, when the user presses the " PrintScreen"　button, Windows will automatically copy the current screen image to the system clipboard, then you can " brush"　This little program will save the contents of the clipboard into the image file ,