控制远程电脑截屏幕图像并回传的例子，包括客户端和服务端两个工程。这个例子中的重点示范是只把截取的图像中有变化的部分保存和传回，因此传送数据很小。-close to the screen images and biographies of examples, including client and server-side two projects. This case is the focus of the model only interception of the image changes