Screen sharing and synchronous recording method based on IP network

Both the system information hooker and the API hooker are setup at same time and the screen image change area is traced. Based on the screen image change area, the changed screen image data are read fro the display card. The screen data are transmitted through two modes: unicast and multicast. The screen data are stored as the local file. The data received from IP network are decoded by using thereversed coding role. The decoded screen image is displayed on the pointed window. The invention makes general PC possible to run instructional software, meantime the screen image through network shared by other desktop can be synchronous recorded and stored as the local file. The invention possesses the features of good image quality, fast speed, easy of implementation and good portability.