The Research And Implementation Of Instant Messenger Whiteboard-based

Instant Messenger(IM) is a network application software which emerged in late PC time and was based on Internet network. IM can support users to transfer text, video, audio informations and track Internet users' online status.In Nov. 1996, Miralilis Company develops the first Instant Messenger named ICQ. And it created the concept of Instant Messenger first time. More and more Instant Messengers are developed. Up to now, there are ICQ, MSN Messenger, QQ, Sohu I Seek You, RealLink and so on, which are support to transfer text, file, audio or video information. With the improvement of technologies and demands, the application area of Instant Messenger is from person to group, as tele-meeting, tele-earning etc.At present, there are some questions about Instant Messenger in terms of supporting to draw instantly graphs for communicating with others. Instant Messengers only support the communications based on words, files, audio and video. There is no environment to draw graphs in local computer in Instant Messengers. And when transferring pictures, the encode picture data are too large.Based on the analysis on the status and tide of Instant Messengers, aim at above questions, this dissertation brings forward some solutions, that is to add whiteboard to the Instant Messenger system in order to implement instant communication graph-based. Firstly, develop the tools in instant messengers' clients to solve the tools of drawing graphs. Secondly, carry out strategy of transferring graph characters information to collect the key character informations and transfer them to tele-client. Finally, revert the graphs according to the received character informations. So that the strategy can reduce the transferring graphs quality and the network load.The thesis mainly analyses solutions of basic graphs designing and implementations. But graphs are complicated and there are all kinds of graphs, different solutions. So by the strategy of transferring graph characters information, we need to research on solutions of drawing, coding and transferring instangly graphs.