Research And Implementation Of Remote Desktop Control Protocol Based On Web Browser

Today's network technology and mobile devices are developing rapidly,along with the increasing voice of energy-saving emission reduction,the major cloud computing service providers have launched their own desktop cloud products.Users through the desktop cloud client can use the application or desktop window on demand,greatly improving the flexibility and reduce the resource consumption.With the desktop cloud products continue to mature,as the desktop cloud indispensable remote desktop control software in more and more attention is also facing many challenges: how to meet the needs of users mobile office;how to reduce the network delay While improving the visual effects experience;how to support the user cross-platform use.RFB protocol and RDP protocol,as a popular remote desktop control protocol,have been applied to many desktop cloud products.VNC is a remote desktop control software designed based on RFB protocol.The design ideas of VNC is simple and clear,powerful,because of its low processor resource consumption,low network bandwidth occupancy and cross-operating system platform and other advantages and much favored by users.Although the RFB protocol in the remote desktop control is very good,but because of their own design considerations,video image optimization and peripheral equipment support is not friendly,and can not meet today's users for high-definition image transmission needs.RDP protocol relative to the RFB protocol to improve the function of many,not only to support graphics acceleration and device redirection but also are optimized for video and audio playback.Although the RDP protocol function has been very complete,to meet the needs of most users use,but its restrictions on the server operating system still affects the user's cross-platform use.In view of the above problems,this thesis first analyzes the implementation details of RFB protocol and RDP protocol,and puts forward the improvement scheme of the two protocols which are suitable for the WEB browser environment:(1)Using mode of switching,to achieve video playback acceleration.In video playback mode,use efficient H.265 encoding.(2)Use USB device driver redirection to provide support for USB peripheral redirection.(3)Use WebSocket as a network transport protocol to provide support for web browser access to virtual desktops.Secondly,based on the improvement scheme,the remote desktop control protocol(WRD)based on WEB browser is designed and defined,and the protocol level and message structure are introduced in detail.Finally,based on the definition of WRD protocol design and implementation of WEB browser environment for the remote desktop control system,and the system function and performance of the test and comparative analysis.The final conclusion: WRD agreement at the expense of part of the performance of the premise,effectively reducing the bandwidth occupancy and improve the image fluency,and the WEB browser support is good,to meet the users needs that through the WEB browser to access the virtual desktop environment.