The Design Of LAN Instant Messaging Software On The Basis Of TCP/IP Protocol

Recently,the Computer technology is developing rapidly,various of instant messaging(IM)software emerge in an endless stream.for example,as we all know,YY voice、QQ、POPO andsuch so on.these software not only become our necessary communication-tools,but also canbe seen all over our life and working-place.in this project, we mainly discuss the enterpriseinstant messaging software (EIM0designing.EIM is actually an extension of the personally IM edition.it’s main function includes textinformation, file transfer, mobile phone messaging and so on.EIM can enforce theinter-communication and improve the enterprise’s working efficiency.and is convenient forinternal management and even reduce the communication cost.Firstly,we researched and studied various of current popular instant messagingsoftware.Fully considered of the enterprise communication needs,In order to adapt theenterprise’s interior use,we put forward C/S and P2P mixed communication architecture.thenfrom the system development principle, the system needs analysis, system design,we discussthe whole system.Using Visual C++6.0as the developing tools,and SQL Sever2000as thebackground database.and between client and sever,we take C/S model,between clients,wetake P2P models.At the same time, in order to ensure the safety of communication, we usedthe RSA and DES mixed encryption method for communication information encrypt.After comprehensive requirements analysis,we design the whole modules of the system intails.At the same time,we present the flow chart of some important modules and some keydesign core code.Finally,we tested the entire system, the test data indicates that the system has theadvantages of safety, reliability, scalability, high communication ability.