On the other hand , the thesis studies to develop the design software library for the hdcs with c + + programming language , including rcs module and communication tool of control system . moreover , based on the concept and properties of class and the merits of application programming interface ( api ) , the thesis puts forwards to use the abstract class to realize the elements of the design software library , such as the control module ( rcs module ) class and the communication classes ( neutral message language and communication management system ) , encapsulating the bottom details of the application and providing the top interface for user , as leads to the interface between modules be simple and makes user master and use them conveniently . what ' s more , the control system developed by the design software has good expansibility and reusability 另外，本文研究了用c + +程序设计语言进行递阶分布控制系统设计软件库的开发，包括rcs模块和系统通讯工具。基于类的概念与特征以及应用程序编程接口( api )的优点，提出用抽象类实现设计软件库元件，如控制模块( rcs模块)类和通讯类(中性消息语言nml ( neutralmessagelanguage ，简称nml )和通讯管理系统cms ( communicationmanagementsystem ，简称cms ) ) ，封装了控制系统应用程序底层的工作细节并提供了高层接口，从而使控制模块之间接口简单，便于用户掌握和使用，使开发出的控制系统具有很好的扩展性和重用性。
