Com Technology And Print Component System Applied Research

In recent years, along with the development and application of the network, people pay more and more attention to the research of the distributed component system. Component technique is a new software engineer technique which following and extending the object-oriented technique. The system model that based on component is still object-oriented, but the objects in system are modules, which are designed according to the criterion. These good-defined modules survive together in system and effect on each other. You may construct a larger and more complex system according to this structure.Component object model (COM) is the binary system standard for windows object. It provide a uniform, object-oriented and extensible communicate protocol. This means that the executable code (. dll or .exe) could be executed by other objects. Even if these two objects are built by using not one type language, they can communicate with each other by using the COM.The author of this paper has designed and realized one application system that depends on the research of the criterion and framework of COM. In this project, author mainly designed and realized the COM object, so comprehensive researches on COM have been done and some achievements have been gotten.This paper summarizes these researches, which includes:First, the basic concept of Ihe component technique and the researches status about this are put forward, the brief introduction of popular component systems (COM, CORBA, Javabearis/EJB/JavaRMT) and the compare between their characteristics are provided. Then author explains the COM structure stressfully, including its characteristic, principle and system structure. Meanwhile, author studies how to realize the COM framework and compares several concretely realize methods in this paper.How to define the objects and the interfaces and realize the methods are provided following, and then author explains how to apply the COM/DCOM technique in an concrete system.At last, author studies and discovers the component technique by the way of researching and applying, tastes and summarizes the software develop methods and patterns which depend on COM, and gives some suggestion and advice on the software develop method about COM.