用autocad的二次开发工具ObjectARX，实现数据库反应器的编程，实现对象添加、删除、修改操作的捕获，并将捕获对像移动显示。-Using Objectarx to realise the programming of the reactor of the database of the autocad,which capturing the opration of appending 、erasing and modifing the object of the database.Mov