Application of Secondary Development of AutoCAD in Railway Signal Engineering Design

摘要

This paper studies a new approach to developing AutoCAD in MFC with ActiveX Automation technology. It successfully solved the problem that development visions of Object ARX are not correspondent. It analyzed the application of dispatch interface in IDispatch technology and VARIANT type data in depth. In addition, it gave out practical cases in which this approach is used and particularly discussed the method for using blocks and searching through diagram objects. This designing realized the automatic designing of engineering drawing and automatic extracting of information.