TakingRailway Line Arrangement Figure Drawing Assistant System with COM technology as an example, the technologies of COMunder the VC++6.0 and ATL were studied.

• 以使用COM技术开发铁路站场图绘制辅助系统的过程为例；研究了在VC++6.；0环境中使用ATL编写COM组件涉及的一些技术。