1. a short pithy paper called Research on the scheme of spatial database building based on the integration of GIS and CAD has been finished.
2. I have studied AutoCAD ObjectARX Managed Wrapper Class for more than ONE week. Finally I found there are so less domestic materials, I can almost can find nothing valuable about ObjectARX. Of course Autodesk have the largest knowledge database for learning 4 ObjectARX. I decided to look some artical tomorrow in order to have a sound understanding fo .net and ObectARX.
3. Of course ObjectARX is not a excellent API for AutoCAD. It is only a simple wrapper for cpp, and there are so less documents about the architecture and usage, But I thnk it is one of the best example for the interop between .net and com. Almost all objects can have two type: managed or unmanaged.
4. I think there must be a lot of bugs in ObjectARX with my first sight.