Each entity is a AutoCAD drawing has a unique identifier, this is a hexadecimal number, which is stored in a character string in DDVue. MicroStation DGN drawings also have these handles but are calledElement ID instead

通过vb.net对autocad的进行二次开发，实现对齿轮的参数设计。-By vb.net for autocad for secondary development, the realization of the gear design parameters.

AutoCAD .net开发人员手册中文版 低版本 适用于低版本autocad的开发使用