ObjectARX®, the AutoCAD® - Runtime Extension programming environment, includes C++ libraries that are the building blocks you can use to develop AutoCAD applications, extend AutoCAD classes and protocol, and create new commands that operate in the same manner as built-in AutoCAD commands. You can add new classes and export them for use by other programs. You can also extend the ObjectARX protocol by adding functions at runtime to existing AutoCAD classes.
ObjectDBX™ is the foundation for ObjectARX and for the RealDWG® SDK.
This section defines those terms, provides an overview of some important groups of ObjectARX and ObjectDBX classes, and gives information for getting started with ObjectARX. The ObjectARX Developer's Guide assumes that you are familiar with C++, object-oriented programming, and AutoCAD.