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AutoCAD ObjectARX SDK Developer Center

Frequently Asked Questions

  • What versions of ObjectARX are available?
    You can download ObjectARX® software for the latest three releases of AutoCAD® and AutoCAD® for Mac® software products.

  • How do I get the ObjectARX software development kit (SDK)?
    The complete ObjectARX SDK and license agreement are available for download at no charge.

  • What is the difference between RealDWG and ObjectARX for AutoCAD?
    The RealDWG™ application is a subset of ObjectARX and contains the APIs for reading and writing DWG™ and DXF™ files. RealDWG does not contain support for viewing and accessing the AutoCAD user interface.ObjectARX applications always require AutoCAD as their host application. RealDWG does not require the presence of AutoCAD software. RealDWG can be used to create independent host applications. ObjectARX cannot.

  • What documentation is available for developing applications in ObjectARX?
    The following publications are included with the ObjectARX SDK:
    • Managed Class Reference
    • ObjectARX Developer’s Guide
    • ObjectARX Reference
    • Application Interoperability Guidelines
    • ObjectARX 64-bit Migration Guide
    • Links to other valuable developer reference materials are listed at www.autodesk.com/developautocad.

  • Is developer support or training available for ObjectARX?
    Yes. Support is available through the Autodesk public forums (http://forums.autodesk.com/t5/Autodesk-ObjectARX/bd-p/34) or through membership of the Autodesk Developer Network (www.autodesk.com/joinadn). ObjectARX training material is available for download from www.autodesk.com/developautocad.

  • Do I have to rebuild my older AutoCAD applications to work on the latest version of AutoCAD?
    It depends on the version of AutoCAD and whether it was designated as a binary compatible release. Always check the developer's guide for details. For example, applications developed using ObjectARX 2018 need to be recompiled for use with AutoCAD 2019-based products. As AutoCAD 2020 is not a binary breaking release, applications built with ObjectARX for AutoCAD 2019 will work on AutoCAD 2020.