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Thread: New function in ObjectARX for LISP

  1. #1
    Woo! Hoo! my 1st post
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    Smile New function in ObjectARX for LISP

    Good morning, I would like to ask a favor, could someone give me an example of how to create a new function in ObjectARX for LISP? and how could put on and take values ​​in Lisp from ObjectARX?

    Thank you very much now

  2. #2
    Administrator BlackBox's Avatar
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    Default Re: New function in ObjectARX for LISP

    Welcome to AUGI, and congrats on your first post!

    Here's an excerpt from ArxDev.chm on the LispFuncton Method, which is part of the ObjectARX SDK:

    Quote Originally Posted by ArxDev.chm, Defining Methods That Can Be Called From AutoLISP

    Defining Methods That Can Be Called From AutoLISP

    Managed applications can define methods so that they can be called by AutoLISP applications. To do so, the managed application tags the desired method with the Autodesk.AutoCAD.Runtime.LispFunction attribute. This attribute can be used in the same places and has the same properties as the CommandMethod attribute. The key difference lies in the signature form to which LispFunction may be applied. LispFunction is valid only for methods of the form

    public  ResultType MyHandler(ResultBuffer args) {
    where ResultType can be any one of the following types:

    • int
    • double
    • TypedValue
    • ResultBuffer
    • string
    • Point2d
    • Point3d
    • bool
    • void
    • ObjectId
    • SelectionSet

    The Autodesk.AutoCAD.Runtime.LispDataType enumeration defines .NET identifiers that represent the data types passed through AutoLISP ResultBuffer arguments.

    For instance, the following C# code defines an AutoLISP-callable “Hello World” method:

    using Autodesk.AutoCAD.Runtime;
    using Autodesk.AutoCAD.EditorInput;
    using Autodesk.AutoCAD.ApplicationServices;
    public void hw(ResultBuffer args)
        Editor ed = 
        ed.WriteMessage('\n' + "Hello World!" + '\n');
    ... There are a lot more examples of custom LispFunction Methods in .NET API (specifically C#) - this post includes one such example.

    "How we think determines what we do, and what we do determines what we get."

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