Visual LISP, AutoLISP and General Customization

[#1]

Hi,

Has anyone tried retrieving an ActiveX selection set in AutoCAD 2013 (AutoCAD Architecture 64bit on Windows 7 is what I am using)?

Using a piece of LISP I got from the ADN developer site, it no longer works and gives this error....

Cannot invoke (command) from *error* without prior call to (*push-error-using-command*).
Converting (command) calls to (command-s) is recommended.

(defun c:erset (/ acApp acDoc selSets ss1)
   (vl-load-com)
   (setq acApp (vlax-get-acad-object))
   (setq acDoc (vla-get-activeDocument acApp))
   (setq selSets (vla-get-SelectionSets acDoc))
   (setq ss1 (vla-item selSets "TEST1"))
   (princ "Number of items in selection set TEST1 = ")
   (princ (vla-get-count ss1))
   (if (> (vla-get-count ss1) 0)
      (progn
         (alert "Erasing objects in selection set TEST1")
         (vla-erase ss1)
      ) ;progn
   ) ;if
   (princ)
) ;defun

Same with a similar one I found via google and have been using it for years. Unfortunatley my lisp is very basic so I have little idea if it an be fixed!

(defun c:getSset()
(vl-load-com)
(setq ss-vba (vla-item
(vla-get-selectionsets
(vla-get-activedocument
(vlax-get-acad-object)))
"SSforLisp"));; gets the ActiveX SS
(setq ss-lisp (ssadd));;creates a new ename-based ss
(vlax-for ent ss-vba
(ssadd (vlax-vla-object->ename ent) ss-lisp)
);;add each object's ename to the ename-ss
)

What about creating an AutoLisp selection set from .NET - is it possible, if so I would prefer to do that instead?

The goal is to create some objects in .NET (using activeX or managed code) and then have some way to access these objects via the command line I'm assuming they only way is using an AutoLISP selection set.

Many thanks,

Graham

MiTek Industries

[#2]

UPDATE...

I found a sample to transfer a selection set into lisp (using a VB.NET lisp function). Not tested it out yet but it looks promising, I think I need to transfer my activex objects into managed ones and then build a selection set and result buffer?

        <LispFunction("MyLispFunction2")> _
            Public Function VBNetFunction4(ByVal myLispArgs As ResultBuffer) As ResultBuffer
 
            Dim rbfResult As ResultBuffer
            Dim ed As Autodesk.AutoCAD.EditorInput.Editor
            ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor
 
            Dim prmptSelOpts As New PromptSelectionOptions()
            Dim prmptSelRes As PromptSelectionResult
 
            prmptSelRes = ed.GetSelection(prmptSelOpts)
 
            If prmptSelRes.Status <> PromptStatus.OK Then
                rbfResult = New ResultBuffer(New TypedValue(5019))
                Return rbfResult
 
            End If
 
            Dim selSet As SelectionSet
            selSet = prmptSelRes.Value
            rbfResult = New ResultBuffer( _
                        New TypedValue(CInt(5007), selSet))
            Return rbfResult
        End Function

[#3]

Arrrghh!

Just tested it and it gives the same error message as the other examples!!!

[#4 · Accepted solution]

Worked on my end with small changes:

        <LispFunction("MyLispFunction2")> _
        Public Function VBNetFunction4(ByVal myLispArgs As ResultBuffer) As ResultBuffer

            Dim rbfResult As ResultBuffer
            Dim ed As Autodesk.AutoCAD.EditorInput.Editor
            ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor

            Dim prmptSelOpts As New PromptSelectionOptions()
            prmptSelOpts.MessageForRemoval = vbLf + "Nothing selected"
            prmptSelOpts.MessageForAdding = vbLf + "Select some objects:"
            Dim prmptSelRes As PromptSelectionResult

            prmptSelRes = ed.GetSelection(prmptSelOpts)

            If prmptSelRes.Status <> PromptStatus.OK Then
                rbfResult = New ResultBuffer(New TypedValue(5019))
                Return rbfResult

            End If

            Dim selSet As SelectionSet
            selSet = prmptSelRes.Value
            ed.SetImpliedSelection(selSet)
            rbfResult = New ResultBuffer( _
                        New TypedValue(CInt(5007), ed.SelectImplied.Value))
            Return rbfResult
        End Function

 In the command line I've typed

(setq sset (MyLispFunction2))

Another way with using pickfirstselectionset,

see what this function will retain for you:

        '   (selected objects)    
        <LispFunction("ListSelected")> _
        Public Shared Function ListSelected(resBufIn As ResultBuffer) As ResultBuffer
            Dim doc As Document = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument
            Dim db As Database = doc.Database
            Dim ed As Editor = doc.Editor
            Dim blkId As ObjectId = db.BlockTableId
            Dim resBufOut As New ResultBuffer()
            If ed.SelectImplied.Value.Count = 0 Then
                ed.WriteMessage(vbLf + "Works with previously selected objects only!")
                resBufOut.Add(New TypedValue(CInt(LispDataType.Nil)))
            Else
                Using tr As Transaction = db.TransactionManager.StartOpenCloseTransaction()
                    Dim bt As BlockTable = TryCast(tr.GetObject(blkId, OpenMode.ForRead), BlockTable)
                    resBufOut.Add(New TypedValue(CInt(LispDataType.ListBegin)))
                    Dim sset As SelectionSet = ed.SelectImplied.Value
                    For Each sobj As SelectedObject In sset
                        resBufOut.Add(New TypedValue(CInt(LispDataType.ObjectId), sobj.ObjectId))
                    Next
                    resBufOut.Add(New TypedValue(CInt(LispDataType.ListEnd)))
                End Using
            End If
            Return resBufOut
        End Function
        '' usage : (setq entlist (ListSelected))

[#5]

Worked like a charm thanks!

[#6]

Glad to hear that,

Kind regards,

Cheers