Datum on a Spline, Automation Error Help

[Twullf]

I am writing a program which will go into an assembly part, and place a Datum on a spline, which will be brought in with one of the assembly components.

I am manually selecting the spline, and I am having the following error:

NXOpen.NXException:Internal error: memory access violation
at NXOpen.Section.AddToSection(SelectionIntentRule[] rules, NXObject seed, NXObject startConnector, NXObject endConnector, Point3d helpPoint, Mode featureMOde, Boolean chainWithinFeature)
at select_a_spline.Main()

The code is as follows

      If (SelectSpline(spline1) = Selection.Response.ObjectSelected) Then
         datumPlaneBuilder1 = workPart.Features.CreateDatumPlaneBuilder(nullFeatures_Feature)
         unit1 = CType(workPart.UnitCollection.FindObject("MilliMeter"), Unit)

         plane1 = datumPlaneBuilder1.GetPlane()

         section2 = workPart.Sections.CreateSection(0.02413, 0.0254, 0.5)

         expression2 = workPart.Expressions.CreateSystemExpressionWithUnits("0", unit1)
         plane1.SetUpdateOption(SmartObject.UpdateOption.WithinModeling)

         curves1(0) = spline1
         'SplinePoint = New Point3d( 0, 0, 0 )
         helpPoint2 = New Point3d(-2.36825229556759e-005, 0.0, 1124.15035257941)
         curveDumbRule1 = workPart.ScRuleFactory.CreateRuleCurveDumb(curves1)
         rules1(0) = curveDumbRule1
         'section2.AllowSelfIntersection(False)
         section2.AddToSection(rules1, spline1, nullNXObject, nullNXObject, helpPoint2, Section.Mode.Create, False)

         geom1(0) = section2

         plane1.SetMethod(PlaneTypes.MethodType.Frenet)
         plane1.SetGeometry(geom1)
         plane1.ReplaceExpression(expression2)
         plane1.SetFrenetSubtype(PlaneTypes.FrenetSubtype.Tangent)
         plane1.SetReverseSection(False)
         plane1.SetAlternate(PlaneTypes.AlternateType.One)
         plane1.SetPercent(False)
         plane1.SetExpression("2000")
         plane1.Evaluate()

         flip1 = plane1.Flip

         feature3 = datumPlaneBuilder1.CommitFeature()

         datumPlane1 = datumPlaneFeature1.DatumPlane
         datumPlane1.SetReverseSection(False)
         datumPlaneBuilder1.Destroy()

I think the problem is with the section2.AddToSection, but I've been fighting it for several days and have not been able to resolve the issue.

Any help would be greatly appreciated.

 

[ufsure]

The error message seems to indicate that you are getting an exception in your select_a_spline function. If not, make sure all the objects are valid by printing out some information before section2.AddToSection.



Suresh

http://www.technisites.com.au