Create On-surface Spline Example (C#)

This example shows how to create a spline constrained to a surface.

//---------------------------------------------------------------------------- 
// Preconditions: Open public_documents\samples\tutorial\api\cstick.sldprt. 
// 
// Postconditions: 
// 1. Creates a 3D sketch of a spline on a face.
// 2. Inspect the graphics area.
//
// NOTE: Because the model is used elsewhere, do not save changes.
//----------------------------------------------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
 
 
namespace CreateSurfSpline_CSharp
{
    public partial class SolidWorksMacro
    {
        public void Main()
        {
 
            Face2 swCurFace = default(Face2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            ModelDoc2 Part = default(ModelDoc2);
            SketchSegment skSegment = default(SketchSegment);
            object pointArray = null;
            double[] points = new double[12];
            object[] surfs = new object[1];
            Surface[] surfaceArr = new Surface[1];
            int selType = 0;
            int surfaceArrUbound = 0;
            object statuses = null;
            bool boolstatus = false;
 
            Part = (ModelDoc2)swApp.ActiveDoc;
 
 
            points[0] = -0.0334270787209949;
            points[1] = 0.0223913424029847;
            points[2] = 0.053671471463652;
            points[3] = 0.0153063989576147;
            points[4] = 0.0478899892864157;
            points[5] = 0.0250019220828396;
            points[6] = 0.0511644715447442;
            points[7] = 0.0272060072570875;
            points[8] = 0.00578476387745854;
            points[9] = 0.00259263831071606;
            points[10] = 0.0262831648993199;
            points[11] = -0.053206707614433;
            pointArray = points;
 
            boolstatus = Part.Extension.SelectByRay(0.030303902514845, 0.0286262382667246, 0.0385109058888133, -0.577381545199981, -0.577287712085548, -0.577381545199979, 0.00178932209693826, 2, false, 0,
            0);
 
            swSelMgr = (SelectionMgr)Part.SelectionManager;
 
            selType = swSelMgr.GetSelectedObjectType3(1, -1);
            surfaceArrUbound = -1;
            if (selType == (int)swSelectType_e.swSelFACES)
            {
                swCurFace = (Face2)swSelMgr.GetSelectedObject6(1, -1);
                surfaceArrUbound = surfaceArrUbound + 1;
                surfaceArr[surfaceArrUbound] = (Surface)swCurFace.GetSurface();
            }
 
            surfs = surfaceArr;
 
            DispatchWrapper[] dispArray = null;
            dispArray = ObjectArrayToDispatchWrapperArray(surfaceArr);
 
            //Set the Direction parameter to an array of null DispatchWrappers 
            //to use the view vector of the current view to project the points in pointArray 
            //onto the surface in dispArray
            DispatchWrapper dirArray = default(DispatchWrapper);
            dirArray = new DispatchWrapper(null);
 
            skSegment = (SketchSegment)Part.SketchManager.CreateSpline3((pointArray), dispArray, dirArray, true, out statuses);
            Part.SketchManager.InsertSketch(true);
        }
        public DispatchWrapper[] ObjectArrayToDispatchWrapperArray(Surface[] Objects)
        {
            int ArraySize = 0;
            ArraySize = Objects.GetUpperBound(0);
            DispatchWrapper[] d = new DispatchWrapper[ArraySize + 1];
            int ArrayIndex = 0;
            for (ArrayIndex = 0; ArrayIndex <= ArraySize; ArrayIndex++)
            {
                d[ArrayIndex] = new DispatchWrapper(Objects[ArrayIndex]);
            }
            return d;
        }
 
        // The SldWorks swApp variable is pre-assigned for you.
        public SldWorks swApp;
 
    }
}