Get GTol Witness Line Example (C#)

//---------------------------------------------------------------------------
// Preconditions:
// 1. Open:
//    install_dir\samples\tutorial\api\GTolWitnessLine.slddrw
// 2. Rename the namespace to match the name of your C# project.
// 3. Select the geometric tolerance frame.
// 4. Open an Immediate window.
//
// Postconditions: Inspect the Immediate window for the
// witness line start and end point coordinates.
//
// NOTE: Because the model is used elsewhere,
// do not save changes when closing it.
//---------------------------------------------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System;
using System.Diagnostics;
namespace GTolWitnessLine_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        ModelDoc2 swModel;
        ModelDocExtension swModelDocExt;
        SelectionMgr swSelMgr;
        Gtol selGtol;
        int i;

        object coords;
        Double[] dbls;

        public void Main()
        {
            swModel = (ModelDoc2)swApp.ActiveDoc;
            swModelDocExt = swModel.Extension;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            selGtol = (Gtol)swSelMgr.GetSelectedObject6(1, 0);

            selGtol.SetPosition(0.433, 0.432, 0.0);
            swModel.ForceRebuild3(false);

            coords = selGtol.GetWitnessLine();
            dbls = (Double[])coords;

            for (i = 0; i < dbls.Length; i++)
            {
                Debug.Print(dbls[i].ToString());
            }
        }

        public SldWorks swApp;

    }
}