Add Damper to Motion Study Example (C#)

//----------------------------------------------------------------------------
// Preconditions:
// 1. Open install_dir\samples\tutorial\api\wrench.sldasm.
// 2. Click View > MotionManager if the MotionStudy tabs are not visible.
// 3. Click Tools > Add-ins > SOLIDWORKS Motion to enable motion analysis.
// 4. Reference the SOLIDWORKS MotionStudy type library.
//
// Postconditions:
// 1. Adds a damper feature, LinearDamper1, between the grips of the wrench.
// 2. Examine the Motion Analysis to verify.
//
// NOTE: Because the assembly is used elsewhere, do not save changes.
//----------------------------------------------------------------------------
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Windows.Forms;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using SolidWorks.Interop.swmotionstudy;
using System.Runtime.InteropServices;
namespace SimulationDamperFeatureData_CSharp.csproj
{
    partial class SolidWorksMacro
    {


        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            ModelDocExtension swModelDocExt = default(ModelDocExtension);
            MotionStudyManager swMotionMgr = default(MotionStudyManager);
            MotionStudy swMotionStudy1 = default(MotionStudy);
            SimulationDamperFeatureData swDamperFeat = default(SimulationDamperFeatureData);
            bool boolstatus = false;
            Feature swFeat = default(Feature);
            SelectionMgr swSelMgr = default(SelectionMgr);

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swModelDocExt = swModel.Extension;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;

            // Get the MotionManager
            swMotionMgr = (MotionStudyManager)swModelDocExt.GetMotionStudyManager();

            if ((swMotionMgr == null))
            {
                return;
            }

            // Get and activate "MotionStudy1_Distance=0.5in"
            swMotionStudy1 = swMotionMgr.GetMotionStudy("MotionStudy1_Distance=0.5in");

            if ((swMotionStudy1 == null))
            {
                MessageBox.Show("MotionStudy1_Distance=0.5in is not available.");
                return;
            }

            // Activate swMotionStudy1
            swMotionStudy1.Activate();

            // Define Damper feature
            swDamperFeat = (SimulationDamperFeatureData)swMotionStudy1.CreateDefinition((int)swFeatureNameID_e.swFmAEMLinearDamper);

            if (swDamperFeat == null)
            {
                Debug.Print("ERROR: Creation of Damper feature data object failed.");
                return;
            }

            // Select the faces for the Damper's endpoints
            Face2 swFace1 = default(Face2);
            Face2 swFace2 = default(Face2);

            swModel.ShowNamedView2("*Left", 3);
            swModel.ViewZoomtofit2();
            boolstatus = swModelDocExt.SelectByID2("", "FACE", 0.03344586330968, 0.0525345575174, 0, true, 0, null, 0);
            swFace1 = (Face2)swSelMgr.GetSelectedObject6(1, -1);
            boolstatus = swModelDocExt.SelectByID2("", "FACE", 0.02244533711473, 0.0131288302002, 0.0002238961779386, true, 0, null, 0);
            swFace2 = (Face2)swSelMgr.GetSelectedObject6(2, -1);

            // Set Damper's characteristics
            swDamperFeat.SetEndPoints(swFace1, swFace2);

            // Create Damper feature
            swFeat = (Feature)swMotionStudy1.CreateFeature(swDamperFeat);

            if (swFeat == null)
            {
                Debug.Print(" ERROR: Creation of the Damper feature failed.");
            }
            else
            {
                Debug.Print("Type of Damper as defined in swSimulationDamperType_e: " + swDamperFeat.Type);
            }

        }

        public SldWorks swApp;

    }
}