Get Fixed Face of Flat-Pattern Feature Example (C#)

//----------------------------------------------------------------------------
// Preconditions: Open a sheet metal part and select a Flat-Pattern feature.
//
// Postconditions:
// 1. Inspect the graphics area to see that the fixed face
//    of the Flat-Pattern feature is selected.
// 2. Press F5 to run the macro to completion.
//----------------------------------------------------------------------------

using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
using System;
namespace FixedFace2_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            Feature swFeat = default(Feature);
            FlatPatternFeatureData swFlatPatt = default(FlatPatternFeatureData);
            Face2 swFixedFace = default(Face2);
            Entity swFixedFaceEntity = default(Entity);
            bool bRet = false;

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swFeat = (Feature)swSelMgr.GetSelectedObject6(1, -1);

            swFlatPatt = (FlatPatternFeatureData)swFeat.GetDefinition();
            bRet = swFlatPatt.AccessSelections(swModel, null);

            swFixedFace = (Face2)swFlatPatt.FixedFace2;
            swFixedFaceEntity = (Entity)swFixedFace;
            bRet = swFixedFaceEntity.Select4(true, null);

  System.Diagnostics.Debugger.Break();
  // Press F5

            swFlatPatt.ReleaseSelectionAccess();

        }

        public SldWorks swApp;

    }
}