AutoCAD ActiveX AppendOuterLoop: Visual C++ Guide

Here are the steps to use AppendOuterLoop of Autocad ActiveX with Visual C++:

1. Create a new Visual C++ project in Visual Studio.
2. In the Solution Explorer, right-click on the project name and select 'Add Reference...'.
3. In the Reference Manager, select the 'COM' tab and search for 'AutoCAD Type Library'.
4. Select the version of AutoCAD that you have installed and click 'Add'.
5. In the code file where you want to use AppendOuterLoop, add the following include statement at the top of the file:

#import "acax17enu.tlb" raw_interfaces_only, raw_native_types, no_namespace, named_guids

6. Create an instance of the AcadLWPolyline object:

Acad::IAcadApplicationPtr pAcadApp;
Acad::IAcadDocumentPtr pAcadDoc;
Acad::IAcadModelSpacePtr pAcadModelSpace;
Acad::IAcadLWPolylinePtr pAcadLWPolyline;
pAcadApp = GetAcadApplication();
pAcadDoc = pAcadApp->ActiveDocument;
pAcadModelSpace = pAcadDoc->ModelSpace;
pAcadLWPolyline = pAcadModelSpace->AddLightWeightPolyline(_T("0,0,0"));

7. Create an instance of the AcadLoop object:

Acad::IAcadLoopPtr pAcadLoop;
pAcadLoop = pAcadLWPolyline->AppendOuterLoop();

8. Add vertices to the loop:

Acad::IAcadVertex2dPtr pAcadVertex1, pAcadVertex2, pAcadVertex3;
pAcadVertex1 = pAcadLoop->AppendVertex(1.0, 1.0);
pAcadVertex2 = pAcadLoop->AppendVertex(2.0, 1.0);
pAcadVertex3 = pAcadLoop->AppendVertex(2.0, 2.0);

9. Save the changes:

pAcadLWPolyline->Update();

10. Run the project and the LWPolyline with an outer loop and vertices will be created in AutoCAD.