标题如何在ObjectARX或。net中访问AutoCAD实体的子实体?

下面是c++和c#中的两个示例，它们演示了如何访问AssocPersSubentityIdPE并使用它遍历所选实体的顶点和边缘。

void ArxSubEntityPE(){Acad::ErrorStatus err;ads_name name;ads_point pt;if(acedEntSel(L"\nSelect an Entity: ", name, pt) != RTNORM)return;AcDbObjectId id;acdbGetObjectId(id, name);AcDbObjectPointer <AcDbEntity> pEntity(id, AcDb::kForRead);// Get the Protocol extension associated with the entityAcDbAssocPersSubentIdPE* const pAssocPersSubentIdPE =AcDbAssocPersSubentIdPE::cast(pEntity->queryX(AcDbAssocPersSubentIdPE::desc()));if( pAssocPersSubentIdPE == NULL)return;AcArray <AcDbSubentId> vertexIds;pAssocPersSubentIdPE->getAllSubentities(pEntity,AcDb::kVertexSubentType,vertexIds);acutPrintf(L"\n- Vertex Subentities: ");for (int i = 0; i<vertexIds.length(); ++i){AcDbFullSubentPath path(id, vertexIds[i]);AcDbPoint* pPoint = AcDbPoint::cast(pEntity->subentPtr(path));if (pPoint != NULL){AcGePoint3d pos = pPoint->position();acutPrintf(L"\n . Vertex: [%.2f, %.2f, %.2f]",pos.x, pos.y, pos.z);delete pPoint;}}AcArray <AcDbSubentId> edgeIds;pAssocPersSubentIdPE->getAllSubentities(pEntity,AcDb::kEdgeSubentType,edgeIds);acutPrintf(L"\n- Edge Subentities: ");for (int i = 0; i<edgeIds.length(); ++i){AcDbFullSubentPath path(id, edgeIds[i]);AcDbEntity* pSubEntity = pEntity->subentPtr(path);if (pSubEntity != NULL){acutPrintf(L"\n . %s (Id = %d)",pSubEntity->isA()->name(),edgeIds[i].index());delete pSubEntity;}}}

[CommandMethod("SubEntityPE")]public void SubEntityPE(){Document doc = Application.DocumentManager.MdiActiveDocument;Database db = doc.Database;Editor ed = doc.Editor;PromptEntityOptions peo = new PromptEntityOptions("\nSelect an Entity: ");PromptEntityResult per = ed.GetEntity(peo);if (per.Status != PromptStatus.OK)return; using (Transaction Tx = db.TransactionManager.StartTransaction()){Entity entity = Tx.GetObject(per.ObjectId, OpenMode.ForRead)as Entity;ObjectId[] entId = new ObjectId[] { entity.ObjectId };IntPtr pSubentityIdPE = entity.QueryX(AssocPersSubentityIdPE.GetClass(typeof(AssocPersSubentityIdPE)));if (pSubentityIdPE == IntPtr.Zero)//Entity doesn't support the subentityPEreturn;AssocPersSubentityIdPE subentityIdPE =AssocPersSubentityIdPE.Create(pSubentityIdPE, false)as AssocPersSubentityIdPE;SubentityId[] vertexIds = subentityIdPE.GetAllSubentities(entity,SubentityType.Vertex);ed.WriteMessage("\n- Vertex Subentities: ");foreach (SubentityId subentId in vertexIds){FullSubentityPath path = new FullSubentityPath(entId, subentId);DBPoint vertex = entity.GetSubentity(path) as DBPoint;if (vertex != null){ed.WriteMessage("\n . Vertex: [{0}, {1}, {2}]",vertex.Position.X,vertex.Position.Y,vertex.Position.Z);vertex.Dispose();}}SubentityId[] edgeIds = subentityIdPE.GetAllSubentities(entity,SubentityType.Edge);ed.WriteMessage("\n- Edge Subentities: ");foreach (SubentityId subentId in edgeIds){FullSubentityPath path = new FullSubentityPath(entId, subentId);Entity edgeEntity = entity.GetSubentity(path);if (edgeEntity != null){ed.WriteMessage("\n . " + edgeEntity.ToString());edgeEntity.Dispose();}}SubentityId[] faceIds = subentityIdPE.GetAllSubentities(entity,SubentityType.Face);ed.WriteMessage("\n- Face Subentities: ");foreach (SubentityId subentId in faceIds){FullSubentityPath path = new FullSubentityPath(entId, subentId);Entity faceEntity = entity.GetSubentity(path);if (faceEntity != null){ed.WriteMessage("\n . " + faceEntity.ToString());faceEntity.Dispose();}}}}