objectARX 获取指定图层上所有实体ID

2015-12-17

 //获取指定图层上所有实体ID
 AcDbObjectIdArray GetAllEntityId(const TCHAR* layername)
 {
     AcDbObjectIdArray entIds;
     bool bFilterlayer = false;
     AcDbObjectId layerId;
     //获取指定图层对象ID
     if (layername != NULL)
     {
         AcDbLayerTable *pLayerTbl = NULL;
         acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pLayerTbl, AcDb::kForRead);
         if (!pLayerTbl->has(layername))
         {
             pLayerTbl->close();
             return entIds;
         }
         pLayerTbl->getAt(layername, layerId);
         pLayerTbl->close();
         bFilterlayer = true;
     }
     //获得块表
     AcDbBlockTable *pBlkTbl = NULL;
     acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlkTbl, AcDb::kForRead);
     //块表记录
     AcDbBlockTableRecord *pBlkTblRcd = NULL;
     pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb::kForRead);
     pBlkTbl->close();
     //创建遍历器，依次访问模型空间中的每一个实体
     AcDbBlockTableRecordIterator *it = NULL;
     pBlkTblRcd->newIterator(it);
     for (it->start(); !it->done(); it->step())
     {
         AcDbEntity *pEnt = NULL;
         Acad::ErrorStatus es = it->getEntity(pEnt, AcDb::kForRead);
         if (es == Acad::eOk)
         {
             if (bFilterlayer)//过滤图层
             {
                 if (pEnt->layerId() == layerId)
                 {
                     entIds.append(pEnt->objectId());
                 }
             }
             else
             {
             //    entIds.append(pEnt->objectId());
                 pEnt->close();
             }
         }
     }
     delete it;
     pBlkTblRcd->close();
     return entIds;
 }