C++ ARX遍历AutoCAD图形数据库

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C++ ARX遍历AutoCAD图形数据库的代码：

void FindObjectId(AcDbObjectId & objId)
{
AcDbDatabase * pDb = acdbHostApplicationServices()->workingDatabase();
 AcDbBlockTable *pBlockTable;
 pDb->getBlockTable(pBlockTable, AcDb::kForRead);
 AcDbBlockTableRecord *pBlockTableRecord;
 pBlockTable->getAt(ACDB_MODEL_SPACE,  pBlockTableRecord, AcDb:: kForRead);
 pBlockTable->close();
 AcDbBlockTableRecordIterator *pIter;
  pBlockTableRecord- >newIterator(pIter); // Create an iterator
 for (pIter->start(); !pIter->done(); pIter->step())
            {
               ….........
               AcDbEntity *pEntity;
     if (pIter->getEntity(pEntity, AcDb::kForRead) != Acad::eOk)   continue;
               If(pEntity->isKindOf(AcDbCircle::desc())   objId = pEntity->ObjectId();
           }
 pBlockTableRecord- >close();
}

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