static void swtArxProject5readdwg(void)    {        // Add your code for command swtArxProject5.readdwg here        //打开测试文件test.dwg        AcDbDatabase *pDb=new AcDbDatabase(Adesk::kFalse);        pDb->readDwgFile(_T("c:/test.dwg"));        //获取块表        AcDbBlockTable *pBlkTbl;        pDb->getSymbolTable(pBlkTbl,AcDb::kForRead);        //获取块表记录        AcDbBlockTableRecord *pBlkRcd;        pBlkTbl->getAt(ACDB_MODEL_SPACE,pBlkRcd,AcDb::kForWrite);        pBlkTbl->close();        //建立迭代器准备进行循环        AcDbBlockTableRecordIterator *pBlkTblRcdltr;        pBlkRcd->newIterator(pBlkTblRcdltr);        //定义实体指针        AcDbEntity *pEnt;        //在读入的块表记录中进行迭代        for (pBlkTblRcdltr->start();!pBlkTblRcdltr->done();pBlkTblRcdltr->step())        {            //读取实体            pBlkTblRcdltr->getEntity(pEnt,AcDb::kForRead);            //pEnt=pBlkTblRcdltr->getEntity(AcDb::kForRead);            //获取实体类型            acutPrintf(_T("\n实体类型：%s"),pEnt->isA()->name());            //关闭实体指针            pEnt->close();        }        //关闭块表        pBlkRcd->close();        //删除块表记录迭代器        delete pBlkTblRcdltr;        //删除图形        delete pDb;    }