arx 正向遍历 逆向遍历 database

void AllDb()
{
    AcDbBlockTable* pBlkTbl;
    acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTbl, AcDb::kForRead);

    //获得模型空间的块表记录
    AcDbBlockTableRecord* pBlkTblRcd;
    pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb::kForRead);
    pBlkTbl->close();
    CString str = L"正向遍历";

    //创建块表记录遍历器
    AcDbBlockTableRecordIterator* pItr; //块表记录遍历器
    pBlkTblRcd->newIterator(pItr);
    pBlkTblRcd->close();
    AcDbEntity* pEnt = NULL; //遍历的临时实体指针
    for (pItr->start(); !pItr->done(); pItr->step()) {
        //利用遍历器获得每一个实体
        pItr->getEntity(pEnt, AcDb::kForWrite);

        auto id = pEnt->id();
        auto oldId = id.asOldId();
        //acutPrintf();
        str.AppendFormat(L"\n%d", oldId);

        pEnt->close();
    }
    delete pItr;

    AfxMessageBox(str);
}

void AllDb_reverse()
{
    AcDbBlockTable* pBlkTbl;
    acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTbl, AcDb::kForRead);

    //获得模型空间的块表记录
    AcDbBlockTableRecord* pBlkTblRcd;
    pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb::kForRead);
    pBlkTbl->close();
    CString str = L"逆向遍历";

    //创建块表记录遍历器
    AcDbBlockTableRecordIterator* pItr; //块表记录遍历器
    pBlkTblRcd->newIterator(pItr);
    pBlkTblRcd->close();
    AcDbEntity* pEnt = NULL; //遍历的临时实体指针
    for (pItr->start(false); !pItr->done(); pItr->step(false)) {
        //利用遍历器获得每一个实体
        pItr->getEntity(pEnt, AcDb::kForWrite);

        auto id = pEnt->id();
        auto oldId = id.asOldId();
        //acutPrintf();
        str.AppendFormat(L"\n%d", oldId);

        pEnt->close();
    }
    delete pItr;
    AfxMessageBox(str);
}