AcDbObjectId PostToModelSpace(AcDbEntity *pEnt){    //定义块表    AcDbBlockTable *pBlk;    acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlk,AcDb::kForRead);    //定义块表记录    AcDbBlockTableRecord *pBlkTblRcd;    pBlk->getAt(ACDB_MODEL_SPACE,pBlkTblRcd,AcDb::kForWrite);    pBlk->close();    //定义ID    AcDbObjectId id;    pBlkTblRcd->appendAcDbEntity(id,pEnt);    pEnt->close();    return id;}