不打开CAD 读取.dwg文件内部的实体元素的信息

bgl_820601

在不打开CAD软件的情况下，通过程序读取.dwg文件内部的实体元素的信息，这个想法能否实现，若能实现用什么技术可以实现，希望版主和对这方面了解的同仁给与解答。

JOLMO

有的，ODT技术就是做这个的

liusun1982

朋友,我和你的问题一样,搞出来了没?

YANGGY

如下代码可以实现

void
clone3()
{
    AcDbObjectId id;
    AcDbObjectIdArray list;
    AcDbDatabase extDatabase( Adesk::kFalse );
    char dwgName[_MAX_PATH];

    if (RTNORM != getFile( "Enter DWG name", "Select Drawing", "dwg",
                           dwgName ))
    {
        return;
    }
    if (Acad::eOk != extDatabase.readDwgFile( dwgName ))
    {
        acedAlert( "Error reading DWG!" );
        return;
    }
 extDatabase.
    AcDbBlockTable* pBT;
    if (Acad::eOk != extDatabase.getSymbolTable( pBT, AcDb::kForRead ))
    {
        acedAlert( "Error getting BlockTable of DWG" );
        return;
    }
    AcDbBlockTableRecord* pBTR;
    Acad::ErrorStatus es = pBT->getAt( ACDB_MODEL_SPACE, pBTR, AcDb::kForRead );
    pBT->close();
    if (Acad::eOk != es) {
        acedAlert( "Error getting model space of DWG" );
        return;
    }

    AcDbBlockTableRecordIterator* pIT;
    if (Acad::eOk != pBTR->newIterator( pIT )) {
        acedAlert( "Error iterating model space of DWG" );
        pBTR->close();
        return;
    }

    for ( ; !pIT->done(); pIT->step()) {
        if (Acad::eOk == pIT->getEntityId( id )) {
            list.append( id );

            // There is a bug in ARX that causes extension dictionaries
            // to appear to be soft owners of their contents.  This causes
     // the contents to be skipped during wblock.  To fix this we
     // must explicitly tell the extension dictionary to be a hard
     // owner of it's entries.
            //
            AcDbEntity *pEnt;
            if ( Acad::eOk == pIT->getEntity(pEnt, AcDb::kForRead)) {
                AcDbObjectId obj;
                if ((obj = pEnt->extensionDictionary())
                    != AcDbObjectId::kNull)
                {
                    AcDbDictionary *pDict = NULL;
                    acdbOpenObject(pDict, obj, AcDb::kForWrite);
                    if (pDict) {
                        pDict->setTreatElementsAsHard(Adesk::kTrue);
                        pDict->close();
                    }
                }
                pEnt->close();
            }
        }
    }

    delete pIT;
    pBTR->close();

    if (list.isEmpty()) {
        acedAlert( "No entities found in model space of DWG" );
        return;
    }

    AcDbDatabase *pTempDb;

    if (Acad::eOk != extDatabase.wblock( pTempDb, list, AcGePoint3d::kOrigin ))
    {
        acedAlert( "wblock failed!" );
        return;
    }
    if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()
        ->insert( AcGeMatrix3d::kIdentity, pTempDb ))
        acedAlert( "insert failed!" );

    delete pTempDb;
}