>"killerxia" schrieb im Newsbeitrag
news:f0993f1.2@WebX.maYIadrTaRb...
>Thank you for your reply! But:
>1. What's NOD? I've never heard of this, can you give me more detailed
explaination?
>2. About the dictionary, now I know that if I just NEW a database, it will
return eWasOpenForRead, but if I OPEN a >database, it will return eOk. I'm
quite sure that I've never made any modification on it.
Hi,
the NOD is the Named Object Dictionary. About question number 2: What are
you doing? Are you working with AutoCAD, or a host application. I'm just
asking, because I've never seen this aproach, exept when I want to open a
database myself, which normally Acad does for me.
O.K, here is an example of adding things to the NOD:
//-------------------
// Open the named object dictionary, check if there is
// an entry with the key "ASDK_DICT". If not, create a
// dictionary and add it.
//
AcDbDictionary *pNamedObj;
AcDbDictionary *pNameList;
// ... get the active Database
AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();
// ... get the NOD
pDb->getNamedObjectsDictionary(pNamedObj, AcDb::kForWrite);
// ... get the branch, you need
if (pNamedObj->getAt("ASDK_DICT", (AcDbObject*&)pNameList,
AcDb::kForWrite) == Acad::eKeyNotFound)
{
pNameList = new AcDbDictionary;
AcDbObjectId DictId;
pNamedObj->setAt("ASDK_DICT", pNameList, DictId);
}
pNamedObj->close();
// ... Do someting with pNameList
AsdkObjectToNotify *pObj = new SomeKindOfObject;
// ... this will add the object into the NOD, in the ASDK_DICT branch
// ... with the name "Name_of_the_entry"
AcDbObjectId objId;
if ((pNameList->getAt("Name_of_the_entry", objId))== Acad::eKeyNotFound)
{
pNameList->setAt("Name_of_the_entry", pObj, objId);
pObj->close();
}
else
{
delete pObj;
acutPrintf("object_to_notify_A already exists\n");
}
// ... never forget this:
pNameList->close();
//-------------------------------------------------
This is taken from the "persreac" ARX sample, where an persisten Reactor is
added to the NOD.
I hope this helped you a bit, but it needs databases, that are in the
"healthy" state. It is unsafe, or impossible to access a database e.g. from
AcDbObject::dwgInFields(..).
If you want to access a database in another context, like building you own
db, I need to have more details, or even better some code pieces.
Cheers,
Andy
