Code Red > .NET

Getting extremely "large" negative block referece handles

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Nightcrawler:
When I get handles for block references they usually look something like 153919. But for certain files I get handles that look like -4066801656873546453!
And when I try to get the block reference by that handle it throws an "eUnknownHandle" and crashes my AutoCAD instance.


--- Code: ---long handle = -4066801656873546453;
Handle hn = new Handle(handle);
ObjectId blockId = sideDb.GetObjectId(false, hn, 0); // Crashes here!
--- End code ---

It seems like a fairly uncommon issue as I've processed thousands of files without any problems. And even files in the same project works.

Anybody knows why this occurs, and what can I do to get the block reference when this occurs?

dgorsman:
Where are these handles coming from - xdata?  Xrecords?

Rough guess, if from those there was some bad code modifying the wrong variable resulting into an unusable number or causing a numeric overflow from data type restrictions.  Either way there is no way of getting the actual handle value back.

huiz:
Maybe you can fix it with the Audit command.


The large number looks like the minimum value of a long. It is negative and thus not valid. It might get fixed.

Nightcrawler:
@dgorsman I'm not sure what they are called tbh. I'm fairly inexperienced with the Autocad API, but this is how I get them:


--- Code: ---using (var transaction = db.TransactionManager.StartTransaction())
{
    var layoutEntries = transaction.GetObject(db.LayoutDictionaryId, OpenMode.ForRead) as DBDictionary;

    foreach (DBDictionaryEntry layoutEntry in layoutEntries)
    {
        var layout = transaction.GetObject(layoutEntry.Value, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Layout;
        var fileRecords = transaction.GetObject(layout.BlockTableRecordId, OpenMode.ForRead) as BlockTableRecord;

        foreach (ObjectId id in fileRecords)
        {
            var blockRef = transaction.GetObject(id, OpenMode.ForRead) as BlockReference;
            var handle = blockRef.Handle.Value,
            var name = blockRef.Name,

            ...
        }
    }

    transaction.Abort();
}

--- End code ---

@huiz, that's not a bad guess, but when I look at a couple of other handles I see values like -4066801656856679638, -4066801656856679152, -646675092. So not all are the same.
Running AUDIT on the model, as well as RECOVERALL I get this output "objects auditedAcDbBlockTableRecord: "A$C431C598E", XData Handle Unknown, Null" and then Autocad just hangs...

gile:
Hi,

Try replacing:

--- Code - C#: ---var blockRef = transaction.GetObject(id, OpenMode.ForRead) as BlockReference;var handle = blockRef.Handle.Value,var name = blockRef.Name,with:

--- Code - C#: ---var blockRef = transaction.GetObject(id, OpenMode.ForRead) as BlockReference;if (blockRef != null){    var handle = blockRef.Handle.Value;    var name = blockRef.Name;    // ...}because layout's block table records contain entities which are not block references (at least one Viewport).

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