eLockViolation when trying to draw from a command on a form

[Anonymous]

Hi,

I am getting the following error "An unhandled exception of type
'Autodesk.AutoCAD.Runtime.Exception' occurred in acdbmgd.dll Additional
information: eLockViolation" when trying to draw (using the sample in Lab3)
from a form button command. I couldn't get a normal windows app to reference
autocad so I added a form to a class library then show it from autocad. The
eLockViolation occurrs when I get to the line Dim bt As BlockTable =
trans.GetObject(db.BlockTableId, OpenMode.ForWrite). This all runs OK when
it is started from the command prompt but when started from a button on the
form the error happens.

Does anyone have any idea how to cure this. I can read data fine from other
button commands on the form so it is addressing the drawing OK.

Cheers,

Simon

Public Function CreateEmployee()
Dim db As Database = HostApplicationServices.WorkingDatabase()

Dim trans As Transaction = db.TransactionManager.StartTransaction()

Try

ERROR HERE>>>>>>>Dim bt As BlockTable = trans.GetObject(db.BlockTableId,
OpenMode.ForWrite)

Dim btr As BlockTableRecord = trans.GetObject(bt(btr.ModelSpace),
OpenMode.ForWrite)

'Create the block reference...use the return from CreateEmployeeDefinition
directly!

Dim br As New BlockReference(New Point3d(10, 10, 0),
CreateEmployeeDefinition())

btr.AppendEntity(br) 'Add the reference to ModelSpace

trans.AddNewlyCreatedDBObject(br, True) 'Let the transaction know about it

trans.Commit()

Finally

trans.Dispose()

End Try

End Function

[Anonymous]

Try locking the document before opening the block table for write.

[Anonymous]

Is it not something to do with Document.LockDocument() method. see LAB 6

Laurence

"Simon" wrote in message
news:4868495@discussion.autodesk.com...
Hi,

I am getting the following error "An unhandled exception of type
'Autodesk.AutoCAD.Runtime.Exception' occurred in acdbmgd.dll Additional
information: eLockViolation" when trying to draw (using the sample in Lab3)
from a form button command. I couldn't get a normal windows app to reference
autocad so I added a form to a class library then show it from autocad. The
eLockViolation occurrs when I get to the line Dim bt As BlockTable =
trans.GetObject(db.BlockTableId, OpenMode.ForWrite). This all runs OK when
it is started from the command prompt but when started from a button on the
form the error happens.

Does anyone have any idea how to cure this. I can read data fine from other
button commands on the form so it is addressing the drawing OK.

Cheers,

Simon

Public Function CreateEmployee()
Dim db As Database = HostApplicationServices.WorkingDatabase()

Dim trans As Transaction = db.TransactionManager.StartTransaction()

Try

ERROR HERE>>>>>>>Dim bt As BlockTable = trans.GetObject(db.BlockTableId,
OpenMode.ForWrite)

Dim btr As BlockTableRecord = trans.GetObject(bt(btr.ModelSpace),
OpenMode.ForWrite)

'Create the block reference...use the return from CreateEmployeeDefinition
directly!

Dim br As New BlockReference(New Point3d(10, 10, 0),
CreateEmployeeDefinition())

btr.AppendEntity(br) 'Add the reference to ModelSpace

trans.AddNewlyCreatedDBObject(br, True) 'Let the transaction know about it

trans.Commit()

Finally

trans.Dispose()

End Try

End Function

[Anonymous]

Hi,
I'm starting programing with autocad and vb.net and I'm getting the same error in the same situation.
And my question is: Did you resolve this problem? I've been serching for a solution, but I cannot find anything about "elockViolation" error.

I really apreciate your answer, thanks.

Jordi J.

[Hallex]

Welcome to the forum 🙂

See post #2 from there:
http://discussion.autodesk.com/forums/thread.jspa?messageID=6235293?

~'J'~ Edited by: hallex on Mar 8, 2010 7:38 PM

[marty76]

I had similar problem with the same error by using modeless dialog in my application.

Dolument.LockDocument()

before opening BlockTable solved my problem