Just wondering how I would return attributes of blocks in my drawing's XRefs?
I've come across one example that is in VB but doesn't really help me much.
I currently have a list in a form that consists of all the XRefs in my drawing and I wish to return all blocks and attributes that are linked to the selected XRef.
Solved! Go to Solution.
Public Sub listAttRefInXRef() Dim tBl As AcadBlock For Each tBl In ThisDrawing.Blocks If tBl.IsXRef Then 'ok, we got a XRef, now scan it's modelspace for BlockReferences Dim tEnt As AcadEntity For Each tEnt In tBl.XRefDatabase.ModelSpace If TypeOf tEnt Is AcadBlockReference Then Dim tBlRef As AcadBlockReference Set tBlRef = tEnt If tBlRef.HasAttributes Then 'BlockReference has AttributeReferences Dim tAtts As Variant Dim i As Integer tAtts = tBlRef.GetAttributes For i = LBound(tAtts) To UBound(tAtts) 'output each AttributeReference Debug.Print tBlRef.Handle & " " & tAtts(i).TagString & ": " & tAtts(i).TextString Next End If End If Next End If Next End Sub
HTH, - alfred -
Thanks for your response Alfred!
Im sorry but I forgot to mention that I would be trying to achieve this in VB.net
This is what I currently have going but am stuck at a roadblock:
Dim ed As Editor = Application.DocumentManager.MdiActiveDocument.Edit
Dim doc As Document = Application.DocumentManager.MdiActiveDocument
Dim db As Database = HostApplicationServices.WorkingDatabase
Dim tr As Transaction = db.TransactionManager.StartTransaction()
Dim res As PromptSelectionResult = ed.SelectAll
Dim selSet As SelectionSet = res.Value
Dim idArray As ObjectId() = selSet.GetObjectIds()
For Each blkId As ObjectId In idArray
Dim obj As DBObject = tr.GetObject(blkId, OpenMode.ForRead)
Dim blkRef As BlockReference = DirectCast(tr.GetObject(blkId, OpenMode.ForRead), BlockReference)
Dim btr As BlockTableRecord = DirectCast(tr.GetObject(blkRef.BlockTableRecord, OpenMode.ForRead), BlockTableRecord)
If btr.IsFromExternalReference Then
Instead of the message box, I want to get to the next step of picking up the attributes tho at that point btr is of External Reference type and doesn't contain any original block attributes (the Xref contains multiple blocks with multiple attributes so I need to drill down to this level).
Is there a way to turn btr to a certain type of object which is a collection of the blocks that the xref contains that I can cycle through?
so the code would be something like this (if possible?):
If btr.IsFromExternalReference Then
dim XrefBlockCollection as (some object array)
dim i as in int = 0
For Each id As ObjectId In XrefBlockCollection
Dim ad As AttributeDefinition = TryCast(tr.GetObject(id, OpenMode.ForRead), AttributeDefinition)
If ad IsNot Nothing Then
print( ad.tag & ad.textstring )
Much appreciated for all your time
<Runtime.CommandMethod("ADESK_scanXRefs")> _ Public Shared Sub ADESK_scanXRefs() Dim tMsgStr As String = "" Dim tAcadDoc As ApplicationServices.Document = Nothing Dim tDocLock As ApplicationServices.DocumentLock = Nothing Dim tTrAct As DatabaseServices.Transaction = Nothing Try tAcadDoc = ApplicationServices.Application.DocumentManager.Md
iActiveDocument tDocLock = tAcadDoc.LockDocument tTrAct = tAcadDoc.Database.TransactionManager.StartTransact ion tMsgStr &= "Start scan for References" & vbNewLine 'first get XRefs from list of Block-Definitions Dim tBlTab As DatabaseServices.BlockTable = CType(tTrAct.GetObject(tAcadDoc.Database.BlockTabl eId, DatabaseServices.OpenMode.ForRead), DatabaseServices.BlockTable) For Each tObjID In tBlTab If (tObjID.IsValid) AndAlso (Not tObjID.IsErased) Then Dim tBlTabRec As DatabaseServices.BlockTableRecord = CType(tTrAct.GetObject(tObjID, DatabaseServices.OpenMode.ForRead), DatabaseServices.BlockTableRecord) If tBlTabRec.IsFromExternalReference OrElse tBlTabRec.IsFromOverlayReference Then 'get database of XRef-file Dim tDB As DatabaseServices.Database = tBlTabRec.GetXrefDatabase(False) tMsgStr &= vbNewLine & vbNewLine & "XRef=" & tDB.Filename & vbNewLine 'then scan the XRef tMsgStr &= scanXRef(tDB) End If End If Next tMsgStr &= "Scan finished" Catch ex As Exception Finally If tTrAct IsNot Nothing Then tTrAct.Dispose() : tTrAct = Nothing If tDocLock IsNot Nothing Then tDocLock.Dispose() : tDocLock = Nothing End Try 'and now you have the result in the variable tMsgStr Debug.Print(tMsgStr) End Sub Private Shared Function scanXRef(ByRef DB As DatabaseServices.Database) As String Dim tRetStr As String = "" 'here the attribtues get listet Dim tTrAct As DatabaseServices.Transaction = Nothing Try tTrAct = DB.TransactionManager.StartTransaction() 'get modelspace Dim tBlTab As DatabaseServices.BlockTable = CType(tTrAct.GetObject(DB.BlockTableId, DatabaseServices.OpenMode.ForRead), DatabaseServices.BlockTable) Dim tBlTabRec As DatabaseServices.BlockTableRecord = CType(tTrAct.GetObject(tBlTab("*MODEL_SPACE"), DatabaseServices.OpenMode.ForRead), DatabaseServices.BlockTableRecord) 'now scan for blockreferences For Each tObjID As DatabaseServices.ObjectId In tBlTabRec If (tObjID.IsValid) AndAlso (Not tObjID.IsErased) AndAlso (tObjID.ObjectClass.DxfName = "INSERT") Then Dim tBlRef As DatabaseServices.BlockReference = CType(tTrAct.GetObject(tObjID, DatabaseServices.OpenMode.ForRead), DatabaseServices.BlockReference) If (tBlRef.AttributeCollection IsNot Nothing) AndAlso (tBlRef.AttributeCollection.Count > 0) Then 'ok, we have attributes within the blockreference For Each tAttID As DatabaseServices.ObjectId In tBlRef.AttributeCollection If (tAttID.IsValid) AndAlso (Not tAttID.IsErased) Then 'get the AttributeReference and prepare it for export Dim tAttRef As DatabaseServices.AttributeReference = CType(tTrAct.GetObject(tAttID, DatabaseServices.OpenMode.ForRead), DatabaseServices.AttributeReference) tRetStr &= "BLockHandle=&h" & Hex(tBlRef.Handle.Value) & " / TAG=" & tAttRef.Tag & " / VALUE=" & tAttRef.TextString & vbNewLine End If Next End If End If Next Catch ex As Exception tRetStr &= "Error in XRef: " & DB.Filename & ", msg: " & ex.Message & vbNewLine Finally If tTrAct IsNot Nothing Then tTrAct.Dispose() : tTrAct = Nothing End Try Return tRetStr End Function
>> Im sorry but I forgot to mention that I would be trying to achieve this in VB.net
for .NET-specific questions there is a special forum >>>here<<<
- alfred -
Wow that worked perfectly! ... Thanks so much for your help Alfred.
Sorry, didn't mean to post in the wrong section ... I was directed here from accidently posting another VB.net question in a general thread.
Is there anything I can add to:
Dim tDB As DatabaseServices.Database = tBlTabRec.GetXrefDatabase(True)
If the xref is no longer resolved? (the file no longer exists in which the xref is pointing to)
Because it errors out on the below line when it hits an Xref that is unresolved
Dim tDB As DatabaseServices.Database = tBlTabRec.GetXrefDatabase(False)
With the error message:
Object reference not set to an instance of an object.
Also is there a way I can pick up the constant attributes of the blocks in the Xref?
I tried adding in the code in which I use to target my active drawing below but was unsuccessfull, above this line of code in which you provided me:
If (tBlRef.AttributeCollection IsNot Nothing) AndAlso (tBlRef.AttributeCollection.Count > 0) Then
My constant attribute code:
For Each id As ObjectId In tBlTabRec
Dim ad As AttributeDefinition = TryCast(tTrAct.GetObject(id, OpenMode.ForRead), AttributeDefinition)
If ad IsNot Nothing Then
If ad.Constant = True Then
If ad.Tag.ToUpper = "CATEGORY" Then
I wish to check all the block's constant attributes before cycle through the attributecollection.
Much appreciated for the time you've spent.
>> Is there anything I can add to [...] If the xref is no longer resolved?
Yes, do a Try-Catch around it so it stays in the loop for scanning XRefs
>> Also is there a way I can pick up the constant attributes of the blocks in the Xref?
IMHO the code you provided (searching for constant AttributeDefinitions in the BlockTableRecord) is ok, do that before the check for the AttributeReferences in the AttributeCollection of the BlockReference. So that's 2 steps and ok.
Maybe this answers the question better: No you don't find constant attribtues in the AttributeCollection.
- alfred -
Is it possible to rebuild the code with a hashtable for the collected attribute-output instead of the string?
When I try to collect the attributes in a hashtable in the scanXref function it only works for just 1 xref.
Is het possible to merge hashtables from the different xrefs?
>> Is it possible to rebuild the code with a hashtable for the collected attribute-output instead of the string?
Yes, it is possible, just create a hashtable and add the values from the attribtute into it.
I don't understand the question, sorry.
>> When I try to collect the attributes in a hashtable in the scanXref function it only works for just 1 xref.
Then either create a key using the XRef-Name or make for each XRef a hashtable and create a new hashtable or collection and put the XRef-hashtable into it like a tree structure.
- alfred -
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