read anonymous blocks

[Anonymous]

I have the follwoing error in C3D R2013.

Unable to cast object of type 'Autodesk.AutoCAD.DatabaseServices.BlockTableRecord' to type 'Autodesk.AutoCAD.DatabaseServices.BlockReference'.

When casting from a number, the value must be a number less than infinity

Make sure the source type is convertible to the destination type

My code is:

Imports System
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
Imports Autodesk.AutoCAD.EditorInput
Imports Autodesk.AutoCAD
Imports Autodesk.AutoCAD.ApplicationServices.Application
Imports Autodesk.AutoCAD.LayerManager
Imports Autodesk.AutoCAD.Windows
Imports Autodesk.AutoCAD.PlottingServices
Imports Autodesk.AutoCAD.Colors
Imports Autodesk.Civil.DatabaseServices
Imports Autodesk.Civil.ApplicationServices
Imports Autodesk.Civil.DatabaseServices.LabelGroup
Imports Autodesk.Civil.DatabaseServices.Styles.LabelSetStylesRoot
Imports Autodesk.Civil.Runtime
Imports Excel = Microsoft.Office.Interop.Excel
Imports Microsoft.VisualBasic.FileIO.FileSystem
Imports System.IO
Imports System.Convert
Imports Microsoft.VisualBasic.Strings
Imports System.Runtime.InteropServices
Imports System.Collections.Specialized

...

Using tr As Transaction = db.TransactionManager.StartTransaction()
            Dim btable As BlockTable = DirectCast(tr.GetObject(db.BlockTableId, OpenMode.ForRead), BlockTable)
            If btable.Has("vbredakdettek") Then
                Dim btr As BlockTableRecord = DirectCast(tr.GetObject(btable("vbredakdettek"), OpenMode.ForRead), BlockTableRecord)
                For Each refId As ObjectId In btr.GetAnonymousBlockIds()
                    myBlock = DirectCast(tr.GetObject(refId, OpenMode.ForRead), BlockReference)

...

[Alfred.NESWADBA]

Hi,

>> Unable to cast object of type 'Autodesk.AutoCAD.DatabaseServices.BlockTableRecord'

>> to type 'Autodesk.AutoCAD.DatabaseServices.BlockReference'.

I have not tried it, but I guess that the function .GetAnonymousBlockIds returns ObjectIDs of BlockTableRecords.

So change your last shown code line to:

      Dim myBlockBTR as BlockTableRecord = DirectCast(tr.GetObject(refId, OpenMode.ForRead), BlockTableRecord)

...does that work?

- alfred -

[Anonymous]

that works, but my code continues with:

            Using tr As Transaction = db.TransactionManager.StartTransaction()
                Dim btable As BlockTable = DirectCast(tr.GetObject(db.BlockTableId, OpenMode.ForRead), BlockTable)
                If btable.Has("vbredakdettek") Then
                    Dim btr As BlockTableRecord = DirectCast(tr.GetObject(btable("vbredakdettek"), OpenMode.ForRead), BlockTableRecord)
                For Each refId As ObjectId In btr.GetAnonymousBlockIds()
                    Dim myBlockBTR As BlockTableRecord = DirectCast(tr.GetObject(refId, OpenMode.ForRead), BlockTableRecord)
                    'myBlock = DirectCast(tr.GetObject(refId, OpenMode.ForRead), BlockReference)


                    Dim owner As BlockTableRecord = DirectCast(tr.GetObject(myBlock.OwnerId, OpenMode.ForRead), BlockTableRecord)
                    If owner.IsLayout Then
                        If myBlock.Name.ToUpper = "VBREDAKDETTEK" Then

 How can I then get "myblock" ?

[Alfred.NESWADBA]

Hi,

use the function myBlockBTR.GetBlockReferenceIDs to get the ObjectIDs pointing to the blockreferences then.

- alfred -