topic Re: read anonymous blocks in Civil 3D Customization Forum

read anonymous blocks

Anonymous — Tue, 23 Oct 2012 10:54:31 GMT

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)

...

Re: read anonymous blocks

Alfred.NESWADBA — Tue, 23 Oct 2012 11:01:36 GMT

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 -

Re: read anonymous blocks

Anonymous — Tue, 23 Oct 2012 12:53:29 GMT

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" ?

Re: read anonymous blocks

Alfred.NESWADBA — Tue, 23 Oct 2012 15:42:39 GMT

Hi,

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

- alfred -