topic Re: Problem with ObjectData (VB.Net) in AutoCAD Map 3D Developer Forum

Problem with ObjectData (VB.Net)

Anonymous — Fri, 14 Jan 2011 21:00:30 GMT

I'm having a problem with ObjectData.

-- See code below for reference --

I'm calling the function attachODAndSetValue several times through a For statement (For each id in ObjectIDList).

Eventually, I alway get the following error:

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

The error always refer to the following line of my code: table.AddRecord(rec, id)

Before calling attachODAndSetValue, I make sure that the ObjectID passed to the function is valid (I check if id.isValid = True).

Did some of you had this kind of problem with ObjectData? Did you find a solution?

I'm using AutoCAD MAP 3D 2010 64bits on Windows 7

Thanks

Louis

Public Function attachODAndSetValue(ByVal tableName As String, ByVal id As ObjectId, ByVal dataCol As Collection) As Integer

'tableName : ObjectData Table to attach to the Object

'id : objectId of the element to which I want to attach the ObjectData

'dataCol : data to write in the ObjectData

Dim errStatus As Integer = 0

Dim rec As Record = Nothing

Try

            Dim mapApp As Autodesk.Gis.Map.MapApplication = Autodesk.Gis.Map.HostMapApplicationServices.Application
            Dim activeProject As Project.ProjectModel = mapApp.ActiveProject
            Dim tableList As Tables = activeProject.ODTables

If tableList.IsTableDefined(tableName) = False Then
'table does not exist, exit try

                errStatus = 2
                Exit Try
            End If

Dim table As ObjectData.Table = tableList.Item(tableName)

'Create and Initialize the record

rec = ObjectData.Record.Create
table.InitRecord(rec)

            If rec.Count = dataCol.Count Then
                Dim i As Integer
                For i = 0 To rec.Count - 1
                    'Assign the value
                    rec.Item(i).Assign(dataCol.Item(i + 1))
                Next
            Else
                errStatus = 3
                Exit Try
            End If

table.AddRecord(rec, id) 'Program crashed here

errStatus = 0

        Catch err As MapException
            MessageBox.Show("Error:" & vbNewLine & err.Message & vbNewLine & vbNewLine & err.ToString)
            errStatus = 1
        Finally
            If rec IsNot Nothing Then
                rec.Dispose()
            End If
        End Try

Return errStatus
End Function

Re: Problem with ObjectData (VB.Net)

fieldguy — Fri, 14 Jan 2011 23:04:50 GMT

Have you downloaded the Map ObjectARX SDK 2011? In the Docs folder, the sdk.arx.net.dev.chm file has a section on Object Data and Attaching. Quoting the doc:

"Each Item property in the record is of type Utilities.MapValue, which is a general-purpose class for storing data of variant types. To set any field, get a reference to the field from the Record object using the Item property. Assign the value with MapValue.Assign()."

Have you checked your datacol.item(i+1)? Does it exist? Is it valid for the field type (rec.item(i))?

Re: Problem with ObjectData (VB.Net)

Anonymous — Tue, 18 Jan 2011 16:35:16 GMT

Yes, the data type is OK

The problem occurs occasionally (8 out of 10 times).

Sometimes the program works, sometimes it doesn't.

The only way I found to make it work was to call the GarbageCollector at the end of attachODAndSetValue or to dispose of tableList, activeProject and mapApp. This make the program super SLOOWWW.

I also tried to create tableList, activeProject and mapApp outside attachODAndSetValue and pass tableList as an argument and it still doesn't work.

What is annoying is that program has been working perfectly for 4-5 years on an old P4 3GHz. When we got à new i7 940, last year, I started to have occasional problems. We just migrated to 64 bits and I can't make it run anymore...

I made a counter to display in which of the loop of the for that the program crashed... It's usually around the 400th loop (out of 1700).

Re: Problem with ObjectData (VB.Net)

Anonymous — Wed, 31 Aug 2011 17:13:42 GMT

Hello, I'm having the same problem when adding records ObjectData, also decided in the function call GC.Collect (), I use 64-bit AutoCAD MAP 2012, but this solution Deich preventing the application very slow work.
Can you help me solve this problem please?

Re: Problem with ObjectData (VB.Net)

Anonymous — Thu, 01 Sep 2011 13:13:39 GMT

Here is how I corrected to problem.

I added a parameter to the function : ODTableList as ObjectData.Tables.

I initialise this variable in the sub calling attachDefaultODAndSetValue

I had to do this modification to every single function using ObjectData but it's been working perfectly since.

Here is an example:

The sub calling attachODAndSetValue

Public Sub button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttton.Click

Dim ODtableList As ObjectData.tables = Autodesk.Gis.Map.HostMapApplicationServices.Application.ActiveProject.ODTables

Dim myODTable As string = "myODTable"

Dim id As ObjectID

'set a value to id

'...

Dim odCol As new Collection

'Add data to odCol

'...

attachODAndSetValue(ODtableList, myODTable, id, odCol))

End Sub

New version of attachODAndSetValue

PublicFunction attachODAndSetValue(ByVal ODTablesList As ObjectData.Tables, ByVal tableName AsString, ByVal id As ObjectId, ByVal dataCol As Collection) AsInteger

Dim errStatus AsInteger = 0

Dim rec As Record = Nothing

Try

If ODTablesList.IsTableDefined(tableName) = FalseThen

errStatus = 2

ExitTry

EndIf

Dim table As ObjectData.Table = ODTablesList.Item(tableName)

rec = ObjectData.Record.Create

table.InitRecord(rec)

If rec.Count = dataCol.Count Then

Dim i AsInteger

For i = 0 To rec.Count - 1

rec.Item(i).Assign(dataCol.Item(i + 1))

Else

errStatus = 3

ExitTry

EndIf

table.AddRecord(rec, id)

table.Dispose()

errStatus = 0

Catch err As MapException

MessageBox.Show("Errorr:" & vbNewLine & err.Message)

errStatus = 1

Finally

If rec IsNotNothingThen

rec.Dispose()

EndIf

EndTry

Return errStatus

EndFunction