ACC97: TransferDatabase Causes Page Fault If Object Exists (160875)

SYMPTOMS

When you use TransferDatabase to copy an object to a target database, you may receive the following error message if the target database already contains the same type of object with the same name:

Object invalid or no longer set.

That message is followed by an invalid page fault which causes Microsoft Access to shut down:

MSACCESS caused an invalid page fault in module MSJET35.DLL

This article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to the "Building Applications with Microsoft Access 97" manual.

RESOLUTION

To work around the error, test for the existence of the object in the target database and delete it before you use TransferDatabase, as in the following example:

Create a copy of the sample database Northwind.mdb as Northwind2.mdb.
Open the sample database Northwind.mdb.

Create a module and type the following procedure:

Public Function TransferObject(Filename As String, _
                                     objType As Integer, _
                                     objName As String)
         On Error GoTo TransferObject_Err
         Dim accObj As New Access.Application
         accObj.OpenCurrentDatabase Filename
         accObj.DoCmd.DeleteObject objType, objName
         accObj.CloseCurrentDatabase
         Set accObj = Nothing
         DoCmd.TransferDatabase acExport, _
                                 "Microsoft Access", _
                                 Filename, _
                                 objType, objName, objName, False
         MsgBox "Transferred Object: " & objName & _
                " to database file " &  Filename, _
                vbInformation, "Test"
      TransferObject_End:
         Exit Function
      TransferObject_Err:
         MsgBox Err.Description, vbCritical, "Test"
         Resume TransferObject_End
      End Function

Save the module as TestXfer and close it.
To test this function, type the following line in the Debug window, and then press ENTER.

NOTE: Type the full path and file name for Northwind2.mdb as the first parameter in the following function.
```
?TransferObject("Northwind2.mdb", acForm, "Orders")
						
```
Note that when the transfer is complete, you receive the message:
Transferred Object: Orders to database file Northwind2.mdb

MORE INFORMATION

Steps to Reproduce Problem

Using a Visual Basic Procedure

WARNING: Following these steps will cause an invalid page fault on your computer. Make sure you save and close any open work on your computer before following these steps.

Create a copy of the sample database Northwind.mdb as Northwind2.mdb.
Open the sample database Northwind.mdb.

Create a module and type the following procedure.

NOTE: Type the full path and file name for Northwind2.mdb in the Database Name argument of the TransferDatabase method in this example.

      Function XferError()
         DoCmd.TransferDatabase acExport, "Microsoft Access", _
              "Northwind2.mdb", acForm, "Orders", "Orders", False
      End Function

Save the module as Module1 and close it.
To test this function, type the following line in the Debug window, and then press ENTER:
?XferError()
Note that you may have to execute the function twice to produce the invalid page fault error.

Using a Macro