ACC97: TransferDatabase Causes Page Fault If Object Exists

• Microsoft Access 97

SYMPTOMS

Moderate: Requires basic macro, coding, and interoperability skills.

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.

   MSACCESS caused an invalid page fault in module MSJET35.DLL

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:

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

2. Open the sample database Northwind.mdb.

3. 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
   
   

4. Save the module as TestXfer and close it.

5. 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
   

STATUS

Microsoft has confirmed this to be a problem in Microsoft Access 97. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

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.

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

2. Open the sample database Northwind.mdb.

3. 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
   
   

4. Save the module as Module1 and close it.

5. To test this function, type the following line in the Debug window, and then press ENTER:

         ?XferError()
   

   Note that you may need to execute the function twice to produce invalid page fault error.

Using a Macro

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.

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

2. Open the sample database Northwind.mdb.

3. Create the following new macro.

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

         Macro: XferError       Action
         --------------------------------------
                               TransferDatabase
   
         XferError Actions
         ----------------------------------
         TransferDatabase
            Transfer Type: Export
            Database Type: Microsoft Access
            Database Name: Northwind2.mdb
            Object Type: Form
            Source: Orders
            Destination: Orders
            Structure Only: No
   
   

4. Save the XferError macro and close it.

5. Run the macro. You may need to run the macro twice to produce the following error message:

         Object Invalid or no longer set.
   

   When you click OK in response to the error message, you receive the invalid page fault error.

REFERENCES

For more information about TransferDatabase, search the Help Index for "TransferDatabase method" or "TransferDatabase action," or ask the Microsoft Access 97 Office Assistant.