XL97: Error Appears When CopyFromRecordSet Uses Empty Variable

• Microsoft Excel 97 for Windows

SYMPTOMS

In Microsoft Excel 97, if you run a Visual Basic for Applications macro that uses the Data Access Objects (DAO) CopyFromRecordSet method to retrieve data from an external database, you may receive the following error message:

This program has performed an illegal operation and will be shut down. If the problem persists, contact the program vendor.

EXCEL caused an invalid page fault in module EXCEL.EXE at 0137:30459362.

CAUSE

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact the Microsoft fee-based consulting line at (800) 936-5200. For more information about the support options available from Microsoft, please see the following page on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

Variable Is Uninitialized

Sub Test1()

       Dim X As Object, D As Database, R As Object
       Set D = OpenDatabase("C:\Northwind.mdb")
       Set R = D.OpenRecordset("SELECT * FROM Customers WHERE " & _
           "Country = 'None';")

       ' Variable X is uninitialized.
       ThisWorkbook.Sheets(1).Cells(1, 1).CopyFromRecordset X

   End Sub 

Variable Is Set to Nothing

    Sub Test2()
       Dim D As Database, R As Object
       Set D = OpenDatabase("C:\Northwind.mdb")
       Set R = Nothing

       'Variable R is set to Nothing.
       ThisWorkbook.Sheets(1).Cells(1, 1).CopyFromRecordset R

   End Sub 

WORKAROUND

To work around this problem, make sure that the TypeName function of the Data variable is set to a value other than Nothing. To do this, modify the code so that it resembles the following:

     ' If R is not Nothing and is not uninitialized, then...
   If TypeName(R) <> "Nothing" Then

       '...copy the recordset into Sheet1, cell A1.
       ThisWorkbook.Sheets(1).Cells(1, 1).CopyFromRecordSet R

   End If 

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

In Microsoft Excel, you use the CopyFromRecordSet method to copy the contents of a recordset object into a worksheet.

If the OpenRecordSet method returns a recordset that contains no data (for example, you used a query that returns no records), the problem described in this article does not occur, and no data is returned to the worksheet. The problem occurs only when the Data argument refers to a variable that does not contain a recordset.

Additional query words: XL97 ipf

Keywords : kbprg kbdta kbdtacode xldao KbVBA
Version : WINDOWS:97
Platform : WINDOWS
Issue type : kbbug