ACC95: DateDiff, DateAdd, or DatePart Causes IPF in VBA232.DLL

• Microsoft Access 7.0

SYMPTOMS

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

When you pass an uninitialized string variable to the interval argument of the DateAdd(), DatePart(), or DateDiff() functions in Microsoft Access 7.0, you receive the following error message:

   MSACCESS caused an invalid page fault in module VBA232.DLL

RESOLUTION

Always pass a valid interval value to the DateAdd(), DatePart(), and DateDiff() functions. To be sure you pass a valid interval value, you can test for the value of the variable before you invoke the function, as in the following example:

   Sub IntervalTest()
      Dim x as String
      If x <> "" Then
         Debug.Print DateAdd(x,1,Date)
      Else
         MsgBox "The interval argument is invalid."
      End If
   End Sub

   Sub IntervalTest()
      Dim x as String
      x = ""
      ' Add other code here that sets the value of x
      Debug.Print DateAdd(x,1,Date)
   End Sub

   Run-time error '5':
   Invalid procedure call

STATUS

Microsoft has confirmed this to be a problem in Microsoft Access 7.0. This behavior does not occur in Microsoft Access 2.0 or 97.

MORE INFORMATION

Steps to Reproduce Problem

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

1. Start Microsoft Access 7.0 and open the sample database Northwind.mdb.

2. Create a module and type the following procedure:

         Sub Test()
            Dim x as String
            Debug.Print DateAdd(x,1,Date)
         End Sub
   
   

3. To test this procedure, type the following line in the Debug window, and then press ENTER.

          Test
   

   Note that you receive the error message.

   NOTE: You may receive an "Out of Stack Space" run-time error, instead of a page fault, the first time you run this procedure. However, subsequent execution of the procedure results in a page fault error.

REFERENCES