WD97: Converted WordBasic On Error Statements May Fail

• Microsoft Word 97 for Windows

SYMPTOMS

When you run a Microsoft Visual Basic for Applications procedure or macro that was converted from a WordBasic procedure or macro that contained error trapping, the error trap is ignored though it worked as expected when run in WordBasic.

CAUSE

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Therefore, the following sample converted WordBasic code fails when an error occurs the second time.

   Sub Main()
      ' Clear error trap. Set error trap.
      On Error GoTo -1: On Error GoTo ErrorTrap
      ' Loop 10 times.
      For i = 1 To 10
         ' Artificially raise an error.
         Err.Raise 5
   ErrorTrap:
        ' Decision tree based on error returned.
        If Err.Number = 0 Then
            ' If no error occurred, do this...
            count_ = count_ + 1
        Else
            ' Else, if error occurred, do this...
            Err.Number = 0
        End If
      Next
   End Sub

RESOLUTION

To resolve this issue, make the On Error statement the first statement inside the loop.

   Sub Main()
      ' Loop 10 times.
      For i = 1 To 10
      ' Clear error trap. Set error trap.
      On Error GoTo -1: On Error GoTo ErrorTrap
         ' Artificially raise an error.
         Err.Raise 5
   ErrorTrap:
        ' Decision tree based on error returned.
        If Err.Number = 0 Then
            ' If no error occurred, do this...
            count_ = count_ + 1
        Else
            ' Else if error occurred, do this...
            Err.Number = 0
        End If
      Next
   End Sub

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

REFERENCES

For more information about the On Error Statement, click the Office Assistant in the Visual Basic Editor, type "On Error," click Search, and then click to view "On Error Statement."

NOTE: If the Assistant is hidden, click the Office Assistant button on the Standard toolbar. If Word Help is not installed on your computer, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q120802
   TITLE     : Office: How to Add/Remove a Single Office
               Program or Component 

   ARTICLE-ID: Q163435
   TITLE     : VBA: Programming Resources for Visual Basic for
               Applications