Microsoft KB Archive/181064

= WD98: Converted WordBasic On Error Statements May Fail =

Article ID: 181064

Article Last Modified on 6/17/2005

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APPLIES TO


 * Microsoft Word 98 for Macintosh

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This article was previously published under Q181064



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
Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers 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 requirements. By design, the On Error statement in Visual Basic works differently from WordBasic. In Visual Basic, On Error is not cleared when an error occurs, while in WordBasic, the On Error statement is cleared, the error trap is reset, and your code continues to run.

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 In this example, the Err.Raise statement artificially raises an error for demonstration purposes. When the error occurs and the next iteration of the loop occurs, the "On Error GoTo -1" statement clears the error trap and the "On Error GoTo ErrorTrap" statement resets the error trap. The loop continues to process without interruption until it completes the designated number of iterations (10).



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.

