Q193036: BUG: "On Error Resume Next" Enters Infinite Loop in Native Code

Article: Q193036
Product(s): Microsoft Visual Basic for Windows
Version(s): 5.0,6.0
Operating System(s): 
Keyword(s): kbCompiler kbVBp kbVBp500bug kbVBp600bug kbOSWin95 kbOSWin98 kbGrpDSVB kbDSupport kbOSW
Last Modified: 27-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, versions 5.0, 6.0 
- Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0 
- Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 
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SYMPTOMS
========

After compiling to native code, a Visual Basic application using "On Error
Resume Next" together with a For loop may sometimes enter an infinite loop when
running as a standalone executable.

RESOLUTION
==========

To work around this behavior, the code can be restructured. The code provided
below resolves the problem for the code that reproduces this bug in the "Steps
To Reproduce Behavior" section of this article:

     Public Sub Form_Load()
        On Error Resume Next
        Dim x As Integer
        Dim z as integer
        Dim mArray as Variant
        z = UBound(mArray)
           For x = 0 To z
              MsgBox "clear"
           Next x
     End Sub

STATUS
======

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

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Create a standard EXE project in Visual Basic. Form1 is created by default.

2. Paste the following code into Form1:

        Public Sub Form_Load()
           On Error Resume Next
           Dim x As Integer
           Dim mArray as Variant
           For x = 0 To UBound(mArray)
              MsgBox "Test"
           Next x
        End Sub

3. Select Properties from the Project menu. Under the Compile tab, select
  Compile to Native Code

4. Run the project by pressing the F5 key. Note that the message box displays
  only once.

5. Select Make Project1.exe to compile the project.

6. Run the compiled executable.

  Instead of displaying one message box, an endless number message boxes are
  displayed.

  On Windows NT or Windows 2000, you can end this application through the Task
  Manager using the End Task button.

  On Win95/98/Me, press the CTRL+ALT+DEL key combination and select the program.
  Press the End Task button to close the application.

Additional query words:

======================================================================
Keywords          : kbCompiler kbVBp kbVBp500bug kbVBp600bug kbOSWin95 kbOSWin98 kbGrpDSVB kbDSupport kbOSWinME 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVBA500 kbVBA600 kbVB500 kbVB600
Version           : :5.0,6.0
Issue type        : kbbug
Solution Type     : kbpending

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