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Microsoft KB Archive/171505

From BetaArchive Wiki

Article ID: 171505

Article Last Modified on 12/10/2003



APPLIES TO

  • Microsoft Visual Basic 5.0 Control Creation Edition
  • Microsoft Visual Basic 5.0 Learning Edition
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition



This article was previously published under Q171505

SYMPTOMS

While running in debug mode, Visual Basic may disappear or generate an Illegal Page Fault (IPF) error message when the "End" Toolbar item is pressed.

CAUSE

Visual Basic encounters an unhandled exception and terminates.

RESOLUTION

Upgrade to Visual Studio 97 Service Pack 2 (SP2).

-or-



Avoid stopping program execution inside events.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Studio 97 Service Pack 2.

For more information on the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

170365 : INFO: Visual Studio 97 Service Packs - What, Where, and Why



For a list of the Visual Basic 5.0 bugs that were fixed in the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

171554 : INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2


MORE INFORMATION

Steps to Reproduce Behavior

  1. Create a Standard EXE project with 3 forms (Form1, Form2, and Form3).
  2. Place one CommandButton on both Form1 and Form2.
  3. Place the following code in the Command1_click event on Form1:

          Form2.show vbModal
    
                            
  4. Place the following code in the Command1_click event on Form2:

          Form3.show vbModal
    
                            
  5. Add the following code to the Form3_load event:

          Dim a, b
          Debug.print "Loading Form"
    
                            
  6. Add the following to the Form3_Unload event:

          Debug.print "Unloading Form"
    
                            
  7. Press the F5 key to start execution.
  8. Press CTRL+BREAK to enter debug mode.
  9. In the Immediate Window (CTRL+G), enter "Command1_click" (without the quotes) to activate the Command1_click event.
  10. Press CTRL+BREAK to enter debug mode.
  11. Press the F8 key to Begin Stepping through code.
  12. Click the Command1 button on Form 2.
  13. Press the F8 key to step into load event of Form3.
  14. When you reach the Debug.print line (before executing this line), stop program execution.

    At this point, Visual Basic will appear to continue running the program. Click the End button again. The Visual Basic IDE will disappear or Visual Basic will generate an Invalid Page Fault(IPF) error message.



Additional query words: kbDSupport

Keywords: kbbug kbfix kbvbp500sp2fix kbvs97sp2fix KB171505