DOCUMENT:Q183162  30-MAR-1998  [vbwin]
TITLE   :BUG: VB Crashes After Ending Application While in Break Mode
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:5.0
OPER/SYS:WINDOWS
KEYWORDS:vb5all VBKBDebug kberrmsg

======================================================================
---------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Visual Basic Learning, Professional, and Enterprise Editions
   for Windows, version 5.0
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SYMPTOMS
========

While debugging your application in Break mode, Visual Basic may terminate,
hang, or cause one or both of the following errors when you end the
application:

   Run-time error '28': Out of stack space

   -or-

   VB5 caused a stack fault in module KERNEL32.DLL at 0137:bff725c5.

CAUSE
=====

This problem can occur when multiple forms are shown modally. The problem
only occurs at design-time when you use the Immediate Window while in Break
mode and then end the application.

RESOLUTION
==========

One workaround for this problem is to avoid using the Immediate Window
while your forms are shown modal or to show your forms modeless instead of
modal. You can show a form modeless yet simulate most of the functionality
of showing a form modal by setting the form's ShowInTaskbar property to
False and by setting the Enabled property of the other visible forms to
False, which prevents users from setting focus to the other forms. When the
user dismisses the form, reset the Enabled property of the other visible
forms as appropriate.

STATUS
======

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

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

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

1. Create a new Standard EXE project. Form1 is created by default.

2. Put a CommandButton on Form1.

3. Add the following code to Form1:

      Private Sub Command1_Click()
         Dim frm as Form1
         Set frm = New Form1
         frm.Show vbModal 'problem does not occur when showing
                          'forms modeless: frm.Show vbModeless
      End Sub

4. Run the project. Press enter 29 times to load 30 forms. (Each time you
   press Enter, the Command1_Click code shows a modal copy of Form1.)

5. Press the CTRL+BREAK keys to enter Break mode.

6. Press the CTRL+G keys to view the Immediate Window, and then type:

      ? "Hello"

7. End the project by clicking the END button on the toolbar. Note
   Visual Basic hangs or terminates as described previously.

Additional query words: access violation illegal operation page fault ipf
gpf
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Keywords          : vb5all VBKBDebug kberrmsg
Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbbug

=============================================================================

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Copyright Microsoft Corporation 1998.