DOCUMENT:Q171209  10-JUL-1997  [vbwin]
TITLE   :BUG: Popup Menus May Cause Application Error in IDE
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:5.0
OPER/SYS:WINDOWS
KEYWORDS:kberrmsg vb5all

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

 - Microsoft Visual Basic Control Creation, Learning, Professional, and
   Enterprise Editions for Windows, version 5.0
---------------------------------------------------------------------

SYMPTOMS
========

When working in the Microsoft Visual Basic 5.0 IDE, you may receive the
following message:

   "Application Error:

   The instruction at "0x0f019262" references memory at "0x00000000".
   The memory could not be "read."

This occurs when testing applications in the Visual Basic 5.0 IDE that pass
menus to custom ActiveX controls.

RESOLUTION
==========

The error does not occur once the container application is compiled.

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. In a new ActiveX Control project, add the following code to the
   control:

      Option Explicit

      Dim oMnu As Object
      Private Sub UserControl_MouseDown _
          (Button As Integer, Shift As Integer, X As Single, Y As Single)
          Select Case Button
          Case vbRightButton
              If Not oMnu Is Nothing Then
                  PopupMenu oMnu
              End If
          End Select
      End Sub

      Public Sub newMenu(mnu As Object)
          Set oMnu = mnu
      End Sub

2. Name the control "PopupMenuCtl."

3. Name the control project by clicking Project Properties from the
   Project menu. Set the Project Name field to "TestControl" (without
   the quotes).


4. Save the project and compile the control.

5. In a new Standard EXE project, add the control to the project by
   clicking Component from the Project menu and turn on the option for
   the new control called "TestControl."

6. In Form1, draw an instance of TestControl.

7. Add a menu to the form by displaying the form and selecting Menu
   Editor from the Tools menu. Add the following menus:

   Indent       Caption         Name

   none         "&File"         "FileMenu"
   1            "&Test"         "FileMenuTest"

8. Add the following code to Form1:

      Option Explicit

      Private Sub Form_Load()
         PopupMenuCtl1.newMenu FileMenu
      End Sub

9. In the Visual Basic IDE, press the F5 key to bring up Form1.

10. Right-click in the area occupied by the ActiveX control.
======================================================================
Keywords            : kberrmsg vb5all
Version             : 5.0
Platform            : WINDOWS
Issue type          : kbbug

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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1997.