KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q168554: FIX: Resource Drain with PictureBox on Form

Article: Q168554
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:5.0
Operating System(s): 
Keyword(s): kbVBp kbVBp500bug kbVS97sp1fix kbGrpDSVB kbDSupport kbControl
Last Modified: 11-JAN-2001

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

- Microsoft Visual Basic Control Creation Edition for Windows, version 5.0 
- Microsoft Visual Basic Enterprise Edition for Windows, version 5.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

In Visual Basic 5.0 running under Windows 95 or Windows 98, setting the
Appearance property of a PictureBox to 0-Flat causes resources to be lost each
time the form is unloaded. If the Appearance Property is set to 1-3D, resources
are not lost.

This occurs with a PictureBox placed either directly on a form or on a
UserControl that is placed on the form.

RESOLUTION
==========

Set the appearance property to 1-3D or use a different container, such as an
Image control or UserControl, depending on your application.

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 the Visual Studio 97
Service Pack 1.


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

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

1. Place a PictureBox on a Form1 in a new project in Visual Basic 5.0.

2. Set the Appearance property of the PictureBox to 0-Flat.

3. Add a Module to your project and add the following code to it:

        SUB Main
          DIM i as Integer

          FOR i = 1 TO 1000
            Form1.Show
            DoEvents
            Unload Form1
            DoEvents
          Next i

        END SUB

4. Set the Startup Object of your project to Sub Main.

5. Run the application while monitoring resources with a tool such as the
  Windows 95 Resource Meter.

6. As the form is loaded and unloaded repeatedly, GDI resources will diminish.

Additional query words:

======================================================================
Keywords          : kbVBp kbVBp500bug kbVS97sp1fix kbGrpDSVB kbDSupport kbControl 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVBA500Search kbVBA500 kbVB500 kbZNotKeyword3
Version           : WINDOWS:5.0
Issue type        : kbbug
Solution Type     : kbfix

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

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.