Microsoft KB Archive/171821

Knowledge Base

FIX: Memory Leak When Repeatedly Changing Toolbar Button Width

Article ID: 171821

Article Last Modified on 11/18/2003

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APPLIES TO

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

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This article was previously published under Q171821

SYMPTOMS

When repeatedly changing the Width of one or more Toolbar Buttons at run- time, you may experience a degradation in performance and/or a resource leak that is not replenished until your application ends.

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. Open a new "Standard EXE" project.
2. Click Components on the Project menu. Check "Microsoft Windows Common Controls 5.0".
3. Add an ImageList control, a ToolBar control and a CommandButton to Form1.
4. In the Custom property page for ImageList1, click the Images tab and insert one picture. Click OK.
5. In the Custom property page for Toolbar1, set the Imagelist property to "ImageList1." Insert one button and set the Image property to 1. Insert another button and set the style to 4-tbrPlaceholder. Click OK.

6. Add the following code to the Click event of Command1.

         For i = 1 To 100
              Toolbar1.Buttons(2).Width = 500
              Debug.Print i
              DoEvents
            Next
                           

7. Click Immediate Window on the View menu.
8. Press the F5 key to run the application.
9. Click Command1. Notice that performance degrades after each iteration of changing the width of the Button Placeholder.

Additional query words: memory leak comctl32.ocx tool bar

Keywords: kbbug kbfix kbvbp500sp2fix kbvs97sp2fix KB171821

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