FIX: Memory Leak When Repeatedly Changing Toolbar Button Width

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0

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:

Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

Q171554 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 : kbVBp500 kbVS97sp2fix kbGrpVB kbvbp500sp2fix
Version : 5.0
Platform : WINDOWS
Issue type : kbbug