BUG: Wrapped CoolBar Control May GPF Client EXE Program

ID: Q189914

The information in this article applies to:

Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 6.0
Microsoft Visual Basic Professional and Enterprise Editions for Windows, version 5.0

SYMPTOMS

When you wrap the CoolBar control inside a Visual Basic ActiveX Control, your Visual Basic client EXE may gave an Illegal Operation error when it shuts down. This occurs only on Windows 95/98, and when the CoolBar control has child controls in a band. You will get the following error only in a compiled EXE and not in the Visual Basic IDE:

"This program has performed an illegal operation and will be shut down"

RESOLUTION

Clear all the bands from the CoolBar control before the client EXE shuts down. See Steps to Reproduce Behavior below for an example.

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

To reproduce this behavior you must build an OCX that wraps the CoolBar control and a client EXE that uses that OCX. The EXE must be run on Windows 95/98. The EXE will not give the above error running on NT 4.0.

Steps to Reproduce Behavior

Create a new ActiveX Control Project.

Using the Projects menu, select Components to bring up the Components dialog box. On the Controls Tab, check "Microsoft Windows Common Controls-3." Click OK to close the Components window.

Place a CoolBar on the UserControl.

Change the name of the UserControl to "ctlCoolBar", and the project name to pjxCoolBar.

Place a TextBox, CommandButton, and ComboBox on the CoolBar control.

Alternate mouse click on the CoolBar and select Properties from the pop-up menu.

On the Property Pages dialog box, select the Bands tab.

For Index 1, set the Child property to Text1; for Index 2, set the Child property to Command1; for Index 3, set the Child property to Combo1.

Add the following code to the UserControl:


      Public Sub ClearBands()
         ' clearing all the bands before the control terminates
         ' will keep the client EXE from having the Illegal Operation
         ' error when it shuts down
         CoolBar1.Bands.Clear
      End Sub

From the File menu, Save the project, and Make pjxCoolBar.OCX.

Create a new Standard EXE Project. Form1 is created by default.

Using the Projects menu, select Components to bring up the Components dialog box. On the Controls tab, check PjxCoolBar. Click OK to close the dialog window.

Place the ctlCoolBar control on Form1.

From the File menu, Save the project, and Make project1.exe.

Run project1.exe and then shutdown project1.exe. You will get the Illegal Operation error.

To work around the error, add the following code to the Form's QueryUnload event.
```
      ctlCoolBar1.ClearBands 
```

Repeat steps 14 and 15. You will not get the error when you shut down project1.exe.

Additional query words: kbDSupport kbDSD kbCtrl kbVBp kbVBp600bug kbVBp500bug

Keywords : kbGrpVB
Version : WINDOWS:5.0
Platform : WINDOWS
Issue type : kbbug