Knowledge Base

BUG: Error in CoolBar Event Can Cause Hanging or Exception

Article ID: 189632

Article Last Modified on 10/15/2002

APPLIES TO

Microsoft Visual Basic 5.0 Professional Edition
Microsoft Visual Basic 6.0 Professional Edition
Microsoft Visual Basic 5.0 Enterprise Edition
Microsoft Visual Basic 6.0 Enterprise Edition

This article was previously published under Q189632

SYMPTOMS

When using a CoolBar control, your compiled application hangs or generates an exception error or invalid page fault (IPF.)

CAUSE

An unhandled error occurred in one of the CoolBar's Events.

RESOLUTION

Handle the error with an On Error routine.

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

This problem only occurs in the compiled application and does not occur from the IDE. When an unhandled error occurs in one of the CoolBar's events, it hangs the application in Windows 95, but under Windows 2000, Windows NT 4, Windows 98, or Windows Me, it may produce an exception or IPF error.

Steps to Reproduce Behavior

Open a New Standard EXE project. Form1 is created by default.
Choose Components from the Project menu, check "Microsoft Windows Common Controls-3" and click OK.
Place a CoolBar control onto the form. CoolBar1 is created by default.

Place this code in the form's module:

      Private Sub CoolBar1_Click()
         Err.Raise 5
      End Sub

Choose Make exe from the File menu, and create an executable file.
Run the exe and click on the CoolBar control. (NOTE: You must click on one of the bars that separates the Bands rather than the Bands themselves.)

You should get a dialog for Run-time error '5': "Invalid procedure call or argument" and the application should end. Instead, the application will either hang or generate an exception error or IPF.

Replace the code in the CoolBar's Click Event with this code which contains an error handler:

      Private Sub CoolBar1_Click()
         On Error Goto CBErr
         Err.Raise 5
         Exit Sub
      CBErr:
         MsgBox "Error " & Err.Number & ": " & Err.Description
         Resume Next
      End Sub

Repeat steps 5 and 6. This time you will get an error message, after which the application continues running normally.

Additional query words: freeze lock GPF

Keywords: kbbug kbctrl kbpending KB189632

Microsoft KB Archive/189632

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