Microsoft KB Archive/171516

= FIX: ActiveX Document DLL Causes GPF When Unloading Modal Form =

Article ID: 171516

Article Last Modified on 12/10/2003

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APPLIES TO


 * Microsoft Visual Basic 5.0 Control Creation Edition
 * 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 Q171516



SYMPTOMS
A General Protection Fault (GPF) occurs in Internet Explorer when using ActiveX UserDocument DLL.



CAUSE
This behavior occurs when you attempt to unload a form within the Paint Event.



RESOLUTION
This problem has been fixed in SP2. Visual Basic now catches the error and posts an error message stating that the form can not be unloaded in this context.



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



Steps to Reproduce Behavior
 Start a new ActiveX Document DLL project. UserDocument1 is created by default. Add a CommandButton (Command1) to UserDocument1.  Add the following code to the Click event of Command1: Private Sub Command1_Click Dim x As New Form1 x.Show vbModal End Sub

 Add a Form (Form1) to the project.  Add the following code to the Paint event of Form1: Private Sub Form_Paint Unload Me     End Sub

</li> Press the F5 key to run the project.</li> Load the UserDocument1.vbd from the Visual Basic installation directory into Internet Explorer.</li> Click on Command1 button.</li></ol>

Additional query words: kbDSupport

Keywords: kbbug kbfix kbvbp500sp2fix kbvs97sp2fix KB171516

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