DOCUMENT:Q171516 11-JAN-2001 [vbwin] TITLE :FIX: ActiveX Document DLL Causes GPF When Unloading Modal Form PRODUCT :Microsoft Visual Basic for Windows PROD/VER:5.0 OPER/SYS: KEYWORDS:kbVBp500 kbVS97sp2fix kbGrpDSVB kbvbp500sp2fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Control Creation Edition for Windows, version 5.0 - Microsoft Visual Basic Learning Edition for Windows, version 5.0 - Microsoft Visual Basic Professional Edition for Windows, version 5.0 - Microsoft Visual Basic Enterprise Edition for Windows, version 5.0 ------------------------------------------------------------------------------- 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: Q170365 : 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: Q171554 : INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2 MORE INFORMATION ================ Steps to Reproduce Behavior --------------------------- 1. Start a new ActiveX Document DLL project. UserDocument1 is created by default. 2. Add a CommandButton (Command1) to UserDocument1. 3. Add the following code to the Click event of Command1: Private Sub Command1_Click() Dim x As New Form1 x.Show vbModal End Sub 4. Add a Form (Form1) to the project. 5. Add the following code to the Paint event of Form1: Private Sub Form_Paint() Unload Me End Sub 6. Press the F5 key to run the project. 7. Load the UserDocument1.vbd from the Visual Basic installation directory into Internet Explorer. 8. Click on Command1 button. Additional query words: kbDSupport ====================================================================== Keywords : kbVBp500 kbVS97sp2fix kbGrpDSVB kbvbp500sp2fix Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVBA500Search kbVBA500 kbVB500 kbZNotKeyword3 Version : 5.0 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.