DOCUMENT:Q257421 26-JUL-2001 [vbwin] TITLE :FIX: Compiling ActiveX Project Does Not Release Reference Right PRODUCT :Microsoft Visual Basic for Windows PROD/VER:WINDOWS:6.0 OPER/SYS: KEYWORDS:kbActiveX kbCOMt kbCtrl kbCtrlCreate kbVBp kbVBp600bug kbGrpDSVB kbDSupport kbVS600sp4f ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Professional Edition for Windows, version 6.0 - Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 ------------------------------------------------------------------------------- SYMPTOMS ======== After compiling a Visual Basic 6.0 ActiveX Control that uses an MFC ActiveX Control, you receive the following error message when you exit Visual Basic: Debug Assertion Failed! Program: C:\PROGRAM FILES\MICROSOFT VISUAL STUDIO\VB98\VB6.EXE File: cmdtarg.cpp Line: 52 For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts. (Press Retry to debug the application) CAUSE ===== The problem occurs when the reference to IClassFactory2 is not released by Visual Basic. STATUS ====== Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This bug was corrected in the latest service pack for Visual Studio 6.0. For additional information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base: Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why Q194295 HOWTO: Tell That a Visual Studio Service Pack Is Installed To download the latest Visual Studio service pack, visit the following Microsoft Web site: http://msdn.microsoft.com/vstudio/downloads/updates.asp MORE INFORMATION ================ Steps to Reproduce Behavior --------------------------- Create an MFC Control: 1. Start Microsoft Visual C++. 2. On the File menu, select New. 3. Select the Project tab and choose MFC ActiveX ControlWizard. 4. Enter the project name and click OK. 5. Use all of the project defaults. 6. Select Build .ocx from the Build menu or press the F7 key. Use an MFC Control in a Visual Basic ActiveX Control Project: 1. Start a new ActiveX Control project in Visual Basic. UserControl1 is created by default. 2. On the Project menu, select Components, or right-click on the Toolbox and select Components. 3. On the Components dialog box, check the MFC control that you just created, and then click OK. 4. Add the MFC control to the UserControl. 5. On the File menu, select Make Project1.ocx. 6. After compiling the project, close Visual Basic and note that the error occurs. Additional query words: sp4 ====================================================================== Keywords : kbActiveX kbCOMt kbCtrl kbCtrlCreate kbVBp kbVBp600bug kbGrpDSVB kbDSupport kbVS600sp4fix kbVS600sp5fix Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVB600 Version : WINDOWS:6.0 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.