DOCUMENT:Q295330 17-MAY-2002 [vbwin] TITLE :BUG: AV in MSVBVM60.dll Using WinInet .ocx in COM DLL PRODUCT :Microsoft Visual Basic for Windows PROD/VER::6.0,6.0 SP3,6.0 SP4,6.0 SP5 OPER/SYS: KEYWORDS:kbDLL kbDSupport ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Enterprise Edition for Windows, versions 6.0, 6.0 SP3, 6.0 SP4, 6.0 SP5 - Microsoft Windows Internet Services (WinInet) ------------------------------------------------------------------------------- SYMPTOMS ======== You may encounter an access violation if you unload a form that contains the WinInet ActiveX control when that form is hosted in a Visual Basic Component Object Model (COM) dynamic link library (DLL) rather than in the main project. CAUSE ===== Under certain conditions, destruction of the loaded WinInet control in a COM DLL may partially fail. The control creates a hidden window that is used for message handling. Although the control is successfully unloaded under all conditions, the hidden window may survive the destruction of the control. Because the window's callback function is destroyed when the control is unloaded, messages that are sent to the hidden window result in an access violation. RESOLUTION ========== A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to computers that are experiencing this specific problem. NOTE: You must have a Visual Studio license agreement to obtain this fix. To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS The English version of this fix should have the following file attributes or later: Date Time Version Size File name Platform ------------------------------------------------------------- 6.00.8877 Msinet.ocx STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. Additional query words: ====================================================================== Keywords : kbDLL kbDSupport Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVB600 kbVB600SP3 kbVB600SP4 kbVB600SP5 Version : :6.0,6.0 SP3,6.0 SP4,6.0 SP5 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbpending ============================================================================= 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 2002.