FIX: Closing an ActiveX Control Project Crashes DevStudio

ID: Q157893

The information in this article applies to:

The Microsoft Foundation Classes (MFC), included with:
- Microsoft Visual C++, 32-bit Editions, version 4.2

SYMPTOMS

When opening or closing a project in Developer Studio, you may see an access violation with the following error message:


   [ASCII 147]MSDEV CAUSED AN INVALID PAGE FAULT IN MODULE
     MSVCRES.DLL at   0137:503126ba.[ASCII 148]

This behavior occurs if the Properties window for a ControlWizard- generated ActiveX Control is invoked in the dialog editor.

CAUSE

This is due to a bug in the MFC 4.2 libraries.

RESOLUTION

To obtain this patch, please refer to the following article in the Microsoft Knowledge Base:

Q156934 Visual C++ 4.2b Patch

The problem occurs because IOleObject::SetClientSite(NULL) does not release its existing pointer to ambient property interface. For example, COleControl::XOleObject::SetClientSite(NULL) doesn[ASCII 146]t call pThis->m_ambientDispDriver.ReleaseDispatch();.

The problem was fixed by adding the following line to COleControl::XOleObject::SetClientSite in the MFC source code:


   // Release existing pointer to ambient property dispinterface.
   pThis->m_ambientDispDriver.ReleaseDispatch();
   if (pClientSite != NULL)

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Visual C++ 4.2B patch.

MORE INFORMATION

Steps to Reproduce Problem

Create a new ActiveX Control using Control Wizard, and then build the control to register it.

Create a new MFC Control Container application, and insert this OLE control into the About box.

Double-click on the control to bring up the Properties window. Click on any tab of the Properties window.

Close the project workspace, open a new project workspace, or close Developer Studio. Note that Developer Studio crashes with a page fault message.

If you have an existing project that has a Control Wizard-generated control built with Visual C++ 4.2 in a dialog resource, click on the [ASCII 147]Control[ASCII 148] tab in the Properties window for the control, and then close the project, open a new project, or close Developer Studio.

Additional query words: 4.20 vcfixlist420 kbdsi

Keywords : kbole kbCtrl kbResourceEd kbVC kbVC420bug kbGrpDSTools
Version : 4.20
Platform : NT WINDOWS
Issue type : kbbug