Article ID: 157893
Article Last Modified on 11/21/2006
APPLIES TO
- Microsoft Foundation Class Library 4.2, when used with:
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 4.2 Professional Edition
This article was previously published under Q157893
SYMPTOMS
When opening or closing a project in Developer Studio, you may see an access violation with the following error message:
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:
156934 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: kbbug kbctrl kbfix KB157893
