Article: Q177103
Product(s): Microsoft C Compiler
Version(s): winnt:5.0
Operating System(s):
Keyword(s): kbole kbActiveX kbCOMt kbDlg kbMFC kbVC500bug kbVC600fix kbGrpDSMFCATL
Last Modified: 17-JUL-2001
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The information in this article applies to:
- The Microsoft Foundation Classes (MFC), used with:
- Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0
- Microsoft Visual C++, 32-bit Professional Edition, version 5.0
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SYMPTOMS
========
If you press an ALT+key combination (generating a WM_SYSCOMMAND) with keyboard
focus on the property page for an MFC ActiveX control and the key does not
correspond to a mnemonic on the page, you will get a stack overflow.
CAUSE
=====
COlePropertyPage::WindowProc() traps the WM_SYSCOMMAND and calls
IPropertyPageSite::TranslateAccelerator(). This function in turns sends the
WM_SYSCOMMAND message back to the page. This results in a recursion until you
run out of stack space.
RESOLUTION
==========
Override COlePropertyPage::WindowProc() and return TRUE if the message is a
WM_SYSCOMMAND; for example:
LRESULT CMyPropPage::WindowProc(UINT msg, WPARAM wParam, LPARAM lParam)
{
//Return without processing if WM_SYSCOMMAND.
if (WM_SYSCOMMAND == msg)
return TRUE;
else
return COlePropertyPage::WindowProc(msg, wParam, lParam);
}
STATUS
======
Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article. This problem was corrected in Visual
C++ version 6.0 for Windows.
REFERENCES
==========
(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Samson
Tanrena, Microsoft Corporation.
Additional query words: mfcole Stock PropertyPage CLSID_CFontPropPage CLSID_CColorPropPage CLSID_CPicturePropPage
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Keywords : kbole kbActiveX kbCOMt kbDlg kbMFC kbVC500bug kbVC600fix kbGrpDSMFCATL
Technology : kbAudDeveloper kbMFC
Version : winnt:5.0
Issue type : kbbug
Solution Type : kbfix
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