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Article ID: 193102 - Last Review: August 7, 2007 - Revision: 4.2
FIX: Assert in Appui1.cpp Line 215 in MFC SDI/MDI application
This article was previously published under Q193102
When you try to display a modal window without explicitly specifying a
parent in a command handler of an MFC SDI/MDI application, where the frame
window is destroyed in the command handler before displaying the modal
window, you might get an assertion in CCmdTarget::GetRoutingFrame_()
(Appui1.cpp line: 215) with debug builds.
In the release builds of the application, modal windows may behave similar
to modeless windows. This will also be the case if you update an MFC
application from Visual C++ 5.0 to Visual C++ 6.0 (both versions of Visual C++ use the MFC DLL
named MFC42.dll).
Modal windows now use the routing frame data member (m_pRoutingFrame) of
the thread state to decide on the owner in GetSafeOwner(). The problem is
that the CFrameWnd set as the thread state's current routing frame
is deleted, but the thread state is not updated to reflect that fact.
Set the thread state's current routing frame to NULL in the destructor of
your CFrameWnd derived class that is being destroyed:
CMyFrameWnd::~CMyFrameWnd()
{
if( AfxGetThreadState()->m_pRoutingFrame == this )
{
AfxGetThreadState()->m_pRoutingFrame = NULL;
}
}
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This bug has been fixed in the Visual
Studio 6.0 Service Pack 1.
To obtain this service pack, please see:
The MFC frame windows affected by this problem can be of type CFrameWnd,
CMDIFrameWnd, CMDIChildWnd, and COleIPFrameWnd.
The MFC modal windows affected are:
- Dialog
- CPropertySheet
- Ole Property Sheet [invoked through [ASCII 150]
OleObject::DoVerb(OLEIVERB_PROPERTIES)]
- COleBusyDialog
- Message Box [invoked through AfxMessageBox()]
- MAPI modal window [when calling MAPISendMail()]
- SQL Driver Connection dialog box [when calling SQLDriverConnect()]
Steps to Reproduce Behavior
- Use AppWizard to generate an MFC exe that is an MDI-based application.
- Use ClassWizard to override OnCloseDocument of the CDocument class
generated by AppWizard.
- Edit the OnCloseDocument member function as shown here:
void CMyDoc::OnCloseDocument()
{
CDocument::OnCloseDocument();
AfxMessageBox("The Document is Closed");
}
- Build and run the application.
- On the File menu, click Close.
RESULTS: The following error appears:
"Debug Assertion Failed! File:
Appui1.cpp line: 215".
To correct this problem in the case mentioned above, add the following code
in the destructor for CChildFrame:
CChildFrame::~CChildFrame()
{
if( AfxGetThreadState()->m_pRoutingFrame == this )
{
AfxGetThreadState()->m_pRoutingFrame = NULL;
}
}
(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Bret
Bentzinger, Microsoft
For more information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:
194022Â
(http://kbalertz.com/Feedback.aspx?kbNumber=194022/
)
Visual Studio 6.0 service packs, what, where, why
194295Â
(http://kbalertz.com/Feedback.aspx?kbNumber=194295/
)
How to tell that a Visual Studio service pack is installed
193009Â
(http://kbalertz.com/Feedback.aspx?kbNumber=193009/
)
INFO: Visual Studio 6.0 Service Pack 1 Readme
APPLIES TO
- Microsoft Foundation Class Library 4.2, when used with:
- Microsoft Visual C++ 6.0 Enterprise Edition
- Microsoft Visual C++ 6.0 Professional Edition
- Microsoft Visual C++, 32-bit Learning Edition 6.0
| kbbug kbfix kbqfe kbvs600sp1fix kbvc600sp1fix kbdocview kbvs600sp2fix KB193102 |
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