Article ID: 193102 - View products that this article applies to.
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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:
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:
Steps to Reproduce Behavior
To correct this problem in the case mentioned above, add the following code in the destructor for CChildFrame:
"Debug Assertion Failed! File: Appui1.cpp line: 215".
(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:
(https://support.microsoft.com/kb/194022/ )Visual Studio 6.0 service packs, what, where, why
(https://support.microsoft.com/kb/194295/ )How to tell that a Visual Studio service pack is installed
(https://support.microsoft.com/kb/193009/ )INFO: Visual Studio 6.0 Service Pack 1 Readme
Article ID: 193102 - Last Review: February 28, 2014 - Revision: 4.2