CRuntimeClass::FromName and MFC state

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Hello , so my problem is with docking of a bar . The problem is that the application isn't reading properly from the registry when one tab is docked over other tab. The error is CArchiveException. After some debugging i found that CRuntimeClass::FromName returns NULL and this is the reason for the exception . The class which isn't recognized is CBCGPTabbedControlBar from BCGSoft. It is part from the class CBGPDockingControlBar which i am using for my docking bars as a inherited class. I saw that in FromName (arccore.cpp) the classes in the list are populated from

AFX_MODULE_STATE* pModuleState = AfxGetModuleState();

The class CBCGPTabbedControlBaris serialized and it had CRunTimeClass structure.I tested it with

CObject *mObject = new CBCGPTabbedControlBar;
       mObject->IsKindOf(RUNTIME_CLASS( CBCGPTabbedControlBar));

When i read for AfxGetModuleState() i understand that there are 3 kinds of MFC states: Module State, Process State, and Thread State and AfxGetModuleState()returns only the structures with module state . I should say that this is happening in a thread so my question is: is it CBCGPTabbedControlBar with Thread state? and if yes how could set him with module state so it would be recognized from FromName function.(reminding its a BCGSoft defined Class).

I saw article about MS adding some BCGSoft classes. I thought i can change the class CBGPDockingControlBar into CMFCDockingControlBar but this doesn't exist
My other question is: is there similar CMFCXXX class for CBGPDockingControlBar?

Thx for your help

Posted 12-Jun-12 21:32pm

Argonia

Updated 12-Jun-12 21:44pm

v2

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2 solutions

Solution 1

this may not be 100% related to your proble, but MFC has a handle map for HWNDs to CWnd* pointers. These handle maps are thread specific. So if you are trying to lookup an MFC CWnd type pointer it will not be found.

As you mention you are doing this work in a thread, it sounds like you probably need to move this functionality to the UI thread which does contain the handle map.

As a general rule I would never access a CWnd* pointer from a worker thread. If you do need to update controls etc, you should post/send a message from your worker thread to the UI thread and have that update the windows.

Posted 13-Jun-12 2:38am

Roger Allen

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Argonia 13-Jun-12 9:44am

It is in the UI Thread (more specifically the one which loads the window and all the bars and ets.)
I wonder why when in FromName loads the AFX_MODULE_STATE s the pModuleState->m_classList is empty (i am not sure if the CBCGPTabbedControlBar should be here )
and pModuleState->m_libraryList doesn't contain the BCGSoft library(classes)

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Argonia · Accepted Answer · 2012-06-13T20:58:00

Well this is embarrassing. After one good night sleep and more reading in CodeProject articles i realized that the library of BCGSoft was never loaded with

HMODULE m_hResDll = LoadLibrary(_T("xxx.dll"));

So now it recognizes the class but the problem remains. Now it trows exception because CBCGPTabbedControlBar is not derived from CBGPDockingControlBar

//arcobj.cpp code
...

// check for correct derivation
	if (pClassRefRequested != NULL &&
		!pClassRef->IsDerivedFrom(pClassRefRequested))
	{
	   AfxThrowArchiveException(CArchiveException::badClass, m_strFileName);
	}
...

After serious testing i saw that the problem was elsewhere. The problem was that when its reading from LoadState its looking for a object of this type CBCGPTabbedControlBar and because it cant find it (the Frame isn't created by the usual way with CSingleDocTemplate )it gives the exception.
After creating new class derived from CBCGPTabbedControlBar and using the function CBCGPDockingControlBar::SetTabbedControlBarRTC i managed to fix the problem.
And i didn't need the LoadLibrary(_T(xxx.dll));