Chris55

Hi ...

I am expanding on a ATL Addin Framework from thomas_tom99.
http://www.codeproject.com/com/AddinProjectFramework.asp

To summarize the Addin Framework includes ATL COM (with MFC) Addin Components. The host application will use the Addin Manager to look for registered COM components with the matching CATAGORY ID and then load them into the host application. The Addin Components work nice.

The Addin Components are ATL COM with MFC. I would like to add a CFormView based object to the Addin and then access and use the view by my SDI MFC host application.

Code Snippet
// Forms below are in DLLs. We will need to get the handle for the
// resource in the DLL while the view is in use (selected)
hDLL = GetModuleHandle("Addin1.dll");
hEXE = AfxGetResourceHandle();
AfxSetResourceHandle((HINSTANCE) hDLL);
m_nAddin1View0 = m_wndHorSplitter.AddView(1, 0, RUNTIME_CLASS(CAddin1View0), pContext);
AfxSetResourceHandle(hEXE);


I get the following error:
MainFrm.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CAddin1View0::classCAddin1View0" ( classCAddin1View0@CAddin1View0@@2UCRuntimeClass@@B)


I have done this in the past with a standard MFC DLL.

---------------------
Here is the addin and host code:


In Addin1.dll I have added the CFormView derived CAddin1View0 class.

Code Snippet

class CAddin1View0 : public CFormView
{
protected:
CAddin1View0(); // protected constructor used by dynamic creation
DECLARE_DYNCREATE(CAddin1View0)

// Form Data
public:
//{{AFX_DATA(CAddin1View0)
enum { IDD = IDD_ADDIN1_VIEW0 };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA

// Attributes
public:

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAddin1View0)
public:
virtual void OnInitialUpdate();
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
virtual ~CAddin1View0();
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif

// Generated message map functions
//{{AFX_MSG(CAddin1View0)
// NOTE - the ClassWizard will add and remove member functions here.
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};


In the host application I have a window splitter and would like one of four views to show in the horizontal pane. I have created three test views in the host and am trying to gain access to the CFormView class using the method below. This is how I did it with the MFC DLLs.

I have removed some variable declaration and other non related code to make the test more readable.

I get the following error:


MainFrm.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CAddin1View0::classCAddin1View0" ( classCAddin1View0@CAddin1View0@@2UCRuntimeClass@@B)


Code Snippet

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{

if (!m_wndVerSplitter.CreateStatic(this,1,2)) // rows 1, columbs 2
{
TRACE0("Failed to create split bar ");
return FALSE; // failed to create
}

GetClientRect(&cr);

CSize paneSize(cr.Width(), nHorizonalSplitterLoc);
CSize paneSize1(cr.Width(), cr.Height() - nHorizonalSplitterLoc);

// CSize cVertpaneSize(cr.Width(), nVerticalSplitterLoc);
CSize cVertpaneSize(nVerticalSplitterLoc, cr.Height() - nHorizonalSplitterLoc);

// create a pContext pointer if it is NULL
if (pContext == NULL)
{
pContext = new CCreateContext;
}


// create the horizontal static splitter
// We are nesting the horizontal splitter into the right pane of the
// verital splitter. So we have to do some messin around here
// rows cols

m_wndHorSplitter.CreateStatic(&m_wndVerSplitter, 2, 1, WS_CHILD | WS_VISIBLE,
m_wndVerSplitter.IdFromRowCol(0, 1));

// create the top part of right pane of the splitter (row cols)
pContext->m_pNewViewClass=RUNTIME_CLASS(CMasConsoleTestListView);
pContext->m_pCurrentFrame = this;
m_wndHorSplitter.CreateView(0, 0, pContext->m_pNewViewClass, paneSize, pContext);

// We will set up the various forms that will be able to be set
// as the program is running. Note: The order of these view classes may
// be significant. We are doing some research. When you put the
// CTransactionFormView then we have some strange crashing!!

m_nView0 = m_wndHorSplitter.AddView(1, 0, RUNTIME_CLASS(CMasConsoleTestView), pContext);
m_nView1 = m_wndHorSplitter.AddView(1, 0, RUNTIME_CLASS(CMasConsoleTestView1), pContext);
m_nView2 = m_wndHorSplitter.AddView(1, 0, RUNTIME_CLASS(CMasConsoleTestView2), pContext);

// Forms below are in DLLs. We will need to get the handle for the
// resource in the DLL while the view is in use (selected)
hDLL = GetModuleHandle("Addin1.dll");
hEXE = AfxGetResourceHandle();
AfxSetResourceHandle((HINSTANCE) hDLL);
m_nAddin1View0 = m_wndHorSplitter.AddView(1, 0, RUNTIME_CLASS(CAddin1View0), pContext);
AfxSetResourceHandle(hEXE);

nCurrentHorizHeight = 123;
m_wndHorSplitter.SetRowInfo(0, nCurrentHorizHeight, nMinHorizHeight);

m_wndVerSplitter.RecalcLayout();

m_wndHorSplitter.RecalcLayout();
m_wndHorSplitter.SetActivePane(1,0);

return rc;
}

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
void CMainFrame::SetActiveView(int nViewIndex)
{
switch (nViewIndex)
{
case 0:
m_wndHorSplitter.ShowView(m_nView0);
break;

case 1:
m_wndHorSplitter.ShowView(m_nView1);
break;

case 2:
m_wndHorSplitter.ShowView(m_nView2);
break;

case 3:
m_wndHorSplitter.ShowView(m_nAddin1View0);
break;

case 4:
m_wndHorSplitter.ShowView(m_nAddin2View0);
break;

}
}


Again, I get the following error.

MainFrm.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CAddin1View0::classCAddin1View0" ( classCAddin1View0@CAddin1View0@@2UCRuntimeClass@@B)

When I comment out referecnes to the CAddin1View0 class then I'm ok. Any comments or ideas.
Thanks!
Chris

macgowan@pobox.com




Re: Visual C++ General Using a resource from an ATL COM MFC Component

Holger Grund

Chris55 wrote:


I get the following error:
MainFrm.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CAddin1View0::classCAddin1View0" ( classCAddin1View0@CAddin1View0@@2UCRuntimeClass@@B)

This suggest you're missing the correct IMPLEMENT_xxx macro.

Basically, MFC has its own runtime type information mechanism, which is not implemented with Standard C++ RTTI (i.e. typeid). There are macros which declare the required members inside the class body (DECLARE_DYNAMIC) and which provide the function bodies and data member definitions outside the class body (IMPLEMENT_RUNTIMECLASS/IMPLEMENT_DYNAMIC).

xx_DYNCREATE is just a wrapper around xx_DYNAMIC which also provides for a dynamic instance creation functionality.

You're probably just missing a IMPLEMENT_DYNCREATE in the cpp file.

-hg





Re: Visual C++ General Using a resource from an ATL COM MFC Component

Chris55

Hi ...

Thanks Holger Grund ... I did have the IMPLEMENT_DYNCREATE ... but not to the __declspec ...

I have fixed the problem by adding the __declspec (dllexport) to the CAddin1View0 class definition. I forgot to add this. Then you have to include the Addin1.lib in the project and then the application will require the Addin1.dll to be present ... this defeats the purpose of using the ATL COM Addin ... Where I can unregister the component and the host application does not care that it is missing.

I will continue to search for a method to expose the pointer to the a CRuntimeClass using the COM interface.

Any ideas
Thanks,
Chris


// the ADDIN1_DLL must be set in the project preprocessor
// definitions. This can be found in the project setting and the
// c/c++ tab. If you leave this out you will get some warnings.

#ifdef ADDIN1_DLL
#define Addin1DLLSpec __declspec (dllexport)
#else
#define Addin1DLLSpec __declspec (dllimport)
#endif

class Addin1DLLSpec CAddin1View0 : public CFormView