C / C++ / MFC

Mark Salsbery wrote:

This Link[^] has info on choosing MFC DLL types and for
each type, info on proper initialization.

If the DLL opens modeless dialogs or has a main frame window of its own, the application's main 
message pump must call a routine exported by the DLL that in turn calls the 
CWinApp::PreTranslateMessage member function of the DLL's application object.

Leslie Sanford wrote:

I'm not sure I understand the above, but if it means that I have to require the host application to call a specified function in my dll

Mark Salsbery
Microsoft MVP - Visual C++

Mark Salsbery wrote:

Are your host applications always MFC or can they be straight Win32?

Leslie Sanford wrote:

I've managed to get CWnd::FromHandle to work in so far as I can create a CDialog based object that the host can display.

Mark Salsbery
Microsoft MVP - Visual C++

Mark Salsbery wrote:

What HWND are you obtaining a CWnd for? Are you doing this in your DLL?

void Editor::open(void *ptr)
{
    HWND parent = (HWND)ptr;
 
    myEditorDlg = new CMyEditorDlg(CMyEditorDlg::IDD, CWnd::FromHandle(parent));
    myEditorDlg->ShowWindow(SW_SHOWNORMAL);
    myEditorDlg->UpdateWindow();   
}

Mark Salsbery wrote:

There's a couple important issues with this:

1) Windows messages need to get routed to the MFC message system
2) Except with an MFC extension DLL, you can't pass any MFC objects
directly or indirectly across the exe/dll boundary.

Leslie Sanford wrote:

But someone on another group posted code supposedly doing just that

Mark Salsbery
Microsoft MVP - Visual C++

Mark Salsbery wrote:

I'm skeptical...the window may draw initially, but how is it going to get window messages?

bool MyAudioEditor::open(void *ptr)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState()); 
 
   // Remember the parent window 
   ASSERT(m_pPlugView == NULL); 
   m_pPlugView = new CPlugView();
 
   systemWindow = ptr;
 
   if(m_pPlugView->Create((UINT)CPlugView::IDD, CWnd::FromHandle((HWND)systemWindow))) 
   { 
       m_pPlugView->ShowWindow(SW_SHOWNORMAL);
       
       return true; 
   }
 
   return false;
}

Leslie Sanford wrote:

They can be either. I have no way of knowing beforehand if a host is MFC based

Mark Salsbery
Microsoft MVP - Visual C++