[wxVTK] wxAuiNotebook with wxVTK

[KR L. <lo...@gm...>]

Hello,

I am using a wxAuiNotebook which has a page that is a
wxVTKRenderWindowInteractor.  Everything works fine until I either close the
page or exit the application, at which time the application will crash or I
get an error in the VTK debug window about trying to delete an object with a
non-zero reference count, depending on how I handle deleting the
wxVTKRenderWindowInteractor (wxVTK from here on).  For simplicity, I'll
focus on just the case of closing the application.  If in the main frame's
destructor, I do nothing to remove the wxVTK object, I get the error about
deleting an object with a non-zero ref. count (makes sense).  I added the
wxVTKObject->Delete(), which does reduce the reference count to zero, but
this causes a crash in wxObject (this is called from
wxAuiNotebook::DeletePage()):

bool wxObject::IsKindOf(wxClassInfo *info) const
{
    wxClassInfo *thisInfo = GetClassInfo();// Crashes on this line
    return (thisInfo) ? thisInfo->IsKindOf(info) : false ;
}

I think I am successfully deleting the wxVTK object with the ->Delete()
function, and then the notebook is trying to access it again in it's
destructor.  Is this something anyone has experienced before?  Has anyone
found a solution?

I came up with a method that compiles and runs just fine, but I have doubts
about whether or not this is a good (safe?) approach.  I have not tested for
memory leaks, but I suspect that if this method doesn't work, that will be
why.  Below is the code for my main frame's destructor:

MainFrame::~MainFrame()
{
    m_mgr.UnInit();

    if (wxVTKObject)
    {
        wxVTKObject->Delete();// Delete the wxVTKRenderWindowInteractor the
proper way
        wxWindow *Dummy = new wxWindow();// Create a dummy wxWindow

        // Assign the pointer for the wxVTKRenderWindowInteractor to point
to a wxWindow
        // object instead.  Now when the wxAuiNotebook is deleted, this will
point to
        // something than can be deleted?
        wxVTKObject = (wxVTKRenderWindowInteractor*)Dummy;
    }
}

Is this OK?  Is there a better way?

I'm using wxWidgets 2.8.7 and VTK 5.0 in MSW.


Thank you for your help,

Kerry