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Код

AddDocTemplate(new RMultiDocTemplate(ID_DOC_REPORT,
    RUNTIME_CLASS(DDocument),  //  свой класс
    RUNTIME_CLASS(CMDIChildWnd),
    RUNTIME_CLASS(CEditView)));

Код

void CDocument::OnCloseDocument()
    // must close all views now (no prompting) - usually destroys this
{
    // destroy all frames viewing this document
    // the last destroy may destroy us
    BOOL bAutoDelete = m_bAutoDelete;
    m_bAutoDelete = FALSE;  // don't destroy document while closing views
    while (!m_viewList.IsEmpty())
    {
        // get frame attached to the view
        CView* pView = (CView*)m_viewList.GetHead();
        ASSERT_VALID(pView);
        CFrameWnd* pFrame = pView->EnsureParentFrame();

        // and close it
        PreCloseFrame(pFrame);
        pFrame->DestroyWindow();
            // will destroy the view as well
    }
    m_bAutoDelete = bAutoDelete;

    // clean up contents of document before destroying the document itself
    DeleteContents();

    // delete the document if necessary
    if (m_bAutoDelete)
        delete this; // ЗДЕСЬ ВЫСКАКИВАЕТ ОШИБКА
}