Multiview SDI application in MFC

Use and refine following code to develop a  multiview SDI application in VC++ MFC.

void CMainFrame::Set_View(UINT ViewID)
{
    // If the view the user selected is already displaying, do nothing
    if( ViewID == m_Current View )
        return;

    // Get a pointer to the current view
    CView* pCurrentView = GetActiveView();

    // We are about to change the view, so we need a pointer to the runtime class
    CRuntimeClass* pNewView;

    // We will process a form
    // First, let's change the identifier of the current view to our integer
    ::SetWindowLong(pCurrentView->m_hWnd, GWL_ID, m_CurrentView);

    // Now we will identify what form the user selected
    switch(ViewID)
    {
        case IDD_DMFRM2_FORM:
            pNewView = RUNTIME_CLASS(CdmFrm2View);
            break;

        case IDD_STUDENT_DETAILS:
            pNewView = RUNTIME_CLASS(CStudent_Details_Page);
            break;
    }

    // We will deal with the frame
    CCreateContext crtContext;

    // We have a new view now. So we initialize the context
    crtContext.m_pNewViewClass = pNewView;
    // No need to change the document. We keep the current document
    crtContext.m_pCurrentDoc   = GetActiveDocument();

    CView* pNewViewer = STATIC_DOWNCAST(CView, CreateView(&crtContext));

    // Now we can create a new view and get rid of the previous one
    if( pNewViewer != NULL )
    {
        pNewViewer->ShowWindow(SW_SHOW);
        pNewViewer->OnInitialUpdate();
        SetActiveView(pNewViewer);
        RecalcLayout();
        m_CurrentView = ViewID;
        pCurrentView->DestroyWindow();
    }
}

Pass the ID of the view which you want to display to the function Set_View() to display it.

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