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Listing 4.3 ComboView.h and ComboView.cpp
    // ComboView.h : interface of the CComboView class
    //
    /////////////////////////////////////////////////////////////////////////////

    #if
    !defined(AFX_COMBOVIEW_H__D36DAA6D_9E10_11D1_887F_D42B07C10710__INCLUDED_)
    #define AFX_COMBOVIEW_H__D36DAA6D_9E10_11D1_887F_D42B07C10710__INCLUDED_

    #if _MSC_VER > 1000
    #pragma once
    #endif // _MSC_VER > 1000

    class CComboView : public CView
    {
    protected: // create from serialization only
        CComboView();
        DECLARE_DYNCREATE(CComboView)
        int m_FigureType;

    // Attributes
    public:
        CComboDoc* GetDocument();

    // Operations
    public:

    // Overrides
        // ClassWizard generated virtual function overrides
        //{{AFX_VIRTUAL(CComboView)
        public:
        virtual void OnDraw(CDC* pDC);  // overridden to draw this view
        virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
        protected:
        virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
        virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
        virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);
        //}}AFX_VIRTUAL

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

    protected:

    // Generated message map functions
    protected:
        //{{AFX_MSG(CComboView)
        afx_msg void OnDrawFigure();
        //}}AFX_MSG
        DECLARE_MESSAGE_MAP()
    };

    #ifndef _DEBUG  // debug version in ComboView.cpp
    inline CComboDoc* CComboView::GetDocument()
       { return (CComboDoc*)m_pDocument; }
    #endif

    /////////////////////////////////////////////////////////////////////////////

    //{{AFX_INSERT_LOCATION}}
    // Microsoft Visual C++ will insert additional declarations immediately before the previous line.

    #endif // !defined(AFX_COMBOVIEW_H__D36DAA6D_9E10_11D1_887F_D42B07C10710__INCLUDED_)

    // ComboView.cpp : implementation of the CComboView class
    //

    #include “stdafx.h”
    #include “Combo.h”
    #include “MainFrm.h”

    #include “ComboDoc.h”
    #include “ComboView.h”

    #ifdef _DEBUG
    #define new DEBUG_NEW
    #undef THIS_FILE
    static char THIS_FILE[] = __FILE__;
    #endif

    /////////////////////////////////////////////////////////////////////////////
    // CComboView

    IMPLEMENT_DYNCREATE(CComboView, CView)

    BEGIN_MESSAGE_MAP(CComboView, CView)
        //{{AFX_MSG_MAP(CComboView)
        ON_COMMAND(ID_DRAW, OnDrawFigure)
        //}}AFX_MSG_MAP
        // Standard printing commands
        ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
        ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
        ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
    END_MESSAGE_MAP()

    /////////////////////////////////////////////////////////////////////////////
    // CComboView construction/destruction

    CComboView::CComboView()
    {
        m_FigureType = 0;

        // TODO: add construction code here
    }

    CComboView::~CComboView()
    {
    }

    BOOL CComboView::PreCreateWindow(CREATESTRUCT& cs)
    {
        // TODO: Modify the Window class or styles here by modifying
        //  the CREATESTRUCT cs

        return CView::PreCreateWindow(cs);
    }
    /////////////////////////////////////////////////////////////////////////////
    // CComboView drawing

    void CComboView::OnDraw(CDC* pDC)
    {
        CComboDoc* pDoc = GetDocument();
        ASSERT_VALID(pDoc);

        switch(m_FigureType){

        case 0:
         pDC->Ellipse(200, 50, 400, 250);
         break;
        case 1:
         pDC->Rectangle(200, 50, 400, 250);
         break;
        case 2:
         pDC->RoundRect(200, 50, 400, 250, 20, 20);
         break;
        }
        // TODO: add draw code for native data here
    }

    /////////////////////////////////////////////////////////////////////////////
    // CComboView printing

    BOOL CComboView::OnPreparePrinting(CPrintInfo* pInfo)
    {
        // default preparation
        return DoPreparePrinting(pInfo);
    }

    void CComboView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
    {
        // TODO: add extra initialization before printing
    }

    void CComboView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
    {
        // TODO: add cleanup after printing
    }

    /////////////////////////////////////////////////////////////////////////////
    // CComboView diagnostics

    #ifdef _DEBUG
    void CComboView::AssertValid() const
    {
        CView::AssertValid();
    }

    void CComboView::Dump(CDumpContext& dc) const
    {
        CView::Dump(dc);
    }

    CComboDoc* CComboView::GetDocument() // non-debug version is inline
    {
        ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CComboDoc)));
        return (CComboDoc*)m_pDocument;
    }
    #endif //_DEBUG

    /////////////////////////////////////////////////////////////////////////////
    // CComboView message handlers

    void CComboView::OnDrawFigure()
    {
        m_FigureType = ((CMainFrame*) GetParent())->GetItemNumber();
        Invalidate();
        // TODO: Add your command handler code here

    }
### What’s Ahead In the next chapter, we forge ahead, bringing together what we’ve seen in the last few chapters as we build a real-world application. As we dig deeper into more advanced topics, many new topics, from file handling to working with the clipboard, will come up.
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