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Listing 10.5 CounterView.h and CounterView.cpp
    // CounterView.h : interface of the CCounterView class
    //
    /////////////////////////////////////////////////////////////////////////////

    #if
    !defined(AFX_COUNTERVIEW_H__A45E4A83_A79A_11D1_887F_D42B07C10710__INCLUDED_)
    #define AFX_COUNTERVIEW_H__A45E4A83_A79A_11D1_887F_D42B07C10710__INCLUDED_

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

    class CCounterView : public CView
    {
    protected: // create from serialization only
        CCounterView();
        DECLARE_DYNCREATE(CCounterView)

    // Attributes
    public:
        CCounterDoc* GetDocument();

    // Operations
    public:

    // Overrides
        // ClassWizard generated virtual function overrides
        //{{AFX_VIRTUAL(CCounterView)
        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 ~CCounterView();
    #ifdef _DEBUG
        virtual void AssertValid() const;
        virtual void Dump(CDumpContext& dc) const;
    #endif

    protected:

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

    #ifndef _DEBUG  // debug version in CounterView.cpp
    inline CCounterDoc* CCounterView::GetDocument()
       { return (CCounterDoc*)m_pDocument; }
    )

    #endif

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

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

    #endif // !defined(AFX_COUNTERVIEW_H__A45E4A83_A79A_11D1_887F_D42B07C10710__INCLUDED_)

    // CounterView.cpp : implementation of the CCounterView class
    //

    #include “stdafx.h”
    #include “Counter.h”

    #include “CounterDoc.h”
    #include “CounterView.h”
    #include “CounterDLL.h”

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

    /////////////////////////////////////////////////////////////////////////////
    // CCounterView

    IMPLEMENT_DYNCREATE(CCounterView, CView)

    BEGIN_MESSAGE_MAP(CCounterView, CView)
        //{{AFX_MSG_MAP(CCounterView)
        ON_COMMAND(ID_FILE_INCREMENTCOUNTER, OnFileIncrementcounter)
        //}}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()

    /////////////////////////////////////////////////////////////////////////////
    // CCounterView construction/destruction

    CCounterView::CCounterView()
    {
        // TODO: add construction code here

    }

    CCounterView::~CCounterView()
    {
    }

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

        return CView::PreCreateWindow(cs);
    }

    /////////////////////////////////////////////////////////////////////////////
    // CCounterView drawing

    void CCounterView::OnDraw(CDC* pDC)
    {
        CCounterDoc* pDoc = GetDocument();
        ASSERT_VALID(pDoc);

        // TODO: add draw code for native data here
    }

    /////////////////////////////////////////////////////////////////////////////
    // CCounterView printing

    BOOL CCounterView::OnPreparePrinting(CPrintInfo* pInfo)

    {
        // default preparation
        return DoPreparePrinting(pInfo);
    }

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

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

    /////////////////////////////////////////////////////////////////////////////
    // CCounterView diagnostics

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

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

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

    /////////////////////////////////////////////////////////////////////////////
    // CCounterView message handlers

    void CCounterView::OnFileIncrementcounter()

    {
        // TODO: Add your command handler code here
        IncrementCounter();
    }
### What’s Ahead In the next chapter, we use one of the most powerful of all Windows programming constructs—Windows hooks. With a hook, you can read keystrokes, mouse actions, or other events even before the process they are targeted for does. Working behind the scenes in this way gives you a lot of advantages.
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