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To access the contents, click the chapter and section titles.
Fast Track Visual C++ 6.0 Programming
Listing 6.2 Redraw.h class CRedraw { protected: CMetaFileDC* pDC; public: CRedraw(){pDC = new CMetaFileDC(); pDC->Create();} ~CRedraw(){delete pDC;} CMetaFileDC* GetDC() {return pDC;} void PlayMetaFile(CDC* pRefreshDC){ HMETAFILE OldMetaFileHandle = pDC->Close(); if(OldMetaFileHandle == NULL) return; pRefreshDC->PlayMetaFile(OldMetaFileHandle); CMetaFileDC* ReplacementMetaFile = new CMetaFileDC(); ReplacementMetaFile->Create(); ReplacementMetaFile->PlayMetaFile(OldMetaFileHandle); DeleteMetaFile(OldMetaFileHandle); delete pDC; pDC = ReplacementMetaFile;} }; Listing 6.3 CirclesView.h and CirclesView.cpp // CirclesView.h : interface of the CCirclesView class // ///////////////////////////////////////////////////////////////////////////// #if !defined(AFX_CIRCLESVIEW_H__9036416F_A23B_11D1_887F_ D42B07C10710__INCLUDED_) #define AFX_CIRCLESVIEW_H__9036416F_A23B_11D1_887F_ D42B07C10710__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #include "Redraw.h" class CCirclesView : public CView { protected: // create from serialization only CCirclesView(); DECLARE_DYNCREATE(CCirclesView) CPoint point1, point2; CRedraw redraw; // Attributes public: CCirclesDoc* GetDocument(); // Operations public: // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCirclesView) 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 ~CCirclesView(); #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif protected: // Generated message map functions protected: //{{AFX_MSG(CCirclesView) afx_msg void OnLButtonDown(UINT nFlags, CPoint point); afx_msg void OnLButtonUp(UINT nFlags, CPoint point); //}}AFX_MSG DECLARE_MESSAGE_MAP() }; #ifndef _DEBUG // debug version in CirclesView.cpp inline CCirclesDoc* CCirclesView::GetDocument() { return (CCirclesDoc*)m_pDocument; } #endif ///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_CIRCLESVIEW_H__9036416F_A23B_11D1_887F_ D 42B07C10710__INCLUDED_) // CirclesView.cpp : implementation of the CCirclesView class // #include "stdafx.h" #include "Circles.h" #include "CirclesDoc.h" #include "CirclesView.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CCirclesView IMPLEMENT_DYNCREATE(CCirclesView, CView) BEGIN_MESSAGE_MAP(CCirclesView, CView) //{{AFX_MSG_MAP(CCirclesView) ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() //}}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() ///////////////////////////////////////////////////////////////////////////// // CCirclesView construction/destruction CCirclesView::CCirclesView() { // TODO: add construction code here point1.x = -1; point1.y = -1; } CCirclesView::~CCirclesView() { } BOOL CCirclesView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } ///////////////////////////////////////////////////////////////////////////// // CCirclesView drawing void CCirclesView::OnDraw(CDC* pDC) { CCirclesDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); redraw.PlayMetaFile(pDC); // TODO: add draw code for native data here } ///////////////////////////////////////////////////////////////////////////// // CCirclesView printing BOOL CCirclesView::OnPreparePrinting(CPrintInfo* pInfo) { // default preparation return DoPreparePrinting(pInfo); } void CCirclesView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add extra initialization before printing } void CCirclesView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add cleanup after printing } ///////////////////////////////////////////////////////////////////////////// // CCirclesView diagnostics #ifdef _DEBUG void CCirclesView::AssertValid() const { CView::AssertValid(); } void CCirclesView::Dump(CDumpContext& dc) const { CView::Dump(dc); } CCirclesDoc* CCirclesView::GetDocument() // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CCirclesDoc))); return (CCirclesDoc*)m_pDocument; } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CCirclesView message handlers void CCirclesView::OnLButtonDown(UINT nFlags, CPoint point) { point1 = point; CView::OnLButtonDown(nFlags, point); } void CCirclesView::OnLButtonUp(UINT nFlags, CPoint point) { point2 = point; CClientDC* pDC; pDC = new CClientDC(this); pDC->Ellipse(point1.x, point1.y, point2.x, point2.y); redraw.GetDC()->Ellipse(point1.x, point1.y, point2.x, point2.y); CView::OnLButtonUp(nFlags, point); } Whats AheadIn the next chapter, we work with the ins and outs of 32-bit memory handling, including scanning memory to see whats there, allocating and deallocating memory, and communicating between processes using shared memory. This is a popular programming topic, so lets start our exploration
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