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To access the contents, click the chapter and section titles.
Fast Track Visual C++ 6.0 Programming
Here, we accept new keys from the user and store those keys in the document. In particular, we get a pointer to the document object using the GetDocument() function, and then add the current character to the text string with the following line: void CKeysSDIView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) { CKeysSDIDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); pDoc->text += nChar; ⇐ CView::OnChar(nChar, nRepCnt, nFlags); Invalidate(); } At the end of OnChar(), we call Invalidate() to invalidate the view, which means the program will call our OnDraw() function. In that function, weve placed code to display the text in the text object, starting at (0, 0) in the view (in an SDI program, the view covers the main windows client area, which is the area of the window excluding borders, toolbars, menus, and title bar). void CKeysSDIView::OnDraw(CDC* pDC) { CKeysSDIDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); pDC->TextOut(0, 0, pDoc->text); ⇐ } In this way, the view object handles two tasks: interacting with the user and displaying data. As well see throughout the book, thats just what the view usually does. The view objects support files, KeysSDIView.h and KeysSDIView.cpp, appear in Listing 1.5. Listing 1.5 KeysSDIView.h and KeysSDIView.cpp // KeysSDIView.h : interface of the CKeysSDIView class // ///////////////////////////////////////////////////////////////////////////// #if !defined(AFX_KEYSSDIVIEW_H__701B1ADD_9BB7_11D1_887F_D42B07C10710__INCLUDED_) #define AFX_KEYSSDIVIEW_H__701B1ADD_9BB7_11D1_887F_D42B07C10710__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 class CKeysSDIView : public CView { protected: // create from serialization only CKeysSDIView(); DECLARE_DYNCREATE(CKeysSDIView) // Attributes public: CKeysSDIDoc* GetDocument(); // Operations public: // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CKeysSDIView) 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 ~CKeysSDIView(); #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif protected: // Generated message map functions protected: //{{AFX_MSG(CKeysSDIView) afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags); //}}AFX_MSG DECLARE_MESSAGE_MAP() }; #ifndef _DEBUG // debug version in KeysSDIView.cpp inline CKeysSDIDoc* CKeysSDIView::GetDocument() { return (CKeysSDIDoc*)m_pDocument; } #endif ///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_KEYSSDIVIEW_H__701B1ADD_9BB7_11D1_887F_D42B07C10710__INCLUDED_) // KeysSDIView.cpp : implementation of the CKeysSDIView class // #include stdafx.h #include KeysSDI.h #include KeysSDIDoc.h #include KeysSDIView.h #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CKeysSDIView IMPLEMENT_DYNCREATE(CKeysSDIView, CView) BEGIN_MESSAGE_MAP(CKeysSDIView, CView) //{{AFX_MSG_MAP(CKeysSDIView) ON_WM_CHAR() //}}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() ///////////////////////////////////////////////////////////////////////////// // CKeysSDIView construction/destruction CKeysSDIView::CKeysSDIView() { // TODO: add construction code here } CKeysSDIView::~CKeysSDIView() { } BOOL CKeysSDIView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } ///////////////////////////////////////////////////////////////////////////// // CKeysSDIView drawing void CKeysSDIView::OnDraw(CDC* pDC) { CKeysSDIDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); pDC->TextOut(0, 0, pDoc->text); } ///////////////////////////////////////////////////////////////////////////// // CKeysSDIView printing BOOL CKeysSDIView::OnPreparePrinting(CPrintInfo* pInfo) { // default preparation return DoPreparePrinting(pInfo); } void CKeysSDIView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add extra initialization before printing } void CKeysSDIView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add cleanup after printing } ///////////////////////////////////////////////////////////////////////////// // CKeysSDIView diagnostics #ifdef _DEBUG void CKeysSDIView::AssertValid() const { CView::AssertValid(); } void CKeysSDIView::Dump(CDumpContext& dc) const { CView::Dump(dc); } CKeysSDIDoc* CKeysSDIView::GetDocument() // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CKeysSDIDoc))); return (CKeysSDIDoc*)m_pDocument; } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CKeysSDIView message handlers void CKeysSDIView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) { CKeysSDIDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); pDoc->text += nChar; CView::OnChar(nChar, nRepCnt, nFlags); Invalidate(); } Whats AheadIn the next chapter, well start digging into fresh material. Weve worked with two of the three kinds of EXE projects in this chapter: dialog-based and SDI programs. In the next chapter, well start working with MDI programs and supporting multiple windows and documents.
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