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To access the contents, click the chapter and section titles.
Fast Track Visual C++ 6.0 Programming
The Main Window ObjectThe main window class is CMainFrame, and the support files for this class are MainFrm.h and MainFrm.cpp. You can see how the main window is built in the CMainFrame::OnCreate() function. Here, the windows toolbar and status bars are created and added to the window. int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CFrameWnd::OnCreate(lpCreateStruct) == -1) return -1; if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) || !m_wndToolBar.LoadToolBar(IDR_MAINFRAME)) { TRACE0(Failed to create toolbar\n); return -1; // fail to create } if (!m_wndStatusBar.Create(this) || !m_wndStatusBar.SetIndicators(indicators, sizeof(indicators)/sizeof(UINT))) { TRACE0(Failed to create status bar\n); return -1; // fail to create } // TODO: Delete these three lines if you dont want the toolbar to // be dockable m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY); EnableDocking(CBRS_ALIGN_ANY); DockControlBar(&m_wndToolBar); return 0; } Another useful function is CMainFrame::PreCreateWindow(), because you can change the windows class before it is first displayed. BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs) { if( !CFrameWnd::PreCreateWindow(cs) ) return FALSE; // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return TRUE; } Well see how to change the cursor our window uses later in this book by modifying this function. The MainFrame class is a good one to know, but the real meat of the program comes in the document and view classes, which well turn to now. The listing for MainFrm.h and MainFrm.cpp appear in Listing 1.3. Listing 1.3 MainFrm.h and MainFrm.cpp // MainFrm.h : interface of the CMainFrame class // ///////////////////////////////////////////////////////////////////////////// #if !defined(AFX_MAINFRM_H__701B1AD9_9BB7_11D1_887F_D42B07C10710__INCLUDED_) #define AFX_MAINFRM_H__701B1AD9_9BB7_11D1_887F_D42B07C10710__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 class CMainFrame : public CFrameWnd { protected: // create from serialization only CMainFrame(); DECLARE_DYNCREATE(CMainFrame) // Attributes public: // Operations public: // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CMainFrame) virtual BOOL PreCreateWindow(CREATESTRUCT& cs); //}}AFX_VIRTUAL // Implementation public: virtual ~CMainFrame(); #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif protected: // control bar embedded members CStatusBar m_wndStatusBar; CToolBar m_wndToolBar; // Generated message map functions protected: //{{AFX_MSG(CMainFrame) afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct); // NOTE - the ClassWizard will add and remove member functions here. // DO NOT EDIT what you see in these blocks of generated code! //}}AFX_MSG DECLARE_MESSAGE_MAP() }; ///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_MAINFRM_H__701B1AD9_9BB7_11D1_887F_D42B07C10710__INCLUDED_) // MainFrm.cpp : implementation of the CMainFrame class // #include stdafx.h #include KeysSDI.h #include MainFrm.h #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CMainFrame IMPLEMENT_DYNCREATE(CMainFrame, CFrameWnd) BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd) //{{AFX_MSG_MAP(CMainFrame) // NOTE - the ClassWizard will add and remove mapping macros here. // DO NOT EDIT what you see in these blocks of generated code ! ON_WM_CREATE() //}}AFX_MSG_MAP END_MESSAGE_MAP() static UINT indicators[] = { ID_SEPARATOR, // status line indicator ID_INDICATOR_CAPS, ID_INDICATOR_NUM, ID_INDICATOR_SCRL, }; ///////////////////////////////////////////////////////////////////////////// // CMainFrame construction/destruction CMainFrame::CMainFrame() { // TODO: add member initialization code here } CMainFrame::~CMainFrame() { } int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CFrameWnd::OnCreate(lpCreateStruct) == -1) return -1; if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) || !m_wndToolBar.LoadToolBar(IDR_MAINFRAME)) { TRACE0(Failed to create toolbar\n); return -1; // fail to create } if (!m_wndStatusBar.Create(this) || !m_wndStatusBar.SetIndicators(indicators, sizeof(indicators)/sizeof(UINT))) { TRACE0(Failed to create status bar\n); return -1; // fail to create } // TODO: Delete these three lines if you dont want the toolbar to // be dockable m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY); EnableDocking(CBRS_ALIGN_ANY); DockControlBar(&m_wndToolBar); return 0; } BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs) { if( !CFrameWnd::PreCreateWindow(cs) ) return FALSE; // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return TRUE; } ///////////////////////////////////////////////////////////////////////////// // CMainFrame diagnostics #ifdef _DEBUG void CMainFrame::AssertValid() const { CFrameWnd::AssertValid(); } void CMainFrame::Dump(CDumpContext& dc) const { CFrameWnd::Dump(dc); } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CMainFrame message handlers When you work with a Visual C++ program, you mainly work with the document and view objects, as we have already done in our KeysSDI program. Lets turn to these objects now, beginning with the document object. The Document ObjectThe document and view objects in a Visual C++ program have a special relationship. The document object stores the programs data, and the view object displays it. The original idea was to make it easy to store and retrieve the data to and from disk (well cover file handling in Chapter 5, Real-World Programming: The Editor Application), but this separation of data storage and display has come to seem natural to Visual C++ programmers. In our KeysSDI program, weve placed the string that the user has typed in an MFC CString object named text.
----------------------- | Document Object | | | | | | text | | | -----------------------
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