>_<:这里第一次介绍MFC的时间函数，功能和Win32里的计时器类似。

>_<:这里还介绍了MFC的图形绘制函数，和Win32有一点区别

>_<:ABC.h

1 #define EX 1            //该点左鼠标 2 #define OH 2            //该点右鼠标 3  4 class CMyApp : public CWinApp 5 { 6 public: 7     virtual BOOL InitInstance (); 8 }; 9 10 class CMainWindow : public CFrameWnd     //不是继承CFrameWnd 因此需要在CMainWindow()自己定义窗口类了11 {12 protected:13 14 public:15     CMainWindow ();16 17 protected:18     virtual void PostNcDestroy ();//在程序终止之前销毁CMainWindow对象19 20     afx_msg int OnCreate (LPCREATESTRUCT lpcs);21     afx_msg void OnTimer (UINT nTimerID);22     DECLARE_MESSAGE_MAP ()23 };

>_<:ABC.cpp

1 #include 
     
       2 #include "ABC.h" 3 #define ID_TIMER_ELLIPSE 1 4 #define ID_TIMER_RECTANGLE 2 5  6 CMyApp myApp; 7  8 / 9 // CMyApp member functions10 11 BOOL CMyApp::InitInstance ()12 {13     m_pMainWnd = new CMainWindow;14     m_pMainWnd->ShowWindow (m_nCmdShow);15     m_pMainWnd->UpdateWindow ();16     return TRUE;17 }18 19 /20 // CMainWindow message map and member functions21 22 BEGIN_MESSAGE_MAP (CMainWindow, CFrameWnd)23     ON_WM_CREATE ()24     ON_WM_TIMER ()25 END_MESSAGE_MAP ()26 27 CMainWindow::CMainWindow ()28 {29     //初始化游戏30     //InitGame();31     32 33     34     //注册一个 WNDCLASS 窗口类.35     CString strWndClass = AfxRegisterWndClass (36         CS_DBLCLKS,                                        // Class style（有双击时间发生的窗口类型）37         AfxGetApp ()->LoadStandardCursor (IDC_ARROW),   // Class cursor（加载一个系统光标，也可自己定义）38         (HBRUSH) (COLOR_3DFACE + 1),                    // Background brush（每次：：BeginPaint时用它清空客户区）；COLOR_3DFACE+1是指定窗口具有与按钮对话框一致的背景色和其他一些3D属性；默认为灰亮色39         AfxGetApp ()->LoadStandardIcon (IDI_WINLOGO)    // Class icon（加载系统图标，也可自己定义）40     );41 42     //调用CWnd::CreateEx()创建主窗口43     //第一个参数表示0个或是多个WS_EX标志组合；2：AfxRegisterWndClass（）返回的WNDCLASS名称；44     //3、标题；4、窗口样式45     CreateEx (0, strWndClass, _T ("Timer"),46         WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION | WS_MINIMIZEBOX,   //WS_THICKFRAME窗口可调大小属性（这里不用）47         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, //初始位置和大小，这里用CW_USEDEFAULT让Windows拾取窗口和大小48         NULL, NULL);49 50     //处理窗口位置和尺寸51     CRect rect (0, 0, 352, 352);       //理想客户区窗口矩形形状52     CalcWindowRect (&rect);            //根据分辨率、菜单...计算窗口矩形大小（必须在窗口创建后调用）53 54     SetWindowPos (NULL, 0, 0, rect.Width (), rect.Height (),55         SWP_NOZORDER | SWP_NOMOVE | SWP_NOREDRAW);56 }57 58 //在程序结束之前销毁创建的CMainWindow对象59 void CMainWindow::PostNcDestroy ()60 {61     delete this;62 }63 64 65 66 int CMainWindow::OnCreate (LPCREATESTRUCT lpcs)67 {68     if (CFrameWnd::OnCreate (lpcs) == -1)69         return -1;70 71     if (!SetTimer (ID_TIMER_ELLIPSE, 100, NULL)||72         !SetTimer (ID_TIMER_RECTANGLE, 100, NULL)) {73         MessageBox (_T ("Error: SetTimer failed"));74         return -1;75     }76     return 0;77 }78 79 void CMainWindow::OnTimer (UINT nTimerID)80 {81     CRect rect;82     GetClientRect (&rect);83 84     int x1 = rand () % rect.right;85     int x2 = rand () % rect.right;86     int y1 = rand () % rect.bottom;87     int y2 = rand () % rect.bottom;88 89     CClientDC dc (this);90     CBrush brush (RGB (rand () % 255, rand () % 255, rand () % 255));91     CBrush* pOldBrush = dc.SelectObject (&brush);92     if (nTimerID == ID_TIMER_ELLIPSE)93         dc.Ellipse (min (x1, x2), min (y1, y2), max (x1, x2),94             max (y1, y2));95     else 96         dc.Rectangle (min (x1, x2), min (y1, y2), max (x1, x2),97             max (y1, y2));98     dc.SelectObject (pOldBrush);99 }