MFC小小计算器开发.docx

第一步：利用MFC的AppWizard生成一个基于对话框的程序(本程序工程名为Calc)，切换到Resource ，在Dialog中的IDD_CALC_DIALOG上双击，然后添控件按钮，做好外观布局，改好按钮ID和Caption； 第二步：为控件按钮增加相应的变量和事件响应函数； 第三步：在CCalcDlg类中添加相应变量； 第四步：对控件按钮的事件响应函数做处理； 代码如下： 第一部分(利用ClassWizard添加，可不必手动修改)，在CalcDlg.h中的代码修改如下： / CalcDlg.h : 头文件 / #pragma once / CCalcDlg 对话框 class CCalcDlg : public CDialog / 构造 public: CCalcDlg(CWnd* pParent = NULL); / 标准构造函数 / 对话框数据 enum IDD = IDD_CALC_DIALOG ; protected: virtual void DoDataExchange(CDataExchange* pDX); / DDX/DDV 支持 / 实现 protected: HICON m_hIcon; / 生成的消息映射函数 virtual BOOL OnInitDialog(); afx_msg void OnSysCommand(UINT nID, LPARAM lParam); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); DECLARE_MESSAGE_MAP() public: afx_msg void OnBnClickedBtnnum0(); public: afx_msg void OnBnClickedBtnnum1(); public: afx_msg void OnBnClickedBtnnum2(); public: afx_msg void OnBnClickedBtnnum3(); public: afx_msg void OnBnClickedBtnnum4(); public: afx_msg void OnBnClickedBtnnum5(); public: afx_msg void OnBnClickedBtnnum6(); public: afx_msg void OnBnClickedBtnnum7(); public: afx_msg void OnBnClickedBtnnum8(); public: afx_msg void OnBnClickedBtnnum9(); public: afx_msg void OnBnClickedBtnopadd(); public: afx_msg void OnBnClickedBtnopsub(); public: afx_msg void OnBnClickedBtnopmulti(); public: afx_msg void OnBnClickedBtnopdiv(); public: afx_msg void OnBnClickedBtnopequal(); public: afx_msg void OnBnClickedBtnclean(); public: afx_msg void OnBnClickedBtnnumradix(); protected: CString m_csEditText; /保存运算符右操作数的字符串，按下运算符按钮时将其赋给m_csFirstNumber， /然后清空，从 新接收数字 CString m_csFirstNumber; /用来保存运算符的左操作数的字符串 bool m_bRadixFlag; /小数点标志，用来确保一个数字中只包含一个小数点 double m_dFirstNumber; /用来保存从m_csFirstNumber中提取出来的浮点数 double m_dSecondNumber; /用来保存按下运算符按钮更新后的m_csEditText所包含的浮点数字 double m_dResualt; /用来保存运算结果的浮点数 int m_nOperatorFlag; /用来标志运算符 char m_cInsetNumber; /用来保存按下数字按钮时的相应数字，然后把它动态加入到m_csEditText中，构成新数字字符串 ; 第二部分，在CalcDlg.cpp中修改代码如下： / CalcDlg.cpp : 实现文件 / #include stdafx.h #include Calc.h #include CalcDlg.h #ifdef _DEBUG #define new DEBUG_NEW #endif / 用于应用程序“关于”菜单项的 CAboutDlg 对话框 class CAboutDlg : public CDialog public: CAboutDlg(); / 对话框数据 enum IDD = IDD_ABOUTBOX ; protected: virtual void DoDataExchange(CDataExchange* pDX); / DDX/DDV 支持 / 实现 protected: DECLARE_MESSAGE_MAP() ; CAboutDlg:CAboutDlg() : CDialog(CAboutDlg:IDD) void CAboutDlg:DoDataExchange(CDataExchange* pDX) CDialog:DoDataExchange(pDX); BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) END_MESSAGE_MAP() / CCalcDlg 对话框 CCalcDlg:CCalcDlg(CWnd* pParent /*=NULL*/) : CDialog(CCalcDlg:IDD, pParent) , m_csEditText(_T() , m_csFirstNumber(_T() , m_bRadixFlag(false) , m_dFirstNumber(0) , m_dSecondNumber(0) , m_dResualt(0) , m_nOperatorFlag(0) , m_cInsetNumber(0) m_hIcon = AfxGetApp()-LoadIcon(IDR_MAINFRAME); void CCalcDlg:DoDataExchange(CDataExchange* pDX) CDialog:DoDataExchange(pDX); DDX_Text(pDX, IDC_EDIT, m_csEditText); BEGIN_MESSAGE_MAP(CCalcDlg, CDialog) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() /AFX_MSG_MAP ON_BN_CLICKED(IDC_BTNNUM0, &CCalcDlg:OnBnClickedBtnnum0) ON_BN_CLICKED(IDC_BTNNUM1, &CCalcDlg:OnBnClickedBtnnum1) ON_BN_CLICKED(IDC_BTNNUM2, &CCalcDlg:OnBnClickedBtnnum2) ON_BN_CLICKED(IDC_BTNNUM3, &CCalcDlg:OnBnClickedBtnnum3) ON_BN_CLICKED(IDC_BTNNUM4, &CCalcDlg:OnBnClickedBtnnum4) ON_BN_CLICKED(IDC_BTNNUM5, &CCalcDlg:OnBnClickedBtnnum5) ON_BN_CLICKED(IDC_BTNNUM6, &CCalcDlg:OnBnClickedBtnnum6) ON_BN_CLICKED(IDC_BTNNUM7, &CCalcDlg:OnBnClickedBtnnum7) ON_BN_CLICKED(IDC_BTNNUM8, &CCalcDlg:OnBnClickedBtnnum8)ON_BN_CLICKED(IDC_BTNNUM9, &CCalcDlg:OnBnClickedBtnnum9) ON_BN_CLICKED(IDC_BTNNUMRADIX, &CCalcDlg:OnBnClickedBtnnumradix) ON_BN_CLICKED(IDC_BTNOPADD, &CCalcDlg:OnBnClickedBtnopadd) ON_BN_CLICKED(IDC_BTNOPSUB, &CCalcDlg:OnBnClickedBtnopsub) ON_BN_CLICKED(IDC_BTNOPMULTI, &CCalcDlg:OnBnClickedBtnopmulti) ON_BN_CLICKED(IDC_BTNOPDIV, &CCalcDlg:OnBnClickedBtnopdiv) ON_BN_CLICKED(IDC_BTNOPEQUAL, &CCalcDlg:OnBnClickedBtnopequal) ON_BN_CLICKED(IDC_BTNCLEAN, &CCalcDlg:OnBnClickedBtnclean) END_MESSAGE_MAP() / CCalcDlg 消息处理程序 BOOL CCalcDlg:OnInitDialog() CDialog:OnInitDialog(); / 将“关于.”菜单项添加到系统菜单中。 / IDM_ABOUTBOX 必须在系统命令范围内。 ASSERT(IDM_ABOUTBOX & 0xFFF0) = IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX AppendMenu(MF_SEPARATOR); pSysMenu-AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); / 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动 / 执行此操作 SetIcon(m_hIcon, TRUE); / 设置大图标 SetIcon(m_hIcon, FALSE); / 设置小图标 / TODO: 在此添加额外的初始化代码 return TRUE; / 除非将焦点设置到控件，否则返回 TRUE void CCalcDlg:OnSysCommand(UINT nID, LPARAM lParam) if (nID & 0xFFF0) = IDM_ABOUTBOX) CAboutDlg dlgAbout; dlgAbout.DoModal(); else CDialog:OnSysCommand(nID, lParam); / 如果向对话框添加最小化按钮，则需要下面的代码 / 来绘制该图标。对于使用文档/视图模型的 MFC 应用程序， / 这将由框架自动完成。 void CCalcDlg:OnPaint() if (IsIconic() CPaintDC dc(this); / 用于绘制的设备上下文 SendMessage(WM_ICONERASEBKGND, reinterpret_cast(dc.GetSafeHdc(), 0); / 使图标在工作矩形中居中 int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; / 绘制图标 dc.DrawIcon(x, y, m_hIcon); else CDialog:OnPaint(); /当用户拖动最小化窗口时系统调用此函数取得光标显示。 / HCURSOR CCalcDlg:OnQueryDragIcon() return static_cast(m_hIcon); void CCalcDlg:OnBnClickedBtnnum0() / TODO: Add your control notification handler code here m_cInsetNumber=0; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum1() / TODO: Add your control notification handler code here m_cInsetNumber=1; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum2() / TODO: Add your control notification handler code here m_cInsetNumber=2; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum3() / TODO: Add your control notification handler code here m_cInsetNumber=3; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum4() / TODO: Add your control notification handler code here m_cInsetNumber=4; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum5() / TODO: Add your control notification handler code here m_cInsetNumber=5; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum6() / TODO: Add your control notification handler code here m_cInsetNumber=6; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum7() / TODO: Add your control notification handler code here m_cInsetNumber=7; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum8() / TODO: Add your control notification handler code here m_cInsetNumber=8; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnum9() / TODO: Add your control notification handler code here m_cInsetNumber=9; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnnumradix() / TODO: Add your control notification handler code here if(m_bRadixFlag=FALSE) m_cInsetNumber=.; UpdateData(); m_csEditText+=m_cInsetNumber; UpdateData(FALSE); m_bRadixFlag=TRUE; else UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnopadd() / TODO: Add your control notification handler code here m_nOperatorFlag=1; m_bRadixFlag=FALSE; m_csFirstNumber=m_csEditText; m_csEditText.Empty(); UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnopsub() / TODO: Add your control notification handler code here m_nOperatorFlag=2; m_bRadixFlag=FALSE; m_csFirstNumber=m_csEditText; m_csEditText.Empty(); UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnopmulti() / TODO: Add your control notification handler code here m_nOperatorFlag=3; m_bRadixFlag=FALSE; m_csFirstNumber=m_csEditText; m_csEditText.Empty(); UpdateData(FALSE); void CCalcDlg:OnBnClickedBtnopdiv() / TODO: Add your control notification handler code here m_nOperatorFlag=4; m_bRadixFlag=FALSE; m_csFirstNumber=m_csEditText; m_csEditText.Empty(); UpdateData(FALSE); void CCalcDlg:OnBnClickedBt