探究MFC之Dialog系统菜单添加

探究MFC之Dialog系统菜单添加

本文描述给Dialog增加系统菜单；单击对话框左上角menu弹出的菜单，我们称为该对话框的系统菜单。

1. 启动VisualC++6.0，New->MFC AppWizard(exe) 创建Dialog示例程序MFC01；

2. 在ResourceView->String Table添加菜单项字符串，参考下面斜体项目；

   ID	Value	Caption
   IDS_ABOUTBOX	101	MFC01 のバージョン情報(&A)…
   IDS_HELLOMENU	102	Hello
   IDS_HELLOMSG	103	Hello World!!!

3. 在Resource.h文件中，定义菜单消息资源 IDM_HELLOBOX

   //{{NO_DEPENDENCIES}}
   // Microsoft Developer Studio generated include file.
   // Used by MFC01.rc
   //
   
   #define IDM_ABOUTBOX                    0x0010
   
   
   #define IDM_HELLOBOX                    0x0020
   
   
   #define IDD_ABOUTBOX                    100
   
   
   #define IDS_ABOUTBOX                    101
   
   
   #define IDD_MFC01_DIALOG                102
   
   
   #define IDS_HELLOMENU                   102
   
   
   #define IDS_HELLOMSG                    103
   
   
   #define IDR_MAINFRAME                   128
   
   
   // Next default values for new objects
   // 
   
   #ifdef APSTUDIO_INVOKED
   
   
   #ifndef APSTUDIO_READONLY_SYMBOLS
   
   
   #define _APS_NEXT_RESOURCE_VALUE        129
   
   
   #define _APS_NEXT_COMMAND_VALUE         32771
   
   
   #define _APS_NEXT_CONTROL_VALUE         1000
   
   
   #define _APS_NEXT_SYMED_VALUE           101
   
   
   #endif
   
   
   #endif
   

4. 在Dialog的初始化函数中，给系统菜单添加新的菜单项；

   /////////////////////////////////////////////////////////////////////////////
   // CMFC01Dlg message handlers
   
   BOOL CMFC01Dlg::OnInitDialog()
   {
       CDialog::OnInitDialog();
   
       // Add "About..." menu item to system menu.
   
       // IDM_ABOUTBOX must be in the system command range.
       ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
       ASSERT(IDM_ABOUTBOX < 0xF000);
   
           //验证菜单消息资源IDM_HELLOBOX有效
       ASSERT((IDM_HELLOBOX & 0xFFF0) == IDM_HELLOBOX);
       ASSERT(IDM_HELLOBOX < 0xF000);
   
       CMenu* pSysMenu = GetSystemMenu(FALSE);
       if (pSysMenu != NULL)
       {
           CString strAboutMenu;
           strAboutMenu.LoadString(IDS_ABOUTBOX);
           if (!strAboutMenu.IsEmpty())
           {
               pSysMenu->AppendMenu(MF_SEPARATOR);
               pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
           }
           //添加菜单项Hello到系统菜单中
           CString strHelloMenu;
           strHelloMenu.LoadString(IDS_HELLOMENU);
           if (!strHelloMenu.IsEmpty())
           {
               pSysMenu->AppendMenu(MF_SEPARATOR);
               pSysMenu->AppendMenu(MF_STRING, IDM_HELLOBOX, strHelloMenu);
           }
       }
   
       // Set the icon for this dialog.  The framework does this automatically
       //  when the application's main window is not a dialog
       SetIcon(m_hIcon, TRUE);         // Set big icon
       SetIcon(m_hIcon, FALSE);        // Set small icon
   
       // TODO: Add extra initialization here
   
       return TRUE;  // return TRUE  unless you set the focus to a control
   }

5. 设置新添加菜单项Hello的消息响应

   void CMFC01Dlg::OnSysCommand(UINT nID, LPARAM lParam)
   {
       if ((nID & 0xFFF0) == IDM_ABOUTBOX)
       {
           CAboutDlg dlgAbout;
           dlgAbout.DoModal();
       }
       else if ((nID & 0xFFF0) == IDM_HELLOBOX)//Hello菜单消息响应
       {
           AfxMessageBox(IDS_HELLOMSG);
       }
       else
       {
           CDialog::OnSysCommand(nID, lParam);
       }
   }