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。

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

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!!!

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

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
}

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);
}
}