// CMainFrame::OnChangeFileMenu() is a menu command handler for // CMainFrame class, which in turn is a CFrameWnd-derived class. // It modifies the File menu by inserting, removing and renaming // some menu items. Other operations include associating a context // help id and setting default menu item to the File menu. // CMainFrame is a CFrameWnd-derived class. void CMainFrame::OnChangeFileMenu() { // Get the menu from the application window. CMenu* mmenu = GetMenu(); // Look for "File" menu. int pos = FindMenuItem(mmenu, "&File"); if (pos == -1) return; // Remove "New" menu item from the File menu. CMenu* submenu = mmenu->GetSubMenu(pos); pos = FindMenuItem(submenu, "&New\tCtrl+N"); if (pos > -1) submenu->RemoveMenu(pos, MF_BYPOSITION); // Look for "Open" menu item from the File menu. Insert a new // menu item called "Close" right after the "Open" menu item. // ID_CLOSEFILE is the command id for the "Close" menu item. pos = FindMenuItem(submenu, "&Open...\tCtrl+O"); if (pos > -1) submenu->InsertMenu(pos + 1, MF_BYPOSITION, ID_CLOSEFILE, "&Close"); // Rename menu item "Save" to "Save Selection". pos = FindMenuItem(submenu, "&Save\tCtrl+S"); if (pos > -1) { UINT id = submenu->GetMenuItemID(pos); submenu->ModifyMenu(id, MF_BYCOMMAND, id, "&Save Selection"); } // Associate a context help ID with File menu, if one is not found. // ID_FILE_CONTEXT_HELPID is the context help ID for the File menu // that is defined in resource file. if (submenu->GetMenuContextHelpId() == 0) submenu->SetMenuContextHelpId(ID_FILE_CONTEXT_HELPID); // Set "Open" menu item as the default menu item for the File menu, // if one is not found. So, when a user double-clicks the File // menu, the system sends a command message to the menu's owner // window and closes the menu as if the File\Open command item had // been chosen. if (submenu->GetDefaultItem(GMDI_GOINTOPOPUPS, TRUE) == -1) { pos = FindMenuItem(submenu, "&Open...\tCtrl+O"); submenu->SetDefaultItem(pos, TRUE); } }// FindMenuItem() will find a menu item string from the specified // popup menu and returns its position (0-based) in the specified // popup menu. It returns -1 if no such menu item string is found. int FindMenuItem(CMenu* Menu, LPCTSTR MenuString) { ASSERT(Menu); ASSERT(::IsMenu(Menu->GetSafeHmenu())); int count = Menu->GetMenuItemCount(); for (int i = 0; i < count; i++) { CString str; if (Menu->GetMenuString(i, str, MF_BYPOSITION) && (strcmp(str, MenuString) == 0)) return i; } return -1; }
// CMainFrame class, which in turn is a CFrameWnd-derived class.
// It modifies the File menu by inserting, removing and renaming
// some menu items. Other operations include associating a context
// help id and setting default menu item to the File menu.
// CMainFrame is a CFrameWnd-derived class.
void CMainFrame::OnChangeFileMenu()
{
// Get the menu from the application window.
CMenu* mmenu = GetMenu(); // Look for "File" menu.
int pos = FindMenuItem(mmenu, "&File");
if (pos == -1)
return; // Remove "New" menu item from the File menu.
CMenu* submenu = mmenu->GetSubMenu(pos);
pos = FindMenuItem(submenu, "&New\tCtrl+N");
if (pos > -1)
submenu->RemoveMenu(pos, MF_BYPOSITION); // Look for "Open" menu item from the File menu. Insert a new
// menu item called "Close" right after the "Open" menu item.
// ID_CLOSEFILE is the command id for the "Close" menu item.
pos = FindMenuItem(submenu, "&Open...\tCtrl+O");
if (pos > -1)
submenu->InsertMenu(pos + 1, MF_BYPOSITION, ID_CLOSEFILE, "&Close"); // Rename menu item "Save" to "Save Selection".
pos = FindMenuItem(submenu, "&Save\tCtrl+S");
if (pos > -1)
{
UINT id = submenu->GetMenuItemID(pos);
submenu->ModifyMenu(id, MF_BYCOMMAND, id, "&Save Selection");
} // Associate a context help ID with File menu, if one is not found.
// ID_FILE_CONTEXT_HELPID is the context help ID for the File menu
// that is defined in resource file.
if (submenu->GetMenuContextHelpId() == 0)
submenu->SetMenuContextHelpId(ID_FILE_CONTEXT_HELPID); // Set "Open" menu item as the default menu item for the File menu,
// if one is not found. So, when a user double-clicks the File
// menu, the system sends a command message to the menu's owner
// window and closes the menu as if the File\Open command item had
// been chosen.
if (submenu->GetDefaultItem(GMDI_GOINTOPOPUPS, TRUE) == -1)
{
pos = FindMenuItem(submenu, "&Open...\tCtrl+O");
submenu->SetDefaultItem(pos, TRUE);
}
}// FindMenuItem() will find a menu item string from the specified
// popup menu and returns its position (0-based) in the specified
// popup menu. It returns -1 if no such menu item string is found.
int FindMenuItem(CMenu* Menu, LPCTSTR MenuString)
{
ASSERT(Menu);
ASSERT(::IsMenu(Menu->GetSafeHmenu())); int count = Menu->GetMenuItemCount();
for (int i = 0; i < count; i++)
{
CString str;
if (Menu->GetMenuString(i, str, MF_BYPOSITION) &&
(strcmp(str, MenuString) == 0))
return i;
} return -1;
}
UINT nPosition,
UINT nFlags,
UINT_PTR nIDNewItem = 0,
LPCTSTR lpszNewItem = NULL
);
BOOL ModifyMenu(
UINT nPosition,
UINT nFlags,
UINT_PTR nIDNewItem,
const CBitmap* pBmp
);
然后
ModifyMenu 即可
CString str;
pMenu->GetMenuString(ID_FILE_TEST, str, MF_BYCOMMAND);
if ( str == "开始")
{
pMenu->ModifyMenu(ID_FILE_TEST, MF_BYCOMMAND, ID_FILE_TEST, "停止");}