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CMenu::ModifyMenu

Changes an existing menu item at the position specified by nPosition.

BOOL ModifyMenu(
   UINT nPosition,
   UINT nFlags,
   UINT_PTR nIDNewItem = 0,
   LPCTSTR lpszNewItem = NULL 
);
BOOL ModifyMenu(
   UINT nPosition,
   UINT nFlags,
   UINT_PTR nIDNewItem,
   const CBitmap* pBmp 
);

Параметры

  • nPosition
    Specifies the menu item to be changed. The nFlags parameter can be used to interpret nPosition in the following ways:

    nFlags

    Interpretation of nPosition

    MF_BYCOMMAND

    Specifies that the parameter gives the command ID of the existing menu item. This is the default if neither MF_BYCOMMAND nor MF_BYPOSITION is set.

    MF_BYPOSITION

    Specifies that the parameter gives the position of the existing menu item. The first item is at position 0.

  • nFlags
    Specifies how nPosition is interpreted and gives information about the changes to be made to the menu item. For a list of flags that may be set, see the AppendMenu member function.

  • nIDNewItem
    Specifies either the command ID of the modified menu item or, if nFlags is set to MF_POPUP, the menu handle (HMENU) of a pop-up menu. The nIDNewItem parameter is ignored (not needed) if nFlags is set to MF_SEPARATOR.

  • lpszNewItem
    Specifies the content of the new menu item. The nFlags parameter can be used to interpret lpszNewItem in the following ways:

    nFlags

    Interpretation of lpszNewItem

    MF_OWNERDRAW

    Contains an application-supplied 32-bit value that the application can use to maintain additional data associated with the menu item. This 32-bit value is available to the application when it processes MF_MEASUREITEM and MF_DRAWITEM.

    MF_STRING

    Contains a long pointer to a null-terminated string or to a CString.

    MF_SEPARATOR

    The lpszNewItem parameter is ignored (not needed).

  • pBmp
    Points to a CBitmap object that will be used as the menu item.

Возвращаемое значение

Nonzero if the function is successful; otherwise 0.

Заметки

The application specifies the new state of the menu item by setting values in nFlags. If this function replaces a pop-up menu associated with the menu item, it destroys the old pop-up menu and frees the memory used by the pop-up menu.

When nIDNewItem specifies a pop-up menu, it becomes part of the menu in which it is inserted. If that menu is destroyed, the inserted menu will also be destroyed. An inserted menu should be detached from a CMenu object to avoid conflict.

Whenever a menu that resides in a window is changed (whether or not the window is displayed), the application should call CWnd::DrawMenuBar. To change the attributes of existing menu items, it is much faster to use the CheckMenuItem and EnableMenuItem member functions.

Пример

See the example for CMenu::InsertMenu.

Требования

Header: afxwin.h

См. также

Основные понятия

CMenu Class

CMenu Members

Hierarchy Chart

CMenu::AppendMenu

CMenu::InsertMenu

CMenu::CheckMenuItem

CWnd::DrawMenuBar

CMenu::EnableMenuItem

CMenu::SetMenuItemBitmaps

CMenu::Detach

ModifyMenu