CMenu::GetMenuItemInfo

  • 项目

BOOL CMenu::GetMenuItemInfo( UINT nIDItem**, LPMENUITEMINFO** lpMenuItemInfo**, BOOL** ByPos = FALSE );

Return Value

If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, use the Win32 function , as described in the Platform SDK.

Parameters

nIDItem

Identifier or position of the menu item to get information about. The meaning of this parameter depends on the value of ByPos.

lpMenuItemInfo

A pointer to a , as described in the Platform SDK, that contains information about the menu.

ByPos

Value specifying the meaning of nIDItem. By default, ByPos is FALSE, which indicates that uItem is a menu item identifier. If ByPos is not set to FALSE, it indicates a menu item position.

Remarks

This member function implements the behavior of the of the Win32 function , as described in the Platform SDK.

Note that in the MFC implementation of GetMenuItemInfo, you do not use a handle to a menu.

Example

// CMainFrame::OnToggleTestMenuItem() is a menu command handler for
// "Test" menu item (whose resource id is ID_HELP_TEST). It toggles
// the checked or unchecked state of the "Test" menu item.
// CMainFrame is a CFrameWnd-derived class.

void CMainFrame::OnToggleTestMenuItem()
{
   // Get the popup menu which contains the "Test" menu item.
   CMenu* mmenu = GetMenu();
   CMenu* submenu = mmenu->GetSubMenu(3);

   // Check the state of the "Test" menu item. Check the menu item
   // if it is currently unchecked. Otherwise, uncheck the menu item
   // if it is not currently checked.
   MENUITEMINFO info;
   info.cbSize = sizeof (MENUITEMINFO); // must fill up this field
   info.fMask = MIIM_STATE;             // get the state of the menu item
   VERIFY(submenu->GetMenuItemInfo(ID_HELP_TEST, &info));

   if (info.fState & MF_CHECKED)
      submenu->CheckMenuItem(ID_HELP_TEST, MF_UNCHECKED | MF_BYCOMMAND);
   else
      submenu->CheckMenuItem(ID_HELP_TEST, MF_CHECKED | MF_BYCOMMAND);
}

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See Also   CWnd::GetMenu, CMenu::GetMenuItemCount, CMenu::GetMenuItemID