如何在MFC中使菜单无效

[SGPRO]

我在对话框初始化中,加入如下代码

CMenu *m = this->GetMenu();

m->EnableMenuItem(
m->GetMenuItemID(IDM_NEWWORKER),
false);

设法将ID为IDM_NEWWORKER的菜单项设置为无效,
结果却是, 菜单仍然有效, 我的代码无效!
郁闷, 高手赐教

[hjiaming]

m->EnableMenuItem(
m->GetMenuItemID(IDM_NEWWORKER),
MF_BYCOMMAND | MF_DISABLED | MF_GRAYED );

[Pigwen]

改为：m->EnableMenuItem(IDM_NEWWORKER, MF_BYCOMMAND|MF_DISABLE);
试一下南

[lixiaosan]

# 在消息映射中添加ON_WM_INITMENUPOPUP 项:


BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
//{{AFX_MSG_MAP(CTestDlg)
........................
........................
//}}AFX_MSG_MAP

ON_WM_INITMENUPOPUP()
END_MESSAGE_MAP()



# 在你的对话框类中添加OnInitMenuPopup成员函数且复制下列代码到该函数（注意：代码基本上是从CFrameWnd::OnInitMenuPopup（在WinFrm.cpp中)复制过来的）:


void CTestDlg::OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex,BOOL bSysMenu)
{
ASSERT(pPopupMenu != NULL);
// Check the enabled state of various menu items.

CCmdUI state;
state.m_pMenu = pPopupMenu;
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pParentMenu == NULL);

// Determine if menu is popup in top-level menu and set m_pOther to
// it if so (m_pParentMenu == NULL indicates that it is secondary popup).
HMENU hParentMenu;
if (AfxGetThreadState()->m_hTrackingMenu == pPopupMenu->m_hMenu)
state.m_pParentMenu = pPopupMenu; // Parent == child for tracking popup.
else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
{
CWnd* pParent = this;
// Child windows don't have menus--need to go to the top!
if (pParent != NULL &&
(hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL)
{
int nIndexMax = ::GetMenuItemCount(hParentMenu);
for (int nIndex = 0; nIndex < nIndexMax; nIndex++)
{
if (::GetSubMenu(hParentMenu, nIndex) == pPopupMenu->m_hMenu)
{
// When popup is found, m_pParentMenu is containing menu.
state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
break;
}
}
}
}

state.m_nIndexMax = pPopupMenu->GetMenuItemCount();
for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax;
state.m_nIndex++)
{
state.m_nID = pPopupMenu->GetMenuItemID(state.m_nIndex);
if (state.m_nID == 0)
continue; // Menu separator or invalid cmd - ignore it.

ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pMenu != NULL);
if (state.m_nID == (UINT)-1)
{
// Possibly a popup menu, route to first item of that popup.
state.m_pSubMenu = pPopupMenu->GetSubMenu(state.m_nIndex);
if (state.m_pSubMenu == NULL ||
(state.m_nID = state.m_pSubMenu->GetMenuItemID(0)) == 0 ||
state.m_nID == (UINT)-1)
{
continue; // First item of popup can't be routed to.
}
state.DoUpdate(this, TRUE); // Popups are never auto disabled.
}
else
{
// Normal menu item.
// Auto enable/disable if frame window has m_bAutoMenuEnable
// set and command is _not_ a system command.
state.m_pSubMenu = NULL;
state.DoUpdate(this, FALSE);
}

// Adjust for menu deletions and additions.
UINT nCount = pPopupMenu->GetMenuItemCount();
if (nCount < state.m_nIndexMax)
{
state.m_nIndex -= (state.m_nIndexMax - nCount);
while (state.m_nIndex < nCount &&
pPopupMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
{
state.m_nIndex++;
}
}
state.m_nIndexMax = nCount;
}
}