【MFC】基于对话框程序菜单栏不更新

环境：win10，vs2017

问题描述：

为mfc对话框程序添加了一个托盘菜单，但这个托盘菜单不响应ON_UPDATE_COMMAND_UI消息，

并且设置菜单项的勾选（SetCheck）时，可以通过代码观察到勾选成功，但菜单栏显示的勾选状态依然不变。

经过几天的百度，终于发现了问题的所在

解决方法：

原因请参考原文章，这里记录一下解决方法

第一步：在程序Dlg类中，添加消息响应

BEGIN_MESSAGE_MAP(CXXXDlg, CDialogEx)
 //..
 ON_WM_INITMENUPOPUP()
END_MESSAGE_MAP()

第二步：给Dlg类添加如下成员函数

//...
class CXXXDlg : public CDialogEx
{
	//...
	void OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex, BOOL bSysMenu);
};



void CXXXDlg::OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex, BOOL bSysMenu)
{
	// TODO: 在此处添加实现代码.
	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;
	}
}

 

原文分享：https://blog.csdn.net/jiangsheng/article/details/3781