问一个关于CMenu弹出的问题，为何无法弹出呢？

2011-07-19 11:01:27 152 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

MFC自定义弹出式菜单实战：从CMenu类到TrackPopupMenu高级应用弹出式菜单作为经典的桌面软件交互元素，其核心原理是通过资源定义与动态加载实现按需触发的快捷操作。在Windows编程中，菜单资源管理与消息映射机制构成了其技术基础，CMenu类作为菜单控制器，通过LoadMenu加载资源、GetSubMenu获取子菜单、TrackPopupMenu控制显示位置与行为。这种设计模式在嵌入式上位机、工控软件等对交互效率要求高的场景中价值显著，能够提升操作的专业性与用户体验。本文以MFC框架为例，深入解析如何为CListCtrl等控件实现智能右键菜单，涵盖坐标转换、动态菜单项更新阅读详情

TrackPopup来弹出菜单，代码如下：

void ShowSubMenu(FAVORITE fav, int n)

	{

		CSimpleArray<FAVORITE> favorites = _Module.m_FavoriteConfig.GetFavoritesByNode(fav.Node);



		CPoint point(m_Controls[n].rect.left, m_Controls[n].rect.bottom);

		ClientToScreen(&point);



		int nMenuHeight = ::GetSystemMetrics(SM_CYMENU);

		int nScreenHeight = GetSystemMetrics(SM_CYFULLSCREEN);

		int nMaxCount = (nScreenHeight - point.y - 50) / nMenuHeight;



		CMenuHandle menu;

		menu.CreatePopupMenu();



		menu.AppendMenu(MF_STRING, 4000 + m_MenuFavorites.GetSize(), _T("收藏到此文件夹下"));

		menu.AppendMenu(MF_STRING, 5000 + m_MenuFavorites.GetSize(), _T("打开此文件夹下所有链接"));

		menu.AppendMenu(MF_SEPARATOR);

		m_MenuFavorites.Add(fav);



		if (favorites.GetSize() >= 0)

		{

			for (int i = 0; i < favorites.GetSize(); i++)

			{

				DWORD dwExtraAttr = ((i + 4) % nMaxCount == 0)  && _Module.m_Config.GetFavoriteMultiCol() ? MF_MENUBARBREAK : 0;

				FAVORITE * pFav = &favorites[i];



				CString title = pFav->Title.GetLength() > 30 ? pFav->Title.Left(30) + _T("...") : pFav->Title;

				if (pFav->IsFolder)

				{

					m_MenuFavorites.Add(*pFav);

					AddSubMenu(menu, dwExtraAttr, pFav, 2);

				}

				else

				{

					menu.AppendMenu(MF_STRING | dwExtraAttr, 1000 + m_MenuFavorites.GetSize(), title);

					m_MenuFavorites.Add(*pFav);

				}

			}



			MENUINFO menuInfo;

			menuInfo.cbSize = sizeof(MENUINFO);

			menuInfo.dwStyle = MNS_DRAGDROP;

			menuInfo.fMask = MIM_STYLE;

			menu.SetMenuInfo(&menuInfo);



			UINT uCmd = menu.TrackPopupMenu(TPM_LEFTBUTTON | TPM_LEFTALIGN | TPM_RETURNCMD, point.x, point.y, m_hWnd);



			menu.DestroyMenu();

		}



	}