C++ 最小化到托盘

#define  WM_SHOWTASK (WM_USER + 1)void CTestDlg::OnSysCommand(UINT nID, LPARAM lParam){    if ((nID & 0xFFF0) == IDM_ABOUTBOX)    {        CAboutDlg dlgAbout;        dlgAbout.DoModal();    }    else    {        //增加关闭时最小化到托盘的函数        if (nID == SC_CLOSE) //SC_MINIMIZE        {            ToTray();            return;        }        CDialog::OnSysCommand(nID, lParam);    }}BEGIN_MESSAGE_MAP(CTestDlg, CDialog)    ON_MESSAGE(WM_SHOWTASK, OnShowTask)    //}}AFX_MSG_MAPEND_MESSAGE_MAP()//在托盘区添加图标 最小化到托盘函数void ToTray(void);void CTestDlg::ToTray(void){    NOTIFYICONDATA nid;    nid.cbSize = (DWORD)sizeof(NOTIFYICONDATA);    nid.hWnd = this->m_hWnd;    nid.uID = IDR_MAINFRAME;    nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;    nid.uCallbackMessage = WM_SHOWTASK;//自定义的消息名称    nid.hIcon = LoadIcon(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_MAINFRAME));    wcscpy_s(nid.szTip, _T("***程序"));//信息提示条    Shell_NotifyIcon(NIM_ADD, &nid);//在托盘区添加图标    ShowWindow(SW_HIDE);//隐藏主窗口}//恢复界面函数afx_msg LRESULT OnShowTask(WPARAM wParam, LPARAM lParam);//托盘事件LRESULT CTestDlg::OnShowTask(WPARAM wParam, LPARAM lParam){    if (wParam != IDR_MAINFRAME)    {        return 1;    }    switch(lParam)    {    case WM_RBUTTONUP://右键起来时弹出快捷菜单，这里只有一个关闭    {        LPPOINT lpoint = new tagPOINT;        ::GetCursorPos(lpoint);//得到鼠标位置        CMenu menu;        menu.CreatePopupMenu();//声明一个弹出式菜单        //增加菜单项“关闭”，点击则发送消息WM_DESTROY给主窗口（已        //隐藏），将程序结束。        menu.AppendMenu(MF_STRING, WM_DESTROY, _T("退出"));        //确定弹出式菜单的位置        menu.TrackPopupMenu(TPM_LEFTALIGN, lpoint->x, lpoint->y, this);        //资源回收        HMENU hmenu = menu.Detach();        menu.DestroyMenu();        delete lpoint;    }    break;    case WM_LBUTTONDBLCLK://双击左键的处理    {        this->ShowWindow(SW_SHOW);//简单的显示主窗口        this->ShowWindow(SW_RESTORE);        DeleteTray();    }    break;    default:        break;    }    return 0;}//删除托盘中图标void DeleteTray();void CTestlDlg::DeleteTray(){    NOTIFYICONDATA nid;    nid.cbSize = (DWORD)sizeof(NOTIFYICONDATA);    nid.hWnd = this->m_hWnd;    nid.uID = IDR_MAINFRAME;    nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;    nid.uCallbackMessage = WM_SHOWTASK;//自定义的消息名称    nid.hIcon = LoadIcon(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_MAINFRAME));    wcscpy_s(nid.szTip, _T("***程序"));//信息提示条为“按计划任务提醒”    Shell_NotifyIcon(NIM_DELETE, &nid);//在托盘中删除图标}//退出程序需时需要DeleteTray();void CTestDlg::OnDestroy(){    CDialog::OnDestroy();    // TODO: 在此处添加消息处理程序代码    DeleteTray();}//修改风格使得他不在任务栏显示int CTestDlg::OnCreate(LPCREATESTRUCT lpCreateStruct){    if (CDialog::OnCreate(lpCreateStruct) == -1)        return -1;    // TODO:  在此添加您专用的创建代码    //修改风格使得他不在任务栏显示    ModifyStyleEx(WS_EX_APPWINDOW, WS_EX_TOOLWINDOW);    return 0;}

DeleteTray改为：

void CTestDlg::DeleteTray(){    NOTIFYICONDATA nid;    nid.cbSize = (DWORD)sizeof(NOTIFYICONDATA);    nid.hWnd = this->m_hWnd;    nid.uID = IDR_MAINFRAME;    nid.uFlags = NIF_ICON /*| NIF_MESSAGE | NIF_TIP*/;    //nid.uCallbackMessage = WM_SHOWTASK;//自定义的消息名称    //nid.hIcon = LoadIcon(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_MAINFRAME));    //wcscpy_s(nid.szTip, _T("***程序"));//信息提示条为“按计划任务提醒”    Shell_NotifyIcon(NIM_DELETE, &nid);//在托盘中删除图标}

否则会出现程序退出后，托盘图标还在的情况，鼠标移动到图标上后，图标一闪然后消失的问题。