在TaskBar上将应用程序显示为单个图标(VC++/MFC)

class CMyApp : public CWinApp
{
public:
    CMyApp();
    virtual BOOL InitInstance();
    DECLARE_MESSAGE_MAP()
};

class CMainFrame : public CFrameWnd
{
public:
    CMainFrame();
    virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
    afx_msg void OnClose();
    afx_msg void OnShowTaskBarIcon(WPARAM wParam, LPARAM lParam);
    DECLARE_MESSAGE_MAP()

private:
    NOTIFYICONDATA m_nid;
};

CMyApp::CMyApp()
{
}

BOOL CMyApp::InitInstance()
{
    // ...

    // 注册消息
    RegisterWindowMessage(L"ShowTaskBarIcon");

    // ...

    return TRUE;
}

CMainFrame::CMainFrame()
{
    // 初始化NOTIFYICONDATA结构体
    memset(&m_nid, 0, sizeof(m_nid));
    m_nid.cbSize = sizeof(m_nid);
    m_nid.hWnd = m_hWnd;
    m_nid.uID = IDR_MAINFRAME;
    m_nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
    m_nid.uCallbackMessage = RegisterWindowMessage(L"ShowTaskBarIcon");
    m_nid.hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    wcscpy_s(m_nid.szTip, L"应用程序名称");
}

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    // ...

    // 设置窗口样式为弹出式窗口
    cs.dwExStyle |= WS_EX_TOOLWINDOW;

    // ...

    return CFrameWnd::PreCreateWindow(cs);
}

void CMainFrame::OnClose()
{
    // ...

    // 隐藏TaskBar图标
    Shell_NotifyIcon(NIM_DELETE, &m_nid);

    // ...

    CFrameWnd::OnClose();
}

void CMainFrame::OnShowTaskBarIcon(WPARAM wParam, LPARAM lParam)
{
    // 根据消息参数显示或隐藏TaskBar图标
    if (wParam)
    {
        Shell_NotifyIcon(NIM_ADD, &m_nid);
    }
    else
    {
        Shell_NotifyIcon(NIM_DELETE, &m_nid);
    }
}

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
    // ...

    ON_MESSAGE(RegisterWindowMessage(L"ShowTaskBarIcon"), OnShowTaskBarIcon)
END_MESSAGE_MAP()

ON_COMMAND(ID_SHOW_TASKBAR_ICON, OnShowTaskBarIcon)