VC编写任务栏右下角图标程序

任务栏右下角图标程序：
在CMainFrame头文件中定义变量：  
NOTIFYICONDATA  nid;

在OnCreate函数中或者初始化函数中：
nid.cbSize = sizeof(NOTIFYICONDATA);
nid.hWnd = m_hWnd;
nid.uID = IDI_SYSTEMTRAY; //图标的ID
nid.uFlags = NIF_MESSAGE|NIF_ICON|NIF_TIP;
nid.uCallbackMessage = WM_SYSTEMTRAY; //图标对应的消息的ID
nid.hIcon = AfxGetApp()->LoadIcon(IDI_SYSTEMTRAY);
wcscpy_s(nid.szTip,10, L"桌面锁");
::Shell_NotifyIcon(NIM_ADD,&nid);

用ON_MESSAGE将WM_SYSTEMTRAY与消息函数绑定：
LRESULT CMainFrame::OnSystemTray(WPARAM wParam, LPARAM lParam)
{
    if(wParam == IDI_SYSTEMTRAY)
    {
        switch(lParam)
        {
        case WM_LBUTTONDOWN:
            {
                break;
            }

        case WM_RBUTTONDOWN:
            {
                break;
            }

        case WM_LBUTTONDBLCLK:
            {
                break;
            }
        }
    }
    return 0;
}

在程序退出之前还要：
NOTIFYICONDATA nid;
nid.cbSize = sizeof(NOTIFYICONDATA);
nid.hWnd = m_hWnd;
nid.uID = IDI_SYSTEMTRAY;
nid.uFlags = 0;
::Shell_NotifyIcon(NIM_DELETE, &nid);