WPF捕捉Windows关机事件

1    private const int SC_SCREENSAVE = 0xF140;
2         private const int WM_QUERYENDSESSION = 0x0011;
3         private bool IsScreenSave = false;
4         private bool IsWindowStopClosing = false;

1    // 获得窗口句柄
2                 IntPtr hwnd = new WindowInteropHelper(this).Handle;
3                 // 在Win32窗口中显示WPF的内容
4                 HwndSource src = HwndSource.FromHwnd(hwnd);
5                 //接收窗口消息的处理程序实现（基于 System.Windows.Interop.HwndSourceHook 委托）
6                 src.AddHook(new HwndSourceHook(WndProc));

 1     /// <summary>
 2         /// 重新WndProc
 3         /// </summary>
 4         /// <param name="hwnd">窗口句柄</param>
 5         /// <param name="msg">消息ID</param>
 6         /// <param name="wParam">消息的 wParam 值</param>
 7         /// <param name="lParam">消息的 lParam 值</param>
 8         /// <param name="handled">指示该消息是否已处理的值。如果该消息已处理，请将值设置为 true；否则请将其设置为 false</param>
 9         /// <returns></returns>
10         private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
11         {
12             if (msg == WM_QUERYENDSESSION)
13             {
14                 using (var wcf = new KeFuServicesClient())
15                 {
16                     wcf.UpdateUserState(MainPanelWindow.ClientServiceID, UserStates.UnLine);
17                 }
18             }
19             return IntPtr.Zero;
20         }