WPF captures Windows shutdown events

 1  private  const  int  sc_screensave = 0xf140   2  private  const  int  wm_queryendsession = 0x0011  ;  3  private  bool  isscreensave = false   4  private  bool  iswindowstopclosing = false ; 

variables

No nonsense, just paste the code, in the constructor

Public xx{

 1  //  2  IntPtr hwnd = new Windowinterophelper (this  ). Handle;  3   display the contents of WPF in the Win32 window  4  HwndSource src = Hwndsource.fromhwnd (HWND);  5   handler implementation for receiving window messages (based on System.Windows.Interop.HwndSourceHook delegate)  6  Src. Addhook (new  HwndSourceHook (WndProc)); 

Register

}

1     /// <summary>2         ///re-WndProc3         /// </summary>4         /// <param name= "hwnd" >window Handle</param>5         /// <param name= "MSG" >Message ID</param>6         /// <param name= "WParam" >the WParam value of the message</param>7         /// <param name= "LParam" >the LParam value of the message</param>8         /// <param name= "handled" >A value that indicates whether the message has been processed. If the message is processed, set the value to true, otherwise set it to false</param>9         /// <returns></returns>Ten         PrivateINTPTR WndProc (INTPTR hwnd,intMSG, IntPtr WParam, IntPtr LParam,ref BOOLhandled) One         { A             if(msg = =wm_queryendsession) -             { -                 using(varWCF =Newkefuservicesclient ()) the                 { - WCF. Updateuserstate (Mainpanelwindow.clientserviceid, userstates.unline); -                 } -             } +             returnIntPtr.Zero; -}

capturing operating system shutdown events

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