Detecting user idleness

Detecting user idleness<DIV>Another Win32 thing that didn't make it into the framework... sometimes you need to know if the user is idle.  Win32 provides a handy function for this, GetLastInputInfo.  Here's the stuff you need to call it from C#:</DIV> <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV>[StructLayout(LayoutKind.Sequential)] public struct LASTINPUTINFO { public Int32 cbSize; public Int32 dwTime; }; [DllImport("USER32.DLL", SetLastError=true)] private static extern bool GetLastInputInfo(ref LASTINPUTINFO ii);</DIV> int GetIdleTime() {   LASTINPUTINFO ii = new LASTINPUTINFO();   ii.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(ii);   if (GetLastInputInfo(ref ii))   {     // Got it, return the delta     return Environment.TickCount - ii.dwTime;   } else   {     // Fill in your own blank here   } }</BLOCKQUOTE> Caveat:  GetLastInputInfo doesn't work on the Win9x OS's, and there doesn't seem to be any way of using the other mechanism commonly used for detecting user idleness, installing a global keyboard and mouse hook via SetWindowsHookEx, from C#.  Doh.  Thu, 01 Sep 2005 19:17:06 GMT