(转\学)API获取当前进行空闲时间

[StructLayout(LayoutKind.Sequential)]
        public struct LASTINPUTINFO
        {
            [MarshalAs(UnmanagedType.U4)]
            public int cbSize;
            [MarshalAs(UnmanagedType.U4)]
            public uint dwTime;
        }
        [DllImport("user32.dll")]
        public static extern bool GetLastInputInfo(ref    LASTINPUTINFO plii);
        public long getIdleTick()
        {
            LASTINPUTINFO vLastInputInfo = new LASTINPUTINFO();
            vLastInputInfo.cbSize = Marshal.SizeOf(vLastInputInfo);
            if (!GetLastInputInfo(ref    vLastInputInfo)) return 0;
            return Environment.TickCount - (long)vLastInputInfo.dwTime;
        }