Hide mouse cursor after an idle time

Question

I want to hide my mouse cursor after an idle time and it will be showed up when I move the mouse. I tried to use a timer but it didn\'t work well. Can anybody help me? Pleas

Answer 1

Need to account for Environment.Tickcount being negative:

public static class User32Interop
{

    public static TimeSpan GetLastInput()
    {
        var plii = new LASTINPUTINFO();
        plii.cbSize = (uint)Marshal.SizeOf(plii);

        if (GetLastInputInfo(ref plii))
        {
            int idleTime = unchecked(Environment.TickCount - (int)plii.dwTime);
            return TimeSpan.FromMilliseconds(idleTime);
        }
        else
            throw new Win32Exception(Marshal.GetLastWin32Error());
    }

    [DllImport("user32.dll", SetLastError = true)]
    static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

    struct LASTINPUTINFO
    {
        public uint cbSize;
        public uint dwTime;
    }
}