private int CallNextHook(int code, KeyboardMessage message, ref KeyboardState state)
 {
     if (code >= 0) {
         KeyboardHookedEventArgs e = new KeyboardHookedEventArgs(message, ref state);
         OnKeyboardHooked(e);
         if (e.Cancel) {
             return -1;
         }
     }
     return CallNextHookEx(IntPtr.Zero, code, message, ref state);
 }
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 internal KeyboardHookedEventArgs(KeyboardMessage message, ref KeyboardState state)
 {
     this.message = message;
     this.state = state;
 }
 private static extern int CallNextHookEx(IntPtr hook, int code, KeyboardMessage message, ref KeyboardState state);