dll imports

[DllImport("user32.dll")]
        static extern void mouse_event(int a, int b, int c, int d, int swed);

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);



        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);

        [DllImport("User32.Dll")]
        public static extern long SetCursorPos(int x, int y);

        [DllImport("user32.dll")]
        static extern short GetAsyncKeyState(Keys vkey);


        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        int x;
        int y;
        bool on = false;
        const int leftDown = 0x02;
        const int leftUp = 0x04;
        Point pos = new Point(0, 0);