C# - Maus kontrollieren

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;


namespace Program
{
    public class Win32Input
    {
        [DllImport("user32.dll", EntryPoint = "SendInput", SetLastError = true)]
        static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

        [DllImport("user32.dll", EntryPoint = "GetMessageExtraInfo", SetLastError = true)]
        static extern IntPtr GetMessageExtraInfo();

        private enum InputType
        {
            INPUT_MOUSE = 0,
            INPUT_KEYBOARD = 1,
            INPUT_HARDWARE = 2,
        }

        [Flags()]
        private enum MOUSEEVENTF
        {
            MOVE = 0x0001,  // mouse move 
            LEFTDOWN = 0x0002,  // left button down
            LEFTUP = 0x0004,  // left button up
            RIGHTDOWN = 0x0008,  // right button down
            RIGHTUP = 0x0010,  // right button up
            MIDDLEDOWN = 0x0020,  // middle button down
            MIDDLEUP = 0x0040,  // middle button up
            XDOWN = 0x0080,  // x button down 
            XUP = 0x0100,  // x button down
            WHEEL = 0x0800,  // wheel button rolled
            VIRTUALDESK = 0x4000,  // map to entire virtual desktop
            ABSOLUTE = 0x8000,  // absolute move
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct MOUSEINPUT
        {
            public int dx;
            public int dy;
            public int mouseData;
            public MOUSEEVENTF dwFlags;
            public int time;
            public IntPtr dwExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct INPUT
        {
            public InputType type;
            public MOUSEINPUT mi;
        }
        /// <summary>
        /// Diese Funktion bewegt den Mauscursor an einen bestimmten Punkt.
        /// </summary>
        /// <param name="x">X Koordinate der Position als absoluter Pixelwert</param>
        /// <param name="y">Y Koordinate der Position als absoluter Pixelwert</param>
        /// <returns>Liefert 1 bei Erfolg und 0, wenn der Eingabestream schon blockiert war zurück.</returns>
        public static uint Move(int x, int y)
        {
            // Bildschirm Auflösung
            float ScreenWidth = Screen.PrimaryScreen.Bounds.Width;
            float ScreenHeight = Screen.PrimaryScreen.Bounds.Height;

            INPUT input_move = new INPUT();
            input_move.type = InputType.INPUT_MOUSE;

            input_move.mi.dx = (int)Math.Round(x * (65535 / ScreenWidth), 0);
            input_move.mi.dy = (int)Math.Round(y * (65535 / ScreenHeight), 0);
            input_move.mi.mouseData = 0;
            input_move.mi.dwFlags = (MOUSEEVENTF.MOVE | MOUSEEVENTF.ABSOLUTE);
            input_move.mi.time = 0;
            input_move.mi.dwExtraInfo = GetMessageExtraInfo();

            INPUT[] input = { input_move };
            return SendInput(1, input, Marshal.SizeOf(input_move));
        }

        /// <summary>
        /// Diese Funktion simuliert einen einfach Mausklick mit der linken Maustaste an der aktuellen Cursurposition.
        /// </summary>
        /// <returns>Liefert 2 zurück, wenn beide Aktionen (Maus down und Maus up) erfolgreich waren. Andernfalls 1 oder 0.</returns>
        public static uint Click()
        {
            INPUT input_down = new INPUT();
            input_down.type = InputType.INPUT_MOUSE;

            input_down.mi.dx = 0;
            input_down.mi.dy = 0;
            input_down.mi.mouseData = 0;
            input_down.mi.dwFlags = MOUSEEVENTF.LEFTDOWN;
            input_down.mi.time = 0;
            input_down.mi.dwExtraInfo = GetMessageExtraInfo();

            INPUT input_up = input_down;
            input_up.mi.dwFlags = MOUSEEVENTF.LEFTUP;

            INPUT[] input = { input_down, input_up };
            return SendInput(2, input, Marshal.SizeOf(input_down));
        }
    }
}