Clicker

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Diagnostics;
using System.Windows.Forms;
using System.Threading;
using System.Runtime.InteropServices;
using System.Xml.Serialization;
using System.IO;
using System.Xml;
using System.Collections;

namespace AutoClicker
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern void mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

        [DllImport("user32")]
        public static extern int SetCursorPos(int x, int y);

        #region Fields
        private const int MOUSEEVENTF_MOVE = 0x0001; /* mouse move */
        private const int MOUSEEVENTF_LEFTDOWN = 0x0002; /* left button down */
        private const int MOUSEEVENTF_LEFTUP = 0x0004; /* left button up */
        private const int MOUSEEVENTF_RIGHTDOWN = 0x0008; /* right button down */
        private const int MOUSEEVENTF_RIGHTUP = 0x0010; /* right button up */
        private const int MOUSEEVENTF_MIDDLEDOWN = 0x0020; /* middle button down */
        private const int MOUSEEVENTF_MIDDLEUP = 0x0040; /* middle button up */
        private const int MOUSEEVENTF_XDOWN = 0x0080; /* x button down */
        private const int MOUSEEVENTF_XUP = 0x0100; /* x button down */
        private const int MOUSEEVENTF_WHEEL = 0x0800; /* wheel button rolled */
        private const int MOUSEEVENTF_VIRTUALDESK = 0x4000; /* map to entire virtual desktop */
        private const int MOUSEEVENTF_ABSOLUTE = 0x8000; /* absolute move */


        #endregion
        public Form1()
        {
            InitializeComponent();
        }

        private static bool shouldClick = false;
        public static void toggleClick()
        {
            shouldClick = !shouldClick;
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (shouldClick)
            {
                int X = Cursor.Position.X;
                int Y = Cursor.Position.Y;
                mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, 0);
            }

        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            timer1.Interval = trackBar1.Value;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            InterceptMouse.RunHook();
        }

    }
    class InterceptMouse
    {
        private static LowLevelMouseProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;
        public static void RunHook()
        {
            _hookID = SetHook(_proc);

        }

        public static void Unhook()
        {
            UnhookWindowsHookEx(_hookID);
        }
        private static IntPtr SetHook(LowLevelMouseProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
            }
        }
        private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && MouseMessages.WM_RBUTTONDOWN == (MouseMessages)wParam)
            {
                Form1.toggleClick();
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }
        private const int WH_MOUSE_LL = 14;
        private enum MouseMessages
        {
            WM_LBUTTONDOWN = 0x0201, WM_LBUTTONUP = 0x0202, WM_MOUSEMOVE = 0x0200, WM_MOUSEWHEEL = 0x020A, WM_RBUTTONDOWN = 0x0204, WM_RBUTTONUP = 0x0205
        }
        [StructLayout(LayoutKind.Sequential)]
        private struct POINT
        {
            public int x;
            public int y;
        }
        [StructLayout(LayoutKind.Sequential)]
        private struct MSLLHOOKSTRUCT
        {
            public POINT pt;
            public uint mouseData;
            public uint flags;
            public uint time;
            public IntPtr dwExtraInfo;
        }
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProc lpfn, IntPtr hMod, uint dwThreadId);
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [
            return: MarshalAs(UnmanagedType.Bool)
        ]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);
    }
}