code/Device/MouseHook.cs

Go to the documentation of this file.

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;

namespace Sylloge.Device
{
    public class GlobalMouseHandler
    {
        #region Events

        public delegate void DelegateMouseEvent(int wParam, Sylloge.WinAPI.MouseInput mouseHook);
        public static event DelegateMouseEvent MouseEvent;

        public static void OnMouseEvent(int wParam, Sylloge.WinAPI.MouseInput mouseHook)
        {
            if (GlobalMouseHandler.MouseEvent != null) { GlobalMouseHandler.MouseEvent(wParam, mouseHook); }
        }

        #endregion

        #region Local Attributes

        private static bool IsInitialized = false;

        #endregion

        #region External Calls (Mouse Specific)

        [DllImport("User32.dll", SetLastError = true)]
        public static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProcDelegate lpfn, IntPtr hmod, int dwThreadId);
        [DllImport("User32.dll", SetLastError = true)]
        public static extern IntPtr CallNextHookEx(IntPtr hHook, int nCode, int wParam, ref Sylloge.WinAPI.MouseInput lParam);

        public delegate IntPtr LowLevelMouseProcDelegate(int nCode, int wParam, ref Sylloge.WinAPI.MouseInput lParam);

        public static IntPtr HookLowLevelMouse;

        public static LowLevelMouseProcDelegate MouseDelegate;

        #endregion

        #region Class Methods and Properties

        public static void Initialize()
        {
            if (GlobalMouseHandler.IsInitialized) { return; } // Don't allow multiple initializations
            GlobalMouseHandler.MouseDelegate += GlobalMouseHandler.LowLevelMouseProc;
            GlobalMouseHandler.HookLowLevelMouse = SetWindowsHookEx(Sylloge.WinAPI.Constants.WH_MOUSE_LL,
                                                    GlobalMouseHandler.MouseDelegate,
                                                    System.Diagnostics.Process.GetCurrentProcess().MainModule.BaseAddress,
                                                    0);
            GlobalMouseHandler.IsInitialized = true;
        }

        public static void Dispose()
        {
            Sylloge.WinAPI.User32.UnhookWindowsHookEx(GlobalMouseHandler.HookLowLevelMouse);
            GlobalMouseHandler.MouseDelegate -= GlobalMouseHandler.LowLevelMouseProc;
            GlobalMouseHandler.IsInitialized = false;
        }

        public static IntPtr LowLevelMouseProc(int nCode, int wParam, ref Sylloge.WinAPI.MouseInput lParam)
        {
            try {
                GlobalMouseHandler.OnMouseEvent(wParam, lParam);
            } catch (Exception ex) {
                Console.WriteLine("LowLevelProc Ex: {0}", ex);
            }
            return CallNextHookEx(HookLowLevelMouse, nCode, wParam, ref lParam);
        }

        public static System.Windows.Forms.Cursor CreateCursor(System.Drawing.Bitmap bmp, int x, int y)
        {
            IntPtr ptr = bmp.GetHicon();
            WinAPI.IconInfo tmp = new WinAPI.IconInfo();
            WinAPI.User32.GetIconInfo(ptr, ref tmp);
            tmp.xHotspot = x;
            tmp.yHotspot = y;
            tmp.fIcon = false;
            ptr = WinAPI.User32.CreateIconIndirect(ref tmp);
            return new System.Windows.Forms.Cursor(ptr);
        }

        #endregion
    }
}