Services/MouseHook.cs
|
using System;
using System.Diagnostics; using System.Runtime.InteropServices; namespace pscommander { /// <summary> /// Class for intercepting low level Windows mouse hooks. /// </summary> public class MouseHook { /// <summary> /// Internal callback processing function /// </summary> private delegate IntPtr MouseHookHandler(int nCode, IntPtr wParam, IntPtr lParam); private MouseHookHandler hookHandler; /// <summary> /// Function to be called when defined even occurs /// </summary> /// <param name="mouseStruct">MSLLHOOKSTRUCT mouse structure</param> public delegate void MouseHookCallback(MSLLHOOKSTRUCT mouseStruct); #region Events public event MouseHookCallback LeftButtonDown; public event MouseHookCallback LeftButtonUp; public event MouseHookCallback RightButtonDown; public event MouseHookCallback RightButtonUp; public event MouseHookCallback MouseMove; public event MouseHookCallback MouseWheel; public event MouseHookCallback DoubleClick; public event MouseHookCallback MiddleButtonDown; public event MouseHookCallback MiddleButtonUp; #endregion /// <summary> /// Low level mouse hook's ID /// </summary> private IntPtr hookID = IntPtr.Zero; /// <summary> /// Install low level mouse hook /// </summary> /// <param name="mouseHookCallbackFunc">Callback function</param> public void Install() { hookHandler = HookFunc; hookID = SetHook(hookHandler); } /// <summary> /// Remove low level mouse hook /// </summary> public void Uninstall() { if (hookID == IntPtr.Zero) return; UnhookWindowsHookEx(hookID); hookID = IntPtr.Zero; } /// <summary> /// Destructor. Unhook current hook /// </summary> ~MouseHook() { Uninstall(); } /// <summary> /// Sets hook and assigns its ID for tracking /// </summary> /// <param name="proc">Internal callback function</param> /// <returns>Hook ID</returns> private IntPtr SetHook(MouseHookHandler proc) { using (ProcessModule module = Process.GetCurrentProcess().MainModule) return SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle(module.ModuleName), 0); } /// <summary> /// Callback function /// </summary> private IntPtr HookFunc(int nCode, IntPtr wParam, IntPtr lParam) { // parse system messages if (nCode >= 0) { if (MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam) if (LeftButtonDown != null) LeftButtonDown((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_LBUTTONUP == (MouseMessages)wParam) if (LeftButtonUp != null) LeftButtonUp((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_RBUTTONDOWN == (MouseMessages)wParam) if (RightButtonDown != null) RightButtonDown((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_RBUTTONUP == (MouseMessages)wParam) if (RightButtonUp != null) RightButtonUp((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_MOUSEMOVE == (MouseMessages)wParam) if (MouseMove != null) MouseMove((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_MOUSEWHEEL == (MouseMessages)wParam) if (MouseWheel != null) MouseWheel((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_LBUTTONDBLCLK == (MouseMessages)wParam) if (DoubleClick != null) DoubleClick((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_MBUTTONDOWN == (MouseMessages)wParam) if (MiddleButtonDown != null) MiddleButtonDown((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); if (MouseMessages.WM_MBUTTONUP == (MouseMessages)wParam) if (MiddleButtonUp != null) MiddleButtonUp((MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT))); } return CallNextHookEx(hookID, nCode, wParam, lParam); } #region WinAPI 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, WM_LBUTTONDBLCLK = 0x0203, WM_MBUTTONDOWN = 0x0207, WM_MBUTTONUP = 0x0208 } [StructLayout(LayoutKind.Sequential)] public struct POINT { public int x; public int y; } [StructLayout(LayoutKind.Sequential)] public 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, MouseHookHandler lpfn, IntPtr hMod, uint dwThreadId); [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] public 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); #endregion } } |