C # global mouse hook

C # global mouse hook

////// Global hook with the mouse ///Public class MouseHook {private const int WM_MOUSEMOVE = 0x200; private const int WM_LBUTTONDOWN = 0x201; private const int WM_RBUTTONDOWN = 0x204; private const int WM_MBUTTONDOWN = 0x207; private const int WM_LBUTTONUP = 0x202; private const int WM_RBUTTONUP = 0x205; private const int WM_MBUTTONUP = 0x208; private const int WM_LBUTTONDBLCLK = 0x203; private const int WM_RBUTTONDBLCLK = 0x206; private const int WM_MBUTTONDBLCLK = 0x209 ;////// Point ///[StructLayout (LayoutKind. Sequential)] public class POINT {public int x; public int y ;}////// Hook structure ///[StructLayout (LayoutKind. sequential)] public class MouseHookStruct {public POINT pt; public int hWnd; public int wHitTestCode; public int dwExtraInfo;} public const int WH_MOUSE_LL = 14; // mouse hook constant // function of the device hook [DllImport (user32.dll, CharSet = CharSet. auto, CallingConvention = CallingConvention. stdCall)] public static extern int SetWindowsHookEx (int idHook, HookProc lpfn, IntPtr hInstance, int threadId); // remove the hook function [DllImport (user32.dll, CharSet = CharSet. auto, CallingConvention = CallingConvention. stdCall)] public static extern bool UnhookWindowsHookEx (int idHook); // function of the next hook [DllImport (user32.dll, CharSet = CharSet. auto, CallingConvention = CallingConvention. stdCall)] public static extern int CallNextHookEx (int idHook, int nCode, Int32 wParam, IntPtr lParam); // global mouse event public event MouseEventHandler OnMouseActivity; // hook callback function public delegate int HookProc (int nCode, Int32 wParam, IntPtr lParam); // declare the private HookProc _ mouseHookProcedure; private static int _ hMouseHook = 0; // mouse hook handle ////// Constructor ///Public MouseHook (){}////// Destructor ///~ MouseHook () {Stop ();}////// Start the global hook ///Public void Start () {// install the mouse hook if (_ hMouseHook = 0) {// generate a HookProc instance. _ mouseHookProcedure = new HookProc (MouseHookProc); _ hMouseHook = SetWindowsHookEx (WH_MOUSE_LL, _ mouseHookProcedure, Marshal. getHINSTANCE (System. reflection. assembly. getExecutingAssembly (). getModules () [0]), 0); // if the device fails to Stop the hook if (_ hMouseHook = 0) {Stop (); throw new Exception (SetWindowsHookEx failed .);}}} ////// Stop the global hook ///Public void Stop () {bool retMouse = true; if (_ hMouseHook! = 0) {retMouse = UnhookWindowsHookEx (_ hMouseHook); _ hMouseHook = 0;} // if the hook fails to be detached if (! (RetMouse) throw new Exception (UnhookWindowsHookEx failed .);}////// Mouse hook callback function ///Private int MouseHookProc (int nCode, Int32 wParam, IntPtr lParam) {// if the message is normal and the user wants to listen to the mouse if (nCode> = 0) & (OnMouseActivity! = Null) {MouseButtons button = MouseButtons. none; int clickCount = 0; switch (wParam) {case WM_LBUTTONDOWN: button = MouseButtons. left; clickCount = 1; break; case WM_LBUTTONUP: button = MouseButtons. left; clickCount = 1; break; case WM_LBUTTONDBLCLK: button = MouseButtons. left; clickCount = 2; break; case WM_RBUTTONDOWN: button = MouseButtons. right; clickCount = 1; break; case WM_RBUTTONUP: Ton = MouseButtons. right; clickCount = 1; break; case WM_RBUTTONDBLCLK: button = MouseButtons. right; clickCount = 2; break;} // obtain the mouse information from the callback function: MouseHookStruct MyMouseHookStruct = (MouseHookStruct) Marshal. ptrToStructure (lParam, typeof (MouseHookStruct); MouseEventArgs e = new MouseEventArgs (button, clickCount, MyMouseHookStruct.pt. x, MyMouseHookStruct.pt. y, 0); // if you want to restrict the moving area of the mouse in the screen, you can set it here. // you need to consider it later. If (! Screen. primaryScreen. bounds. contains (e. x, e. y) {// return 1;} OnMouseActivity (this, e);} // start the next hook return CallNextHookEx (_ hMouseHook, nCode, wParam, lParam );}}