How To Detect Mouse wheel Scrolling by Any Function in User32.dll in C#

Question

I am trying to detect user activity by "keyboard and mouse" on any program in Windows.

I detect Keyboard activity and mouse click by GetAsyncKeyState() in user32.Dll ".

I detect Mouse Movement by System.Windows.Forms.Cursor.Position;

I am searching to find a way for detecting mouse wheel scrolling on any program in windows and any position on screen.

I know it possible by user32.Dll function like GetMessage() . I am never use widows form control event like MouseWheel Event, Because it work only on current program, not at all.

thanks.

Answer 1

https://coderedirect.com/questions/511479/mouse-wheel-event-to-work-with-hovered-control https://gist.github.com/HamzaAnis/90d53662a1659be9d2c74f1dc490cb88 https://docs.microsoft.com/en-gb/windows/win32/api/winuser/ns-winuser-msllhookstruct?redirectedfrom=MSDN helpful links

good question

if this helps below is a class that has most of the mouse hooks so you can pick and choose make an to use it you have to assign the standard click

 var mhM = new MouseHook(); mhM.SetHook(); mhM.MouseClickEvent += (object sender, MouseEventArgs e) => { };

 public class MouseHook { private Point point; private Point Point { get { return point; } set { if (point != value) { point = value; if (MouseMoveEvent != null) { var e = new MouseEventArgs(MouseButtons.None, 0, point.X, point.Y, 0); MouseMoveEvent(this, e); //MouseClickEvent(this, new MouseEventArgs(MouseButtons.None, 0, point.X, point.Y, 0)); //MouseDownEvent(this, new MouseEventArgs(MouseButtons.None, 0, point.X, point.Y, 0)); //MouseUpEvent(this, new MouseEventArgs(MouseButtons.None, 0, point.X, point.Y, 0)); } } } } private int hHook; 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; private const int WM_MOUSEWHEEL = 0x20A; public const int WH_MOUSE_LL = 14; public Win32Api.HookProc hProc; public MouseHook() { this.Point = new Point(); } public int SetHook() { hProc = new Win32Api.HookProc(MouseHookProc); hHook = Win32Api.SetWindowsHookEx(WH_MOUSE_LL, hProc, IntPtr.Zero, 0); return hHook; } public void UnHook() { Win32Api.UnhookWindowsHookEx(hHook); } private int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)//, LPARAM Addtl_Info_L { Win32Api.MouseHookStruct MyMouseHookStruct = (Win32Api.MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(Win32Api.MouseHookStruct)); if (nCode < 0) { return Win32Api.CallNextHookEx(hHook, nCode, wParam, lParam); } else { //Console.WriteLine("mouse" + MouseClickEvent.ToString()); if (MouseClickEvent != null) { MouseButtons button = MouseButtons.None; int clickCount = 0; switch ((Int32)wParam) { case WM_LBUTTONDOWN: button = MouseButtons.Left; clickCount = 1; if (MouseDownEvent != null) MouseDownEvent(this, new MouseEventArgs(button, clickCount, point.X, point.Y, 0)); break; case WM_RBUTTONDOWN: button = MouseButtons.Right; clickCount = 1; if (MouseDownEvent != null) MouseDownEvent(this, new MouseEventArgs(button, clickCount, point.X, point.Y, 0)); break; case WM_MBUTTONDOWN: button = MouseButtons.Middle; clickCount = 1; if (MouseDownEvent != null) MouseDownEvent(this, new MouseEventArgs(button, clickCount, point.X, point.Y, 0)); break; case WM_LBUTTONUP: button = MouseButtons.Left; clickCount = 1; if (MouseUpEvent != null) MouseUpEvent(this, new MouseEventArgs(button, clickCount, point.X, point.Y, 0)); break; case WM_RBUTTONUP: button = MouseButtons.Right; clickCount = 1; if (MouseUpEvent != null) MouseUpEvent(this, new MouseEventArgs(button, clickCount, point.X, point.Y, 0)); break; case WM_MBUTTONUP: button = MouseButtons.Middle; clickCount = 1; if (MouseUpEvent != null) MouseUpEvent(this, new MouseEventArgs(button, clickCount, point.X, point.Y, 0)); break; case WM_MOUSEWHEEL: int data = GET_WHEEL_DELTA_WPARAM(lParam.ToInt32()); MSLLHOOKSTRUCT mouseData = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT)); int wheelMovement = GET_WHEEL_DELTA_WPARAM(mouseData.mouseData); Console.WriteLine("out" + wheelMovement.ToString()); // int zDelta = GET_WHEEL_DELTA_WPARAM(wParam); if (MousescrollEvent != null) MousescrollEvent(this, new ScrollEventArgs(ScrollEventType.SmallDecrement, wheelMovement)); break; default: Console.WriteLine(((Int32)lParam).ToString()); break; } var e = new MouseEventArgs(button, clickCount, point.X, point.Y, 0); MouseClickEvent(this, e); } this.Point = new Point(MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y); return Win32Api.CallNextHookEx(hHook, nCode, wParam, lParam); } } [StructLayout(LayoutKind.Sequential)] private struct MSLLHOOKSTRUCT { public Point pt; public int mouseData; public int flags; public int time; public long dwExtraInfo; } private static int GET_WHEEL_DELTA_WPARAM(int wparam) { return (int)(wparam >> 16); } public delegate void MouseMoveHandler(object sender, MouseEventArgs e); public event MouseMoveHandler MouseMoveEvent; public delegate void MouseClickHandler(object sender, MouseEventArgs e); public event MouseClickHandler MouseClickEvent; public delegate void MouseDownHandler(object sender, MouseEventArgs e); public event MouseDownHandler MouseDownEvent; public delegate void MouseUpHandler(object sender, MouseEventArgs e); public event MouseUpHandler MouseUpEvent; public delegate void MousescrollHandler(object sender, ScrollEventArgs e); public event MousescrollHandler MousescrollEvent; // public delegate void MouseUpHandler(object sender, MouseEventArgs e); //public event MouseUpHandler Mow; }