How to track the position of the mouse X / Y and print on the label?

Question

I know how to change the cursor position from examples on MSDN.

My question is how to check the position of the mouse while moving the mouse, and then print the X and Y positions to represent the labels?

EDIT: Suppose I want to track the position of the mouse from across the screen.

EDIT 2: My application will be on the back / minimized.

I already use Mouse Hooks:

namespace Program { public partial class MouseHook { [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] private static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr dwExtraInfo); private const int MOUSEEVENTF_LEFTDOWN = 0x02; private const int MOUSEEVENTF_LEFTUP = 0x04; private const int MOUSEEVENTF_RIGHTDOWN = 0x08; private const int MOUSEEVENTF_RIGHTUP = 0x10; public void DoMouseClick() { int X = Cursor.Position.X; int Y = Cursor.Position.Y; IntPtr newP = new IntPtr(Convert.ToInt64("0", 16)); mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, newP); } } } 

Answer 1

Here is the msdn documentation for system level event processing calls (low level mouse processing).

Here's an example of using low mouse-level handles to change a scroll event.

In the answer in the second link, use WM_MOUSEMOVE from here instead of WM_MOUSEWHEEL.

It should be noted: in order for this program to continue to capture mouse events when the mouse is over an elevated program, this program must be run with elevated privileges.

Code (not verified):

 using System; using System.Diagnostics; using System.Windows.Forms; using System.Runtime.InteropServices; namespace CatchMouseMove { class InterceptMouse { const int INPUT_MOUSE = 0; const int MOUSEEVENTF_WHEEL = 0x0800; const int WH_MOUSE_LL = 14; private static LowLevelMouseProc _proc = HookCallback; private static IntPtr _hookID = IntPtr.Zero; public static void Main() { _hookID = SetHook(_proc); if (_hookID == null) { MessageBox.Show("SetWindowsHookEx Failed"); return; } Application.Run(); 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) { int xPos = 0; int yPos = 0; if (nCode >= 0 && MouseMessages.WM_MOUSEMOVE == (MouseMessages)wParam) { xPos = GET_X_LPARAM(lParam); yPos = GET_Y_LPARAM(lParam); //do stuff with xPos and yPos } return CallNextHookEx(_hookID, nCode, wParam, lParam); } private enum MouseMessages { WM_MOUSEMOVE = 0x0200 } [StructLayout(LayoutKind.Sequential)] private struct POINT { public int x; public int y; } [StructLayout(LayoutKind.Sequential)] private struct MSLLHOOKSTRUCT { public POINT pt; public int mouseData; public int flags; public int time; public IntPtr dwExtraInfo; } public struct INPUT { public int type; public MOUSEINPUT mi; } [StructLayout(LayoutKind.Sequential)] public struct MOUSEINPUT { public int dx; public int dy; public int mouseData; public uint dwFlags; public int time; public int 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); } } 

Answer 2

To achieve this, you need to install the Windows hook. MSDN article How to Install a Windows Hook in Visual C # .NET Shows How to Install a Mouse Hook.

I tried, it captures the mouse all over the form, even when the mouse cursor is over the control.

Answer 3

You can use the EventArgs of the MouseMove event because it contains the coordinates of the mouse. From there, you can easily set the text property of the label to the X or Y coordinate that you take from e (MouseMove EventArgs).

 private void Form_MouseMove(object sender, MouseEventArgs e) { // Update the mouse coordinates displayed in the textbox. myTextBox.Text = e.Location.ToString(); }