You could use a low level mouse hook. See this example and check for the WM_MOUSEMOVE mesage in HookCallback.
You could also use the IMessageFilter class to catch the Mouse Events and trigger an event to get the position (note: this will only get the position over the window, not outside of it):
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace GlobalMouseEvents
{
public partial class Form1 : Form
{
public Form1()
{
GlobalMouseHandler gmh = new GlobalMouseHandler();
gmh.TheMouseMoved += new MouseMovedEvent(gmh_TheMouseMoved);
Application.AddMessageFilter(gmh);
InitializeComponent();
}
void gmh_TheMouseMoved()
{
Point cur_pos = System.Windows.Forms.Cursor.Position;
System.Console.WriteLine(cur_pos);
}
}
public delegate void MouseMovedEvent();
public class GlobalMouseHandler : IMessageFilter
{
private const int WM_MOUSEMOVE = 0x0200;
public event MouseMovedEvent TheMouseMoved;
#region IMessageFilter Members
public bool PreFilterMessage(ref Message m)
{
if (m.Msg == WM_MOUSEMOVE)
{
if (TheMouseMoved != null)
{
TheMouseMoved();
}
}
// Always allow message to continue to the next filter control
return false;
}
#endregion
}
}