如何捕获鼠标移动事件

Question

我想捕获我的主窗体中的鼠标移动事件。尽管我可以为主窗体连接MouseEventHandler，但当光标位于UserControl或其他任何控件上时，事件不再触发。我如何确保我始终拥有鼠标位置。

Answer 1

您可以使用低级别的鼠标钩子。请参阅this示例，并检查HookCallback中的WM_MOUSEMOVE消息。

您也可以使用IMessageFilter类抓老鼠事件和触发事件，以获得位置（注意：这只会位置在窗口，它不是外面）：

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 
    } 
} 

Answer 2

这是解决方案。尽管我可以用类似的方法看到另一个答案。但是自从我写了它以后，我想发布它。这里MouseMessageFilter有一个静态事件调用MouseMove，你可以从应用程序中的任何地方订阅。

static class Program 
{ 
    [STAThread] 
    static void Main() { 
     Application.EnableVisualStyles(); 
     Application.SetCompatibleTextRenderingDefault(false);    
     Application.AddMessageFilter(new MouseMessageFilter()); 
     MouseMessageFilter.MouseMove += new MouseEventHandler(OnGlobalMouseMove); 

     Application.Run(new MainForm()); 
    } 

    static void OnGlobalMouseMove(object sender, MouseEventArgs e) { 
     Console.WriteLine(e.Location.ToString()); 
    } 
} 

class MouseMessageFilter : IMessageFilter 
{ 
    public static event MouseEventHandler MouseMove = delegate { }; 
    const int WM_MOUSEMOVE = 0x0200; 

    public bool PreFilterMessage(ref Message m) { 

     if (m.Msg == WM_MOUSEMOVE) { 

      Point mousePosition = Control.MousePosition; 

      MouseMove(null, new MouseEventArgs(
       MouseButtons.None, 0, mousePosition.X, mousePosition.Y,0)); 
     }  
     return false; 
    } 
} 

Answer 3

public partial class frmCaptureMouse : Form 
{ 
    [DllImport("user32.dll")] 
    static extern IntPtr SetCapture(IntPtr hWnd); 

    public frmCaptureMouse() 
    { 
     InitializeComponent(); 
    } 

    private void frmCaptureMouse_MouseMove(object sender, MouseEventArgs e) 
    { 
     try 
     { 
      lblCoords.Text = e.Location.X.ToString() + ", " + e.Location.Y.ToString(); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 
    } 

    private void btnCapture_Click(object sender, EventArgs e) 
    { 
     try 
     { 
      SetCapture(this.Handle); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 
    } 
} 

Answer 4

我试图通过@ SwDevMan81提供上述solutoution。虽然它的效果很好，但我也遇到了@Randy Gamage的问题，“即使鼠标没有移动，MouseMoved函数也会被连续调用，当鼠标不在应用程序时它会停止触发。 在这无论如何是我想出了：

在窗体的构造函数：

​​

的事件处理程序：

private void GlobalMouseHandler_MouseMovedEvent(object sender, MouseEventArgs e) 
{ 
    try 
    { 
     //Do whatever ... 
    } 
    catch { } 
} 

而且我稍微改变GlobalMouseHandler类：

public class GlobalMouseHandler : IMessageFilter 
{ 
    private const int WM_MOUSEMOVE = 0x0200; 
    private System.Drawing.Point previousMousePosition = new System.Drawing.Point(); 
    public static event EventHandler<MouseEventArgs> MouseMovedEvent = delegate { }; 

    #region IMessageFilter Members 

    public bool PreFilterMessage(ref System.Windows.Forms.Message m) 
    { 
     if (m.Msg == WM_MOUSEMOVE) 
     { 
      System.Drawing.Point currentMousePoint = Control.MousePosition; 
      if (previousMousePosition != currentMousePoint) 
      { 
       previousMousePosition = currentMousePoint; 
       MouseMovedEvent(this, new MouseEventArgs(MouseButtons.None, 0, currentMousePoint.X, currentMousePoint.Y, 0)); 
      } 
     } 
     // Always allow message to continue to the next filter control 
     return false; 
    } 

    #endregion 
} 

我希望有人可以使用它。