C# 拦截鼠标消息，edata有新招。（没有经过测试）

        //拦截鼠标消息，edata有新招。
        public class TestMessageFilter : IMessageFilter
        {
            internal Form1 _Window { get; set; } = null;
            const int WM_MOUSEMOVE = 0x200;
            public bool PreFilterMessage(ref Message m)
            {
                if (m.Msg == WM_MOUSEMOVE)
                {
                    if (_Window != null)
                    {
                        _Window.Text = "移动" + Cursor.Position.X.ToString() + "," + Cursor.Position.Y.ToString();
                    }
                    // return true;
                    return false;
                }
                return false;
            }
        }
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
                TestMessageFilter t1 = new TestMessageFilter();
                t1._Window = this;
                Application.AddMessageFilter(t1);
            }
        }
// if (g_MsgFilter != null)
// {
//     Application.RemoveMessageFilter(g_MsgFilter);
//     g_MsgFilter = null;
// }