窗体，控件消息拦截

最新推荐文章于 2022-04-25 00:44:32 发布

原创最新推荐文章于 2022-04-25 00:44:32 发布 · 1.5k 阅读

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#null #user #object #class

本文介绍了如何在Windows窗体应用中实现窗体和控件的消息拦截。通过覆盖WndProc方法，实现了对WM_LBUTTONDOWN等消息的处理，如阻止左键单击响应。同时，展示了如何为特定控件安装消息拦截，以便在接收到WM_LBUTTONDOWN消息时执行自定义操作，以及如何创建一个重载的RichTextBox控件以响应双击事件。

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#region form 窗体消息拦截

const int WM_RBUTTONDOWN = 0x0204; //右键单击

     const int WM_LBUTTONUP = 0x0202;        //左键释放
       const int WM_NCLBUTTONDBLCLK = 0x203; //左键双击
       const int WM_LBUTTONDOWN = 0x0201;     //左键单击

const int WM_QUERYENDSESSION = 0x0011 //关机

            protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                   case WM_LBUTTONDOWN:
                    m.Result = IntPtr.Zero;
                    break;
                default:
                    base.WndProc(ref m);
                    break;
            }
        }

#endregion

#region 控件消息拦截
private const int GWL_WNDPROC = -4;

         [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern IntPtr SetWindowLong(IntPtr hWnd, int nIndex, MyWndProc wndProc);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern IntPtr CallWindowProc(IntPtr wndProc, IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
        public delegate IntPtr MyWndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
        private IntPtr OldWndProc = IntPtr.Zero;
        private MyWndProc Wpr = null;
        private IntPtr MyControlWndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam)
        {
            switch (msg)
            {
                   case WM_LBUTTONDOWN:
                    ButtonOnClick();
                    return (IntPtr)0;
                default:
                    return CallWindowProc(OldWndProc, hWnd, msg, wParam, lParam);
            }
        }

//控件变量名为 XX

        private void InitializeThatControl()
        {
            //初始化的时候安装消息拦截
            this.Wpr = new MyWndProc(this.MyControlWndProc);
            this.OldWndProc = SetWindowLong(XX.Handle, GWL_WNDPROC, Wpr);
        }

//然后在窗体构造函数中加入InitializeThatControl()
#endregion

       #region 重载  控件，添加响应双击事件
        ///   <summary>
        ///   重载   RichTextBox   控件，可以响应双击事件
        ///   </summary>
        public class MyRichTextBox : RichTextBox
        {
            public delegate void DoubleClickHandler(object sender, System.EventArgs e);

public event DoubleClickHandler DoubleClicked;

            protected override void OnDoubleClick(EventArgs e)
            {
                if (DoubleClicked != null)
                    DoubleClicked(this, new System.EventArgs());
            }

            protected override void WndProc(ref   Message m)
            {
                //   鼠标双击
                if (m.Msg == NCLBUTTONDBLCLK )
                {
                    OnDoubleClick(new EventArgs());
                }
                base.WndProc(ref   m);
            }
        }
        #endregion