基於訊息驅動的C#Windows程式

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        const int WM_Lbutton = 0x201; //定義了滑鼠的左鍵點擊訊息
        const int WM_RBUTTONDOWN = 0x204;//定義滑鼠右鍵
        const int WM_KEYDOWN = 0x100;

        public const int USER = 0x0400;// 是windows系統定義的使用者訊息

        [DllImport("User32.dll", EntryPoint = "SendMessage")]

        private static extern int SendMessage(

               int hWnd,　　　// handle to destination window

               int Msg,　　　 // message

               int wParam,　// first message parameter

               int lParam // second message parameter

         );

        protected override void DefWndProc(ref System.Windows.Forms.Message m)
        {
            string message = "";

            switch (m.Msg)
            {
                case WM_Lbutton:
                    ///string與MFC中的CString的Format函數的使用方法有所不同
                    message = string.Format("收到訊息!參數為:{0},{1}", m.WParam, m.LParam);
                    MessageBox.Show(message);///顯示一個訊息框
                    break;
                case 0:
                    message = string.Format("收到滑鼠點擊按鈕訊息!參數為:{0},{1}", m.WParam, m.LParam);
                    MessageBox.Show(message);
                    break;
                case WM_RBUTTONDOWN:
                    MessageBox.Show("你按下了滑鼠右鍵!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    break;
                case WM_KEYDOWN:
                    MessageBox.Show("你按下了鍵盤!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    break;
                default:
                    base.DefWndProc(ref m);///調用基類函數處理非自訂訊息。
                    break;
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            System.Windows.Forms.Message m = new Message();
            m.Msg = 0;
            m.LParam = (IntPtr)10;
            m.WParam = (IntPtr)11;
            SendMessage((int)this.Handle, (int)m.Msg, (int)m.WParam, (int)m.LParam);
        } 
    }
}