仿迅雷客户端的浏览器自定义协议的小程序

上家公司有这样的一个需求：

在网页中点一个链接，启动我们自己的一个客户端程序，并接受链接传递过来的参数，在客户端做相应的处理

1。自定义浏览器协议

     只要给注册表写进去一点信息就可以实现将自己定义的协议（如：mylink://）跟某客户端程序关联，google一下就可以了

2.只能让这个客户端运行一个实例

 static void Main(string[] url)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            if (url != null && url.Length > 0)
            {
                if (CreateMutex())
                {
                    form = new MainForm(url[0]);
                    Application.Run(form);
                    ReleaseMutex(); 
                }
                else
                {
                    int hd = FindWindow(null, "自定义浏览器协议");
                    if (hd == 0)
                    {
                        throw new Exception("Could   not   find   Main   window!");
                    }
                    byte[] sarr = System.Text.Encoding.Default.GetBytes(url[0]);
                    int len = sarr.Length;
                    COPYDATASTRUCT cds;
                    cds.dwData = (IntPtr)100;
                    cds.lpData = url[0];
                    cds.cbData = len + 1;
                    SendMessage(hd, 0x004A, 0, ref cds);
                }
            }
            else
            {
                if (CreateMutex())
                {
                    form = new MainForm();
                    Application.Run(form);
                    ReleaseMutex();
                }
                else
                {
                    MessageBox.Show("该程序只能运行一个实例!");
                }
            }
        }

        public static bool CreateMutex()
        {
            bool result = false;
            mutex = new Mutex(true, Assembly.GetEntryAssembly().FullName, out result);
            return result; 
        }

        public static void ReleaseMutex()
        {
            if (mutex != null)
            {
                mutex.Close();
            }
        }

3.消息传递   用windows的消息机制

        /// <summary>
        /// 该结构用来定义用户封装的数据
        /// </summary> 
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

       

        /// <summary>
        /// 消息处理
        /// </summary>
        /// <param name="m">消息</param>
        protected override void DefWndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x004A:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    mystr = (COPYDATASTRUCT)m.GetLParam(mytype);
                    WebBrowserNavigatingEventArgs e = new WebBrowserNavigatingEventArgs(new Uri(mystr.lpData.ToString()), "");
                    OnNavigate(null, e);
                    break;
                default:
                    base.DefWndProc(ref   m);
                    break;
            }
        }

http://www.cnblogs.com/CharlieSong/archive/2009/04/04/1429464.html