C#上位机之—WinForm实现Socket异步通讯示例

工作中常用到的一些知识点，总是用完就忘，第一次尝试用博客记录下来，以备后用；

socket通讯，socket（套接字）是基于tcp/ip通讯方式的封装好的类，调用时需要添加下面的服务引用：

.......
10 using system.net;
11 using system.net.sockets;

窗体页面搭建，上面为服务器区，下面为客户端区：

建立两个类，一个表示服务器，一个表示客户端，

首先建立服务器类：

1.声明变量：ip地址，端口号，endpoint，socket类，数据buffer等

 1         string ip;//ip地址
 2         string port;//端口号
 3         ipendpoint endpoint;//网络端点
 4         socket socserver;//侦听连接套接字
 5         socket socclient;//通讯套接字
 6         byte[] datareceived = new byte[50000];
 7 
 8         public delegate void delegatedisplaymsg(string type,string msg);
 9         public delegatedisplaymsg ondisplay;
10 
11         public socketserver()
12         {
13             socserver = new socket(addressfamily.internetwork, sockettype.stream, protocoltype.tcp);
14         }

 

2.侦听连接函数：

       public void startlisten(string ip,string port)
       {
            this.ip = ip;
            this.port = port;
            endpoint = new ipendpoint(ipaddress.parse(this.ip), int.parse(port));
            socserver.bind(endpoint);
            socserver.listen(0);
            socserver.beginaccept(new asynccallback(onclientconnect), null);
            showmsg("wait connect");
        }

3.接受数据函数：

public void onclientconnect(iasyncresult asyn)
        {
            socclient = socserver.endaccept(asyn);
            waitfordata();
            showmsg("client connected  " + socclient.remoteendpoint.tostring());
        }
        public void waitfordata()
        {
            if (socclient != null)
                socclient.beginreceive(datareceived, 0, datareceived.length, socketflags.none, new asynccallback(ondatareceived), null);
        }
        public void ondatareceived(iasyncresult asyn)
        {
            int datalength = socclient.endreceive(asyn);
            byte[] chars = new byte[datalength];
            buffer.blockcopy(datareceived, 0, chars, 0, datalength);
            string msg = encoding.ascii.getstring(chars);
            showmsg("<=" + msg);
            waitfordata();
        }

4.发送数据函数：

        public void sendmsg(string msg)
        {
            byte[] data = encoding.default.getbytes(msg);
            socclient.send(data);
            showmsg("=>" + msg);
        }

然后建立客户端类：

1.声明变量

        string ip;//ip地址
        string port;//端口号
        ipendpoint endpoint;//网络端点
        socket socclient;//通讯套接字
        byte[] datareceived = new byte[50000];//数据buffer

        public delegate void delegatedisplaymsg(string type,string msg);
        public delegatedisplaymsg ondisplay;

        public socketclient()
        {
            socclient = new socket(addressfamily.internetwork, sockettype.stream, protocoltype.tcp);
        }

2.连接服务器函数：

        public void connect(string ip, string port)
        {
            this.ip = ip;
            this.port = port;
            endpoint = new ipendpoint(ipaddress.parse(this.ip), int.parse(port));
            socclient.beginconnect(endpoint, new asynccallback(ontoconnected), null);
        }

3.接受数据函数：

        public void ontoconnected(iasyncresult asyn)
        {
            socclient.endconnect(asyn);
            waitfordata();
            showmsg("connect success");
        }
        public void waitfordata()
        {
            if (socclient != null)
                socclient.beginreceive(datareceived, 0, datareceived.length, socketflags.none, new asynccallback(ondatareceived), null);
        }
        public void ondatareceived(iasyncresult asyn)
        {
            int datalenth = socclient.endreceive(asyn);
            byte[] chars = new byte[datalenth];
            buffer.blockcopy(datareceived, 0, chars, 0, datalenth);
            string msg = encoding.ascii.getstring(chars);
            showmsg("<=" + msg);
            waitfordata();
        }

4.发送数据函数：

        public void sendmsg(string msg)
        {
            byte[] data = encoding.default.getbytes(msg);
            socclient.send(data);
            showmsg("=>" + msg);
        }

服务器类与客户端类，已经建立完成，下面对两个类进行实例化，并link窗体控件的事件函数，如下：

1.实例化：

        public void init()
        {
            server = new socketserver();
            client = new socketclient();
            server.ondisplay += showmsg;
            client.ondisplay += showmsg;
        }

2.按钮点击事件：

        private void btn_startlisten_click(object sender, eventargs e)
        {
            server.startlisten(txt_serverip.text.tostring(), txt_serverport.text.tostring());
            btn_startlisten.backcolor = color.limegreen;
        }

        private void btn_connect_click(object sender, eventargs e)
        {
            client.connect(txt_clientip.text.tostring(), txt_clientport.text.tostring());
        }

        private void btn_serversend_click(object sender, eventargs e)
        {
            button b = (button)sender;
            bool isserver = b.name.contains("server");
            if (isserver)
                server.sendmsg(txt_servermsg.text.tostring());
            else
                client.sendmsg(txt_clientmsg.text.tostring());
        }

现在启动程序，测试发送接收功能是否正常

至此，一个简单的socket通讯模型已经完成，实际应用中还需考虑通讯异常，通讯协议，多个客户端通讯等事项，第一次写博，欢迎大家多多指正；