簡介：

       本章節主要討論了Socket的入門知識，還未針對Socket的難點問題（比如TCP的無訊息邊界問題）展開討論，往後在其他章節中進行研究。

注意點：

伺服器（比如臺式電腦）的IP為1.1.1.2，那麼客戶端（其他裝置，比如手機，Ipad）連線的一定是伺服器的IP，即也是1.1.1.2。這樣才能建立起握手：

基礎知識架構：

例子：

伺服器code:

using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Diagnostics;
//伺服器程式
namespace SocketServer
{
    class Program
    {
        private static byte[] result = new Byte[1024];
        private static int myprot = 8888;
        static Socket serverSocket;
        static void Main(string[] args)
        {
            //伺服器IP地址
            //IPAddress ip = IPAddress.Parse("127.0.0.1");
            IPAddress ip = IPAddress.Parse("1.1.1.2");
            serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream,ProtocolType.Tcp);
            serverSocket.Bind(new IPEndPoint(ip, myprot));
            serverSocket.Listen(10);
            Console.WriteLine("啟動監聽{0}成功", serverSocket.LocalEndPoint.ToString());
            //通過clientsocket傳送資料
            Thread myThread = new Thread(ListenClientConnect);
            myThread.Start();
            Console.ReadLine();
        }
        /// <summary>
        /// 接收連線
        /// </summary>
        private static void ListenClientConnect()
        {
            while (true)
            {
                Socket clientsocket = serverSocket.Accept();
                clientsocket.Send(Encoding.ASCII.GetBytes("Server Say Hello"));
                Thread receiveThread = new Thread(ReceiveMessage);
                receiveThread.Start(clientsocket);
            }
        }
        /// <summary>
        /// 接收資訊
        /// </summary>
        /// <param name="clientSocket">包含客戶機資訊的套接字</param>
        private static void ReceiveMessage(Object clientSocket)
        {
            Socket myClientSocket = (Socket)clientSocket;
            while (true)
            {
                try
                {
                    //通過clientsocket接收資料
                    int receiveNumber = myClientSocket.Receive(result);
                    Console.WriteLine("接收客戶端{0}訊息{1}",myClientSocket.RemoteEndPoint.ToString(), Encoding.ASCII.GetString(result, 0, receiveNumber));
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                    myClientSocket.Shutdown(SocketShutdown.Both);
                    myClientSocket.Close();
                    break;
                }
            }
        }
    }
}
 

客戶端code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
//客戶端程式
namespace SocketClient
{
    class Program
    {
        private static byte[] result = new Byte[1024];
        static void Main(string[] args)
        {
            //伺服器IP地址
            //IPAddress ip = IPAddress.Parse("127.0.0.1");
            IPAddress ip = IPAddress.Parse("1.1.1.2");
            Socket clientSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
            try
            {
                clientSocket.Connect(new IPEndPoint(ip, 8888));
                Console.WriteLine("連線伺服器成功");
                
            }
            catch
            {
                Console.WriteLine("連線伺服器失敗,請按回車鍵退出");
                Console.Read();
                return;
            }
            //通過clientSocket接收資料
            int receiveLength = clientSocket.Receive(result);
            Console.WriteLine("接收伺服器訊息：{0}",Encoding.ASCII.GetString(result, 0, receiveLength));
            // 通過clientSocket傳送資料
            for (int i = 0; i < 15; i++)
            {
                try
                {
                    Thread.Sleep(1000);
                    string sendMessage = "client send Message Hello" + DateTime.Now;
                    clientSocket.Send(Encoding.ASCII.GetBytes(sendMessage));
                    Console.WriteLine("向伺服器傳送訊息:{0}", sendMessage);
                }
                catch
                {
                    clientSocket.Shutdown(SocketShutdown.Both);
                    clientSocket.Close();
                    break;
                }
            }
            Console.WriteLine("傳送完畢，按回車鍵退出");
            Console.ReadKey();
        }
    }
}
 

總結:

一、例程中傳送的是字串，往後將傳送圖片。

二、往後將建立基於WPF的工程專案。