using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Server
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            lab_pro.Text = "接收:0/100";  
        }
        /// <summary>
        /// 开启服务
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Text = "监听中...";
            button1.Enabled = false;
            Socket receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint hostIpEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.100"), 121);

            //设置接收数据缓冲区的大小
            byte[] b = new byte[4096];
            receiveSocket.Bind(hostIpEndPoint);
            //监听
            receiveSocket.Listen(2);
            //接受客户端连接
            Socket hostSocket = receiveSocket.Accept();
            //如何确定该数组大小
            MemoryStream fs = new MemoryStream();

            int length = 0;
            //每次只能读取小于等于缓冲区的大小
            while ((length = hostSocket.Receive(b)) > 0)
            {
                fs.Write(b, 0, length);

                if (progressBar1.Value <100)
                {
                    progressBar1.Value++;
                    lab_pro.Text = "接收:" + progressBar1.Value + "/100";
                }
                
            }
            progressBar1.Value = 100;
            lab_pro.Text = "接收:" + progressBar1.Value + "/100";
            fs.Flush();
            Bitmap Img = new Bitmap(fs);
            Img.Save(@"reveive.jpg", ImageFormat.Png);

            //关闭写文件流
            fs.Close();
            //关闭接收数据的Socket
            hostSocket.Shutdown(SocketShutdown.Receive);
            hostSocket.Close();
            //关闭发送连接
            receiveSocket.Close();
          
        }    
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        static Socket sendsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        OpenFileDialog openFileDialog1 = new OpenFileDialog();
        Byte[] imgByte = new byte[1024];

        /// <summary>
        /// 打开本地文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btm_scane_Click(object sender, EventArgs e)
        {
            this.openFileDialog1.Filter  = "Image Files(*.BMP;*.JPG;*.GIF;*.PNG)|*.BMP;*.JPG;*.GIF;*.PNG" +"|All Files (*.*)|*.*";
            if (this.openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    string path = this.openFileDialog1.FileName;
                    lab_path.Text = path;
                    FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
                    imgByte = new Byte[fs.Length];
                    fs.Read(imgByte, 0, imgByte.Length);
                    fs.Close();
                }
                catch (Exception)
                {
                }
            }
        }
       /// <summary>
       /// 向服务器发送数据
       /// </summary>
       /// <param name="sender"></param>
       /// <param name="e"></param>
        private void btn_send_Click(object sender, EventArgs e)
        {
           
            //实例化socket        
            IPEndPoint ipendpiont = new IPEndPoint(IPAddress.Parse("192.168.1.100"), 121);
            sendsocket.Connect(ipendpiont);
            MessageBox.Show("服务器IP:"+sendsocket.RemoteEndPoint);
            sendsocket.Send(imgByte);
            sendsocket.Shutdown(System.Net.Sockets.SocketShutdown.Send);
            sendsocket.Close();
            sendsocket.Dispose();
        }
    }
}