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   源码介绍

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

namespace Monitor_printer_server
{
    public partial class Form1 : Form
    {
        private IPAddress hostIPAddress ;
        private IPEndPoint Server;
        private Socket listeningSocket;//侦听
        //private Socket mySocket;
        private const int BufferSize = 1024 * 64;//缓冲大小
        private byte[] buffer = new byte[BufferSize];//系统缓冲
        string port;//端品名
        private string adress = Application.StartupPath;//系统开启时的目录
        public struct ser {
            public IntPtr id;
            public FileStream fstr;
            public string FileName;
        }
        public ser[] _sessionTable = new ser[100];

        public Form1()
        
        {
            InitializeComponent();
        }
        /// <summary>
        /// Form1_Load功能：开启程序时读取的信息；
        /// </summary>
        /// <param name="sender">系统自带</param>
        /// <param name="e">系统自带</param>
        private void Form1_Load(object sender, EventArgs e)
        {
            //获取主机的ＩＰ地址；
            IPHostEntry myHost = new IPHostEntry();
            myHost = Dns.GetHostByName(Dns.GetHostName());
            txtServer.Text = myHost.AddressList[0].ToString();
            //判断IP.INI文件是否存在.如果存在启动侦听
            if (File.Exists(adress   "\\ip.ini") == true)
            {
                StreamReader srd = File.OpenText(adress   "\\ip.ini");
                txtServer.Text = srd.ReadLine();
                txtPort.Text = srd.ReadLine();
                srd.Close();
                button1_Click(sender, e);
                button2_Click_1(sender, e);
            }

        }
        /// <summary>
        /// button1_Click功能：开始侦听程序
        /// </summary>
        /// <param name="sender">系统自带</param>
        /// <param name="e">系统自带</param>
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            try
            {

                StreamWriter srd;
                srd = File.CreateText("ip.ini");
                srd.WriteLine(txtServer.Text);
                srd.WriteLine(txtPort.Text);
                srd.Close();
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message);
            }
            try
            {
                hostIPAddress = IPAddress.Parse(txtServer.Text);
                port = txtPort.Text;
            }
            catch
            {
                MessageBox.Show("The IP address was not in a correct format.");
            }
                Server = new IPEndPoint(hostIPAddress, Int32.Parse(port));
                listeningSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                listeningSocket.Bind(Server); //绑定该主机端口
                listeningSocket.Listen(50); //监听端口，等待客户端连接请求。50是队列中最多可容纳的等待接受的传入连接数
                listeningSocket.BeginAccept(new AsyncCallback(AcceptCallBack), listeningSocket);//开始一个异步操作来接受一个传入的连接尝试
                
                //listBox1.Items.Insert(0, "服务器开始侦听");
                button1.Enabled = false;
                启动RToolStripMenuItem.Enabled = false;
            
        }
        /// <summary>
        /// AcceptCallBack功能开始一个异步连接
        /// </summary>
        /// <param name="ar">表示异步操作的状态</param>
        private void AcceptCallBack(IAsyncResult ar)//ar表示异步操作的状态。
        {
            try
            {
                Socket mySocket = (Socket)ar.AsyncState; //获取状态，在这里AsyncState返回的是BeginAccept方法的handler参数
                Socket handler = mySocket.EndAccept(ar);//异步接受传入的连接尝试，并创建新的 Socket 来处理远程主机通信,获取结果
                string year = DateTime.Now.Year.ToString();
                string month = DateTime.Now.Month.ToString();
                string day = DateTime.Now.Day.ToString();
                string hour = DateTime.Now.Hour.ToString();
                string min = DateTime.Now.Minute.ToString();
                string sec = DateTime.Now.Second.ToString();
                string ssec = DateTime.Now.Millisecond.ToString();
                string FileName =adress  "\\pic\\"   year   month   day   hour   min   sec   ssec   ".emf";
                FileStream fstr = new FileStream(FileName, FileMode.Create, FileAccess.Write);
                
                Add(handler.Handle, fstr, FileName);

                handler.BeginReceive(buffer, 0, BufferSize, 0, new AsyncCallback(ReadCallBack), handler);
                listeningSocket.BeginAccept(new AsyncCallback(AcceptCallBack), listeningSocket);//开始一个异步操作来接受一个传入的连接尝试
            }
            catch (Exception ee) {
                //MessageBox.Show("服务器信息AcceptCallBack"   ee.Message);
               
            }
        }
        /// <summary>
        /// FindSession功能查找一个对应的流;
        /// </summary>
        /// <param name="session">一个新建连接的句柄</param>
        /// <returns>返回对应在缓存中的位置</returns>
        private int FindSession(IntPtr session)
        {
            for (int i = 0; i < 100; i  ) {
                
                if (_sessionTable[i].id == session) {
                    return i;
                }
            }
            return 100;
        }

        /// <summary>
        /// Add功能新建一个与客户端的连接
        /// </summary>
        /// <param name="key">新建的句柄</param>
        /// <param name="fstr">对应的流文件</param>
        /// <param name="FileName">对应的文件名</param>
        /// <returns></returns>
        private int Add(IntPtr key, FileStream fstr, string FileName)
        {
            for (int i = 0; i < 100; i  )
            {

                if (_sessionTable[i].id == IntPtr.Zero)
                {
                    _sessionTable[i].id = key;
                    _sessionTable[i].fstr = fstr;
                    _sessionTable[i].FileName = FileName;
                    return　i;
                }
            }
            return 100;
        }

        /// <summary>
        /// ReadCallBack功能程序异步挂起,将客户端传过来的数据保存_sessionTable[key].fstr流中
        /// </summary>
        /// <param name="ar">表示异步操作的状态</param>
        private void ReadCallBack(IAsyncResult ar)
        {
            
            int bytesRead=0,key;
             Socket handler = (Socket)ar.AsyncState;
             key=FindSession(handler.Handle);
            try
            {
                bytesRead = handler.EndReceive(ar); //结束挂起的异步读取,返回接收到的字节数。
                if (bytesRead == 0)
                {
                    /*if (_sessionTable[key].fstr.Length == 0) {
                        _sessionTable[key].fstr.Close();
                        _sessionTable[key].id = IntPtr.Zero;
                        FileInfo a = new FileInfo(_sessionTable[key].FileName);
                        _sessionTable[key].fstr.Close();
                        a.Delete();
                        return;
                   }*/
                        _sessionTable[key].fstr.Close();
                        _sessionTable[key].id = IntPtr.Zero;
                        return;
                }
                else
                {
                    _sessionTable[key].fstr.Write(buffer, 0, bytesRead);
                    
                }
                handler.BeginReceive(buffer, 0, BufferSize, 0, new AsyncCallback(ReadCallBack), handler);
            }
            catch (Exception eee)
            {
                MessageBox.Show("服务器信息："   eee.Message);
                _sessionTable[key].id = IntPtr.Zero;
                FileInfo a = new FileInfo(_sessionTable[key].FileName);
                _sessionTable[key].fstr.Close();
                a.Delete();
                
            }
        }

   
 

        /// <summary>
        /// Form1_FormClosing功能将程序关闭
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            
            this.Dispose();
        }
        /// <summary>
        /// button6_Click功能关闭侦听
        /// </summary>
        /// <param name="sender">系统自带</param>
        /// <param name="e">系统自带</param>
        private void button6_Click(object sender, EventArgs e)
        {

            for (int i = 0; i < 100; i  )
            {
                // _sessionTable[i].
            }
            listeningSocket.Close();

            button1.Enabled = true;
            启动RToolStripMenuItem.Enabled = true;
            // this.Dispose();
        }
        /// <summary>
        /// 显示SToolStripMenuItem_Click功能将程序隐藏掉
        /// </summary>
        /// <param name="sender">系统自带</param>
        /// <param name="e">系统自带</param>
        private void 显示SToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Show();
            this.WindowState = FormWindowState.Normal;

        }
        /// <summary>
        /// button2_Click_1功能将程序隐藏掉
        /// </summary>
        /// <param name="sender">系统自带</param>
        /// <param name="e">系统自带</param>
        private void button2_Click_1(object sender, EventArgs e)
        {
            this.Hide();
            this.WindowState = FormWindowState.Minimized;

        }

        private void 退出EToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }
    }

}