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;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 服务端
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){Control.CheckForIllegalCrossThreadCalls = false;}/// <summary>/// 获取本机IP地址/// </summary>/// <returns>返回一个IP</returns>private string GetIpAddress(){string hostName = Dns.GetHostName();//获取本机名IPHostEntry localhost = Dns.GetHostByName(hostName);//方法已过期了，只能得到一个IPV4的地址
            IPAddress localaddr = localhost.AddressList[0];return localaddr.ToString();}private void btnStart_Click(object sender, EventArgs e){try{//当点击开始监听时，在服务器端创建一个负责监听IP地址和端口号的Socket//IP V4,流式服务，TCP协议Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);IPAddress ip = IPAddress.Any;  //IPAddress.Parse(txtServer.Text);我的理解是获取本机IPtxtServer.Text = GetIpAddress();//将IP地址给文本//创建端口号对象IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));//监听
                socketWatch.Bind(point);ShowMsg("监听成功");socketWatch.Listen(10);//一次监听10 人///创建一个线程来监听，否则没监听时就卡死了Thread th = new Thread(Listen);th.IsBackground = true;th.Start(socketWatch);}catch { }}Dictionary<string, Socket> dicSock = new Dictionary<string, Socket>();//创建键值对来存放IP和socket
        Socket socketSend;void Listen(object o)//必须用object类型 ，因为线程要使用
        {Socket socketWatch = o as Socket;//将传递过来的参数转换为Socket类型while (true){try{//等待客户端的连接 并且创建一个负责通信的SocketsocketSend = socketWatch.Accept();//获得远端 IP+端口号：连接成功ShowMsg(socketSend.RemoteEndPoint.ToString() + ":" + "连接成功");dicSock.Add(socketSend.RemoteEndPoint.ToString(), socketSend);//将IP地址添加到下拉列表中
                    comboBox1.Items.Add(socketSend.RemoteEndPoint.ToString());Thread th = new Thread(ReciveMsg);//在线程中只写方法名，括号和里面的参数不写在这里th.IsBackground = true;//写为后台线程，这样关闭窗口时线程就关闭了，否则关闭不了，会报错
                    th.Start(socketSend);}catch{ }}}/// <summary>/// 用来接收客户端发送来的信息，线程来调用他/// </summary>/// <param name="o"></param>void ReciveMsg(object o){Socket socketSend = o as Socket;while (true){try{//连接成功之后，客户端就要给服务端发送数据了byte[] buffer = new byte[1024 * 1024 * 2];int r = socketSend.Receive(buffer);//实际接收到的有效字符if (r == 0){break;}string str = Encoding.UTF8.GetString(buffer, 0, r);ShowMsg(socketSend.RemoteEndPoint + ":" + str);}catch { }}}/// <summary>/// 在上面一个文本框中显示信息的方法/// </summary>/// <param name="str"></param>void ShowMsg(string str){txtLOg.AppendText(str + "\r\n");//写AppendText追加，不然会覆盖
        }/// <summary>/// 服务端给客户端发送消息/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void button4_Click(object sender, EventArgs e){try{if (comboBox1.Text == ""){MessageBox.Show("请选中一个客户端地址再发送消息", "谢谢");}string str = textBox4.Text;textBox4.Clear();byte[] buffer = System.Text.Encoding.UTF8.GetBytes(str);List<byte> list = new List<byte>();list.Add(0);list.AddRange(buffer);byte[] newbuffer = list.ToArray();string ip = comboBox1.SelectedItem.ToString();dicSock[ip].Send(newbuffer);//通过键IP地址找到值socketSend //socketSend.Send(buffer);
            }catch{ }}private void button2_Click(object sender, EventArgs e){if (comboBox1.Text == ""){MessageBox.Show("请选择一个客户端IP地址再选择要发送的文件", "提示！");}else{OpenFileDialog ofd = new OpenFileDialog();ofd.Title = "请选择要发送的文件";ofd.InitialDirectory = @"C:\Users\Administrator\Desktop";ofd.Filter = "所有文件|*.*";ofd.ShowDialog();textBox5.Text = ofd.FileName;//获得选中的一个文件名
            }}/// <summary>/// 发送文件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void button3_Click(object sender, EventArgs e){try{//发送文件string path = textBox5.Text;using (FileStream fsRead = new FileStream(path, FileMode.Open, FileAccess.Read)){byte[] buffer = new byte[1024 * 1024 * 5];int r = fsRead.Read(buffer, 0, buffer.Length);List<byte> list = new List<byte>();list.Add(1);list.AddRange(buffer);byte[] newbuffer = list.ToArray();//int r= fsRead.Read(newbuffer , 0, newbuffer.Length);//实际读取的有效字节dicSock[comboBox1.SelectedItem.ToString()].Send(newbuffer, 0, r + 1, SocketFlags.None);}}catch { }}///让客户端震动private void button5_Click(object sender, EventArgs e){try{if (comboBox1.Text == ""){MessageBox.Show("请选择一个客户端IP地址再震动", "提示！");}else{byte[] buffer = new byte[1];buffer[0] = 2;dicSock[comboBox1.SelectedItem.ToString()].Send(buffer);}}catch { }}}
}

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;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 客户端
{public partial class Form1 : Form{public Form1(){InitializeComponent();}Socket socketConnect = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);private void button1_Click(object sender, EventArgs e){try{//建立负责通讯的Socketif (textBox1.Text == "" || textBox2.Text == ""){MessageBox.Show("IP地址或者端口号不能为空", "去你大爷的！");}IPAddress ip = IPAddress.Parse(textBox1.Text);IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(textBox2.Text));socketConnect.Connect(point);ShowMsg("连接成功");Thread th = new Thread(Receive);th.IsBackground = true;th.Start();}catch { }}void ShowMsg(string str){textBox3.AppendText(str + "\r\n");}private void button2_Click(object sender, EventArgs e){try{//客户端要给服务器发送消息string str = textBox4.Text.Trim();//Trim()就是把所写内容前后空格去除byte[] buffer = Encoding.UTF8.GetBytes(str);//System.Text.Encoding.UTF8.GetBytes(str);
                socketConnect.Send(buffer);textBox4.Clear();}catch { }}///写一个不断接收服务端发过来的消息的方法，创建线程来调用他void Receive(){try{while (true)//不停的接收
                {byte[] buffer = new byte[1024 * 1024 * 3];int r = socketConnect.Receive(buffer);//实际接收到的有效字节数if (r == 0){break;}if (buffer[0] == 0)//接收到文字
                    {string str = Encoding.UTF8.GetString(buffer, 1, r - 1);ShowMsg(socketConnect.RemoteEndPoint + ":" + str);}else if (buffer[0] == 1){//接收的是文件SaveFileDialog ofd = new SaveFileDialog();//保存对话框
ofd.Title = "请选择保存文件的路径";ofd.InitialDirectory = @"C:\Users\Administrator\Desktop";ofd.Filter = "所有文件|*.*";ofd.ShowDialog(this);string path = ofd.FileName;using (FileStream fsWrite = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)){fsWrite.Write(buffer, 1, r - 1);}MessageBox.Show("保存成功", "kao");}else if(buffer [0]==2){ZD();}}}catch { }}
/// <summary>
/// 写个方法来使窗体震动
/// </summary>void ZD(){for (int i = 0; i < 500; i++){this.Location = new Point(200 , 200);this.Location = new Point(280 , 280);}}private void Form1_Load(object sender, EventArgs e){Control.CheckForIllegalCrossThreadCalls = false;}}
}