C# 实现局域网的windows环境下的桌面分享

先谈需求，本demo源于实验室的师兄们找工作的时候，针对有些公司会监视多屏幕的情况，突发奇想自己写了一个小demo来分享屏幕，随手写的使用价值不大～在本机测试效果不错，但是跨机效果很一般，不知道是不是路由器的问题。另没有对接收发送的数据进行校验，只是比较基础的实现。为什么说是局域网，因为数据传输效果太糟糕，理论远程也是可以的，没有试。只贴出了处理代码，界面代码和编译后的结果我上传github了，可以查看

服务器代码：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Windows.Forms;
using System.Drawing;
using System.IO;namespace screen_server
{class Server{private string localIP;private Bitmap screenNow;private string[] terminalList;private int listenPort;private int screenHeight;private int screenWidth;private bool isWork;private byte[] buffer;private string errorMessage;private Socket server;public Server(int listenPort){screenWidth  = Screen.PrimaryScreen.Bounds.Width;screenHeight = Screen.PrimaryScreen.Bounds.Height;ScreenNow = new Bitmap(screenWidth, screenHeight);IsWork = false;this.listenPort = listenPort;//获取本地ip地址try{string HostName = Dns.GetHostName(); //得到主机名IPHostEntry IpEntry = Dns.GetHostEntry(HostName);for (int i = 0; i < IpEntry.AddressList.Length; i++){if (IpEntry.AddressList[i].AddressFamily == AddressFamily.InterNetwork){//限制了实验室网段或者学校内网if (IpEntry.AddressList[i].ToString().Contains("192.168.199") || IpEntry.AddressList[i].ToString().Contains("114.213")){LocalIP = IpEntry.AddressList[i].ToString();break;}}}if (LocalIP == null)LocalIP = "";}catch (Exception ex){errorMessage =  ex.Message;showErrorMessage();}}public string[] TerminalList { get => terminalList; set => terminalList = value; }public string LocalIP { get => localIP; set => localIP = value; }public Bitmap ScreenNow { get => screenNow; set => screenNow = value; }public bool IsWork { get => isWork; set => isWork = value; }public void showErrorMessage(){}public void startService(){server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);IPAddress ip = IPAddress.Parse(LocalIP);server.Bind(new IPEndPoint(ip, listenPort));server.Listen(10);Thread myThread = new Thread(ListenClientConnect);myThread.Start();Thread catchScreen = new Thread(screenUpdate);catchScreen.Start();IsWork = true;}private void ListenClientConnect(){while (true){Socket client = server.Accept();Thread sendThread = new Thread(sendPic);sendThread.Start(client);}}private void screenUpdate(){Bitmap temp = new Bitmap(screenWidth, screenHeight);Graphics gc = Graphics.FromImage(temp);while (true){gc.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(screenWidth, screenHeight));imgtoBytes(temp);screenNow = new Bitmap(temp);GC.Collect();Thread.Sleep(500);}}private void imgtoBytes(Bitmap bitmap){MemoryStream ms = new MemoryStream();bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);buffer = ms.GetBuffer();ms.Close();}private void sendPic(object clientSocket){Socket client = (Socket)clientSocket;byte[] receiveBuffer = new byte[1024];byte[] imageCopy;while (true){try{//客户端返回确认后才发送新的数据int receiveLength = client.Receive(receiveBuffer);imageCopy = new byte[buffer.Length];Buffer.BlockCopy(buffer, 0, imageCopy, 0, buffer.Length);byte[] dataLength = BitConverter.GetBytes(imageCopy.Length);client.Send(dataLength);receiveLength = client.Receive(receiveBuffer);client.Send(imageCopy);}catch{//do Nothing,just break}}}}
}

客户端代码：

using System;
using System.Drawing;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Windows.Forms;namespace screenClient
{public partial class clientWin : Form{public clientWin(){InitializeComponent();}private void startButton_Click(object sender, EventArgs e){string ipPort = configBox.Text;string[] config = ipPort.Split(':');if (config.Length!=2){MessageBox.Show("请输入正确的ip和端口号!");return;}string IP = config[0];int port = Convert.ToInt32(config[1]);try{IPAddress ip = IPAddress.Parse(IP);Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);clientSocket.Connect(new IPEndPoint(ip, port));Thread imageUpdate = new Thread(update);imageUpdate.Start(clientSocket);}catch (Exception ex){MessageBox.Show("建立连接失败，请重试！");}}private void update(object clientSocket){Socket client = (Socket)clientSocket;int receiveNumber;byte[] buffer;byte[] image;while (true){//先发送一个确认连接包buffer = new byte[1];buffer[0] = 1;client.Send(buffer);//先记录数据的大小，再申请对应大小的缓冲区buffer = new byte[4];receiveNumber = client.Receive(buffer);int dataLength =  BitConverter.ToInt32(buffer, 0);client.Send(buffer);buffer = new byte[4096];image = new byte[dataLength];GC.Collect();int offset = 0;while (offset != dataLength){receiveNumber = client.Receive(buffer);Buffer.BlockCopy(buffer, 0, image, offset, receiveNumber);offset += receiveNumber;}pictureBox.Image = getBitmap(image);}}private Bitmap getBitmap(byte[] bytesData){MemoryStream ms1 = new MemoryStream(bytesData);Bitmap bm = (Bitmap)Image.FromStream(ms1);ms1.Close();return bm;}}
}

使用方式：
首先打开服务器端，填入端口号（建议10000～65534），然后点击监听端口按钮（这个时候会给出本机ip，但我限定了局域网192.168.199和114.213前缀，可自行查询ip或者修改代码），再启动服务即可。提供了浏览功能～客户端填入ip地址和端口号即可。

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C# 实现局域网的windows环境下的桌面分享

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