Stream.Read 方法

當(dāng)在派生類中重寫時(shí)，從當(dāng)前流讀取字節(jié)序列，并將此流中的位置提升讀取的字節(jié)數(shù)。

語(yǔ)法：

public abstract int?Read(byte[] buffer,?int?offset,?int?count)

參數(shù)：

• buffer: 字節(jié)數(shù)組。此方法返回時(shí)，該緩沖區(qū)包含指定的字符數(shù)組，該數(shù)組的?offset?和 (offset?+?count?-1) 之間的值由從當(dāng)前源中讀取的字節(jié)替換。

• offset:?buffer?中的從零開始的字節(jié)偏移量，從此處開始存儲(chǔ)從當(dāng)前流中讀取的數(shù)據(jù)。

• count: 要從當(dāng)前流中最多讀取的字節(jié)數(shù)。

返回值：

讀入緩沖區(qū)中的總字節(jié)數(shù)。如果當(dāng)前可用的字節(jié)數(shù)沒有請(qǐng)求的字節(jié)數(shù)那么多，則總字節(jié)數(shù)可能小于請(qǐng)求的字節(jié)數(shù)，或者如果已到達(dá)流的末尾，則為零 (0)。

備注：

此方法的實(shí)現(xiàn)從當(dāng)前流中讀取最多的?count?個(gè)字節(jié)，并將它們存儲(chǔ)在從?offset?開始的?buffer?中。流中的當(dāng)前位置提升已讀取的字節(jié)數(shù)；但是，如果出現(xiàn)異常，流中的當(dāng)前位置保持不變。實(shí)現(xiàn)返回已讀取的字節(jié)數(shù)。僅當(dāng)位置當(dāng)前位于流的末尾時(shí)，返回值才為零。如果沒有任何可用的數(shù)據(jù)，該實(shí)現(xiàn)將一直阻塞到至少有一個(gè)字節(jié)的數(shù)據(jù)可讀為止。僅當(dāng)流中不再有其他的數(shù)據(jù)，而且也不再需要更多的數(shù)據(jù)（如已關(guān)閉的套接字或文件尾）時(shí)，Read?才返回 0。即使尚未到達(dá)流的末尾，實(shí)現(xiàn)仍可以隨意返回少于所請(qǐng)求的字節(jié)。

之前一般采用如下方式進(jìn)行數(shù)據(jù)接收：

int recv;//定義接收數(shù)據(jù)長(zhǎng)度變量IPEndPoint ipEnd = new IPEndPoint(IPAddress.Parse(textBox1.Text), int.Parse(textBox2.Text));//接收端所監(jiān)聽的接口,ip也可以用IPAddress.AnySocket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//初始化一個(gè)Socket對(duì)象socket.Bind(ipEnd);//綁定套接字到一個(gè)IP地址和一個(gè)端口上(bind())；socket.Listen(10);while (true){byte[] data = new byte[1024];//對(duì)data清零Socket clientSocket = socket.Accept(); //一旦接受連接，創(chuàng)建一個(gè)客戶端recv = clientSocket.Receive(data);if (recv == 0) //如果收到的數(shù)據(jù)長(zhǎng)度小于0，則退出break;string stringData = "0x" + BitConverter.ToString(data).Replace("-", " 0x").ToLower();this.Invoke((EventHandler)delegate{richTextBox1.Text += DateTime.Now.ToString("yy-MM-dd hh:mm:ss") + stringData + "\n";});}

之前用的時(shí)候沒發(fā)現(xiàn)什么問題，但是今天在測(cè)試金屬門數(shù)據(jù)接收的時(shí)候發(fā)現(xiàn)會(huì)丟數(shù)據(jù)，金屬門每隔十秒給我一次數(shù)據(jù)，用上面這個(gè)差不多60秒才能收到一組數(shù)據(jù)，針對(duì)以上問題，做了如下修改：

將數(shù)據(jù)接收放到 while (true)，數(shù)據(jù)接收正常。

以下分別采用三種方式實(shí)現(xiàn)了數(shù)據(jù)的正常接收，代碼如下：

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Diagnostics; using System.Drawing; 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 MetalGate {public partial class MainForm : Form{public MainForm(){InitializeComponent();}private BackgroundWorker demoBGWorker = new BackgroundWorker();static TcpClient tcpClient;static NetworkStream stream;private void MainForm_Load(object sender, EventArgs e){textBox1.Text = "192.168.1.99";textBox2.Text = "8234";}//private void BGWorker_DoWork(object sender, DoWorkEventArgs e)private void BGWorker_DoWork(){var serverIPEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.99"), 8234); // 當(dāng)前服務(wù)器使用的ip和端口TcpListener tcpListener = new TcpListener(serverIPEndPoint);tcpListener.Start();Console.WriteLine("服務(wù)端已啟用......"); // 阻塞線程的執(zhí)行，直到一個(gè)客戶端連接tcpClient = tcpListener.AcceptTcpClient();Console.WriteLine("已連接.");stream = tcpClient.GetStream(); // 創(chuàng)建用于發(fā)送和接受數(shù)據(jù)的NetworkStreamvar t1 = new Thread(ReceiveMsg);t1.IsBackground = true;t1.Start();}private void BGWorker_DoWork1(){//在這里執(zhí)行耗時(shí)的運(yùn)算。int recv;//定義接收數(shù)據(jù)長(zhǎng)度變量IPEndPoint ipEnd = new IPEndPoint(IPAddress.Parse(textBox1.Text), int.Parse(textBox2.Text));//接收端所監(jiān)聽的接口,ip也可以用IPAddress.AnySocket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//初始化一個(gè)Socket對(duì)象socket.Bind(ipEnd);//綁定套接字到一個(gè)IP地址和一個(gè)端口上(bind())；socket.Listen(10);//創(chuàng)建監(jiān)聽線程Thread thread = new Thread(Listen);thread.IsBackground = true;thread.Start(socket);}/// <summary>/// 等待客戶端的連接 并且創(chuàng)建與之通信的Socket/// </summary>Socket socketSend;void Listen(object o){try{Socket socketWatch = o as Socket;while (true){socketSend = socketWatch.Accept();//等待接收客戶端連接 //開啟一個(gè)新線程，執(zhí)行接收消息方法Thread r_thread = new Thread(Received);r_thread.IsBackground = true;r_thread.Start(socketSend);}}catch { }}/// <summary>/// 服務(wù)器端不停的接收客戶端發(fā)來的消息/// </summary>/// <param name="o"></param>void Received(object o){try{Socket socketSend = o as Socket;while (true){//客戶端連接服務(wù)器成功后，服務(wù)器接收客戶端發(fā)送的消息byte[] buffer = new byte[1024 * 1024 * 3];//實(shí)際接收到的有效字節(jié)數(shù)int len = socketSend.Receive(buffer);if (len == 0){break;}// string str = Encoding.UTF8.GetString(buffer, 0, len);string stringData = "0x" + BitConverter.ToString(buffer, 0, len).Replace("-", " 0x").ToLower();this.Invoke((EventHandler)delegate{richTextBox1.Text += DateTime.Now.ToString("yy-MM-dd hh:mm:ss -*- ") + stringData + "\n";});}}catch { }}private void BGWorker_DoWork2(){int recv;//定義接收數(shù)據(jù)長(zhǎng)度變量IPEndPoint ipEnd = new IPEndPoint(IPAddress.Parse(textBox1.Text), int.Parse(textBox2.Text));//接收端所監(jiān)聽的接口,ip也可以用IPAddress.AnySocket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//初始化一個(gè)Socket對(duì)象socket.Bind(ipEnd);//綁定套接字到一個(gè)IP地址和一個(gè)端口上(bind())；socket.Listen(10);new Thread(delegate (){Socket clientSocket = null;while (true){Stopwatch sw = new Stopwatch();// 開始計(jì)時(shí)sw.Start();clientSocket = socket.Accept(); //一旦接受連接，創(chuàng)建一個(gè)客戶端Task.Run(() =>{while (true){byte[] data = new byte[50];//對(duì)data清零recv = clientSocket.Receive(data, 0, data.Length, SocketFlags.None);//if (recv == 0) //如果收到的數(shù)據(jù)長(zhǎng)度小于0，則退出// break;string stringData = "0x" + BitConverter.ToString(data, 0, recv).Replace("-", " 0x").ToLower();this.Invoke((EventHandler)delegate{richTextBox1.Text += DateTime.Now.ToString("yy-MM-dd hh:mm:ss -*- ") + stringData + "\n";});//結(jié)束計(jì)時(shí) sw.Stop();long times = sw.ElapsedMilliseconds;this.Invoke((EventHandler)delegate{richTextBox1.Text += "執(zhí)行查詢總共使用了" + times + "毫秒" + "\n";});}});}}){ IsBackground = true }.Start();}void ReceiveMsg(){byte[] buffer = new byte[1024]; // 預(yù)設(shè)最大接受1024個(gè)字節(jié)長(zhǎng)度，可修改int count = 0;try{while ((count = stream.Read(buffer, 0, buffer.Length)) != 0){string stringData = "0x" + BitConverter.ToString(buffer, 0, count).Replace("-", " 0x").ToLower();Console.WriteLine($"{tcpClient.Client.LocalEndPoint.ToString()}:{DateTime.Now.ToString("yy-MM-dd hh:mm:ss -*- ") + stringData + "\n"}");this.Invoke((EventHandler)delegate{richTextBox1.Text += DateTime.Now.ToString("yy-MM-dd hh:mm:ss -*- ") + stringData + "\n";});}}catch(Exception ex){Console.WriteLine(ex.Message);}}private void SendData(IPAddress remoteIP, int Port, byte[] bits){//實(shí)例化socket Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);IPEndPoint ipep = new IPEndPoint(remoteIP, Port);socket.Connect(ipep);//socket.Send(bits, 8, SocketFlags.None);socket.Send(bits);socket.Close();}private void btnListen_Click(object sender, EventArgs e){//demoBGWorker.DoWork += BGWorker_DoWork;//demoBGWorker.RunWorkerAsync();//Task.Run(() =>// {BGWorker_DoWork2();//});}private void btnSend_Click(object sender, EventArgs e){byte[] order = new byte[8];order = new byte[] { 0x80, 0x04, 0x00, 0x7F };SendData(IPAddress.Parse("192.168.1.100"), int.Parse("49558"), order);MessageBox.Show("指令發(fā)送成功");}} }

測(cè)試：

?Task.Run(() => {}); 這個(gè)可以去掉；

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