【原】C# 三種方式實(shí)現(xiàn)Socket數(shù)據(jù)接收(經(jīng)典)

ontheroad96j47 2021-11-08

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Stream.Read 方法

當(dāng)在派生類中重寫(xiě)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(kāi)始的字節(jié)偏移量，從此處開(kāi)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(méi)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(kāi)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(méi)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(tīng)的接口,ip也可以用IPAddress.Any

            Socket 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(méi)發(fā)現(xiàn)什么問(wèn)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(wèn)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NetworkStream

var 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(tīng)的接口,ip也可以用IPAddress.Any

            Socket 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(tīng)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(kāi)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(lái)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(tīng)的接口,ip也可以用IPAddress.Any

            Socket 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(kāi)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"); } }}