websocket成功握手，但未正确发送接收消息(C#服务器)
本文关键字：消息 服务器 成功 websocket | 更新日期: 2023-09-27 18:21:59
经过一上午的战斗，我终于可以握手了，但现在我在收发消息时遇到了麻烦。我一直在寻找答案，但没有结果，所以我想我终于可以走到这里问：/
到目前为止，我的客户很简单：
function testWebSocket() {
if (!window.WebSocket) {
alert('WebSockets are NOT supported by your browser.');
return;
}
try {
var ws = new WebSocket('ws://localhost:8181/websession');
ws.onopen = function () {
alert('Handshake successfully established. Ready for data...');
};
ws.onmessage = function (e) {
alert('Got WebSockets message: ' + e.data);
}
ws.onclose = function () {
alert('Connection closed.');
};
}
catch (e) {
alert(e);
}
}
是的，我为此借用了很多代码。。。我只是想用一个简单的"聊天应用程序"来验证概念
我的服务器主要由两个类组成，SocketServer.cs和SocketClient.cs
它们遵循：
SocketServer.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.IO;
namespace WebSocketServer.Entities
{
class SocketServer
{
public static Form1 parentForm;
TcpListener socketServer;
public static List<SocketClient> ClientList = new List<SocketClient>();
public SocketServer(Form1 pForm)
{
parentForm = pForm;
parentForm.ApplyText("Socket Class Initiated'r'n");
socketServer = new TcpListener(IPAddress.Any, 8181);
// tell the console that it's started
parentForm.ApplyText("Socket Server Started'r'n");
// create continuous loops to listen for new connections
// start the listener
socketServer.Start();
while (true)
{
// check for any incoming pending connections
// create new socket client for new connection
TcpClient socketConnection = socketServer.AcceptTcpClient();
DateTime now = DateTime.Now;
//write message to console to indicate new connection
parentForm.ApplyText("New Client Connected - " + now.ToString("MM/dd/yyyy h:mm:ss tt") + "'r'n");
// create new client object for this connection
SocketClient socketClient = new SocketClient(socketConnection, parentForm);
}
}
public static void CloseClient(SocketClient whichClient)
{
ClientList.Remove(whichClient);
whichClient.Client.Close();
// dispose of the client object
whichClient.Dispose();
whichClient = null;
parentForm.ApplyText("Client Disconnected'r'n");
}
public static void SendTextToClient(SocketClient sc, string text)
{
StreamWriter writer = new StreamWriter(sc.Client.GetStream());
// check if client is still connected, then send the text string
try
{
if (sc.Client.Connected)
{
writer.WriteLine(text);
writer.Flush();
writer = null;
}
}
catch
{
CloseClient(sc);
}
}
public static void SendBroadcast(string text)
{
StreamWriter writer;
// loop through the array and send text to all clients
foreach (SocketClient client in ClientList)
{
if (client.Client.Connected)
{
try
{
writer = new StreamWriter(client.Client.GetStream());
writer.WriteLine(text);
writer.Flush();
writer = null;
}
catch
{
CloseClient(client);
}
}
}
}
}
}
SocketClient.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Security.Cryptography;
namespace WebSocketServer.Entities
{
class SocketClient
{
public TcpClient Client;
StreamReader reader;
StreamWriter writer;
Form1 parentForm;
public SocketClient(TcpClient client, Form1 pForm)
{
parentForm = pForm;
Client = client;
Thread clientThread = new Thread(new ThreadStart(StartClient));
clientThread.Start();
}
private void StartClient()
{
SocketServer.ClientList.Add(this);
// create a reader for this client
reader = new StreamReader(Client.GetStream());
// create a writer for this client
writer = new StreamWriter(Client.GetStream());
var headers = new Dictionary<string, string>();
string line = "";
while ((line = reader.ReadLine()) != string.Empty)
{
if (!string.IsNullOrEmpty(line))
{
var tokens = line.Split(new char[] { ':' }, 2);
if (!string.IsNullOrWhiteSpace(line) && tokens.Length > 1)
{
headers[tokens[0]] = tokens[1].Trim();
}
}
}
String secWebSocketAccept = ComputeWebSocketHandshakeSecurityHash09(headers["Sec-WebSocket-Key"]);
// send handshake to this client only
writer.WriteLine("HTTP/1.1 101 Web Socket Protocol Handshake");
writer.WriteLine("Upgrade: WebSocket");
writer.WriteLine("Connection: Upgrade");
writer.WriteLine("WebSocket-Origin: http://localhost:63422/");
writer.WriteLine("WebSocket-Location: ws://localhost:8181/websession");
writer.WriteLine("Sec-WebSocket-Accept: " + secWebSocketAccept);
writer.WriteLine("");
writer.Flush();
SocketServer.SendBroadcast("New Client Connected");
Thread clientRun = new Thread(new ThreadStart(RunClient));
clientRun.Start();
}
public static String ComputeWebSocketHandshakeSecurityHash09(String secWebSocketKey)
{
const String MagicKEY = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
String secWebSocketAccept = String.Empty;
// 1. Combine the request Sec-WebSocket-Key with magic key.
String ret = secWebSocketKey + MagicKEY;
// 2. Compute the SHA1 hash
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] sha1Hash = sha.ComputeHash(Encoding.UTF8.GetBytes(ret));
// 3. Base64 encode the hash
secWebSocketAccept = Convert.ToBase64String(sha1Hash);
return secWebSocketAccept;
}
private void RunClient()
{
try
{
string line = "";
while (true)
{
line = reader.ReadLine();
if (!string.IsNullOrEmpty(line))
{
parentForm.ApplyText(line + "'r'n");
SocketServer.SendBroadcast(line);
}
}
}
catch
{
parentForm.ApplyText("Client Disconnected'r'n");
SocketServer.CloseClient(this);
}
}
public void Dispose()
{
System.GC.SuppressFinalize(this);
}
}
}
我可以在Chrome中连接多个实例，我的服务器显示所有连接的客户端，我看到握手成功的警报。但是，当我尝试从客户端发送文本时（上面没有显示代码，但这是一个非常简单的ws.send（文本）类型的东西），它在服务器上会显示为乱码文本。当我尝试做一个作家。从服务器到客户端的WriteLine（"whatever"），onmessage事件永远不会触发。在我终于解决了握手问题后，我做了很多环顾四周的工作，但找不到任何解决这个问题的好例子。
我不应该使用StreamWriter吗？我是不是在握手时遗漏了其他东西（可能是协议）。
TIA寻求帮助。
编辑：
下面的代码可以工作，但我不知道如何修改它以允许动态大小的文本长度。在这一点上，我可以发送127或更少的文本，但我似乎无法掌握如何超过4。
public static void SendBroadcast(string text)
{
StreamWriter writer;
// loop through the array and send text to all clients
foreach (SocketClient client in ClientList)
{
if (client.Client.Connected)
{
try
{
NetworkStream l_Stream = client.Client.GetStream();
List<byte> lb = new List<byte>();
lb.Add(0x81);
lb.Add(0x04);
lb.AddRange(Encoding.UTF8.GetBytes("test"));
l_Stream.Write(lb.ToArray(), 0, 6);
}
catch
{
CloseClient(client);
}
}
}
}
我尝试过将lb.Add（0x04）修改为lb.Add，并发送"测试"无骰子。我还弄不清楚l_Stream.Write（）参数是什么。我知道它是字节数组，偏移量和大小，但大小是什么？
在最新版本的规范中，消息不是以纯文本形式发送的。有关详细信息，请参阅数据帧部分。
这篇维基文章也很有帮助。
我还编写了一个C++服务器；CCD_ 1类示出了如何读取/写入数据。
EDIT：在示例发送代码中，0x04字节指定4字节的消息。您可以设置不同的值，并通过这种方式发送最多125字节的消息。更改消息长度时，还必须将最后一个参数更新为l_Stream.Write（指定要写入的字节数）。将其更改为磅。在所有情况下计数似乎更好。
如果你仍然觉得按位操作令人困惑，并且以后想发送更长的消息或从客户端读取消息，那么上面的wiki帖子链接包括伪代码，这应该会很有帮助。
我遇到了同样的问题，我找到了解决方案：
lb = new List<byte>();
lb.Add(0x81);
size = message.Length;//get the message's size
lb.Add((byte)size); //get the size in bytes
lb.AddRange(Encoding.UTF8.GetBytes(message));
stream.Write(lb.ToArray(), 0, size+2); //I do size+2 because we have 2 bytes plus 0x81 and (byte)size
使用此解决方案，您可以发送更大的消息，但只能<127个字符
注意：对不起，我的英语不太好