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我是 C# 新手,正在练习套接字编程。
首先,我为客户端连接创建了一个服务器。
服务器:
class Program {
static void Main(string[] args) {
int recv;
byte[] data = new byte[1024];
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 1900);
Socket newsock = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp);
newsock.Bind(ipep);
Console.WriteLine("Waiting for a client...");
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint Remote = (EndPoint)(sender);
recv = newsock.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}:", Remote.ToString());
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
string welcome = "Welcome to my test server";
data = Encoding.ASCII.GetBytes(welcome);
newsock.SendTo(data, data.Length, SocketFlags.None, Remote);
while (true) {
data = new byte[1024];
recv = newsock.ReceiveFrom(data, ref Remote);
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
newsock.SendTo(data, recv, SocketFlags.None, Remote);
}
}
}
客户:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
namespace serverUDPWF {
public partial class ServerForm : Form {
byte[] data = new byte[30];
string input = "";
string stringData = "";
IPEndPoint iep,sender;
Socket server;
string welcome = "";
int recv;
EndPoint tmpRemote;
public ServerForm() {
InitializeComponent();
startServer();
}
public void startServer() {
iep = new IPEndPoint(
IPAddress.Parse("127.0.0.1"), 1900);
server = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp);
welcome = "Hello, are you there?";
data = Encoding.ASCII.GetBytes(welcome);
server.SendTo(data, data.Length, SocketFlags.None, iep);
sender = new IPEndPoint(IPAddress.Any, 0);
tmpRemote = (EndPoint)sender;
data = new byte[30];
recv = server.ReceiveFrom(data, ref tmpRemote);
Console.WriteLine();
listBox1.Items.Add("Message received from {0}:" + tmpRemote.ToString());
listBox1.Items.Add(Encoding.ASCII.GetString(data, 0, recv));
}
private void sendMessageToserver(object sender, EventArgs e) {
if (textBox2.Text == "") {
MessageBox.Show("Please Enter Your Name");
}
else {
int i = 30;
input = textBox2.Text + ": " + textBox1.Text;
if (input == "exit") {
this.Close();
}
server.SendTo(Encoding.ASCII.GetBytes(input), tmpRemote);
textBox1.Text = "";
data = new byte[i];
try {
recv = server.ReceiveFrom(data, ref tmpRemote);
stringData = Encoding.ASCII.GetString(data, 0, recv);
listBox1.Items.Add(stringData);
}
catch (SocketException) {
listBox1.Items.Add("WARNING: data lost, retry message.");
i += 10;
}
}
}
}
}
我的问题是如何使客户端不需要输入服务器 ip 地址,如 127.0.0.1。我的第二个问题是我同时打开 2 个客户端,但是客户端 A 向服务器发送消息,但客户端 B 没有收到来自客户端 A 的消息(我想发送广播类型的消息)
我该怎么做?
最佳答案
多播udp通信..我只是尝试如果有任何问题随时分享
客户:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.Threading;
namespace Myclient
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
CheckForIllegalCrossThreadCalls = false;
}
Socketsending socketsending;
string multicastIP = string.Empty;
int multicastPort = 0;
int clientPort = 0;
string clientSysname = string.Empty;
string Nodeid = string.Empty;
string clientIP = string.Empty;
string recievedText = string.Empty;
string sendingText = string.Empty;
IPAddress ipAddress;
IPEndPoint ipEndpoint;
UdpClient udpClient;
string[] splitRecievedText;
byte[] byteRecieve;
private void Form1_Load(object sender, EventArgs e)
{
Random _random = new Random();
multicastIP = "224.5.6.7";
multicastPort = 5000;
Nodeid = "node" + _random.Next(1000, 9999);
clientPort = _random.Next(1000, 9999);
clientSysname = Dns.GetHostName();
ipAddress = Dns.GetHostEntry(clientSysname).AddressList.FirstOrDefault
(addr => addr.AddressFamily.Equals(AddressFamily.InterNetwork));
ipEndpoint = new IPEndPoint(ipAddress, clientPort);
clientIP = ipAddress.ToString();
label1.Text = "Node id: " + Nodeid;
label2.Text = "Host Name: " + clientSysname;
Thread threadMain = new Thread(connect);
threadMain.Start();
threadMain = new Thread(receive);
threadMain.Start();
}
void connect()
{
socketsending = new Socketsending();
sendingText = "connect@" + clientSysname + "#" + clientIP + "#" + clientPort + "#" + Nodeid + "#";
socketsending.send(multicastIP, multicastPort, sendingText);
}
void receive()
{
udpClient = new UdpClient(clientPort);
while (true)
{
IPEndPoint _ipendpoint = null;
byteRecieve = udpClient.Receive(ref _ipendpoint);
recievedText = Encoding.ASCII.GetString(byteRecieve);
splitRecievedText = recievedText.Split('@');
if (splitRecievedText[0] == "stop")
{
}
}
}
private void button1_Click(object sender, EventArgs e)
{
sendingText = "message@" + Nodeid + '$' + textBox1.Text + '$';
socketsending.send(multicastIP, multicastPort, sendingText);
}
}
}
服务器:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
using System.Collections;
namespace Myserver
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
CheckForIllegalCrossThreadCalls = false;
}
string multicastip = string.Empty;
string serversystemname = string.Empty;
string receiveddata = string.Empty;
string nodeinfo = string.Empty;
string clientHostName = string.Empty;
string clientIP = string.Empty;
string Nodeid = string.Empty;
int multicastport = 0;
int clientport = 0;
DataTable datatable;
DataTable dataTableAddRemove;
string[] splitReceived;
string[] splitnodeinfo;
Socket socket;
IPAddress ipaddress;
IPEndPoint ipendpoint;
byte[] bytereceive;
Dictionary<string, string> dictionarytable;
public delegate void updategrid();
private void Form1_Load(object sender, EventArgs e)
{
multicastip = "224.5.6.7";
multicastport = 5000;
serversystemname = Dns.GetHostName();
datatable = new DataTable();
datatable.Columns.Add("HostName");
datatable.Columns.Add("Nodeid");
datatable.Columns.Add("ipaddress");
datatable.Columns.Add("portnumber");
DGV.DataSource = datatable;
Thread threadreceive = new Thread(receiver);
threadreceive.Start();
}
void receiver()
{
dictionarytable = new Dictionary<string, string>();
socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
ipendpoint = new IPEndPoint(IPAddress.Any, multicastport);
socket.Bind(ipendpoint);
ipaddress = IPAddress.Parse(multicastip);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(ipaddress, IPAddress.Any));
while (true)
{
bytereceive = new byte[4200];
socket.Receive(bytereceive);
receiveddata = Encoding.ASCII.GetString(bytereceive, 0, bytereceive.Length);
splitReceived = receiveddata.Split('@');
if (splitReceived[0].ToString() == "connect")
{
nodeinfo = splitReceived[1].ToString();
connect();
}
else if (splitReceived[0].ToString() == "Disconnect")
{
nodeinfo = splitReceived[1].ToString();
Thread threadDisconnect = new Thread(disconnect);
threadDisconnect.Start();
}
else if (splitReceived[0].ToString() == "message")
{
string[] str = splitReceived[1].Split('$');
listBox1.Items.Add(str[0] + " -> " + str[1]);
}
}
}
void connect()
{
SocketSending socketsending = new SocketSending();
int count = 0;
splitnodeinfo = nodeinfo.Split('#');
clientHostName = splitnodeinfo[0].ToString();
clientIP = splitnodeinfo[1].ToString();
clientport = Convert.ToInt32(splitnodeinfo[2].ToString());
Nodeid = splitnodeinfo[3].ToString();
if (!dictionarytable.ContainsKey(Nodeid))
{
count++;
dictionarytable.Add(Nodeid, clientIP + "#" + clientport + "#" + clientHostName);
dataTableAddRemove = (DataTable)DGV.DataSource;
DataRow dr = dataTableAddRemove.NewRow();
dr["Nodeid"] = Nodeid;
dr["HostName"] = clientHostName;
dr["IPAddress"] = clientIP;
dr["portNumber"] = clientport;
dataTableAddRemove.Rows.Add(dr);
datatable = dataTableAddRemove;
updatenodegrid();
}
}
void disconnect()
{
SocketSending socketsending = new SocketSending();
string removeClient = string.Empty;
splitnodeinfo = nodeinfo.Split('#');
clientHostName = splitnodeinfo[0].ToString();
Nodeid = splitnodeinfo[1].ToString();
dataTableAddRemove = (DataTable)DGV.DataSource;
DataRow[] arrayDataRow = dataTableAddRemove.Select();
for (int i = 0; i < arrayDataRow.Length; i++)
{
string matchGridHostName = arrayDataRow[i]["HostName"].ToString();
if (clientHostName == matchGridHostName)
{
Thread.Sleep(100);
removeClient = clientHostName;
arrayDataRow[i].Delete();
break;
}
}
if (dictionarytable.ContainsKey(removeClient))
{
dictionarytable.Remove(removeClient);
}
}
void updatenodegrid()
{
if (this.DGV.InvokeRequired)
this.DGV.Invoke(new updategrid(updatenodegrid));
else
DGV.DataSource = datatable;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
dictionarytable.Clear();
}
}
}
关于c# - 在客户端之间发送消息(Socket UDP),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9281648/
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