问题
I have two project "Server" and "Client" that communicate over a LAN,
this my server code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ServerClientProject
{
public partial class FormServer : Form
{
private static Int32 port;
private static string filePath;
TcpListener server = new TcpListener(IPAddress.Any, port);
public FormServer()
{
InitializeComponent();
}
private void FormServer_Load(object sender, EventArgs e)
{
File.WriteAllText("path.misc","");
File.WriteAllText("nama.misc","");
filePath = readPath();
label1.Text = filePath;
label2.Text = readNama();
label3.Text = IPAddressCheck();
label4.Text = UNCPathing.GetUNCPath(readPath());
label5.Text = GetFQDN();
bw.WorkerSupportsCancellation = true;
bw.WorkerReportsProgress = true;
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
if (bw.IsBusy != true)
{
bw.RunWorkerAsync();
}
}
private static string IPAddressCheck()
{
IPHostEntry IPAddr;
IPAddr = Dns.GetHostEntry(GetFQDN());
IPAddress ipString = null;
foreach (IPAddress ip in IPAddr.AddressList)
{
if (IPAddress.TryParse(ip.ToString(), out ipString) && ip.AddressFamily == AddressFamily.InterNetwork)
{
break;
}
}
return ipString.ToString();
}
public static string GetFQDN()
{
string domainName = IPGlobalProperties.GetIPGlobalProperties().DomainName;
string hostName = Dns.GetHostName();
if (!hostName.EndsWith(domainName)) // if hostname does not already include domain name
{
hostName += "." + domainName; // add the domain name part
}
return hostName; // return the fully qualified name
}
private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
lstProgress.Items.Add(e.UserState);
}
private void bw_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
if ((worker.CancellationPending == true))
{
e.Cancel = true;
}
else
{
try
{
// Set the TcpListener on port 1333.
port = 1337;
//IPAddress localAddr = IPAddress.Parse("127.0.0.1");
TcpListener server = new TcpListener(IPAddress.Any, port);
//label2.Text = IPAddressToString(ip);
// Start listening for client requests.
server.Start();
// Buffer for reading data
Byte[] bytes = new Byte[256];
String data = null;
// Enter the listening loop.
while (true)
{
bw.ReportProgress(0, "Waiting for a connection... ");
// Perform a blocking call to accept requests.
// You could also user server.AcceptSocket() here.
TcpClient client = server.AcceptTcpClient();
bw.ReportProgress(0, "Connected!");
data = null;
// Get a stream object for reading and writing
NetworkStream stream = client.GetStream();
int i;
// Loop to receive all the data sent by the client.
while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
{
// Translate data bytes to a ASCII string.
data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
bw.ReportProgress(0, String.Format("Received: {0}", data));
if (data == "file")
{
// Process the data sent by the client.
data = String.Format("Request: {0}", data);
byte[] mssg = System.Text.Encoding.ASCII.GetBytes(label4.Text);
// Send back a response.
stream.Write(mssg, 0, mssg.Length);
bw.ReportProgress(0, String.Format("Sent: {0}", data));
bw.ReportProgress(0, String.Format("File path : {0}", label4.Text));
}
else if (data == "nama")
{
byte[] mssg = System.Text.Encoding.ASCII.GetBytes(readNama());
stream.Write(mssg, 0, mssg.Length);
}
else if (data == "ip")
{
byte[] mssg = System.Text.Encoding.ASCII.GetBytes(GetFQDN());
stream.Write(mssg, 0, mssg.Length);
}
}
// Shutdown and end connection
client.Close();
}
}
catch (SocketException se)
{
bw.ReportProgress(0, String.Format("SocketException: {0}", se));
}
}
}
private void FormServer_FormClosing(object sender, FormClosingEventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.ShowDialog();
savePath(openFileDialog1.FileName.ToString());
saveNama(openFileDialog1.SafeFileName.ToString());
//folderBrowserDialog1.ShowDialog();
//savePath(folderBrowserDialog1.SelectedPath.ToString());
label1.Text = readPath();
label2.Text = readNama();
label4.Text = UNCPathing.GetUNCPath(readPath());
}
private void savePath(string fPath)
{
string sPath = "Path.misc";
File.WriteAllText(sPath, fPath);
}
private string readPath()
{
string readText = File.ReadAllText("Path.misc");
return readText;
}
private void saveNama(string nama)
{
string sNama = "Nama.misc";
File.WriteAllText(sNama, nama);
}
private string readNama()
{
string readText = File.ReadAllText("Nama.misc");
return readText;
}
}
}
and this my client
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Client
{
public partial class FormClient : Form
{
public FormClient()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
label1.Text = IPAddressCheck();
label2.Text = GetFQDN();
label3.Text = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
}
public void msg(string mesg)
{
lstProgress.Items.Add(">> " + mesg);
}
public static string GetFQDN()
{
string domainName = IPGlobalProperties.GetIPGlobalProperties().DomainName;
string hostName = Dns.GetHostName();
if (!hostName.EndsWith(domainName)) // if hostname does not already include domain name
{
hostName += "." + domainName; // add the domain name part
}
return hostName; // return the fully qualified name
}
private static string IPAddressCheck()
{
IPHostEntry IPAddr;
IPAddr = Dns.GetHostEntry(GetFQDN());
IPAddress ipString = null;
foreach (IPAddress ip in IPAddr.AddressList)
{
if (IPAddress.TryParse(ip.ToString(), out ipString) && ip.AddressFamily == AddressFamily.InterNetwork)
{
break;
}
}
return ipString.ToString();
}
private void button1_Click(object sender, EventArgs e)
{
string message = textBox1.Text;
try
{
// Create a TcpClient.
// Note, for this client to work you need to have a TcpServer
// connected to the same address as specified by the server, port
// combination.
Int32 port = 1337;
string IPAddr = textBox2.Text;
TcpClient client = new TcpClient(IPAddr, port); //Unsure of IP to use.
// Translate the passed message into ASCII and store it as a Byte array.
Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
// Get a client stream for reading and writing.
// Stream stream = client.GetStream();
NetworkStream stream = client.GetStream();
// Send the message to the connected TcpServer.
stream.Write(data, 0, data.Length);
//lstProgress.Items.Add(String.Format("Sent: {0}", message));
// Receive the TcpServer.response.
// Buffer to store the response bytes.
data = new Byte[256];
// String to store the response ASCII representation.
String responseData = String.Empty;
// Read the first batch of the TcpServer response bytes.
Int32 bytes = stream.Read(data, 0, data.Length);
responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
if (message == "file")
{
lstProgress.Items.Add(String.Format("{0}", responseData));
fPath.getPath = (String.Format("{0}", responseData));
label4.Text = UNCPathing.GetUNCPath(fPath.getPath);
}
else if(message == "nama")
{
lstProgress.Items.Add(String.Format("{0}", responseData));
fPath.getNama = (String.Format("{0}", responseData));
}
// Close everything.
stream.Close();
client.Close();
}
catch (ArgumentNullException an)
{
lstProgress.Items.Add(String.Format("ArgumentNullException: {0}", an));
}
catch (SocketException se)
{
lstProgress.Items.Add(String.Format("SocketException: {0}", se));
}
}
private void button2_Click(object sender, EventArgs e)
{
//using (NetworkShareAccesser.Access(GetFQDN(), IPAddressCheck(), "arif.hidayatullah28@gmail.com", "971364825135win8"))
//{
// File.Copy("\\\\"+label1.Text+"\\TestFolder\\"+fPath.getNama+"", @"D:\movie\"+ fPath.getNama+"", true);
//}
}
private void button3_Click(object sender, EventArgs e)
{
string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\\ARIF-PC\aaaaaaaaaa\MsAccess.accdb; Jet OLEDB:Database Password=dbase;";
string cmdText = "SELECT kode, deskripsi, stok, Harga FROM [Barang] ORDER BY kode DESC";
OleDbConnection conn = new OleDbConnection(connString);
OleDbCommand cmd = new OleDbCommand(cmdText, conn);
try
{
conn.Open();
cmd.CommandType = CommandType.Text;
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataTable barang = new DataTable();
da.Fill(barang);
dataGridView1.DataSource = barang;
}
finally
{
conn.Close();
}
}
}
}
but as you can see, I have to know the server ip address, is there a way to make the server and client autodiscover??
I've try this, worked with one PC but with a LAN it failed.
This that I've tried
Sorry form my bad English
回答1:
On the client send a UDP broadcast 192.168.1.255 (this assumes you are operating on a class C network 192.168.1/24). The server then listens for the broadcast from any clients and then sends back a directed UDP packet to the client. The client is listening for this and decodes the packet which contains the address of the server.
This link C# How to do Network discovery using UDP Broadcast and some Google Fu will produce many examples of how to implement this.
来源：https://stackoverflow.com/questions/30091537/how-to-make-server-client-autodiscover-over-a-lan