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C#完整的通信代码（点对点，点对多，同步，异步，UDP，TCP).docx
C# code
namespace UDPServer
{
class Program
{
static void Main(string[] args)
{
int recv;
byte[] data = new byte[1024];
//构建TCP 服务器
//得到本机IP，设置TCP端口号
IPEndPoint ipep = new IPEndPoint(IPAddress.Any , 8001);
Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram ,
ProtocolType.Udp);
//绑定网络地址
newsock.Bind(ipep);
Console.WriteLine("This is a Server, host name is {0}",Dns.GetHostName());
//等待客户机连接
Console.WriteLine("Waiting for a client...");
//得到客户机IP
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 ));
//客户机连接成功后，发送欢迎信息
string welcome = "Welcome ! ";
//字符串与字节数组相互转换
data = Encoding .ASCII .GetBytes (welcome );
//发送信息
newsock .SendTo (data ,data.Length ,SocketFlags .None ,Remote );
while (true )
{
data =new byte [1024];
//发送接受信息
recv =newsock.ReceiveFrom(data ,ref Remote);
Console .WriteLine (Encoding .ASCII .GetString (data ,0,recv));
newsock .SendTo (data ,recv ,SocketFlags .None ,Remote );
}
}
}
}
C# code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
namespace UDPClient
{
class Program
{
static void Main(string[] args)
{
byte[] data = new byte[1024];
string input ,stringData;
//构建TCP 服务器
Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName());
//设置服务IP，设置TCP端口号
IPEndPoint ipep = new IPEndPoint(IPAddress .Parse ("127.0.0.1") , 8001);
//定义网络类型，数据连接类型和网络协议UDP
Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,
ProtocolType.Udp);
string welcome = "Hello! ";
data = Encoding.ASCII.GetBytes(welcome);
server.SendTo(data, data.Length, SocketFlags.None, ipep);
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint Remote = (EndPoint)sender;
data = new byte[1024];
int recv = server.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}: ", Remote.ToString());
Console.WriteLine(Encoding .ASCII .GetString (data,0,recv));
while (true)
{
input = Console .ReadLine ();
if (input =="exit")
break ;
server .SendTo (Encoding .ASCII .GetBytes (input ),Remote );
data = new byte [1024];
recv = server.ReceiveFrom(data, ref Remote);
stringData = Encoding.ASCII.GetString(data, 0, recv);
Console.WriteLine(stringData);
}
Console .WriteLine ("Stopping Client.");
server .Close ();
}
}
}
C# code
TCPClient
TCPClient 类提供了一种使用 TCP 协议连接到某个端点的简化方法。它还通过 NetworkStream
对象展现在连接过程中读取或写入的数据。请参见下面从 QuickStart 文档中摘录的日期/时间客户
机示例。
使用 C# 编写
using System;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Text;
class Client
{
public static void Main(String[] args)
{
TCPClient tcpc = new TCPClient();
Byte[] read = new Byte[32];
if (args.Length != 1)
{
Console.WriteLine(“请在命令行中指定服务器名称”);
return;
}
String server = args[0];
// 验证服务器是否存在
if (DNS.GetHostByName(server) == null)
{
Console.WriteLine(“找不到服务器：” + 服务器);
return;
}
// 尝试连接到服务器
if (tcpc.Connect(server, 13) == -1)
{
Console.WriteLine(“无法连接到服务器：” + 服务器);
return;
}
// 获取流
Stream s = tcpc.GetStream();
// 读取流并将它转换为 ASCII 码形式
int bytes = s.Read(read, 0, read.Length);
String Time = Encoding.ASCII.GetString(read);
// 显示数据
Console.WriteLine(“已接收到的” + 字节 + “字节”);
Console.WriteLine(“当前日期和时间是：” + 时间);
tcpc.Close();
}
}
TCPListener
TCPListener 类便于在来自某个客户机的 TCP 连接的特定套接字上进行侦听的工作。请参见下面
包括在 QuickStart 文档中的日期/时间服务器示例。
使用 C# 编写
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class Server
{
public static void Main()
{
DateTime now;
String strDateLine;
Encoding ASCII = Encoding.ASCII;
// 在端口 13 进行侦听
TCPListener tcpl = new TCPListener(13);
tcpl.Start();
Console.WriteLine(“正在等待客户进行连接”);
Console.WriteLine(“请按 Ctrl+c 退出...”);
while (true)
{
// 接收会阻塞，直到有人连接上
Socket s = tcpl.Accept();
// 获取当前的日期和时间并将它连接成一个字符串
now = DateTime.Now;
strDateLine = now.ToShortDateString() + " " +
now.ToLongTimeString();
// 将该字符串转换成一个字节数组并发送它
Byte[] byteDateLine =
ASCII.GetBytes(strDateLine.ToCharArray());
s.Send(byteDateLine, byteDateLine.Length, 0);
Console.WriteLine(“发送” + strDateLine);
}
}
}
#region "Download: File transfer FROM ftp server"
///
/// Copy a file from FTP server to local
///
/// Target filename, if required
/// Full path of the local file
///
/// Target can be blank (use same filename), or just a filename
/// (assumes current directory) or a full path and filename
public bool Download(string sourceFilename, string localFilename, bool
PermitOverwrite)
{
//2. determine target file
FileInfo fi = new FileInfo(localFilename);
return this.Download(sourceFilename, fi, PermitOverwrite);
}
//Version taking an FtpFileInfo
public bool Download(FtpFileInfo file, string localFilename, bool permitOverwrite)
{
return this.Download(file.FullName, localFilename, permitOverwrite);
}
//Another version taking FtpFileInfo and FileInfo
public bool Download(FtpFileInfo file, FileInfo localFI, bool permitOverwrite)
{
return this.Download(file.FullName, localFI, permitOverwrite);
}
//Version taking string/FileInfo
public bool Download(string sourceFilename, FileInfo targetFI, bool permitOverwrite)
{
//1. check target
if (targetFI.Exists && !(permitOverwrite))
{
throw (new ApplicationException("Target file already exists"));
}
//2. check source
string target;
if (sourceFilename.Trim() == "")
{
throw (new ApplicationException("File not specified"));
}
else if (sourceFilename.Contains("/"))
{
//treat as a full path
target = AdjustDir(sourceFilename);
}
else
{
//treat as filename only, use current directory
target = CurrentDirectory + sourceFilename;
}
string URI = Hostname + target;
//3. perform copy
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to download a file in binary mode
ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
ftp.UseBinary = true;
//open request and get response stream
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
using (Stream responseStream = response.GetResponseStream())
{
//loop to read & write to file
using (FileStream fs = targetFI.OpenWrite())
{
try
{
byte[] buffer = new byte[2048];
int read = 0;
do
{
read = responseStream.Read(buffer, 0, buffer.Length);
fs.Write(buffer, 0, read);
} while (!(read == 0));
responseStream.Close();
fs.Flush();
fs.Close();
}
catch (Exception)
{
//catch error and delete file only partially downloaded
fs.Close();
//delete target file as it's incomplete
targetFI.Delete();
throw;
}
}
responseStream.Close();
}
response.Close();
}
return true;
}
#endregion
简单的UDP收发.
发送
C# code
try
{
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,
ProtocolType.Udp); //向此网段发广播包
int UDPListenerPort = 8082;
IPAddress broadcast = IPAddress.Parse("192.168.0.255"); //此处根据IP及子网掩码改为相
应的广播IP
string ts = "This is UPD string for sending";
byte[] sendbuf = Encoding.ASCII.GetBytes(ts);
IPEndPoint ep = new IPEndPoint(broadcast, UDPListenerPort);
s.SendTo(sendbuf, ep);
}
catch (Exception e)
{}
接收
C# code
UdpClient listener;
int UDPListenerPort = 8082;
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, UDPListenerPort);
try
{
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