Question

C# socket连接问题

看到一个TCP的例子大概结构如下

socket client;

void buttonconn(object obj,eventargs ea)
{
soeket newsock = new socket(addressfamily.internetwork,sockettype.stream,protocoltype.tcp)
ipendpoint iep = ...省略
newsock.beginconnect(iep,new asynccallback(connected),newsock);
}

void buttonsend(object obj,eventargs ea)
{
byet[] message = encoding.ascII.getbytes(newtest.test);
client.beginsend(message,0,message.length,,socketflags.none,new asynccallback(senddata),client);
}

现在就想问下，一个按钮连接，一个发送，但是用的不是同一个socket是为什么？这个代码是个简单的示例，就是异步发送，一个socket不行吗。用两个是什么原因，一个连接一个发送，是如何关联的？

Answer 1

这是我以前在学校的时候做的一个c/s系统里面的类似qq聊天工具
你看看。。
这是客服端的代码：
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.Threading;
using System.Net;
using System.Net.Sockets;

namespace demo2
{
public partial class frmTouchWe : Form
{
Thread a;
//发送IP跟端口
private UdpClient udp = new UdpClient("127.0.0.1",9000);
//接收端口
private UdpClient udpSend = new UdpClient(8000);
private IPEndPoint ip = new IPEndPoint(IPAddress.Any,0);
public frmTouchWe()
{
InitializeComponent();
Form.CheckForIllegalCrossThreadCalls = false;
}

private void frmTouchWe_Load(object sender, EventArgs e)
{ //定义线程开始
a = new Thread(new ThreadStart(Run));
a.Start(); }

private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
//客服接收信息。弹出窗体
frmAnswerInfo answerInfo = new frmAnswerInfo();
answerInfo.Show(); }

private void button1_Click(object sender, EventArgs e)
{
//在自己的信息栏中显示自己的信息
lsbInfo.Items.Add(txtInfo.Text);
//用户信息内容
string Mes = txtInfo.Text;
//用户信息
string mes = "用户："+Program.user.id+"("+Program.user.name+")"+" " + time;
//转换成字节
byte[] b = UTF8Encoding.UTF8.GetBytes(Mes);
byte[] bb = UTF32Encoding.UTF8.GetBytes(mes);
//发送信息
udp.Send(bb, bb.Length);
udp.Send(b, b.Length);
txtInfo.Text = "";
}
//循环接受客服发来的信息
private void Run()
{
while (true)
{
byte[] b = udpSend.Receive(ref ip);
string mes = UTF8Encoding.UTF8.GetString(b);
lsbInfo.Items.Add(mes);
}
}

private void button2_Click(object sender, EventArgs e)
{
this.Close();
}

private void button3_Click_1(object sender, EventArgs e)
{
//清空所有项
lsbInfo.Items.Clear();
}
}
}

下面是服务器端的代码
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.Threading;
using System.Net;
using System.Net.Sockets;

namespace demo2
{
public partial class frmAnswerInfo : Form
{
//定义一条线程，用来循环接收客户发来的信息
Thread a;
//定义另一条线程，用来升起窗体
Thread b;
//发送到信息的地址
private UdpClient udpSend = new UdpClient("127.0.0.1",8000);
//接收端口
private UdpClient udp = new UdpClient(9000);
private IPEndPoint ip = new IPEndPoint(IPAddress.Any,0);
public frmAnswerInfo()
{
InitializeComponent();
Form.CheckForIllegalCrossThreadCalls = false;
}
//循环接收信息
private void Run()
{
while (true)
{
byte[] b = udp.Receive(ref ip);
string mes = UTF8Encoding.UTF8.GetString(b);
lsbInfo.Items.Add(mes);
}
}

private void frmAnswerInfo_Load(object sender, EventArgs e)
{
//设置窗体的位置属性(窗体加载时候慢慢从右下角升上来~类似qq广告~~)
this.Top = Screen.PrimaryScreen.WorkingArea.Height;
this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width;
//设置窗体的名字
a = new Thread(new ThreadStart(Run));

b = new Thread(new ThreadStart(run));
//开始线程
a.Start();
b.Start();
}
//用户点击谈话时显示该窗体
private void run()
{
while (true)
{
this.Top = this.Top - 10;
Thread.Sleep(100);
if (Screen.PrimaryScreen.WorkingArea.Height - this.Height >= this.Top)
{
break;
}
}
}
//发送按钮编码
private void button1_Click(object sender, EventArgs e)
{
//获取当前时间
DateTime time = DateTime.Now;
//在自己的信息栏中显示自己发出去的信息
lsbInfo.Items.Add("在线客服："+time);
lsbInfo.Items.Add(txtInfo.Text);

//在客户端显示自己的信息标题
string mes = "在线客服："+time;
//信息内容
string Mes = txtInfo.Text;
//发送信息标题
byte[] b = UTF8Encoding.UTF8.GetBytes(mes);
//发送信息内容
byte[] bb = UTF8Encoding.UTF8.GetBytes(Mes);
udpSend.Send(b, b.Length);
udpSend.Send(bb,bb.Length);
txtInfo.Text = "";
}

private void button2_Click(object sender, EventArgs e)
{
this.Close();
}

private void button3_Click(object sender, EventArgs e)
{
//清除所有项
lsbInfo.Items.Clear();
}
}
}

这个可以跑的。。我以前就用过的。

Answer 2

1.简单服务器端
/*
using System.Data;
using System.Net.Sockets;
using System.Net;
using System.Threading;
*/
private static int port = %%2;
private static Thread thThreadRead;
private static TcpListener TcpListen;
private static bool bListener = true;
private static Socket stRead;
private static void Listen()
{
try
{
TcpListen = new TcpListener(port);
TcpListen.Start();
stRead = TcpListen.AcceptSocket();
EndPoint tempRemoteEP = stRead.RemoteEndPoint;
IPEndPoint tempRemoteIP = (IPEndPoint)tempRemoteEP;
IPHostEntry host = Dns.GetHostByAddress(tempRemoteIP.Address);
string sHostName = host.HostName;
while (bListener)
{
stRead.Send(Encoding.ASCII.GetBytes("Hello"));
string sTime = DateTime.Now.ToShortTimeString();
Byte[] byRead = new Byte[1024];
int iRead = stRead.ReceiveFrom(byRead, ref tempRemoteEP);
Byte[] byText = new Byte[iRead];
Array.Copy(byRead, 0, byText, 0, iRead);
string line = System.Text.Encoding.Default.GetString(byRead);
}
}
catch (System.Security.SecurityException)
{
//监听失败
}
}
thThreadRead = new Thread(new ThreadStart(Listen));
thThreadRead.Start();

2.简单客户端
/*
using System.Data;
using System.Net.Sockets;
using System.Net;
*/
private static IPEndPoint dateTimeHost;
string hostIPString=%%1;
string hostPortString=%%2;
IPAddress hostIP=IPAddress.Parse(hostIPString);
dateTimeHost=new IPEndPoint(hostIP,Int32.Parse(hostPortString));
Socket conn=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
conn.Connect(dateTimeHost);
int bytes=0;
Byte[] RecvBytes=new Byte[256];
bytes=conn.Receive(RecvBytes,RecvBytes.Length,0);
string RecvString=Encoding.ASCII.GetString(RecvBytes,0,bytes);
Console.WriteLine(RecvString);
conn.Shutdown(SocketShutdown.Both);
conn.Close();

3.获得本机IP
//using System.Net;
IPAddress[] addressList = Dns.GetHostByName(Dns.GetHostName()).AddressList;
string %%1=null;
for (int i = 0; i < addressList.Length; i++)
{
%%1 += addressList[i].ToString();
}

4.端对端通信
/*
using System.Net;
using System.Net.Sockets;
*/
UdpClient client=new UdpClient(%%2);
IPAddress a=IPAddress.Parse("127001");
IPEndPoint receivePoint=new IPEndPoint(a,%%2);
IPAddress HostIP=null;
byte[] sendData=Encoding.UTF8.GetBytes(%%3);
byte[] recData;
try{
HostIP=IPAddress.Parse(%%1);
}
catch {
recData=client.Receive(ref receivePoint);
%%3=Encoding.UTF8.GetString(recData);
client.Send(sendData,sendData.Length,%%4,%%2);
client.Close();
}
IPEndPoint host=new IPEndPoint(HostIP,%%2);
recData=client.Receive(ref receivePoint);
%%3=Encoding.UTF8.GetString(recData);
client.Close();

5.点对点通信
/*
using System.Data;
using System.Net.Sockets;
using System.Net;
using System.Threading;
*/
Thread th;
TcpListener tpListen1;
bool listenerRun=true;
NetworkStream tcpStream;
StreamWriter reqStreamW;
TcpClient tcpc;
Socket skSocket;
protected void Listen()
{
try{
tpListen1=new TcpListener(Int32.Parse(%%2));
tpListen1.Start();
skSocket=tpListen1.AcceptSocket();
EndPoint tempRemoteEP=skSocket.RemoteEndPoint;
IPEndPoint tempRemoteIP=(IPEndPoint)tempRemoteEP;
IPHostEntry host=Dns.GetHostByAddress(tempRemoteIP.Address);
string HostName=host.HostName;
while(listenerRun)
{
Byte[] stream=new Byte[1024];
string time=DateTime.Now.ToString();
int i=skSocket.ReceiveFrom(stream,ref tempRemoteEP);
string %%5=Encoding.UTF8.GetString(stream);
//指定编码，从缓冲区中解析出内容
//time+" "+HostName+":"
}
}
catch(Security.SecurityException)
{
//防火墙安全错误！
}
try{
string sMsg=%%4;
string MyName=Dns.GetHostName();
reqStreamW=new StreamWriter(tcpStream);
reqStreamW.Write(sMsg);
reqStreamW.Flush();
string time=DateTime.Now.ToString();
//显示传送的数据和时间
//time+" "+MyName+":"
//sMsg
}
catch(Exception)
{
//无法发送信息到目标计算机！
}

protected override void Dispose(bool disposing)
{
try{
listenerRun=false;
th.Abort();
th=null;
tpListen1.Stop();
skSocket.Close();
tcpc.Close();
}
catch{}
if(disposing && component!=null)
{
components.Dispose();
}
}
base.Dispose(disposing);
}

Answer 3

1,
建议了解一下TCP/IP还有UDP通信方式，不是很复杂的，百度一下你就知道了.
2,
socket分为服务器端和客户端，
服务器端是用于专门接受客户端发来的信息。 <收>
客户端是专门用于像服务段发送信息的。 <发>
服务端和客户端的端口号是不一样的。所以可以两个同时存在，一个来发一个来收的.
3,
注意编程风格和可读行。

Answer 4

socket分为服务器端个客户端，服务器端是专门用来接受客户端发来的信息。
你在建立服务器端的时候你要分配一个端口号，然后客户端发送信息的时候就发给那个端口号，这样子就可以接发信息了。