C#网络编程——点对点聊天（用的是TcpClient）给分各位高手们帮帮忙

xxl773593778 2010-07-04 09:21:14

写了点对点聊天为什么老是连接不成功？运行的时候出现这个问题：

由于目标机器积极拒绝，无法连接，或者就是由于连接方在一段时间后没有正确答复或者没有反应。。。这是为什么？？？要怎样才可以实现点对点聊天？
PS:运行程序的时候是不是需要两个用户分别运行客户端程序，然后再用一台电脑来运行服务器程序？
代码如下：namespace P2PChat
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}
private Thread td;
private TcpListener tcpListener;
private static string message = "";

private void frmMain_Load(object sender, EventArgs e)
{
td = new Thread(new ThreadStart(this.StartListen));
td.Start();
timer1.Start();
}

private void button3_Click(object sender, EventArgs e)
{
Application.Exit();
}

private void button2_Click(object sender, EventArgs e)
{
try
{
IPAddress[] ip = Dns.GetHostAddresses(Dns.GetHostName());
string strmsg = " "+txtName.Text + "("+ip[0].ToString()+") "+DateTime.Now.ToLongTimeString()+"\n" +" "+ this.rtbSend.Text + "\n";
TcpClient client = new TcpClient(txtIP.Text, 888);
NetworkStream netstream = client.GetStream();
StreamWriter wstream = new StreamWriter(netstream, Encoding.Default);
wstream.Write(strmsg);
wstream.Flush();
wstream.Close();
client.Close();
rtbContent.AppendText(strmsg);
rtbContent.ScrollToCaret();
rtbSend.Clear();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

private void StartListen()
{
message = "";
tcpListener = new TcpListener(888);
tcpListener.Start();
while (true)
{
TcpClient tclient = tcpListener.AcceptTcpClient(); //接受连接请求
NetworkStream nstream = tclient.GetStream(); //获取数据流
byte[] mbyte = new byte[1024]; //建立缓存
int i = nstream.Read(mbyte, 0, mbyte.Length); //将数据流写入缓存
message = Encoding.Default.GetString(mbyte, 0, i);
}
}

private void frmMain_FormClosed(object sender, FormClosedEventArgs e)
{
if (this.tcpListener != null)
{
tcpListener.Stop();
}
if (td != null)
{
if (td.ThreadState == ThreadState.Running)
{
td.Abort();
}
}
}

private void button1_Click(object sender, EventArgs e)
{
rtbContent.Clear();
}

private void rtbSend_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == '\r')
{
button2_Click(sender,e);
}
}

private void timer1_Tick(object sender, EventArgs e)
{
if (message != "")
{
rtbContent.AppendText(message);
rtbContent.ScrollToCaret();
message = "";
}
}
}
}

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