t;." + ArrIP[1] + "." + ArrIP[2] + "." + ArrIP[3];

Initialize(ServerIP);

AddToMain("Starting Listener thread...");

//开始新线程
t = new Thread(new ThreadStart(Listener)); //侦听线程
t.Start();

this.btnStart.Enabled = false;
this.btnJoin.Enabled = false;
}

private void Send_Click(object sender, System.EventArgs e)
{
//开始新线程
t2 = new Thread(new ThreadStart(Send)); //侦听线程
t2.Start();
}

/// <summary>
///
/// </summary>
public void Send()
{
Thread.Sleep(1000);

Byte [] buffer = null;

System.Text.Encoding ASCII = System.Text.Encoding.ASCII;

String s = this.txtMsgSend.Text ;

if( s.Length == 0 )
return ;

if(String.Compare(s,0,"@",0,1,true,CultureInfo.InvariantCulture) == 0)
{
m_Done = true;
s = m_szHostName + ":@";
Application.Exit();
}
else
{
s = m_szHostName + ":" + s;
}


buffer = new Byte[s.Length + 1];

int len = ASCII.GetBytes( s.ToCharArray(), 0, s.Length, buffer, 0);

int ecode = m_Client.Send(buffer, len, m_RemoteEP);

if(ecode <= 0)
{
AddToMain("Error in send : " + ecode);
}

t2.Abort();

}

public static void Terminate()
{
m_Client.DropMulticastGroup(m_GroupAddress);
}

/// <summary>
/// 初始化
/// </summary>
public void Initialize(string IP)
{

m_Client = new UdpClient(LocalPort);

//设置广播组的网络地址
m_GroupAddress = IPAddress.Parse(IP);

try
{ //加入广播组
m_Client.JoinMulticastGroup(m_GroupAddress, 100);
}
catch(Exception ex)
{
string mm = ex.Message ;
AddToMain("Unable to join multicast group" + ex.Message);
}

//设置网络端点
m_RemoteEP = new IPEndPoint( m_GroupAddress, RemotePort );

}

/// <summary>
///
/// </summary>
public void Listener()
{

Thread.Sleep(2000);

System.Text.En

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