前面已经贴了Socket的基本编程要点和步骤，这里继续贴一下关于异步Socket通信的代码。
using System.Net ;
using System.Net.Sockets ;
using System.IO ;
using System.Text ;
using System.Threading ;
public static ManualResetEvent allDone = new ManualResetEvent(false);
private Thread th;
private bool listenerRun = true ;
Socket listener;
private const int MAX_SOCKET=10;
protected override void Dispose( bool disposing )
{
try
{
listenerRun = false ;
th.Abort ( ) ;
th = null ;
listener.Close();
}
catch { }
}
//得到本机IP地址
//得到本机IP地址
public static IPAddress GetServerIP()
{
IPHostEntry ieh=Dns.GetHostByName(Dns.GetHostName());
return ieh.AddressList[0];
}
//侦听方法
private void Listen()
{
try
{
int nPort=int.Parse(this.txtLocalPort.Text);
IPAddress ServerIp=GetServerIP();
IPEndPoint iep=new IPEndPoint(ServerIp,nPort);
listener=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
listener.Bind(iep);
listener.Listen(10);
statusBar1.Panels[0].Text ="端口："+this.txtLocalPort.Text+"正在监听......";
while(listenerRun)
{
allDone.Reset();
listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);
allDone.WaitOne();
}
}
catch (System.Security.SecurityException )
{
MessageBox.Show ("防火墙安全错误！","错误",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
}
}
//异步回调函数
public void AcceptCallback(IAsyncResult ar)
{
Socket listener = (Socket)ar.AsyncState;
Socket client=listener.EndAccept(ar) ;
allDone.Set();
StateObject state = new StateObject();
state.workSocket = client;
//远端信息
EndPoint tempRemoteEP = client.RemoteEndPoint;
IPEndPoint tempRemoteIP = ( IPEndPoint )tempRemoteEP ;
string rempip=tempRemoteIP.Address.ToString();
string remoport=tempRemoteIP.Port.ToString();
IPHostEntry host = Dns.GetHostByAddress(tempRemoteIP.Address ) ;
string HostName = host.HostName;
statusBar1.Panels[1].Text ="接受["+HostName+"] "+rempip+":"+remoport+"远程计算机正确连接！" ;
this.listboxRemohost.Items.Add("["+HostName+"] "+rempip+":"+remoport);
client.BeginReceive( state.buffer,0, StateObject.BufferSize, 0,
new AsyncCallback(readCallback), state);
}
//异步接收回调函数
public void readCallback(IAsyncResult ar)
{
StateObject state = (StateObject) ar.AsyncState;
Socket handler = state.workSocket;
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
string strmsg=Encoding.ASCII.GetString(state.buffer,0,bytesRead);
state.sb.Append(strmsg);
string content = state.sb.ToString();
//远端信息
EndPoint tempRemoteEP = handler.RemoteEndPoint;
IPEndPoint tempRemoteIP = ( IPEndPoint )tempRemoteEP ;
string rempip=tempRemoteIP.Address.ToString();
string remoport=tempRemoteIP.Port.ToString();
IPHostEntry host = Dns.GetHostByAddress(tempRemoteIP.Address ) ;
string HostName = host.HostName;
statusBar1.Panels[1].Text ="正在接收["+HostName+"] "+rempip+":"+remoport+"的信息..." ;
string time = DateTime.Now.ToString ();
listboxRecv.Items.Add("("+time+") "+HostName+"：");
listboxRecv.Items.Add(strmsg) ;
if(content.IndexOf("\x99\x99")> -1)
{
statusBar1.Panels[1].Text ="信息接收完毕！" ;
//////////////////////////////////////////////////
//接收到完整的信息
// MessageBox.Show("接收到："+content);
string msg=poweryd.CodeParse(content);
Send(handler,msg);//异步发送
// Send(content);//用单独的socket发送
}
else
{
handler.BeginReceive(state.buffer,0,StateObject.BufferSize, 0,
new AsyncCallback(readCallback), state);
}
}
}
//异步发送
private void Send(Socket handler, String data)
{
byte[] byteData = Encoding.ASCII.GetBytes(data);
handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
// handler.Send(byteData);
}
#region //用单独的socket发送
private void Send(string data)
{
// string ip=this.txtRemoIP.Text;
// string port=this.txtRemoport.Text;
// IPAddress serverIp=IPAddress.Parse(ip);
// int serverPort=Convert.ToInt32(port);
// IPEndPoint iep=new IPEndPoint(serverIp,serverPort);
// Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
// socket.Connect(iep);
// byte[] byteMessage=Encoding.ASCII.GetBytes(data);
// socket.Send(byteMessage);
// socket.Shutdown(SocketShutdown.Both);
// socket.Close();
}
#endregion
//异步发送回调函数
//异步发送回调函数
private static void SendCallback(IAsyncResult ar)
{
try
{
Socket handler = (Socket) ar.AsyncState;
int bytesSent = handler.EndSend(ar);
MessageBox.Show("发送成功！");
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void btnListen_Click(object sender, System.EventArgs e)
{
th = new Thread (new ThreadStart(Listen));//以Listen过程来初始化线程实例
th.Start();//启动此线程
this.btnListen.Enabled=false;
}
private void btnClosenet_Click(object sender, System.EventArgs e)
{
try
{
listenerRun = false ;
th.Abort ( ) ;
th = null ;
listener.Close();
statusBar1.Panels[0].Text= "与客户端断开连接！";
statusBar1.Panels[1].Text= "";
}
catch
{
MessageBox.Show("连接尚未建立,断开无效！","警告");
}
}
private void btnExit_Click(object sender, System.EventArgs e)
{
try
{
listenerRun = false ;
th.Abort ( ) ;
th = null ;
listener.Close();
statusBar1.Panels[0].Text= "与客户端断开连接！";
statusBar1.Panels[1].Text= "";
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
Application.Exit();
}
}
//异步传递的状态对象
public class StateObject
{
public Socket workSocket = null;
public const int BufferSize = 1024;
public byte[] buffer = new byte[BufferSize];
public StringBuilder sb = new StringBuilder();
}
using System.Net ;
using System.Net.Sockets ;
using System.IO ;
using System.Text ;
using System.Threading ;
Socket socket;
int numbyte=1024;//一次接收到的字节数
private void btnConnect_Click(object sender, System.EventArgs e)
{
try
{
string ip=this.txtRemoIP.Text;
string port=this.txtRemoport.Text;
IPAddress serverIp=IPAddress.Parse(ip);
int serverPort=Convert.ToInt32(port);
IPEndPoint iep=new IPEndPoint(serverIp,serverPort);
IPHostEntry host = Dns.GetHostByAddress(iep.Address ) ;
string HostName = host.HostName;
socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
socket.Connect(iep);
IPEndPoint tempRemoteIP=( IPEndPoint )socket.LocalEndPoint;
statusBar1.Panels[0].Text ="端口："+tempRemoteIP.Port.ToString()+"正在监听......";
statusBar1.Panels[1].Text ="与远程计算机["+HostName+"] "+ip+":"+port+"建立连接！" ;
}
catch
{
statusBar1.Panels[0].Text = "无法连接到目标计算机！";
}
#region
// byteMessage=Encoding.ASCII.GetBytes(textBox1.Text+"99");
// socket.Send(byteMessage);
// byte[] bytes = new byte[1024];
// socket.Receive(bytes);
// string str=Encoding.Default.GetString(bytes);
// MessageBox.Show("接收到："+str);
// socket.Shutdown(SocketShutdown.Both);
// socket.Close();
#endregion
}
private void btnSend_Click(object sender, System.EventArgs e)
{
try
{
statusBar1.Panels[1].Text ="正在发送信息！" ;
string message=this.txtsend.Text;
SendInfo(message);
}
catch //异常处理
{
statusBar1.Panels[0].Text = "无法发送信息到目标计算机！";
}
}
private void SendInfo(string message)
{
#region
// string ip=this.txtip.Text;
// string port=this.txtport.Text;
//
// IPAddress serverIp=IPAddress.Parse(ip);
// int serverPort=Convert.ToInt32(port);
// IPEndPoint iep=new IPEndPoint(serverIp,serverPort);
// byte[] byteMessage;
//
// socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
// socket.Connect(iep);
#endregion
byte[] byteMessage=Encoding.ASCII.GetBytes(message+"\x99\x99");
socket.Send(byteMessage);
//远端信息
EndPoint tempRemoteEP = socket.RemoteEndPoint;
IPEndPoint tempRemoteIP = ( IPEndPoint )tempRemoteEP ;
string rempip=tempRemoteIP.Address.ToString();
string remoport=tempRemoteIP.Port.ToString();
IPHostEntry host = Dns.GetHostByAddress(tempRemoteIP.Address ) ;
string HostName = host.HostName;
//发送信息
string time1 = DateTime.Now.ToString();
listboxsend.Items.Add ("("+ time1 +") "+ HostName +":");
listboxsend.Items.Add (message ) ;
//发送完了，直接接收
StringBuilder sb = new StringBuilder();
while(true)
{
statusBar1.Panels[1].Text ="正在等待接收信息..." ;
byte[] bytes = new byte[numbyte];
int recvbytes=socket.Receive(bytes);
string strmsg=Encoding.Default.GetString(bytes);
string time2 = DateTime.Now.ToString();
listboxRecv.Items.Add("("+time2+") "+HostName+"：");
listboxRecv.Items.Add (strmsg) ;
sb.Append(strmsg);
if(sb.ToString().IndexOf("\x99\x99")>-1)
{
break;
}
}
statusBar1.Panels[1].Text ="接收信息完毕！" ;
//////////////////////////////////////
//代码解码
CodeParse(sb.ToString());
//////////////////////////////////////
socket.Shutdown(SocketShutdown.Both);
socket.Close();
}
