TcpClient.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using log4net;
using System.Reflection;
namespace OnlineStore.Common
{
public class TcpClient
{
// public static readonly ILog LOGGER = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
public delegate void HandleMessage(string message);
private Socket m_clientSocket;
private byte[] m_receiveBuffer = new byte[1024];
private HandleMessage onReceived;
/// <summary>
/// 当前连接状态
/// </summary>
public bool IsConnected()
{
if (m_clientSocket == null)
{
return false;
}
if (m_clientSocket.Connected)
{
return true;
}
#region remarks
/********************************************************************************************
* 当Socket.Conneted为false时， 如果您需要确定连接的当前状态，请进行非阻塞、零字节的 Send 调用。
* 如果该调用成功返回或引发 WAEWOULDBLOCK 错误代码 (10035)，则该套接字仍然处于连接状态；
* 否则，该套接字不再处于连接状态。
* Depending on http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.connected.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2
********************************************************************************************/
#endregion
#region 过程
// This is how you can determine whether a socket is still connected.
bool connectState = true;
bool blockingState = m_clientSocket.Blocking;
try
{
byte[] tmp = new byte[1];
m_clientSocket.Blocking = false;
m_clientSocket.Send(tmp, 0, 0);
//Console.WriteLine("Connected!");
connectState = true; //若Send错误会跳去执行catch体，而不会执行其try体里其之后的代码
}
catch (SocketException e)
{
// 10035 == WSAEWOULDBLOCK
if (e.NativeErrorCode.Equals(10035))
{
connectState = true;
}
else
{
connectState = false;
}
}
finally
{
m_clientSocket.Blocking = blockingState;
}
//Console.WriteLine("Connected: {0}", client.Connected);
return connectState;
#endregion
}
/// <summary>
/// 连接服务器
/// </summary>
public bool connect(string serverIP, int serverPort, HandleMessage HandleMessage)
{
m_clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Parse(serverIP), serverPort);
try
{
m_clientSocket.Connect(remoteEndPoint);
if (m_clientSocket.Connected)
{
m_clientSocket.BeginReceive(m_receiveBuffer, 0, m_receiveBuffer.Length, 0, new AsyncCallback(ReceiveCallBack), null);
onReceived = HandleMessage;
LogUtil.info( "Connect to " + serverIP + ":" + serverPort + " success!");
return true;
}
else
{
LogUtil.info( "Connect to " + serverIP + ":" + serverPort + " fail!");
}
}
catch (Exception ex)
{
LogUtil.error("Connect to " + serverIP + ":" + serverPort + " fail!" + ex.ToString(),3);
m_clientSocket = null;
}
return false;
}
/// <summary>
/// 断开连接
/// </summary>
public void close()
{
if (m_clientSocket != null)
{
m_clientSocket.Close();
LogUtil.info("Socket closed!");
}
else
{
LogUtil.error("No socket is running!");
}
}
/// <summary>
/// 发送信息
/// </summary>
public void send(string strSendData)
{
byte[] sendBuffer = new byte[1024];
sendBuffer = Encoding.UTF8.GetBytes(strSendData);
if (m_clientSocket != null && m_clientSocket.Connected)
{
m_clientSocket.Send(sendBuffer);
LogUtil.debug("Send >> " + strSendData);
}
}
private void ReceiveCallBack(IAsyncResult ar)
{
try
{
if (m_clientSocket != null && m_clientSocket.Connected)
{
int REnd = m_clientSocket.EndReceive(ar);
string strReceiveData = Encoding.UTF8.GetString(m_receiveBuffer, 0, REnd);
onReceived(strReceiveData);
m_clientSocket.BeginReceive(m_receiveBuffer, 0, m_receiveBuffer.Length, 0, new AsyncCallback(ReceiveCallBack), null);
}
}
catch (Exception ex)
{
LogUtil.error("socket received error:" + ex.ToString(),4);
}
}
}
}