C#通讯编程
http://topic.csdn.net/u/20080623/08/4bbd2475-45f1-42e3-a613-16b094759ade.html
Socket通讯:
public class XmlSocket
{
//异步socket诊听
// Incoming data from client.从客户端传来的数据
public static string data = null;
// Thread signal.线程 用一个指示是否将初始状态设置为终止的布尔值初始化 ManualResetEvent 类的新实例。
public static ManualResetEvent allDone = new ManualResetEvent(false);
//static void Main(string[] args)
//{
// StartListening();
//}
public static void StartListening()
{
// Data buffer for incoming data. 传入数据缓冲
byte[] bytes = new Byte[1024];
// Establish the local endpoint for the socket. 建立本地端口
// The DNS name of the computer
// running the listener is "host.contoso.com".
IPAddress ipAddress;
String ipString = ConfigurationManager.AppSettings.Get("SocketIP");
if (ipString==null || ipString ==String.Empty)
{
IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
ipAddress = ipHostInfo.AddressList[0];
}
else
{
ipAddress = IPAddress.Parse(ipString);
}
int port;
String portString = ConfigurationManager.AppSettings.Get("SocketPort");
if (portString==null || portString==String.Empty)
{
port = 11001;
}
else
{
port = int.Parse(portString);
}
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Bind the socket to the local endpoint and listen for incoming connections.绑定端口和数据
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
while (true)
{
// Set the event to nonsignaled state.设置无信号状态的事件
allDone.Reset();
// Start an asynchronous socket to listen for connections.重新 启动异步连接
listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
// Wait until a connection is made before continuing.等待连接创建后继续
allDone.WaitOne();
}
}
catch (Exception e)
{
//
}
}
public static void AcceptCallback(IAsyncResult ar)
{
try
{
// Signal the main thread to continue.接受回调方法 该方法的此节向主应用程序线程发出信号，
//让它继续处理并建立与客户端的连接
allDone.Set();
// Get the socket that handles the client request.获取客户端请求句柄
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
catch (Exception e)
{
//
}
}
/// <summary>
/// 与接受回调方法一样，读取回调方法也是一个 AsyncCallback 委托。
/// 该方法将来自客户端套接字的一个或多个字节读入数据缓冲区，然后再次调用 BeginReceive 方法，直到客户端发送的数据完成为止。
/// 从客户端读取整个消息后，在控制台上显示字符串，并关闭处理与客户端的连接的服务器套接字。
/// </summary>
/// <param name="ar">IAsyncResult 委托</param>
public static void ReadCallback(IAsyncResult ar)
{
try
{
String content = String.Empty;
// Retrieve the state object and the handler socket创建自定义的状态对象 from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;//处理的句柄
// Read data from the client socket. 读出
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
//业务代码
string result = DoSomeThing(...);
String len = Encoding.UTF8.GetBytes(result).Length.ToString().PadLeft(8, '0');
log.writeLine(len);
Send(len + result, handler);
}
}
catch (Exception e)
{
//
}
}
private static void Send(String data, Socket handler)
{
try
{
// Convert the string data to byte data using UTF8 encoding.
byte[] byteData = Encoding.UTF8.GetBytes(data);
// Begin sending the data to the remote device.
handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
}
catch (Exception e)
{
//
}
}
/// <summary>
/// 发送
/// </summary>
/// <param name="ar"></param>
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket handler = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.向远端发送数据
int bytesSent = handler.EndSend(ar);
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,new AsyncCallback(ReadCallback), state);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception e)
{
//
}
}
public static void StopListening()
{
allDone.Close();
log.close();
}
/// <summary>
/// 具体处理业务的方法
/// </summary>
/// <returns></returns>
private static string DoSomething(int i)
{
//具体业务代码,返回需要返回的字符串信息
}
/// <summary>
/// 写日志方法
/// </summary>
/// <param name="strLog">写入内容</param>
public static void WriteLog(string strLog)
{
//写入日志代码
}
}
/// 线程执行体,转发消息
/// </summary>
/// <param name="obj">传递给线程执行体的用户名，用以与用户通信 </param>
private void ThreadFunc(object obj)
{
//通过转发表得到当前用户套接字
Socket clientSkt = _transmit_tb[obj] as Socket;
//主循环
while (true)
{
try
{ //接受第一个数据包。
//由于程序逻辑结构简单，所以在这里对客户机发送的第一个包内容作逐一判断，
//这里的实现不够优雅，但不失为此简单模型的一个解决之道。
byte[] packetBuff = new byte[_maxPacket];
clientSkt.Receive(packetBuff);
string _str = Encoding.Unicode.GetString(packetBuff).TrimEnd('\0');
//如果是发给不在线好友的信息
if (_str.StartsWith("cmd::FriendMessage"))
{
string UserName = _str.Substring("cmd::FriendMessage".Length, 20).Trim();
string MessageS = _str.Substring("cmd::FriendMessage".Length + 20, _str.Length - "cmd::FriendMessage".Length - 20);
SaveMessage(obj as string, UserName, MessageS);
continue;
}
//如果是离线请求
if (_str.StartsWith("cmd::RequestLogout"))
{
_transmit_tb.Remove(obj);
UpdateFriendList((string)obj, false, "");
// string svrlog = string.Format("[系统消息]用户 {0} 在 {1} 已断开... 当前在线人数: {2}\r\n\r\n", obj, DateTime.Now, _transmit_tb.Count);
// Console.WriteLine(svrlog);
//向所有客户机发送系统消息
//foreach (DictionaryEntry de in _transmit_tb)
//{
// string _clientName = de.Key as string;
// Socket _clientSkt = de.Value as Socket;
// _clientSkt.Send(Encoding.Unicode.GetBytes(svrlog));
//}
Thread.CurrentThread.Abort();
}
//如果是请求好友列表
if (_str.StartsWith("cmd::RequestFriendList"))
{
SerializeFriendList(obj, clientSkt);
// 将该用户不在线时的信息发送给用户
DataTable TabMessage = ReadMessage(obj as string);
if (TabMessage != null)
{
foreach (DataRow myrow in TabMessage.Rows)
{
if (myrow["SendUserName"].ToString() == "System::Message")
{
clientSkt.Send(Encoding.Unicode.GetBytes(myrow["Message"].ToString()));
}
else
{
clientSkt.Send(Encoding.Unicode.GetBytes("cmd::FriendMessage" + myrow["SendUserName"].ToString().PadRight(20, ' ') + myrow["Message"].ToString()));
}
}
} //这里不需要再继续接受后继数据包了，跳出当前循环体。
continue;
}
////如果是请求好友列表
//if (_str.StartsWith("cmd::RequestOnLineList"))
//{
// byte[] onlineBuff = SerializeOnlineList();
// //先发送响应信号，用户客户机的判断
// clientSkt.Send(Encoding.Unicode.GetBytes("cmd::RequestOnLineList"));
// clientSkt.Send(onlineBuff);
// //这里不需要再继续接受后继数据包了，跳出当前循环体。
// continue;
//} //查找用户
if (_str.StartsWith("Find::FindFriend"))
{
DataTable TabFind = TabUser.Clone();
DataRow [] FindRow =null ;
string UserName = _str.Substring("Find::FindFriend".Length, _str.Length - "Find::FindFriend".Length);
if (UserName.Equals("Find::WhoOnLine"))
{ //看谁在线
FindRow = TabUser.Select(" ZX = 1");
}
else//精确查找
{
FindRow = TabUser.Select("UserName = '" + UserName + "'");
}
foreach (DataRow myrow in FindRow)
{
TabFind.ImportRow(myrow);
}
clientSkt.Send(Encoding.Unicode.GetBytes("Find::FindFriend"));
IFormatter format = new BinaryFormatter();
MemoryStream stream = new MemoryStream();
format.Serialize(stream, TabFind);
stream.Position = 0;
byte[] ret = new byte[_maxPacket];
int count = 0;
count = stream.Read(ret, 0, _maxPacket);
while (count >0)
{
clientSkt.Send(ret);
count = stream.Read(ret, 0, _maxPacket);
}
clientSkt.Send(Encoding.Unicode.GetBytes("Find::FindFriendEnd"));
stream.Close();
TabFind = null;
FindRow = null; //这里不需要再继续接受后继数据包了，跳出当前循环体。
continue;
} //请求添加好友
if (_str.StartsWith("Find::AddFriendAsk"))
{
string UserName = _str.Substring("Find::AddFriendAsk".Length, _str.Length - "Find::AddFriendAsk".Length);
//通过转发表查找接收方的套接字
if (_transmit_tb.Count != 0 && _transmit_tb.ContainsKey(UserName))
{
Socket receiverSkt = _transmit_tb[UserName] as Socket;
receiverSkt.Send(Encoding.Unicode.GetBytes("Find::AddFriendAsk" + obj as string));
}
//这里不需要再继续接受后继数据包了，跳出当前循环体。
continue;
}
//回复答应添加好友
if (_str.StartsWith("Find::AddFriendYes"))
{
string UserName = _str.Substring("Find::AddFriendYes".Length, _str.Length - "Find::AddFriendYes".Length);
//// 保存数据
DataTable TabmyFriend = new DataTable() ;
//保存该用户
TabmyFriend.ReadXml(MyPath + "\\UserFriend\\" + obj as string + ".xml");
DataRow newRow = TabmyFriend.NewRow();
newRow["UserName"] = UserName;
TabmyFriend.Rows.Add(newRow);
TabmyFriend.WriteXml(MyPath + "\\UserFriend\\" + obj as string + ".xml", XmlWriteMode.WriteSchema, false);
//保存其好友
TabmyFriend = new DataTable();
TabmyFriend.ReadXml(MyPath + "\\UserFriend\\" + UserName + ".xml");
DataRow newRow1 = TabmyFriend.NewRow();
newRow1["UserName"] = obj as string;
TabmyFriend.Rows.Add(newRow1);
TabmyFriend.WriteXml(MyPath + "\\UserFriend\\" + UserName + ".xml", XmlWriteMode.WriteSchema, false);
TabmyFriend = null;
SerializeFriendList(obj, clientSkt);
//"开始"按钮事件
private void button1_Click(object sender, System.EventArgs e) {
//取得预保存的文件名
string fileName=textBox3.Text.Trim();
//远程主机
string hostName=textBox1.Text.Trim();
//端口
int port=Int32.Parse(textBox2.Text.Trim());
//得到主机信息
IPHostEntry ipInfo=Dns.GetHostByName(hostName);
//取得IPAddress[]
IPAddress[] ipAddr=ipInfo.AddressList;
//得到ip
IPAddress ip=ipAddr[0];
//组合出远程终结点
IPEndPoint hostEP=new IPEndPoint(ip,port);
//创建Socket 实例
Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
try
{
//尝试连接
socket.Connect(hostEP);
}
catch(Exception se)
{
MessageBox.Show("连接错误"+se.Message,"提示信息
,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information);
}
//发送给远程主机的请求内容串
string sendStr="GET / HTTP/1.1\r\nHost: " + hostName +
"\r\nConnection: Close\r\n\r\n";
//创建bytes字节数组以转换发送串
byte[] bytesSendStr=new byte[1024];
//将发送内容字符串转换成字节byte数组
bytesSendStr=Encoding.ASCII.GetBytes(sendStr);
try
{
//向主机发送请求
socket.Send(bytesSendStr,bytesSendStr.Length,0);
}
catch(Exception ce)
{
MessageBox.Show("发送错误:"+ce.Message,"提示信息
,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information);
}
//声明接收返回内容的字符串
string recvStr="";
//声明字节数组，一次接收数据的长度为1024字节
byte[] recvBytes=new byte[1024];
//返回实际接收内容的字节数
int bytes=0;
//循环读取，直到接收完所有数据
while(true)
{
bytes=socket.Receive(recvBytes,recvBytes.Length,0);
//读取完成后退出循环
if(bytes〈=0)
break;
//将读取的字节数转换为字符串
recvStr+=Encoding.ASCII.GetString(recvBytes,0,bytes);
}
//将所读取的字符串转换为字节数组
byte[] content=Encoding.ASCII.GetBytes(recvStr);
try
{
//创建文件流对象实例
FileStream fs=new FileStream(fileName,FileMode.OpenOrCreate,FileAccess.ReadWrite);
//写入文件
fs.Write(content,0,content.Length);
}
catch(Exception fe)
{
MessageBox.Show("文件创建/写入错误:"+fe.Message,"提示信息",MessageBoxButtons.RetryCancel,MessageBoxIcon.Information);
}
//禁用Socket
socket.Shutdown(SocketShutdown.Both);
//关闭Socket
socket.Close();
}
}
