Socket 之 同步以及异步通信

用netstat侦听下端口状态

同步通信：

预定义结构体，同步通信没有多线程异步委托回调，所以无需预定义结构体

客户端Client：

class Program

{

static void Main()

{

try{

int port = 2000;

string host = "127.0.0.1";

IPAddress ip = IPAddress.Parse(host);

IPEndPoint ipe = new IPEndPoint(ip, port);//把ip和端口转化为IPEndPoint实例

Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket

Console.WriteLine("Conneting...");

c.Connect(ipe);//连接到服务器

string sendStr = "hello!This is a socket test";

byte[] bs = Encoding.ASCII.GetBytes(sendStr);

Console.WriteLine("Send Message");

c.Send(bs, bs.Length, 0);//发送测试信息

string recvStr = "";

byte[] recvBytes = new byte[1024];

int bytes;

bytes = c.Receive(recvBytes, recvBytes.Length, 0);//从服务器端接受返回信息

recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);

Console.WriteLine("Client Get Message:{0}", recvStr);//显示服务器返回信息

c.Close();

}

catch (ArgumentNullException e){

Console.WriteLine("ArgumentNullException: {0}", e);

}

catch (SocketException e){

Console.WriteLine("SocketException: {0}", e);

}

Console.WriteLine("Press Enter to Exit");

Console.ReadLine();

}

}

服务器端：

class Program

{

static void Main()

{

try{

int port = 2000;

string host = "127.0.0.1";

IPAddress ip = IPAddress.Parse(host);

IPEndPoint ipe = new IPEndPoint(ip, port);

Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket类

s.Bind(ipe);//绑定2000端口

s.Listen(0);//开始监听

Console.WriteLine("Wait for connect");

Socket temp = s.Accept();//为新建连接创建新的Socket。

Console.WriteLine("Get a connect");

string recvStr = "";

byte[] recvBytes = new byte[1024];

int bytes;

bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息

recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);

Console.WriteLine("Server Get Message:{0}", recvStr);//把客户端传来的信息显示出来

string sendStr = "Ok!Client Send Message Sucessful!";

byte[] bs = Encoding.ASCII.GetBytes(sendStr);

temp.Send(bs, bs.Length, 0);//返回客户端成功信息

temp.Close();

s.Close();

}

catch (ArgumentNullException e){

Console.WriteLine("ArgumentNullException: {0}", e);}

catch (SocketException e){

Console.WriteLine("SocketException: {0}", e);}

Console.WriteLine("Press Enter to Exit");

Console.ReadLine();

}

}

异步通信：

客户端Client：

预定义结构体，用于异步委托之间的传递。用户根据自己需要定制即可

public class StateObject

{

// Client socket.

public Socket workSocket = null;

// Size of receive buffer.

public const int BufferSize = 256;

// Receive buffer.

public byte[] buffer = new byte[BufferSize];

// Received data string.

public StringBuilder sb = new StringBuilder();

}

正文：

public class AsynchronousClient

{

// The port number for the remote device.

private const int port = 11000;

// ManualResetEvent instances signal completion.

private static ManualResetEvent connectDone = new ManualResetEvent(false);

private static ManualResetEvent sendDone = new ManualResetEvent(false);

private static ManualResetEvent receiveDone = new ManualResetEvent(false);

// The response from the remote device.

private static String response = String.Empty;

private static void StartClient(){

// Connect to a remote device.

try{

// Establish the remote endpoint for the socket.

// The name of the remote device is "host.contoso.com".

IPHostEntry ipHostInfo = Dns.Resolve("host.contoso.com");

IPAddress ipAddress = ipHostInfo.AddressList[0];

IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);

// Create a TCP/IP socket.

Socket client = new Socket(AddressFamily.InterNetwork,

SocketType.Stream, ProtocolType.Tcp);

// Connect to the remote endpoint.

client.BeginConnect(remoteEP,

new AsyncCallback(ConnectCallback), client);

connectDone.WaitOne();

// Send test data to the remote device.

Send(client, "This is a test<EOF>");

sendDone.WaitOne();

// Receive the response from the remote device.

Receive(client);

receiveDone.WaitOne();

// Write the response to the console.

Console.WriteLine("Response received : {0}", response);

// Release the socket.

client.Shutdown(SocketShutdown.Both);

client.Close();

}

catch (Exception e){

Console.WriteLine(e.ToString());}

}

private static void ConnectCallback(IAsyncResult ar)

{

try{

// Retrieve the socket from the state object.

Socket client = (Socket)ar.AsyncState;

// Complete the connection.

client.EndConnect(ar);

Console.WriteLine("Socket connected to {0}",

client.RemoteEndPoint.ToString());

// Signal that the connection has been made.

connectDone.Set();

}

catch (Exception e){

Console.WriteLine(e.ToString());}

}

private static void Receive(Socket client)

{

try{

// Create the state object.

StateObject state = new StateObject();

state.workSocket = client;

// Begin receiving the data from the remote device.

client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

new AsyncCallback(ReceiveCallback), state);

}

catch (Exception e){

Console.WriteLine(e.ToString());}

}

private static void ReceiveCallback(IAsyncResult ar)

{

try{

// Retrieve the state object and the client socket

// from the asynchronous state object.

StateObject state = (StateObject)ar.AsyncState;

Socket client = state.workSocket;

// Read data from the remote device.

int bytesRead = client.EndReceive(ar);

if (bytesRead > 0){

// There might be more data, so store the data received so far.

state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

// Get the rest of the data.

client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

new AsyncCallback(ReceiveCallback), state);

}

else{

// All the data has arrived; put it in response.

if (state.sb.Length > 1)

{

response = state.sb.ToString();

}

// Signal that all bytes have been received.

receiveDone.Set();

}

}

catch (Exception e){

Console.WriteLine(e.ToString());}

}

private static void Send(Socket client, String data)

{

// Convert the string data to byte data using ASCII encoding.

byte[] byteData = Encoding.ASCII.GetBytes(data);

// Begin sending the data to the remote device.

client.BeginSend(byteData, 0, byteData.Length, 0,

new AsyncCallback(SendCallback), client);

}

private static void SendCallback(IAsyncResult ar)

{

try{

// Retrieve the socket from the state object.

Socket client = (Socket)ar.AsyncState;

// Complete sending the data to the remote device.

int bytesSent = client.EndSend(ar);

Console.WriteLine("Sent {0} bytes to server.", bytesSent);

// Signal that all bytes have been sent.

sendDone.Set();

}

catch (Exception e){

Console.WriteLine(e.ToString());}

}

public static int Main(String[] args)

{

StartClient();

return 0;

}

}

服务器端Server：

预定义结构体，用于异步委托之间的传递。同客户端的一致。不再赘述

正文：

// State object for reading client data asynchronously

public class AsynchronousSocketListener

{

// Thread signal.

public static ManualResetEvent allDone = new ManualResetEvent(false);

public AsynchronousSocketListener(){}

public static void StartListening()

{

// Data buffer for incoming data.

byte[] bytes = new Byte[1024];

// Establish the local endpoint for the socket.

// The DNS name of the computer

// running the listener is "host.contoso.com".

//IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());

IPHostEntry ipHostInfo = Dns.Resolve("127.0.0.1");

IPAddress ipAddress = ipHostInfo.AddressList[0];

IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);

// 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.

try{

listener.Bind(localEndPoint);

listener.Listen(100);

while (true){

// Set the event to nonsignaled state.

allDone.Reset();

// Start an asynchronous socket to listen for connections.

Console.WriteLine("Waiting for a connection...");

listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);

// Wait until a connection is made before continuing.

allDone.WaitOne();

}

}

catch (Exception e){

Console.WriteLine(e.ToString());}

Console.WriteLine("\nPress ENTER to continue...");

Console.Read();

}

public static void AcceptCallback(IAsyncResult ar)

{

// Signal the main thread to continue.

allDone.Set();

// Get the socket that handles the client request.

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);

}

public static void ReadCallback(IAsyncResult ar)

{

String content = String.Empty;

// Retrieve the state object and the handler socket

// from the asynchronous state object.

StateObject state = (StateObject)ar.AsyncState;

Socket handler = state.workSocket;

// Read data from the client socket.

int bytesRead = handler.EndReceive(ar);

if (bytesRead > 0)

{

// There    might be more data, so store the data received so far.

state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

// Check for end-of-file tag. If it is not there, read

// more data.

content = state.sb.ToString();

if (content.IndexOf("<EOF>") > -1){

// All the data has been read from the

// client. Display it on the console.

Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",

content.Length, content);

// Echo the data back to the client.

Send(handler, "Server return :" + content);

}

else{

// Not all data received. Get more.

handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

new AsyncCallback(ReadCallback), state);

}

}

}

private static void Send(Socket handler, String data){

// Convert the string data to byte data using ASCII encoding.

byte[] byteData = Encoding.ASCII.GetBytes(data);

// Begin sending the data to the remote device.

handler.BeginSend(byteData, 0, byteData.Length, 0,

new AsyncCallback(SendCallback), handler);

}

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.

int bytesSent = handler.EndSend(ar);

Console.WriteLine("Sent {0} bytes to client.", bytesSent);

handler.Shutdown(SocketShutdown.Both);

handler.Close();

}

catch (Exception e){

Console.WriteLine(e.ToString());

}

}

public static int Main(String[] args)

{

StartListening();

return 0;

}

}