C# 客户端仅在关闭时接收数据包
基本上我制作了两个C#应用程序,一个客户端和一个服务器。客户端连接到服务器(通过套接字),然后发送一个包含一些文本的数据包,服务器应该回复。 我的问题是:服务器只在关闭(ALT+F4)时发送(或客户端接收)响应数据包。我需要一些帮助。我将在下面复制粘贴这两个项目的源代码。 客户:C# 客户端仅在关闭时接收数据包,c#,sockets,packet,C#,Sockets,Packet,基本上我制作了两个C#应用程序,一个客户端和一个服务器。客户端连接到服务器(通过套接字),然后发送一个包含一些文本的数据包,服务器应该回复。 我的问题是:服务器只在关闭(ALT+F4)时发送(或客户端接收)响应数据包。我需要一些帮助。我将在下面复制粘贴这两个项目的源代码。 客户: 公共类StateObject { 公共套接字skt=null; public const int BufferSize=256; 公共字节[]缓冲区=新字节[BufferSize]; 公共StringBuilder s
公共类StateObject
{
公共套接字skt=null;
public const int BufferSize=256;
公共字节[]缓冲区=新字节[BufferSize];
公共StringBuilder sb=新StringBuilder();
}
公共类异步客户端
{
专用常量int端口=11000;
专用静态手动重置事件已完成=
新手动重置事件(错误);
私有静态手动重置事件sendDone=
新手动重置事件(错误);
私有静态手动重置事件接收完成=
新手动重置事件(错误);
私有静态字符串响应=String.Empty;
公共静态字符串命令;
公共静态套接字客户端;
公共静态void StartClient()
{
尝试
{
IPHostEntry ipHostInfo=Dns.GetHostEntry(IPAddress.Parse(“127.0.0.1”);
IPAddress IPAddress=ipHostInfo.AddressList[0];
IPEndPoint remoteEP=新IPEndPoint(IPAddress.Parse(“127.0.0.1”),端口);
客户端=新套接字(AddressFamily.InterNetwork,
流,ProtocolType.Tcp);
client.BeginConnect(remoteEP,
新的异步回调(ConnectCallback),客户端);
connectDone.WaitOne();
while(true)
{
command=Console.ReadLine();
如果(命令==“退出”)
{
控制台写入线(“终止…”);
client.Shutdown(SocketShutdown.Both);
client.Close();
环境。退出(0);
}
其他的
{
发送(客户端,命令+“”);
sendDone.WaitOne();
接收(客户);
receiveDone.WaitOne();
WriteLine(“收到的响应:{0}”,ProcessResponse(响应));
client.Shutdown(SocketShutdown.Both);
client.Close();
}
//Console.CancelKeyPress+=(发送方,e)=>
//{
//控制台写入线(“终止…”);
//client.Shutdown(SocketShutdown.Both);
//client.Close();
//环境。退出(0);
//};
}
}
捕获(例外e)
{
Console.WriteLine(如ToString());
}
}
静态公共字符串ProcessResponse(字符串pkt)
{
字符串响应=null;
response=pkt.Replace(“,”);
返回响应;
}
专用静态无效连接回调(IAsyncResult ar)
{
尝试
{
套接字客户端=(套接字)ar.AsyncState;
客户端.EndConnect(ar);
WriteLine(“连接到{0}的套接字”,
client.RemoteEndPoint.ToString());
connectDone.Set();
}
捕获(例外e)
{
Console.WriteLine(如ToString());
}
}
私有静态void接收(套接字客户端)
{
尝试
{
StateObject状态=新的StateObject();
state.skt=客户端;
client.BeginReceive(state.buffer,0,StateObject.BufferSize,0,
新建异步回调(ReceiveCallback),状态);
}
捕获(例外e)
{
Console.WriteLine(如ToString());
}
}
私有静态void ReceiveCallback(IAsyncResult ar)
{
尝试
{
StateObject状态=(StateObject)ar.AsyncState;
socketclient=state.skt;
int bytesRead=client.EndReceive(ar);
如果(字节读取>0)
{
state.sb.Append(Encoding.ASCII.GetString(state.buffer,0,bytesRead));
client.BeginReceive(state.buffer,0,StateObject.BufferSize,0,
新建异步回调(ReceiveCallback),状态);
}
其他的
{
如果(说明长度>1)
{
response=state.sb.ToString();
}
receiveDone.Set();
}
}
捕获(例外e)
{
Console.WriteLine(如ToString());
}
}
私有静态void发送(套接字客户端、字符串数据)
{
byte[]byteData=Encoding.ASCII.GetBytes(数据);
BeginSend(byteData,0,byteData.Length,0,新的异步回调(SendCallback),client);
}
私有静态void SendCallback(IAsyncResult ar)
{
尝试
{
套接字客户端=(套接字)ar.AsyncState;
int bytesent=client.EndSend(ar);
WriteLine(“向服务器发送了{0}个字节。”,bytesSent);
sendDone.Set();
}
捕获(例外e)
{
Console.WriteLine(如ToString());
}
}
公共静态int Main(字符串[]args)
{
StartClient();
返回0;
}
服务器:
public class Program
{
public class StateObject
{
public Socket skt = null;
public const int buffersize = 1024;
public byte[] buffer = new byte[buffersize];
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousSocketListener
{
public static ManualResetEvent allDone = new ManualResetEvent(false);
public AsynchronousSocketListener() { }
public static Socket handler;
public static void StartListening()
{
byte[] bytes = new Byte[1024];
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 11000);
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
while (true)
{
allDone.Reset();
Console.WriteLine("Waiting for a connection...");
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
allDone.WaitOne();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
Console.WriteLine("\nPress ENTER to continue...");
Console.Read();
}
public static void AcceptCallback(IAsyncResult ar)
{
allDone.Set();
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
StateObject state = new StateObject();
state.skt = handler;
handler.BeginReceive(state.buffer, 0, StateObject.buffersize, 0, new AsyncCallback(ReadCallback), state);
}
public static void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.skt;
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
Console.WriteLine("Read {0} bytes from socket. \n Data : {1}", content.Length, ProcessResponse(content));
Send(handler, content);
}
else
{
handler.BeginReceive(state.buffer, 0, StateObject.buffersize, 0,
new AsyncCallback(ReadCallback), state);
}
}
}
private static void Send(Socket handler, String data)
{
byte[] byteData = Encoding.ASCII.GetBytes(data);
handler.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), handler);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
handler = (Socket)ar.AsyncState;
int bytesSent = handler.EndSend(ar);
Console.WriteLine("Sent {0} bytes to client.", bytesSent);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
static public string ProcessResponse(String pkt)
{
string response = null;
response = pkt.Replace("<EOF>", "");
return response;
}
}
public static void Main(string[] args)
{
AsynchronousSocketListener.StartListening();
}
}
公共类程序
{
公共类状态对象
{
公共套接字skt=null;
public const int buffersize=1024;
公共字节[]缓冲区=新字节[buffersize];
公共StringBuilder sb=新StringBuilder();
}
公共类异步SocketListener
{
public static ManualResetEvent allDone=新的ManualResetEvent(false);
公共异步SocketListener(){}
公共静态套接字处理器;
公共静态侦听()
{
字节[]字节=新字节[1024];
IPHostEntry ipHostInfo=Dns.Resolve(Dns.GetHostName());
public class Program
{
public class StateObject
{
public Socket skt = null;
public const int buffersize = 1024;
public byte[] buffer = new byte[buffersize];
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousSocketListener
{
public static ManualResetEvent allDone = new ManualResetEvent(false);
public AsynchronousSocketListener() { }
public static Socket handler;
public static void StartListening()
{
byte[] bytes = new Byte[1024];
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 11000);
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
while (true)
{
allDone.Reset();
Console.WriteLine("Waiting for a connection...");
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
allDone.WaitOne();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
Console.WriteLine("\nPress ENTER to continue...");
Console.Read();
}
public static void AcceptCallback(IAsyncResult ar)
{
allDone.Set();
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
StateObject state = new StateObject();
state.skt = handler;
handler.BeginReceive(state.buffer, 0, StateObject.buffersize, 0, new AsyncCallback(ReadCallback), state);
}
public static void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.skt;
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
Console.WriteLine("Read {0} bytes from socket. \n Data : {1}", content.Length, ProcessResponse(content));
Send(handler, content);
}
else
{
handler.BeginReceive(state.buffer, 0, StateObject.buffersize, 0,
new AsyncCallback(ReadCallback), state);
}
}
}
private static void Send(Socket handler, String data)
{
byte[] byteData = Encoding.ASCII.GetBytes(data);
handler.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), handler);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
handler = (Socket)ar.AsyncState;
int bytesSent = handler.EndSend(ar);
Console.WriteLine("Sent {0} bytes to client.", bytesSent);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
static public string ProcessResponse(String pkt)
{
string response = null;
response = pkt.Replace("<EOF>", "");
return response;
}
}
public static void Main(string[] args)
{
AsynchronousSocketListener.StartListening();
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
try
{
StateObject state = (StateObject)ar.AsyncState;
Socket client = state.skt;
int bytesRead = client.EndReceive(ar);
if (bytesRead > 0)
{
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
else
{
if (state.sb.Length > 1)
{
response = state.sb.ToString();
}
receiveDone.Set();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
if (bytesRead > 0)
{
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
// it's not a "response" unless it's terminated with "<EOF>" right?
response = state.sb.ToString();
if (response.IndexOf("<EOF>") != -1)
{
state.sb.Clear();
receiveDone.Set();
}
else
{
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
}
else
{
if (state.sb.Length > 1)
{
response = state.sb.ToString(); // this is a partial response, not terminated with "<EOF>"
}
receiveDone.Set();
}