所以我的客户端服务器程序工作正常，但现在我遇到了一个问题，我没有一个如何解决它的线索。所以我的客户端使用异步套接字连接到服务器。但是当它试图获得异步结果时，它什么都没包含。它处理套接字并从头开始。这是我的代码（客户端）：
public class Client
{
/// <summary>
/// Occurs as a result of an unrecoverable issue with the client.
/// </summary>
public event ClientFailEventHandler ClientFail;
/// <summary>
/// Represents a method that will handle failure of the client.
/// </summary>
/// <param name="s">The client that has failed.</param>
/// <param name="ex">The exception containing information about the cause of the client's failure.</param>
public delegate void ClientFailEventHandler(Client s, Exception ex);
/// <summary>
/// Fires an event that informs subscribers that the client has failed.
/// </summary>
/// <param name="ex">The exception containing information about the cause of the client's failure.</param>
private void OnClientFail(Exception ex)
{
var handler = ClientFail;
if (handler != null)
{
handler(this, ex);
}
}
/// <summary>
/// Occurs when the state of the client has changed.
/// </summary>
public event ClientStateEventHandler ClientState;
/// <summary>
/// Represents the method that will handle a change in the client's state
/// </summary>
/// <param name="s">The client which changed its state.</param>
/// <param name="connected">The new connection state of the client.</param>
public delegate void ClientStateEventHandler(Client s, bool connected);
/// <summary>
/// Fires an event that informs subscribers that the state of the client has changed.
/// </summary>
/// <param name="connected">The new connection state of the client.</param>
private void OnClientState(bool connected)
{
if (Connected == connected) return;
Connected = connected;
var handler = ClientState;
if (handler != null)
{
handler(this, connected);
}
}
/// <summary>
/// Occurs when a packet is received from the server.
/// </summary>
public event ClientReadEventHandler ClientRead;
/// <summary>
/// Represents a method that will handle a packet from the server.
/// </summary>
/// <param name="s">The client that has received the packet.</param>
/// <param name="packet">The packet that has been received by the server.</param>
public delegate void ClientReadEventHandler(Client s, IPacket packet);
/// <summary>
/// Fires an event that informs subscribers that a packet has been received by the server.
/// </summary>
/// <param name="packet">The packet that has been received by the server.</param>
private void OnClientRead(IPacket packet)
{
var handler = ClientRead;
if (handler != null)
{
handler(this, packet);
}
}
/// <summary>
/// Occurs when a packet is sent by the client.
/// </summary>
public event ClientWriteEventHandler ClientWrite;
/// <summary>
/// Represents the method that will handle the sent packet.
/// </summary>
/// <param name="s">The client that has sent the packet.</param>
/// <param name="packet">The packet that has been sent by the client.</param>
/// <param name="length">The length of the packet.</param>
/// <param name="rawData">The packet in raw bytes.</param>
public delegate void ClientWriteEventHandler(Client s, IPacket packet, long length, byte[] rawData);
/// <summary>
/// Fires an event that informs subscribers that the client has sent a packet.
/// </summary>
/// <param name="packet">The packet that has been sent by the client.</param>
/// <param name="length">The length of the packet.</param>
/// <param name="rawData">The packet in raw bytes.</param>
private void OnClientWrite(IPacket packet, long length, byte[] rawData)
{
var handler = ClientWrite;
if (handler != null)
{
handler(this, packet, length, rawData);
}
}
/// <summary>
/// The type of the packet received.
/// </summary>
public enum ReceiveType
{
Header,
Payload
}
/// <summary>
/// The buffer size for receiving data in bytes.
/// </summary>
public int BUFFER_SIZE { get { return 1024 * 16; } } // 16KB
/// <summary>
/// The keep-alive time in ms.
/// </summary>
public uint KEEP_ALIVE_TIME { get { return 25000; } } // 25s
/// <summary>
/// The keep-alive interval in ms.
/// </summary>
public uint KEEP_ALIVE_INTERVAL { get { return 25000; } } // 25s
/// <summary>
/// The header size in bytes.
/// </summary>
public int HEADER_SIZE { get { return 4; } } // 4B
/// <summary>
/// The maximum size of a packet in bytes.
/// </summary>
public int MAX_PACKET_SIZE { get { return (1024 * 1024) * 5; } } // 5MB
/// <summary>
/// Returns an array containing all of the proxy clients of this client.
/// </summary>
public ReverseProxyClient[] ProxyClients
{
get
{
lock (_proxyClientsLock)
{
return _proxyClients.ToArray();
}
}
}
/// <summary>
/// Handle of the Client Socket.
/// </summary>
private Socket _handle;
/// <summary>
/// A list of all the connected proxy clients that this client holds.
/// </summary>
private List<ReverseProxyClient> _proxyClients;
/// <summary>
/// Lock object for the list of proxy clients.
/// </summary>
private readonly object _proxyClientsLock = new object();
/// <summary>
/// The buffer for incoming packets.
/// </summary>
private byte[] _readBuffer;
/// <summary>
/// The buffer for the client's incoming payload.
/// </summary>
private byte[] _payloadBuffer;
/// <summary>
/// The Queue which holds buffers to send.
/// </summary>
private readonly Queue<byte[]> _sendBuffers = new Queue<byte[]>();
/// <summary>
/// Determines if the client is currently sending packets.
/// </summary>
private bool _sendingPackets;
/// <summary>
/// Lock object for the sending packets boolean.
/// </summary>
private readonly object _sendingPacketsLock = new object();
/// <summary>
/// The Queue which holds buffers to read.
/// </summary>
private readonly Queue<byte[]> _readBuffers = new Queue<byte[]>();
/// <summary>
/// Determines if the client is currently reading packets.
/// </summary>
private bool _readingPackets;
/// <summary>
/// Lock object for the reading packets boolean.
/// </summary>
private readonly object _readingPacketsLock = new object();
/// <summary>
/// The temporary header to store parts of the header.
/// </summary>
/// <remarks>
/// This temporary header is used when we have i.e.
/// only 2 bytes left to read from the buffer but need more
/// which can only be read in the next Receive callback
/// </remarks>
private byte[] _tempHeader;
/// <summary>
/// Decides if we need to append bytes to the header.
/// </summary>
private bool _appendHeader;
// Receive info
private int _readOffset;
private int _writeOffset;
private int _tempHeaderOffset;
private int _readableDataLen;
private int _payloadLen;
private ReceiveType _receiveState = ReceiveType.Header;
/// <summary>
/// Gets if the client is currently connected to a server.
/// </summary>
public bool Connected { get; private set; }
/// <summary>
/// The packet serializer.
/// </summary>
protected Serializer Serializer { get; set; }
private const bool encryptionEnabled = true;
private const bool compressionEnabled = true;
protected Client()
{
_proxyClients = new List<ReverseProxyClient>();
_readBuffer = new byte[BUFFER_SIZE];
_tempHeader = new byte[HEADER_SIZE];
}
/// <summary>
/// Attempts to connect to the specified ip address on the specified port.
/// </summary>
/// <param name="ip">The ip address to connect to.</param>
/// <param name="port">The port of the host.</param>
protected void Connect(IPAddress ip, ushort port)
{
try
{
Disconnect();
_handle = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
_handle.SetKeepAliveEx(KEEP_ALIVE_INTERVAL, KEEP_ALIVE_TIME);
_handle.Connect(ip, port);
if (_handle.Connected)
{
_handle.BeginReceive(_readBuffer, 0, _readBuffer.Length, SocketFlags.None, AsyncReceive, null);
OnClientState(true);
}
}
catch (Exception ex)
{
OnClientFail(ex);
}
}
private void AsyncReceive(IAsyncResult result)
{
int bytesTransferred; // error occurs here
try
{
bytesTransferred = _handle.EndReceive(result);
if (bytesTransferred <= 0)
throw new Exception("no bytes transferred");
}
catch (NullReferenceException)
{
return;
}
catch (ObjectDisposedException)
{
return;
}
catch (Exception)
{
Disconnect();
return;
}
byte[] received = new byte[bytesTransferred];
try
{
Array.Copy(_readBuffer, received, received.Length);
}
catch (Exception ex)
{
OnClientFail(ex);
return;
}
lock (_readBuffers)
{
_readBuffers.Enqueue(received);
}
lock (_readingPacketsLock)
{
if (!_readingPackets)
{
_readingPackets = true;
ThreadPool.QueueUserWorkItem(AsyncReceive);
}
}
try
{
_handle.BeginReceive(_readBuffer, 0, _readBuffer.Length, SocketFlags.None, AsyncReceive, null);
}
catch (ObjectDisposedException)
{
}
catch (Exception ex)
{
OnClientFail(ex);
}
}
private void AsyncReceive(object state)
{
while (true)
{
byte[] readBuffer;
lock (_readBuffers)
{
if (_readBuffers.Count == 0)
{
lock (_readingPacketsLock)
{
_readingPackets = false;
}
return;
}
readBuffer = _readBuffers.Dequeue();
}
_readableDataLen += readBuffer.Length;
bool process = true;
while (process)
{
switch (_receiveState)
{
case ReceiveType.Header:
{
if (_readableDataLen + _tempHeaderOffset >= HEADER_SIZE)
{ // we can read the header
int headerLength = (_appendHeader)
? HEADER_SIZE - _tempHeaderOffset
: HEADER_SIZE;
try
{
if (_appendHeader)
{
try
{
Array.Copy(readBuffer, _readOffset, _tempHeader, _tempHeaderOffset,
headerLength);
}
catch (Exception ex)
{
process = false;
OnClientFail(ex);
break;
}
_payloadLen = BitConverter.ToInt32(_tempHeader, 0);
_tempHeaderOffset = 0;
_appendHeader = false;
}
else
{
_payloadLen = BitConverter.ToInt32(readBuffer, _readOffset);
}
if (_payloadLen <= 0 || _payloadLen > MAX_PACKET_SIZE)
throw new Exception("invalid header");
}
catch (Exception)
{
process = false;
Disconnect();
break;
}
_readableDataLen -= headerLength;
_readOffset += headerLength;
_receiveState = ReceiveType.Payload;
}
else // _readableDataLen < HEADER_SIZE
{
try
{
Array.Copy(readBuffer, _readOffset, _tempHeader, _tempHeaderOffset, _readableDataLen);
}
catch (Exception ex)
{
process = false;
OnClientFail(ex);
break;
}
_tempHeaderOffset += _readableDataLen;
_appendHeader = true;
process = false;
}
break;
}
case ReceiveType.Payload:
{
if (_payloadBuffer == null || _payloadBuffer.Length != _payloadLen)
_payloadBuffer = new byte[_payloadLen];
int length = (_writeOffset + _readableDataLen >= _payloadLen)
? _payloadLen - _writeOffset
: _readableDataLen;
try
{
Array.Copy(readBuffer, _readOffset, _payloadBuffer, _writeOffset, length);
}
catch (Exception ex)
{
process = false;
OnClientFail(ex);
break;
}
_writeOffset += length;
_readOffset += length;
_readableDataLen -= length;
if (_writeOffset == _payloadLen)
{
bool isError = _payloadBuffer.Length == 0;
if (!isError)
{
if (encryptionEnabled)
_payloadBuffer = AES.Decrypt(_payloadBuffer);
isError = _payloadBuffer.Length == 0; // check if payload decryption failed
}
if (!isError)
{
if (compressionEnabled)
{
try
{
_payloadBuffer = SafeQuickLZ.Decompress(_payloadBuffer);
}
catch (Exception)
{
process = false;
Disconnect();
break;
}
}
isError = _payloadBuffer.Length == 0; // check if payload decompression failed
}
if (isError)
{
process = false;
Disconnect();
break;
}
using (MemoryStream deserialized = new MemoryStream(_payloadBuffer))
{
try
{
IPacket packet = (IPacket)Serializer.Deserialize(deserialized);
OnClientRead(packet);
}
catch (Exception ex)
{
process = false;
OnClientFail(ex);
break;
}
}
_receiveState = ReceiveType.Header;
_payloadBuffer = null;
_payloadLen = 0;
_writeOffset = 0;
}
if (_readableDataLen == 0)
process = false;
break;
}
}
}
if (_receiveState == ReceiveType.Header)
{
_writeOffset = 0; // prepare for next packet
}
_readOffset = 0;
_readableDataLen = 0;
}
}
/// <summary>
/// Sends a packet to the connected server.
/// </summary>
/// <typeparam name="T">The type of the packet.</typeparam>
/// <param name="packet">The packet to be send.</param>
public void Send<T>(T packet) where T : IPacket
{
if (!Connected || packet == null) return;
lock (_sendBuffers)
{
using (MemoryStream ms = new MemoryStream())
{
try
{
Serializer.Serialize(ms, packet);
}
catch (Exception ex)
{
OnClientFail(ex);
return;
}
byte[] payload = ms.ToArray();
_sendBuffers.Enqueue(payload);
OnClientWrite(packet, payload.LongLength, payload);
lock (_sendingPacketsLock)
{
if (_sendingPackets) return;
_sendingPackets = true;
}
ThreadPool.QueueUserWorkItem(Send);
}
}
}
/// <summary>
/// Sends a packet to the connected server.
/// Blocks the thread until all packets have been sent.
/// </summary>
/// <typeparam name="T">The type of the packet.</typeparam>
/// <param name="packet">The packet to be send.</param>
public void SendBlocking<T>(T packet) where T : IPacket
{
Send(packet);
while (_sendingPackets)
{
Thread.Sleep(10);
}
}
private void Send(object state)
{
while (true)
{
if (!Connected)
{
SendCleanup(true);
return;
}
byte[] payload;
lock (_sendBuffers)
{
if (_sendBuffers.Count == 0)
{
SendCleanup();
return;
}
payload = _sendBuffers.Dequeue();
}
try
{
_handle.Send(BuildPacket(payload));
}
catch (Exception ex)
{
OnClientFail(ex);
SendCleanup(true);
return;
}
}
}
private byte[] BuildPacket(byte[] payload)
{
if (compressionEnabled)
payload = SafeQuickLZ.Compress(payload);
if (encryptionEnabled)
payload = AES.Encrypt(payload);
byte[] packet = new byte[payload.Length + HEADER_SIZE];
Array.Copy(BitConverter.GetBytes(payload.Length), packet, HEADER_SIZE);
Array.Copy(payload, 0, packet, HEADER_SIZE, payload.Length);
return packet;
}
private void SendCleanup(bool clear = false)
{
lock (_sendingPacketsLock)
{
_sendingPackets = false;
}
if (!clear) return;
lock (_sendBuffers)
{
_sendBuffers.Clear();
}
}
/// <summary>
/// Disconnect the client from the server, disconnect all proxies that
/// are held by this client, and dispose of other resources associated
/// with this client.
/// </summary>
public void Disconnect()
{
if (_handle != null)
{
_handle.Close();
_handle = null;
_readOffset = 0;
_writeOffset = 0;
_tempHeaderOffset = 0;
_readableDataLen = 0;
_payloadLen = 0;
_payloadBuffer = null;
_receiveState = ReceiveType.Header;
if (_proxyClients != null)
{
lock (_proxyClientsLock)
{
try
{
foreach (ReverseProxyClient proxy in _proxyClients)
proxy.Disconnect();
}
catch (Exception)
{
}
}
}
if (Commands.CommandHandler.StreamCodec != null)
{
Commands.CommandHandler.StreamCodec.Dispose();
Commands.CommandHandler.StreamCodec = null;
}
}
OnClientState(false);
}
public void ConnectReverseProxy(ReverseProxyConnect command)
{
lock (_proxyClientsLock)
{
_proxyClients.Add(new ReverseProxyClient(command, this));
}
}
public ReverseProxyClient GetReverseProxyByConnectionId(int connectionId)
{
lock (_proxyClientsLock)
{
return _proxyClients.FirstOrDefault(t => t.ConnectionId == connectionId);
}
}
public void RemoveProxyClient(int connectionId)
{
try
{
lock (_proxyClientsLock)
{
for (int i = 0; i < _proxyClients.Count; i++)
{
if (_proxyClients[i].ConnectionId == connectionId)
{
_proxyClients.RemoveAt(i);
break;
}
}
}
}
catch { }
}
}
visual studio的输出：
Exception thrown: 'System.Net.Sockets.SocketException' in System.dll
Client Fail - Exception Message: No connection could be made because the target machine actively refused it 127.0.0.1:4782
Exception thrown: 'System.NullReferenceException' in Client.exe
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.NullReferenceException' in Client.exe
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.NullReferenceException' in Client.exe
Client Fail - Exception Message: Object reference not set to an instance of an object.
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.NullReferenceException' in Client.exe
Exception thrown: 'System.NullReferenceException' in Client.exe
垃圾是因为服务器没有运行，当我启动服务器并连接crsahing循环开始
提前致谢
答案 0 :(得分：0)
发现错误，客户端上的连接线程在代码中有一个空的ipadress字符串，并且它使用的主机名不存在，我应该在所有代码中看起来更好。感谢