/// <summary>
/// 连接服务器
/// </summary>
/// <param name="ip">IP地址</param>
/// <param name="port">端口号</param>
/// <param name="state">异步状态对象</param>
/// <returns></returns>
public bool ConnectServer(string ip, int port, StateObject state)
{
try
{
if (_socketAsyncEventArgs != null)
{
_socketAsyncEventArgs.Completed -= OnSocketAsyncCompleted;
_socketAsyncEventArgs.Dispose();
_socketAsyncEventArgs = null;
}
//连接 服务端监听套接字
if (_socketAsyncEventArgs == null)
{
_socketAsyncEventArgs = GetISocketAsyncEventArgs();
}
_socketAsyncEventArgs.SocketProtocol = SocketProtocol.Tcp;
_socketAsyncEventArgs.Completed -= OnSocketAsyncCompleted;
_socketAsyncEventArgs.Completed += OnSocketAsyncCompleted;
_socketAsyncEventArgs.UserToken = state;
// 包含 ip和port
_socketAsyncEventArgs.RemoteIP = ip;
_socketAsyncEventArgs.RemotePort = port;
//实例化 套接字
_sokClient = GetISocket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
_sokClient.SendBufferSize = 1024 * 10;
_sokClient.ReceiveBufferSize = 1024 * 100;
_sokClient.Ttl = 64;
_socketAsyncEventArgs.CurrentSocket = _sokClient;
return(_sokClient.ConnectAsync(_socketAsyncEventArgs));
}
catch (Exception ex)
{
CloseSocket();
GC.Collect();
return(false);
}
}
/// <summary>
/// 连接完成回调
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void OnSocketAsyncCompleted(object sender, ISocketAsyncEventArgs e)
{
bool stopReceive = false; //是否停止数据接收
StateObject state = e.UserToken as StateObject;
try
{
if (e.SocketError == SocketError.Success)
{
if (e.LastOperation == SocketAsyncOperation.Connect)
{
_connSuccess = true;
ConnectSuccess?.Invoke();
}
else if (e.LastOperation == SocketAsyncOperation.Receive)
{
if (state != null)
{
//服务器发来的消息
int length = e.BytesTransferred;
state.EnqueueBufferQueue(length); //存储接受过来的数据
}
}
}
else if (e.SocketError == SocketError.ConnectionReset)
{
System.Diagnostics.Debug.WriteLine(e.SocketError);
stopReceive = true;
SocketDisconnected?.Invoke();
}
else if (e.SocketError == SocketError.ConnectionAborted || e.SocketError == SocketError.OperationAborted)
{
stopReceive = true;
}
else
{
stopReceive = true;
}
}
catch (Exception ex)
{
if (ex is ObjectDisposedException)
{
stopReceive = true;
return; //停止接收数据
}
}
finally
{
try
{
if (!stopReceive)
{
if (state != null)
{
//继续接收消息
e.SetBuffer(state.Buffer, 0, state.BufferSize);
e.CurrentSocket.ReceiveAsync(e);
}
}
else
{
e.Dispose();
e = null;
state = null;
CloseSocket();
}
}
catch (Exception ex)
{
if (!(ex is ObjectDisposedException))
{
CloseSocket();
GC.Collect();
}
}
}
}
/// <summary>
/// 异步发送数据
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public bool SendAsync(ISocketAsyncEventArgs e)
{
e.CurrentSocket = _sokClient;
return(_sokClient.SendAsync(e));
}
protected virtual void OnCompleted(ISocketAsyncEventArgs e)
{
Completed?.Invoke(e.CurrentSocket, e);
}
/// <summary> /// 开始一个异步请求以便从连接的 <see cref="T:System.Net.Sockets.Socket" /> 对象中接收数据。 /// </summary> /// <param name="e"></param> /// <returns></returns> public abstract bool ReceiveAsync(ISocketAsyncEventArgs e);
/// <summary> /// 开始一个对远程主机连接的异步请求。 /// </summary> /// <param name="e"></param> /// <returns></returns> public abstract bool ConnectAsync(ISocketAsyncEventArgs e);
public abstract bool SendAsync(ISocketAsyncEventArgs e);
