/// <summary>
///數據接收處理函數
/// </summary>
/// <param name="iar">異步Socket</param>
protected virtual void RecvData(IAsyncResult iar)
{
Socket remote = (Socket)iar.AsyncState;
try
{
String receivedData = String.Empty;
int recv = remote.EndReceive(iar);
//正常的退出
if (recv == 0)
{
_session.TypeOfExit = Session.ExitType.NormalExit;
if (DisConnectedServer != null)
{
DisConnectedServer(this, new NetEventArgs(_session));
}
return;
}
if (HeadLength)
{
byte[] Bytes = new byte[_recvDataBuffer.Length - 4];
Array.Copy(_recvDataBuffer, 4, Bytes, 0, _recvDataBuffer.Length - 4);
receivedData = _coder.GetEncodingString(Bytes, recv);
}
else
{
receivedData = _coder.GetEncodingString(_recvDataBuffer, recv);
}
//通過事件發布收到的報文
if (ReceivedDatagram != null)
{
//通過報文解析器分析出報文
//如果定義了報文的尾標記，需要處理報文的多種情況
if (_resolver != null)
{
if (_session.Datagram != null &&
_session.Datagram.Length != 0)
{
//加上最後一次通訊剩餘的報文片斷
receivedData = _session.Datagram + receivedData;
}
string[] recvDatagrams = _resolver.Resolve(ref receivedData);
foreach (string newDatagram in recvDatagrams)
{
//因為需要保證多個不同報文獨立存在
ICloneable copySession = (ICloneable)_session;
Session clientSession = (Session)copySession.Clone();
clientSession.Datagram = newDatagram;
//發布一個報文消息
ReceivedDatagram(this, new NetEventArgs(clientSession));
}
//剩餘的代碼片斷，下次接收的時候使用
_session.Datagram = receivedData;
}
//沒有定義報文的尾標記，直接交給消息訂閱者使用
else
{
ICloneable copySession = (ICloneable)_session;
Session clientSession = (Session)copySession.Clone();
clientSession.Datagram = receivedData;
ReceivedDatagram(this, new NetEventArgs(clientSession));
}
}//end of if(ReceivedDatagram != null)
//繼續接收數據
_session.ClientSocket.BeginReceive(_recvDataBuffer, 0, DefaultBufferSize, SocketFlags.None,
new AsyncCallback(RecvData), _session.ClientSocket);
}
catch (SocketException ex)
{
//客戶端退出
if (10054 == ex.ErrorCode)
{
//服務器強制的關閉連接，強制退出
_session.TypeOfExit = Session.ExitType.ExceptionExit;
if (DisConnectedServer != null)
{
DisConnectedServer(this, new NetEventArgs(_session));
}
}
else
{
throw (ex);
}
}
catch (ObjectDisposedException ex)
{
//這裡的實現不夠優雅
//當調用CloseSession（）時，會結束數據接收，但是數據接收
//處理中會調用int recv = client.EndReceive（iar）;
//就訪問了CloseSession（）已經處置的對象
//我想這樣的實現方法也是無傷大雅的。
if (ex != null)
{
ex = null;
//DoNothing;
}
}
}
/// <summary>
/// 接受数据完成处理函数，异步的特性就体现在这个函数中，
/// 收到数据后，会自动解析为字符串报文
/// </summary>
/// <param name="iar">目标客户端Socket</param>
protected virtual void ReceiveData(IAsyncResult iar)
{
Socket client = (Socket)iar.AsyncState;
try
{
//如果两次开始了异步的接收,所以当客户端退出的时候
//会两次执行EndReceive
string receivedData = String.Empty;
int recv = client.EndReceive(iar);
if (recv == 0)
{
//正常的关闭
CloseClient(client, Session.ExitType.NormalExit);
return;
}
if (HeadLength)
{
byte[] Bytes = new byte[_recvDataBuffer.Length - 4];
Array.Copy(_recvDataBuffer, 4, Bytes, 0, _recvDataBuffer.Length - 4);
receivedData = _coder.GetEncodingString(Bytes, recv);
}
else
{
receivedData = _coder.GetEncodingString(_recvDataBuffer, recv);
}
//发布收到数据的事件
if (RecvData != null)
{
Session sendDataSession = FindSession(client);
Debug.Assert(sendDataSession != null);
//如果定义了报文的尾标记,需要处理报文的多种情况
if (_resolver != null)
{
if (sendDataSession.Datagram != null &&
sendDataSession.Datagram.Length != 0)
{
//加上最后一次通讯剩余的报文片断
receivedData = sendDataSession.Datagram + receivedData;
}
string[] recvDatagrams = _resolver.Resolve(ref receivedData);
foreach (string newDatagram in recvDatagrams)
{
//深拷贝,为了保持Datagram的对立性
ICloneable copySession = (ICloneable)sendDataSession;
Session clientSession = (Session)copySession.Clone();
clientSession.Datagram = newDatagram;
//发布一个报文消息
RecvData(this, new NetEventArgs(clientSession));
}
//剩余的代码片断,下次接收的时候使用
sendDataSession.Datagram = receivedData;
if (sendDataSession.Datagram.Length > MaxDatagramSize)
{
sendDataSession.Datagram = null;
}
}
//没有定义报文的尾标记,直接交给消息订阅者使用
else
{
ICloneable copySession = (ICloneable)sendDataSession;
Session clientSession = (Session)copySession.Clone();
clientSession.Datagram = receivedData;
RecvData(this, new NetEventArgs(clientSession));
}
}//end of if(RecvData!=null)
//继续接收来自来客户端的数据
client.BeginReceive(_recvDataBuffer, 0, _recvDataBuffer.Length, SocketFlags.None,
new AsyncCallback(ReceiveData), client);
}
catch (SocketException ex)
{
//客户端退出
if (10054 == ex.ErrorCode)
{
//客户端强制关闭
CloseClient(client, Session.ExitType.ExceptionExit);
}
}
catch (ObjectDisposedException ex)
{
//这里的实现不够优雅
//当调用CloseSession()时,会结束数据接收,但是数据接收
//处理中会调用int recv = client.EndReceive(iar);
//就访问了CloseSession()已经处置的对象
//我想这样的实现方法也是无伤大雅的.
if (ex != null)
{
ex = null;
//DoNothing;
}
}
}