//stream异步结束写入
private void EndWrite(IAsyncResult ar)
{
SocketHandlerState state = (SocketHandlerState)ar.AsyncState;
//锁定StateSet
lock (StateSet)
StateSet.Add(state.AsyncResult, state);
try
{
state.Stream.EndWrite(ar);
}
catch
{
//出现Socket异常，发送失败
state.Completed = false;
//允许等待线程继续
((AutoResetEvent)state.AsyncResult.AsyncWaitHandle).Set();
//执行异步回调函数
state.AsyncCallBack(state.AsyncResult);
return;
}
//发送成功
state.Completed = true;
//允许等待线程继续
((AutoResetEvent)state.AsyncResult.AsyncWaitHandle).Set();
//执行异步回调函数
state.AsyncCallBack(state.AsyncResult);
//锁定SendQueue
lock (SendQueue)
{
SocketHandlerState prepare = null;
//移除当前发送完成的数据
SendQueue.Remove(state);
//如果SendQueue还有数据存在，则继续发送
if (SendQueue.Count > 0)
{
prepare = SendQueue[0];
}
if (prepare != null)
{
//获取数据长度
//ushort的最大值为65535
//转换为byte[]长度为2
var dataLength = BitConverter.GetBytes((ushort)prepare.Data.Length);
//向对方发送长度为2的头信息，表示接下来要发送的数据长度
prepare.Stream.Write(dataLength, 0, dataLength.Length);
//开始异步发送数据
prepare.Stream.BeginWrite(prepare.Data, 0, prepare.Data.Length, EndWrite, prepare).AsyncWaitHandle.WaitOne();
}
}
}
//stream异步结束读取
private void EndRead(IAsyncResult ar)
{
SocketHandlerState state = (SocketHandlerState)ar.AsyncState;
int dataLength;
try
{
dataLength = state.Stream.EndRead(ar);
}
catch
{
dataLength = 0;
}
//dataLength为0则表示Socket断开连接
if (dataLength == 0)
{
lock (StateSet)
StateSet.Add(state.AsyncResult, state);
//设定接收到的数据位空byte数组
state.Data = new byte[0];
//允许等待线程继续
((AutoResetEvent)state.AsyncResult.AsyncWaitHandle).Set();
//执行异步回调函数
state.AsyncCallBack(state.AsyncResult);
return;
}
//如果是已完成状态，则表示state.Data的数据是头信息
if (state.Completed)
{
//设定状态为未完成
state.Completed = false;
//已接收得数据长度为0
state.DataLength = 0;
//获取主要数据长度
var length = BitConverter.ToUInt16(state.Data, 0);
//初始化数据的byte数组
state.Data = new byte[length];
try
{
//开始异步接收主要数据
state.Stream.BeginRead(state.Data, 0, length, EndRead, state);
}
catch
{
//出现Socket异常
lock (StateSet)
StateSet.Add(state.AsyncResult, state);
state.Data = new byte[0];
((AutoResetEvent)state.AsyncResult.AsyncWaitHandle).Set();
state.AsyncCallBack(state.AsyncResult);
}
return;
}
//接收到主要数据
else
{
//判断是否接收了完整的数据
if (dataLength + state.DataLength != state.Data.Length)
{
//增加已接收数据长度
state.DataLength += dataLength;
try
{
//继续接收数据
state.Stream.BeginRead(state.Data, state.DataLength, state.Data.Length - state.DataLength, EndRead, state);
}
catch
{
//出现Socket异常
lock (StateSet)
StateSet.Add(state.AsyncResult, state);
state.Data = new byte[0];
((AutoResetEvent)state.AsyncResult.AsyncWaitHandle).Set();
state.AsyncCallBack(state.AsyncResult);
return;
}
return;
}
//接收完成
state.Completed = true;
lock (StateSet)
StateSet.Add(state.AsyncResult, state);
((AutoResetEvent)state.AsyncResult.AsyncWaitHandle).Set();
state.AsyncCallBack(state.AsyncResult);
}
}
