void OnSendCompleted(object sender, SocketAsyncEventArgs e)
{
//如果传输的数据量为0，则表示链接已经断开
if (e.BytesTransferred == 0)
{
Client.Close();
}
else
{
if (DataSend != null)
{
AsyncConnectionEventArgs se = new AsyncConnectionEventArgs(e.Buffer, this);
DataSend(this, se);
}
//通知数据发送完毕
SendResetEvent.Set();
}
}
/// <summary>
/// 接收数据处理函数
/// 1、将收到的数据包中的前4字节转换成Int32类型，作为本次数据包的长度。
/// 2、将这个值设置成StateObject的RemainSize。
/// 3、将数据包中剩下的数据写入StateObject的MemoryStream，并减少相应的RemainSize值。
/// 4、直到RemainSize=0时，表示这一段数据已经接收完毕，从而重复1，开始下一段数据包的接收
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void OnReceiveCompleted(object sender, SocketAsyncEventArgs e)
{
//如果传输的数据量为0，则表示链接已经断开
if (e.BytesTransferred == 0)
{
Client.Close();
}
else
{
int position = 0;
var c = System.Text.Encoding.UTF8.GetString(e.Buffer, 0, e.Buffer.Length);
while (position < e.BytesTransferred)
{
if (State.RemainSize > 0)
{
int bytesToRead = State.RemainSize > e.BytesTransferred - position ?
e.BytesTransferred - position : State.RemainSize;
State.RemainSize -= bytesToRead;
State.Stream.Write(State.Buffer, position, bytesToRead);
position += bytesToRead;
if (State.RemainSize == 0)
{
if (DataRecieved != null)
{
AsyncConnectionEventArgs ce =
new AsyncConnectionEventArgs(State.Stream.ToArray(), this);
DataRecieved(this, ce);
}
State.Stream.Dispose();
}
}
else
{
State.RemainSize = BitConverter.ToInt32(State.Buffer, position);
State.Stream = new MemoryStream(State.RemainSize);
position += 4;
}
}
//重新设置数据缓存区
e.SetBuffer(State.Buffer, 0, State.Buffer.Length);
Client.ReceiveAsync(e);
}
}
