// Exchange a message with the host.
internal void Send(byte[] sendBuffer)
{
if (connected)
{
//先对数据进行包装,就是把包的大小作为头加入
byte[] buff = new byte[sendBuffer.Length + 4];
Array.Copy(BitConverter.GetBytes(Overall.CryString.Length), buff, 4);
Array.Copy(sendBuffer, 0, buff, 4, sendBuffer.Length);
//查找有没有空闲的发送MySocketEventArgs
MySocketEventArgs sendArgs = listArgs.Find(a => a.IsUsing == false);
if (sendArgs == null)
{
sendArgs = initSendArgs();
}
lock (sendArgs) //要锁定,
{
sendArgs.IsUsing = true;
sendArgs.SetBuffer(buff, 0, buff.Length);
}
clientSocket.SendAsync(sendArgs);
}
else
{
throw new SocketException((Int32)SocketError.NotConnected);
}
}
/// <summary>
/// 初始化发送参数MySocketEventArgs
/// </summary>
/// <returns></returns>
MySocketEventArgs initSendArgs()
{
MySocketEventArgs sendArg = new MySocketEventArgs();
sendArg.Completed += new EventHandler <SocketAsyncEventArgs>(IO_Completed);
sendArg.UserToken = clientSocket;
sendArg.RemoteEndPoint = hostEndPoint;
sendArg.IsUsing = false;
Interlocked.Increment(ref tagCount);
sendArg.ArgsTag = tagCount;
lock (listArgs)
{
listArgs.Add(sendArg);
}
return(sendArg);
}
void IO_Completed(object sender, SocketAsyncEventArgs e)
{
MySocketEventArgs mys = (MySocketEventArgs)e;
// determine which type of operation just completed and call the associated handler
switch (e.LastOperation)
{
case SocketAsyncOperation.Receive:
ProcessReceive(e);
break;
case SocketAsyncOperation.Send:
mys.IsUsing = false; //数据发送已完成.状态设为False
ProcessSend(e);
break;
default:
throw new ArgumentException("The last operation completed on the socket was not a receive or send");
}
}