// 受信したメッセージをエコーバックする
private async void EchoMessage(RemotePeer peer, DatagramSocketMessageReceivedEventArgs args)
{
if (!peer.IsMatching(args.RemoteAddress, args.RemotePort))
{
NotifyUserFromAsyncThread(
string.Format(
"Got datagram from {0}:{1}, but already 'connected' to {2}",
args.RemoteAddress,
args.RemotePort,
peer),
NotifyType.ErrorMessage);
}
try
{
await peer.OutputStream.WriteAsync(args.GetDataReader().DetachBuffer());
}
catch (Exception exception)
{
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
NotifyUserFromAsyncThread("Send failed with error: " + exception.Message, NotifyType.ErrorMessage);
}
}
// Listenerがメッセージを受信したときのハンドラ
private async void MessageReceivedAsync(Windows.Networking.Sockets.DatagramSocket socket, DatagramSocketMessageReceivedEventArgs args)
{
if (CoreApplication.Properties.TryGetValue("remotePeer", out var outObj))
{
EchoMessage((RemotePeer)outObj, args);
return;
}
try
{
// SenderのアドレスとポートからOutputStreamを取得
var outputStream = await socket.GetOutputStreamAsync(
args.RemoteAddress,
args.RemotePort);
RemotePeer peer;
lock (this)
{
if (CoreApplication.Properties.TryGetValue("remotePeer", out outObj))
{
peer = (RemotePeer)outObj;
}
else
{
peer = new RemotePeer(outputStream, args.RemoteAddress, args.RemotePort);
CoreApplication.Properties.Add("remotePeer", peer);
}
}
EchoMessage(peer, args);
}
catch (Exception exception)
{
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
NotifyUserFromAsyncThread("Connect failed with error: " + exception.Message, NotifyType.ErrorMessage);
}
}
