private void PopulateAdapterList()
{
localHostItems.Clear();
AdapterList.ItemsSource = localHostItems;
AdapterList.DisplayMemberPath = "DisplayString";
foreach (HostName localHostInfo in NetworkInformation.GetHostNames())
{
if (localHostInfo.IPInformation != null)
{
LocalHostItem adapterItem = new LocalHostItem(localHostInfo);
localHostItems.Add(adapterItem);
}
}
}
private async void StartListener_Click(object sender, RoutedEventArgs e)
{
// Overriding the listener here is safe as it will be deleted once all references to it are gone.
// However, in many cases this is a dangerous pattern to override data semi-randomly (each time user
// clicked the button) so we block it here.
if (CoreApplication.Properties.ContainsKey("listener"))
{
rootPage.NotifyUser(
"This step has already been executed. Please move to the next one.",
NotifyType.ErrorMessage);
return;
}
if (String.IsNullOrEmpty(ServiceNameForListener.Text))
{
rootPage.NotifyUser("Please provide a service name.", NotifyType.ErrorMessage);
return;
}
CoreApplication.Properties.Remove("serverAddress");
CoreApplication.Properties.Remove("adapter");
LocalHostItem selectedLocalHost = null;
selectedLocalHost = (LocalHostItem)AdapterList.SelectedItem;
if (selectedLocalHost == null)
{
rootPage.NotifyUser("Please select an address / adapter.", NotifyType.ErrorMessage);
return;
}
// The user selected an address. For demo purposes, we ensure that connect will be using the same
// address.
CoreApplication.Properties.Add("serverAddress", selectedLocalHost.LocalHost.CanonicalName);
StreamSocketListener listener = new StreamSocketListener();
listener.ConnectionReceived += OnConnection;
// If necessary, tweak the listener's control options before carrying out the bind operation.
// These options will be automatically applied to the connected StreamSockets resulting from
// incoming connections (i.e., those passed as arguments to the ConnectionReceived event handler).
// Refer to the StreamSocketListenerControl class' MSDN documentation for the full list of control options.
listener.Control.KeepAlive = false;
// Save the socket, so subsequent steps can use it.
CoreApplication.Properties.Add("listener", listener);
// Start listen operation.
try
{
// Try to bind to a specific address.
await listener.BindEndpointAsync(selectedLocalHost.LocalHost, ServiceNameForListener.Text);
rootPage.NotifyUser(
"Listening on address " + selectedLocalHost.LocalHost.CanonicalName,
NotifyType.StatusMessage);
}
catch (Exception exception)
{
CoreApplication.Properties.Remove("listener");
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
rootPage.NotifyUser(
"Start listening failed with error: " + exception.Message,
NotifyType.ErrorMessage);
}
}
