PeerFinder.DiscoveryData Property

Reference

Definition

Namespace:: Windows.Networking.Proximity

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Edit

Gets or sets user or device data to include during device discovery.

public:
 static property IBuffer ^ DiscoveryData { IBuffer ^ get(); void set(IBuffer ^ value); };

static IBuffer DiscoveryData();

static void DiscoveryData(IBuffer value);

public static IBuffer DiscoveryData { get; set; }

var iBuffer = PeerFinder.discoveryData;
PeerFinder.discoveryData = iBuffer;

Public Shared Property DiscoveryData As IBuffer

Property Value

IBuffer

User or device data to include during device discovery. Must be less than 32 bytes.

Windows requirements

App capabilities

proximity

Examples

// Default to the peer role.
Windows.Networking.Proximity.PeerRole appRole = Windows.Networking.Proximity.PeerRole.Peer;
bool launchedByTap = false;

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    LaunchActivatedEventArgs launchArgs = e.Parameter as LaunchActivatedEventArgs;

    if (launchArgs.Arguments.Contains("Windows.Networking.Proximity.PeerFinder:StreamSocket"))
    {
        launchedByTap = true;

        if (launchArgs.Arguments.Contains("Role=Host"))
        {
            appRole = Windows.Networking.Proximity.PeerRole.Host;
        }
        else if (launchArgs.Arguments.Contains("Role=Client"))
        {
            appRole = Windows.Networking.Proximity.PeerRole.Client;
        }
        else
        {
            appRole = Windows.Networking.Proximity.PeerRole.Peer;
        }
    }
}

bool started = false;

// Click event for "Advertise" button.
void AdvertiseForPeers(object sender, RoutedEventArgs e)
{
    if (!started)
    {
        Windows.Networking.Proximity.PeerFinder.DisplayName = DisplayNameTextBox.Text;

        if ((Windows.Networking.Proximity.PeerFinder.SupportedDiscoveryTypes &
             Windows.Networking.Proximity.PeerDiscoveryTypes.Triggered) ==
             Windows.Networking.Proximity.PeerDiscoveryTypes.Triggered)
        {
            Windows.Networking.Proximity.PeerFinder.TriggeredConnectionStateChanged +=
                TriggeredConnectionStateChanged;

            WriteMessageText("You can tap to connect a peer device that is " +
                             "also advertising for a connection.\n");
        }
        else
        {
            WriteMessageText("Tap to connect is not supported.\n");
        }

        if ((Windows.Networking.Proximity.PeerFinder.SupportedDiscoveryTypes &
             Windows.Networking.Proximity.PeerDiscoveryTypes.Browse) !=
             Windows.Networking.Proximity.PeerDiscoveryTypes.Browse)
        {
            WriteMessageText("Peer discovery using Wi-Fi Direct is not supported.\n");
        }

        // Set the peer role selected by the user.  
        if (launchedByTap)
        {
            Windows.Networking.Proximity.PeerFinder.Role = appRole;
        }
        else
        {
            switch (GetRoleFromUser())
            {
                case "Peer":
                    Windows.Networking.Proximity.PeerFinder.Role =
                        Windows.Networking.Proximity.PeerRole.Peer;
                    break;
                case "Host":
                    Windows.Networking.Proximity.PeerFinder.Role =
                        Windows.Networking.Proximity.PeerRole.Host;
                    break;
                case "Client":
                    Windows.Networking.Proximity.PeerFinder.Role =
                        Windows.Networking.Proximity.PeerRole.Client;
                    break;
            }
        }

        // Set discoveryData property with user supplied text. 
        var discData = GetDiscoveryDataFromUser();
        var writer = new Windows.Storage.Streams.DataWriter(
            new Windows.Storage.Streams.InMemoryRandomAccessStream());
        writer.WriteString(discData);
        Windows.Networking.Proximity.PeerFinder.DiscoveryData =
            writer.DetachBuffer();

        Windows.Networking.Proximity.PeerFinder.Start();
        started = true;
    }
}

// Write a message to MessageBlock on the UI thread.
private Windows.UI.Core.CoreDispatcher messageDispatcher = Window.Current.CoreWindow.Dispatcher;
async private void WriteMessageText(string message, bool overwrite = false)
{
    await messageDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () =>
        {
            if (overwrite)
                MessageBlock.Text = message;
            else
                MessageBlock.Text += message;
        });
}

Remarks

Windows Phone 8.x app: This property is not supported. Setting it has no effect and no data is returned from this property on a phone.

Applies to

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