TriggeredConnectionStateChangedEventArgs Class

Reference

Definition

Namespace:: Windows.Networking.Proximity

Important

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Edit

Contains properties that the TriggeredConnectionStateChanged event passes to an application.

public ref class TriggeredConnectionStateChangedEventArgs sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
class TriggeredConnectionStateChangedEventArgs final

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
public sealed class TriggeredConnectionStateChangedEventArgs

Public NotInheritable Class TriggeredConnectionStateChangedEventArgs

Inheritance: Object Platform::Object IInspectable TriggeredConnectionStateChangedEventArgs

Attributes: ContractVersionAttribute MarshalingBehaviorAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0 - for Xbox, see UWP features that aren't yet supported on Xbox)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)
App capabilities	ID_CAP_PROXIMITY [Windows Phone] proximity ID_CAP_PROXIMITY [Windows Phone]

Examples

// Click event for "Start" button.

private void StartFindingPeersButton_Click(object sender, RoutedEventArgs e)
{
    if ((Windows.Networking.Proximity.PeerFinder.SupportedDiscoveryTypes &
         Windows.Networking.Proximity.PeerDiscoveryTypes.Triggered) ==
         Windows.Networking.Proximity.PeerDiscoveryTypes.Triggered)
    {
        Windows.Networking.Proximity.PeerFinder.Start();

        Windows.Networking.Proximity.PeerFinder.TriggeredConnectionStateChanged += 
            TriggeredConnectionStateChanged;

        WriteMessageText("Waiting for peers. Enter proximity to connect. " +
            "Call PeerFinder.start() on the peer to send and receive messages.\n");
    }
    else {
        WriteMessageText("Peer discovery using tapping is not supported.\n");
    }
}

private void TriggeredConnectionStateChanged(object sender,
    Windows.Networking.Proximity.TriggeredConnectionStateChangedEventArgs e)
{
    if (e.State == Windows.Networking.Proximity.TriggeredConnectState.Completed)
    {
        WriteMessageText("Connected. You may now send a message.\n");
        SendMessage(e.Socket);
    }
}

Windows.Networking.Sockets.StreamSocket proximitySocket;
Windows.Storage.Streams.DataWriter dataWriter;

// Reference socket streams for writing and reading messages.
private void SendMessage(Windows.Networking.Sockets.StreamSocket socket) {
    // Get the network socket from the proximity connection.
    proximitySocket = socket;

    // Create DataWriter for writing messages to peers.
    dataWriter = new Windows.Storage.Streams.DataWriter(proximitySocket.OutputStream);

    // Listen for messages from peers.
    Windows.Storage.Streams.DataReader dataReader = 
            new Windows.Storage.Streams.DataReader(proximitySocket.InputStream);
    StartReader(proximitySocket, dataReader);
}

// Send a message to the socket.
private async void SendMessageText() {
    string msg = SendMessageTextBlock.Text;

    if (msg.Length > 0) {
        var msgLength = dataWriter.MeasureString(msg);
        dataWriter.WriteInt32(msg.Length);
        dataWriter.WriteString(msg);
        try
        {
            await dataWriter.StoreAsync();
            WriteMessageText("Message sent: " + msg  + "\n");
        }
        catch (Exception e)
        {
            WriteMessageText("Send error: " + e.Message + "\n");
        }
    }
}

// Read out and print the message received from the socket.
private async void StartReader(
    Windows.Networking.Sockets.StreamSocket socket, 
    Windows.Storage.Streams.DataReader reader)
{
    uint initialLength = 4;

    try
    {
        await reader.LoadAsync(initialLength);
        uint msgLength = (uint)reader.ReadInt32();

        try
        {
            await reader.LoadAsync(msgLength);
            string message = reader.ReadString(msgLength);
            WriteMessageText("Received message: " + message + "\n");

            // After receiving a message, listen for the next message.
            StartReader(socket, reader);
        }
        catch (Exception e)
        {
            WriteMessageText("Error: " + e.Message + "\n");
            socket.Dispose();
        }
    }
    catch (Exception e)
    {
        WriteMessageText("Error: " + e.Message + "\n");
        socket.Dispose();
    }
}

// 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;
        });
}

' Click event for "Start" button.

Private Sub StartFindingPeersButton_Click(sender As Object, e As RoutedEventArgs)

    If ((Windows.Networking.Proximity.PeerFinder.SupportedDiscoveryTypes &
         Windows.Networking.Proximity.PeerDiscoveryTypes.Triggered) =
         Windows.Networking.Proximity.PeerDiscoveryTypes.Triggered) Then

        Windows.Networking.Proximity.PeerFinder.Start()

        AddHandler Windows.Networking.Proximity.PeerFinder.TriggeredConnectionStateChanged,
            AddressOf TriggeredConnectionStateChanged

        WriteMessageText("Waiting for peers. Enter proximity to connect. " &
            "Call PeerFinder.start() on the peer to send and receive messages." & vbTab)
    Else
        WriteMessageText("Peer discovery using tapping is not supported." & vbTab)
    End If
End Sub

Private Sub TriggeredConnectionStateChanged(sender As Object,
    e As Windows.Networking.Proximity.TriggeredConnectionStateChangedEventArgs)

    If e.State = Windows.Networking.Proximity.TriggeredConnectState.Completed Then
        WriteMessageText("Connected. You may now send a message." & vbTab)
        SendMessage(e.Socket)
    End If
End Sub

Private proximitySocket As Windows.Networking.Sockets.StreamSocket
Private dataWriter As Windows.Storage.Streams.DataWriter

' Reference socket streams for writing and reading messages.
Private Sub SendMessage(socket As Windows.Networking.Sockets.StreamSocket)
    ' Get the network socket from the proximity connection.
    proximitySocket = socket

    ' Create DataWriter for writing messages to peers.
    dataWriter = New Windows.Storage.Streams.DataWriter(proximitySocket.OutputStream)

    ' Listen for messages from peers.
    Dim dataReader = New Windows.Storage.Streams.DataReader(proximitySocket.InputStream)
    StartReader(proximitySocket, dataReader)
End Sub

' Send a message to the socket.
Private Async Sub SendMessageText()
    Dim msg = SendMessageTextBlock.Text

    If msg.Length > 0 Then
        Dim msgLength = dataWriter.MeasureString(msg)
        dataWriter.WriteInt32(msg.Length)
        dataWriter.WriteString(msg)
        Try
            Await dataWriter.StoreAsync()
            WriteMessageText("Message sent: " & msg & vbTab)
        Catch e As Exception
            WriteMessageText("Send error: " & e.Message & vbTab)
        End Try
    End If
End Sub

' Read out and print the message received from the socket.
Private Async Sub StartReader(
    socket As Windows.Networking.Sockets.StreamSocket,
    reader As Windows.Storage.Streams.DataReader)

    Dim initialLength As UInteger = 4

    Try
        Await reader.LoadAsync(initialLength)
        Dim msgLength = CType(reader.ReadInt32(), UInteger)

        Try
            Await reader.LoadAsync(msgLength)
            Dim message = reader.ReadString(msgLength)
            WriteMessageText("Received message: " & message & vbTab)

            ' After receiving a message, listen for the next message.
            StartReader(socket, reader)
        Catch e As Exception
            WriteMessageText("Error: " & e.Message & vbTab)
            socket.Dispose()
        End Try
    Catch e As Exception
        WriteMessageText("Error: " & e.Message & vbTab)
        socket.Dispose()
    End Try
End Sub

' Write a message to MessageBlock on the UI thread.
Private Async Sub WriteMessageText(message As String, Optional overwrite As Boolean = False)
    Await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        Sub()
            If overwrite Then
                MessageBlock.Text = message
            Else
                MessageBlock.Text &= message
            End If
        End Sub)
End Sub

Properties

Id	Gets the unique identifier for the connection in progress.
Socket	Gets the StreamSocket instance for the connection.
State	Gets the state of the connection in progress.

Applies to

Delen via

TriggeredConnectionStateChangedEventArgs Class

Definition

Windows requirements

Examples

Properties

Applies to

See also

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