TriggeredConnectionStateChangedEventArgs class

Applies to Windows and Windows Phone

Contains properties that the TriggeredConnectionStateChanged event passes to an application.

Syntax


Public NotInheritable Class TriggeredConnectionStateChangedEventArgs

Attributes

[MarshalingBehavior(Agile)]
[Version(0x06020000)]

Members

The TriggeredConnectionStateChangedEventArgs class has these types of members:

Methods

The TriggeredConnectionStateChangedEventArgs class inherits methods from the Object class (C#/VB/C++).

Properties

The TriggeredConnectionStateChangedEventArgs class has these properties.

PropertyAccess typeDescription

Id

Read-onlyGets the unique identifier for the connection in progress.

Socket

Read-onlyGets the StreamSocket instance for the connection.

State

Read-onlyGets the state of the connection in progress.

 

Examples


' 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


Requirements

Minimum supported client

Windows 8 [Windows Store apps only]

Minimum supported server

Windows Server 2012 [Windows Store apps only]

Minimum supported phone

Windows Phone 8

Namespace

Windows.Networking.Proximity
Windows::Networking::Proximity [C++]

Metadata

Windows.winmd

Capabilities

proximity
ID_CAP_PROXIMITY [Windows Phone]

See also

TriggeredConnectionStateChanged
Proximity and Tapping (JavaScript)
Proximity and Tapping (C#/VB/C++)
Samples
Proximity sample

 

 

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