MessageTransmittedHandler Délégué

Définition

public delegate void MessageTransmittedHandler(ProximityDevice ^ sender, long long messageId);

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Guid(4020898634, 63202, 19837, 133, 108, 120, 252, 142, 252, 2, 30)]
class MessageTransmittedHandler : MulticastDelegate

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Guid(4020898634, 63202, 19837, 133, 108, 120, 252, 142, 252, 2, 30)]
public delegate void MessageTransmittedHandler(ProximityDevice sender, long messageId);

var messageTransmittedHandlerHandler = function(sender, messageId){
/* Your code */
}

Public Delegate Sub MessageTransmittedHandler(sender As ProximityDevice, messageId As Long)

Paramètres

Attributs

ContractVersionAttribute GuidAttribute

Configuration requise pour Windows

Exemples

    Windows.Networking.Proximity.ProximityDevice proximityDevice;
    long publishedMessageId = -1;
    long subscribedMessageId = -1;

    private void initializeProximityDevice()
    {
        proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault();

        if (proximityDevice != null)
        {
            PublishMessageButton.Click += PublishMessage;
            SubscribeForMessageButton.Click += SubscribeForMessage;
            StopSubscribingForMessageButton.Click += StopSubscribingForMessage;
            StopPublishingMessageButton.Click += StopPublishingMessage;
        }
        else
        {
            WriteMessageText("Failed to initialized proximity device.\n");
        }
    }

    private void PublishMessage(object sender, RoutedEventArgs e)
    {
        // Stop publishing the current message.
        if (publishedMessageId != -1)
        {
            proximityDevice.StopPublishingMessage(publishedMessageId);
        }

        publishedMessageId = 
            proximityDevice.PublishMessage("Windows.SampleMessage", MessageTextBlock.Text,
                                                   MessagePublished);
    }

private void MessagePublished(
    Windows.Networking.Proximity.ProximityDevice sender,
        long messageId)
    {
    // The message has been successfully published.
    }

    private void SubscribeForMessage(object sender, RoutedEventArgs e)
    {
        // Only subscribe for the message one time.
        if (subscribedMessageId == -1)
        {
            subscribedMessageId = 
            proximityDevice.SubscribeForMessage("Windows.SampleMessage", messageReceived);
        }
    }

    private void messageReceived(
        Windows.Networking.Proximity.ProximityDevice device, 
        Windows.Networking.Proximity.ProximityMessage message)
    {
        MessageBlock.Text += "Message received: " + message.DataAsString + "\n";
    }

    private void StopSubscribingForMessage(object sender, RoutedEventArgs e)
    {
        proximityDevice.StopSubscribingForMessage(subscribedMessageId);
        subscribedMessageId = -1;
    }

    private void StopPublishingMessage(object sender, RoutedEventArgs e)
    {
        proximityDevice.StopPublishingMessage(publishedMessageId);
        publishedMessageId = -1;
    }

    // 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;
            });
    }

Private proximityDevice As Windows.Networking.Proximity.ProximityDevice
Private publishedMessageId As Long = -1
Private subscribedMessageId As Long = -1

Private Sub initializeProximityDevice()
    proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault()

    If proximityDevice IsNot Nothing Then
        AddHandler PublishMessageButton.Click, AddressOf PublishMessage
        AddHandler SubscribeForMessageButton.Click, AddressOf SubscribeForMessage
        AddHandler StopSubscribingForMessageButton.Click, AddressOf StopSubscribingForMessage
        AddHandler StopPublishingMessageButton.Click, AddressOf StopPublishingMessage
    Else
        WriteMessageText("Failed to initialized proximity device." & vbTab)
    End If
End Sub

Private Sub PublishMessage(sender As Object, e As RoutedEventArgs)
    ' Stop publishing the current message.
    If publishedMessageId <> -1 Then
        proximityDevice.StopPublishingMessage(publishedMessageId)
    End If

    publishedMessageId =
        proximityDevice.PublishMessage("Windows.SampleMessage", MessageTextBlock.Text,
                                       AddressOf MessagePublished)
End Sub

Private Sub MessagePublished(
sender As Windows.Networking.Proximity.ProximityDevice,
    messageId As Long)

' The message has been successfully published.
End Sub

Private Sub SubscribeForMessage(sender As Object, e As RoutedEventArgs)
    ' Only subscribe for the message one time.
    If subscribedMessageId = -1 Then
        subscribedMessageId =
        proximityDevice.SubscribeForMessage("Windows.SampleMessage", AddressOf messageReceived)
    End If
End Sub

Private Sub messageReceived(
    device As Windows.Networking.Proximity.ProximityDevice,
    message As Windows.Networking.Proximity.ProximityMessage)

    MessageBlock.Text &= "Message received: " & message.DataAsString & vbTab
End Sub

Private Sub StopSubscribingForMessage(sender As Object, e As RoutedEventArgs)
    proximityDevice.StopSubscribingForMessage(subscribedMessageId)
    subscribedMessageId = -1
End Sub

Private Sub StopPublishingMessage(sender As Object, e As RoutedEventArgs)
    proximityDevice.StopPublishingMessage(publishedMessageId)
    publishedMessageId = -1
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

Remarques

Les messages continuent d’être publiés jusqu’à ce que la méthode StopPublishingMessage soit appelée ou que l’objet ProximityDevice sur l’ordinateur de publication soit libéré. Les messages sont remis à toutes les applications qui se sont abonnées pour le même type de message.

Lors de l’utilisation de la méthode PublishMessage , le seul type de message pris en charge est celui qui commence par « Windows ». Pour publier des messages à l’aide d’un autre type de message, tel que « WindowsMime » ou « NDEF:WriteTag », vous devez utiliser la méthode PublishBinaryMessage .

Le délégué MessageTransmittedHandler est appelé chaque fois qu’un message est correctement transmis à un appareil, que des applications aient ou non été abonnées au message sur cet appareil.

S’applique à

Voir aussi

• PublishMessage(String, String, MessageTransmittedHandler)
• PublishBinaryMessage(String, IBuffer, MessageTransmittedHandler)
• PublishUriMessage(Uri, MessageTransmittedHandler)
• Proximité et appui (C#/VB/C++)
• Exemple de proximité