MessageReceivedHandler Delegasikan
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Menjelaskan metode yang akan menangani peristiwa yang diaktifkan ketika pesan yang telah berlangganan telah diterima.
public delegate void MessageReceivedHandler(ProximityDevice ^ sender, ProximityMessage ^ message);
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Guid(4020963202, 63202, 18037, 160, 69, 216, 227, 32, 194, 72, 8)]
class MessageReceivedHandler : MulticastDelegate
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Guid(4020963202, 63202, 18037, 160, 69, 216, 227, 32, 194, 72, 8)]
public delegate void MessageReceivedHandler(ProximityDevice sender, ProximityMessage message);
var messageReceivedHandlerHandler = function(sender, message){
/* Your code */
}
Public Delegate Sub MessageReceivedHandler(sender As ProximityDevice, message As ProximityMessage)
Parameter
- sender
- ProximityDevice
Perangkat kedekatan yang menerima pesan.
- message
- ProximityMessage
Pesan dan data terkait yang diteruskan ke penanganan aktivitas.
- Atribut
Persyaratan Windows
Rangkaian perangkat |
Windows 10 (diperkenalkan dalam 10.0.10240.0 - for Xbox, see UWP features that aren't yet supported on Xbox)
|
API contract |
Windows.Foundation.UniversalApiContract (diperkenalkan dalam v1.0)
|
Kemampuan aplikasi |
ID_CAP_PROXIMITY [Windows Phone]
proximity
ID_CAP_PROXIMITY [Windows Phone]
|
Contoh
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);
}
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)
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
Berlaku untuk
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