PlayToConnection Класс

Определение

Пространство имен:

Windows.Media.PlayTo

Предоставляет сведения о подключении "Воспроизвести".

public ref class PlayToConnection sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.Deprecated("PlayToConnection may be altered or unavailable for releases after Windows 10. Instead, use CastingConnection.", Windows.Foundation.Metadata.DeprecationType.Deprecate, 65536, "Windows.Foundation.UniversalApiContract")]
class PlayToConnection final

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.Deprecated("PlayToConnection may be altered or unavailable for releases after Windows 10. Instead, use CastingConnection.", Windows.Foundation.Metadata.DeprecationType.Deprecate, 65536, "Windows.Foundation.UniversalApiContract")]
public sealed class PlayToConnection

Public NotInheritable Class PlayToConnection

Наследование

Object Platform::Object IInspectable PlayToConnection

Атрибуты

ContractVersionAttribute DeprecatedAttribute MarshalingBehaviorAttribute ThreadingAttribute

Требования к Windows

Семейство устройств	Windows 10 (появилось в 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (появилось в v1.0)

Примеры

 private Windows.Media.PlayTo.PlayToManager ptm = 
         Windows.Media.PlayTo.PlayToManager.GetForCurrentView();

 protected override void OnNavigatedTo(NavigationEventArgs e)
 {
     ptm.SourceRequested += sourceRequestHandlerWithEvents;
     ptm.SourceSelected += sourceSelectedHandler;
 }

 private void sourceRequestHandlerWithEvents(
 Windows.Media.PlayTo.PlayToManager sender,
 Windows.Media.PlayTo.PlayToSourceRequestedEventArgs e)
 {
     try
     {
         var controller = mediaElement.PlayToSource;

         controller.Connection.Error += playToConnectionError;
         controller.Connection.StateChanged += playToConnectionStageChanged;
         controller.Connection.Transferred += playToConnectionTransferred;

         e.SourceRequest.SetSource(controller);
     }
     catch (Exception ex)
     {
         messageBlock.Text += "Exception encountered: " + ex.Message + "\n";
     }
 }

 // Called when the user selects a Play To device to stream to.

 private void sourceSelectedHandler(
     Windows.Media.PlayTo.PlayToManager sender,
     Windows.Media.PlayTo.PlayToSourceSelectedEventArgs e)
 {
     if (mediaElement.Name == "iplayer") {
         if (!e.SupportsImage) {
             messageBlock.Text += e.FriendlyName + " does not support streaming images. " +
                                  "Please select a different device.";
             return;
         }
     }

     if (mediaElement.Name == "vplayer") {
         if (!e.SupportsVideo) {
             messageBlock.Text += e.FriendlyName + " does not support streaming video. " +
                                  "Please select a different device.";
             return;
         }
     }

     if (mediaElement.Name == "aplayer") {
         if (!e.SupportsAudio) {
             messageBlock.Text += e.FriendlyName + " does not support streaming audio. " +
                                  "Please select a different device.";
             return;
         }
     }

     Windows.Storage.Streams.IRandomAccessStream iconStream = e.Icon;
     Windows.UI.Xaml.Media.Imaging.BitmapImage iconBitmap = 
             new Windows.UI.Xaml.Media.Imaging.BitmapImage();
     iconBitmap.SetSource(iconStream);
     playToDeviceIconImage.Source = iconBitmap;

     playToDeviceFriendlyNameBlock.Text = e.FriendlyName;
 }

 private void playToConnectionError(
     Windows.Media.PlayTo.PlayToConnection connection,
     Windows.Media.PlayTo.PlayToConnectionErrorEventArgs e)
 {
     if (e.Code == Windows.Media.PlayTo.PlayToConnectionError.DeviceError ||
         e.Code == Windows.Media.PlayTo.PlayToConnectionError.DeviceNotResponding) 
     {
         messageBlock.Text += "Error occurred. Disconnecting.\n";
     }

     messageBlock.Text += "Error: Message = " + e.Message.ToString() + "\n";
 }

private void playToConnectionStageChanged(
    Windows.Media.PlayTo.PlayToConnection connection, 
    Windows.Media.PlayTo.PlayToConnectionStateChangedEventArgs e) 
 {
     messageBlock.Text += "StateChanged: PreviousState = " + e.PreviousState.ToString() + "\n";
     messageBlock.Text += "StateChanged: CurrentState = " + e.CurrentState.ToString() + "\n";
 }

private void playToConnectionTransferred(
    Windows.Media.PlayTo.PlayToConnection connection, 
    Windows.Media.PlayTo.PlayToConnectionTransferredEventArgs e)
 {
     messageBlock.Text += "Transferred: PreviousSource = " + e.PreviousSource.ToString() + "\n";
     messageBlock.Text += "Transferred: CurrentSource = " + e.CurrentSource.ToString() + "\n";
 }

Private ptm As Windows.Media.PlayTo.PlayToManager =
        Windows.Media.PlayTo.PlayToManager.GetForCurrentView()

Protected Overrides Sub OnNavigatedTo(e As Navigation.NavigationEventArgs)
    AddHandler ptm.SourceRequested, AddressOf sourceRequestHandlerWithEvents
    AddHandler ptm.SourceSelected, AddressOf sourceSelectedHandler
End Sub

Private Sub sourceRequestHandlerWithEvents(
    sender As Windows.Media.PlayTo.PlayToManager,
    e As Windows.Media.PlayTo.PlayToSourceRequestedEventArgs)

    Try
        Dim controller = mediaElement.PlayToSource

        AddHandler controller.Connection.Error, AddressOf playToConnectionError
        AddHandler controller.Connection.StateChanged, AddressOf playToConnectionStageChanged
        AddHandler controller.Connection.Transferred, AddressOf playToConnectionTransferred

        e.SourceRequest.SetSource(controller)
    Catch ex As Exception
        messageBlock.Text &= "Exception encountered: " & ex.Message & vbCrLf
    End Try
End Sub

' Called when the user selects a Play To device to stream to.

Private Sub sourceSelectedHandler(
    sender As Windows.Media.PlayTo.PlayToManager,
    e As Windows.Media.PlayTo.PlayToSourceSelectedEventArgs)

    If mediaElement.Name = "iplayer" Then
        If Not e.SupportsImage Then
            messageBlock.Text &= e.FriendlyName & " does not support streaming images. " &
                                 "Please select a different device."
            Return
        End If
    End If

    If mediaElement.Name = "vplayer" Then
        If Not e.SupportsVideo Then
            messageBlock.Text &= e.FriendlyName & " does not support streaming video. " &
                                 "Please select a different device."
            Return
        End If
    End If

    If mediaElement.Name = "aplayer" Then
        If Not e.SupportsAudio Then
            messageBlock.Text &= e.FriendlyName & " does not support streaming audio. " &
                                 "Please select a different device."
            Return
        End If
    End If

    Dim iconStream = e.Icon
    Dim iconBitmap = New Windows.UI.Xaml.Media.Imaging.BitmapImage()
    iconBitmap.SetSource(iconStream)
    playToDeviceIconImage.Source = iconBitmap

    playToDeviceFriendlyNameBlock.Text = e.FriendlyName
End Sub

Private Sub playToConnectionError(
    connection As Windows.Media.PlayTo.PlayToConnection,
    e As Windows.Media.PlayTo.PlayToConnectionErrorEventArgs)

    If e.Code = Windows.Media.PlayTo.PlayToConnectionError.DeviceError OrElse
        e.Code = Windows.Media.PlayTo.PlayToConnectionError.DeviceNotResponding Then

        messageBlock.Text &= "Error occurred. Disconnecting." & vbCrLf
    End If

    messageBlock.Text &= "Error: Message = " & e.Message.ToString() & vbCrLf
End Sub

Private Sub playToConnectionStageChanged(
    connection As Windows.Media.PlayTo.PlayToConnection,
    e As Windows.Media.PlayTo.PlayToConnectionStateChangedEventArgs)

    messageBlock.Text &= "StateChanged: PreviousState = " & e.PreviousState.ToString() & vbCrLf
    messageBlock.Text &= "StateChanged: CurrentState = " & e.CurrentState.ToString() & vbCrLf
End Sub

Private Sub playToConnectionTransferred(
    connection As Windows.Media.PlayTo.PlayToConnection,
    e As Windows.Media.PlayTo.PlayToConnectionTransferredEventArgs)

    messageBlock.Text &= "Transferred: PreviousSource = " & e.PreviousSource.ToString() & vbCrLf
    messageBlock.Text &= "Transferred: CurrentSource = " & e.CurrentSource.ToString() & vbCrLf
End Sub

Комментарии

Пример использования play to в приложении см. в разделе PlayReady DRM.

Свойства

State

Возвращает состояние подключения "Воспроизвести".

События

Error	Возникает при обнаружении ошибки при подключении "Воспроизвести".
StateChanged	Происходит при изменении состояния подключения "Воспроизвести".
Transferred	Происходит при переносе подключения Воспроизведения к следующему источнику воспроизведения.

См. также раздел

• Пример "Воспроизвести на"
• Пример PlayToReceiver
• Пример сервера мультимедиа