PlayToSourceRequest 类

定义

命名空间:

Windows.Media.PlayTo

表示将媒体元素与“播放目标”连接的请求。

public ref class PlayToSourceRequest sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Deprecated("PlayToSourceRequest may be altered or unavailable for releases after Windows 10.", Windows.Foundation.Metadata.DeprecationType.Deprecate, 65536, "Windows.Foundation.UniversalApiContract")]
class PlayToSourceRequest final

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

Public NotInheritable Class PlayToSourceRequest

继承

Object Platform::Object IInspectable PlayToSourceRequest

属性

ContractVersionAttribute DeprecatedAttribute MarshalingBehaviorAttribute

Windows 要求

设备系列	Windows 10 (在 10.0.10240.0 中引入)
API contract	Windows.Foundation.UniversalApiContract (在 v1.0 中引入)

示例

// Play To Contract

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

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

private void sourceRequestHandler(
    Windows.Media.PlayTo.PlayToManager sender,
    Windows.Media.PlayTo.PlayToSourceRequestedEventArgs e)
{
    try
    {
        e.SourceRequest.SetSource(mediaElement.PlayToSource);
    }
    catch (Exception ex)
    {
        messageBlock.Text += "Exception encountered: " + ex.Message + "\n";
    }
}

' Play To Contract

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

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

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

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

注解

PlayToSourceRequest 类表示用户请求源媒体流式传输到“播放到”目标。 在 SourceRequested 事件期间，使用 PlayToSourceRequestedEventArgs 类的 SourceRequest 属性 将媒体从应用程序传递到“播放到”。

若要进行异步调用以检索要流式传输的媒体元素，可以使用 GetDeferral 方法为 创建延迟。 然后，播放到将等待你提供媒体元素，直到将延迟标记为完成。

有关如何在应用程序中使用“播放到”的示例，请参阅 PlayReady DRM。

属性

Deadline

获取提供“播放到”源元素的时间限制。

方法

DisplayErrorString(String)	在“播放到”UI 中显示错误消息。
GetDeferral()	延迟将媒体源连接到“播放到”目标。
SetSource(PlayToSource)	设置源元素以连接到“播放到”目标。

另请参阅

• 播放到示例
• PlayToReceiver 示例
• 媒体服务器示例