MediaSourceAppServiceConnection.InitializeMediaStreamSourceRequested 事件

定义

命名空间:

Windows.Media.Core

由系统引发以请求初始化新的 MediaStreamSource。

// Register
event_token InitializeMediaStreamSourceRequested(TypedEventHandler<MediaSourceAppServiceConnection, InitializeMediaStreamSourceRequestedEventArgs const&> const& handler) const;

// Revoke with event_token
void InitializeMediaStreamSourceRequested(event_token const* cookie) const;

// Revoke with event_revoker
MediaSourceAppServiceConnection::InitializeMediaStreamSourceRequested_revoker InitializeMediaStreamSourceRequested(auto_revoke_t, TypedEventHandler<MediaSourceAppServiceConnection, InitializeMediaStreamSourceRequestedEventArgs const&> const& handler) const;

public event TypedEventHandler<MediaSourceAppServiceConnection,InitializeMediaStreamSourceRequestedEventArgs> InitializeMediaStreamSourceRequested;

function onInitializeMediaStreamSourceRequested(eventArgs) { /* Your code */ }
mediaSourceAppServiceConnection.addEventListener("initializemediastreamsourcerequested", onInitializeMediaStreamSourceRequested);
mediaSourceAppServiceConnection.removeEventListener("initializemediastreamsourcerequested", onInitializeMediaStreamSourceRequested);
- or -
mediaSourceAppServiceConnection.oninitializemediastreamsourcerequested = onInitializeMediaStreamSourceRequested;

Public Custom Event InitializeMediaStreamSourceRequested As TypedEventHandler(Of MediaSourceAppServiceConnection, InitializeMediaStreamSourceRequestedEventArgs) 

事件类型

TypedEventHandler<MediaSourceAppServiceConnection,InitializeMediaStreamSourceRequestedEventArgs>

注解

为 InitializeMediaStreamSourceRequestedEventArgs 注册处理程序后，调用 Start 以通知系统应用服务已准备好处理请求。

使用 InitializeMediaStreamSourceRequestedEventArgs 对象，系统将 IRandomAccessStream 和未初始化的 MediaStreamSource 对象传递到 InitializeMediaStreamSourceRequested 事件处理程序中。 应用服务应分析 IRandomAccessStream 以创建 IMediaStreamDescriptor。 如果支持请求的流格式，则应用服务可以初始化 MediaStreamSource 并开始提供示例。