IMFPMediaPlayer::CreateMediaItemFromObject method (mfplay.h)
Creates a media item from an object.
HRESULT CreateMediaItemFromObject( IUnknown *pIUnknownObj, BOOL fSync, DWORD_PTR dwUserData, IMFPMediaItem **ppMediaItem );
A pointer to the object's IUnknown interface. See Remarks.
If TRUE, the method blocks until it completes. If FALSE, the method does not block and completes asynchronously.
Application-defined value to store in the media item. To retrieve this value from the media item, call IMFPMediaItem::GetUserData.
Receives a pointer to the IMFPMediaItem interface. The caller must release the interface. If fSync is TRUE, this parameter must be a valid pointer. If bSync is FALSE, this parameter must be NULL.
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
||The method succeeded.|
||Invalid request. This error can occur when fSync is FALSE and the application did not provide a callback interface. See Remarks.|
||The object's Shutdown method was called.|
The pIUnknownObj parameter must specify one of the following:
- A pointer to a media source. Media sources expose the IMFMediaSource interface. It is the caller's responsibility to call IMFMediaSource::Shutdown on the media source.
- A pointer to a byte stream. Byte streams expose the IMFByteStream interface. Internally, the method calls the IMFSourceResolver::CreateObjectFromByteStream method to create a media source from the byte stream. Therefore, a byte-stream handler must be registered for the byte stream. For more information about byte-stream handlers, see Scheme Handlers and Byte-Stream Handlers.
The CreateMediaItemFromObject method can be called either synchronously or asynchronously:
- If fSync is TRUE, the method completes synchronously. The IMFPMediaItem pointer is returned in the ppMediaItem parameter.
- If fSync is FALSE, the method completes asynchronously. When the operation completes, the application's IMFPMediaPlayerCallback::OnMediaPlayerEvent callback method is invoked. The event type is MFP_EVENT_TYPE_MEDIAITEM_CREATED. The event data contains the IMFPMediaItem pointer for the new media item.
If you make multiple asynchronous calls to CreateMediaItemFromObject, they are not guaranteed to complete in the same order. Use the dwUserData parameter to match created media items with pending requests.
- Call QueryInterface on the IMFPMediaPlayer pointer to get the IPropertyStore interface.
- Call IPropertyStore::SetValue to set properties for the media source. For a list of configuration properties, see Configuring a Media Source. Third-party media sources may define custom properties.
- Call the CreateMediaItemFromObject method to create the media item.
|Minimum supported client||Windows 7 [desktop apps only]|
|Minimum supported server||Windows Server 2008 R2 [desktop apps only]|