IWMPContentPartnerCallback::DownloadTrack method (contentpartner.h)

项目
4/26/2023

[The feature associated with this page, Windows Media Player SDK, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of Windows Media Player SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Note This section describes functionality designed for use by online stores. Use of this functionality outside the context of an online store is not supported.

The DownloadTrack method instructs Windows Media Player to download or not to download a particular media item.

Syntax

HRESULT DownloadTrack(
  [in] DWORD   cookie,
  [in] BSTR    bstrTrackURL,
  [in] DWORD   dwServiceTrackID,
  [in] BSTR    bstrDownloadParams,
  [in] HRESULT hrDownload
);

Parameters

[in] cookie

A cookie that identifies a download session. Windows Media Player previously supplied this cookie to the content partner plug-in by calling IWMPContentPartner::Download.

[in] bstrTrackURL

The URL of the track to download.

[in] dwServiceTrackID

The ID of the track in question.

[in] bstrDownloadParams

Data that the online store wants to associate with the track in question. Windows Media Player does not interpret this data; it is meaningful only to the online store. Windows Media player passes this data back to the online store when it calls IWMPContentPartner::DownloadTrackComplete.

[in] hrDownload

An HRESULT that specifies whether to download the track. Any success code specifies that the Player should download the track. Any failure code specifies that the Player should not download the track.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.

Remarks

For an explanation of how the Player and the plug-in work together to download a set of tracks, see Downloading Media Content.

This method must be called only after a license has been predelivered for the file. The file will be placed in the user's Music folder and automatically added to the library when downloading is complete.

Requirements

Requirement	Value
Minimum supported client	Windows Media Player 11
Target Platform	Windows
Header	contentpartner.h

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