IWMPContentPartner::GetListContents method (contentpartner.h)

[アーティクル]
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 It has been superseded by MediaPlayer.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 GetListContents method initiates the retrieval of a dynamic list.

Syntax

HRESULT GetListContents(
  [in] BSTR    location,
  [in] VARIANT *pContext,
  [in] BSTR    bstrListType,
  [in] BSTR    bstrParams,
  [in] DWORD   dwListCookie
);

Parameters

[in] location

A library location constant that specifies the type of library view that will have its list retrieved. For example, the constant g_szCPListID specifies that a particular list will be retrieved.

[in] pContext

The ID of the specific item that will have its list retrieved. For example, if location is g_szCPListID, then this parameter is the ID of the list that will be retrieved.

[in] bstrListType

A library location constant that specifies the type of an individual list item. For example, the constant g_szCPAlbumID specifies that the items in the list are albums.

[in] bstrParams

Parameters, meaningful only to the online store, associated with the retrieved list. See Remarks.

[in] dwListCookie

A cookie used to identify the list retrieval operation. (The plug-in passes this cookie to IWMPContentPartnerCallback::AddListContents and IWMPContentPartnerCallback::ListContentsComplete.)

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

Retrieving list contents is an asynchronous operation. This method should initiate the retrieval and return immediately. Then the plug-in must make one or more calls to IWMPContentPartnerCallback::AddListContents to supply Windows Media Player with the requested list contents. When the plug-in has supplied all the data, it must call IWMPContentPartnerCallback::ListContentsComplete to signal the end of the operation. In each case, the plug-in passes the cookie provided in dwListCookie to identify the correct list retrieval session.

Requirements

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

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