IWMPStringCollection2::getAttributeCountByType method (wmp.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 It has been superseded by MediaPlayer.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.]

The getAttributeCountByType method retrieves the number of attributes associated with the specified string collection index, attribute name, and language.

Syntax

HRESULT getAttributeCountByType(
  [in]  long lCollectionIndex,
  [in]  BSTR bstrType,
  [in]  BSTR bstrLanguage,
  [out] long *plCount
);

Parameters

[in] lCollectionIndex

A long specifying the zero-based index of the string collection item from which to get the attribute.

[in] bstrType

BSTR containing the name of the attribute.

[in] bstrLanguage

BSTR containing the language. If the value is set to null or "" (empty string), the current locale string is used. Otherwise, the value must be a valid RFC 1766 language string such as "en-us".

[out] plCount

Pointer to a long that receives the count.

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

This method is used to determine the number of attributes corresponding to a particular attribute name for a given StringCollection item. Index numbers can then be passed to the fourth parameter of the getItemInfoByType method.

To use this method, read access to the library is required. For more information, see Library Access.

Windows Media Player 10 Mobile: This method is not supported.

Requirements

Requirement	Value
Minimum supported client	Windows Media Player 11.
Target Platform	Windows
Header	wmp.h
DLL	Wmp.dll

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