IWMHeaderInfo::GetAttributeCount method (wmsdkidl.h)
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The GetAttributeCount method returns the number of attributes defined in the header section of the ASF file. This method is replaced by IWMHeaderInfo3::GetAttributeCountEx and IWMHeaderInfo3::GetAttributeIndices, and should no longer be used.
Syntax
HRESULT GetAttributeCount(
[in] WORD wStreamNum,
[out] WORD *pcAttributes
);
Parameters
[in] wStreamNum
WORD containing the stream number. Pass zero for file-level attributes.
[out] pcAttributes
Pointer to a count of the attributes.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
|
The object is not in a configurable state, or no profile has been set. |
|
wStreamNum is not a valid stream number, or pcAttributes is NULL. |
|
pcAttributes is not a valid pointer. |
|
The method failed for an unspecified reason. |
Remarks
Attributes in MP3 files cannot be specific to a particular stream. For MP3 files, always set the stream number to zero.
Requirements
| Minimum supported client | Windows 2000 Professional [desktop apps only],Windows Media Format 7 SDK, or later versions of the SDK |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | wmsdkidl.h (include Wmsdk.h) |
| Library | Wmvcore.lib; WMStubDRM.lib (if you use DRM) |