IWMHeaderInfo3 interface (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 It has been superseded by Source Reader and Sink Writer.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 IWMHeaderInfo3 interface supports the following new metadata features:
- Attribute data in excess of 64 kilobytes.
- Multiple attributes with the same name.
- Attributes in multiple languages.
The IWMHeaderInfo3 interface is implemented by the metadata editor object, the writer object, the reader object, and the synchronous reader object. To obtain a pointer to an instance, call the QueryInterface method of any other interface in the desired object.
Inheritance
The IWMHeaderInfo3 interface inherits from IWMHeaderInfo2. IWMHeaderInfo3 also has these types of members:
Methods
The IWMHeaderInfo3 interface has these methods.
| IWMHeaderInfo3::AddAttribute The AddAttribute method adds a metadata attribute. To change the value of an existing attribute, use the IWMHeaderInfo3::ModifyAttribute method. |
| IWMHeaderInfo3::AddCodecInfo The AddCodecInfo method adds codec information to a file. When you copy a compressed stream from one file to another, use this method to include the information about the encoding codec in the file header. |
| IWMHeaderInfo3::DeleteAttribute The DeleteAttribute method removes an attribute from the file header. |
| IWMHeaderInfo3::GetAttributeByIndexEx The GetAttributeByIndexEx method retrieves the value of an attribute specified by the attribute index. |
| IWMHeaderInfo3::GetAttributeCountEx The GetAttributeCountEx method retrieves the total number of attributes associated with a specified stream number. |
| IWMHeaderInfo3::GetAttributeIndices The GetAttributeIndices method retrieves a list of valid attribute indices within specified parameters. |
| IWMHeaderInfo3::ModifyAttribute The ModifyAttribute method modifies the settings of an existing attribute. |
Remarks
For information about using the writer for metadata editing, see To Edit Metadata with the Writer.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | wmsdkidl.h |