IWMHeaderInfo3 interface
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.
Methods
The IWMHeaderInfo3 interface has these methods.
| Method | Description |
|---|---|
| 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
| Target Platform | Windows |
| Header | wmsdkidl.h |