IWMWriter 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 It has been superseded by Source Reader and Sink Writer.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 IWMWriter interface is used to write ASF files. It includes methods for allocating buffers, setting and retrieving input properties, and setting profiles and output file names. The writer object exposes this interface. To create the writer object, call the WMCreateWriter function.
Inheritance
The IWMWriter interface inherits from the IUnknown interface. IWMWriter also has these types of members:
Methods
The IWMWriter interface has these methods.
| IWMWriter::AllocateSample The AllocateSample method allocates a buffer that can be used to provide samples to the writer. |
| IWMWriter::BeginWriting The BeginWriting method initializes the writing process. |
| IWMWriter::EndWriting The EndWriting method performs tasks required at the end of a writing session. |
| IWMWriter::Flush The functionality of the Flush method has been removed, because IWMWriter::EndWriting performs the needed checks internally. For compatibility with older applications, calls to flush will always return S_OK even though the call does nothing. |
| IWMWriter::GetInputCount The GetInputCount method retrieves the number of uncompressed input streams. |
| IWMWriter::GetInputFormat The GetInputFormat method retrieves possible media formats for the specified input. |
| IWMWriter::GetInputFormatCount The GetInputFormatCount method retrieves the number of media format types supported by this input on the writer. |
| IWMWriter::GetInputProps The GetInputProps method retrieves the current media properties of a specified input stream. |
| IWMWriter::SetInputProps The SetInputProps method specifies the media properties of an input stream. |
| IWMWriter::SetOutputFilename The SetOutputFilename method specifies the name of the file to be written. |
| IWMWriter::SetProfile The SetProfile method specifies the profile to use for the current writing task. |
| IWMWriter::SetProfileByID The SetProfileByID method specifies the profile to use for the current writing task, identifying the profile by its GUID. |
| IWMWriter::WriteSample The WriteSample method passes in uncompressed data to be compressed and appended to the file that is being created. |
Requirements
| Target Platform | Windows |
| Header | wmsdkidl.h |