IWMReader::GetOutputCount 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 It has been superseded by Source Reader and Sink Writer.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 GetOutputCount method retrieves the number of uncompressed media streams that will be delivered for the file loaded in the reader.
Syntax
HRESULT GetOutputCount(
[out] DWORD *pcOutputs
);
Parameters
[out] pcOutputs
Pointer to a count of outputs.
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 pcOutputs parameter is NULL. |
|
The method failed for an unspecified reason. |
Remarks
A file with mutually exclusive streams contains several streams that are delivered to the same output. But only one of those streams can be delivered at a time during playback. When reading a file, you can identify its outputs by looping through the outputs and getting the media properties of each by calling IWMReader::GetOutputProps.
This method is synchronous and does not result in any messages being sent to the status callback.
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) |