IWMReaderTypeNegotiation::TryOutputProps 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 It has been superseded by Source Reader and Sink Writer.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 TryOutputProps method ascertains whether certain changes to the properties of an output are possible.
Syntax
HRESULT TryOutputProps(
[in] DWORD dwOutputNum,
[in] IWMOutputMediaProps *pOutput
);
Parameters
[in] dwOutputNum
DWORD containing the output number.
[in] pOutput
Pointer to the IWMOutputMediaProps interface of an output media properties object.
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. |
|
dwOutputNumber is too large. |
|
Unspecified error. |
|
Media type of object is not valid. |
|
Not enough memory to complete the task. |
Remarks
This method is usually used to test different output properties to find out if they are possible; for example, to find out whether a video stream can be rendered at a resolution of 320 x 240 pixels in 16-bit color. To perform this testing, call IWMReader::GetOutputProps to retrieve an IWMOutputMediaProps interface, and alter properties by using that interface. Then test the modified object with the TryOutputProps method. If it returns S_OK, the new properties would work.
Requirements
| Requirement | Value |
|---|---|
| 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) |