IWMReaderTypeNegotiation::TryOutputProps method (wmsdkidl.h)

Статья
4/26/2023

[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 It has been superseded by Source Reader and Sink Writer.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
S_OK	The method succeeded.
E_INVALIDARG	dwOutputNumber is too large.
E_UNEXPECTED	Unspecified error.
NS_E_INVALID_OUTPUT_FORMAT	Media type of object is not valid.
E_OUTOFMEMORY	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)

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