IWMStreamPrioritization::GetPriorityRecords method (wmsdkidl.h)

项目
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 It has been superseded by Source Reader and Sink Writer.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 GetPriorityRecords method retrieves the list of streams and their priorities from the profile.

Syntax

HRESULT GetPriorityRecords(
  [out]     WM_STREAM_PRIORITY_RECORD *pRecordArray,
  [in, out] WORD                      *pcRecords
);

Parameters

[out] pRecordArray

Pointer to an array of WM_STREAM_PRIORITY_RECORD structures. This array will receive the current stream priority data.

[in, out] pcRecords

Pointer to a WORD that receives the count of records.

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	pcRecords is NULL.
ASF_E_BUFFERTOOSMALL	pcRecords specifies fewer records than exist in the stream prioritization object.

Remarks

You should make two calls to GetPriorityRecords. On the first call, pass NULL as pRecordArray. On return, the value of pcRecords is set to the number of prioritization records in the stream priority object. Then you can allocate the required amount of memory for the array and pass a pointer to it as pRecordArray in the second call.

If you pass an array as pRecordArray that does not have enough elements allocated to contain the data, an error code of ASF_E_BUFFERTOOSMALL is returned. When returning this error code, the method still sets the value of pcRecords.

Records in a stream prioritization object are given in order of decreasing priority

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series 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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