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IWMReaderAdvanced4::IsUsingFastCache 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 It has been superseded by Source Reader and Sink Writer.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 IsUsingFastCache method queries whether the reader is using Fast Cache streaming.

Syntax

HRESULT IsUsingFastCache(
  [out] BOOL *pfUsingFastCache
);

Parameters

[out] pfUsingFastCache

Pointer to a variable that receives a Boolean value. The value is True if the reader is currently using Fast Cache streaming, or False otherwise.

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
NULL pointer argument.

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)

See also

Enabling Fast Cache Streaming from the Client

IWMReaderAdvanced4 Interface