INSSBuffer::GetMaxLength method (wmsbuffer.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 It has been superseded by Source Reader and Sink Writer.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 GetMaxLength method retrieves the maximum size to which a buffer can be set. The maximum value is set when the sample is created. If you are using IWMWriter::AllocateSample, the size you specify becomes the maximum buffer length. The actual amount of the buffer that is used can be retrieved by calling INSSBuffer::GetLength.

Syntax

C++

HRESULT GetMaxLength(
  [out] DWORD *pdwLength
);

Parameters

[out] pdwLength

Pointer to a DWORD containing the maximum length, in bytes.

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_POINTER	The pdwLength parameter is NULL.

Remarks

The maximum size of the buffer as returned by this method does not affect or reflect the size of any data unit extensions associated with the sample stored in the buffer.

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	wmsbuffer.h (include Wmsdk.h)
Library	Wmvcore.lib; WMStubDRM.lib (if you use DRM)

See also

Data Unit Extensions

INSSBuffer Interface

INSSBuffer::GetLength