IMediaBuffer::SetLength method (mediaobj.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The SetLength method specifies the length of the data currently in the buffer.

Syntax

HRESULT SetLength(
  DWORD cbLength
);

Parameters

cbLength

Size of the data, in bytes. The value must not exceed the buffer's maximum size. Call the IMediaBuffer::GetMaxLength method to obtain the maximum size.

Return value

Returns S_OK if successful. Otherwise, returns an HRESULT value indicating the cause of the error.

Remarks

This method sets the size of the valid data currently in the buffer, not the buffer's allocated size.

Requirements

See also

IMediaBuffer Interface

Implementing IMediaBuffer