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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 SetActualDataLength method sets the length of the valid data in the buffer. This method implements the IMediaSample::SetActualDataLength method.
Syntax
HRESULT SetActualDataLength(
long lLen
);
Parameters
-
lLen
-
Length of the valid data, in bytes.
Return value
Returns one of the HRESULT values shown in the following table.
| Return code | Description |
|---|---|
|
Success. |
|
lLen is larger than the allocated buffer size. |
Remarks
This method sets the CMediaSample::m_lActual member variable.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|