IMFMediaBuffer::SetCurrentLength method (mfobjects.h)

Sets the length of the valid data in the buffer.


HRESULT SetCurrentLength(
  [in] DWORD cbCurrentLength


[in] cbCurrentLength

Length of the valid data, in bytes. This value cannot be greater than the allocated size of the buffer, which is returned by the IMFMediaBuffer::GetMaxLength method.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code Description
The method succeeded.
The specified length is greater than the maximum size of the buffer.


Call this method if you write data into the buffer.

This interface is available on the following platforms if the Windows Media Format 11 SDK redistributable components are installed:

  • Windows XP with Service Pack 2 (SP2) and later.
  • Windows XP Media Center Edition 2005 with KB900325 (Windows XP Media Center Edition 2005) and KB925766 (October 2006 Update Rollup for Windows XP Media Center Edition) installed.


Requirement Value
Minimum supported client Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header mfobjects.h (include Mfidl.h)
Library Mfuuid.lib

See also


Media Buffers