IMFMediaBuffer::GetMaxLength method (mfobjects.h)

Retrieves the allocated size of the buffer.


HRESULT GetMaxLength(
  [out] DWORD *pcbMaxLength


[out] pcbMaxLength

Receives the allocated size of the buffer, 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
The method succeeded.


The buffer might or might not contain any valid data, and if there is valid data in the buffer, it might be smaller than the buffer's allocated size. To get the length of the valid data, call IMFMediaBuffer::GetCurrentLength.

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