IMFByteStream::EndWrite method (mfobjects.h)

Completes an asynchronous write operation.


  [in]  IMFAsyncResult *pResult,
  [out] ULONG          *pcbWritten


[in] pResult

Pointer to the IMFAsyncResult interface. Pass in the same pointer that your callback object received in the IMFAsyncCallback::Invoke method.

[out] pcbWritten

Receives the number of bytes that were written.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.


Call this method when the IMFByteStream::BeginWrite method completes asynchronously.

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