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IMFAttributes::LockStore method

Locks the attribute store so that no other thread can access it. If the attribute store is already locked by another thread, this method blocks until the other thread unlocks the object. After calling this method, call IMFAttributes::UnlockStore to unlock the object.


HRESULT LockStore();


This method has no parameters.

Return value

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

Return codeDescription

The method succeeded.



This method can cause a deadlock if a thread that calls LockStore waits on a thread that calls any other IMFAttributes methods on the same object.

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.


Minimum supported client

Windows Vista [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2008 [desktop apps | Windows Store apps]


Mfobjects.h (include Mfidl.h)



See also

Attributes and Properties



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