IMFAsyncResult::GetObject method

Returns an object associated with the asynchronous operation. The type of object, if any, depends on the asynchronous method that was called.


HRESULT GetObject(
  [out] IUnknown **ppObject


ppObject [out]

Receives a pointer to the object's IUnknown interface. If no object is associated with the operation, this parameter receives the value NULL. If the value is not NULL, the caller must release the interface.

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.


There is no object associated with this asynchronous result.



Typically, this object is used by the component that implements the asynchronous method. It provides a way for the function that invokes the callback to pass information to the asynchronous End... method that completes the operation.

If you are implementing an asynchronous method, you can set the object through the punkObject parameter of the MFCreateAsyncResult function.

If the asynchronous result object's internal IUnknown pointer is NULL, the method returns E_POINTER.

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

Asynchronous Callback Methods