IMFMediaEventQueue::QueueEventParamVar method (mfobjects.h)

Creates an event, sets a PROPVARIANT as the event data, and puts the event in the queue.

Call this method inside your implementation of IMFMediaEventGenerator::QueueEvent. Pass the parameters from that method directly to this method.

You can also call this method when your component needs to raise an event that does not contain attributes. If the event data is an IUnknown pointer, you can use IMFMediaEventQueue::QueueEventParamUnk. If the event contains attributes, use IMFMediaEventQueue::QueueEvent instead.


HRESULT QueueEventParamVar(
  [in] MediaEventType    met,
  [in] REFGUID           guidExtendedType,
  [in] HRESULT           hrStatus,
  [in] const PROPVARIANT *pvValue


[in] met

Specifies the type of the event to be added to the queue. The event type is returned by the event's IMFMediaEvent::GetType method. For a list of event types, see Media Foundation Events.

[in] guidExtendedType

The extended type of the event. If the event does not have an extended type, use the value GUID_NULL. The extended type is returned by the event's IMFMediaEvent::GetExtendedType method.

[in] hrStatus

A success or failure code indicating the status of the event. This value is returned by the event's IMFMediaEvent::GetStatus method.

[in] pvValue

Pointer to a PROPVARIANT that contains the event value. This parameter can be NULL. This value is returned by the event's IMFMediaEvent::GetValue 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 Shutdown method was called.


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 | 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