IAudioLoudness::SetEnabled method (devicetopology.h)

The SetEnabled method enables or disables the loudness control.


HRESULT SetEnabled(
  [in] BOOL    bEnable,
  [in] LPCGUID pguidEventContext


[in] bEnable

The new loudness state. If bEnable is TRUE (nonzero), the method enables loudness. If FALSE, it disables loudness.

[in] pguidEventContext

Context value for the IControlChangeNotify::OnNotify method. This parameter points to an event-context GUID. If the SetEnabled call changes the state of the loudness control, all clients that have registered IControlChangeNotify interfaces with that control receive notifications. In its implementation of the OnNotify method, a client can inspect the event-context GUID to discover whether it or another client is the source of the control-change event. If the caller supplies a NULL pointer for this parameter, the client's notification method receives a NULL context pointer.

Return value

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code Description
Out of memory.


Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header devicetopology.h

See also

IAudioLoudness Interface