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IAudioSessionControl::SetIconPath

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IAudioSessionControl::SetIconPath

The SetIconPath method assigns a display icon to the current session.

HRESULT SetIconPath(
  LPCWSTR  Value,
  LPCGUID  EventContext
);

Parameters

Value

[in]  Pointer to a null-terminated, wide-character string that specifies the path and file name of an .ico, .dll, or .exe file that contains the icon. For information about icon paths, see the Windows SDK documentation.

EventContext

[in]  Pointer to the event-context GUID. If a call to this method generates an icon-change event, the session manager sends notifications to all clients that have registered IAudioSessionEvents interfaces with the session manager. The session manager includes the EventContext pointer value with each notification. Upon receiving a notification, a client can determine whether it or another client is the source of the event by inspecting the EventContext value. This scheme depends on the client selecting a value for this parameter that is unique among all clients in the session. 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
E_POINTER Parameter Value is NULL.
AUDCLNT_E_DEVICE_INVALIDATED The audio endpoint device has been unplugged, or the audio hardware or associated hardware resources have been reconfigured, disabled, removed, or otherwise made unavailable for use.
AUDCLNT_E_SERVICE_NOT_RUNNING The Windows audio service is not running.

Remarks

In Windows Vista, the system-supplied program, Sndvol.exe, uses the display icon (along with the display name) to label the volume control for the session. If the client does not call SetIconPath to assign an icon to the session, the Sndvol program uses the icon from the application window as the default icon for the session.

In the case of a cross-process session, the session is not associated with a single application process. Thus, Sndvol has no application-specific icon to use by default, and the client must call SetIconPath to avoid displaying a meaningless icon.

The display icon does not persist beyond the lifetime of the IAudioSessionControl object. Thus, after all references to the object are released, a subsequently created version of the object (with the same application, same session GUID, and same endpoint device) will once again have a default icon until the client calls SetIconPath.

The client can retrieve the display icon for the session by calling the IAudioSessionControl::GetIconPath method.

Requirements

Client: Windows Vista

Header: Include Audiopolicy.h.

See Also

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