IAudioSessionManager::GetSimpleAudioVolume method (audiopolicy.h)

The GetSimpleAudioVolume method retrieves a simple audio volume control.

Syntax

HRESULT GetSimpleAudioVolume(
  [in]  LPCGUID            AudioSessionGuid,
  [in]  DWORD              StreamFlags,
  [out] ISimpleAudioVolume **AudioVolume
);

Parameters

[in] AudioSessionGuid

Pointer to a session GUID. If the GUID does not identify a session that has been previously opened, the call opens a new but empty session. The Sndvol program does not display a volume-level control for a session unless it contains one or more active streams. If this parameter is NULL or points to the value GUID_NULL, the method assigns the stream to the default session.

[in] StreamFlags

Specifies whether the request is for a cross-process session. Set to TRUE if the session is cross-process. Set to FALSE if the session is not cross-process.

[out] AudioVolume

Pointer to a pointer variable into which the method writes a pointer to the ISimpleAudioVolume interface of the audio volume control object. This interface represents the simple audio volume control for the current process. The caller is responsible for releasing the interface, when it is no longer needed, by calling the interface's Release method. If the Activate call fails, *AudioVolume is NULL.

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.

Requirements

See also

IAudioSessionManager Interface

ISimpleAudioVolume Interface