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IAudioSessionManager::GetAudioSessionControl

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IAudioSessionManager::GetAudioSessionControl

The GetAudioSessionControl method retrieves an audio session control.

HRESULT GetAudioSessionControl(
  LPCGUID  AudioSessionGuid,
  BOOL  CrossProcessSession,
  IAudioSessionControl  **SessionControl
);

Parameters

AudioSessionGuid

[in]  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.

CrossProcessSession

[in]  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.

SessionControl

[out]  Pointer to a pointer variable into which the method writes a pointer to the IAudioSessionControl interface of the audio session control object. The caller is responsible for releasing the interface, when it is no longer needed, by calling the interface's Release method. If the call fails, *SessionControl 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.

Return code Description
AUDCLNT_E_NOT_INITIALIZED The audio stream has not been successfully initialized.
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.
E_POINTER Parameter SessionControl is NULL.
E_MEMORY Out of memory.

Remarks

For a code example that calls this method, see Audio Events for Legacy Audio Applications.

Requirements

Client: Windows Vista

Header: Include Audiopolicy.h.

See Also

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