How can I set default audio device In Vista

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Hello,
I have a problem must to be resolved soon, I have looked for a lot of information and published in many forums, unfortunately, that is still not resolved .
I can get default render endpoint device by using IMMDeviceEnumerator::GetDefaultAudioEndpoint function, and get all endpoint by using other interface, But I did not find such a function similar to “SetDefaultEndpoint”， I can not change default endpoint device in my program, How to set default audio device in vista by code?
Thanks.

Posted 27-Apr-10 22:49pm

Jackzhonh

Updated 29-Apr-10 6:33am

Richard MacCutchan

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**`Randor`** · Answer 1 · 2010-04-30T07:22:00

Hi,

Microsoft does not provide a progmatic method for setting the default audio device. You could probably manipulate the registry directly to change the default audio device. On Windows XP and below the following will work:

Changing your Windows audio device programmatically using VC++[^]

On Vista and above the registry key is located at:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio

There is an undocumented/unsupported COM interface IPolicyConfig which is demonstrated here: http://eretik.omegahg.com/download/DefSound.rar[^]

Best Wishes,
-David Delaune