Note that you shouldve asked on this website instead - Windows 7 Forums

But, to answer your question, Vista and Windows 7 have the option to allow any program to use a particular device automatically. Even when installing any new program.

(Example) (in the taskbar sound icon)


(Set default device here, unless you only have one input/output deviced enabled)

Originally Posted by arunsankar

I am really sorry for posting it here.

But here we are doing that manually, right?'
I am having an application which uses a virtual audio driver and I want that device to be the default sound device when the application starts. So it will be really helpful if can change it programatically. Is that possible in vista and win 7?

By having those box's checked (they are already on default), the program should automatically use THAT default sound device, unless there is an unsupported feature with the program and sound device.

Originally Posted by arunsankar

These options are checked in my system and I can also set a device as the default one manually. But I am unable to set this as programatically.

Any program that uses sound, AUTOMATICALLY uses the default sound device that you choose in that area.

If you have installed a new sound device (soundcard), you mainly want to just use the hardware's set of sound device's and disable the onboard sound in your BIOS.

Usually, if the program has a VOIP function (Games for Windows - LIVE, MSN messenger, Steam-based games) in it or either someone uses a DVD codec application (PowerDVD, Nero, Etc.), most of the time they can set what device for THAT program to use when playing/using that program (there is usually an options menu with that function there).

If this still doesnt answer your question, exactly what are you trying to do with a sound device regarding Windows 7?

Forgive me lol. your programming an app. right? Then you'd have to look that up somewhere else because i have no familiarity with that. Sorry.