When attempting to use IID_IXAudio2 you will get a linker error, this happens
irregardless of the libraries added to the build. As a simple example, add a
single line to main in XAudio2BasicSound such that it reads:
GUID g = IID_IXAudio2;
You will get a linker error:

_IID_IXAudio2

error LNK1120: 1 unresolved externals

We encountered this while writing the XAudio2 support modules for SlimDX.

On Tue, 13 May 2008 13:27:02 -0700, Washu Hibiki wrote:

Try using:

GUID g = __uuidof(IXAudio2); // there are two underscores :)

instead.

Yes, this is roughly the solution we ended up going with. I was just bringing
it up since I consider it a bug in the framework (exposing the IID, but not
actually exporting it). I couldn't remember where to post such bug reports,
so posted it here.

"The March Hare [MVP]" wrote:

On Tue, 13 May 2008 23:06:02 -0700, Washu Hibiki wrote:

Why didn't you say so?

directx@microsoft.com

or

xna@microsoft.com

(reply is not guaranteed)

DXGUID.LIB in the DirectX SDK has will be updated in the upcoming June 2008
release. This includes removing GUIDs for the deprecated APIs dropped in
November 2007 (Direct3D 8 and prior, Direct3D RM except the .x file related
GUIDs, DirectMusic, DirectPlay, DirectPlay Voice), adding some missing GUIDs
for XAudio2 and Direct3D 10.1, and updating from XACT to XACT3 GUIDs.

DXGUID is just a convience. You can always use the GUID_DEFS_ONLY or
INITGUID #defines in one of your project link modules to cause the various
headers to declare an instance of the GUID.