GetHostName?

I'm having difficulty with the GetHostName call from the SDK.

Has anyone gotten it to work. I either get nothing or compiler errors due to
misuse.

Here is the GetHostName section from the controlsurface,idl file
---------------------------------------------------------------------------------------------
    // obtain the host name
    HRESULT GetHostName(
        [out] LPSTR pszHostName,    // if NULL, just retrieves required buf len
        [in, out] DWORD* pdwLen
        );
--------------------------------------------------------------------------------------------------
Thanks in advance!

:Ron