New Post: Invoke REST Service with windows authentication

Hi,
I have a WCF REST Service for which I have enabled the "windows authentication".
I am trying to write REST Client which will invoke this service by passing the current logged in windows user credentials ( LoggedIn User Token).

I see , only "Credenticals" structure in HttpClient.h which takes basic user name and password. But I will not be having access to username and password for the already logged in current user and I want to achieve "single sign on".

Since I am new, I would need your help to get the required API to achive this.

Thanks.