I need to call a function in a WebService from a VC++ 7.1 project. The
WebService requires NTLM authentication and should be the user of the
calling program. How should this be done?

I have found this article from Microsoft:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wininet/wininet
/handling_authentication.asp
But it looks that it's very low-level. Even if I copy the code generated by
the sproxy.exe program and manually change it; then there still are calls to
CSoapWininetClient::SendRequest (defined in atlsoap.h) which indirectly call
HttpSendRequest, mentioned in the article. Does this mean that I have to
change / write all the code in atlsoap.h by myself too?

And even then; in this article is described how to set the username and
password manually by calling InternetSetOption (although it didn't work for
me). But I don't want the user to enter the data again; he is logged in
already in Windows. I just want to send his credentials to the WebService
like Internet Explorer does this too (when the option User Authentication /
Logon / "Automatic logon only in Intranet zone" or "Automatic logon with
current username and password" is set).

How can I do this?

Eric

P.S. Sorry if I'm in the wrong newsgroup; it's a little difficult for this
subject.