NTLM认证登录问题---关于域用户

draeag

QNetworkAccessManager* m_pNetworkManager = new QNetworkAccessManager(this);
connect(m_pNetworkManager, SIGNAL(authenticationRequired(QNetworkReply*, QAuthenticator*)),
        SLOT(slot_authenticationRequired(QNetworkReply*, QAuthenticator*)));

m_pNetworkReply = m_pNetworkManager->post(netRequest,contentByteArray);//发起post请求

void Httpxxx::slot_authenticationRequired(QNetworkReply *reply, QAuthenticator *auth)
{
    auth->setUser(m_strUserName);
    auth->setPassword(m_strPassWord);
}

非域用户的情况下在发送post请求后，会调用slot_authenticationRequired，为什么域用户的情况下就不再调用了，而是直接用当前登录的域用户进行了验证，想用自己设置的其它用户登录应该如何设置？
官方文档有这么一句话，但不知道如何处理？

在QAuthenticator的说明中：
NTLM version 2

The NTLM authentication mechanism currently supports no incoming or outgoing options.On Windows, if no user has been set,domain\user credentials will be searched for on the local system to enable Single-Sign-On functionality.

这个no user has been set ,如何 进行set ?