Google OAuth2 from desktop for email

veenusav

I have overridden QOAuthOobReplyHandler and retried grant() when a rejection comes. the result is two browser tabs with "you can close this window". still I cannot get e-mail or id of the person who logged in. I just want a unique ID from google that a user exists. I have seen many people viewed my question. but reply. does it mean that nobody used NetworkAuth or OAuth2 with google is a niche ? do anybody knew the e-mail of the person who blogged(http://blog.qt.io/blog/2017/01/25/connecting-qt-application-google-services-using-oauth-2-0/)