Does anybody know how to post new photos to Flickr with QT?

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C++

QT-Creator

Anyone can help out how to post new photos with Flickr API successfully with QT? I constructed the HTTP header and the Post body by myself, and call QNetworkManager::post() to post new photos to the server. But it failed all the time. It reported "Invalid auth token!". But my auth token are OK when used to post other messages. Can anyone give me a valid post construct in QT to show me how to construct everything necessary by hand?

Thanks!