How to change the emblem of a file-icon with C/C++ in GNOME?

[Ace]

I'm developing an App which works like Dropbox. I want to dynamically change
the emblem of a file during synchronization. Like this:

[image: effect I want]

Is there any solution to this with Qt/C++?

Thanks!
Here <http://stackoverflow.com/q/5846504/614951> is the URL on
stackoverflow.
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