Extract a zip file
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There is an "FAQ entry":http://developer.qt.nokia.com/faq/answer/how_to_compress_data_with_qt on that. Please reference it.
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Take a look at "QuaZip":http://quazip.sourceforge.net/.
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[quote author="Lukas Geyer" date="1316154047"]Take a look at "QuaZip":http://quazip.sourceforge.net/.[/quote]
Which is also mentioned in the FAQ entry, just like several other options...