A book on Qt5?
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All you need is to read a Qt4 book and follow the Qt 5 porting guide (shipped in docs of every Qt 5 version) to update the examples. Qt 5 and Qt 4 are really 95+% compatible with each other.
And about Qt5 books - well, you can't force people to write one, right? Check out "this one":http://qmlbook.org/.
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Qt4 books are perfectly ok to learn Qt Widgets since they pratically haven't changed in Qt5.
And for learning QML / Qt quick, the on-line book Sierdzio indicated look really good. And I think much more will come, has Qt grows has a mobile plataform, especially now that Android and iOS are supported. Microsoft C# seems to be more popular (wich doesn't mean it's technically better :) so probably that's the reason why more books are available.
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Yeah, OK. I'll give it a new go with the porting guide in place.
Wasn't aware of that and I had a bad day (car broke down, refrigerator stopped working, things like that) so I was quite annoyed generally.The books probably has a slightly higher value than estimated earlier... ;-)