[QGIS-Developer] [Beginner] - Need examples Qgis c++ with Qt

[Công Nam Phạm]

I tried create own application with Qt create 3.5.0 and Qgis 2.14, but
unsuccess. I found some example from
https://github.com/qgis/QGIS-Code-Examples and try, so it's fail.
I need examples qgis with QtCreate.
Thank for help!

P/S: my project attached. I don't load layer to canvas
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