Solved it.
It seems we have to initialize QgsProviderRegistry with valid plugin
directory path.
QString myPluginsDir = "/usr/lib/qgis/plugins";
QgsProviderRegistry::instance(myPluginsDir);
Still can't see the raster but at least I passed the "isValid" problem.
2015-02-03 18:34 GMT+02:00 Matthias Ludwig <[email protected]>:
> I'am have no experiences with writin C++ apps but on the python side you
> have to set the prefix paths and init qgis at app start. Otherwise you'll
> get strange errors, like yours.
>
> QgsApplication.prefixPath() --> get your path from a working QGIS python
> console
>
> QgsApplication.setPrefixPath(<path>, True)
> QgsApplication.initQgis()
>
> Hope this helps.
>
>
>
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