[Qgis-developer] data provider in a custom app

[Tim Sutton]

Hi


On Thu, Jan 23, 2014 at 3:58 PM, Denis Rouzaud <denis.rouzaud at gmail.com>wrote:

>  Hi all,
>
> I am trying to do a custom application using QGIS libs and I have trouble
> to use data providers (i.e. spatialite).
>
> In my application doing, QgsProviderRegistry::instance()->pluginList()
> returns " No data provider plugins are available. No vector layers can be
> loaded".
>
> Then of course, trying to create a new db as it is done on
> QgsNewSpatialiteLayerDialog is impossible (
> QgsProviderRegistry::instance()->library( "spatialite" );  )
> and loading layers with
> QgsVectorLayer* vl = new QgsVectorLayer( "dbname='path_to_sqlite_file'
> table='mytable'' (geometry) sql=", "layername", "spatialite" );
> fails.
>
> I believe I am missing something fundamental here, but I have no idea what.
>
> If anybody has a lead, thanks a lot.
>

Did you ensure the QGIS_PREFIX_PATH is set and call initQgis? See [1] for
an example.

[1] https://github.com/AIFDR/inasafe/blob/master/safe/common/testing.py#L692



Regards

Tim

>
> Cheers,
>
> Denis
>
>
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>



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