[Qgis-user] Invalid data source loading vector layer using PyQGIS

[Mathieu Coudert]

Hi list,

I'm trying to load a vector layer (shapefile) using PyQGIS and especially
QgsVectorLayer constructor.
I had a look at the following link to start with :
http://www.qgis.org/pyqgis-cookbook/intro.html#python-applications
and also :
http://www.qgis.org/pyqgis-cookbook/loadlayer.html#vector-layers

So my script looks like :

*QgsApplication.setPrefixPath("/usr",True)*
*QgsApplication.initQgis()*
*myLayer = QgsVectorLayer("/tmp/data.gboundaries.shp","gboundaries","ogr")*

But I get this error message : "Data source is invalid" and my layer is
invalid.

However, it is working when I launch it in the QGIS python console.

Do I need to set/export any variable outside of QGIS to use the ogr
provider?
Does anybody has any clue about my problem?

FYI, I'm working on Ubuntu 10.10, with Python 2.6 and QGIS 1.6 (from the
packages).

Thanks for your help,

Cheers,

Mathieu
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