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I'm looking for a solution how to use the OGR/GDAL configure options (--config) in the QGIS Python environment. http://trac.osgeo.org/gdal/wiki/ConfigOptions
Setting special configure options is necessary to load some data correctly (OGR Driver).
QgsVectorLayer(filename, title, "ogr")
One usually sets options in C with CPLSetConfigOption. In python it would be gdal.SetConfigOption(option, value), e.g., gdal.SetConfigOption('PG_USE_COPY', 'YES')
In the C and C++ API you can use
CPLSetConfigOption("GDAL_DATA", "your folder path with gdal-data");
In Qt I use
CPLSetConfigOption("GDAL_DATA", QDir( QCoreApplication::applicationDirPath().append("/gdal-data")).absolutePath().toLocal8Bit() );
As my gdal-data folder is relative to the executable path.
