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As described in https://www.gaia-gis.it/gaia-sins/spatialite-sql-latest.html the function is used as ST_Line_Interpolate_Point( line Curve , fraction Double precision ) : Point An example that can be tested with SQL command line for example with spatialite-gui. Fraction=0.5 finds the midpoint. SELECT ST_AsText( ST_Line_Interpolate_Point ...


SQL query is wrong, it should be: result = dataSource.ExecuteSQL("select * from roi_classMacro WHERE C_info = 'g19' or C_info = 'g22' or C_info = 'g23'") For attribute filter try: mylayer.SetAttributeFilter("C_info = 'g19' or C_info = 'g22' or C_info = 'g23'")

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