In a plugin I want to save the selected features in a new shapefile. I search and I try (How can I create a new layer from the currrent selection? to create a new layer and write the selected fields and features in that:

    vl = QgsVectorLayer("Polygon", "temporary_points", "memory")
    pr = vl.dataProvider()

    # add geometry and fields

But this result is not what I wanted. I get this: enter image description here

In this image, the selected polygon is yellow and the pink polygon is the saved one as another shapefile. So the geometry is not completely correct and I need the perfect copy of the original.

Anyone knows how to get it?

I can use the algorithm from Processing Toolbox, "Save selected features".

  • How about the "Save as" option?? You can select your features and then right click, you choose Save as>-Save only selected features. – geo_dd Nov 16 '15 at 17:24
  • Yes, I know that but I want in Python code. – Bárbara Duarte Nov 16 '15 at 17:38
  • I get it. Ii can use the algorithm in processing toolbox, "Save selected features". Thanks anyway. I will edit the question. – Bárbara Duarte Nov 16 '15 at 17:39
  • Did you search on GIS SE ? (How can I create a new layer from the currrent selection?, ...) – gene Nov 16 '15 at 17:46
  • yes, that's what I did in the first place and get the result presented in image. – Bárbara Duarte Nov 17 '15 at 10:01

You can save selected features from your active layer into a Shapefile simply calling QgsVectorFileWriter.writeAsVectorFormat and passing the onlySelected parameter as True:

layer = iface.activeLayer()
res = QgsVectorFileWriter.writeAsVectorFormat( layer,
                                               None, #crs
                                               'ESRI Shapefile',
                                               True #onlySelected
if res != QgsVectorFileWriter.NoError:
    print 'Error number:', res
    print "Done!"

The resulting layer will contain all fields from source layer.

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