Exporting multiple layers with PyQGIS

Question

Is it possible to export multiple layers using for loop?

I want to export all vector layers added to the map.

The problem I experience is that the second argument has to be a string but it leads to overwriting the same file over and over again

error = QgsVectorFileWriter.writeAsVectorFormatV2(vlayer,"D://exportedlayer.shp",transform_context,save_options)

I tried two things:

1. replacing that string with a variable (layer name)
2. concatenating file path with layer name ans .shp extension

but none works. Any ideas?

Answer 1

Can you try:

layers = [l for l in QgsProject.instance().mapLayers().values() if l.type() == QgsVectorLayer.VectorLayer]
#print(layers)
save_options = QgsVectorFileWriter.SaveVectorOptions()
save_options.driverName = "ESRI Shapefile"
transform_context = QgsCoordinateTransformContext()

for vlayer in layers:
    #print(vlayer.name())
    #print (QgsVectorFileWriter.writeAsVectorFormatV3(vlayer,"D://"+vlayer.name(),transform_context,save_options))
    error, error_string, path, layername = QgsVectorFileWriter.writeAsVectorFormatV3(vlayer,"D://"+vlayer.name(),transform_context,save_options)
    if error != QgsVectorFileWriter.NoError:
        print('Error: {details}'.format(details=error_string))