Adding a Tiles/wms? (openStreetMap) layer with python in QGIS

Question

In my QGIS python plugin I want to add a background map (if the user haven't added one), hence I think I missing something in the url for the Tiles/wms service.. (the function returns invalid layer) Any suggestions?

 sources = [layer.source() for layer in QgsProject.instance().mapLayers().values()]
 print(sources)
 source_found = False
 for source in sources:
 if 'xyz&url' in source:
 source_found = True
 print('found')
 if not source_found:
 print('adding')
 urlWithParams = 'type=xyz&url=http://a.tile.openstreetmap.org/%7Bz%7D/%7Bx%7D/%7By%7D.png&zmax=19&zmin=0&crs=EPSG3857'
 rlayer = QgsVectorLayer(urlWithParams, 'OpenStreetMap', 'wms')
 if rlayer.isValid():
 QgsProject.instance().addMapLayer(rlayer)
 else:
 print('invalid layer')

• Ahsan Mukhtar: What version of QGIS, are you using ?
• axel_ande: QGIS3.. (I know how to add it with XYZ Tiles manually)
• Mapperz: python to load xyz tiles raw.githubusercontent.com/klakar/QGIS_resources/master/… > sources.append(["connections-xyz","OpenStreetMap Standard"
• axel_ande: I know, it is a very nice script how to add the tiles to the browser, hence I would like to add it as a layer.

Answer 1

Tiles/WMS sources give you raster data. So, you have to use QgsRasterLayer() instead of QgsVectorLayer().

Try in this way:

...
 rlayer = QgsRasterLayer(urlWithParams, 'OpenStreetMap', 'wms') # EDIT THIS LINE
 if rlayer.isValid():
 QgsProject.instance().addMapLayer(rlayer)
 else:
 print('invalid layer')

• axel_ande: I knew it was an easy fix! Thx