i am making a qgis plugin and want to highlight a feature from feature id but the feature id must be taken from the textbox my code is below but this shows error like cLayer.setSelectedFeatures(me) TypeError: expected string or buffer

    inputid = self.dlg.lineEdit.text()
    cLayer = self.iface.mapCanvas().currentLayer()
    query = '"ID" = {''}'.format(inputid)
    selection = cLayer.getFeatures(QgsFeatureRequest().setFilterExpression(query))
    me = [k.id() for k in selection]
  • 1
    I believe @mgri is correct in that you will need to select your layer from the Layers Panel to avoid that error. What about using a QgsMapLayerComboBox where the user can select from a list of available layers and then call this layer in your code?
    – Joseph
    Apr 26, 2017 at 10:59

1 Answer 1


It seems that QGIS doesn't recognize the layer.

The line:

cLayer = self.iface.mapCanvas().currentLayer()

returns a QgsVectorLayer() object only if it is currently selected in the Layers Panel. Otherwise, a None is returned and the error you encountered.

I don't know the source of the input layer, but a general method for loading it would be:

cLayer = QgsVectorLayer('path to the vector layer', 'display name', 'ogr')
  • thanks now m getting an error like:- cLayer.setSelectedFeatures(ids) TypeError: expected string or buffer Apr 26, 2017 at 11:25
  • @vaibhavDhiman, as you read from the Tour, comments are used to asking for more information or clarify a question or answer. The error you reported is referred to another issue (and you get a new error because the one from your original question was solved), so the best would be accepting my answer (if it helped you to find a solution) and asking a new separate question where you isolate this new specific error.
    – mgri
    Apr 26, 2017 at 12:39

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