Running a script with QgsFeature from within the console

Question

I am trying to run a script from the QGis Python console (similar to: http://spatialgalaxy.net/2012/01/27/qgis-running-scripts-in-the-python-console/)

The line feat=QgsFeature() operates fine from the Python console, however within the script it throws up the following error:

Traceback (most recent call last): File "", line 1, in File "getLineFeaturesAndPoints.py", line 47, in write_polylines feat = QgsFeature() NameError: global name 'QgsFeature' is not defined

The code is saved in getLineFeaturesAndPoints.py file:

class WritePolylines:
def __init__(self, iface):
 """Initialize using the qgis.utils.iface 
 object passed from the console.
 """
 self.iface = iface
def write_polylines(self, file_dir):
 # Get the active layer
 # qgis.utils.iface.mapCanvas()
 canvas = self.iface.mapCanvas()
 cLayer = canvas.currentLayer()
 #cLayer.name()
 # Get reference to the data provider
 provider = cLayer.dataProvider()
 # get all features (but no geometry)
 provider.select()
 # get attributes
 selectList = []
 columns = provider.fields()
 for key,value in columns.items():
 column = str(value.name())
 selectList.append(provider.fieldNameIndex(column))
 provider.select(selectList)
 features_file = open(path.join(file_dir, "features.txt"), "w")
 points_file = open(path.join(file_dir, "featurepoints.txt"), "w")
 writeFeature = csv.writer(features_file, quoting=csv.QUOTE_ALL)
 writePoint = csv.writer(points_file, quoting=csv.QUOTE_ALL) 
 # get one feature id and geometry
 feat = QgsFeature()

Similar to the referenced HTML file, I invoke it as follows:

from getLineFeaturesAndPoints import WritePolylines 
pl = WritePolylines(qgis.utils.iface)
myPath = 'C:\\Users\\Documents'
pl.write_polylines(myPath)

Answer 1

You are missing:

from qgis.core import QgsFeature

at the top of your script