PyQGis iface.activeLayer return empty?

[المشرف العام]

it is my second day on PyQGIS. Not sure why layer doesn't return anything. Anyone can help me on this?

Code:

#!/usr/bin/pythonfrom qgis.core import *from qgis.utils import *from PyQt4.QtCore import *def main(): qgis_prefix="/usr" QgsApplication.setPrefixPath(qgis_prefix, True) QgsApplication.initQgis() app = QgsApplication([], False) uri = "elevp.csv?delimiter=%s&xField=%s&yField=%s&elevField=%s" % (";","x","y","elev") vlayer = QgsVectorLayer(uri, "test", "delimitedtext") QgsMapLayerRegistry.instance().addMapLayer(vlayer) #print(QgsMapLayerRegistry.instance().mapLayers()) #iface.mapCanvas().setSelectionColor( QColor("red") ) layer = iface.activeLayer() print(layer)# Run main wrapper codesmain()

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