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I am writing a script to validate a shapefile.

Here my code:

#-*- coding: UTF-8 -*- import os from osgeo import ogr from PyQt4.QtGui import * from qgis.core import * import sys app = QApplication([]) QgsApplication.setPrefixPath("/usr/", True) # Adjust prefix path according to your installation (see note below) QgsApplication.initQgis() class validacaoVetorialMCV(QgsVectorLayer): """docstring for Arquivo""" def __init__(self, arquivo_shp): self.arquivo_shp = arquivo_shp def campo_not_null(self, arquivo_shp): #Fields to check for value in ('geometriaA', 'regime', 'tipoTrecho', 'tipoMassaD', 'tipoLocali', 'jurisdicao', 'administra', 'nivel_1', 'nivel_2', 'nivel_3'): idx = arquivo_shp.fieldNameIndex(value); values = arquivo_shp.uniqueValues(idx); if all(x for x in values) == False: return 'Registros nulos em %s do: %s' (value, %arquivo_shp.name()); #rootdir = raw_input('Caminho da pasta:') rootdir = '/home/infra/PycharmProjects/untitled/projeto_desenvolvimento_script/folha_mi_1584_2' extensions = ('.shp') for subdir, dirs, files in os.walk(rootdir): for file in files: ext = os.path.splitext(file)[-1].lower() #Print all files which have .shp extension if ext in extensions: #print os.path.join(subdir, file) layer = QgsVectorLayer(os.path.join(rootdir, file), file, "ogr") #Check if layer was setting print layer.name() if not layer.isValid(): print "Layer failed to load!" print validacaoVetorialMCV(layer).validar_normalizacao_campo(layer)

Why does my method "campo_not_null" not work? Why did my layer failed to load? Why were other extensions that are not .shp (.gdb, timestamp) read?

Answer in python console:

mi_1584_2_cerrado.shp Layer failed to load! [] mi_1584_2_localidade.shp Layer failed to load! [] mi_1584_2_massa_dagua.shp Layer failed to load! [] mi_1584_2_trecho_massa_dagua.shp Layer failed to load! [] mi_1584_2_trecho_drenagem.shp Layer failed to load! [] mi_1584_2_trecho_rodoviario.shp Layer failed to load! [] timestamps Layer failed to load! [] gdb Layer failed to load! []
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    Why use pyqgis from outside for that ? There are many other pure Python modules without QGIS. Commented Nov 16, 2016 at 16:21
  • Yes, you are right. I began to write this script with pyqgis. So I continued. I thought to learn more about Qgis API. Commented Nov 16, 2016 at 17:32

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I thought to learn more about Qgis API.

Why not use directly the Python console ?

for subdir, dirs, files in os.walk(rootdir): for file in files: if file.endswith(".shp"): layer = QgsVectorLayer(os.path.join(rootdir, file), os.path.splitext(file)[0], "ogr") layer.isValid()

Works, but if you have subdirectories in rootdir, the layers in the subdirectories are not valid, because of the path os.path.join(rootdir, file)

The solution is to use os.path.join(subdir, file)

class validacaoVetorialMCV(QgsVectorLayer): """docstring for Arquivo""" def __init__(self, arquivo_shp): self.arquivo_shp = arquivo_shp def campo_not_null(self): for value in ('IDENT','NUM'): idx = self.arquivo_shp.fieldNameIndex(value) values = self.arquivo_shp.uniqueValues(idx) if all(x for x in values) == False: return (value,layer.name()) for subdir, dirs, files in os.walk(rootdir): for file in files: if file.endswith(".shp"): layer = QgsVectorLayer( os.path.join(subdir, file), os.path.splitext(file)[0], "ogr") if layer.isValid(): print validacaoVetorialMCV(layer).campo_not_null()
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