def exportVectorLayer(layer, supported=None):
"""Takes a QgsVectorLayer and returns the filename to refer to it,
which allows external apps which support only file-based layers to
use it. It performs the necessary export in case the input layer
is not in a standard format suitable for most applications, it is
a remote one or db-based (non-file based) one, or if there is a
selection and it should be used, exporting just the selected
features.
Currently, the output is restricted to shapefiles, so anything
that is not in a shapefile will get exported. It also export to
a new file if the original one contains non-ascii characters.
"""
supported = supported or ["shp"]
settings = QSettings()
systemEncoding = settings.value('/UI/encoding', 'System')
output = getTempFilename('shp')
basename = removeInvalidChars(os.path.basename(layer.source()))
if basename:
if not basename.endswith("shp"):
basename = basename + ".shp"
output = getTempFilenameInTempFolder(basename)
else:
output = getTempFilename("shp")
provider = layer.dataProvider()
useSelection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
if useSelection and layer.selectedFeatureCount() != 0:
writer = QgsVectorFileWriter(output, systemEncoding,
layer.fields(),
layer.wkbType(), layer.crs())
selection = layer.selectedFeatures()
for feat in selection:
writer.addFeature(feat)
del writer
return output
else:
isASCII = True
try:
str(layer.source()).decode('ascii')
except UnicodeEncodeError:
isASCII = False
if not os.path.splitext(layer.source())[1].lower() in supported or not isASCII:
writer = QgsVectorFileWriter(
output, systemEncoding,
layer.fields(), layer.wkbType(),
layer.crs()
)
for feat in layer.getFeatures():
writer.addFeature(feat)
del writer
return output
else:
return str(layer.source())
def exportVectorLayer(layer, supported=None):
"""Takes a QgsVectorLayer and returns the filename to refer to it,
which allows external apps which support only file-based layers to
use it. It performs the necessary export in case the input layer
is not in a standard format suitable for most applications, it is
a remote one or db-based (non-file based) one, or if there is a
selection and it should be used, exporting just the selected
features.
Currently, the output is restricted to shapefiles, so anything
that is not in a shapefile will get exported. It also export to
a new file if the original one contains non-ascii characters.
"""
supported = supported or ["shp"]
settings = QSettings()
systemEncoding = settings.value('/UI/encoding', 'System')
output = getTempFilename('shp')
basename = removeInvalidChars(os.path.basename(layer.source()))
if basename:
if not basename.endswith("shp"):
basename = basename + ".shp"
output = getTempFilenameInTempFolder(basename)
else:
output = getTempFilename("shp")
provider = layer.dataProvider()
useSelection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
if useSelection and layer.selectedFeatureCount() != 0:
writer = QgsVectorFileWriter(output, systemEncoding,
layer.fields(),
layer.wkbType(), layer.crs())
selection = layer.selectedFeatures()
for feat in selection:
writer.addFeature(feat)
del writer
return output
else:
isASCII = True
try:
str(layer.source())
except UnicodeEncodeError:
isASCII = False
if not os.path.splitext(layer.source())[1].lower() in supported or not isASCII:
writer = QgsVectorFileWriter(
output, systemEncoding,
layer.fields(), layer.wkbType(),
layer.crs()
)
for feat in layer.getFeatures():
writer.addFeature(feat)
del writer
return output
else:
return str(layer.source())