本文整理汇总了Python中qgis.core.QgsVectorFileWriter.errorMessage方法的典型用法代码示例。如果您正苦于以下问题:Python QgsVectorFileWriter.errorMessage方法的具体用法?Python QgsVectorFileWriter.errorMessage怎么用?Python QgsVectorFileWriter.errorMessage使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsVectorFileWriter
的用法示例。
在下文中一共展示了QgsVectorFileWriter.errorMessage方法的5个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: createShapefile
# 需要导入模块: from qgis.core import QgsVectorFileWriter [as 别名]
# 或者: from qgis.core.QgsVectorFileWriter import errorMessage [as 别名]
def createShapefile(filePath, name, wkbType, crs, fields, styleURI=None, symbology=None):
# WARNING This will overwrite existing files
writer = QgsVectorFileWriter(filePath, 'System', fields, wkbType, crs)
if writer.hasError():
utils.debug(writer.errorMessage())
del writer
layer = QgsVectorLayer(filePath, name, 'ogr')
loadStyle(layer, styleURI, symbology)
return layer
示例2: _toVectorLayer_geojson
# 需要导入模块: from qgis.core import QgsVectorFileWriter [as 别名]
# 或者: from qgis.core.QgsVectorFileWriter import errorMessage [as 别名]
def _toVectorLayer_geojson (self):
crs = QgsCoordinateReferenceSystem()
crs.createFromUserInput(self.provider.srsName)
fileName = self.xmlFile.replace(".xml", ".geojson")
fields = QgsFields ()
map (fields.append, self.provider.fields)
writer = QgsVectorFileWriter (fileName, "utf-8", fields, QGis.WKBPoint, crs, "GeoJSON")
if writer.hasError() != QgsVectorFileWriter.NoError:
raise Exception (writer.errorMessage())
for feature in self.provider.getFeatures():
self.features.append(feature)
writer.addFeature(feature)
del writer #Forzar escritura a disco
return QgsVectorLayer( fileName, self.name, "ogr")
示例3: to_shp
# 需要导入模块: from qgis.core import QgsVectorFileWriter [as 别名]
# 或者: from qgis.core.QgsVectorFileWriter import errorMessage [as 别名]
def to_shp(self, path, name, crs, encoding, geom_type, features, graph='primal'):
if graph == 'primal':
flds = self.edge_qflds
elif graph == 'dual':
flds = [QgsField('source', QVariant.String), QgsField('target', QVariant.String),
QgsField('cost', QVariant.Int)]
if path is None:
network = QgsVectorLayer('MultiLineString?crs=' + crs.toWkt(), name, "memory")
else:
file_writer = QgsVectorFileWriter(path, encoding, flds, geom_type,
crs, "ESRI Shapefile")
if file_writer.hasError() != QgsVectorFileWriter.NoError:
print "Error when creating shapefile: ", file_writer.errorMessage()
del file_writer
network = QgsVectorLayer(path, name, "ogr")
# QgsMapLayerRegistry.instance().addMapLayer(network)
pr = network.dataProvider()
network.startEditing()
if path is None:
pr.addAttributes(flds)
pr.addFeatures(features)
network.commitChanges()
return network
示例4: QgsFields
# 需要导入模块: from qgis.core import QgsVectorFileWriter [as 别名]
# 或者: from qgis.core.QgsVectorFileWriter import errorMessage [as 别名]
# Export a vector layer directly from features
# define fields for feature attributes. A QgsFields object is needed
fields = QgsFields()
fields.append(QgsField("first", QVariant.Int))
fields.append(QgsField("second", QVariant.String))
# Create an instance of vector file writer, which will create the vector file.
# Arguments:
# 1. path to new file (will fail if exists already)
# 2. encoding of the attributes
# 3. field map
# 4. geometry type - from WKBTYPE enum
# 5. layer's spatial reference (instance of
# QgsCoordinateReferenceSystem) - optional
# 6. driver name for the output file
writer = QgsVectorFileWriter("my_shapes.shp", "CP1250", fields,
QGis.WKBPoint, None, "ESRI Shapefile")
if writer.hasError() != QgsVectorFileWriter.NoError:
print("Error when creating shapefile: ", writer.errorMessage())
# Add a feature
fet = QgsFeature()
fet.setGeometry(QgsGeometry.fromPoint(QgsPoint(10, 10)))
fet.setAttributes([1, "text"])
writer.addFeature(fet)
# Delete the writer to flush features to disk
del writer
示例5: _preparePolygonLayer
# 需要导入模块: from qgis.core import QgsVectorFileWriter [as 别名]
# 或者: from qgis.core.QgsVectorFileWriter import errorMessage [as 别名]
def _preparePolygonLayer(self, theQgisLayer):
"""Create a new layer with no intersecting features to self.layer.
A helper function to align the polygons to the postprocLayer
polygons. If one input polygon is in two or more postprocLayer polygons
then it is divided so that each part is within only one of the
postprocLayer polygons. this allows to aggregate in postrocessing using
centroid in polygon.
The function assumes EPSG:4326 but no checks are enforced
Args:
theQgisLayer of the file to be processed
Returns:
QgisLayer of the processed file
Raises:
Any exceptions raised by the InaSAFE library will be propagated.
"""
# import time
# startTime = time.clock()
myMessage = m.Message(
m.Heading(self.tr('Preclipping input data...')),
m.Paragraph(self.tr(
'Modifying %1 to avoid intersections with the aggregation '
'layer'
).arg(theQgisLayer.name())))
self._sendMessage(myMessage)
theLayerFilename = str(theQgisLayer.source())
myPostprocPolygons = self.safeLayer.get_geometry()
myPolygonsLayer = safe_read_layer(theLayerFilename)
myRemainingPolygons = numpy.array(myPolygonsLayer.get_geometry())
# myRemainingAttributes = numpy.array(myPolygonsLayer.get_data())
myRemainingIndexes = numpy.array(range(len(myRemainingPolygons)))
#used for unit tests only
self.preprocessedFeatureCount = 0
# FIXME (MB) the intersecting array is used only for debugging and
# could be safely removed
myIntersectingPolygons = []
myInsidePolygons = []
# FIXME (MB) maybe do raw geos without qgis
#select all postproc polygons with no attributes
aggregationProvider = self.layer.dataProvider()
aggregationProvider.select([])
# copy polygons to a memory layer
myQgisMemoryLayer = create_memory_layer(theQgisLayer)
polygonsProvider = myQgisMemoryLayer.dataProvider()
allPolygonAttrs = polygonsProvider.attributeIndexes()
polygonsProvider.select(allPolygonAttrs)
myQgisPostprocPoly = QgsFeature()
myQgisFeat = QgsFeature()
myInsideFeat = QgsFeature()
fields = polygonsProvider.fields()
myTempdir = temp_dir(sub_dir='preprocess')
myOutFilename = unique_filename(suffix='.shp',
dir=myTempdir)
self.keywordIO.copy_keywords(theQgisLayer, myOutFilename)
mySHPWriter = QgsVectorFileWriter(myOutFilename,
'UTF-8',
fields,
polygonsProvider.geometryType(),
polygonsProvider.crs())
if mySHPWriter.hasError():
raise InvalidParameterError(mySHPWriter.errorMessage())
# end FIXME
for (myPostprocPolygonIndex,
myPostprocPolygon) in enumerate(myPostprocPolygons):
LOGGER.debug('PostprocPolygon %s' % myPostprocPolygonIndex)
myPolygonsCount = len(myRemainingPolygons)
aggregationProvider.featureAtId(
myPostprocPolygonIndex, myQgisPostprocPoly, True, [])
myQgisPostprocGeom = QgsGeometry(myQgisPostprocPoly.geometry())
# myPostprocPolygon bounding box values
A = numpy.array(myPostprocPolygon)
minx = miny = sys.maxint
maxx = maxy = -minx
myPostprocPolygonMinx = min(minx, min(A[:, 0]))
myPostprocPolygonMaxx = max(maxx, max(A[:, 0]))
myPostprocPolygonMiny = min(miny, min(A[:, 1]))
myPostprocPolygonMaxy = max(maxy, max(A[:, 1]))
# create an array full of False to store if a BB vertex is inside
# or outside the myPostprocPolygon
myAreVerticesInside = numpy.zeros(myPolygonsCount * 4,
dtype=numpy.bool)
# Create Nx2 vector of vertices of bounding boxes
myBBVertices = []
# Compute bounding box for each geometry type
for myPoly in myRemainingPolygons:
#.........这里部分代码省略.........