本文整理汇总了Python中qgis.core.QgsFields.lookupField方法的典型用法代码示例。如果您正苦于以下问题：Python QgsFields.lookupField方法的具体用法？Python QgsFields.lookupField怎么用？Python QgsFields.lookupField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.QgsFields的用法示例。
在下文中一共展示了QgsFields.lookupField方法的1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: processAlgorithm
# 需要导入模块: from qgis.core import QgsFields [as 别名]
# 或者: from qgis.core.QgsFields import lookupField [as 别名]
def processAlgorithm(self, parameters, context, feedback):
input_layers = self.parameterAsLayerList(parameters, self.LAYERS, context)
layers = []
fields = QgsFields()
totalFeatureCount = 0
for layer in input_layers:
if layer.type() != QgsMapLayer.VectorLayer:
raise GeoAlgorithmExecutionException(
self.tr('All layers must be vector layers!'))
if (len(layers) > 0):
if (layer.wkbType() != layers[0].wkbType()):
raise GeoAlgorithmExecutionException(
self.tr('All layers must have same geometry type!'))
layers.append(layer)
totalFeatureCount += layer.featureCount()
for sindex, sfield in enumerate(layer.fields()):
found = None
for dfield in fields:
if (dfield.name().upper() == sfield.name().upper()):
found = dfield
if (dfield.type() != sfield.type()):
raise GeoAlgorithmExecutionException(
self.tr('{} field in layer {} has different '
'data type than in other layers.'.format(sfield.name(), layerSource)))
if not found:
fields.append(sfield)
add_layer_field = False
if fields.lookupField('layer') < 0:
fields.append(QgsField('layer', QVariant.String, '', 100))
add_layer_field = True
add_path_field = False
if fields.lookupField('path') < 0:
fields.append(QgsField('path', QVariant.String, '', 200))
add_path_field = True
total = 100.0 / totalFeatureCount if totalFeatureCount else 1
dest_crs = layers[0].crs()
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, layers[0].wkbType(), dest_crs)
featureCount = 0
for layer in layers:
for feature in layer.getFeatures(QgsFeatureRequest().setDestinationCrs(dest_crs)):
if feedback.isCanceled():
break
sattributes = feature.attributes()
dattributes = []
for dindex, dfield in enumerate(fields):
if add_layer_field and dfield.name() == 'layer':
dattributes.append(layer.name())
continue
if add_path_field and dfield.name() == 'path':
dattributes.append(layer.publicSource())
continue
if (dfield.type() == QVariant.Int, QVariant.UInt, QVariant.LongLong, QVariant.ULongLong):
dattribute = 0
elif (dfield.type() == QVariant.Double):
dattribute = 0.0
else:
dattribute = ''
for sindex, sfield in enumerate(layer.fields()):
if (sfield.name().upper() == dfield.name().upper()):
if (sfield.type() != dfield.type()):
raise GeoAlgorithmExecutionException(
self.tr('Attribute type mismatch'))
dattribute = sattributes[sindex]
break
dattributes.append(dattribute)
feature.setAttributes(dattributes)
sink.addFeature(feature, QgsFeatureSink.FastInsert)
featureCount += 1
feedback.setProgress(int(featureCount * total))
return {self.OUTPUT: dest_id}