本文整理汇总了Python中qgis.core.QgsLayerDefinition.loadLayerDefinitionLayers方法的典型用法代码示例。如果您正苦于以下问题：Python QgsLayerDefinition.loadLayerDefinitionLayers方法的具体用法？Python QgsLayerDefinition.loadLayerDefinitionLayers怎么用？Python QgsLayerDefinition.loadLayerDefinitionLayers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.QgsLayerDefinition的用法示例。
在下文中一共展示了QgsLayerDefinition.loadLayerDefinitionLayers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: testSaveFields
# 需要导入模块: from qgis.core import QgsLayerDefinition [as 别名]
# 或者: from qgis.core.QgsLayerDefinition import loadLayerDefinitionLayers [as 别名]
def testSaveFields(self):
# Create a new py layerwith no fields
myPyLayer = QgsVectorLayer(
('Point?crs=epsg:4326&index=yes'),
'test',
'pythonprovider')
# Add some fields to the layer
myFields = [QgsField('TestInt', QVariant.Int, 'integer', 2, 0),
QgsField('TestLong', QVariant.LongLong, 'long', -1, 0),
QgsField('TestDbl', QVariant.Double, 'double', 8, 6),
QgsField('TestString', QVariant.String, 'string', 50, 0),
QgsField('TestDate', QVariant.Date, 'date'),
QgsField('TestTime', QVariant.Time, 'time'),
QgsField('TestDateTime', QVariant.DateTime, 'datetime')]
assert myPyLayer.startEditing()
for f in myFields:
assert myPyLayer.addAttribute(f)
assert myPyLayer.commitChanges()
myPyLayer.updateFields()
# Export the layer to a layer-definition-XML
qlr = QgsLayerDefinition.exportLayerDefinitionLayers([myPyLayer], QgsReadWriteContext())
assert qlr is not None
# Import the layer from the layer-definition-XML
layers = QgsLayerDefinition.loadLayerDefinitionLayers(qlr, QgsReadWriteContext())
assert layers is not None
myImportedLayer = layers[0]
assert myImportedLayer is not None
# Check for the presence of the fields
importedFields = myImportedLayer.fields()
assert importedFields is not None
for f in myFields:
assert f == importedFields.field(f.name())