def test_client_Client_unions(self):
# read the structure
result = self.client.read( [self.address_union] )
self.assertTrue( isinstance(result.targets[0].data, ExtensionObject) )
extensionObject = result.targets[0].data
result = self.client.read( [self.address_union] , attributeId = attributeids.DataType)
dataTypeId = result.targets[0].data
self.assertEqual( dataTypeId.identifier().idNumeric, 543213)
# using the datatypeId, get the definition of the structure
definition = self.client.structureDefinition(dataTypeId)
self.assertEqual( definition.isUnion(), True )
self.assertEqual( definition.child(0).name(), 'Temperature' )
self.assertEqual( definition.child(0).valueType(), opcuatypes.Float )
# using the original ExtensionObject the StructureDefinition, we can now create the union value:
union = GenericUnionValue(extensionObject, definition)
# verify the union
switchValue = union.switchValue()
field = union.field()
self.assertEquals(switchValue, 1)
# now change the active value
union.setValue(union.field().name(), primitives.Float(111.222))
# write back the union
newExtensionObject = ExtensionObject()
union.toExtensionObject(newExtensionObject)
result = self.client.write( [self.address_union], [newExtensionObject] )
self.assertTrue( result.overallStatus.isGood() )
result = self.client.read( [self.address_union] )
extensionObject = result.targets[0].data
union = GenericUnionValue(extensionObject, definition)
self.assertEquals(union.value(), primitives.Float(111.222))
assert type(result.targets[0].data) == ExtensionObject
extensionObject = result.targets[0].data
# now let's find out the datatype of the ExtensionObject
result = myClient.read( [address] , attributeId = attributeids.DataType)
dataTypeId = result.targets[0].data # data represents a NodeId
# using the datatypeId, get the definition of the structure
definition = myClient.structureDefinition(dataTypeId)
print("The definition of the union:")
print(str(definition))
print("")
# we can now create the union:
union = GenericUnionValue(extensionObject, definition)
# print the union:
print("So we can now print the full union:")
printUnion(union)
# now change the active value
union.setValue(union.field().name(), primitives.Float(111.222))
# write back the union
newExtensionObject = ExtensionObject()
union.toExtensionObject(newExtensionObject)
print("Now writing union['%s'] = 111.222333" %union.field().name())
print("")
try:
assert type(result.targets[0].data) == ExtensionObject
extensionObject = result.targets[0].data
# now let's find out the datatype of the ExtensionObject
result = myClient.read([address], attributeId=attributeids.DataType)
dataTypeId = result.targets[0].data # data represents a NodeId
# using the datatypeId, get the definition of the structure
definition = myClient.structureDefinition(dataTypeId)
print("The definition of the union:")
print(str(definition))
print("")
# we can now create the union:
union = GenericUnionValue(extensionObject, definition)
# print the union:
print("So we can now print the full union:")
printUnion(union)
# now change the active value
union.setValue(union.field().name(), primitives.Float(111.222))
# write back the union
newExtensionObject = ExtensionObject()
union.toExtensionObject(newExtensionObject)
print("Now writing union['%s'] = 111.222333" % union.field().name())
print("")
try:
