def test_client_Client_structures(self):
# read the structure
result = self.client.read( [self.address_vector] )
self.assertTrue( isinstance(result.targets[0].data, ExtensionObject) )
extensionObject = result.targets[0].data
result = self.client.read( [self.address_vector] , attributeId = attributeids.DataType)
dataTypeId = result.targets[0].data
self.assertEqual( dataTypeId.identifier().idNumeric, 3002 )
# using the datatypeId, get the definition of the structure
definition = self.client.structureDefinition(dataTypeId)
self.assertEqual( definition.isUnion(), False )
self.assertEqual( definition.child(0).name(), 'X' )
self.assertEqual( definition.child(1).valueType(), opcuatypes.Double )
# using the original ExtensionObject the StructureDefinition, we can now create the GenericStructureValue:
structureValue = GenericStructureValue(extensionObject, definition)
# verify the structure:
fieldType, opcUaStatusCode = structureValue.valueType(0)
self.assertEqual( fieldType, structurefielddatatypes.Variant )
value, statuscode = structureValue.value(0)
self.assertTrue( isinstance(value, primitives.Double ) )
self.assertEquals(statuscode, 0)
# now change the value of the first child (i = 0):
structureValue.setField(0, primitives.Double(0.1) )
# write back the structure
newExtensionObject = ExtensionObject()
structureValue.toExtensionObject(newExtensionObject)
result = self.client.write( [self.address_vector], [newExtensionObject] )
self.assertTrue( result.overallStatus.isGood() )
result = self.client.read( [self.address_vector] )
extensionObject = result.targets[0].data
structureValue = GenericStructureValue(extensionObject, definition)
value, statuscode = structureValue.value(0)
self.assertEqual( value, primitives.Double(0.1) )
self.assertEqual( statuscode, 0 )
# using the original ExtensionObject the StructureDefinition, we can now create the GenericStructureValue:
structureValue = GenericStructureValue(extensionObject, definition)
# print the structure:
print("So we can now print the full structure:")
printStructure(structureValue)
# now change the value of the first child (i = 0):
structureValue.setField(0, primitives.Double(0.1))
# we can also change a field via its name:
structureValue.setField("Y", primitives.Double(0.2))
# write back the structure
newExtensionObject = ExtensionObject()
structureValue.toExtensionObject(newExtensionObject)
print("Now writing {structure}.X = 0.1 and {structure}.Y = 0.2")
print("")
try:
result = myClient.write( [address], [newExtensionObject] )
if result.overallStatus.isGood():
print("OK, the new structure value has been written successfully")
else:
print("Oops, some OPC UA problem occurred. Here's the result:\n%s" %result)
except UafError, e:
print("Oops, some error occurred on the client side. Here's the error message: %s" %e)
print("")
print("Let's read the same structure again, to verify that the values have changed:")
result = myClient.read( [address] )
# using the original ExtensionObject the StructureDefinition, we can now create the GenericStructureValue:
structureValue = GenericStructureValue(extensionObject, definition)
# print the structure:
print("So we can now print the full structure:")
printStructure(structureValue)
# now change the value of the first child (i = 0):
structureValue.setField(0, primitives.Double(0.1))
# we can also change a field via its name:
structureValue.setField("Y", primitives.Double(0.2))
# write back the structure
newExtensionObject = ExtensionObject()
structureValue.toExtensionObject(newExtensionObject)
print("Now writing {structure}.X = 0.1 and {structure}.Y = 0.2")
print("")
try:
result = myClient.write([address], [newExtensionObject])
if result.overallStatus.isGood():
print("OK, the new structure value has been written successfully")
else:
print("Oops, some OPC UA problem occurred. Here's the result:\n%s" %
result)
except UafError, e:
print(
"Oops, some error occurred on the client side. Here's the error message: %s"
% e)
