OPC Studio User's Guide and Reference
Installed Examples - Server Library - UAServerDemoLibrary
// // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. using System; using OpcLabs.EasyOpc.UA.NodeSpace; namespace UAServerDemoLibrary { static public class ConsoleNodes { /// <summary> /// Adds nodes that allow interaction with the console. /// </summary> /// <param name="parentFolder">The folder to which to add the nodes.</param> /// <remarks> /// <para> /// The Console nodes allow OPC UA clients to display data on the OPC UA server's console (if it has such device). /// They are included mainly for the fun of it, to demonstrate the fact that any actions can be tied to the OPC write /// operations. Real OPC servers will not do this.</para> /// </remarks> static public void AddToParent(UAFolder parentFolder) { // Create the Console folder. UAFolder consoleFolder = new UAFolder("Console") { // The Write data variable writes the value to the console. new UADataVariable("Write") .Readable(false) .WriteValueAction((string s) => Console.Write(s)), // The WriteLine data variable writes the value to the console and appends a new line. new UADataVariable("WriteLine") .Readable(false) .WriteValueAction((string s) => Console.WriteLine(s)) }; parentFolder.Add(consoleFolder); } } }
// // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. using System; using OpcLabs.EasyOpc.UA.AddressSpace.Standard; using OpcLabs.EasyOpc.UA.NodeSpace; namespace UAServerDemoLibrary { static public class DataNodes { /// <summary> /// Adds static and dynamic nodes that demonstrate various data types and access levels. /// </summary> /// <param name="parentFolder">The folder to which to add the nodes.</param> static public void AddToParent(UAFolder parentFolder) { // Create Data folder. UAFolder dataFolder = UAFolder.CreateIn(parentFolder, "Data"); // Create read-only data variables of various data types, without adding them to the server first. We store // references to them individually, because we later implement write-only variables that write to these // read-only variables. UADataVariable booleanReadOnlyDataVariable = new UADataVariable("BooleanValue").Writable(false).ValueType<bool>(); UADataVariable byteStringReadOnlyDataVariable = new UADataVariable("ByteStringValue").Writable(false).ValueType<byte[]>(); UADataVariable byteReadOnlyDataVariable = new UADataVariable("ByteValue").Writable(false).ValueType<byte>(); UADataVariable dateTimeReadOnlyDataVariable = new UADataVariable("DateTimeValue").Writable(false).ValueType<DateTime>(); UADataVariable doubleReadOnlyDataVariable = new UADataVariable("DoubleValue").Writable(false).ValueType<double>(); UADataVariable floatReadOnlyDataVariable = new UADataVariable("FloatValue").Writable(false).ValueType<float>(); UADataVariable guidReadOnlyDataVariable = new UADataVariable("GuidValue").Writable(false).ValueType<Guid>(); UADataVariable int16ReadOnlyDataVariable = new UADataVariable("Int16Value").Writable(false).ValueType<short>(); UADataVariable int32ReadOnlyDataVariable = new UADataVariable("Int32Value").Writable(false).ValueType<int>(); UADataVariable int64ReadOnlyDataVariable = new UADataVariable("Int64Value").Writable(false).ValueType<long>(); UADataVariable sByteReadOnlyDataVariable = new UADataVariable("SByteValue").Writable(false).ValueType<sbyte>(); UADataVariable stringReadOnlyDataVariable = new UADataVariable("StringValue").Writable(false).ValueType<string>(); UADataVariable uInt16ReadOnlyDataVariable = new UADataVariable("UInt16Value").Writable(false).ValueType<ushort>(); UADataVariable uInt32ReadOnlyDataVariable = new UADataVariable("UInt32Value").Writable(false).ValueType<uint>(); UADataVariable uInt64ReadOnlyDataVariable = new UADataVariable("UInt64Value").Writable(false).ValueType<ulong>(); UADataVariable variantReadOnlyDataVariable = new UADataVariable("VariantValue").Writable(false); // Create Constant sub-folder under the Data folder. It contains read-only data variables with constant values. dataFolder.Add( new UAFolder("Constant") { new UAFolder("Scalar") { new UADataVariable("BooleanValue").ConstantValue(true), new UADataVariable("ByteStringValue").ConstantValue(new byte[] { 0x57, 0x21, 0x40, 0xfc }), new UADataVariable("ByteValue").ConstantValue((byte)144), new UADataVariable("DateTimeValue").ConstantValue( // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // server, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), new UADataVariable("DoubleValue").ConstantValue(7.75630105797e-011), new UADataVariable("FloatValue").ConstantValue(2.77002e+29f), new UADataVariable("GuidValue").ConstantValue( new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")), new UADataVariable("Int16Value").ConstantValue((short)-30956), new UADataVariable("Int32Value").ConstantValue(276673160), new UADataVariable("Int64Value").ConstantValue(1412096336825367659), new UADataVariable("SByteValue").ConstantValue((sbyte)-113), new UADataVariable("StringValue").ConstantValue("lorem ipsum"), new UADataVariable("UInt16Value").ConstantValue((ushort)64421), new UADataVariable("UInt32Value").ConstantValue(3853116537U), new UADataVariable("UInt64Value").ConstantValue(9431348106520835314UL), new UADataVariable("VariantValue").ConstantValue(529739609) } }); // Create Dynamic sub-folder under the Data folder. It contains data variables with dynamically changing values. dataFolder.Add( new UAFolder("Dynamic") { new UAFolder("Array") { new UADataVariable("BooleanValue").ReadValueFunction(() => NextRandomArray(NextRandomBoolean)), new UADataVariable("ByteStringValue").ReadValueFunction(() => NextRandomArray(NextRandomByteString)), // This is a tricky case. We want array of Byte-s, but that is automatically recognized as scalar // OPC UA ByteString. For a true array of Byte-s, the data type Id and array dimension list must be // specified explicitly. new UADataVariable("ByteValue").ReadValueFunction( dataTypeId: UADataTypeIds.Byte, arrayRank: 1, () => NextRandomArray(NextRandomByte)), new UADataVariable("DateTimeValue").ReadValueFunction(() => NextRandomArray(NextRandomDateTime)), new UADataVariable("DoubleValue").ReadValueFunction(() => NextRandomArray(NextRandomDouble)), new UADataVariable("FloatValue").ReadValueFunction(() => NextRandomArray(NextRandomFloat)), new UADataVariable("GuidValue").ReadValueFunction(() => NextRandomArray(NextRandomGuid)), new UADataVariable("Int16Value").ReadValueFunction(() => NextRandomArray(NextRandomInt16)), new UADataVariable("Int32Value").ReadValueFunction(() => NextRandomArray(NextRandomInt32)), new UADataVariable("Int64Value").ReadValueFunction(() => NextRandomArray(NextRandomInt64)), new UADataVariable("SByteValue").ReadValueFunction(() => NextRandomArray(NextRandomSByte)), new UADataVariable("StringValue").ReadValueFunction(() => NextRandomArray(NextRandomString)), new UADataVariable("UInt16Value").ReadValueFunction(() => NextRandomArray(NextRandomUInt16)), new UADataVariable("UInt32Value").ReadValueFunction(() => NextRandomArray(NextRandomUInt32)), new UADataVariable("UInt64Value").ReadValueFunction(() => NextRandomArray(NextRandomUInt64)), new UADataVariable("VariantValue").ReadValueFunction(() => NextRandomArray(NextRandomVariant)) }, new UAFolder("Scalar") { new UADataVariable("BooleanValue").ReadValueFunction(NextRandomBoolean), new UADataVariable("ByteStringValue").ReadValueFunction(NextRandomByteString), new UADataVariable("ByteValue").ReadValueFunction(NextRandomByte), new UADataVariable("DateTimeValue").ReadValueFunction(NextRandomDateTime), new UADataVariable("DoubleValue").ReadValueFunction(NextRandomDouble), new UADataVariable("FloatValue").ReadValueFunction(NextRandomFloat), new UADataVariable("GuidValue").ReadValueFunction(NextRandomGuid), new UADataVariable("Int16Value").ReadValueFunction(NextRandomInt16), new UADataVariable("Int32Value").ReadValueFunction(NextRandomInt32), new UADataVariable("Int64Value").ReadValueFunction(NextRandomInt64), new UADataVariable("SByteValue").ReadValueFunction(NextRandomSByte), new UADataVariable("StringValue").ReadValueFunction(NextRandomString), new UADataVariable("UInt16Value").ReadValueFunction(NextRandomUInt16), new UADataVariable("UInt32Value").ReadValueFunction(NextRandomUInt32), new UADataVariable("UInt64Value").ReadValueFunction(NextRandomUInt64), new UADataVariable("VariantValue").ReadValueFunction(NextRandomVariant) } }); // The FullyWritable sub-folder contains data variables that have not only writable value, but also writable // source timestamp and status code. dataFolder.Add( new UAFolder("FullyWritable") { new UAFolder("Scalar") { new UADataVariable("BooleanValue").ReadWriteValue(true) .Writable(true, true, true), new UADataVariable("ByteStringValue").ReadWriteValue(new byte[] { 0x57, 0x21, 0x40, 0xfc }) .Writable(true, true, true), new UADataVariable("ByteValue").ReadWriteValue((byte)144) .Writable(true, true, true), new UADataVariable("DateTimeValue").ReadWriteValue( // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // server, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)) .Writable(true, true, true), new UADataVariable("DoubleValue").ReadWriteValue(7.75630105797e-011) .Writable(true, true, true), new UADataVariable("FloatValue").ReadWriteValue(2.77002e+29f) .Writable(true, true, true), new UADataVariable("GuidValue") .ReadWriteValue(new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")) .Writable(true, true, true), new UADataVariable("Int16Value").ReadWriteValue((short)-30956) .Writable(true, true, true), new UADataVariable("Int32Value").ReadWriteValue(276673160) .Writable(true, true, true), new UADataVariable("Int64Value").ReadWriteValue(1412096336825367659) .Writable(true, true, true), new UADataVariable("SByteValue").ReadWriteValue((sbyte)-113) .Writable(true, true, true), new UADataVariable("StringValue").ReadWriteValue("lorem ipsum") .Writable(true, true, true), new UADataVariable("UInt16Value").ReadWriteValue((ushort)64421) .Writable(true, true, true), new UADataVariable("UInt32Value").ReadWriteValue(3853116537U) .Writable(true, true, true), new UADataVariable("UInt64Value").ReadWriteValue(9431348106520835314UL) .Writable(true, true, true), new UADataVariable("VariantValue").ReadWriteValue(529739609) .Writable(true, true, true) } }); // The ReadOnly sub-folder contains data variables that are read-only, and their values can be changed through // corresponding data variables in the WriteOnly sub-folder. dataFolder.Add( new UAFolder("ReadOnly") { new UAFolder("Scalar") { booleanReadOnlyDataVariable, byteStringReadOnlyDataVariable, byteReadOnlyDataVariable, dateTimeReadOnlyDataVariable, doubleReadOnlyDataVariable, floatReadOnlyDataVariable, guidReadOnlyDataVariable, int16ReadOnlyDataVariable, int32ReadOnlyDataVariable, int64ReadOnlyDataVariable, sByteReadOnlyDataVariable, stringReadOnlyDataVariable, uInt16ReadOnlyDataVariable, uInt32ReadOnlyDataVariable, uInt64ReadOnlyDataVariable, variantReadOnlyDataVariable } }); // The Static sub-folder contains data variables with static values which can be changed through writing to // them (so-called "registers"). dataFolder.Add( new UAFolder("Static") { // For demonstration, we consistently create one-dimensional arrays with initially 3 elements, where the // first element has the same value as the scalar variable with the same name. new UAFolder("Array") { new UADataVariable("BooleanValue").ReadWriteValue(new[] { true, false, true }), new UADataVariable("ByteStringValue").ReadWriteValue(new[] { new byte[] { 0x57, 0x21, 0x40, 0xfc }, new byte[] { 248, 131, 217, 210 }, new byte[] { 252, 152, 119, 65 } }), // This is a tricky case. We want array of Byte-s, but that is automatically recognized as scalar // OPC UA ByteString. For a true array of Byte-s, the data type Id and array dimension list must be // specified explicitly. new UADataVariable("ByteValue").ReadWriteValue( dataTypeId: UADataTypeIds.Byte, arrayRank: 1, value: new byte[] { 144, 19, 233 }), new UADataVariable("DateTimeValue").ReadWriteValue(new[] { // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // server, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc), DateTime.SpecifyKind(new DateTime(2024, 4, 8), DateTimeKind.Utc), DateTime.SpecifyKind(new DateTime(2023, 8, 14, 18, 13, 0), DateTimeKind.Utc) }), new UADataVariable("DoubleValue").ReadWriteValue(new[] { 7.75630105797e-011, -0.467227097818268, -3.51653052582609E+300 }), new UADataVariable("FloatValue").ReadWriteValue(new[] { 2.77002e+29f, -1.103936E+36f, -9.002293E-28f }), new UADataVariable("GuidValue").ReadWriteValue(new[] { new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}"), new Guid("{E8690EA3-25D0-4F19-9DFC-AA25D2772B2F}"), new Guid("{9E081C84-7953-4A88-B709-447FC187EDD9}"), }), new UADataVariable("Int16Value").ReadWriteValue(new short[] { -30956, 31277, 21977 }), new UADataVariable("Int32Value").ReadWriteValue(new[] { 276673160, 630080334, -391755284 }), new UADataVariable("Int64Value").ReadWriteValue(new[] { 1412096336825367659, -808781653700434592, 4707848393174903135 }), new UADataVariable("SByteValue").ReadWriteValue(new sbyte[] { -113, -92, 2 }), new UADataVariable("StringValue").ReadWriteValue(new[] { "lorem ipsum", "dolor sit amet", "consectetur adipiscing elit" }), new UADataVariable("UInt16Value").ReadWriteValue(new ushort[] { 64421, 22663, 36755 }), new UADataVariable("UInt32Value").ReadWriteValue(new uint[] { 3853116537, 968679231, 995611904 }), new UADataVariable("UInt64Value").ReadWriteValue(new ulong[] { 9431348106520835314, 15635738044048254300, 946287779964705249 }), new UADataVariable("VariantValue").ReadWriteValue(new object[] { 529739609, "lorem ipsum", new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}") }) }, // We create 2-dimensional arrays with 4x3 size, and default element values. new UAFolder("Array2D") { new UADataVariable("BooleanValue").ReadWriteValue(new bool[4, 3]), new UADataVariable("ByteStringValue").ReadWriteValue(new byte[4, 3][]), new UADataVariable("ByteValue").ReadWriteValue(new byte[4, 3]), new UADataVariable("DateTimeValue").ReadWriteValue(new DateTime[4, 3]), new UADataVariable("DoubleValue").ReadWriteValue(new double[4, 3]), new UADataVariable("FloatValue").ReadWriteValue(new float[4, 3]), new UADataVariable("GuidValue").ReadWriteValue(new Guid[4, 3]), new UADataVariable("Int16Value").ReadWriteValue(new short[4, 3]), new UADataVariable("Int32Value").ReadWriteValue(new int[4, 3]), new UADataVariable("Int64Value").ReadWriteValue(new long[4, 3]), new UADataVariable("SByteValue").ReadWriteValue(new sbyte[4, 3]), new UADataVariable("StringValue").ReadWriteValue(new string[4, 3]), new UADataVariable("UInt16Value").ReadWriteValue(new ushort[4, 3]), new UADataVariable("UInt32Value").ReadWriteValue(new uint[4, 3]), new UADataVariable("UInt64Value").ReadWriteValue(new ulong[4, 3]), new UADataVariable("VariantValue").ReadWriteValue(new object[4, 3]) }, // Array nodes with specified and enforced maximum array dimensions. new UAFolder("BoundedArray") { new UADataVariable("BooleanValue").ReadWriteValue(new bool[4], arrayDimensions: 5), new UADataVariable("ByteStringValue").ReadWriteValue(new byte[4][], arrayDimensions: 5), // This is a tricky case. We want array of Byte-s, but that is automatically recognized as scalar // OPC UA ByteString. For a true array of Byte-s, the data type Id and array dimension list must be // specified explicitly. new UADataVariable("ByteValue").ReadWriteValue( dataTypeId: UADataTypeIds.Byte, arrayDimensionList: new[] { 5 }, new byte[4]), new UADataVariable("DateTimeValue").ReadWriteValue(new DateTime[4], arrayDimensions: 5), new UADataVariable("DoubleValue").ReadWriteValue(new double[4], arrayDimensions: 5), new UADataVariable("FloatValue").ReadWriteValue(new float[4], arrayDimensions: 5), new UADataVariable("GuidValue").ReadWriteValue(new Guid[4], arrayDimensions: 5), new UADataVariable("Int16Value").ReadWriteValue(new short[4], arrayDimensions: 5), new UADataVariable("Int32Value").ReadWriteValue(new int[4], arrayDimensions: 5), new UADataVariable("Int64Value").ReadWriteValue(new long[4], arrayDimensions: 5), new UADataVariable("SByteValue").ReadWriteValue(new sbyte[4], arrayDimensions: 5), new UADataVariable("StringValue").ReadWriteValue(new string[4], arrayDimensions: 5), new UADataVariable("UInt16Value").ReadWriteValue(new ushort[4], arrayDimensions: 5), new UADataVariable("UInt32Value").ReadWriteValue(new uint[4], arrayDimensions: 5), new UADataVariable("UInt64Value").ReadWriteValue(new ulong[4], arrayDimensions: 5), new UADataVariable("VariantValue").ReadWriteValue(new object[4], arrayDimensions: 5) }, new UAFolder("Scalar") { new UADataVariable("BooleanValue").ReadWriteValue(true), new UADataVariable("ByteStringValue").ReadWriteValue(new byte[] { 0x57, 0x21, 0x40, 0xfc }), new UADataVariable("ByteValue").ReadWriteValue((byte)144), new UADataVariable("DateTimeValue").ReadWriteValue( // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // server, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), new UADataVariable("DoubleValue").ReadWriteValue(7.75630105797e-011), new UADataVariable("FloatValue").ReadWriteValue(2.77002e+29f), new UADataVariable("GuidValue").ReadWriteValue( new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")), new UADataVariable("Int16Value").ReadWriteValue((short)-30956), new UADataVariable("Int32Value").ReadWriteValue(276673160), new UADataVariable("Int64Value").ReadWriteValue(1412096336825367659), new UADataVariable("SByteValue").ReadWriteValue((sbyte)-113), new UADataVariable("StringValue").ReadWriteValue("lorem ipsum"), new UADataVariable("UInt16Value").ReadWriteValue((ushort)64421), new UADataVariable("UInt32Value").ReadWriteValue(3853116537U), new UADataVariable("UInt64Value").ReadWriteValue(9431348106520835314UL), new UADataVariable("VariantValue").ReadWriteValue(529739609) } }); // Create and add write-only data variables of various data types. Implement write actions that write the value // to the corresponding read-only data variable of the same data type. dataFolder.Add( new UAFolder("WriteOnly") { new UAFolder("Scalar") { new UADataVariable("BooleanValue").Readable(false).WriteValueAction((bool value) => booleanReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("ByteStringValue").Readable(false).WriteValueAction((byte[] value) => byteStringReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("ByteValue").Readable(false).WriteValueAction((byte value) => byteReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("DateTimeValue").Readable(false).WriteValueAction((DateTime value) => dateTimeReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("DoubleValue").Readable(false).WriteValueAction((double value) => doubleReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("FloatValue").Readable(false).WriteValueAction((float value) => floatReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("GuidValue").Readable(false).WriteValueAction((Guid value) => guidReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("Int16Value").Readable(false).WriteValueAction((short value) => int16ReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("Int32Value").Readable(false).WriteValueAction((int value) => int32ReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("Int64Value").Readable(false).WriteValueAction((long value) => int64ReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("SByteValue").Readable(false).WriteValueAction((sbyte value) => sByteReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("StringValue").Readable(false).WriteValueAction((string value) => stringReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("UInt16Value").Readable(false).WriteValueAction((ushort value) => uInt16ReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("UInt32Value").Readable(false).WriteValueAction((uint value) => uInt32ReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("UInt64Value").Readable(false).WriteValueAction((ulong value) => uInt64ReadOnlyDataVariable.UpdateReadAttributeData(value)), new UADataVariable("VariantValue").Readable(false).WriteValueAction((object value) => variantReadOnlyDataVariable.UpdateReadAttributeData(value)) } }); } // Random value generators. static private readonly Random Random = new Random(); static private readonly string[] RandomStrings = new[] { "lorem", "ipsum", "dolor", "sit", "amet" }; static private T[] NextRandomArray<T>(Func<T> nextRandomElement) => new[] { nextRandomElement(), nextRandomElement(), nextRandomElement() }; static private bool NextRandomBoolean() => Random.Next(2) != 0; static private byte NextRandomByte() => (byte)Random.Next(byte.MinValue, byte.MaxValue + 1); static private byte[] NextRandomByteString() => new[] { NextRandomByte(), NextRandomByte(), NextRandomByte(), NextRandomByte() }; static private DateTime NextRandomDateTime() => DateTime.MinValue.AddMilliseconds((DateTime.MaxValue - DateTime.MinValue).TotalMilliseconds * Random.NextDouble()); static private float NextRandomFloat() => (float)Math.Pow(10, Math.Log10(float.MaxValue) * Random.NextDouble()) * (2 * Random.Next(2) - 1); static private double NextRandomDouble() => Math.Pow(10, Math.Log10(double.MaxValue) * Random.NextDouble()) * (2 * Random.Next(2) - 1); static private Guid NextRandomGuid() => Guid.NewGuid(); static private short NextRandomInt16() => (short)Random.Next(short.MinValue, short.MaxValue + 1); static private int NextRandomInt32() { byte[] buffer = new byte[4]; Random.NextBytes(buffer); return BitConverter.ToInt32(buffer, 0); } static private long NextRandomInt64() { byte[] buffer = new byte[8]; Random.NextBytes(buffer); return BitConverter.ToInt64(buffer, 0); } static private sbyte NextRandomSByte() => (sbyte)Random.Next(sbyte.MinValue, sbyte.MaxValue + 1); static private string NextRandomString() => RandomStrings[Random.Next(RandomStrings.Length)]; static private ushort NextRandomUInt16() => (ushort)Random.Next(ushort.MinValue, ushort.MaxValue + 1); static private uint NextRandomUInt32() { byte[] buffer = new byte[4]; Random.NextBytes(buffer); return BitConverter.ToUInt32(buffer, 0); } static private ulong NextRandomUInt64() { byte[] buffer = new byte[8]; Random.NextBytes(buffer); return BitConverter.ToUInt64(buffer, 0); } static private object NextRandomVariant() { switch (Random.Next(15)) { case 0: return NextRandomBoolean(); case 1: return NextRandomByteString(); case 2: return NextRandomByte(); case 3: return NextRandomDateTime(); case 4: return NextRandomDouble(); case 5: return NextRandomFloat(); case 6: return NextRandomGuid(); case 7: return NextRandomInt16(); case 8: return NextRandomInt32(); case 9: return NextRandomInt64(); case 10: return NextRandomSByte(); case 11: return NextRandomString(); case 12: return NextRandomUInt16(); case 13: return NextRandomUInt32(); case 14: return NextRandomUInt64(); default: return null; } } } }
// // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. using OpcLabs.EasyOpc.UA.NodeSpace; using System; using OpcLabs.EasyOpc.UA; using OpcLabs.EasyOpc.UA.Generic; namespace UAServerDemoLibrary { static public class DemoNodes { /// <summary> /// Adds nodes that demonstrate various features of the OPC Wizard. /// </summary> /// <param name="parentFolder">The folder to which to add the nodes.</param> static public void AddToParent(UAFolder parentFolder) { // Demonstrate that in the simplest case, the data variable can be added directly to the Objects folder. parentFolder.Add(new UADataVariable("Simple").ReadWriteValue(0)); // Demonstrate the fact that nodes can be organized in folders, and that data variables can be nested. UAFolder demoFolder = UAFolder.CreateIn(parentFolder, "Demo"); // Create an empty data variable. demoFolder.Add(new UADataVariable("Empty")); // Demonstrate that the data variables can be nested. demoFolder.Add( new UADataVariable("Random") { new UADataVariable("Nested").ReadValueFunction(() => Random.NextDouble()) }.ReadValueFunction(() => Random.NextDouble())); // Demonstrate that the data values returned can also contain status codes that are not fully "Good". demoFolder.Add(new UADataVariable("GoodLocalOverride").ReadWrite(new UAAttributeData<int>( value: 0, UACodeBits.GoodLocalOverride, DateTime.UtcNow))); demoFolder.Add(new UADataVariable("BadNoCommunication").ReadWrite(new UAAttributeData<int>( value: 0, UACodeBits.BadNoCommunication, DateTime.UtcNow))); demoFolder.Add(new UADataVariable("Unreliable").ReadFunction(() => new UAAttributeData<int>( value: 42, (Random.Next(2) != 0) ? UACodeBits.Good : UACodeBits.BadNoCommunication, DateTime.UtcNow))); // Demonstrate that the data variable may decide to fail the write operation. demoFolder.Add(new UADataVariable("WriteFailure").WriteFunction<int>(_ => UACodeBits.BadNoCommunication)); // Depending on the needs, you can specify custom minimum sampling interval for the data variable. demoFolder.Add(new UADataVariable("SlowSampling") .ReadValueFunction(() => Random.Next()) .SetMinimumSamplingInterval(5 * 1000)); // Create a 3-dimensional array data variable. demoFolder.Add(new UADataVariable("Array3D").ReadWriteValue(new int[2, 4, 3])); // A data variable of data type BaseDataType that, in fact, only accepts float values to be written into it. // This is a demonstration of what how the data variable should *not* behave, because the client has no way of // determining the data type that the server expects. var variantRestrictedDataVariable = new UADataVariable("VariantRestricted"); demoFolder.Add(variantRestrictedDataVariable .WriteValueFunction<object>(value => { if (value is float) { variantRestrictedDataVariable.WriteAttributeData.Value = value; return null; } return UACodeBits.BadTypeMismatch; }) .ReadWriteValue((object)0.0f)); } static private readonly Random Random = new Random(); } }
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