Release S7NetPlus 0.16.0

Release highlights:
- Fix UInt32 reads in classes
- Add string support for classes

.github/workflows/test.yml

@@ -14,14 +14,14 @@ jobs:
       DOTNET_NOLOGO : 1
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest, macos-latest]
+        os: [windows-latest, ubuntu-20.04, macos-latest]
         test-framework: [netcoreapp3.1, net5.0]
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             test-framework: netcoreapp3.1
             installSnap7: true
             dotnet-sdk: '3.1.x'
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             test-framework: net5.0
             installSnap7: true
             dotnet-sdk: '5.0.x'
@@ -48,7 +48,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Install Snap7 Linux
-        if: ${{ matrix.installSnap7 && matrix.os == 'ubuntu-latest' }}
+        if: ${{ matrix.installSnap7 && matrix.os == 'ubuntu-20.04' }}
         run: |
           sudo add-apt-repository ppa:gijzelaar/snap7
           sudo apt-get update

S7.Net.UnitTest/Helpers/TestClass.cs

@@ -1,4 +1,6 @@
 
+using S7.Net.Types;
+
 namespace S7.Net.UnitTest.Helpers
 {
     class TestClass
@@ -51,5 +53,16 @@ namespace S7.Net.UnitTest.Helpers
         /// DB1.DBD16
         /// </summary>
         public ushort DWordVariable { get; set; }
+
+        /// <summary>
+        /// DB1.DBX20.0
+        /// </summary>
+        [S7String(S7StringType.S7WString, 10)]
+        public string WStringVariable { get; set; }
+        /// <summary>
+        /// DB1.DBX44.0
+        /// </summary>
+        [S7String(S7StringType.S7String, 10)]
+        public string StringVariable { get; set; }
     }
 }

S7.Net.UnitTest/S7NetTestsAsync.cs

@@ -7,6 +7,7 @@ using S7.Net.Types;
 using S7.UnitTest.Helpers;
 using System.Threading.Tasks;
 using System.Threading;
+using System.Security.Cryptography;
 
 #endregion
 
@@ -154,7 +155,9 @@ namespace S7.Net.UnitTest
                 IntVariable = -15000,
                 LRealVariable = -154.789,
                 RealVariable = -154.789f,
-                DWordVariable = 850
+                DWordVariable = 850,
+                WStringVariable = "ÄÜÉÊéà",
+                StringVariable = "Hallo"
             };
 
             await plc.WriteClassAsync(tc, DB2);
@@ -168,6 +171,8 @@ namespace S7.Net.UnitTest
             Assert.AreEqual(tc.LRealVariable, tc2.LRealVariable);
             Assert.AreEqual(tc.RealVariable, tc2.RealVariable);
             Assert.AreEqual(tc.DWordVariable, tc2.DWordVariable);
+            Assert.AreEqual(tc.WStringVariable, tc2.WStringVariable);
+            Assert.AreEqual(tc.StringVariable, tc2.StringVariable);
         }
 
         [TestMethod]
@@ -580,7 +585,9 @@ namespace S7.Net.UnitTest
                 IntVariable = -15000,
                 LRealVariable = -154.789,
                 RealVariable = -154.789f,
-                DWordVariable = 850
+                DWordVariable = 850,
+                WStringVariable = "ÄÜÉÊéà",
+                StringVariable = "Hallo"
             };
 
             await plc.WriteClassAsync(tc, DB2);
@@ -628,7 +635,10 @@ namespace S7.Net.UnitTest
                 IntVariable = -15000,
                 LRealVariable = -154.789,
                 RealVariable = -154.789f,
-                DWordVariable = 850
+                DWordVariable = 850,
+                WStringVariable = "ÄÜÉÊéà",
+                StringVariable = "Hallo"
+
             };
 
             await plc.WriteClassAsync(tc, DB2);
@@ -646,6 +656,9 @@ namespace S7.Net.UnitTest
             Assert.AreEqual(Math.Round(tc2.LRealVariable, 3), Math.Round(tc2Generic.LRealVariable, 3));
             Assert.AreEqual(tc2.RealVariable, tc2Generic.RealVariable);
             Assert.AreEqual(tc2.DWordVariable, tc2Generic.DWordVariable);
+            Assert.AreEqual(tc2.WStringVariable, tc2Generic.WStringVariable);
+            Assert.AreEqual(tc2.StringVariable, tc2Generic.StringVariable);
+
         }
 
         [TestMethod]
@@ -671,7 +684,9 @@ namespace S7.Net.UnitTest
                 IntVariable = -15000,
                 LRealVariable = -154.789,
                 RealVariable = -154.789f,
-                DWordVariable = 850
+                DWordVariable = 850,
+                WStringVariable = "ÄÜÉÊéà",
+                StringVariable = "Hallo"
             };
 
             await plc.WriteClassAsync(tc, DB2);
@@ -686,6 +701,8 @@ namespace S7.Net.UnitTest
             Assert.AreEqual(Math.Round(tc2Generic.LRealVariable, 3), Math.Round(tc2GenericWithClassFactory.LRealVariable, 3));
             Assert.AreEqual(tc2Generic.RealVariable, tc2GenericWithClassFactory.RealVariable);
             Assert.AreEqual(tc2Generic.DWordVariable, tc2GenericWithClassFactory.DWordVariable);
+            Assert.AreEqual(tc2Generic.WStringVariable, tc2GenericWithClassFactory.WStringVariable);
+            Assert.AreEqual(tc2Generic.StringVariable, tc2GenericWithClassFactory.StringVariable);
         }
 
         [TestMethod]
@@ -792,7 +809,9 @@ namespace S7.Net.UnitTest
                 IntVariable = -15000,
                 LRealVariable = -154.789,
                 RealVariable = -154.789f,
-                DWordVariable = 850
+                DWordVariable = 850,
+                WStringVariable = "ÄÜÉÊéà",
+                StringVariable = "Hallo"
             };
             plc.WriteClass(tc, DB2);
 

S7.Net.UnitTest/S7NetTestsSync.cs

@@ -5,6 +5,7 @@ using Microsoft.VisualStudio.TestTools.UnitTesting;
 using S7.Net.UnitTest.Helpers;
 using S7.Net.Types;
 using S7.UnitTest.Helpers;
+using System.Security.Cryptography;
 
 #endregion
 
@@ -183,6 +184,9 @@ namespace S7.Net.UnitTest
             tc.LRealVariable = -154.789;
             tc.RealVariable = -154.789f;
             tc.DWordVariable = 850;
+            tc.WStringVariable = "ÄÜÉÊéà";
+            tc.StringVariable = "Hallo";
+
             plc.WriteClass(tc, DB2);
             TestClass tc2 = new TestClass();
             // Values that are read from a class are stored inside the class itself, that is passed by reference
@@ -194,6 +198,8 @@ namespace S7.Net.UnitTest
             Assert.AreEqual(tc.LRealVariable, tc2.LRealVariable);
             Assert.AreEqual(tc.RealVariable, tc2.RealVariable);
             Assert.AreEqual(tc.DWordVariable, tc2.DWordVariable);
+            Assert.AreEqual(tc.WStringVariable, tc2.WStringVariable);
+            Assert.AreEqual(tc.StringVariable, tc2.StringVariable);
         }
 
         /// <summary>
@@ -577,6 +583,8 @@ namespace S7.Net.UnitTest
             tc.LRealVariable = -154.789;
             tc.RealVariable = -154.789f;
             tc.DWordVariable = 850;
+            tc.WStringVariable = "ÄÜÉÊéà";
+            tc.StringVariable = "Hallo";
 
             plc.WriteClass(tc, DB2);
 
@@ -622,6 +630,8 @@ namespace S7.Net.UnitTest
             tc.LRealVariable = -154.789;
             tc.RealVariable = -154.789f;
             tc.DWordVariable = 850;
+            tc.WStringVariable = "ÄÜÉÊéà";
+            tc.StringVariable = "Hallo";
 
             plc.WriteClass(tc, DB2);
 
@@ -637,6 +647,8 @@ namespace S7.Net.UnitTest
             Assert.AreEqual(Math.Round(tc2.LRealVariable, 3), Math.Round(tc2Generic.LRealVariable, 3));
             Assert.AreEqual(tc2.RealVariable, tc2Generic.RealVariable);
             Assert.AreEqual(tc2.DWordVariable, tc2Generic.DWordVariable);
+            Assert.AreEqual(tc2.WStringVariable, tc2Generic.WStringVariable);
+            Assert.AreEqual(tc2.StringVariable, tc2Generic.StringVariable);
         }
 
         [TestMethod, ExpectedException(typeof(PlcException))]
@@ -665,6 +677,8 @@ namespace S7.Net.UnitTest
             tc.LRealVariable = -154.789;
             tc.RealVariable = -154.789f;
             tc.DWordVariable = 850;
+            tc.WStringVariable = "ÄÜÉÊéà";
+            tc.StringVariable = "Hallo";
 
             plc.WriteClass(tc, DB2);
 
@@ -679,6 +693,8 @@ namespace S7.Net.UnitTest
             Assert.AreEqual(Math.Round(tc2Generic.LRealVariable, 3), Math.Round(tc2GenericWithClassFactory.LRealVariable, 3));
             Assert.AreEqual(tc2Generic.RealVariable, tc2GenericWithClassFactory.RealVariable);
             Assert.AreEqual(tc2Generic.DWordVariable, tc2GenericWithClassFactory.DWordVariable);
+            Assert.AreEqual(tc2Generic.WStringVariable, tc2GenericWithClassFactory.WStringVariable);
+            Assert.AreEqual(tc2Generic.StringVariable, tc2GenericWithClassFactory.StringVariable);
         }
 
         [TestMethod, ExpectedException(typeof(PlcException))]
@@ -837,6 +853,9 @@ namespace S7.Net.UnitTest
             tc.LRealVariable = -154.789;
             tc.RealVariable = -154.789f;
             tc.DWordVariable = 850;
+            tc.WStringVariable = "ÄÜÉÊéà";
+            tc.StringVariable = "Hallo";
+
             plc.WriteClass(tc, DB2);
 
             int expectedReadBytes = (int)Types.Class.GetClassSize(tc);

S7.Net.UnitTest/TypeTests/ClassTests.cs

@@ -17,6 +17,19 @@ namespace S7.Net.UnitTest.TypeTests
             Assert.AreEqual(Class.GetClassSize(new TestClassUnevenSize(3, 17)), 10);
         }
 
+        /// <summary>
+        /// Ensure Uint32 is correctly parsed through ReadClass functions. Adresses issue https://github.com/S7NetPlus/s7netplus/issues/414
+        /// </summary>
+        [TestMethod]
+        public void TestUint32Read()
+        {
+            var result = new TestUint32();
+            var data = new byte[4] { 0, 0, 0, 5 };
+            var bytesRead = Class.FromBytes(result, data);
+            Assert.AreEqual(bytesRead, data.Length);
+            Assert.AreEqual(5u, result.Value1);
+        }
+
         private class TestClassUnevenSize
         {
             public bool Bool { get; set; }
@@ -29,5 +42,10 @@ namespace S7.Net.UnitTest.TypeTests
                 Bools = new bool[bitCount];
             }
         }
+
+        private class TestUint32
+        {
+            public uint Value1 { get; set; }
+        }
     }
 }

S7.Net/PlcAsynchronous.cs

@@ -25,7 +25,7 @@ namespace S7.Net
         /// <returns>A task that represents the asynchronous open operation.</returns>
         public async Task OpenAsync(CancellationToken cancellationToken = default)
         {
-            var stream = await ConnectAsync().ConfigureAwait(false);
+            var stream = await ConnectAsync(cancellationToken).ConfigureAwait(false);
             try
             {
                 await queue.Enqueue(async () =>
@@ -44,11 +44,16 @@ namespace S7.Net
             }
         }
 
-        private async Task<NetworkStream> ConnectAsync()
+        private async Task<NetworkStream> ConnectAsync(CancellationToken cancellationToken)
         {
             tcpClient = new TcpClient();
             ConfigureConnection();
+
+#if NET5_0_OR_GREATER
+            await tcpClient.ConnectAsync(IP, Port, cancellationToken).ConfigureAwait(false);
+#else
             await tcpClient.ConnectAsync(IP, Port).ConfigureAwait(false);
+#endif
             return tcpClient.GetStream();
         }
 

S7.Net/S7.Net.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   
   <PropertyGroup>
-    <TargetFrameworks>net452;netstandard2.0;netstandard1.3</TargetFrameworks>
+    <TargetFrameworks>net452;netstandard2.0;netstandard1.3;net5.0</TargetFrameworks>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Properties\S7.Net.snk</AssemblyOriginatorKeyFile>
     <InternalsVisibleTo>S7.Net.UnitTest</InternalsVisibleTo>

S7.Net/Types/Class.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 
 namespace S7.Net.Types
 {
@@ -25,7 +26,7 @@ namespace S7.Net.Types
 
         }
 
-        private static double GetIncreasedNumberOfBytes(double numBytes, Type type)
+        private static double GetIncreasedNumberOfBytes(double numBytes, Type type, PropertyInfo? propertyInfo)
         {
             switch (type.Name)
             {
@@ -38,30 +39,30 @@ namespace S7.Net.Types
                     break;
                 case "Int16":
                 case "UInt16":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     numBytes += 2;
                     break;
                 case "Int32":
                 case "UInt32":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     numBytes += 4;
                     break;
                 case "Single":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     numBytes += 4;
                     break;
                 case "Double":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     numBytes += 8;
                     break;
+                case "String":
+                    S7StringAttribute? attribute = propertyInfo?.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                    if (attribute == default(S7StringAttribute))
+                        throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                    IncrementToEven(ref numBytes);
+                    numBytes += attribute.ReservedLengthInBytes;
+                    break;
                 default:
                     var propertyClass = Activator.CreateInstance(type);
                     numBytes = GetClassSize(propertyClass, numBytes, true);
@@ -93,12 +94,12 @@ namespace S7.Net.Types
                     IncrementToEven(ref numBytes);
                     for (int i = 0; i < array.Length; i++)
                     {
-                        numBytes = GetIncreasedNumberOfBytes(numBytes, elementType);
+                        numBytes = GetIncreasedNumberOfBytes(numBytes, elementType, property);
                     }
                 }
                 else
                 {
-                    numBytes = GetIncreasedNumberOfBytes(numBytes, property.PropertyType);
+                    numBytes = GetIncreasedNumberOfBytes(numBytes, property.PropertyType, property);
                 }
             }
             if (false == isInnerProperty)
@@ -111,7 +112,7 @@ namespace S7.Net.Types
             return numBytes;
         }
 
-        private static object? GetPropertyValue(Type propertyType, byte[] bytes, ref double numBytes)
+        private static object? GetPropertyValue(Type propertyType, PropertyInfo? propertyInfo, byte[] bytes, ref double numBytes)
         {
             object? value = null;
 
@@ -133,50 +134,35 @@ namespace S7.Net.Types
                     numBytes++;
                     break;
                 case "Int16":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     // hier auswerten
                     ushort source = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
                     value = source.ConvertToShort();
                     numBytes += 2;
                     break;
                 case "UInt16":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     // hier auswerten
                     value = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
                     numBytes += 2;
                     break;
                 case "Int32":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
-                    // hier auswerten
-                    uint sourceUInt = DWord.FromBytes(bytes[(int)numBytes + 3],
-                                                                       bytes[(int)numBytes + 2],
-                                                                       bytes[(int)numBytes + 1],
-                                                                       bytes[(int)numBytes + 0]);
+                    IncrementToEven(ref numBytes);
+                    var wordBuffer = new byte[4];
+                    Array.Copy(bytes, (int)numBytes, wordBuffer, 0, wordBuffer.Length);
+                    uint sourceUInt = DWord.FromByteArray(wordBuffer);
                     value = sourceUInt.ConvertToInt();
                     numBytes += 4;
                     break;
                 case "UInt32":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
-                    // hier auswerten
-                    value = DWord.FromBytes(
-                        bytes[(int)numBytes],
-                        bytes[(int)numBytes + 1],
-                        bytes[(int)numBytes + 2],
-                        bytes[(int)numBytes + 3]);
+                    IncrementToEven(ref numBytes);
+                    var wordBuffer2 = new byte[4];
+                    Array.Copy(bytes, (int)numBytes, wordBuffer2, 0, wordBuffer2.Length);
+                    value = DWord.FromByteArray(wordBuffer2);
                     numBytes += 4;
                     break;
                 case "Single":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     // hier auswerten
                     value = Real.FromByteArray(
                         new byte[] {
@@ -187,15 +173,31 @@ namespace S7.Net.Types
                     numBytes += 4;
                     break;
                 case "Double":
-                    numBytes = Math.Ceiling(numBytes);
-                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
-                        numBytes++;
+                    IncrementToEven(ref numBytes);
                     var buffer = new byte[8];
                     Array.Copy(bytes, (int)numBytes, buffer, 0, 8);
                     // hier auswerten
                     value = LReal.FromByteArray(buffer);
                     numBytes += 8;
                     break;
+                case "String":
+                    S7StringAttribute? attribute = propertyInfo?.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                    if (attribute == default(S7StringAttribute))
+                        throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                    IncrementToEven(ref numBytes);
+
+                    // get the value
+                    var sData = new byte[attribute.ReservedLengthInBytes];
+                    Array.Copy(bytes, (int)numBytes, sData, 0, sData.Length);
+                    value = attribute.Type switch
+                    {
+                        S7StringType.S7String => S7String.FromByteArray(sData),
+                        S7StringType.S7WString => S7WString.FromByteArray(sData),
+                        _ => throw new ArgumentException("Please use a valid string type for the S7StringAttribute")
+                    };
+                    numBytes += sData.Length;
+                    break;
                 default:
                     var propClass = Activator.CreateInstance(propertyType);
                     numBytes = FromBytes(propClass, bytes, numBytes);
@@ -227,7 +229,7 @@ namespace S7.Net.Types
                     for (int i = 0; i < array.Length && numBytes < bytes.Length; i++)
                     {
                         array.SetValue(
-                            GetPropertyValue(elementType, bytes, ref numBytes),
+                            GetPropertyValue(elementType, property, bytes, ref numBytes),
                             i);
                     }
                 }
@@ -235,7 +237,7 @@ namespace S7.Net.Types
                 {
                     property.SetValue(
                         sourceClass,
-                        GetPropertyValue(property.PropertyType, bytes, ref numBytes),
+                        GetPropertyValue(property.PropertyType, property, bytes, ref numBytes),
                         null);
                 }
             }
@@ -243,7 +245,7 @@ namespace S7.Net.Types
             return numBytes;
         }
 
-        private static double SetBytesFromProperty(object propertyValue, byte[] bytes, double numBytes)
+        private static double SetBytesFromProperty(object propertyValue, PropertyInfo? propertyInfo, byte[] bytes, double numBytes)
         {
             int bytePos = 0;
             int bitPos = 0;
@@ -285,6 +287,18 @@ namespace S7.Net.Types
                 case "Double":
                     bytes2 = LReal.ToByteArray((double)propertyValue);
                     break;
+                case "String":
+                    S7StringAttribute? attribute = propertyInfo?.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                    if (attribute == default(S7StringAttribute))
+                        throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                    bytes2 = attribute.Type switch
+                    {
+                        S7StringType.S7String => S7String.ToByteArray((string)propertyValue, attribute.ReservedLength),
+                        S7StringType.S7WString => S7WString.ToByteArray((string)propertyValue, attribute.ReservedLength),
+                        _ => throw new ArgumentException("Please use a valid string type for the S7StringAttribute")
+                    };
+                    break;
                 default:
                     numBytes = ToBytes(propertyValue, bytes, numBytes);
                     break;
@@ -320,12 +334,12 @@ namespace S7.Net.Types
                     Type elementType = property.PropertyType.GetElementType();
                     for (int i = 0; i < array.Length && numBytes < bytes.Length; i++)
                     {
-                        numBytes = SetBytesFromProperty(array.GetValue(i), bytes, numBytes);
+                        numBytes = SetBytesFromProperty(array.GetValue(i), property, bytes, numBytes);
                     }
                 }
                 else
                 {
-                    numBytes = SetBytesFromProperty(property.GetValue(sourceClass, null), bytes, numBytes);
+                    numBytes = SetBytesFromProperty(property.GetValue(sourceClass, null), property, bytes, numBytes);
                 }
             }
             return numBytes;

S7.Net/Types/S7StringAttribute.cs

@@ -2,7 +2,7 @@
 
 namespace S7.Net.Types
 {
-    [AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
+    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)]
     public sealed class S7StringAttribute : Attribute
     {
         private readonly S7StringType type;

appveyor.yml

@@ -1,4 +1,4 @@
-image: Visual Studio 2019
+image: Visual Studio 2022
 configuration: Release
 install:
   - choco install gitversion.portable -y