Fixed casting in GetIntAt

- fix #29

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Change Log
 All notable changed to this project will be documented in this file.
 
+## [1.1.80] - 18.05.2022
+### Added
+### Changed
+### Fixed
+- Fixed casting in GetIntAt [#29](https://github.com/fbarresi/Sharp7/issues/29)
+
 ## [1.1.79] - 09.02.2021
 ### Added
 - Constant for no errors `S7Consts.ResultOK`

Sharp7.Tests/TestUtilities.cs

@@ -100,7 +100,7 @@ namespace Sharp7.Tests
 
         [Theory]
         [InlineData(new byte[] { 1, 1, 0, 0 }, 0, 257)]
-        public void TestGetIntAt(byte[] buffer, int pos, int expected) { S7.GetIntAt(buffer, pos).ShouldBe(expected); }
+        public void TestGetIntAt(byte[] buffer, int pos, short expected) { S7.GetIntAt(buffer, pos).ShouldBe(expected); }
 
         [Theory]
         [InlineData(new byte[] { 0, 0, 0, 0 }, 0, 1, new byte[] { 0, 1, 0, 0 })]

Sharp7/S7.cs

@@ -103,9 +103,9 @@ namespace Sharp7
 
         #region Get/Set 16 bit signed value (S7 int) -32768..32767
 
-        public static int GetIntAt(this byte[] buffer, int pos)
+        public static short GetIntAt(this byte[] buffer, int pos)
         {
-            return (buffer[pos] << 8) | buffer[pos + 1];
+            return (short)((buffer[pos] << 8) | buffer[pos + 1]);
         }
 
         public static void SetIntAt(this byte[] buffer, int pos, Int16 value)