Initial code.

SAM.API/Wrappers/SteamApps001.cs

@@ -0,0 +1,56 @@
+/* Copyright (c) 2017 Rick (rick 'at' gibbed 'dot' us)
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would
+ *    be appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not
+ *    be misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ *    distribution.
+ */
+
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+using SAM.API.Interfaces;
+
+namespace SAM.API.Wrappers
+{
+    public class SteamApps001 : NativeWrapper<ISteamApps001>
+    {
+        #region GetAppData
+        [UnmanagedFunctionPointer(CallingConvention.ThisCall)]
+        private delegate int NativeGetAppData(
+            IntPtr self,
+            uint appId,
+            string key,
+            StringBuilder valueBuffer,
+            int valueLength);
+
+        public string GetAppData(uint appId, string key)
+        {
+            var sb = new StringBuilder();
+            sb.EnsureCapacity(1024);
+            int result = this.Call<int, NativeGetAppData>(
+                this.Functions.GetAppData,
+                this.ObjectAddress,
+                appId,
+                key,
+                sb,
+                sb.Capacity);
+            return result == 0 ? null : sb.ToString();
+        }
+        #endregion
+    }
+}