Move libvlc loading to a static method which needs to be called by user code...

Move libvlc loading to a static method which needs to be called by user code before using any object from the binding

LibVLCSharp/Core.cs

+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace VideoLAN.LibVLC
+{
+    public static class Core
+    {
+        struct Native
+        {
+            [DllImport("kernel32.dll", SetLastError = true)]
+            internal static extern IntPtr LoadLibrary(string dllToLoad);
+
+            [DllImport("kernel32.dll", SetLastError = true)]
+            internal static extern IntPtr LoadPackagedLibrary(string dllToLoad);
+        }
+
+        static IntPtr _libvlccoreHandle;
+        static IntPtr _libvlcHandle;
+
+        const string Win64 = "win-x64";
+        const string Win86 = "win-x86";
+        const string Winrt64 = "winrt-x64";
+        const string Winrt86 = "winrt-x86";
+
+        const string Libvlc = "libvlc";
+        const string Libvlccore = "libvlccore";
+
+        public static void Initialize()
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                InitializeWindows();
+            }
+        }
+
+        //TODO: check if Store app
+        //TODO: Add Unload library func using handles
+        static void InitializeWindows()
+        {
+            var myPath = new Uri(typeof(Instance).Assembly.CodeBase).LocalPath;
+            var appExecutionDirectory = Path.GetDirectoryName(myPath);
+            if (appExecutionDirectory == null)
+                throw new NullReferenceException(nameof(appExecutionDirectory));
+
+            var arch = Environment.Is64BitProcess ? Win64 : Win86;
+           
+            var libvlccorePath = Path.Combine(Path.Combine(appExecutionDirectory, Libvlc), Path.Combine(arch, $"{Libvlccore}.dll"));
+            var libvlcPath = Path.Combine(Path.Combine(appExecutionDirectory, Libvlc), Path.Combine(arch, $"{Libvlc}.dll"));
+
+            LoadLibvlcLibraries(libvlccorePath, libvlcPath);    
+        }
+
+        static void LoadLibvlcLibraries(string libvlccorePath, string libvlcPath)
+        {
+            if(string.IsNullOrEmpty(libvlccorePath)) throw new NullReferenceException(nameof(libvlccorePath));
+            if(string.IsNullOrEmpty(libvlcPath)) throw new NullReferenceException(nameof(libvlcPath));
+
+            _libvlccoreHandle = Native.LoadLibrary(libvlccorePath);
+            if(_libvlccoreHandle == IntPtr.Zero)
+                throw new InvalidOperationException("failed to load libvlccore with path " + libvlccorePath + ". Aborting...");
+
+            _libvlcHandle = Native.LoadLibrary(libvlcPath);
+            if (_libvlcHandle == IntPtr.Zero)
+                throw new InvalidOperationException("failed to load libvlc with path " + libvlcPath + ". Aborting...");
+        }
+    }
+}
\ No newline at end of file

Sample/Program.cs

 using System;
-using System.IO;
 using System.Runtime.InteropServices;
 
 using VideoLAN.LibVLC;
@@ -11,21 +10,7 @@ namespace Sample
     {
         static void Main(string[] args)
         {
-            var myPath = new Uri(typeof(Instance).Assembly.CodeBase).LocalPath;
-            var appExecutionDirectory = Path.GetDirectoryName(myPath);
-            if (appExecutionDirectory == null)
-                throw new NullReferenceException(nameof(appExecutionDirectory));
-
-            // TODO: check if running in a Store app
-            var arch = Environment.Is64BitProcess ? "win-x64" : "win-x86";
-            const string libvlc = "libvlc";
-            const string libvlccore = "libvlccore";
-
-            var libvlccorePath = Path.Combine(Path.Combine(appExecutionDirectory, libvlc), Path.Combine(arch, $"{libvlccore}.dll"));
-            var libvlcPath = Path.Combine(Path.Combine(appExecutionDirectory, libvlc), Path.Combine(arch, $"{libvlc}.dll"));
-
-            var r1 = LoadLibrary(libvlccorePath);
-            var r2 = LoadLibrary(libvlcPath);
+            Core.Initialize();
 
             var instance = new Instance();
             var media = new Media(instance, "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4", Media.FromType.FromLocation);
@@ -33,11 +18,5 @@ namespace Sample
             mp.Play();
             Console.ReadKey();
         }
-
-        [DllImport("kernel32.dll", SetLastError = true)]
-        static extern IntPtr LoadLibrary(string dllToLoad);
-
-        [DllImport("kernel32.dll", SetLastError = true)]
-        static extern IntPtr LoadPackagedLibrary(string dllToLoad);
     }
-}
+}
\ No newline at end of file