fix for dubious UTF8 conversion

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Unreleased
 - FIXED #74 by adding support for UTF-8 in options #302
-- FIXED #305 by String interop conversions are now made in UTF-8 and avoid memory leaks #306
+- FIXED #305 by String interop conversions are now made in UTF-8 and avoid memory leaks #306 #310
 - FIXED #276 by changing NuGet package folder structure #309
 
 # 2.1.154

src/Vlc.DotNet.Core.Interops/Signatures/libvlc_media_player.h/libvlc_track_description_t.cs

@@ -7,7 +7,7 @@ namespace Vlc.DotNet.Core.Interops.Signatures
     public struct TrackDescriptionStructure
     {
         public int Id;
-        public string Name;
+        public IntPtr Name;
         public IntPtr NextTrackDescription;
     }
 }

src/Vlc.DotNet.Core.Interops/VlcManager.AddOptionFlagToMedia.cs

@@ -11,9 +11,11 @@ public void AddOptionFlagToMedia(VlcMediaInstance mediaInstance, string option,
         {
             if (mediaInstance == IntPtr.Zero)
                 throw new ArgumentException("Media instance is not initialized.");
-            var handle = GCHandle.Alloc(Encoding.UTF8.GetBytes(option), GCHandleType.Pinned);
-            GetInteropDelegate<AddOptionFlagToMedia>().Invoke(mediaInstance, handle.AddrOfPinnedObject(), flag);
-            handle.Free();
+
+            using (var handle = Utf8InteropStringConverter.ToUtf8Interop(option))
+            {
+                GetInteropDelegate<AddOptionFlagToMedia>().Invoke(mediaInstance, handle.DangerousGetHandle(), flag);
+            }
         }
     }
 }

src/Vlc.DotNet.Core.Interops/VlcManager.AddOptionToMedia.cs

@@ -13,9 +13,11 @@ public void AddOptionToMedia(VlcMediaInstance mediaInstance, string option)
                 throw new ArgumentException("Media instance is not initialized.");
             if (string.IsNullOrEmpty(option))
                 return;
-            var handle = GCHandle.Alloc(Encoding.UTF8.GetBytes(option), GCHandleType.Pinned);
-            GetInteropDelegate<AddOptionToMedia>().Invoke(mediaInstance, handle.AddrOfPinnedObject());
-            handle.Free();
+
+            using (var handle = Utf8InteropStringConverter.ToUtf8Interop(option))
+            {
+                GetInteropDelegate<AddOptionToMedia>().Invoke(mediaInstance, handle.DangerousGetHandle());
+            }
         }
 
         public void AddOptionToMedia(VlcMediaInstance mediaInstance, string[] options)

src/Vlc.DotNet.Core.Interops/VlcManager.CreateNewInstance.cs

@@ -27,7 +27,10 @@ public void CreateNewInstance(string[] args)
             {
                 foreach (var arg in utf8Args)
                 {
-                    Marshal.FreeHGlobal(arg);
+                    if (arg != IntPtr.Zero)
+                    {
+                        Marshal.FreeHGlobal(arg);
+                    }
                 }
             }
         }

src/Vlc.DotNet.Core.Interops/VlcManager.CreateNewMediaFromLocation.cs

@@ -8,10 +8,10 @@ public sealed partial class VlcManager
     {
         public VlcMediaInstance CreateNewMediaFromLocation(string mrl)
         {
-            var handle = GCHandle.Alloc(Encoding.UTF8.GetBytes(mrl), GCHandleType.Pinned);
-            var result = VlcMediaInstance.New(this, GetInteropDelegate<CreateNewMediaFromLocation>().Invoke(myVlcInstance, handle.AddrOfPinnedObject()));
-            handle.Free();
-            return result;
+            using (var handle = Utf8InteropStringConverter.ToUtf8Interop(mrl))
+            {
+                return VlcMediaInstance.New(this, GetInteropDelegate<CreateNewMediaFromLocation>().Invoke(myVlcInstance, handle.DangerousGetHandle()));
+            }
         }
     }
 }

src/Vlc.DotNet.Core.Interops/VlcManager.CreateNewMediaFromPath.cs

@@ -8,10 +8,10 @@ public sealed partial class VlcManager
     {
         public VlcMediaInstance CreateNewMediaFromPath(string mrl)
         {
-            var handle = GCHandle.Alloc(Encoding.UTF8.GetBytes(mrl), GCHandleType.Pinned);
-            var result = VlcMediaInstance.New(this, GetInteropDelegate<CreateNewMediaFromPath>().Invoke(myVlcInstance, handle.AddrOfPinnedObject()));
-            handle.Free();
-            return result;
+            using (var handle = Utf8InteropStringConverter.ToUtf8Interop(mrl))
+            {
+                return VlcMediaInstance.New(this, GetInteropDelegate<CreateNewMediaFromPath>().Invoke(myVlcInstance, handle.DangerousGetHandle()));
+            }
         }
     }
 }

src/Vlc.DotNet.Core.Interops/VlcManager.SetMediaMeta.cs

@@ -11,9 +11,10 @@ public void SetMediaMeta(VlcMediaInstance mediaInstance, MediaMetadatas metadata
         {
             if (mediaInstance == IntPtr.Zero)
                 throw new ArgumentException("Media instance is not initialized.");
-            var handle = GCHandle.Alloc(Encoding.UTF8.GetBytes(value), GCHandleType.Pinned);
-            GetInteropDelegate<SetMediaMetadata>().Invoke(mediaInstance, metadata, handle.AddrOfPinnedObject());
-            handle.Free();
+            using (var handle = Utf8InteropStringConverter.ToUtf8Interop(value))
+            {
+                GetInteropDelegate<SetMediaMetadata>().Invoke(mediaInstance, metadata, handle.DangerousGetHandle());
+            }
         }
     }
 }

src/Vlc.DotNet.Core/TrackDescription.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Text;
+using Vlc.DotNet.Core.Interops;
 using Vlc.DotNet.Core.Interops.Signatures;
 
 namespace Vlc.DotNet.Core
@@ -23,7 +24,7 @@ internal static List<TrackDescription> GetSubTrackDescription(IntPtr moduleRef)
             if (moduleRef != IntPtr.Zero)
             {
                 var module = (TrackDescriptionStructure)Marshal.PtrToStructure(moduleRef, typeof(TrackDescriptionStructure));
-                var name = Encoding.UTF8.GetString(Encoding.Default.GetBytes(module.Name));
+                var name = Utf8InteropStringConverter.Utf8InteropToString(module.Name);
                 result.Add(new TrackDescription(module.Id, name));
                 var data = GetSubTrackDescription(module.NextTrackDescription);
                 result.AddRange(data);