Fixed native-to-managed marshaling for strings.

binder/Generators/C/CMarshal.cs

@@ -97,19 +97,23 @@ namespace MonoManagedToNative.Generators
         public CMarshalNativeToManaged(MarshalContext marshalContext)
             : base(marshalContext)
         {
-        }
-
-        bool HandleSpecialCILType(CILType cilType)
-        {
-            var type = cilType.Type;
-
-            if (type == typeof(string))
-            {
-                Context.Return.Write("{0}", Context.ArgName);
-                return true;
-            }
-
-            return false;
+        }
+
+        bool HandleSpecialCILType(CILType cilType)
+        {
+            var type = cilType.Type;
+
+            if (type == typeof(string))
+            {
+                var argId = CGenerator.GenId(Context.ArgName);
+                var domainId = CGenerator.GenId("mono_domain");
+                Context.SupportBefore.WriteLine("MonoString* {0} = mono_string_new({1}, {2});",
+                    argId, domainId, Context.ArgName);
+                Context.Return.Write("{0}", argId);
+                return true;
+            }
+
+            return false;
         }
 
         public override bool VisitCILType(CILType type, TypeQualifiers quals)