Fixed CLI and CSharp support for out parameter const char strings.

Added test for out parameter const char strings.

src/Generator/Generators/CLI/CLIMarshal.cs

@@ -67,15 +67,6 @@ namespace CppSharp.Generators.CLI
 
             var pointee = pointer.Pointee.Desugar();
 
-            PrimitiveType primitive;
-            var param = Context.Parameter;
-            if (param != null && (param.IsOut || param.IsInOut) &&
-                pointee.IsPrimitiveType(out primitive))
-            {
-                Context.Return.Write(Context.ReturnVarName);
-                return true;
-            }
-
             if (pointee.IsPrimitiveType(PrimitiveType.Void))
             {
                 Context.Return.Write(Context.ReturnVarName);
@@ -89,6 +80,15 @@ namespace CppSharp.Generators.CLI
                 return true;
             }
 
+            PrimitiveType primitive;
+            var param = Context.Parameter;
+            if (param != null && (param.IsOut || param.IsInOut) &&
+                pointee.IsPrimitiveType(out primitive))
+            {
+                Context.Return.Write(Context.ReturnVarName);
+                return true;
+            }
+
             if (pointee.IsPrimitiveType(out primitive))
             {
                 var returnVarName = Context.ReturnVarName;

src/Generator/Generators/CLI/CLITypePrinter.cs

@@ -155,8 +155,7 @@ namespace CppSharp.Generators.CLI
             {
                 // Skip one indirection if passed by reference
                 var param = Context.Parameter;
-                if (param != null && (param.IsOut || param.IsInOut)
-                    && pointee == finalPointee)
+                if (param != null && (param.IsOut || param.IsInOut))
                     return pointee.Visit(this, quals);
 
                 return pointee.Visit(this, quals) + "*";

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -430,8 +430,16 @@ namespace CppSharp.Generators.CSharp
                 pointee.IsPrimitiveType(PrimitiveType.WideChar)) &&
                 pointer.QualifiedPointee.Qualifiers.IsConst)
             {
-                Context.Return.Write(MarshalStringToUnmanaged(Context.Parameter.Name));
-                CSharpContext.Cleanup.WriteLine("Marshal.FreeHGlobal({0});", Context.ArgName);
+                if (Context.Parameter.IsOut)
+                {
+                    Context.Return.Write("IntPtr.Zero");
+                    CSharpContext.ArgumentPrefix.Write("&");
+                }
+                else
+                {
+                    Context.Return.Write(MarshalStringToUnmanaged(Context.Parameter.Name));
+                    CSharpContext.Cleanup.WriteLine("Marshal.FreeHGlobal({0});", Context.ArgName);
+                }
                 return true;
             }
 

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -217,8 +217,7 @@ namespace CppSharp.Generators.CSharp
             {
                 // Skip one indirection if passed by reference
                 var param = Context.Parameter;
-                if (isManagedContext && param != null && (param.IsOut || param.IsInOut)
-                    && pointee == finalPointee)
+                if (isManagedContext && param != null && (param.IsOut || param.IsInOut))
                     return pointee.Visit(this, quals);
 
                 if (ContextKind == CSharpTypePrinterContextKind.GenericDelegate)

tests/Basic/Basic.Tests.cs

@@ -55,6 +55,10 @@ public class BasicTests : GeneratorTestFixture
         //Assert.That(hello.RetEnum(Enum.D), Is.EqualTo(-2147483648));
         Assert.That(hello.RetEnum(Enum.E), Is.EqualTo(1));
         Assert.That(hello.RetEnum(Enum.F), Is.EqualTo(-9));
+
+        string str;
+        hello.StringOut(out str);
+        Assert.That(str, Is.EqualTo("HelloStringOut"));
     }
 
     [Test]

tests/Basic/Basic.cpp

@@ -203,6 +203,11 @@ void Hello::EnumInOutRef(CS_IN_OUT Enum& e)
 		e = Enum::F;
 }
 
+void Hello::StringOut(CS_OUT const char** str)
+{
+	*str = "HelloStringOut";
+}
+
 int unsafeFunction(const Bar& ret, char* testForString, void (*foo)(int))
 {
     return ret.A;

tests/Basic/Basic.h

@@ -132,6 +132,8 @@ public:
 
     void EnumInOut(CS_IN_OUT Enum* e);
     void EnumInOutRef(CS_IN_OUT Enum& e);
+
+    void StringOut(CS_OUT const char** str);
 };
 
 class DLL_API AbstractFoo