Generated compilable wrappers for functions taking char*.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -344,8 +344,9 @@ namespace CppSharp.Generators.CSharp
             var pointee = pointer.Pointee;
 
             Type type = pointee.Desugar();
-            if (type.IsPrimitiveType(PrimitiveType.Char) ||
+            if ((type.IsPrimitiveType(PrimitiveType.Char) ||
-                type.IsPrimitiveType(PrimitiveType.WideChar))
+                type.IsPrimitiveType(PrimitiveType.WideChar)) &&
+                pointer.QualifiedPointee.Qualifiers.IsConst)
             {
                 Context.Return.Write("Marshal.StringToHGlobalAnsi({0})",
                     Helpers.SafeIdentifier(Context.Parameter.Name));

tests/Basic/Basic.cpp

@@ -71,7 +71,7 @@ int Hello::RetEnum(Enum e)
     return (int)e;
 }
 
-int unsafeFunction(const Bar& ret)
+int unsafeFunction(const Bar& ret, char* testForString)
 {
     return ret.A;
 }
@@ -82,4 +82,4 @@ Bar operator+(const Bar& b1, const Bar& b2)
     b.A = b1.A + b2.A;
     b.B = b1.B + b2.B;
     return b;
-}
+}

tests/Basic/Basic.h

@@ -73,4 +73,4 @@ public:
 
 DLL_API Bar operator+(const Bar &, const Bar &);
 
-int DLL_API unsafeFunction(const Bar& ret);
+int DLL_API unsafeFunction(const Bar& ret, char* testForString);