int conv_arg, MonoType **conv_arg_type,
MarshalAction action);
+MONO_RT_EXTERNAL_ONLY
MONO_API MonoString *
mono_string_from_bstr (gpointer bstr);
+MonoString *
+mono_string_from_bstr_icall (gpointer bstr);
+
+MonoString *
+mono_string_from_bstr_checked (gpointer bstr, MonoError *error);
+
MONO_API void
mono_free_bstr (gpointer bstr);