--- a/Resources/Orthanc/Core/Images/PngReader.h	Tue Nov 22 15:54:06 2016 +0100
+++ b/Resources/Orthanc/Core/Images/PngReader.h	Wed Nov 23 12:08:15 2016 +0100
@@ -41,6 +41,10 @@
 #include <boost/shared_ptr.hpp>
 #include <boost/noncopyable.hpp>
 
+#if !defined(ORTHANC_SANDBOXED)
+#  error The macro ORTHANC_SANDBOXED must be defined
+#endif
+
 namespace Orthanc
 {
   class PngReader : 
@@ -59,7 +63,9 @@
   public:
     PngReader();
 
+#if ORTHANC_SANDBOXED == 0
     void ReadFromFile(const std::string& filename);
+#endif
 
     void ReadFromMemory(const void* buffer,
                         size_t size);