--- a/Core/DicomFormat/DicomInstanceHasher.cpp	Thu Dec 06 12:23:46 2018 +0100
+++ b/Core/DicomFormat/DicomInstanceHasher.cpp	Thu Dec 06 12:27:30 2018 +0100
@@ -53,7 +53,7 @@
         seriesUid_.size() == 0 ||
         instanceUid_.size() == 0)
     {
-      throw OrthancException(ErrorCode_BadFileFormat);
+      throw OrthancException(ErrorCode_BadFileFormat, "missing StudyInstanceUID, SeriesInstanceUID or SOPInstanceUID");
     }
   }
 

--- a/Core/EnumerationDictionary.h	Thu Dec 06 12:23:46 2018 +0100
+++ b/Core/EnumerationDictionary.h	Thu Dec 06 12:27:30 2018 +0100
@@ -37,7 +37,6 @@
 
 #include "Toolbox.h"
 #include <boost/lexical_cast.hpp>
-#include <boost/lexical_cast/try_lexical_convert.hpp>
 #include <string>
 #include <map>
 
@@ -85,10 +84,9 @@
 
       Enumeration Translate(const std::string& str) const
       {
-        int numericalValue; // at this stage, we don't know if str is an alias or a numerical value
-        if (boost::conversion::try_lexical_convert<int>(str, numericalValue))
+        if (Toolbox::IsInteger(str))
         {
-          return static_cast<Enumeration>(numericalValue);
+          return static_cast<Enumeration>(boost::lexical_cast<int>(str));
         }
 
         typename StringToEnumeration::const_iterator

--- a/Plugins/Samples/Common/OrthancPluginCppWrapper.cpp	Thu Dec 06 12:23:46 2018 +0100
+++ b/Plugins/Samples/Common/OrthancPluginCppWrapper.cpp	Thu Dec 06 12:27:30 2018 +0100
@@ -1152,7 +1152,10 @@
     }
     else
     {
-      answer.ToJson(result);
+      if (!answer.IsEmpty())
+      {
+        answer.ToJson(result);
+      }
       return true;
     }
   }
@@ -1172,7 +1175,10 @@
     }
     else
     {
-      answer.ToJson(result);
+      if (!answer.IsEmpty())
+      {
+        answer.ToJson(result);
+      }
       return true;
     }
   }
@@ -1202,7 +1208,10 @@
     }
     else
     {
-      answer.ToJson(result);
+      if (!answer.IsEmpty()) // i.e, on a PUT to metadata/..., orthand returns an empty response
+      {
+        answer.ToJson(result);
+      }
       return true;
     }
   }

--- a/Plugins/Samples/Common/OrthancPluginCppWrapper.h	Thu Dec 06 12:23:46 2018 +0100
+++ b/Plugins/Samples/Common/OrthancPluginCppWrapper.h	Thu Dec 06 12:27:30 2018 +0100
@@ -140,6 +140,11 @@
       return buffer_.size;
     }
 
+    bool IsEmpty() const
+    {
+      return GetSize() == 0 || GetData() == NULL;
+    }
+
     void Clear();
 
     void ToString(std::string& target) const;
@@ -443,6 +448,15 @@
                        body.size(), applyPlugins);
   }
 
+  inline bool RestApiPost(Json::Value& result,
+                          const std::string& uri,
+                          const MemoryBuffer& body,
+                          bool applyPlugins)
+  {
+    return RestApiPost(result, uri, body.GetData(),
+                       body.GetSize(), applyPlugins);
+  }
+
   bool RestApiPut(Json::Value& result,
                   const std::string& uri,
                   const char* body,

--- a/Resources/CMake/OrthancFrameworkConfiguration.cmake	Thu Dec 06 12:23:46 2018 +0100
+++ b/Resources/CMake/OrthancFrameworkConfiguration.cmake	Thu Dec 06 12:27:30 2018 +0100
@@ -125,6 +125,7 @@
   ${ORTHANC_ROOT}/Core/Cache/MemoryCache.cpp
   ${ORTHANC_ROOT}/Core/ChunkedBuffer.cpp
   ${ORTHANC_ROOT}/Core/DicomFormat/DicomTag.cpp
+  ${ORTHANC_ROOT}/Core/EnumerationDictionary.h
   ${ORTHANC_ROOT}/Core/Enumerations.cpp
   ${ORTHANC_ROOT}/Core/FileStorage/MemoryStorageArea.cpp
   ${ORTHANC_ROOT}/Core/Logging.cpp

--- a/TODO	Thu Dec 06 12:23:46 2018 +0100
+++ b/TODO	Thu Dec 06 12:27:30 2018 +0100
@@ -134,8 +134,6 @@
   Release() and Acquire())
 * Avoid direct calls to FromDcmtkBridge (make most of its 
   methods private), go through ParsedDicomFile wherever possible
-* avoid boost::bad_lexical_cast exception at least in happy path 
-  by using boost::conversion::try_lexical_convert
 
 =================
 Platform-specific