From fe537efa6e65b2d11277b3972a146eee455a9c7b Mon Sep 17 00:00:00 2001
From: Andreas Suter <andreas.suter@psi.ch>
Date: Sat, 11 Apr 2020 21:21:33 +0200
Subject: [PATCH] improved error messages for NeXus file reading. Especially
 for the case of HDF4/HDF5 <-> NeXus version issues.

---
 src/external/nexus/PNeXus.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/external/nexus/PNeXus.cpp b/src/external/nexus/PNeXus.cpp
index 43f70853..e6ed725d 100644
--- a/src/external/nexus/PNeXus.cpp
+++ b/src/external/nexus/PNeXus.cpp
@@ -2045,7 +2045,14 @@ int PNeXus::ReadFile(const char *fileName)
   // close file
   NXclose(&fFileHandle);
 
+  std::stringstream ss;
   switch (fIdfVersion) {
+  case 0:
+    fErrorCode = PNEXUS_IDF_NOT_IMPLEMENTED;
+    ss << ">> **ERROR** update of the HDF4/HDF5 libs without recompilation of the NeXus lib?";
+    fErrorMsg = ss.str();
+    status = NX_ERROR;
+    break;
   case 1:
     status = ReadFileIdf1();
     if (status != NX_OK) {
@@ -2062,7 +2069,6 @@ int PNeXus::ReadFile(const char *fileName)
     break;
   default:
     fErrorCode = PNEXUS_IDF_NOT_IMPLEMENTED;
-    std::stringstream ss;
     ss << ">> **ERROR** idf_version=" << fIdfVersion << " not yet implemented.";
     fErrorMsg = ss.str();
     status = NX_ERROR;