ENH: Add otbImageKeywordlist test

Testing/Code/IO/otbImageKeywordlist.cxx

+/*=========================================================================
+
+Program:   ORFEO Toolbox
+Language:  C++
+Date:      $Date$
+Version:   $Revision$
+
+
+Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
+See OTBCopyright.txt for details.
+
+
+This software is distributed WITHOUT ANY WARRANTY; without even
+the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#if defined(_MSC_VER)
+#pragma warning ( disable : 4786 )
+#endif
+
+#include <iostream>
+#include "otbVectorImage.h"
+#include "otbImageFileReader.h"
+#
+int otbImageKeywordlist( int argc, char* argv[] )
+{
+  if (argc!=3)
+  {
+    std::cout << argv[0] <<" <input filename> <output filename>"
+    << std::endl;
+
+    return EXIT_FAILURE;
+  }
+
+  char * filename = argv[1];
+  char * outFilename = argv[2];
+
+  std::ofstream file;
+  file.open(outFilename);
+  file << std::setprecision(15);
+
+
+  typedef otb::VectorImage<double, 2> ImageType;
+  typedef otb::ImageFileReader<ImageType> ReaderType;
+  ReaderType::Pointer reader = ReaderType::New();
+  reader->SetFileName(filename);
+  reader->UpdateOutputInformation();
+
+  file << "*** KEYWORD LIST ***\n";
+  file << reader->GetOutput()->GetImageKeywordlist();
+  file.close();
+  return EXIT_SUCCESS;
+}
+