ENH: Adding a small ex to quickly extract a binary field

diff --git a/Example/exExtractTag.cxx b/Example/exExtractTag.cxx
new file mode 100644 (file)
index 0000000..297b149
--- /dev/null
+++ b/Example/exExtractTag.cxx
@@ -0,0 +1,108 @@
+/*=========================================================================
+                                                                                
+  Program:   gdcm
+  Module:    $RCSfile: exExtractTag.cxx,v $
+  Language:  C++
+  Date:      $Date: 2005/10/10 21:57:57 $
+  Version:   $Revision: 1.1 $
+                                                                                
+  Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
+  l'Image). All rights reserved. See Doc/License.txt or
+  http://www.creatis.insa-lyon.fr/Public/Gdcm/License.html 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.
+                                                                                
+=========================================================================*/
+#include "gdcmFile.h"
+#include "gdcmFileHelper.h"
+#include "gdcmCommon.h"
+#include "gdcmDebug.h"
+#include "gdcmDocEntry.h"
+#include "gdcmBinEntry.h"
+
+#include <iomanip>
+
+int main(int argc, char *argv[])
+{  
+   gdcm::File *f;
+ 
+   if( argc < 5 )
+     {
+     std::cerr << "Usage :" << argv[0] << " input.dcm  group element outputfile" << std::endl;
+     std::cerr << "  Ex: " << argv[0] << " /tmp/bla.dcm 0029 2110 /tmp/out.raw" << std::endl;
+     return 1;
+     }
+   std::string fileName = argv[1];
+
+   std::cout << fileName << std::endl;
+// ============================================================
+//   Read the input image.
+// ============================================================
+
+   f = new gdcm::File( );
+
+   //f->SetLoadMode(gdcm::LD_NOSEQ | gdcm::LD_NOSHADOW);
+   f->SetFileName( fileName );
+   bool res = f->Load();  
+
+   if( gdcm::Debug::GetDebugFlag() )
+   {
+      std::cout << "---------------------------------------------" << std::endl;
+      f->Print();
+      std::cout << "---------------------------------------------" << std::endl;
+   }
+   if (!res) {
+       std::cerr << "Sorry, " << fileName << " not a gdcm-readable "
+           << "DICOM / ACR File"
+           << std::endl;
+      delete f;
+      return 1;
+   }
+   std::cout << " ... is readable " << std::endl;
+
+   // Find the dicom tag, and extract the string
+   uint16_t group, elem;
+   std::istringstream convert;
+   convert.str( argv[2] );
+   convert >> std::hex >> group;
+   convert.clear(); //important
+   convert.str( argv[3] );
+   convert >> std::hex >> elem;
+   std::cout << "Extracting tag: (0x" << std::hex << std::setw(4) << std::setfill('0')
+     << group << ",0x" << std::setw(4) << std::setfill('0') << elem << ")" << std::endl;
+   std::string dicom_tag_value = f->GetEntryValue(group, elem);
+   if (dicom_tag_value == gdcm::GDCM_UNFOUND)
+   {
+     gdcm::DictEntry *dictEntry = f->GetPubDict()->GetEntry( group, elem);
+     std::cerr << "Image doesn't contain any tag: " << dictEntry->GetName() << std::endl;
+     delete f;
+     return 1;
+   }
+
+   gdcm::DocEntry *dicom_tag_doc = f->GetDocEntry(group, elem);
+   gdcm::BinEntry *dicom_tag = dynamic_cast<gdcm::BinEntry*>(dicom_tag_doc);
+   if( !dicom_tag )
+     {
+     std::cerr << "Sorry BinEntry only please" << std::endl; //TODO support ValEntry
+     delete f;
+     return 1;
+     }
+
+   // Write out the data as a file:
+   std::ofstream o(argv[4]);
+   if( !o )
+     {
+     std::cerr << "Problem opening file: " << argv[4] << std::endl;
+     delete f;
+     return 1;
+     }
+   o.write((char*)dicom_tag->GetBinArea(), dicom_tag->GetLength());
+   o.close();
+
+   delete f;
+   return 0;
+}
+
+