# ReformatFile.cs

This is a C++ example on how to use gdcm::FileDerivation

    /*=========================================================================

      Program: GDCM (Grassroots DICOM). A DICOM library
      Module:  $URL$

      Copyright (c) 2006-2010 Mathieu Malaterre
      All rights reserved.
      See Copyright.txt or http://gdcm.sourceforge.net/Copyright.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 notice for more information.

    =========================================================================*/

    /*
     * Simple C# example
     *
     * Usage:
     * $ export LD_LIBRARY_PATH=$HOME/Projects/gdcm/debug-gcc/bin
     * $ mono bin/ReformatFile.exe input.dcm output.dcm
     */
    using System;
    using gdcm;

    public class ReformatFile
    {
      public static int Main(string[] args)
        {
        gdcm.FileMetaInformation.SetSourceApplicationEntityTitle( "My Reformat App" );

        // http://www.oid-info.com/get/1.3.6.1.4.17434
        string THERALYS_ORG_ROOT = "1.3.6.1.4.17434";
        gdcm.UIDGenerator.SetRoot( THERALYS_ORG_ROOT );
        System.Console.WriteLine( "Root dir is now: " + gdcm.UIDGenerator.GetRoot() );

        string filename = args[0];
        string outfilename = args[1];

        Reader reader = new Reader();
        reader.SetFileName( filename );
        if( !reader.Read() )
          {
          System.Console.WriteLine( "Could not read: " + filename );
          return 1;
          }

        UIDGenerator uid = new UIDGenerator(); // helper for uid generation
        FileDerivation fd = new FileDerivation();
        // For the pupose of this execise we will pretend that this image is referencing
        // two source image (we need to generate fake UID for that).
        string ReferencedSOPClassUID = "1.2.840.10008.5.1.4.1.1.7"; // Secondary Capture
        fd.AddReference( ReferencedSOPClassUID, uid.Generate() );
        fd.AddReference( ReferencedSOPClassUID, uid.Generate() );

        // Again for the purpose of the exercise we will pretend that the image is a
        // multiplanar reformat (MPR):
        // CID 7202 Source Image Purposes of Reference
        // {"DCM",121322,"Source image for image processing operation"},
        fd.SetPurposeOfReferenceCodeSequenceCodeValue( 121322 );
        // CID 7203 Image Derivation
        // { "DCM",113072,"Multiplanar reformatting" },
        fd.SetDerivationCodeSequenceCodeValue( 113072 );
        fd.SetFile( reader.GetFile() );
        // If all Code Value are ok the filter will execute properly
        if( !fd.Derive() )
          {
          return 1;
          }

        gdcm.FileMetaInformation fmi = reader.GetFile().GetHeader();
        // The following three lines make sure to regenerate any value:
        fmi.Remove( new gdcm.Tag(0x0002,0x0012) );
        fmi.Remove( new gdcm.Tag(0x0002,0x0013) );
        fmi.Remove( new gdcm.Tag(0x0002,0x0016) );

        Writer writer = new Writer();
        writer.SetFileName( outfilename );
        writer.SetFile( fd.GetFile() );
        if( !writer.Write() )
          {
          System.Console.WriteLine( "Could not write: " + outfilename );
          return 1;
          }

        return 0;
        }
    }