How to run gdcm examples in ubuntu?

Question

I am trying to run this simple example in GDCM. I have installed the library c++ version and the installation works perfectly fine but I am not able to figure out how to compile and run a example.

#include "gdcmReader.h"
#include "gdcmWriter.h"
#include "gdcmAttribute.h"

#include <iostream>

int main(int argc, char *argv[])
{
  if( argc < 3 )
    {
    std::cerr << argv[0] << " input.dcm output.dcm" << std::endl;
    return 1;
    }
  const char *filename = argv[1];
  const char *outfilename = argv[2];

  // Instanciate the reader:
  gdcm::Reader reader;
  reader.SetFileName( filename );
  if( !reader.Read() )
    {
    std::cerr << "Could not read: " << filename << std::endl;
    return 1;
    }

  // If we reach here, we know for sure only 1 thing:
  // It is a valid DICOM file (potentially an old ACR-NEMA 1.0/2.0 file)
  // (Maybe, it's NOT a Dicom image -could be a DICOMDIR, a RTSTRUCT, etc-)

  // The output of gdcm::Reader is a gdcm::File
  gdcm::File &file = reader.GetFile();

  // the dataset is the the set of element we are interested in:
  gdcm::DataSet &ds = file.GetDataSet();

  // Contruct a static(*) type for Image Comments :
  gdcm::Attribute<0x0020,0x4000> imagecomments;
  imagecomments.SetValue( "Hello, World !" );

  // Now replace the Image Comments from the dataset with our:
  ds.Replace( imagecomments.GetAsDataElement() );

  // Write the modified DataSet back to disk
  gdcm::Writer writer;
  writer.CheckFileMetaInformationOff(); // Do not attempt to reconstruct the file meta to preserve the file
                                        // as close to the original as possible.
  writer.SetFileName( outfilename );
  writer.SetFile( file );
  if( !writer.Write() )
    {
    std::cerr << "Could not write: " << outfilename << std::endl;
    return 1;
    }

  return 0;
}

/*
 * (*) static type, means that extra DICOM information VR & VM are computed at compilation time.
 * The compiler is deducing those values from the template arguments of the class.
 */

It has a few header files that it is looking for namely gdcmreader, gdcmwriter and I want to figure out the compiler flags to use to be able to run this file.
I am doing g++ a.cpp -lgdcmCommon -lgdcmDICT but that gives me the error

a.cpp:18:24: fatal error: gdcmReader.h: No such file or directory
compilation terminated.

Can you please help me out? I have searched everywhere but I can't seem to figure out how to run this file.

`#include "myfile.h"` is not the same as `#include `. Also, g++ needs to know where GDCM libs (`.so`) are. — Ripi2, Jun 08 '18 at 18:49
I did changed all commas to < and > respectively. All the .a files are in the /usr/local/lib — ArafatK, Jun 08 '18 at 18:56

score 1 · Answer 1 · answered Jun 08 '18 at 19:12

When using files that are in different locations of your "normal" files you must instruct the compiler and the linker how to find them.

Your code has a #include <someFile.h> command.
The <> usage means "in other path". The compiler already knows common "other paths" as for "stdio" for common libraries.
In case of "not normal", you can tell g++ where to find the headers by adding -Imydir to the command line (replace 'mydir' with the proper path)

For the libraries, static (.a) or dynamic (.so) the same history stands.
The -Lmydir tells g++ where to look for libraries.

Your command line may look like

g++ a.cpp -I/usr/include -L/usr/local/lib -lgdcmCommon -lgdcmDICT

I tried using that command too but it didn't work. The output remains the same and yes I am replacing my dir with the directory — ArafatK, Jun 08 '18 at 19:13
Find where GDCM headers and libs are. The replace the paths in the command line. — Ripi2, Jun 08 '18 at 19:15

score 1 · Answer 2 · answered Jun 11 '18 at 07:47

You did not tell how did you install gdcm library, I assume that using apt system. There are two types of libraries, "normal" and "developer" ones. To be able to compile your own software, you need the latter. So, for example in Ubuntu 16.04, type apt-get install libgdcm2-dev. Then all necessary headers will be installed in /usr/include/gdcm-2.6.

How to run gdcm examples in ubuntu?

2 Answers2