exiv2/samples/xmpprint.cpp

// ***************************************************************** -*- C++ -*-
// xmpprint.cpp
// Read an XMP from a video or graphic file, parse it and print 
// all (known) properties.
// ========================================================================
// Linux standalone compilation : 
//      g++ -o xmprint xmprint.cpp `pkg-config --cflags --libs exiv2`
// ========================================================================

#include <exiv2/exiv2.hpp>

#include <string>
#include <iostream>
#include <iomanip>
#include <cassert>

int main(int argc, char** argv)
{
try 
  {
    if (argc != 2) 
      {
        std::cout << "Usage: " << argv[0] << " file\n";
        return 1;
      }

    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(argv[1]);
    assert (image.get() != 0);
    image->readMetadata();

    Exiv2::XmpData &xmpData = image->xmpData();
    if (xmpData.empty()) {
        std::string error(argv[1]);
        error += ": No XMP data found in the file";
        throw Exiv2::Error(Exiv2::kerErrorMessage, error);
    }
    if (xmpData.empty()) 
      {
        std::string error(argv[1]);
        error += ": No XMP properties found in the XMP packet";
        throw Exiv2::Error(Exiv2::kerErrorMessage, error);
      }

    for (Exiv2::XmpData::const_iterator md = xmpData.begin();
         md != xmpData.end(); ++md) 
      {
        std::cout << std::setfill(' ') << std::left
                  << std::setw(44)
                  << md->key() << " "
                  << std::setw(9) << std::setfill(' ') << std::left
                  << md->typeName() << " "
                  << std::dec << std::setw(3)
                  << std::setfill(' ') << std::right
                  << md->count() << "  "
                  << std::dec << md->value()
                  << std::endl;
      }

    Exiv2::XmpParser::terminate();

    return 0;
  }
catch (Exiv2::AnyError& e) 
  {
    std::cout << "Caught Exiv2 exception '" << e << "'\n";
    return -1;
  }
}