exiv2/samples/easyaccess-test.cpp

// SPDX-License-Identifier: GPL-2.0-or-later
// Sample program using high-level metadata access functions

#include <exiv2/exiv2.hpp>
#include <iostream>
#include <iomanip>
#include <cassert>

using EasyAccessFct = Exiv2::ExifData::const_iterator (*)(const Exiv2::ExifData&);

struct EasyAccess {
    const char*   label_;
    EasyAccessFct findFct_;
};

static const EasyAccess easyAccess[] = {
    { "Orientation",          Exiv2::orientation      },
    { "ISO speed",            Exiv2::isoSpeed         },
    { "Date & time original", Exiv2::dateTimeOriginal },
    { "Flash bias",           Exiv2::flashBias        },
    { "Exposure mode",        Exiv2::exposureMode     },
    { "Scene mode",           Exiv2::sceneMode        },
    { "Macro mode",           Exiv2::macroMode        },
    { "Image quality",        Exiv2::imageQuality     },
    { "White balance",        Exiv2::whiteBalance     },
    { "Lens name",            Exiv2::lensName         },
    { "Saturation",           Exiv2::saturation       },
    { "Sharpness",            Exiv2::sharpness        },
    { "Contrast",             Exiv2::contrast         },
    { "Scene capture type",   Exiv2::sceneCaptureType },
    { "Metering mode",        Exiv2::meteringMode     },
    { "Camera make",          Exiv2::make             },
    { "Camera model",         Exiv2::model            },
    { "Exposure time",        Exiv2::exposureTime     },
    { "FNumber",              Exiv2::fNumber          },
    { "Shutter speed value",  Exiv2::shutterSpeedValue },
    { "Aperture value",       Exiv2::apertureValue    },
    { "Brightness value",     Exiv2::brightnessValue  },
    { "Exposure bias",        Exiv2::exposureBiasValue },
    { "Max aperture value",   Exiv2::maxApertureValue },
    { "Subject distance",     Exiv2::subjectDistance  },
    { "Light source",         Exiv2::lightSource      },
    { "Flash",                Exiv2::flash            },
    { "Camera serial number", Exiv2::serialNumber     },
    { "Focal length",         Exiv2::focalLength      },
    { "Subject location/area", Exiv2::subjectArea     },
    { "Flash energy",         Exiv2::flashEnergy      },
    { "Exposure index",       Exiv2::exposureIndex    },
    { "Sensing method",       Exiv2::sensingMethod    },
    { "AF point",             Exiv2::afPoint          }
};

int main(int argc, char **argv)
try {
    Exiv2::XmpParser::initialize();
    ::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
    Exiv2::enableBMFF();
#endif

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

    auto image = Exiv2::ImageFactory::open(argv[1]);
    image->readMetadata();
    Exiv2::ExifData& ed = image->exifData();

    for (auto&& ea : easyAccess) {
        auto pos = ea.findFct_(ed);
        std::cout << std::setw(21) << std::left << ea.label_;
        if (pos != ed.end()) {
            std::cout << " (" << std::setw(35) << pos->key() << ") : "
                      << pos->print(&ed) << "\n";
        }
        else {
            std::cout << " (" << std::setw(35) << " " << ") : \n";
        }
    }

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