Exiv2

#include <exiv2/exiv2.hpp>

#include <iostream>

#include <cassert>

#include <opencv2/highgui/highgui.hpp>

#include <opencv2/imgproc/imgproc.hpp> 

int main(int argc, char* const argv[])

try {

    if (argc != 2) {

        std::cout << "Usage: " << argv[0] << " file\n";

        return 1;

    }

    cv::Mat cvImage = cv::imread(argv[1], CV_LOAD_IMAGE_COLOR);

    //cv::cvtColor(cvImage, cvImage, CV_BGR2RGB);

    //Exiv2::DataBuf buf = Exiv2::readFile(argv[1]);

    //Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(buf.pData_, buf.size_);

    Exiv2::byte * buf = reinterpret_cast<Exiv2::byte *> (cvImage.ptr());

    //std::cout << static_cast<void *> (cvImage.ptr()) << std::endl;

    //std::cout << static_cast<void *> (buf) << std::endl;

    //Exiv2::MemIo memIo(buf, 3921722);

    //std::cout << "Image Type is:" << Exiv2::ImageFactory::getType(buf, 3921722) << std::endl;

    //std::cout << "Image Type is:" << Exiv2::ImageFactory::getType(argv[1]) << std::endl;

    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(buf, 3921722);

    image->readMetadata();

    Exiv2::ExifData &exifData = image->exifData();

    exifData["Exif.Image.Model"] = "A long model name to make the Exif metadata grow";

    image->writeMetadata();

    Exiv2::FileIo file(argv[1]);

    file.open();

    file.write(image->io());

    return 0;

}

catch (Exiv2::Error& e) {

    std::cout << "Caught Exiv2 exception '" << e.what() << "'\n";

    return -1;

}