exifprint.cpp

Sample program to print Exif data from an image.

// ***************************************************************** -*- C++ -*-
// exifprint.cpp
// Sample program to print the Exif metadata of an image

#include <exiv2/exiv2.hpp>

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

// https://github.com/Exiv2/exiv2/issues/468
#if defined(EXV_UNICODE_PATH) && defined(__MINGW__)
#undef  EXV_UNICODE_PATH
#endif

#ifdef  EXV_UNICODE_PATH
#define _tchar      wchar_t
#define _tstrcmp    wcscmp
#define _t(s)       L##s
#define _tcout      wcout
#define _tmain      wmain
#else
#define _tchar      char
#define _tstrcmp    strcmp
#define _t(s)       s
#define _tcout      cout
#define _tmain      main
#endif

int _tmain(int argc, _tchar* const argv[])
try {
    const _tchar* prog = argv[0];
    const _tchar* file = argv[1];

    if (argc != 2) {
        std::_tcout << _t("Usage: ") << prog << _t(" [ file | --version || --version-test ]") << std::endl;
        return 1;
    }

    if ( _tstrcmp(file,_t("--version")) == 0 ) {
        exv_grep_keys_t keys;
        Exiv2::dumpLibraryInfo(std::cout,keys);
        return 0;
    } else if ( _tstrcmp(file,_t("--version-test")) == 0 ) {
        // verifies/test macro EXIV2_TEST_VERSION
        // described in include/exiv2/version.hpp
        std::cout << "EXV_PACKAGE_VERSION             " << EXV_PACKAGE_VERSION             << std::endl
                  << "Exiv2::version()                " << Exiv2::version()                << std::endl
                  << "strlen(Exiv2::version())        " << ::strlen(Exiv2::version())      << std::endl
                  << "Exiv2::versionNumber()          " << Exiv2::versionNumber()          << std::endl
                  << "Exiv2::versionString()          " << Exiv2::versionString()          << std::endl
                  << "Exiv2::versionNumberHexString() " << Exiv2::versionNumberHexString() << std::endl
                  ;

        // Test the Exiv2 version available at runtime but compile the if-clause only if
        // the compile-time version is at least 0.15. Earlier versions didn't have a
        // testVersion() function:
        #if EXIV2_TEST_VERSION(0,15,0)
            if (Exiv2::testVersion(0,13,0)) {
              std::cout << "Available Exiv2 version is equal to or greater than 0.13\n";
            } else {
              std::cout << "Installed Exiv2 version is less than 0.13\n";
            }
        #else
              std::cout << "Compile-time Exiv2 version doesn't have Exiv2::testVersion()\n";
        #endif
        return 0;
    }

    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(file);
    assert(image.get() != 0);
    image->readMetadata();

    Exiv2::ExifData &exifData = image->exifData();
    if (exifData.empty()) {
        std::string error("No Exif data found in file");
        throw Exiv2::Error(Exiv2::kerErrorMessage, error);
    }

    Exiv2::ExifData::const_iterator end = exifData.end();
    for (Exiv2::ExifData::const_iterator i = exifData.begin(); i != end; ++i) {
        const char* tn = i->typeName();
        std::cout << std::setw(44) << std::setfill(' ') << std::left
                  << i->key() << " "
                  << "0x" << std::setw(4) << std::setfill('0') << std::right
                  << std::hex << i->tag() << " "
                  << std::setw(9) << std::setfill(' ') << std::left
                  << (tn ? tn : "Unknown") << " "
                  << std::dec << std::setw(3)
                  << std::setfill(' ') << std::right
                  << i->count() << "  "
                  << std::dec << i->value()
                  << "\n";
    }

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