C++ const_iterator::key方法代码示例

int main(int argc, char* const argv[])
try {
    
    if (argc != 2) {
        std::cout << "Usage: " << argv[0] << " file\n";
        return 1;
    }
    
    const char* path=argv[1];
        
    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(path);
    assert(image.get() != 0);
    image->readMetadata();
        
    Jzon::Object root;

    const char*    FS="FS";
    Jzon::Object      fs  ;
    root.Add      (FS,fs) ;
    fileSystemPush(path,root.Get(FS));
    
	Exiv2::ExifData &exifData = image->exifData();
    for ( ExifData::const_iterator i = exifData.begin(); i != exifData.end() ; ++i ) {
        std::string   key ;
        push(objectForKey(i->key(),key,root),key,i);
    }

	Exiv2::IptcData &iptcData = image->iptcData();
    for (Exiv2::IptcData::const_iterator i = iptcData.begin(); i != iptcData.end(); ++i) {
        std::string key ;
        push(objectForKey(i->key(),key,root),key,i);
    }

	Exiv2::XmpData  &xmpData  = image->xmpData();
    for (Exiv2::XmpData::const_iterator i = xmpData.begin(); i != xmpData.end(); ++i) {
        std::string key ;
        push(objectForKey(i->key(),key,root),key,i);
    }
/*
    This is only for testing long paths    
    {
    	ExifData::const_iterator i = exifData.begin();
    	std::string key;
    	push(objectForKey("This.Is.A.Rather.Long.Path.Key",key,root),key,i);
    }
*/        
    Jzon::Writer writer(root,Jzon::StandardFormat);
    writer.Write();
    std::cout << writer.GetResult() << std::endl;
    return 0;
}
        
//catch (std::exception& e) {
//catch (Exiv2::AnyError& e) {
catch (Exiv2::Error& e) {
    std::cout << "Caught Exiv2 exception '" << e.what() << "'\n";
    return -1;
}

    ExifData::const_iterator isoSpeed(const ExifData& ed)
    {
        static const char* keys[] = {
            "Exif.Photo.ISOSpeedRatings",
            "Exif.Image.ISOSpeedRatings",
            "Exif.CanonSi.ISOSpeed",
            "Exif.CanonCs.ISOSpeed",
            "Exif.Nikon1.ISOSpeed",
            "Exif.Nikon2.ISOSpeed",
            "Exif.Nikon3.ISOSpeed",
            "Exif.NikonIi.ISO",
            "Exif.NikonIi.ISO2",
            "Exif.MinoltaCsNew.ISOSetting",
            "Exif.MinoltaCsOld.ISOSetting",
            "Exif.MinoltaCs5D.ISOSpeed",
            "Exif.MinoltaCs7D.ISOSpeed",
            "Exif.Sony1Cs.ISOSetting",
            "Exif.Sony2Cs.ISOSetting",
            "Exif.Sony1Cs2.ISOSetting",
            "Exif.Sony2Cs2.ISOSetting",
            "Exif.Sony1MltCsA100.ISOSetting",
            "Exif.Pentax.ISO",
            "Exif.PentaxDng.ISO",
            "Exif.Olympus.ISOSpeed",
            "Exif.Samsung2.ISO",
            "Exif.Casio.ISO",
            "Exif.Casio2.ISO",
            "Exif.Casio2.ISOSpeed"
        };

        // Find the first ISO value which is not "0"
        const int cnt = EXV_COUNTOF(keys);
        ExifData::const_iterator md = ed.end();
        for (int idx = 0; idx < cnt; ) {
            md = findMetadatum(ed, keys + idx, cnt - idx);
            if (md == ed.end()) break;
            std::ostringstream os;
            md->write(os, &ed);
            bool ok = false;
            long v = parseLong(os.str(), ok);
            if (ok && v != 0) break;
            while (strcmp(keys[idx++], md->key().c_str()) != 0 && idx < cnt) {}
            md = ed.end();
        }

        return md;
    }

void exifPrint(const ExifData& exifData)
{
    ExifData::const_iterator i = exifData.begin();
    for (; i != exifData.end(); ++i) {
        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
                  << i->typeName() << " "
                  << std::dec << std::setw(3)
                  << std::setfill(' ') << std::right
                  << i->count() << "  "
                  << std::dec << i->value()
                  << "\n";
    }
}

    void Rw2Image::readMetadata()
    {
#ifdef DEBUG
        std::cerr << "Reading RW2 file " << io_->path() << "\n";
#endif
        if (io_->open() != 0) {
            throw Error(9, io_->path(), strError());
        }
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isRw2Type(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(3, "RW2");
        }
        clearMetadata();
        std::ofstream devnull;
        printStructure(devnull, kpsRecursive, 0);
        ByteOrder bo = Rw2Parser::decode(exifData_,
                                         iptcData_,
                                         xmpData_,
                                         io_->mmap(),
                                         io_->size());
        setByteOrder(bo);

        // A lot more metadata is hidden in the embedded preview image
        // Todo: This should go into the Rw2Parser, but for that it needs the Image
        PreviewManager loader(*this);
        PreviewPropertiesList list = loader.getPreviewProperties();
        // Todo: What if there are more preview images?
        if (list.size() > 1) {
#ifndef SUPPRESS_WARNINGS
            EXV_WARNING << "RW2 image contains more than one preview. None used.\n";
#endif
        }
        if (list.size() != 1) return;
        ExifData exifData;
        PreviewImage preview = loader.getPreviewImage(*list.begin());
        Image::AutoPtr image = ImageFactory::open(preview.pData(), preview.size());
        if (image.get() == 0) {
#ifndef SUPPRESS_WARNINGS
            EXV_WARNING << "Failed to open RW2 preview image.\n";
#endif
            return;
        }
        image->readMetadata();
        ExifData& prevData = image->exifData();
        if (!prevData.empty()) {
            // Filter duplicate tags
            for (ExifData::const_iterator pos = exifData_.begin(); pos != exifData_.end(); ++pos) {
                if (pos->ifdId() == panaRawId) continue;
                ExifData::iterator dup = prevData.findKey(ExifKey(pos->key()));
                if (dup != prevData.end()) {
#ifdef DEBUG
                    std::cerr << "Filtering duplicate tag " << pos->key()
                              << " (values '" << pos->value()
                              << "' and '" << dup->value() << "')\n";
#endif
                    prevData.erase(dup);
                }
            }
        }
        // Remove tags not applicable for raw images
        static const char* filteredTags[] = {
            "Exif.Photo.ComponentsConfiguration",
            "Exif.Photo.CompressedBitsPerPixel",
            "Exif.Panasonic.ColorEffect",
            "Exif.Panasonic.Contrast",
            "Exif.Panasonic.NoiseReduction",
            "Exif.Panasonic.ColorMode",
            "Exif.Panasonic.OpticalZoomMode",
            "Exif.Panasonic.Contrast",
            "Exif.Panasonic.Saturation",
            "Exif.Panasonic.Sharpness",
            "Exif.Panasonic.FilmMode",
            "Exif.Panasonic.SceneMode",
            "Exif.Panasonic.WBRedLevel",
            "Exif.Panasonic.WBGreenLevel",
            "Exif.Panasonic.WBBlueLevel",
            "Exif.Photo.ColorSpace",
            "Exif.Photo.PixelXDimension",
            "Exif.Photo.PixelYDimension",
            "Exif.Photo.SceneType",
            "Exif.Photo.CustomRendered",
            "Exif.Photo.DigitalZoomRatio",
            "Exif.Photo.SceneCaptureType",
            "Exif.Photo.GainControl",
            "Exif.Photo.Contrast",
            "Exif.Photo.Saturation",
            "Exif.Photo.Sharpness",
            "Exif.Image.PrintImageMatching",
            "Exif.Image.YCbCrPositioning"
        };
        for (unsigned int i = 0; i < EXV_COUNTOF(filteredTags); ++i) {
            ExifData::iterator pos = prevData.findKey(ExifKey(filteredTags[i]));
            if (pos != prevData.end()) {
#ifdef DEBUG
                std::cerr << "Exif tag " << pos->key() << " removed\n";
#endif
                prevData.erase(pos);
            }
//.........这里部分代码省略.........