C++ const_iterator::key方法代码示例

void print(const std::string& file)
{
    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(file);
    assert(image.get() != 0);
    image->readMetadata();

    Exiv2::ExifData &ed = image->exifData();
    Exiv2::ExifData::const_iterator end = ed.end();
    for (Exiv2::ExifData::const_iterator i = ed.begin(); i != end; ++i) {
        std::cout << std::setw(45) << std::setfill(' ') << std::left
                  << i->key() << " "
                  << "0x" << std::setw(4) << std::setfill('0') << std::right
                  << std::hex << i->tag() << " "
                  << std::setw(12) << std::setfill(' ') << std::left
                  << i->ifdName() << " "
                  << 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";

    }
}

QString exifDataToString(Exiv2::ExifData exifData) {
    if (exifData.empty()) {
        return QString(QObject::tr("No EXIF found"));
    }
    try {
        Exiv2::ExifData::const_iterator end = exifData.end();
        QString tmpExif, final;
        for (Exiv2::ExifData::const_iterator i = exifData.begin(); i != end; ++i) {
            const char* tn = i->typeName();
            /*std::string str = 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";*/
            tmpExif = "<span style='color:#1cb495;'>" + QString::fromStdString(i->key()).split(".").at(2) + "</span>&emsp;" +
                      //QString::number(i->tag()) + "\t" +
                      //(tn ? tn : "Unknown") + "\t" +
                      //QString::number(i->count()) + "\t" +
                      QString::fromStdString(i->value().toString()) + "<br />";
            final.append(tmpExif);
        }
        return final;
    } catch(Exiv2::Error& e) {

void print(const std::string& file)
{
    Exiv2::ExifData ed;
    int rc = ed.read(file);
    if (rc) {
        std::string error = Exiv2::ExifData::strError(rc, file);
        throw Exiv2::Error(error);
    }

    Exiv2::ExifData::const_iterator end = ed.end();
    for (Exiv2::ExifData::const_iterator i = ed.begin(); i != end; ++i) {
        std::cout << std::setw(45) << std::setfill(' ') << std::left
                  << i->key() << " "
                  << "0x" << std::setw(4) << std::setfill('0') << std::right
                  << std::hex << i->tag() << " " 
                  << std::setw(12) << std::setfill(' ') << std::left
                  << i->ifdName() << " "
                  << 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 print(const ExifData& exifData)
{
    if (exifData.empty()) {
        std::string error("No Exif data found in the file");
        throw Exiv2::Error(1, error);
    }
    Exiv2::ExifData::const_iterator end = exifData.end();
    for (Exiv2::ExifData::const_iterator i = exifData.begin(); i != 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 exiv2_dump_tags(const ExifData& exif)
{
	cout <<  "exiv2_dump_tags: " << endl;
	
	Exiv2::ExifData::const_iterator end = exif.end();
	
    for (Exiv2::ExifData::const_iterator i = exif.begin(); i != 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";
    }
}

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

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

    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(argv[1]);
    if (image.get() == 0) {
        std::string error(argv[1]);
        error += " : Could not read file or unknown image type";
        throw Exiv2::Error(error);
    }

    // Load existing metadata
    int rc = image->readMetadata();
    if (rc) {
        std::string error = Exiv2::Image::strError(rc, argv[1]);
        throw Exiv2::Error(error);
    }

    Exiv2::ExifData &exifData = image->exifData();
    Exiv2::ExifData::const_iterator end = exifData.end();
    for (Exiv2::ExifData::const_iterator i = exifData.begin(); i != end; ++i) {
        std::cout << std::setw(53) << std::setfill(' ') << std::left
                  << i->key() << " "
                  << "0x" << std::setw(4) << std::setfill('0') << std::right
                  << std::hex << i->tag() << "  " 
                  << std::dec << i->value() 
                  << "\n";
    }

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

EXIVSIMPLE_API int EnumMeta(HIMAGE img, METAENUMPROC proc, void *user)
{
    assert(img && proc);
    if (img==0 || proc==0) return -1;
    ImageWrapper *imgWrap = (ImageWrapper*)img;
    bool more = true;

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

    Exiv2::IptcData::const_iterator iend = iptcData.end();
    for (Exiv2::IptcData::const_iterator i = iptcData.begin(); 
            i != iend && more; ++i) {
        more = proc(i->key().c_str(), i->value().toString().c_str(), user);
    }

    Exiv2::ExifData::const_iterator eend = exifData.end();
    for (Exiv2::ExifData::const_iterator e = exifData.begin();
            e != eend && more; ++e) {
        more = proc(e->key().c_str(), e->value().toString().c_str(), user);
    }

    return 0;
}

void scan_exiv2(const class scanner_params &sp,const recursion_control_block &rcb)
{
    assert(sp.sp_version==scanner_params::CURRENT_SP_VERSION);
    if(sp.phase==scanner_params::PHASE_STARTUP){
        assert(sp.info->si_version==scanner_info::CURRENT_SI_VERSION);
	sp.info->name  = "exiv2";
        sp.info->author         = "Simson L. Garfinkel";
        sp.info->description    = "Searches for EXIF information using exiv2";
        sp.info->scanner_version= "1.0";
	sp.info->feature_names.insert("exif");
	sp.info->feature_names.insert("gps");
	sp.info->flags = scanner_info::SCANNER_DISABLED; // disabled because we have be_exif
	return;
    }
    if(sp.phase==scanner_params::PHASE_SHUTDOWN) return;
    if(sp.phase==scanner_params::PHASE_SCAN){

	const sbuf_t &sbuf = sp.sbuf;
	feature_recorder *exif_recorder = sp.fs.get_name("exif");
	feature_recorder *gps_recorder  = sp.fs.get_name("gps");

#ifdef HAVE_EXIV2__LOGMSG__SETLEVEL
	/* New form to suppress error messages on exiv2 */
	Exiv2::LogMsg::setLevel(Exiv2::LogMsg::mute);
#endif    

	size_t pos_max = 1;		// by default, just scan 1 byte
	if(sbuf.bufsize > min_exif_size){
	    pos_max = sbuf.bufsize - min_exif_size; //  we can scan more!
	}
    
	/* Loop through all possible locations in the buffer */
	for(size_t pos=0;pos<pos_max;pos++){
	    size_t count = exif_gulp_size;
	    count = min(count,sbuf.bufsize-pos);
	    //size_t count = sbuf.bufsize-pos; // use all to end

	    /* Explore the beginning of each 512-byte block as well as the starting location
	     * of any JPEG on any boundary. This will cause processing of any multimedia file
	     * that Exiv2 recognizes (for which I do not know all the headers.
	     */
	    if(pos%512==0 || jpeg_start(sbuf+pos)){
		try {
		    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(sbuf.buf+pos,count);
		    if(image->good()){
			image->readMetadata();
		    
			Exiv2::ExifData &exifData = image->exifData();
			if (exifData.empty()) continue;
		    
			/*
			 * Create the MD5 of the first 4K to use as a unique identifier.
			 */
			sbuf_t tohash(sbuf,0,4096);
			string md5_hex = exif_recorder->fs.hasher.func(tohash.buf,tohash.bufsize);

			char xmlbuf[1024];
			snprintf(xmlbuf,sizeof(xmlbuf),
				 "<exiv2><width>%d</width><height>%d</height>",
				 image->pixelWidth(),image->pixelHeight());

			/* Scan through the fields reported by exiv2.
			 * Create XML for each and extract GPS information if present.
			 */
			string photo_time;	// use this when gps_time is not available
			string gps_time;
			string gps_date;
			string gps_lat_ref;
			string gps_lat;
			string gps_lon_ref;
			string gps_lon;
			string gps_ele;
			string gps_speed;
			string gps_course;

                        bool has_gps = false;
                        bool has_gps_date = false;

			string xml = xmlbuf;
			for (Exiv2::ExifData::const_iterator i = exifData.begin();
			    i != exifData.end(); ++i) {

			    if(i->count()>1000) continue;	// ignore long ones

			    string key = string(i->key());
			    xml.append("<"+key+">"+dfxml_writer::xmlescape(i->value().toString())+"</"+key+">");

                            // use Date from Photo unless date from GPS is available
			    if(key=="Exif.Photo.DateTimeOriginal"){
				photo_time = i->value().toString();

				/* change "2011/06/25 12:20:11" to "2011-06-25 12:20:11" */
				std::transform(photo_time.begin(),photo_time.end(),photo_time.begin(),slash_to_dash);

				/* change "2011:06:25 12:20:11" to "2011-06-25 12:20:11" */
                                if (photo_time[4] == ':') {
                                    photo_time[4] = '-';
                                }
                                if (photo_time[7] == ':') {
                                    photo_time[7] = '-';
//.........这里部分代码省略.........

/** \fn     ImageUtils::GetAllExifValues(const QString &)
 *  \brief  Reads and returns all non empty tags from the given file
 *  \param  fileName The filename that holds the exif data
 *  \return The list of exif tag names and values
 */
QList<QStringList> ImageUtils::GetAllExifValues(const QString &fileName)
{
    // default value, an empty list means no
    // exif tags were found or an error occured
    QList<QStringList> valueList;

    try
    {
        Exiv2::Image::AutoPtr image =
                Exiv2::ImageFactory::open(fileName.toLocal8Bit().constData());

        if (image.get())
        {
            image->readMetadata();
            Exiv2::ExifData &exifData = image->exifData();
            if (!exifData.empty())
            {
                LOG(VB_GENERAL, LOG_DEBUG,
                    QString("Found %1 tag(s) for file %2")
                    .arg(exifData.count())
                    .arg(fileName));

                Exiv2::ExifData::const_iterator end = exifData.end();
                Exiv2::ExifData::const_iterator i = exifData.begin();
                for (; i != end; ++i)
                {
                    QString value = QString::fromStdString(i->value().toString());

                    // Do not add empty tags to the list
                    if (!value.isEmpty())
                    {
                        QStringList values;

                        // These three are the same as i->key()
                        values.append(QString::fromStdString(i->familyName()));
                        values.append(QString::fromStdString(i->groupName()));
                        values.append(QString::fromStdString(i->tagName()));
                        values.append(QString::fromStdString(i->key()));
                        values.append(QString::fromStdString(i->tagLabel()));
                        values.append(QString::fromStdString(i->value().toString()));

                        // Add the exif information to the list
                        valueList.append(values);
                    }
                }
            }
            else
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Exiv2 error: No header, file %1")
                    .arg(fileName));
            }
        }
        else
        {
            LOG(VB_GENERAL, LOG_ERR,
                QString("Exiv2 error: Could not open file, file %1")
                .arg(fileName));
        }
    }
    catch (Exiv2::Error& e)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("Exiv2 exception %1, file %2")
            .arg(e.what()).arg(fileName));
    }

    return valueList;
}

JSONNODE *ImgTagJson::genLitExif(const Exiv2::Image::AutoPtr & image)
{
    //const Exiv2::ExifData &data = image->exifData();
    Exiv2::ExifData &data = image->exifData();
    data.sortByKey();

    if (data.empty()) return NULL;

    Exiv2::ExifData::const_iterator end = data.end();

    JMAP *grpmap = new JMAP();

    JSONNODE *tree = json_new(JSON_NODE);
    json_set_name(tree, "exif");
    for (Exiv2::ExifData::const_iterator i = data.begin(); i != end; i++)
    {
        JSONNODE *grp;

        if (grpmap->find(i->groupName()) == grpmap->end())
        {
            grp = json_new(JSON_NODE);
            json_set_name(grp, i->groupName().c_str());
            grpmap->insert(JMAP::value_type(i->groupName(), grp)); 
        }
        else
           grp = (grpmap->find(i->groupName()))->second;

        Exiv2::ExifData::const_iterator nxt = i;
        nxt++;
        if ((nxt != data.end()) && (i->key() == nxt->key()))
        {
            //cout << "Array Elem! " << i->key() << endl;
            JSONNODE *arr = json_new(JSON_ARRAY);
            json_set_name(arr, i->tagName().c_str());
            json_push_back(arr, json_new_a((i->tagName()).c_str(),
                (i->print()).c_str()));

            while ((nxt != data.end()) && (nxt->key() == i->key()))
            {
                json_push_back(arr, json_new_a((nxt->tagName()).c_str(),
                    (nxt->print()).c_str()));
                nxt++;
            }
            json_push_back(grp, arr);
            if (nxt == data.end()) break;
            nxt--;
            i = nxt;
        }
        else
        {
            json_push_back(grp, json_new_a((i->tagName()).c_str(),
                (i->print()).c_str()));
        }
    }
    JMAP::iterator it;
    for(it = grpmap->begin(); it != grpmap->end(); it++)
    {
        json_push_back(tree, it->second);
        grpmap->erase(it);
    }
        //cout << it->first << endl;
    delete grpmap;
    //cout << json_write_formatted(tree) << endl;
    return tree;
}

void Tag_Handler::parseTag()
{
    if(!gps_from_filename)
        gps_found = false;

    Exiv2::ExifData::const_iterator end = exif_data->end();

    for(Exiv2::ExifData::const_iterator i = exif_data->begin(); i != end; ++i)
    {
        if(0)//(dumpAllExif)
        {
            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";
        }

        if(i->key() == "Exif.GPSInfo.GPSLatitude" && !gps_from_filename)
        {
            gps.lat_ratio = QString::fromStdString(i->value().toString());
            convert_degMinSec(gps.lat_ratio, gps.lat_coord);
            gps.lat_coord.dec_form = getDecForm(gps.lat_coord, gps.lat_coord.ref);
            gps_found = true;
        }
        else if(i->key() == "Exif.GPSInfo.GPSLongitude" && !gps_from_filename)
        {
            gps.long_ratio = QString::fromStdString(i->value().toString());
            convert_degMinSec(gps.long_ratio, gps.long_coord);
            gps.long_coord.dec_form = getDecForm(gps.long_coord, gps.long_coord.ref);

            gps_found = true;
        }
        else if(i->key() == "Exif.GPSInfo.GPSLatitudeRef" && !gps_from_filename)
        {
            gps.lat_coord.ref = QString::fromStdString(i->value().toString());
        }
        else if(i->key() == "Exif.GPSInfo.GPSLongitudeRef" && !gps_from_filename)
        {
            gps.long_coord.ref = QString::fromStdString(i->value().toString());
        }
        else if(i->key() == "Exif.Photo.UserComment")
        {
            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";

            //need to reset user comment if hasn't been set before
            if(i->count() == 264)
            {
                 (*exif_data)["Exif.Photo.UserComment"] = "";
                  image->writeMetadata();
            }
        }
    }

    if(!gps_found)
    {
        clearGPSdata(gps);
    }
}

QVariantMap QgsExifTools::readTags( const QString &imagePath )
{
  std::unique_ptr< Exiv2::Image > image( Exiv2::ImageFactory::open( imagePath.toStdString() ) );
  if ( !image )
    return QVariantMap();

  image->readMetadata();
  Exiv2::ExifData &exifData = image->exifData();
  if ( exifData.empty() )
  {
    return QVariantMap();
  }

  QVariantMap res;
  Exiv2::ExifData::const_iterator end = exifData.end();
  for ( Exiv2::ExifData::const_iterator i = exifData.begin(); i != end; ++i )
  {
    const QString key = QString::fromStdString( i->key() );
    QVariant val;
    switch ( i->typeId() )
    {
      case Exiv2::asciiString:
      case Exiv2::string:
      case Exiv2::comment:
      case Exiv2::directory:
      case Exiv2::xmpText:
        val = QString::fromStdString( i->toString() );
        break;

      case Exiv2::unsignedLong:
      case Exiv2::signedLong:
        val = QVariant::fromValue( i->toLong() );
        break;

      case Exiv2::tiffDouble:
      case Exiv2::tiffFloat:
        val = QVariant::fromValue( i->toFloat() );
        break;

      case Exiv2::unsignedShort:
      case Exiv2::signedShort:
        val = QVariant::fromValue( static_cast< int >( i->toLong() ) );
        break;

      case Exiv2::unsignedRational:
      case Exiv2::signedRational:
      case Exiv2::unsignedByte:
      case Exiv2::signedByte:
      case Exiv2::undefined:
      case Exiv2::tiffIfd:
      case Exiv2::date:
      case Exiv2::time:
      case Exiv2::xmpAlt:
      case Exiv2::xmpBag:
      case Exiv2::xmpSeq:
      case Exiv2::langAlt:
      case Exiv2::invalidTypeId:
      case Exiv2::lastTypeId:
        val = QString::fromStdString( i->toString() );
        break;

    }

    res.insert( key, val );
  }
  return res;
}