Exiv2::Value* kmdValueToExivXmpValue(const KisMetaData::Value& value) { //Q_ASSERT(value.type() != KisMetaData::Value::Structure); switch (value.type()) { case KisMetaData::Value::Invalid: return new Exiv2::DataValue(Exiv2::invalidTypeId); case KisMetaData::Value::Variant: { QVariant var = value.asVariant(); if (var.type() == QVariant::Bool) { if (var.toBool()) { return new Exiv2::XmpTextValue("True"); } else { return new Exiv2::XmpTextValue("False"); } } else { //Q_ASSERT(var.canConvert(QVariant::String)); return new Exiv2::XmpTextValue(var.toString().toLatin1().constData()); } } case KisMetaData::Value::Rational: { QString rat = "%1 / %2"; rat = rat.arg(value.asRational().numerator); rat = rat.arg(value.asRational().denominator); return new Exiv2::XmpTextValue(rat.toLatin1().constData()); } case KisMetaData::Value::AlternativeArray: case KisMetaData::Value::OrderedArray: case KisMetaData::Value::UnorderedArray: { Exiv2::XmpArrayValue* arrV = new Exiv2::XmpArrayValue; switch (value.type()) { case KisMetaData::Value::OrderedArray: arrV->setXmpArrayType(Exiv2::XmpValue::xaSeq); break; case KisMetaData::Value::UnorderedArray: arrV->setXmpArrayType(Exiv2::XmpValue::xaBag); break; case KisMetaData::Value::AlternativeArray: arrV->setXmpArrayType(Exiv2::XmpValue::xaAlt); break; default: // Cannot happen ; } Q_FOREACH (const KisMetaData::Value& v, value.asArray()) { Exiv2::Value* ev = kmdValueToExivXmpValue(v); if (ev) { arrV->read(ev->toString()); delete ev; } } return arrV; } case KisMetaData::Value::LangArray: { Exiv2::Value* arrV = new Exiv2::LangAltValue; QMap<QString, KisMetaData::Value> langArray = value.asLangArray(); for (QMap<QString, KisMetaData::Value>::iterator it = langArray.begin(); it != langArray.end(); ++it) { QString exivVal; if (it.key() != "x-default") { exivVal = "lang=" + it.key() + ' '; } //Q_ASSERT(it.value().type() == KisMetaData::Value::Variant); QVariant var = it.value().asVariant(); //Q_ASSERT(var.type() == QVariant::String); exivVal += var.toString(); arrV->read(exivVal.toLatin1().constData()); } return arrV; } case KisMetaData::Value::Structure: default: { warnKrita << "KisExiv2: Unhandled value type"; return 0; } } warnKrita << "KisExiv2: Unhandled value type"; return 0; }
// ***************************************************************************** // Main int main() try { // Container for all metadata Exiv2::ExifData exifData; // ************************************************************************* // Add to the Exif data // Create a ASCII string value (note the use of create) Exiv2::Value* v = Exiv2::Value::create(Exiv2::asciiString); // Set the value to a string v->read("1999:12:31 23:59:59"); // Add the value together with its key to the Exif data container Exiv2::ExifKey key("Exif.Photo.DateTimeOriginal"); exifData.add(key, v); std::cout << "Added key \"" << key << "\", value \"" << *v << "\"\n"; // Delete the memory allocated by Value::create delete v; // Now create a more interesting value (without using the create method) Exiv2::URationalValue* rv = new Exiv2::URationalValue; // Set two rational components from a string rv->read("1/2 1/3"); // Add more elements through the extended interface of rational value rv->value_.push_back(std::make_pair(2,3)); rv->value_.push_back(std::make_pair(3,4)); // Add the key and value pair to the Exif data key = Exiv2::ExifKey("Exif.Image.PrimaryChromaticities"); exifData.add(key, rv); std::cout << "Added key \"" << key << "\", value \"" << *rv << "\"\n"; // Delete memory allocated on the heap delete rv; // ************************************************************************* // Modify Exif data // Find the timestamp metadatum by its key key = Exiv2::ExifKey("Exif.Photo.DateTimeOriginal"); Exiv2::ExifData::iterator pos = exifData.findKey(key); if (pos == exifData.end()) throw Exiv2::Error("Key not found"); // Modify the value std::string date = pos->toString(); date.replace(0,4,"2000"); pos->setValue(date); std::cout << "Modified key \"" << key << "\", new value \"" << pos->value() << "\"\n"; // Find the other key key = Exiv2::ExifKey("Exif.Image.PrimaryChromaticities"); pos = exifData.findKey(key); if (pos == exifData.end()) throw Exiv2::Error("Key not found"); // Get a pointer to a copy of the value v = pos->getValue(); // Downcast the Value pointer to its actual type rv = dynamic_cast<Exiv2::URationalValue*>(v); if (rv == 0) throw Exiv2::Error("Downcast failed"); // Modify the value directly through the interface of URationalValue rv->value_[2] = std::make_pair(88,77); // Copy the modified value back to the metadatum pos->setValue(rv); // Delete the memory allocated by getValue delete v; std::cout << "Modified key \"" << key << "\", new value \"" << pos->value() << "\"\n"; // ************************************************************************* // Delete metadata from the Exif data container // Delete the metadatum at iterator position pos key = Exiv2::ExifKey("Exif.Image.PrimaryChromaticities"); pos = exifData.findKey(key); if (pos == exifData.end()) throw Exiv2::Error("Key not found"); exifData.erase(pos); std::cout << "Deleted key \"" << key << "\"\n"; // ************************************************************************* // Finally, write the remaining Exif data to an image file int rc = exifData.write("img_2158.jpg"); if (rc) { std::string error = Exiv2::ExifData::strError(rc, "img_2158.jpg"); throw Exiv2::Error(error); } return 0; } catch (Exiv2::Error& e) { std::cout << "Caught Exiv2 exception '" << e << "'\n"; return -1; }