Qt 5.11 | Qt NFC | Annotated URL Example | annotatedurl.cpp Example File

Qt 5.11.3 Reference Documentation

# annotatedurl.cpp Example File

annotatedurl/annotatedurl.cpp

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      #include "annotatedurl.h"

      #include <QtNfc/qnearfieldmanager.h>
      #include <QtNfc/qnearfieldtarget.h>
      #include <QtNfc/qndefmessage.h>
      #include <QtNfc/qndefrecord.h>
      #include <QtNfc/qndefnfctextrecord.h>
      #include <QtNfc/qndefnfcurirecord.h>

      #include <QtWidgets/QGridLayout>
      #include <QtWidgets/QLabel>
      #include <QtGui/QMouseEvent>
      #include <QtGui/QDesktopServices>
      #include <QtCore/QDebug>
      #include <QtCore/QLocale>
      #include <QtCore/QUrl>

      AnnotatedUrl::AnnotatedUrl(QObject *parent)
      :   QObject(parent)
      {
          manager = new QNearFieldManager(this);
          if (!manager->isAvailable()) {
              qWarning() << "NFC not available";
              return;
          }

          QNdefFilter filter;
          filter.setOrderMatch(false);
          filter.appendRecord<QNdefNfcTextRecord>(1, UINT_MAX);
          filter.appendRecord<QNdefNfcUriRecord>();
          // type parameter cannot specify substring so filter for "image/" below
          filter.appendRecord(QNdefRecord::Mime, QByteArray(), 0, 1);

          int result = manager->registerNdefMessageHandler(filter, this,
                                             SLOT(handleMessage(QNdefMessage,QNearFieldTarget*)));

          if (result < 0)
              qWarning() << "Platform does not support NDEF message handler registration";

          manager->startTargetDetection();
          connect(manager, &QNearFieldManager::targetDetected,
                  this, &AnnotatedUrl::targetDetected);
          connect(manager, &QNearFieldManager::targetLost,
                  this, &AnnotatedUrl::targetLost);
      }

      AnnotatedUrl::~AnnotatedUrl()
      {

      }

      void AnnotatedUrl::targetDetected(QNearFieldTarget *target)
      {
          if (!target)
              return;

          connect(target, &QNearFieldTarget::ndefMessageRead,
                  this, &AnnotatedUrl::handlePolledNdefMessage);
          target->readNdefMessages();
      }

      void AnnotatedUrl::targetLost(QNearFieldTarget *target)
      {
          if (target)
              target->deleteLater();
      }

      void AnnotatedUrl::handlePolledNdefMessage(QNdefMessage message)
      {
          QNearFieldTarget *target = qobject_cast<QNearFieldTarget *>(sender());
          handleMessage(message, target);
      }

      void AnnotatedUrl::handleMessage(const QNdefMessage &message, QNearFieldTarget *target)
      {
          Q_UNUSED(target);

          enum {
              MatchedNone,
              MatchedFirst,
              MatchedEnglish,
              MatchedLanguage,
              MatchedLanguageAndCountry
          } bestMatch = MatchedNone;

          QLocale defaultLocale;

          QString title;
          QUrl url;
          QPixmap pixmap;

          foreach (const QNdefRecord &record, message) {
              if (record.isRecordType<QNdefNfcTextRecord>()) {
                  QNdefNfcTextRecord textRecord(record);

                  title = textRecord.text();
                  QLocale locale(textRecord.locale());
                  // already found best match
                  if (bestMatch == MatchedLanguageAndCountry) {
                      // do nothing
                  } else if (bestMatch <= MatchedLanguage && locale == defaultLocale) {
                      bestMatch = MatchedLanguageAndCountry;
                  } else if (bestMatch <= MatchedEnglish &&
                             locale.language() == defaultLocale.language()) {
                      bestMatch = MatchedLanguage;
                  } else if (bestMatch <= MatchedFirst && locale.language() == QLocale::English) {
                      bestMatch = MatchedEnglish;
                  } else if (bestMatch == MatchedNone) {
                      bestMatch = MatchedFirst;
                  }
              } else if (record.isRecordType<QNdefNfcUriRecord>()) {
                  QNdefNfcUriRecord uriRecord(record);

                  url = uriRecord.uri();
              } else if (record.typeNameFormat() == QNdefRecord::Mime &&
                         record.type().startsWith("image/")) {
                  pixmap = QPixmap::fromImage(QImage::fromData(record.payload()));
              }
          }

          emit annotatedUrl(url, title, pixmap);
      }