Qt 5.6 | Qt QML | C++ Extensions: Network Access Manager Factory Example | main.cpp Example File

Qt 5.6.2 Reference Documentation

# main.cpp Example File

networkaccessmanagerfactory/main.cpp

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      #include <QCommandLineParser>
      #include <QGuiApplication>
      #include <QNetworkAccessManager>
      #include <QNetworkProxy>

      #include <QQmlEngine>
      #include <QQmlNetworkAccessManagerFactory>
      #include <QtQuick/QQuickView>

      /*
         This example illustrates using a QQmlNetworkAccessManagerFactory to
         create a QNetworkAccessManager with a proxy.

         Usage:
           networkaccessmanagerfactory [-host <proxy> -port <port>] [file]
      */

      #ifndef QT_NO_NETWORKPROXY
      static QString proxyHost;
      static int proxyPort = 0;
      #endif // !QT_NO_NETWORKPROXY

      class MyNetworkAccessManagerFactory : public QQmlNetworkAccessManagerFactory
      {
      public:
          virtual QNetworkAccessManager *create(QObject *parent);
      };

      QNetworkAccessManager *MyNetworkAccessManagerFactory::create(QObject *parent)
      {
          QNetworkAccessManager *nam = new QNetworkAccessManager(parent);
      #ifndef QT_NO_NETWORKPROXY
          if (!proxyHost.isEmpty()) {
              qDebug() << "Created QNetworkAccessManager using proxy" << (proxyHost + ":" + QString::number(proxyPort));
              QNetworkProxy proxy(QNetworkProxy::HttpCachingProxy, proxyHost, proxyPort);
              nam->setProxy(proxy);
          }
      #endif // !QT_NO_NETWORKPROXY

          return nam;
      }

      int main(int argc, char ** argv)
      {
          QUrl source("qrc:view.qml");

          QGuiApplication app(argc, argv);

          QCommandLineParser parser;
      #ifndef QT_NO_NETWORKPROXY
          QCommandLineOption proxyHostOption("host", "The proxy host to use.", "host");
          parser.addOption(proxyHostOption);
          QCommandLineOption proxyPortOption("port", "The proxy port to use.", "port", "0");
          parser.addOption(proxyPortOption);
      #endif // !QT_NO_NETWORKPROXY
          parser.addPositionalArgument("file", "The file to use.");
          QCommandLineOption helpOption = parser.addHelpOption();
          parser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);
          QStringList arguments = QCoreApplication::arguments();
          if (!parser.parse(arguments)) {
              qWarning() << parser.helpText() << '\n' << parser.errorText();
              exit(1);
          }
          if (parser.isSet(helpOption)) {
              qWarning() << parser.helpText();
              exit(0);
          }
      #ifndef QT_NO_NETWORKPROXY
          if (parser.isSet(proxyHostOption))
              proxyHost = parser.value(proxyHostOption);
          if (parser.isSet(proxyPortOption)) {
              bool ok = true;
              proxyPort = parser.value(proxyPortOption).toInt(&ok);
              if (!ok || proxyPort < 1 || proxyPort > 65535) {
                  qWarning() << parser.helpText() << "\nNo valid port given. It should\
                                be a number between 1 and 65535";
                  exit(1);
              }
          }
      #endif // !QT_NO_NETWORKPROXY
          if (parser.positionalArguments().count() == 1)
              source = QUrl::fromLocalFile(parser.positionalArguments().first());

          QQuickView view;
          view.engine()->setNetworkAccessManagerFactory(new MyNetworkAccessManagerFactory);

          view.setSource(source);
          view.show();

          return app.exec();
      }