main.cpp Example File

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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();
  }