Qt 5.6 | Qt Location | Map Viewer (QML) | main.cpp Example File

Qt 5.6.3 Reference Documentation

# main.cpp Example File

mapviewer/main.cpp

      /****************************************************************************
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      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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      #include <QtCore/QTextStream>
      #include <QtGui/QGuiApplication>
      #include <QtQml/QQmlApplicationEngine>
      #include <QtQuick/QQuickItem>

      static bool parseArgs(QStringList& args, QVariantMap& parameters)
      {

          while (!args.isEmpty()) {

              QString param = args.takeFirst();

              if (param.startsWith("--help")) {
                  QTextStream out(stdout);
                  out << "Usage: " << endl;
                  out << "--plugin.<parameter_name> <parameter_value>    -  Sets parameter = value for plugin" << endl;
                  out.flush();
                  return true;
              }

              if (param.startsWith("--plugin.")) {

                  param.remove(0, 9);

                  if (args.isEmpty() || args.first().startsWith("--")) {
                      parameters[param] = true;
                  } else {

                      QString value = args.takeFirst();

                      if (value == "true" || value == "on" || value == "enabled") {
                          parameters[param] = true;
                      } else if (value == "false" || value == "off"
                                 || value == "disable") {
                          parameters[param] = false;
                      } else {
                          parameters[param] = value;
                      }
                  }
              }
          }
          return false;
      }

      int main(int argc, char *argv[])
      {
          QGuiApplication application(argc, argv);

          QVariantMap parameters;
          QStringList args(QCoreApplication::arguments());

          if (parseArgs(args, parameters))
              return 0;
          if (!args.contains(QStringLiteral("osm.useragent")))
              parameters[QStringLiteral("osm.useragent")] = QStringLiteral("QtLocation Mapviewer example");

          QQmlApplicationEngine engine;
          engine.addImportPath(QStringLiteral(":/imports"));
          engine.load(QUrl(QStringLiteral("qrc:///mapviewer.qml")));
          QObject::connect(&engine, SIGNAL(quit()), qApp, SLOT(quit()));

          QObject *item = engine.rootObjects().first();
          Q_ASSERT(item);

          QMetaObject::invokeMethod(item, "initializeProviders",
                                    Q_ARG(QVariant, QVariant::fromValue(parameters)));

          return application.exec();
      }