- Qt 5.5
- Qt Location
- Map Viewer (QML)
- main.cpp Example File
- Qt 5.5.1 Reference Documentation

# main.cpp Example File

mapviewer/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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;

        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();
    }