Waterpump Example

 // Copyright (C) 2018 basysKom GmbH, opensource@basyskom.com
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #include "opcuamachinebackend.h"

 #include <QFile>
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
 #include <QQmlContext>
 #include <QProcess>
 #include <QtOpcUa>

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

     QString serverExePath;
 #ifdef Q_OS_WIN
     #ifdef EXAMPLES_CMAKE_SPECIFIC_PATH
         serverExePath = app.applicationDirPath().append("/../simulationserver/simulationserver.exe");
     #elif QT_DEBUG
         serverExePath = app.applicationDirPath().append("/../../simulationserver/debug/simulationserver.exe");
     #else
         serverExePath = app.applicationDirPath().append("/../../simulationserver/release/simulationserver.exe");
     #endif
 #elif defined(Q_OS_MACOS)
     serverExePath = app.applicationDirPath().append("/../../../../simulationserver/simulationserver.app/Contents/MacOS/simulationserver");
 #else
     serverExePath = app.applicationDirPath().append("/../simulationserver/simulationserver");
 #endif

     if (!QFile::exists(serverExePath)) {
         qWarning() << "Could not find server executable:" << serverExePath;
         return EXIT_FAILURE;
     }

     QProcess serverProcess;

     serverProcess.start(serverExePath);
     if (!serverProcess.waitForStarted()) {
         qWarning() << "Could not start server:" << serverProcess.errorString();
         return EXIT_FAILURE;
     }

     OpcUaMachineBackend backend;

     QQmlApplicationEngine engine;
     engine.rootContext()->setContextProperty("uaBackend", &backend);
     engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
     if (engine.rootObjects().isEmpty())
         return EXIT_FAILURE;

     const int exitCode = QCoreApplication::exec();
     if (serverProcess.state() == QProcess::Running) {
 #ifndef Q_OS_WIN
         serverProcess.terminate();
 #else
         serverProcess.kill();
 #endif
         serverProcess.waitForFinished();
     }
     return exitCode;
 }