Qt 5.11 | Qt D-Bus | D-Bus Complex Ping Pong Example | complexpong.cpp Example File

Qt 5.11.3 Reference Documentation

# complexpong.cpp Example File

complexpingpong/complexpong.cpp

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      #include <stdio.h>
      #include <stdlib.h>

      #include <QtCore/QCoreApplication>
      #include <QtCore/QTimer>
      #include <QtDBus/QtDBus>

      #include "ping-common.h"
      #include "complexpong.h"

      // the property
      QString Pong::value() const
      {
          return m_value;
      }

      void Pong::setValue(const QString &newValue)
      {
          m_value = newValue;
      }

      void Pong::quit()
      {
          QTimer::singleShot(0, QCoreApplication::instance(), &QCoreApplication::quit);
      }

      QDBusVariant Pong::query(const QString &query)
      {
          QString q = query.toLower();
          if (q == "hello")
              return QDBusVariant("World");
          if (q == "ping")
              return QDBusVariant("Pong");
          if (q.indexOf("the answer to life, the universe and everything") != -1)
              return QDBusVariant(42);
          if (q.indexOf("unladen swallow") != -1) {
              if (q.indexOf("european") != -1)
                  return QDBusVariant(11.0);
              return QDBusVariant(QByteArray("african or european?"));
          }

          return QDBusVariant("Sorry, I don't know the answer");
      }

      int main(int argc, char **argv)
      {
          QCoreApplication app(argc, argv);

          QObject obj;
          Pong *pong = new Pong(&obj);
          QObject::connect(&app, &QCoreApplication::aboutToQuit, pong, &Pong::aboutToQuit);
          pong->setProperty("value", "initial value");
          QDBusConnection::sessionBus().registerObject("/", &obj);

          if (!QDBusConnection::sessionBus().registerService(SERVICE_NAME)) {
              fprintf(stderr, "%s\n",
                      qPrintable(QDBusConnection::sessionBus().lastError().message()));
              exit(1);
          }

          app.exec();
          return 0;
      }