Time Server Application | Qt Remote Objects | Qt 6.10.3
Description: A server which shares a time object with connected clients.

- Qt 6.10
- Qt Remote Objects
- Qt Remote Objects Examples
- Time Server Application
- Qt 6.10.3 Reference Documentation

# Time Server Application

A server which shares a time object with connected clients.

The Time Server Application instantiates a `MinuteTimer` object and shares it with all connected Time Client Applications.

#### Defining Remote Objects using a REP-file

The REP-file "timemodel.rep" in the parent directory of the example is used to generate the header-files used by both applications. For this application, the generated "rep_timemodel_source.h" file defines `MinuteTimerSource`, the the class to subclass for the implementation of `MinuteTimer`, and other related classes.

#### The TimeModel Class

The `TimeModel` class in timemodel.h and timemodel.cpp implements the time object to share. It uses a `QBasicTimer` to ensure that the time is updated by calling the `timerEvent` member function.

     void MinuteTimer::timerEvent(QTimerEvent *)
     {
         QTime now = QTime::currentTime();
         if (now.second() == 59 && now.minute() == time.minute() && now.hour() == time.hour()) {
             // just missed time tick over, force it, wait extra 0.5 seconds
             time = time.addSecs(60);
             timer.start(60500, this);
         } else {
             time = now;
             timer.start(60000-time.second()*1000, this);
         }
         qDebug()<<"Time"<<time;
         setHour(time.hour());
         setMinute(time.minute());
         emit timeChanged();
     }

#### Sharing an Instance of TimeModel

Instances of `QRemoteObjectHost` and a `QRemoteObjectRegistryHost` are created to host an object and having a registry to find it. A `MinuteTimer` object is then created and it is shared using the `enableRemoting` member function of the `QRemoteObjectRegistryHost` object.

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

         #if defined(Q_OS_UNIX) || defined(Q_OS_LINUX) || defined(Q_OS_QNX)
             signal(SIGINT, &unix_handler);
         #elif defined(Q_OS_WIN32)
             SetConsoleCtrlHandler((PHANDLER_ROUTINE)WinHandler, TRUE);
         #endif
         QRemoteObjectHost node(QUrl(QStringLiteral("local:replica")),QUrl(QStringLiteral("local:registry")));
         QRemoteObjectRegistryHost node2(QUrl(QStringLiteral("local:registry")));
         MinuteTimer timer;
         node2.enableRemoting(&timer);

         Q_UNUSED(timer)
         return app.exec();
     }

Example project @ code.qt.io

See also Time Client Application.