Qt Reference Documentation

complexping.cpp Example File

dbus/complexpingpong/complexping.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** 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 Nokia Corporation and its Subsidiary(-ies) 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."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <stdio.h>

 #include <QtCore/QCoreApplication>
 #include <QtCore/QFile>
 #include <QtCore/QDebug>
 #include <QtCore/QProcess>
 #include <QtDBus/QtDBus>

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

 void Ping::start(const QString &name, const QString &oldValue, const QString &newValue)
 {
     Q_UNUSED(oldValue);

     if (name != SERVICE_NAME || newValue.isEmpty())
         return;

     // open stdin for reading
     qstdin.open(stdin, QIODevice::ReadOnly);

     // find our remote
     iface = new QDBusInterface(SERVICE_NAME, "/", "com.trolltech.QtDBus.ComplexPong.Pong",
                                QDBusConnection::sessionBus(), this);
     if (!iface->isValid()) {
         fprintf(stderr, "%s\n",
                 qPrintable(QDBusConnection::sessionBus().lastError().message()));
         QCoreApplication::instance()->quit();
     }

     connect(iface, SIGNAL(aboutToQuit()), QCoreApplication::instance(), SLOT(quit()));

     while (true) {
         printf("Ask your question: ");

         QString line = QString::fromLocal8Bit(qstdin.readLine()).trimmed();
         if (line.isEmpty()) {
             iface->call("quit");
             return;
         } else if (line == "value") {
             QVariant reply = iface->property("value");
             if (!reply.isNull())
                 printf("value = %s\n", qPrintable(reply.toString()));
         } else if (line.startsWith("value=")) {
             iface->setProperty("value", line.mid(6));
         } else {
             QDBusReply<QDBusVariant> reply = iface->call("query", line);
             if (reply.isValid())
                 printf("Reply was: %s\n", qPrintable(reply.value().variant().toString()));
         }

         if (iface->lastError().isValid())
             fprintf(stderr, "Call failed: %s\n", qPrintable(iface->lastError().message()));
     }
 }

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

     if (!QDBusConnection::sessionBus().isConnected()) {
         fprintf(stderr, "Cannot connect to the D-Bus session bus.\n"
                 "To start it, run:\n"
                 "\teval `dbus-launch --auto-syntax`\n");
         return 1;
     }

     Ping ping;
     ping.connect(QDBusConnection::sessionBus().interface(),
                  SIGNAL(serviceOwnerChanged(QString,QString,QString)),
                  SLOT(start(QString,QString,QString)));

     QProcess pong;
     pong.start("./complexpong");

     app.exec();
 }
X

Thank you for giving your feedback.

Make sure it is related to this specific page. For more general bugs and requests, please use the Qt Bug Tracker.

[0]; s.parentNode.insertBefore(ga, s); })();