qt5base-lts/examples/dbus/complexpingpong/complexping.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
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** Alternatively, 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
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#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)
{
if (name != SERVICE_NAME)
return;
// open stdin for reading
qstdin.open(stdin, QIODevice::ReadOnly);
// find our remote
iface = new QDBusInterface(SERVICE_NAME, "/", "org.example.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;
}
QDBusServiceWatcher serviceWatcher(SERVICE_NAME, QDBusConnection::sessionBus(),
QDBusServiceWatcher::WatchForRegistration);
Ping ping;
QObject::connect(&serviceWatcher, &QDBusServiceWatcher::serviceRegistered,
&ping, &Ping::start);
QProcess pong;
pong.start("./complexpong");
app.exec();
}