complexping.cpp 范例文件

complexpingpong/complexping.cpp
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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(); }