C++ QDBusMessage::signature方法代码示例

QDebug operator<<(QDebug dbg, const QDBusMessage &msg)
{
    dbg.nospace() << "QDBusMessage(type=" << msg.type()
                  << ", service=" << msg.service();
    if (msg.type() == QDBusMessage::MethodCallMessage ||
        msg.type() == QDBusMessage::SignalMessage)
        dbg.nospace() << ", path=" << msg.path()
                      << ", interface=" << msg.interface()
                      << ", member=" << msg.member();
    if (msg.type() == QDBusMessage::ErrorMessage)
        dbg.nospace() << ", error name=" << msg.errorName()
                      << ", error message=" << msg.errorMessage();
    dbg.nospace() << ", signature=" << msg.signature()
                  << ", contents=(";
    debugVariantList(dbg, msg.arguments());
    dbg.nospace() << ") )";
    return dbg.space();
}

static QScriptValue messageToScriptValue(QScriptEngine *engine, const QDBusMessage &message)
{
    QScriptValue v = engine->newVariant(QVariant::fromValue(message));
    v.setProperty(QLatin1String("service"), QScriptValue(engine, message.service()), QScriptValue::ReadOnly);
    v.setProperty(QLatin1String("path"), QScriptValue(engine, message.path()), QScriptValue::ReadOnly);
    v.setProperty(QLatin1String("interface"), QScriptValue(engine, message.interface()), QScriptValue::ReadOnly);
    v.setProperty(QLatin1String("member"), QScriptValue(engine, message.member()), QScriptValue::ReadOnly);
    v.setProperty(QLatin1String("type"), QScriptValue(engine, message.type()), QScriptValue::ReadOnly);
    v.setProperty(QLatin1String("signature"), QScriptValue(engine, message.signature()), QScriptValue::ReadOnly);
    v.setProperty(QLatin1String("isReplyRequired"), QScriptValue(engine, message.isReplyRequired()), QScriptValue::ReadOnly);

    v.setProperty(QLatin1String("delayedReply"), QScriptValue(engine, message.isDelayedReply()));
    QScriptValue argValue = engine->newArray();
    const QList<QVariant> args = message.arguments();
    for (int i = 0; i < args.count(); ++i)
        argValue.setProperty(QScriptValue(engine, i).toString(),
                             engine->newVariant(args.at(i)));

    v.setProperty(QLatin1String("arguments"), argValue);

    return v;
}

int ThermaldInterface::getTripInformation(uint zone_index,
                                          uint trip_index, tripInformationType &info)
{
    QDBusMessage result;

    result = iface->call("GetZoneTripAtIndex", zone_index, trip_index);

    if (result.type() == QDBusMessage::ReplyMessage) {
        info.temp = result.arguments().at(0).toInt() / 1000;
        info.trip_type = result.arguments().at(1).toInt();
        info.sensor_id = result.arguments().at(2).toInt();
        info.cdev_size = result.arguments().at(3).toInt();
        //        info.cdev_ids = result.arguments().at(4).toList();
        return 0;
    } else if (result.signature().isEmpty()){
        // If we get and empty response, then ignore it, but return error code
        return -1;
    } else {
        qCritical() << "error from" << iface->interface() <<  result.errorMessage()
                    << zone_index << trip_index;
        return -1;
    }
}

QVariant QDBusAbstractInterfacePrivate::property(const QMetaProperty &mp) const
{
    if (!connection.isConnected())    // not connected
        return QVariant();

    // is this metatype registered?
    int mid;
    const char *expectedSignature;
    if (mp.type() == QVariant::LastType) {
        // We're asking to read a QVariant
        mid = qMetaTypeId<QDBusVariant>();
        expectedSignature = "v";
    } else {
        mid = QMetaType::type(mp.typeName());
        expectedSignature = QDBusMetaType::typeToSignature(mid);
        if (expectedSignature == 0) {
            qWarning("QDBusAbstractInterface: type %s must be registered with QtDBus before it can be "
                     "used to read property %s.%s",
                     mp.typeName(), qPrintable(interface), mp.name());
            return QVariant();
        }
    }

    // try to read this property
    QDBusMessage msg = QDBusMessage::createMethodCall(service, path,
                                                      QLatin1String(DBUS_INTERFACE_PROPERTIES),
                                                      QLatin1String("Get"));
    msg << interface << QString::fromUtf8(mp.name());
    QDBusMessage reply = connection.call(msg, QDBus::Block);

    if (reply.type() != QDBusMessage::ReplyMessage) {
        lastError = reply;
        return QVariant();
    }
    if (reply.signature() != QLatin1String("v")) {
        QString errmsg = QLatin1String("Invalid signature `%1' in return from call to "
                                       DBUS_INTERFACE_PROPERTIES);
        lastError = QDBusError(QDBusError::InvalidSignature, errmsg.arg(reply.signature()));
        return QVariant();
    }

    QByteArray foundSignature;
    const char *foundType = 0;
    QVariant value = qvariant_cast<QDBusVariant>(reply.arguments().at(0)).variant();

    if (value.userType() == mid)
        return value;       // simple match

    if (value.userType() == qMetaTypeId<QDBusArgument>()) {
        QDBusArgument arg = qvariant_cast<QDBusArgument>(value);

        foundType = "user type";
        foundSignature = arg.currentSignature().toLatin1();
        if (foundSignature == expectedSignature) {
            void *null = 0;
            QVariant result(mid, null);
            QDBusMetaType::demarshall(arg, mid, result.data());

            if (mp.type() == QVariant::LastType)
                // special case: QVariant
                return qvariant_cast<QDBusVariant>(result).variant();
            return result;
        }
    } else {
        foundType = value.typeName();
        foundSignature = QDBusMetaType::typeToSignature(value.userType());
    }

    // there was an error...
    QString errmsg = QLatin1String("Unexpected `%1' (%2) when retrieving property `%3.%4' "
                                   "(expected type `%5' (%6))");
    lastError = QDBusError(QDBusError::InvalidSignature,
                           errmsg.arg(QString::fromLatin1(foundType),
                                      QString::fromLatin1(foundSignature),
                                      interface,
                                      QString::fromUtf8(mp.name()),
                                      QString::fromLatin1(mp.typeName()),
                                      QString::fromLatin1(expectedSignature)));
    return QVariant();
}