源代码:
void QRemoteObjectSourceIo::onServerDisconnect(QObject *conn)
{
    IoDeviceBase *connection = qobject_cast<IoDeviceBase*>(conn);
    m_connections.remove(connection);

    qRODebug(this) << "OnServerDisconnect";

    for (QRemoteObjectRootSource *root : qAsConst(m_sourceRoots))
        root->removeListener(connection);

    const QUrl location = m_registryMapping.value(connection);
    emit serverRemoved(location);
    m_registryMapping.remove(connection);
    connection->close();
    connection->deleteLater();
}

bool QRemoteObjectHostBase::setHostUrl(const QUrl &hostAddress)
{
    Q_D(QRemoteObjectHostBase);
    if (d->remoteObjectIo) {
        d->setLastError(ServerAlreadyCreated);
        return false;
    }

    d->remoteObjectIo = new QRemoteObjectSourceIo(hostAddress, this);
    if (d->remoteObjectIo->m_server.isNull()) { //Invalid url/scheme
        d->setLastError(HostUrlInvalid);
        delete d->remoteObjectIo;
        d->remoteObjectIo = 0;
        return false;
    }

    //If we've given a name to the node, set it on the sourceIo as well
    if (!objectName().isEmpty())
        d->remoteObjectIo->setObjectName(objectName());

    //Since we don't know whether setHostUrl or setRegistryUrl/setRegistryHost will be called first,
    //break it into two pieces.  setHostUrl connects the RemoteObjectSourceIo->[add/remove]RemoteObjectSource to QRemoteObjectReplicaNode->[add/remove]RemoteObjectSource
    //setRegistry* calls appropriately connect RemoteObjecSourcetIo->[add/remove]RemoteObjectSource to the registry when it is created
    QObject::connect(d->remoteObjectIo, &QRemoteObjectSourceIo::remoteObjectAdded, this, &QRemoteObjectHostBase::remoteObjectAdded);
    QObject::connect(d->remoteObjectIo, &QRemoteObjectSourceIo::remoteObjectRemoved, this, &QRemoteObjectHostBase::remoteObjectRemoved);

    return true;
}

建议修改代码:
void QRemoteObjectSourceIo::onServerDisconnect(QObject *conn)
{
    ServerIoDevice *connection = qobject_cast<ServerIoDevice*>(conn);
    m_connections.remove(connection);

    qRODebug(this) << "OnServerDisconnect" << connection->objectName();

    Q_FOREACH (QRemoteObjectRootSource *root, m_sourceRoots) {
        root->removeListener(connection);
        if (root->name() == connection->objectName())
            emit remoteObjectDisconnect(root->name(), root->m_api->typeName());
    }

    const QUrl location = m_registryMapping.value(connection);
    emit serverRemoved(location);
    m_registryMapping.remove(connection);
    connection->close();
    connection->deleteLater();
}

bool QRemoteObjectHostBase::setHostUrl(const QUrl &hostAddress)
{
    Q_D(QRemoteObjectHostBase);
    if (d->remoteObjectIo) {
        d->setLastError(ServerAlreadyCreated);
        return false;
    }

    d->remoteObjectIo = new QRemoteObjectSourceIo(hostAddress, this);
    if (d->remoteObjectIo->m_server.isNull()) { //Invalid url/scheme
        d->setLastError(HostUrlInvalid);
        delete d->remoteObjectIo;
        d->remoteObjectIo = 0;
        return false;
    }

    //If we've given a name to the node, set it on the sourceIo as well
    if (!objectName().isEmpty())
        d->remoteObjectIo->setObjectName(objectName());

    QObject::connect(d->remoteObjectIo, &QRemoteObjectSourceIo::remoteObjectDisconnect, this, &QRemoteObjectHostBase::remoteObjectDisconnect);

    //Since we don't know whether setHostUrl or setRegistryUrl/setRegistryHost will be called first,
    //break it into two pieces.  setHostUrl connects the RemoteObjectSourceIo->[add/remove]RemoteObjectSource to QRemoteObjectReplicaNode->[add/remove]RemoteObjectSource
    //setRegistry* calls appropriately connect RemoteObjecSourcetIo->[add/remove]RemoteObjectSource to the registry when it is created
    QObject::connect(d->remoteObjectIo, &QRemoteObjectSourceIo::remoteObjectAdded, this, &QRemoteObjectHostBase::remoteObjectAdded);
    QObject::connect(d->remoteObjectIo, &QRemoteObjectSourceIo::remoteObjectRemoved, this, &QRemoteObjectHostBase::remoteObjectRemoved);

    return true;
}