QDBusServiceWatcher Class

Member Function Documentation

QDBusServiceWatcher::QDBusServiceWatcher(const QString &service, const QDBusConnection &connection, WatchMode watchMode = WatchForOwnerChange, QObject *parent = nullptr)

Creates a QDBusServiceWatcher object and attaches it to the connection connection. Also, this function immediately starts watching for watchMode changes to service service.

The parent parameter is passed to QObject to set the parent of this object.

QDBusServiceWatcher::QDBusServiceWatcher(QObject *parent = nullptr)

Creates a QDBusServiceWatcher object. Note that until you set a connection with setConnection(), this object will not emit any signals.

The parent parameter is passed to QObject to set the parent of this object.

[signal] void QDBusServiceWatcher::serviceOwnerChanged(const QString &serviceName, const QString &oldOwner, const QString &newOwner)

This signal is emitted whenever this object detects that there was a service ownership change relating to the serviceName service. The oldOwner parameter contains the old owner name and newOwner is the new owner. Both oldOwner and newOwner are unique connection names.

Note that this signal is also emitted whenever the serviceName service was registered or unregistered. If it was registered, oldOwner will contain an empty string, whereas if it was unregistered, newOwner will contain an empty string.

If you need only to find out if the service is registered or unregistered only, without being notified that the ownership changed, consider using the specific modes for those operations. This class is more efficient if you use the more specific modes.

See also serviceRegistered() and serviceUnregistered().

[signal] void QDBusServiceWatcher::serviceRegistered(const QString &serviceName)

This signal is emitted whenever this object detects that the service serviceName became available on the bus.

See also serviceUnregistered() and serviceOwnerChanged().

[signal] void QDBusServiceWatcher::serviceUnregistered(const QString &serviceName)

This signal is emitted whenever this object detects that the service serviceName was unregistered from the bus and is no longer available.

See also serviceRegistered() and serviceOwnerChanged().

[virtual] QDBusServiceWatcher::~QDBusServiceWatcher()

Destroys the QDBusServiceWatcher object and releases any resources associated with it.

void QDBusServiceWatcher::addWatchedService(const QString &newService)

Adds newService to the list of services to be watched by this object. This function is more efficient than setWatchedServices() and should be used whenever possible to add services.

QDBusConnection QDBusServiceWatcher::connection() const

Returns the QDBusConnection that this object is attached to.

See also setConnection().

bool QDBusServiceWatcher::removeWatchedService(const QString &service)

Removes the service from the list of services being watched by this object. Note that D-Bus notifications are asynchronous, so there may still be signals pending delivery about service. Those signals will still be emitted whenever the D-Bus messages are processed.

This function returns true if any services were removed.

void QDBusServiceWatcher::setConnection(const QDBusConnection &connection)

Sets the D-Bus connection that this object is attached to be connection. All services watched will be transferred to this connection.

Note that QDBusConnection objects are reference counted: QDBusServiceWatcher will keep a reference for this connection while it exists. The connection is not closed until the reference count drops to zero, so this will ensure that any notifications are received while this QDBusServiceWatcher object exists.

See also connection().

void QDBusServiceWatcher::setWatchedServices(const QStringList &services)

Sets the list of D-Bus services being watched to be services.

Note that setting the entire list means removing all previous rules for watching services and adding new ones. This is an expensive operation and should be avoided, if possible. Instead, use addWatchedService() and removeWatchedService() if you can to manipulate entries in the list.

Note: Setter function for property watchedServices.

See also watchedServices().

QStringList QDBusServiceWatcher::watchedServices() const

Returns the list of D-Bus services that are being watched.

Note: Getter function for property watchedServices.

See also setWatchedServices().