Qt
Internal/Contributor docs for the Qt SDK. <b>Note:</b> These are NOT official API docs; those are found <a href='https://doc.qt.io/'>here</a>.
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QDBusConnectionInterface Class Reference

\inmodule QtDBus More...

#include <qdbusconnectioninterface.h>

+ Inheritance diagram for QDBusConnectionInterface:
+ Collaboration diagram for QDBusConnectionInterface:

Public Types

enum  ServiceQueueOptions { DontQueueService , QueueService , ReplaceExistingService }
 Flags for determining how a service registration should behave, in case the service name is already registered. More...
 
enum  ServiceReplacementOptions { DontAllowReplacement , AllowReplacement }
 Flags for determining if the D-Bus server should allow another application to replace a name that this application has registered with the ReplaceExistingService option. More...
 
enum  RegisterServiceReply { ServiceNotRegistered = 0 , ServiceRegistered , ServiceQueued }
 The possible return values from registerService(): More...
 

Public Slots

QDBusReply< QStringListregisteredServiceNames () const
 
QDBusReply< QStringListactivatableServiceNames () const
 
QDBusReply< bool > isServiceRegistered (const QString &serviceName) const
 Returns true if the service name serviceName has is currently registered.
 
QDBusReply< QStringserviceOwner (const QString &name) const
 Returns the unique connection name of the primary owner of the name name.
 
QDBusReply< bool > unregisterService (const QString &serviceName)
 Releases the claim on the bus service name serviceName, that had been previously registered with registerService().
 
QDBusReply< QDBusConnectionInterface::RegisterServiceReplyregisterService (const QString &serviceName, ServiceQueueOptions qoption=DontQueueService, ServiceReplacementOptions roption=DontAllowReplacement)
 Requests to register the service name serviceName on the bus.
 
QDBusReply< uintservicePid (const QString &serviceName) const
 Returns the Unix Process ID (PID) for the process currently holding the bus service serviceName.
 
QDBusReply< uintserviceUid (const QString &serviceName) const
 Returns the Unix User ID (UID) for the process currently holding the bus service serviceName.
 
QDBusReply< voidstartService (const QString &name)
 Requests that the bus start the service given by the name name.
 
- Public Slots inherited from QObject
void deleteLater ()
 \threadsafe
 

Signals

void serviceRegistered (const QString &service)
 This signal is emitted by the D-Bus server when the bus service name (unique connection name or well-known service name) given by service is acquired by this application.
 
void serviceUnregistered (const QString &service)
 This signal is emitted by the D-Bus server when this application loses ownership of the bus service name given by service.
 
void serviceOwnerChanged (const QString &name, const QString &oldOwner, const QString &newOwner)
 
void callWithCallbackFailed (const QDBusError &error, const QDBusMessage &call)
 This signal is emitted when there is an error during a QDBusConnection::callWithCallback().
 
void NameAcquired (const QString &)
 
void NameLost (const QString &)
 
void NameOwnerChanged (const QString &, const QString &, const QString &)
 
- Signals inherited from QObject
void destroyed (QObject *=nullptr)
 This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
 
void objectNameChanged (const QString &objectName, QPrivateSignal)
 This signal is emitted after the object's name has been changed.
 

Protected Member Functions

void connectNotify (const QMetaMethod &) override
 
void disconnectNotify (const QMetaMethod &) override
 
- Protected Member Functions inherited from QDBusAbstractInterface
 QDBusAbstractInterface (const QString &service, const QString &path, const char *interface, const QDBusConnection &connection, QObject *parent)
 
 QDBusAbstractInterface (QDBusAbstractInterfacePrivate &, QObject *parent)
 
QVariant internalPropGet (const char *propname) const
 
void internalPropSet (const char *propname, const QVariant &value)
 
QDBusMessage internalConstCall (QDBus::CallMode mode, const QString &method, const QList< QVariant > &args=QList< QVariant >()) const
 
- Protected Member Functions inherited from QDBusAbstractInterfaceBase
 QDBusAbstractInterfaceBase (QDBusAbstractInterfacePrivate &dd, QObject *parent)
 
- Protected Member Functions inherited from QObject
QObjectsender () const
 Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
 
int senderSignalIndex () const
 
int receivers (const char *signal) const
 Returns the number of receivers connected to the signal.
 
bool isSignalConnected (const QMetaMethod &signal) const
 
virtual void timerEvent (QTimerEvent *event)
 This event handler can be reimplemented in a subclass to receive timer events for the object.
 
virtual void childEvent (QChildEvent *event)
 This event handler can be reimplemented in a subclass to receive child events.
 
virtual void customEvent (QEvent *event)
 This event handler can be reimplemented in a subclass to receive custom events.
 
 QObject (QObjectPrivate &dd, QObject *parent=nullptr)
 

Properties

QDBusReply< QStringListregisteredServiceNames
 holds the registered service names
 
QDBusReply< QStringListactivatableServiceNames
 holds the activatable service names
 
- Properties inherited from QObject
QString objectName
 the name of this object
 

Friends

class QDBusConnectionPrivate
 

Additional Inherited Members

- Public Member Functions inherited from QDBusAbstractInterface
virtual ~QDBusAbstractInterface ()
 Releases this object's resources.
 
bool isValid () const
 Returns true if this is a valid reference to a remote object.
 
QDBusConnection connection () const
 Returns the connection this interface is associated with.
 
QString service () const
 Returns the name of the service this interface is associated with.
 
QString path () const
 Returns the object path that this interface is associated with.
 
QString interface () const
 Returns the name of this interface.
 
QDBusError lastError () const
 Returns the error the last operation produced, or an invalid error if the last operation did not produce an error.
 
void setTimeout (int timeout)
 Sets the timeout in milliseconds for all future DBus calls to timeout.
 
int timeout () const
 Returns the current value of the timeout in milliseconds.
 
void setInteractiveAuthorizationAllowed (bool enable)
 Configures whether, for asynchronous calls, the caller is prepared to wait for interactive authorization.
 
bool isInteractiveAuthorizationAllowed () const
 Returns whether, for asynchronous calls, the caller is prepared to wait for interactive authorization.
 
QDBusMessage call (const QString &method)
 
template<typename... Args>
QDBusMessage call (const QString &method, Args &&...args)
 Calls the method method on this interface and passes args to the method.
 
QDBusMessage call (QDBus::CallMode mode, const QString &method)
 
template<typename... Args>
QDBusMessage call (QDBus::CallMode mode, const QString &method, Args &&...args)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Calls the method method on this interface and passes args to the method.
 
QDBusMessage callWithArgumentList (QDBus::CallMode mode, const QString &method, const QList< QVariant > &args)
 Places a call to the remote method specified by method on this interface, using args as arguments.
 
bool callWithCallback (const QString &method, const QList< QVariant > &args, QObject *receiver, const char *member, const char *errorSlot)
 Places a call to the remote method specified by method on this interface, using args as arguments.
 
bool callWithCallback (const QString &method, const QList< QVariant > &args, QObject *receiver, const char *member)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function is deprecated.
 
QDBusPendingCall asyncCall (const QString &method)
 
template<typename... Args>
QDBusPendingCall asyncCall (const QString &method, Args &&...args)
 Calls the method method on this interface and passes args to the method.
 
QDBusPendingCall asyncCallWithArgumentList (const QString &method, const QList< QVariant > &args)
 
- Public Member Functions inherited from QDBusAbstractInterfaceBase
int qt_metacall (QMetaObject::Call, int, void **) override
 
- Public Member Functions inherited from QObject
Q_INVOKABLE QObject (QObject *parent=nullptr)
 Constructs an object with parent object parent.
 
virtual ~QObject ()
 Destroys the object, deleting all its child objects.
 
virtual bool event (QEvent *event)
 This virtual function receives events to an object and should return true if the event e was recognized and processed.
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 Filters events if this object has been installed as an event filter for the watched object.
 
QString objectName () const
 
Q_WEAK_OVERLOAD void setObjectName (const QString &name)
 Sets the object's name to name.
 
void setObjectName (QAnyStringView name)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
QBindable< QStringbindableObjectName ()
 
bool isWidgetType () const
 Returns true if the object is a widget; otherwise returns false.
 
bool isWindowType () const
 Returns true if the object is a window; otherwise returns false.
 
bool isQuickItemType () const
 Returns true if the object is a QQuickItem; otherwise returns false.
 
bool signalsBlocked () const noexcept
 Returns true if signals are blocked; otherwise returns false.
 
bool blockSignals (bool b) noexcept
 If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
 
QThreadthread () const
 Returns the thread in which the object lives.
 
bool moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
 Changes the thread affinity for this object and its children and returns true on success.
 
int startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
 This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
 
int startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
 
void killTimer (int id)
 Kills the timer with timer identifier, id.
 
void killTimer (Qt::TimerId id)
 
template<typename T >
findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
 
template<typename T >
QList< T > findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
 
template<typename T >
findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
template<typename T >
QList< T > findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
const QObjectListchildren () const
 Returns a list of child objects.
 
void setParent (QObject *parent)
 Makes the object a child of parent.
 
void installEventFilter (QObject *filterObj)
 Installs an event filter filterObj on this object.
 
void removeEventFilter (QObject *obj)
 Removes an event filter object obj from this object.
 
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
 
bool disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const
 
bool disconnect (const QObject *receiver, const char *member=nullptr) const
 
void dumpObjectTree () const
 Dumps a tree of children to the debug output.
 
void dumpObjectInfo () const
 Dumps information about signal connections, etc.
 
bool setProperty (const char *name, const QVariant &value)
 Sets the value of the object's name property to value.
 
bool setProperty (const char *name, QVariant &&value)
 
QVariant property (const char *name) const
 Returns the value of the object's name property.
 
QList< QByteArraydynamicPropertyNames () const
 
QBindingStoragebindingStorage ()
 
const QBindingStoragebindingStorage () const
 
QObjectparent () const
 Returns a pointer to the parent object.
 
bool inherits (const char *classname) const
 Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.
 
- Static Public Member Functions inherited from QObject
static QMetaObject::Connection connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
 \threadsafe
 
static QMetaObject::Connection connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
 
template<typename Func1 , typename Func2 >
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
 
template<typename Func1 , typename Func2 >
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
 
static bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
 \threadsafe
 
static bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
 
static bool disconnect (const QMetaObject::Connection &)
 Disconnect a connection.
 
template<typename Func1 , typename Func2 >
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot)
 
template<typename Func1 >
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero)
 
- Protected Attributes inherited from QObject
QScopedPointer< QObjectDatad_ptr
 

Detailed Description

\inmodule QtDBus

Since
4.2

The QDBusConnectionInterface class provides access to the D-Bus bus daemon service.

The D-Bus bus server daemon provides one special interface org.freedesktop.DBus that allows clients to access certain properties of the bus, such as the current list of clients connected. The QDBusConnectionInterface class provides access to that interface.

The most common uses of this class are to register and unregister service names on the bus using the registerService() and unregisterService() functions, query about existing names using the isServiceRegistered(), registeredServiceNames() and serviceOwner() functions, and to receive notification that a client has registered or de-registered through the serviceRegistered(), serviceUnregistered() and serviceOwnerChanged() signals.

Definition at line 25 of file qdbusconnectioninterface.h.

Member Enumeration Documentation

◆ RegisterServiceReply

The possible return values from registerService():

\value ServiceNotRegistered The call failed and the service name was not registered. \value ServiceRegistered The caller is now the owner of the service name. \value ServiceQueued The caller specified the QueueService flag and the service was already registered, so we are in queue.

The serviceRegistered() signal will be emitted when the service is acquired by this application.

Enumerator
ServiceNotRegistered 
ServiceRegistered 
ServiceQueued 

Definition at line 49 of file qdbusconnectioninterface.h.

◆ ServiceQueueOptions

Flags for determining how a service registration should behave, in case the service name is already registered.

\value DontQueueService If an application requests a name that is already owned, no queueing will be performed. The registeredService() call will simply fail. This is the default.

\value QueueService Attempts to register the requested service, but do not try to replace it if another application already has it registered. Instead, simply put this application in queue, until it is given up. The serviceRegistered() signal will be emitted when that happens.

\value ReplaceExistingService If another application already has the service name registered, attempt to replace it.

See also
ServiceReplacementOptions
Enumerator
DontQueueService 
QueueService 
ReplaceExistingService 

Definition at line 38 of file qdbusconnectioninterface.h.

◆ ServiceReplacementOptions

Flags for determining if the D-Bus server should allow another application to replace a name that this application has registered with the ReplaceExistingService option.

The possible values are:

\value DontAllowReplacement Do not allow another application to replace us. The service must be explicitly unregistered with unregisterService() for another application to acquire it. This is the default.

\value AllowReplacement Allow other applications to replace us with the ReplaceExistingService option to registerService() without intervention. If that happens, the serviceUnregistered() signal will be emitted.

See also
ServiceQueueOptions
Enumerator
DontAllowReplacement 
AllowReplacement 

Definition at line 44 of file qdbusconnectioninterface.h.

Member Function Documentation

◆ activatableServiceNames

QDBusReply< QStringList > QDBusConnectionInterface::activatableServiceNames ( ) const
slot

Definition at line 174 of file qdbusconnectioninterface.cpp.

References QDBus::AutoDetect, and QDBusAbstractInterface::internalConstCall().

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◆ callWithCallbackFailed

void QDBusConnectionInterface::callWithCallbackFailed ( const QDBusError & error,
const QDBusMessage & call )
signal

This signal is emitted when there is an error during a QDBusConnection::callWithCallback().

error specifies the error. call is the message that couldn't be delivered.

See also
QDBusConnection::callWithCallback()

Referenced by QDBusConnectionPrivate::createBusService().

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◆ connectNotify()

void QDBusConnectionInterface::connectNotify ( const QMetaMethod & signal)
overrideprotectedvirtual

Reimplemented from QDBusAbstractInterface.

Definition at line 308 of file qdbusconnectioninterface.cpp.

References QDBusAbstractInterface::connectNotify(), QMetaMethod::fromSignal(), NameAcquired(), NameLost(), NameOwnerChanged(), qWarning, serviceOwnerChanged(), serviceRegistered(), serviceUnregistered(), and signal.

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◆ disconnectNotify()

void QDBusConnectionInterface::disconnectNotify ( const QMetaMethod & signal)
overrideprotectedvirtual

Reimplemented from QDBusAbstractInterface.

Definition at line 337 of file qdbusconnectioninterface.cpp.

References QDBusAbstractInterface::disconnectNotify(), QMetaMethod::fromSignal(), NameAcquired(), NameLost(), NameOwnerChanged(), serviceOwnerChanged(), serviceRegistered(), serviceUnregistered(), and signal.

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◆ isServiceRegistered

QDBusReply< bool > QDBusConnectionInterface::isServiceRegistered ( const QString & serviceName) const
slot

Returns true if the service name serviceName has is currently registered.

Definition at line 183 of file qdbusconnectioninterface.cpp.

References QDBus::AutoDetect, and QDBusAbstractInterface::internalConstCall().

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◆ NameAcquired

void QDBusConnectionInterface::NameAcquired ( const QString & )
signal

Referenced by connectNotify(), and disconnectNotify().

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◆ NameLost

void QDBusConnectionInterface::NameLost ( const QString & )
signal

Referenced by connectNotify(), and disconnectNotify().

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◆ NameOwnerChanged

void QDBusConnectionInterface::NameOwnerChanged ( const QString & ,
const QString & ,
const QString &  )
signal

Referenced by connectNotify(), and disconnectNotify().

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◆ registeredServiceNames

QDBusReply< QStringList > QDBusConnectionInterface::registeredServiceNames ( ) const
slot

Definition at line 162 of file qdbusconnectioninterface.cpp.

References QDBus::AutoDetect, and QDBusAbstractInterface::internalConstCall().

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◆ registerService

QDBusReply< QDBusConnectionInterface::RegisterServiceReply > QDBusConnectionInterface::registerService ( const QString & serviceName,
ServiceQueueOptions qoption = DontQueueService,
ServiceReplacementOptions roption = DontAllowReplacement )
slot

Requests to register the service name serviceName on the bus.

The qoption flag specifies how the D-Bus server should behave if serviceName is already registered. The roption flag specifies if the server should allow another application to replace our registered name.

If the service registration succeeds, the serviceRegistered() signal will be emitted. If we are placed in queue, the signal will be emitted when we obtain the name. If roption is AllowReplacement, the serviceUnregistered() signal will be emitted if another application replaces this one.

See also
unregisterService()

Definition at line 233 of file qdbusconnectioninterface.cpp.

References AllowReplacement, QDBusAbstractInterface::call(), DBUS_NAME_FLAG_ALLOW_REPLACEMENT, DBUS_NAME_FLAG_DO_NOT_QUEUE, DBUS_NAME_FLAG_REPLACE_EXISTING, DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER, DBUS_REQUEST_NAME_REPLY_EXISTS, DBUS_REQUEST_NAME_REPLY_IN_QUEUE, DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER, DontAllowReplacement, DontQueueService, QueueService, ReplaceExistingService, reply, QDBusMessage::ReplyMessage, ServiceNotRegistered, ServiceQueued, and ServiceRegistered.

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◆ serviceOwner

QDBusReply< QString > QDBusConnectionInterface::serviceOwner ( const QString & name) const
slot

Returns the unique connection name of the primary owner of the name name.

If the requested name doesn't have an owner, returns a org.freedesktop.DBus.Error.NameHasNoOwner error.

Definition at line 151 of file qdbusconnectioninterface.cpp.

References QDBus::AutoDetect, and QDBusAbstractInterface::internalConstCall().

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◆ serviceOwnerChanged

QDBusConnectionInterface::serviceOwnerChanged ( const QString & name,
const QString & oldOwner,
const QString & newOwner )
signal
Deprecated

Use QDBusServiceWatcher instead.

This signal is emitted by the D-Bus server whenever a service ownership change happens in the bus, including apparition and disparition of names.

This signal means the application oldOwner lost ownership of bus name name to application newOwner. If oldOwner is an empty string, it means the name name has just been created; if newOwner is empty, the name name has no current owner and is no longer available.

Note
connecting to this signal will make the application listen for and receive every single service ownership change on the bus. Depending on how many services are running, this make the application be activated to receive more signals than it needs. To avoid this problem, use the QDBusServiceWatcher class, which can listen for specific changes.

Referenced by connectNotify(), and disconnectNotify().

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◆ servicePid

QDBusReply< uint > QDBusConnectionInterface::servicePid ( const QString & serviceName) const
slot

Returns the Unix Process ID (PID) for the process currently holding the bus service serviceName.

Definition at line 193 of file qdbusconnectioninterface.cpp.

References QDBus::AutoDetect, and QDBusAbstractInterface::internalConstCall().

Referenced by bluetoothdVersion().

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◆ serviceRegistered

QDBusConnectionInterface::serviceRegistered ( const QString & service)
signal

This signal is emitted by the D-Bus server when the bus service name (unique connection name or well-known service name) given by service is acquired by this application.

Acquisition happens after this application has requested a name using registerService().

Referenced by connectNotify(), and disconnectNotify().

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◆ serviceUid

QDBusReply< uint > QDBusConnectionInterface::serviceUid ( const QString & serviceName) const
slot

Returns the Unix User ID (UID) for the process currently holding the bus service serviceName.

Definition at line 203 of file qdbusconnectioninterface.cpp.

References QDBus::AutoDetect, and QDBusAbstractInterface::internalConstCall().

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◆ serviceUnregistered

QDBusConnectionInterface::serviceUnregistered ( const QString & service)
signal

This signal is emitted by the D-Bus server when this application loses ownership of the bus service name given by service.

Referenced by connectNotify(), and disconnectNotify().

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◆ startService

QDBusReply< void > QDBusConnectionInterface::startService ( const QString & name)
slot

Requests that the bus start the service given by the name name.

Definition at line 212 of file qdbusconnectioninterface.cpp.

References QDBusAbstractInterface::call().

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◆ unregisterService

QDBusReply< bool > QDBusConnectionInterface::unregisterService ( const QString & serviceName)
slot

Releases the claim on the bus service name serviceName, that had been previously registered with registerService().

If this application had ownership of the name, it will be released for other applications to claim. If it only had the name queued, it gives up its position in the queue.

Definition at line 295 of file qdbusconnectioninterface.cpp.

References QDBusAbstractInterface::call(), DBUS_RELEASE_NAME_REPLY_RELEASED, reply, and QDBusMessage::ReplyMessage.

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Friends And Related Symbol Documentation

◆ QDBusConnectionPrivate

friend class QDBusConnectionPrivate
friend

Definition at line 28 of file qdbusconnectioninterface.h.

Property Documentation

◆ activatableServiceNames

QDBusConnectionInterface::activatableServiceNames
read

holds the activatable service names

Since
5.14

Lists all names that can be activated on the bus.

Definition at line 35 of file qdbusconnectioninterface.h.

◆ registeredServiceNames

QDBusConnectionInterface::registeredServiceNames
read

holds the registered service names

Lists all names currently registered on the bus.

Definition at line 34 of file qdbusconnectioninterface.h.


The documentation for this class was generated from the following files: