The QDBusConnectionInterface class provides access to the D-Bus bus daemon service. 更多...
| 头： | #include <QDBusConnectionInterface> |
| qmake: | QT += dbus |
| Since: | Qt 4.2 |
| 继承： | QDBusAbstractInterface |
| enum | RegisterServiceReply { ServiceNotRegistered, ServiceRegistered, ServiceQueued } |
| enum | ServiceQueueOptions { DontQueueService, QueueService, ReplaceExistingService } |
| enum | ServiceReplacementOptions { DontAllowReplacement, AllowReplacement } |
| QDBusReply<bool> | isServiceRegistered (const QString & serviceName ) const |
| QDBusReply<QDBusConnectionInterface::RegisterServiceReply> | registerService (const QString & serviceName , ServiceQueueOptions qoption = DontQueueService, ServiceReplacementOptions roption = DontAllowReplacement) |
| QDBusReply<QStringList> | registeredServiceNames () const |
| QDBusReply<QString> | serviceOwner (const QString & name ) const |
| QDBusReply<uint> | servicePid (const QString & serviceName ) const |
| QDBusReply<uint> | serviceUid (const QString & serviceName ) const |
| QDBusReply<void> | startService (const QString & name ) |
| QDBusReply<bool> | unregisterService (const QString & serviceName ) |
| void | callWithCallbackFailed (const QDBusError & error , const QDBusMessage & call ) |
| void | serviceRegistered (const QString & serviceName ) |
| void | serviceUnregistered (const QString & serviceName ) |
The QDBusConnectionInterface class provides access to the D-Bus bus daemon service.
D-Bus 总线服务器守护程序提供特殊接口
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 () 和 unregisterService () functions, query about existing names using the isServiceRegistered (), registeredServiceNames () 和 serviceOwner () functions, and to receive notification that a client has registered or de-registered through the serviceRegistered (), serviceUnregistered () and serviceOwnerChanged() signals.
可能的返回值来自 registerService ():
| 常量 | 值 | 描述 |
|---|---|---|
QDBusConnectionInterface::ServiceNotRegistered
|
0
|
The call failed and the service name was not registered. |
QDBusConnectionInterface::ServiceRegistered
|
1
|
The caller is now the owner of the service name. |
QDBusConnectionInterface::ServiceQueued
|
2
|
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.
Flags for determining how a service registration should behave, in case the service name is already registered.
| 常量 | 值 | 描述 |
|---|---|---|
QDBusConnectionInterface::DontQueueService
|
0
|
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. |
QDBusConnectionInterface::QueueService
|
1
|
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. |
QDBusConnectionInterface::ReplaceExistingService
|
2
|
If another application already has the service name registered, attempt to replace it. |
另请参阅 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 选项。
可能的值包括：
| 常量 | 值 | 描述 |
|---|---|---|
QDBusConnectionInterface::DontAllowReplacement
|
0
|
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. |
QDBusConnectionInterface::AllowReplacement
|
1
|
Allow other applications to replace us with the ReplaceExistingService 选项到 registerService () without intervention. If that happens, the serviceUnregistered () 信号会被发射。 |
另请参阅 ServiceQueueOptions .
holds the registered service names
Lists all names currently registered on the bus.
访问函数：
| QDBusReply<QStringList> | registeredServiceNames () const |
[signal]
void
QDBusConnectionInterface::
callWithCallbackFailed
(const
QDBusError
&
error
, const
QDBusMessage
&
call
)
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.
另请参阅 QDBusConnection::callWithCallback ().
[slot]
QDBusReply
<
bool
> QDBusConnectionInterface::
isServiceRegistered
(const
QString
&
serviceName
) const
返回
true
if the service name
serviceName
has is currently registered.
[slot]
QDBusReply
<
QDBusConnectionInterface::RegisterServiceReply
> QDBusConnectionInterface::
registerService
(const
QString
&
serviceName
,
ServiceQueueOptions
qoption
= DontQueueService,
ServiceReplacementOptions
roption
= DontAllowReplacement)
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 ， serviceUnregistered () signal will be emitted if another application replaces this one.
另请参阅 unregisterService ().
[slot]
QDBusReply
<
QString
> QDBusConnectionInterface::
serviceOwner
(const
QString
&
name
) const
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
错误。
[slot]
QDBusReply
<
uint
> QDBusConnectionInterface::
servicePid
(const
QString
&
serviceName
) const
Returns the Unix Process ID (PID) for the process currently holding the bus service serviceName .
[signal]
void
QDBusConnectionInterface::
serviceRegistered
(const
QString
&
serviceName
)
This signal is emitted by the D-Bus server when the bus service name (unique connection name or well-known service name) given by serviceName is acquired by this application.
Acquisition happens after this application has requested a name using registerService ().
[slot]
QDBusReply
<
uint
> QDBusConnectionInterface::
serviceUid
(const
QString
&
serviceName
) const
Returns the Unix User ID (UID) for the process currently holding the bus service serviceName .
[signal]
void
QDBusConnectionInterface::
serviceUnregistered
(const
QString
&
serviceName
)
This signal is emitted by the D-Bus server when this application loses ownership of the bus service name given by serviceName .
[slot]
QDBusReply
<
void
> QDBusConnectionInterface::
startService
(const
QString
&
name
)
Requests that the bus start the service given by the name name .
[slot]
QDBusReply
<
bool
> QDBusConnectionInterface::
unregisterService
(const
QString
&
serviceName
)
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.