# QDBusServiceWatcher Class Reference
## [[QtDBus](index.htm) module]
该QDBusServiceWatcher类允许用户观看的巴士服务的变化。[More...](#details)
继承[QObject](qobject.html)。
### Types
* `class **[WatchMode](index.htm)**`
* `enum WatchModeFlag { WatchForRegistration, WatchForUnregistration, WatchForOwnerChange }`
### Methods
* `__init__ (self, QObject parent = None)`
* `__init__ (self, QString service, QDBusConnection connection, WatchMode watchMode = QDBusServiceWatcher.WatchForOwnerChange, QObject parent = None)`
* `addWatchedService (self, QString newService)`
* `QDBusConnection connection (self)`
* `bool removeWatchedService (self, QString service)`
* `setConnection (self, QDBusConnection connection)`
* `setWatchedServices (self, QStringList services)`
* `setWatchMode (self, WatchMode mode)`
* `QStringList watchedServices (self)`
* `WatchMode watchMode (self)`
### Qt Signals
* `void serviceOwnerChanged (const QString&,const QString&,const QString&)`
* `void serviceRegistered (const QString&)`
* `void serviceUnregistered (const QString&)`
* * *
## Detailed Description
该QDBusServiceWatcher类允许用户观看的巴士服务的变化。
一个QDBusServiceWatcher对象可以用来通知用户有关服务名的总线上的所有权变更申请。它有三个手表模式:
* Watching for service registration only.
* Watching for service unregistration only.
* Watching for any kind of service ownership change (the default mode).
除了被创建或删除,服务可能会改变所有人没有注销/寄存器操作发生的事情。所以,[serviceRegistered](qdbusservicewatcher.html#serviceRegistered)()和[serviceUnregistered](qdbusservicewatcher.html#serviceUnregistered)如果发生这种情况()信号可能不被发射。
这个类是比使用更高效的[QDBusConnectionInterface.serviceOwnerChanged](qdbusconnectioninterface.html#serviceOwnerChanged)( )信号,因为它允许一个只接收为其类是感兴趣的信号
* * *
## Type Documentation
```
QDBusServiceWatcher.WatchModeFlag
```
[QDBusServiceWatcher](qdbusservicewatcher.html)支持三种不同的观看模式,这是由该标志配置:
| Constant | Value | Description |
| --- | --- | --- |
| `QDBusServiceWatcher.WatchForRegistration` | `0x01` | 手表仅售服务注册,而忽略与其他服务的所有权变更的任何信号。 |
| `QDBusServiceWatcher.WatchForUnregistration` | `0x02` | 手表仅售服务注销,而忽略相关的其他服务所有权变更的任何信号。 |
| `QDBusServiceWatcher.WatchForOwnerChange` | `0x03` | 观看任何类型的服务所有权的变化。 |
该WatchMode类型是一个typedef为[QFlags](index.htm)\u003cWatchModeFlag\u003e 。它存储WatchModeFlag值的或组合。
* * *
## Method Documentation
```
QDBusServiceWatcher.__init__ (self, QObject parent = None)
```
该_parent_的说法,如果不是没有,原因_self_通过Qt的,而不是PyQt的拥有。
创建[QDBusServiceWatcher](qdbusservicewatcher.html)对象。需要注意的是,直到你设置一个连接[setConnection](qdbusservicewatcher.html#setConnection)( ) ,这个对象将不会发出任何信号。
该_parent_参数被传递到[QObject](qobject.html)设置该对象的父。
```
QDBusServiceWatcher.__init__ (self, QString service, QDBusConnection connection, WatchMode watchMode = QDBusServiceWatcher.WatchForOwnerChange, QObject parent = None)
```
该_parent_的说法,如果不是没有,原因_self_通过Qt的,而不是PyQt的拥有。
创建[QDBusServiceWatcher](qdbusservicewatcher.html)对象,并将其附加到_connection_连接。另外,此功能将立即启动窥伺_watchMode_更改服务_service_。
该_parent_参数被传递到[QObject](qobject.html)设置该对象的父。
```
QDBusServiceWatcher.addWatchedService (self, QString newService)
```
添加_newService_到服务,通过该对象被监视的列表。这个函数是比更有效[setWatchedServices](qdbusservicewatcher.html#watchedServices-prop)( ),并应尽可能使用添加服务。
```
QDBusConnection QDBusServiceWatcher.connection (self)
```
[](qdbusconnection.html)
[返回](qdbusconnection.html)[QDBusConnection](qdbusconnection.html)这个对象附加到。
**See also** [setConnection](qdbusservicewatcher.html#setConnection)( ) 。
```
bool QDBusServiceWatcher.removeWatchedService (self, QString service)
```
移除_service_从正在观看由该对象的服务的列表。需要注意的是D-Bus的通知是异步的,所以有可能还是待交付有关信号_service_。每当D-Bus的消息处理这些信号仍然会排放。
如果被拆除的任何服务该函数返回True。
```
QDBusServiceWatcher.setConnection (self, QDBusConnection connection)
```
设置D-Bus的连接,这个对象附加到会_connection_。看着所有服务将被转移到这方面。
需要注意的是[QDBusConnection](qdbusconnection.html)对象引用计数:[QDBusServiceWatcher](qdbusservicewatcher.html)将保持一个参考此连接,而它的存在。连接不关闭,直到引用计数下降到零,所以这将确保任何通知而收到这[QDBusServiceWatcher](qdbusservicewatcher.html)对象存在。
**See also** [connection](qdbusservicewatcher.html#connection)( ) 。
```
QDBusServiceWatcher.setWatchedServices (self, QStringList services)
```
```
QDBusServiceWatcher.setWatchMode (self, WatchMode mode)
```
```
QStringList QDBusServiceWatcher.watchedServices (self)
```
```
WatchMode QDBusServiceWatcher.watchMode (self)
```
[
* * *
## Qt Signal Documentation
```
void serviceOwnerChanged (const QString&,const QString&,const QString&)
```
这是该信号的默认超载。
每当这个对象检测到有关于该服务的所有权改变这个信号被发射_serviceName_服务。该_oldOwner_参数包含旧的所有者名称和_newOwner_是新的主人。两_oldOwner_和_newOwner_是唯一的连接名。
注意,此信号也被发射时的_serviceName_服务注册或未注册。如果它被注册,_oldOwner_将包含一个空字符串,而如果是未注册的,_newOwner_将包含一个空字符串。
如果你只需要找出如果该服务被注册或只登记,不被通知的所有权变更,请考虑使用这些操作的具体模式。如果您使用更具体的模式这个类是更有效的。
](index.htm)
[**See also**](index.htm) [serviceRegistered](qdbusservicewatcher.html#serviceRegistered)()和[serviceUnregistered](qdbusservicewatcher.html#serviceUnregistered)( ) 。
```
void serviceRegistered (const QString&)
```
这是该信号的默认超载。
每当这个对象检测这个信号被发射,该服务_serviceName_在公共汽车上变得可用。
**See also** [serviceUnregistered](qdbusservicewatcher.html#serviceUnregistered)()和[serviceOwnerChanged](qdbusservicewatcher.html#serviceOwnerChanged)( ) 。
```
void serviceUnregistered (const QString&)
```
这是该信号的默认超载。
每当这个对象检测这个信号被发射,该服务_serviceName_从总线被取消注册,并不再可用。
**See also** [serviceRegistered](qdbusservicewatcher.html#serviceRegistered)()和[serviceOwnerChanged](qdbusservicewatcher.html#serviceOwnerChanged)( ) 。
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- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference