# QDBusServiceWatcher Class Reference
## [[QtDBus](index.htm) module]
該QDBusServiceWatcher類允許用戶觀看的巴士服務的變化。[More...](#details)
繼承[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
該QDBusServiceWatcher類允許用戶觀看的巴士服務的變化。
一個QDBusServiceWatcher對象可以用來通知用戶有關服務名的總線上的所有權變更申請。它有三個手表模式:
* Watching for service registration only.
* Watching for service unregistration only.
* Watching for any kind of service ownership change (the default mode).
除了被創建或刪除,服務可能會改變所有人沒有注銷/寄存器操作發生的事情。所以,[serviceRegistered](qdbusservicewatcher.html#serviceRegistered)()和[serviceUnregistered](qdbusservicewatcher.html#serviceUnregistered)如果發生這種情況()信號可能不被發射。
這個類是比使用更高效的[QDBusConnectionInterface.serviceOwnerChanged](qdbusconnectioninterface.html#serviceOwnerChanged)( )信號,因為它允許一個只接收為其類是感興趣的信號
* * *
## Type Documentation
```
QDBusServiceWatcher.WatchModeFlag
```
[QDBusServiceWatcher](qdbusservicewatcher.html)支持三種不同的觀看模式,這是由該標志配置:
| Constant | Value | Description |
| --- | --- | --- |
| `QDBusServiceWatcher.WatchForRegistration` | `0x01` | 手表僅售服務注冊,而忽略與其他服務的所有權變更的任何信號。 |
| `QDBusServiceWatcher.WatchForUnregistration` | `0x02` | 手表僅售服務注銷,而忽略相關的其他服務所有權變更的任何信號。 |
| `QDBusServiceWatcher.WatchForOwnerChange` | `0x03` | 觀看任何類型的服務所有權的變化。 |
該WatchMode類型是一個typedef為[QFlags](index.htm)\u003cWatchModeFlag\u003e 。它存儲WatchModeFlag值的或組合。
* * *
## Method Documentation
```
QDBusServiceWatcher.__init__ (self, QObject?parent?=?None)
```
該_parent_的說法,如果不是沒有,原因_self_通過Qt的,而不是PyQt的擁有。
創建[QDBusServiceWatcher](qdbusservicewatcher.html)對象。需要注意的是,直到你設置一個連接[setConnection](qdbusservicewatcher.html#setConnection)( ) ,這個對象將不會發出任何信號。
該_parent_參數被傳遞到[QObject](qobject.html)設置該對象的父。
```
QDBusServiceWatcher.__init__ (self, QString?service, QDBusConnection?connection, WatchMode?watchMode?=?QDBusServiceWatcher.WatchForOwnerChange, QObject?parent?=?None)
```
該_parent_的說法,如果不是沒有,原因_self_通過Qt的,而不是PyQt的擁有。
創建[QDBusServiceWatcher](qdbusservicewatcher.html)對象,并將其附加到_connection_連接。另外,此功能將立即啟動窺伺_watchMode_更改服務_service_。
該_parent_參數被傳遞到[QObject](qobject.html)設置該對象的父。
```
QDBusServiceWatcher.addWatchedService (self, QString?newService)
```
添加_newService_到服務,通過該對象被監視的列表。這個函數是比更有效[setWatchedServices](qdbusservicewatcher.html#watchedServices-prop)( ),并應盡可能使用添加服務。
```
QDBusConnection QDBusServiceWatcher.connection (self)
```
[](qdbusconnection.html)
[返回](qdbusconnection.html)[QDBusConnection](qdbusconnection.html)這個對象附加到。
**See also** [setConnection](qdbusservicewatcher.html#setConnection)( ) 。
```
bool QDBusServiceWatcher.removeWatchedService (self, QString?service)
```
移除_service_從正在觀看由該對象的服務的列表。需要注意的是D-Bus的通知是異步的,所以有可能還是待交付有關信號_service_。每當D-Bus的消息處理這些信號仍然會排放。
如果被拆除的任何服務該函數返回True。
```
QDBusServiceWatcher.setConnection (self, QDBusConnection?connection)
```
設置D-Bus的連接,這個對象附加到會_connection_。看著所有服務將被轉移到這方面。
需要注意的是[QDBusConnection](qdbusconnection.html)對象引用計數:[QDBusServiceWatcher](qdbusservicewatcher.html)將保持一個參考此連接,而它的存在。連接不關閉,直到引用計數下降到零,所以這將確保任何通知而收到這[QDBusServiceWatcher](qdbusservicewatcher.html)對象存在。
**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&)
```
這是該信號的默認超載。
每當這個對象檢測到有關于該服務的所有權改變這個信號被發射_serviceName_服務。該_oldOwner_參數包含舊的所有者名稱和_newOwner_是新的主人。兩_oldOwner_和_newOwner_是唯一的連接名。
注意,此信號也被發射時的_serviceName_服務注冊或未注冊。如果它被注冊,_oldOwner_將包含一個空字符串,而如果是未注冊的,_newOwner_將包含一個空字符串。
如果你只需要找出如果該服務被注冊或只登記,不被通知的所有權變更,請考慮使用這些操作的具體模式。如果您使用更具體的模式這個類是更有效的。
](index.htm)
[**See also**](index.htm) [serviceRegistered](qdbusservicewatcher.html#serviceRegistered)()和[serviceUnregistered](qdbusservicewatcher.html#serviceUnregistered)( ) 。
```
void serviceRegistered (const QString&)
```
這是該信號的默認超載。
每當這個對象檢測這個信號被發射,該服務_serviceName_在公共汽車上變得可用。
**See also** [serviceUnregistered](qdbusservicewatcher.html#serviceUnregistered)()和[serviceOwnerChanged](qdbusservicewatcher.html#serviceOwnerChanged)( ) 。
```
void serviceUnregistered (const QString&)
```
這是該信號的默認超載。
每當這個對象檢測這個信號被發射,該服務_serviceName_從總線被取消注冊,并不再可用。
**See also** [serviceRegistered](qdbusservicewatcher.html#serviceRegistered)()和[serviceOwnerChanged](qdbusservicewatcher.html#serviceOwnerChanged)( ) 。
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- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- 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