# QSocketNotifier Class Reference
## [[QtCore](index.htm) module]
該QSocketNotifier類提供了一個文件描述符監測活動的支持。[More...](#details)
繼承[QObject](qobject.html)。
### Types
* `enum Type { Read, Write, Exception }`
### Methods
* `__init__ (self, int?socket, Type?type, QObject?parent?=?None)`
* `bool event (self, QEvent)`
* `bool isEnabled (self)`
* `setEnabled (self, bool)`
* `int socket (self)`
* `Type type (self)`
### Qt Signals
* `void activated (int)`
* * *
## Detailed Description
該QSocketNotifier類提供了一個文件描述符監測活動的支持。
該QSocketNotifier使得能夠整合Qt的事件循環與基于文件描述符其他事件循環。例如，本 [CORBA Framework](http://qt.digia.com/products/add-on-products/catalog/4/Utilities/qtcorba/)使用它來處理CORBA的事件。在Qt的主事件循環（當檢測到文件描述符行動[QCoreApplication.exec](qcoreapplication.html#exec)（））。
一旦你已經使用一個低級別（通常特定于平臺）的API打開一個設備，你可以創建一個socket通知監視的文件描述符。該插座通知是默認啟用的，也就是說，它發出的[activated](qsocketnotifier.html#activated)（ ）信號時對應其類型的套接字事件發生。連接[activated](qsocketnotifier.html#activated)（）信號，要在對應的插槽通知的類型的事件發生時要調用的插槽。
有三種類型的套接字通知者的：讀，寫和異常。類型由所描述的[Type](qsocketnotifier.html#Type-enum)枚舉，而且必須構建插座通知時指定。項目建成后可利用裝置[type](qsocketnotifier.html#type)（）函數。請注意，如果你需要同時監視讀取和相同的文件描述符寫入，您必須創建兩個socket通知者。還請注意，這是不可能安裝相同類型的兩個插座通知器（[Read](qsocketnotifier.html#Type-enum)，[Write](qsocketnotifier.html#Type-enum)，[Exception](qsocketnotifier.html#Type-enum)）在同一個插座上。
該[setEnabled](qsocketnotifier.html#setEnabled)（ ）函數允許你禁用和啟用套接字通知。它一般最好明確地啟用或禁用該插座通知器，特別是用于寫通知器。停用的通知忽略套接字事件（同樣的效果不是創建套接字通知） 。使用[isEnabled](qsocketnotifier.html#isEnabled)（ ）函數來確定通知的當前狀態。
最后，您可以使用[socket](qsocketnotifier.html#socket)（ ）函數來獲取套接字標識符。雖然該類稱為QSocketNotifier ，它通常是用于其它類型的設備比套接字。[QTcpSocket](qtcpsocket.html)和[QUdpSocket](qudpsocket.html)通過信號提供通知，所以通常沒有必要對他們使用QSocketNotifier 。
### Notes for Windows Users
傳遞給QSocketNotifier插座將成為不可阻擋，即使它被創建為一個阻塞套接字。該[activated](qsocketnotifier.html#activated)（）信號是由主機上的高活性一般有時觸發，即使沒有要讀出。然后從插座后續讀取可能會失敗，錯誤表明有可用（例如，沒有數據，`WSAEWOULDBLOCK`） 。這是一個操作系統的限制，而不是在QSocketNotifier的錯誤。
為了確保插座通知句柄讀通知正確，當你收到通知按照下列步驟操作：
1. 禁用通知。
2. 從套接字讀取數據。
3. 重新啟用的通知，如果您有興趣更多的數據（如經書面一個新的命令到遠程服務器后） 。
為了確保插座通知處理正確地寫通知，當你收到通知按照下列步驟操作：
1. 禁用通知。
2. 寫入盡可能多的數據，你可以（之前`EWOULDBLOCK`返回） 。
3. 重新啟用通知，如果你有更多的數據來寫。
**Further information:**在Windows下，Qt始終禁用通知得到通知后，只有重新啟用它，如果更多的數據的預期。例如，如果數據是從套接字中讀取，它可以被用來讀取更多，或者，如果讀取或寫入是不可能的，因為插座會阻塞，在這種情況下，需要在嘗試重新讀取或寫入之前的等待時間。
* * *
## Type Documentation
```
QSocketNotifier.Type
```
這個枚舉變量描述了不同類型的套接字通知器可以識別的事件。構建插座通知時，必須指定類型。
請注意，如果你需要同時監視讀取和相同的文件描述符寫入，您必須創建兩個socket通知者。另請注意，這是不可能安裝在同一個插座上同類型（讀，寫，異常）的雙插槽通知者。
| Constant | Value | Description |
| --- | --- | --- |
| `QSocketNotifier.Read` | `0` | 有數據被讀取。 |
| `QSocketNotifier.Write` | `1` | 數據可以被寫入。 |
| `QSocketNotifier.Exception` | `2` | 發生異常。我們不建議使用本品。 |
**See also** [QSocketNotifier](qsocketnotifier.html#QSocketNotifier)（）和[type](qsocketnotifier.html#type)（ ） 。
* * *
## Method Documentation
```
QSocketNotifier.__init__ (self, int?socket, Type?type, 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。
構造一個套接字通知給定的_parent_。它使_socket_和手表給定的事件_type_。
它一般最好明確地啟用或禁用該插座通知器，特別是用于寫通知器。
**Note for Windows users:**傳遞到插座[QSocketNotifier](qsocketnotifier.html)將成為非阻塞的，即使它被創建為一個阻塞套接字。
**See also** [setEnabled](qsocketnotifier.html#setEnabled)（）和[isEnabled](qsocketnotifier.html#isEnabled)（ ） 。
```
bool QSocketNotifier.event (self, QEvent)
```
從重新實現[QObject.event](qobject.html#event)（ ） 。
```
bool QSocketNotifier.isEnabled (self)
```
返回True如果通知已啟用，否則返回False 。
**See also** [setEnabled](qsocketnotifier.html#setEnabled)（ ） 。
```
QSocketNotifier.setEnabled (self, bool)
```
這種方法也是一個Qt槽與C + +的簽名`void setEnabled(bool)`。
If _enable_為True，則通知被啟用，否則通知無效。
該通知是默認啟用的，也就是說，它發出的[activated](qsocketnotifier.html#activated)（ ）信號時對應于插座的事件[type](qsocketnotifier.html#type)發生。如果它被禁用，它會忽略插座事件（同樣的效果不是創建套接字通知） 。
寫通知者一般應后立即停用[activated](qsocketnotifier.html#activated)（）信號已經發出
**See also** [isEnabled](qsocketnotifier.html#isEnabled)（）和[activated](qsocketnotifier.html#activated)（ ） 。
```
int QSocketNotifier.socket (self)
```
返回指定給構造函數的接口標識符。
**See also** [type](qsocketnotifier.html#type)（ ） 。
```
Type QSocketNotifier.type (self)
```
[
返回指定給構造函數的套接字事件類型。
](qsocketnotifier.html#Type-enum)
[**See also**](qsocketnotifier.html#Type-enum) [socket](qsocketnotifier.html#socket)（ ） 。
* * *
## Qt Signal Documentation
```
void activated (int)
```
這是該信號的默認超載。
這個信號被發射時的插座通知器被啟用，并且套接字事件對應于其[type](qsocketnotifier.html#Type-enum)發生。
套接字標識符傳遞的_socket_參數。
**See also** [type](qsocketnotifier.html#type)（）和[socket](qsocketnotifier.html#socket)（ ） 。
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- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- 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