# QSocketNotifier Class Reference
## [[QtCore](index.htm) module]
该QSocketNotifier类提供了一个文件描述符监测活动的支持。[More...](#details)
继承[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
该QSocketNotifier类提供了一个文件描述符监测活动的支持。
该QSocketNotifier使得能够整合Qt的事件循环与基于文件描述符其他事件循环。例如，本 [CORBA Framework](http://qt.digia.com/products/add-on-products/catalog/4/Utilities/qtcorba/)使用它来处理CORBA的事件。在Qt的主事件循环（当检测到文件描述符行动[QCoreApplication.exec](qcoreapplication.html#exec)（））。
一旦你已经使用一个低级别（通常特定于平台）的API打开一个设备，你可以创建一个socket通知监视的文件描述符。该插座通知是默认启用的，也就是说，它发出的[activated](qsocketnotifier.html#activated)（ ）信号时对应其类型的套接字事件发生。连接[activated](qsocketnotifier.html#activated)（）信号，要在对应的插槽通知的类型的事件发生时要调用的插槽。
有三种类型的套接字通知者的：读，写和异常。类型由所描述的[Type](qsocketnotifier.html#Type-enum)枚举，而且必须构建插座通知时指定。项目建成后可利用装置[type](qsocketnotifier.html#type)（）函数。请注意，如果你需要同时监视读取和相同的文件描述符写入，您必须创建两个socket通知者。还请注意，这是不可能安装相同类型的两个插座通知器（[Read](qsocketnotifier.html#Type-enum)，[Write](qsocketnotifier.html#Type-enum)，[Exception](qsocketnotifier.html#Type-enum)）在同一个插座上。
该[setEnabled](qsocketnotifier.html#setEnabled)（ ）函数允许你禁用和启用套接字通知。它一般最好明确地启用或禁用该插座通知器，特别是用于写通知器。停用的通知忽略套接字事件（同样的效果不是创建套接字通知） 。使用[isEnabled](qsocketnotifier.html#isEnabled)（ ）函数来确定通知的当前状态。
最后，您可以使用[socket](qsocketnotifier.html#socket)（ ）函数来获取套接字标识符。虽然该类称为QSocketNotifier ，它通常是用于其它类型的设备比套接字。[QTcpSocket](qtcpsocket.html)和[QUdpSocket](qudpsocket.html)通过信号提供通知，所以通常没有必要对他们使用QSocketNotifier 。
### Notes for Windows Users
传递给QSocketNotifier插座将成为不可阻挡，即使它被创建为一个阻塞套接字。该[activated](qsocketnotifier.html#activated)（）信号是由主机上的高活性一般有时触发，即使没有要读出。然后从插座后续读取可能会失败，错误表明有可用（例如，没有数据，`WSAEWOULDBLOCK`） 。这是一个操作系统的限制，而不是在QSocketNotifier的错误。
为了确保插座通知句柄读通知正确，当你收到通知按照下列步骤操作：
1. 禁用通知。
2. 从套接字读取数据。
3. 重新启用的通知，如果您有兴趣更多的数据（如经书面一个新的命令到远程服务器后） 。
为了确保插座通知处理正确地写通知，当你收到通知按照下列步骤操作：
1. 禁用通知。
2. 写入尽可能多的数据，你可以（之前`EWOULDBLOCK`返回） 。
3. 重新启用通知，如果你有更多的数据来写。
**Further information:**在Windows下，Qt始终禁用通知得到通知后，只有重新启用它，如果更多的数据的预期。例如，如果数据是从套接字中读取，它可以被用来读取更多，或者，如果读取或写入是不可能的，因为插座会阻塞，在这种情况下，需要在尝试重新读取或写入之前的等待时间。
* * *
## Type Documentation
```
QSocketNotifier.Type
```
这个枚举变量描述了不同类型的套接字通知器可以识别的事件。构建插座通知时，必须指定类型。
请注意，如果你需要同时监视读取和相同的文件描述符写入，您必须创建两个socket通知者。另请注意，这是不可能安装在同一个插座上同类型（读，写，异常）的双插槽通知者。
| Constant | Value | Description |
| --- | --- | --- |
| `QSocketNotifier.Read` | `0` | 有数据被读取。 |
| `QSocketNotifier.Write` | `1` | 数据可以被写入。 |
| `QSocketNotifier.Exception` | `2` | 发生异常。我们不建议使用本品。 |
**See also** [QSocketNotifier](qsocketnotifier.html#QSocketNotifier)（）和[type](qsocketnotifier.html#type)（ ） 。
* * *
## Method Documentation
```
QSocketNotifier.__init__ (self, int socket, Type type, QObject parent = None)
```
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。
构造一个套接字通知给定的_parent_。它使_socket_和手表给定的事件_type_。
它一般最好明确地启用或禁用该插座通知器，特别是用于写通知器。
**Note for Windows users:**传递到插座[QSocketNotifier](qsocketnotifier.html)将成为非阻塞的，即使它被创建为一个阻塞套接字。
**See also** [setEnabled](qsocketnotifier.html#setEnabled)（）和[isEnabled](qsocketnotifier.html#isEnabled)（ ） 。
```
bool QSocketNotifier.event (self, QEvent)
```
从重新实现[QObject.event](qobject.html#event)（ ） 。
```
bool QSocketNotifier.isEnabled (self)
```
返回True如果通知已启用，否则返回False 。
**See also** [setEnabled](qsocketnotifier.html#setEnabled)（ ） 。
```
QSocketNotifier.setEnabled (self, bool)
```
这种方法也是一个Qt槽与C + +的签名`void setEnabled(bool)`。
If _enable_为True，则通知被启用，否则通知无效。
该通知是默认启用的，也就是说，它发出的[activated](qsocketnotifier.html#activated)（ ）信号时对应于插座的事件[type](qsocketnotifier.html#type)发生。如果它被禁用，它会忽略插座事件（同样的效果不是创建套接字通知） 。
写通知者一般应后立即停用[activated](qsocketnotifier.html#activated)（）信号已经发出
**See also** [isEnabled](qsocketnotifier.html#isEnabled)（）和[activated](qsocketnotifier.html#activated)（ ） 。
```
int QSocketNotifier.socket (self)
```
返回指定给构造函数的接口标识符。
**See also** [type](qsocketnotifier.html#type)（ ） 。
```
Type QSocketNotifier.type (self)
```
[
返回指定给构造函数的套接字事件类型。
](qsocketnotifier.html#Type-enum)
[**See also**](qsocketnotifier.html#Type-enum) [socket](qsocketnotifier.html#socket)（ ） 。
* * *
## Qt Signal Documentation
```
void activated (int)
```
这是该信号的默认超载。
这个信号被发射时的插座通知器被启用，并且套接字事件对应于其[type](qsocketnotifier.html#Type-enum)发生。
套接字标识符传递的_socket_参数。
**See also** [type](qsocketnotifier.html#type)（）和[socket](qsocketnotifier.html#socket)（ ） 。
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- 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