# QHostAddress Class Reference
## [[QtNetwork](index.htm) module]
该QHostAddress类提供一个IP地址。[More...](#details)
### Types
* `enum SpecialAddress { Null, Broadcast, LocalHost, LocalHostIPv6, AnyIPv6, Any }`
### Methods
* `__init__ (self)`
* `__init__ (self, SpecialAddress address)`
* `__init__ (self, int ip4Addr)`
* `__init__ (self, QString address)`
* `__init__ (self, 16-tuple-of-int ip6Addr)`
* `__init__ (self, QHostAddress copy)`
* `clear (self)`
* `bool isInSubnet (self, QHostAddress subnet, int netmask)`
* `bool isInSubnet (self, tuple-of-QHostAddress-int subnet)`
* `bool isNull (self)`
* `QAbstractSocket.NetworkLayerProtocol protocol (self)`
* `QString scopeId (self)`
* `setAddress (self, int ip4Addr)`
* `bool setAddress (self, QString address)`
* `setAddress (self, 16-tuple-of-int ip6Addr)`
* `setScopeId (self, QString id)`
* `int toIPv4Address (self)`
* `16-tuple-of-int toIPv6Address (self)`
* `QString toString (self)`
### Static Methods
* `tuple-of-QHostAddress-int parseSubnet (QString subnet)`
### Special Methods
* `bool __eq__ (self, QHostAddress address)`
* `bool __eq__ (self, SpecialAddress address)`
* `int __hash__ (self)`
* `bool __ne__ (self, QHostAddress address)`
* `bool __ne__ (self, SpecialAddress address)`
* * *
## Detailed Description
该QHostAddress类提供一个IP地址。
此类包含IPv4或IPv6地址在一个平台和协议无关的方式。
QHostAddress通常与所使用的[QTcpSocket](qtcpsocket.html),[QTcpServer](qtcpserver.html)和[QUdpSocket](qudpsocket.html)连接到主机或设立一个服务器。
主机地址设置与[setAddress](qhostaddress.html#setAddress)() ,并检索与[toIPv4Address](qhostaddress.html#toIPv4Address)( )[toIPv6Address](qhostaddress.html#toIPv6Address)() ,或[toString](qhostaddress.html#toString)( ) 。您可以检查与类型[protocol](qhostaddress.html#protocol)( ) 。
**Note:**请注意, QHostAddress没有做DNS查找。[QHostInfo](qhostinfo.html)是需要这一点。
该类还支持常见的预定义的地址:[Null](qhostaddress.html#SpecialAddress-enum),[LocalHost](qhostaddress.html#SpecialAddress-enum),[LocalHostIPv6](qhostaddress.html#SpecialAddress-enum),[Broadcast](qhostaddress.html#SpecialAddress-enum)和[Any](qhostaddress.html#SpecialAddress-enum)。
* * *
## Type Documentation
```
QHostAddress.SpecialAddress
```
| Constant | Value | Description |
| --- | --- | --- |
| `QHostAddress.Null` | `0` | 空地址的对象。相当于[QHostAddress](qhostaddress.html#QHostAddress)( ) 。 |
| `QHostAddress.LocalHost` | `2` | 在本地主机的IPv4地址。相当于[QHostAddress](qhostaddress.html)( “127.0.0.1” ) 。 |
| `QHostAddress.LocalHostIPv6` | `3` | IPv6的本地主机地址。相当于[QHostAddress](qhostaddress.html)( “.1” ) 。 |
| `QHostAddress.Broadcast` | `1` | IPv4的广播地址。相当于[QHostAddress](qhostaddress.html)( “255.255.255.255” ) 。 |
| `QHostAddress.Any` | `4` | IPv4的任何地址。相当于[QHostAddress](qhostaddress.html)( “0.0.0.0” ) 。 |
| `QHostAddress.AnyIPv6` | `5` | IPv6的任何地址。相当于[QHostAddress](qhostaddress.html)( “[.](index.html)“ ) 。 |
* * *
## Method Documentation
```
QHostAddress.__init__ (self)
```
构造一个主机地址对象的IP地址为0.0.0.0 。
**See also** [clear](qhostaddress.html#clear)( ) 。
```
QHostAddress.__init__ (self, SpecialAddress address)
```
构造一个主机地址对象的IPv4地址_ip4Addr_。
```
QHostAddress.__init__ (self, int ip4Addr)
```
构造一个主机地址对象的IPv6地址_ip6Addr_。
_ip6Addr_必须是网络字节顺序(大端)一个16字节的数组。
```
QHostAddress.__init__ (self, QString address)
```
构造一个主机地址对象的IPv6地址_ip6Addr_。
```
QHostAddress.__init__ (self, 16-tuple-of-int ip6Addr)
```
构造使用由天然结构中指定的地址的IPv4或IPv6地址_sockaddr_。
**See also** [setAddress](qhostaddress.html#setAddress)( ) 。
```
QHostAddress.__init__ (self, QHostAddress copy)
```
构建了基于字符串的IPv4或IPv6地址_address_(例如, “127.0.0.1” ) 。
**See also** [setAddress](qhostaddress.html#setAddress)( ) 。
```
QHostAddress.clear (self)
```
设置主机地址为0.0.0.0 。
```
bool QHostAddress.isInSubnet (self, QHostAddress subnet, int netmask)
```
返回True如果这个IP是由网络前缀描述的子网_subnet_和网络掩码_netmask_。
一个IP被认为是属于一个子网,如果它包含的最低和该子网中的最高地址。在IP版本4的情况下,最低的地址是网络地址,而最高地址是广播地址。
该_subnet_参数并不一定是实际的网络地址(子网中的最低地址) 。它可以是属于该子网的任何有效的IP地址。特别是,如果它等于通过这个对象持有的IP地址,这个函数将始终返回True (所提供的网络掩码是一个有效的值) 。
此功能被引入Qt的4.5 。
**See also** [parseSubnet](qhostaddress.html#parseSubnet)( ) 。
```
bool QHostAddress.isInSubnet (self, tuple-of-QHostAddress-int subnet)
```
这是一个重载函数。
返回True如果这个IP是由描述的子网_subnet_。该[QHostAddress](qhostaddress.html)成员_subnet_包含网络前缀和整数(二)成员包含子网掩码(前缀长度) 。
此功能被引入Qt的4.5 。
```
bool QHostAddress.isNull (self)
```
返回True如果主机地址为空( INADDR_ANY或IN6ADDR_ANY ) 。默认的构造函数创建一个空的地址,该地址是无效的任何主机或接口。
```
tuple-of-QHostAddress-int QHostAddress.parseSubnet (QString subnet)
```
解析包含在IP和子网信息_subnet_并返回网络前缀的网络前缀长度。
IP地址和网络掩码必须以斜杠( / )分隔。
此功能支持形式参数:
* 123.123.123.123/n where n is any value between 0 and 32
* 123.123.123.123/255.255.255.255
* <ipv6-address>/n where n is any value between 0 and 128
对于IP版本4 ,这个函数接受以及缺少结尾的部分(即,小于4个字节,如“ 192.168.1 ” ),其次或不点。如果子网掩码也在这种情况下丢失,它被设置为实际传递的字节数(在上面的例子中,这将是24 ,为3个八比特组) 。
此功能被引入Qt的4.5 。
**See also** [isInSubnet](qhostaddress.html#isInSubnet)( ) 。
```
QAbstractSocket.NetworkLayerProtocol QHostAddress.protocol (self)
```
[
返回主机地址中的网络层协议。
```
QString QHostAddress.scopeId (self)
```
](qabstractsocket.html#NetworkLayerProtocol-enum)
[返回一个IPv6地址的范围ID 。对于IPv4地址,或者地址不包含范围ID ,一个空](qabstractsocket.html#NetworkLayerProtocol-enum)[QString](qstring.html)返回。
IPv6的范围ID指定的范围_reachability_对于非全局IPv6地址,限制在其中的地址可使用的区域。所有的IPv6地址与这样的可达范围有关。范围ID被用来消除那些不能保证是全局唯一的地址。
的IPv6指定了以下四个层次的可达性:
* Node-local: Addresses that are only used for communicating with services on the same interface (e.g., the loopback interface ".1").
* Link-local: Addresses that are local to the network interface (_link_). There is always one link-local address for each IPv6 interface on your host. Link-local addresses ("fe80...") are generated from the MAC address of the local network adaptor, and are not guaranteed to be unique.
* Site-local: Addresses that are local to the site / private network (e.g., the company intranet). Site-local addresses ("fec0...") are usually distributed by the site router, and are not guaranteed to be unique outside of the local site.
* Global: For globally routable addresses, such as public servers on the Internet.
当使用链路本地和站点本地地址的IPv6连接,则必须指定范围ID 。一个链路本地地址的范围ID通常是相同的接口名称(例如,“ eth0的” , “ EN1 ” )或数字(例如, “ 1 ” , “2” ) 。
这个函数是Qt 4.1中引入。
**See also** [setScopeId](qhostaddress.html#setScopeId)( ) 。
```
QHostAddress.setAddress (self, int ip4Addr)
```
通过设置指定的IPv4地址_ip4Addr_。
```
bool QHostAddress.setAddress (self, QString address)
```
这是一个重载函数。
通过设置指定的IPv6地址_ip6Addr_。
_ip6Addr_必须是网络字节顺序(高位字节在前) 16字节的数组。
```
QHostAddress.setAddress (self, 16-tuple-of-int ip6Addr)
```
这是一个重载函数。
通过设置指定的IPv6地址_ip6Addr_。
```
QHostAddress.setScopeId (self, QString id)
```
设置地址的IPv6范围ID来_id_。如果地址协议是不支持IPv6 ,这个函数不执行任何操作。
这个函数是Qt 4.1中引入。
**See also** [scopeId](qhostaddress.html#scopeId)( ) 。
```
int QHostAddress.toIPv4Address (self)
```
返回的IPv4地址为一个数字。
例如,如果地址是127.0.0.1 ,则返回值是2130706433 (即0x7f000001 ) 。
此值才有效,如果该协议( )是[IPv4Protocol](qabstractsocket.html#NetworkLayerProtocol-enum)。
**See also** [toString](qhostaddress.html#toString)( ) 。
```
16-tuple-of-int QHostAddress.toIPv6Address (self)
```
返回IPv6地址作为Q_IPV6ADDR结构。该结构由16位无符号的字符。
```
Q_IPV6ADDR addr = hostAddr.toIPv6Address();
// addr contains 16 unsigned characters
for (int i = 0; i < 16; ++i) {
// process addr[i]
}
```
此值才有效,如果[protocol](qhostaddress.html#protocol)()是[IPv6Protocol](qabstractsocket.html#NetworkLayerProtocol-enum)。
**See also** [toString](qhostaddress.html#toString)( ) 。
```
QString QHostAddress.toString (self)
```
返回该地址为一个字符串。
例如,如果该地址是IPv4地址127.0.0.1 ,则返回的字符串为“ 127.0.0.1” 。对于IPv6的字符串格式将遵循RFC5952建议。
**See also** [toIPv4Address](qhostaddress.html#toIPv4Address)( ) 。
```
bool QHostAddress.__eq__ (self, QHostAddress address)
```
```
bool QHostAddress.__eq__ (self, SpecialAddress address)
```
```
int QHostAddress.__hash__ (self)
```
```
bool QHostAddress.__ne__ (self, QHostAddress address)
```
```
bool QHostAddress.__ne__ (self, SpecialAddress address)
```
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- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译:Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- 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