# QMetaMethod Class Reference
## [[QtCore](index.htm) module]
该QMetaMethod类提供的成员函数的元数据。[More...](#details)
### Types
* `enum Access { Private, Protected, Public }`
* `enum MethodType { Method, Signal, Slot, Constructor }`
### Methods
* `__init__ (self)`
* `__init__ (self, QMetaMethod)`
* `Access access (self)`
* `object invoke (self, QObject object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))`
* `object invoke (self, QObject object, QGenericReturnArgument returnValue, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))`
* `object invoke (self, QObject object, Qt.ConnectionType connectionType, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))`
* `object invoke (self, QObject object, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))`
* `int methodIndex (self)`
* `MethodType methodType (self)`
* `list-of-QByteArray parameterNames (self)`
* `list-of-QByteArray parameterTypes (self)`
* `str signature (self)`
* `str tag (self)`
* `str typeName (self)`
* * *
## Detailed Description
该QMetaMethod类提供的成员函数的元数据。
一个QMetaMethod有[methodType](qmetamethod.html#methodType)()的一个[signature](qmetamethod.html#signature)( )的列表[parameterTypes](qmetamethod.html#parameterTypes)()和[parameterNames](qmetamethod.html#parameterNames)( ) ,返回[typeName](qmetamethod.html#typeName)()的一个[tag](qmetamethod.html#tag)() ,和一个[access](qmetamethod.html#access)( )说明。您可以使用[invoke](qmetamethod.html#invoke)( )来调用方法上的任意[QObject](qobject.html)。
的方法,将只登记了元对象系统,如果它是一个槽,一个信号,或者与所声明的[Q_INVOKABLE](qobject.html#Q_INVOKABLE)宏。构造也可以与注册[Q_INVOKABLE](qobject.html#Q_INVOKABLE)。
* * *
## Type Documentation
```
QMetaMethod.Access
```
这个枚举变量描述的方法的访问级别,下面在C + +中使用的约定。
| Constant | Value |
| --- | --- |
| `QMetaMethod.Private` | `0` |
| `QMetaMethod.Protected` | `1` |
| `QMetaMethod.Public` | `2` |
```
QMetaMethod.MethodType
```
| Constant | Value | Description |
| --- | --- | --- |
| `QMetaMethod.Method` | `0` | 该函数是一个普通的成员函数。 |
| `QMetaMethod.Signal` | `1` | 该函数是一个信号。 |
| `QMetaMethod.Slot` | `2` | 该函数是一个槽。 |
| `QMetaMethod.Constructor` | `3` | 该函数是一个构造函数。 |
* * *
## Method Documentation
```
QMetaMethod.__init__ (self)
```
```
QMetaMethod.__init__ (self, QMetaMethod)
```
```
Access QMetaMethod.access (self)
```
[
返回此方法(私有,保护,或公共)的访问规范。
信号始终受到保护,这意味着你只能从类或子类发出它们。
](qmetamethod.html#Access-enum)
[**See also**](qmetamethod.html#Access-enum) [methodType](qmetamethod.html#methodType)( ) 。
```
object QMetaMethod.invoke (self, QObject object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))
```
调用此方法的对象上_object_。返回True如果该成员可被调用。返回False,如果没有这样的成员或参数不匹配。
该调用可以是同步或异步的,这取决于_connectionType_:
* If _connectionType_ is [Qt.DirectConnection](qt.html#ConnectionType-enum), the member will be invoked immediately.
* If _connectionType_ is [Qt.QueuedConnection](qt.html#ConnectionType-enum), a [QEvent](qevent.html) will be posted and the member is invoked as soon as the application enters the main event loop.
* If _connectionType_ is [Qt.AutoConnection](qt.html#ConnectionType-enum), the member is invoked synchronously if _object_ lives in the same thread as the caller; otherwise it will invoke the member asynchronously.
这个方法调用的返回值放在_returnValue_。如果调用是异步的,则返回值无法评估。你可以通过多达十个参数(_val0_,_val1_,_val2_,_val3_,_val4_,_val5_,_val6_,_val7_,_val8_和_val9_)这个方法调用。
[QGenericArgument](qgenericargument.html)和[QGenericReturnArgument](qgenericreturnargument.html)是内部的辅助类。由于信号和槽可以动态调用,则必须使用附上参数[Q_ARG](qmetaobject.html#Q_ARG)()和[Q_RETURN_ARG](qmetaobject.html#Q_RETURN_ARG)( )宏。[Q_ARG](qmetaobject.html#Q_ARG)( )接受一个类型名称和类型的const引用;[Q_RETURN_ARG](qmetaobject.html#Q_RETURN_ARG)( )接受一个类型名称和一个非const引用。
异步调用的[animateClick()](qabstractbutton.html#animateClick)插槽上[QPushButton](qpushbutton.html):
```
int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");
[QMetaMethod](qmetamethod.html) method = metaObject->method(methodIndex);
method.invoke(pushButton, [Qt](qt.html).QueuedConnection);
```
对于异步方法调用时,参数必须是已知Qt的元对象系统类型,因为Qt的需要复制到它们存储在幕后事件的参数。如果您尝试使用一个排队的连接,并收到错误消息
```
[QMetaMethod](qmetamethod.html).invoke: Unable to handle unregistered datatype 'MyType'
```
通话[qRegisterMetaType](qmetatype.html#qRegisterMetaType)()注册的数据类型调用QMetaMethod.invoke ()之前。
要同步调用`compute(QString, int, double)`插槽上的一些任意对象`obj`检索它的返回值:
```
[QString](qstring.html) retVal;
[QByteArray](qbytearray.html) normalizedSignature = [QMetaObject](qmetaobject.html).normalizedSignature("compute(QString, int, double)");
int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);
[QMetaMethod](qmetamethod.html) method = metaObject->method(methodIndex);
method.invoke(obj,
[Qt](qt.html).DirectConnection,
Q_RETURN_ARG([QString](qstring.html), retVal),
Q_ARG([QString](qstring.html), "sqrt"),
Q_ARG(int, 42),
Q_ARG(double, 9.7));
```
[QMetaObject.normalizedSignature](qmetaobject.html#normalizedSignature)()被用在这里,以确保签名的格式是什么调用()期望。例如多馀的空格被删除。
如果“计算”老虎不采取只有一个[QString](qstring.html)一int和一间双人按照指定的顺序,则调用将失败。
**Warning:**这种方法不会测试的参数的有效性:_object_必须是类的实例[QMetaObject](qmetaobject.html)而本[QMetaMethod](qmetamethod.html)已建成使用。该参数必须具有相同的类型的那些预期通过该方法,否则,该行为是未定义的。
**See also** [Q_ARG](qmetaobject.html#Q_ARG)( )[Q_RETURN_ARG](qmetaobject.html#Q_RETURN_ARG)( )[qRegisterMetaType](qmetatype.html#qRegisterMetaType)()和[QMetaObject.invokeMethod](qmetaobject.html#invokeMethod)( ) 。
```
object QMetaMethod.invoke (self, QObject object, QGenericReturnArgument returnValue, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))
```
这个函数的重载[invoke](qmetamethod.html#invoke)( ) 。
此重载始终使用连接类型调用该方法[Qt.AutoConnection](qt.html#ConnectionType-enum)。
```
object QMetaMethod.invoke (self, QObject object, Qt.ConnectionType connectionType, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))
```
这个函数的重载[invoke](qmetamethod.html#invoke)( ) 。
如果该成员的返回值是没有兴趣此重载都可以使用。
```
object QMetaMethod.invoke (self, QObject object, QGenericArgument value0 = QGenericArgument(0,0), QGenericArgument value1 = QGenericArgument(0,0), QGenericArgument value2 = QGenericArgument(0,0), QGenericArgument value3 = QGenericArgument(0,0), QGenericArgument value4 = QGenericArgument(0,0), QGenericArgument value5 = QGenericArgument(0,0), QGenericArgument value6 = QGenericArgument(0,0), QGenericArgument value7 = QGenericArgument(0,0), QGenericArgument value8 = QGenericArgument(0,0), QGenericArgument value9 = QGenericArgument(0,0))
```
这个函数的重载[invoke](qmetamethod.html#invoke)( ) 。
使用的连接类型此重载调用该方法[Qt.AutoConnection](qt.html#ConnectionType-enum)并忽略返回值。
```
int QMetaMethod.methodIndex (self)
```
返回此方法的指数。
此功能被引入Qt的4.6 。
```
MethodType QMetaMethod.methodType (self)
```
[
返回此方法(信号,槽,或方法)的类型。
](qmetamethod.html#MethodType-enum)
[**See also**](qmetamethod.html#MethodType-enum) [access](qmetamethod.html#access)( ) 。
```
list-of-QByteArray QMetaMethod.parameterNames (self)
```
返回参数名称的列表。
**See also** [parameterTypes](qmetamethod.html#parameterTypes)()和[signature](qmetamethod.html#signature)( ) 。
```
list-of-QByteArray QMetaMethod.parameterTypes (self)
```
返回参数类型的列表。
**See also** [parameterNames](qmetamethod.html#parameterNames)()和[signature](qmetamethod.html#signature)( ) 。
```
str QMetaMethod.signature (self)
```
返回此方法的签名(例如,`setValue(double)`) 。
**See also** [parameterTypes](qmetamethod.html#parameterTypes)()和[parameterNames](qmetamethod.html#parameterNames)( ) 。
```
str QMetaMethod.tag (self)
```
返回与此方法关联的标记。
标籤是由公认的特殊宏`moc`这使人们有可能添加有关方法的额外信息。
标籤信息可以在函数声明如下方式添加:
```
#define THISISTESTTAG // tag text
...
private slots:
THISISTESTTAG void testFunc();
```
并且信息可以通过使用如下方式访问:
```
MainWindow win;
win.show();
int functionIndex = win.metaObject()->indexOfSlot("testFunc()");
[QMetaMethod](qmetamethod.html) mm = metaObject()->method(functionIndex);
qDebug() << mm.tag(); // prints THISISTESTTAG
```
就目前而言,`moc`不支持任何特殊的标记。
```
str QMetaMethod.typeName (self)
```
返回此方法的返回类型,或空字符串,如果返回类型是_void_。
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- QResizeEvent Class Reference
- QResource Class Reference
- QRubberBand Class Reference
- QRunnable Class Reference
- QScriptClass Class Reference
- QScriptClassPropertyIterator Class Reference
- QScriptContext Class Reference
- QScriptContextInfo Class Reference
- QScriptEngine Class Reference
- QScriptEngineAgent Class Reference
- QScriptEngineDebugger Class Reference
- QScriptString Class Reference
- QScriptSyntaxCheckResult Class Reference
- QScriptValue Class Reference
- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- 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