# QMetaObject Class Reference
## [[QtCore](index.htm) module]
該QMetaObject類包含有關Qt對象的元信息。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QMetaObject)`
* `QMetaClassInfo classInfo (self, int?index)`
* `int classInfoCount (self)`
* `int classInfoOffset (self)`
* `str className (self)`
* `QMetaMethod constructor (self, int?index)`
* `int constructorCount (self)`
* `QMetaEnum enumerator (self, int?index)`
* `int enumeratorCount (self)`
* `int enumeratorOffset (self)`
* `int indexOfClassInfo (self, str?name)`
* `int indexOfConstructor (self, str?constructor)`
* `int indexOfEnumerator (self, str?name)`
* `int indexOfMethod (self, str?method)`
* `int indexOfProperty (self, str?name)`
* `int indexOfSignal (self, str?signal)`
* `int indexOfSlot (self, str?slot)`
* `QMetaMethod method (self, int?index)`
* `int methodCount (self)`
* `int methodOffset (self)`
* `QObject newInstance (self, 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))`
* `QMetaProperty property (self, int?index)`
* `int propertyCount (self)`
* `int propertyOffset (self)`
* `QMetaObject superClass (self)`
* `QMetaProperty userProperty (self)`
### Static Methods
* `bool checkConnectArgs (str?signal, str?method)`
* `connectSlotsByName (QObject?o)`
* `object invokeMethod (QObject?obj, str?member, Qt.ConnectionType?type, QGenericReturnArgument?ret, 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 invokeMethod (QObject?obj, str?member, QGenericReturnArgument?ret, 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 invokeMethod (QObject?obj, str?member, Qt.ConnectionType?type, 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 invokeMethod (QObject?obj, str?member, 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))`
* `QByteArray normalizedSignature (str?method)`
* `QByteArray normalizedType (str?type)`
* * *
## Detailed Description
該QMetaObject類包含有關Qt對象的元信息。
Qt的[Meta-Object System](index.htm#meta-object-system)在Qt是負責信號和槽的對象間通信機制,運行時類型信息,而Qt的屬性系統。單QMetaObject實例為每個創建[QObject](qobject.html)子類,用于在應用程序中,并且該實例存儲所有的元信息的[QObject](qobject.html)子類。該對象可作為[QObject.metaObject](qobject.html#metaObject)( ) 。
此類不正常所需的應用程序,但如果你寫的元應用,如腳本引擎或GUI構建器是有用的。
你是最有可能找到有用的功能是這些:
* [className](qmetaobject.html#className)() returns the name of a class.
* [superClass](qmetaobject.html#superClass)() returns the superclass's meta-object.
* [method](qmetaobject.html#method)() and [methodCount](qmetaobject.html#methodCount)() provide information about a class's meta-methods (signals, slots and other [invokable](qobject.html#Q_INVOKABLE) member functions).
* [enumerator](qmetaobject.html#enumerator)() and [enumeratorCount](qmetaobject.html#enumeratorCount)() and provide information about a class's enumerators.
* [propertyCount](qmetaobject.html#propertyCount)() and [property](qmetaobject.html#property)() provide information about a class's properties.
* [constructor](qmetaobject.html#constructor)() and [constructorCount](qmetaobject.html#constructorCount)() provide information about a class's meta-constructors.
該指數函數[indexOfConstructor](qmetaobject.html#indexOfConstructor)( )[indexOfMethod](qmetaobject.html#indexOfMethod)( )[indexOfEnumerator](qmetaobject.html#indexOfEnumerator)()和[indexOfProperty](qmetaobject.html#indexOfProperty)( )構造函數,成員函數,枚舉或屬性索引的元對象的映射名稱。舉例來說, Qt使用[indexOfMethod](qmetaobject.html#indexOfMethod)( )內部,當你連接一個信號到一個槽。
類也可以有一個列表_name_ - _value_對其他的類信息,存儲在[QMetaClassInfo](qmetaclassinfo.html)對象。對的數目是由返回[classInfoCount](qmetaobject.html#classInfoCount)() ,單一對被返回[classInfo](qmetaobject.html#classInfo)( ) ,您可以搜索與配對[indexOfClassInfo](qmetaobject.html#indexOfClassInfo)( ) 。
* * *
## Method Documentation
```
QMetaObject.__init__ (self)
```
```
QMetaObject.__init__ (self, QMetaObject)
```
```
bool QMetaObject.checkConnectArgs (str?signal, str?method)
```
返回True如果_signal_和_method_參數是兼容的,否則返回False 。
Both _signal_和_method_預期將被歸一化。
**See also** [normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
```
QMetaClassInfo QMetaObject.classInfo (self, int?index)
```
[
用給定的返回的元數據的類別信息的項目_index_。
例如:
](qmetaclassinfo.html)
```
class MyClass : publicQObject
{
Q_OBJECT
Q_CLASSINFO("author", "Sabrina Schweinsteiger")
Q_CLASSINFO("url", "http://doc.moosesoft.co.uk/1.0/")
public:
...
};
```
**See also** [classInfoCount](qmetaobject.html#classInfoCount)( )[classInfoOffset](qmetaobject.html#classInfoOffset)()和[indexOfClassInfo](qmetaobject.html#indexOfClassInfo)( ) 。
```
int QMetaObject.classInfoCount (self)
```
返回類信息的項目在這個類別的數量。
**See also** [classInfo](qmetaobject.html#classInfo)( )[classInfoOffset](qmetaobject.html#classInfoOffset)()和[indexOfClassInfo](qmetaobject.html#indexOfClassInfo)( ) 。
```
int QMetaObject.classInfoOffset (self)
```
返回類此信息類抵消,也就是說這個類的第一類信息項的索引位置。
如果類沒有父類與類的信息,偏移量為0 ,否則偏移量是在類的所有超類的類信息項的總和。
**See also** [classInfo](qmetaobject.html#classInfo)( )[classInfoCount](qmetaobject.html#classInfoCount)()和[indexOfClassInfo](qmetaobject.html#indexOfClassInfo)( ) 。
```
str QMetaObject.className (self)
```
返回類的名稱。
**See also** [superClass](qmetaobject.html#superClass)( ) 。
```
QMetaObject.connectSlotsByName (QObject?o)
```
遞歸搜索對于給定的所有子對象_object_,并連接從它們的匹配信號的時隙_object_下面的格式如下:
```
void on_<object name>_<signal name>(<signal parameters>);
```
讓我們假定我們的對象類型的子對象[QPushButton](qpushbutton.html)與[object name](qobject.html#objectName-prop) `button1`。趕上按鈕的插槽`clicked()`信號將是:
```
void on_button1_clicked();
```
**See also** [QObject.setObjectName](qobject.html#objectName-prop)( ) 。
```
QMetaMethod QMetaObject.constructor (self, int?index)
```
[
返回的元數據用于構造具有給定_index_。
此功能被引入Qt的4.5 。
](qmetamethod.html)
[**See also**](qmetamethod.html) [constructorCount](qmetaobject.html#constructorCount)()和[newInstance](qmetaobject.html#newInstance)( ) 。
```
int QMetaObject.constructorCount (self)
```
返回構造函數在這個類的數量。
此功能被引入Qt的4.5 。
**See also** [constructor](qmetaobject.html#constructor)()和[indexOfConstructor](qmetaobject.html#indexOfConstructor)( ) 。
```
QMetaEnum QMetaObject.enumerator (self, int?index)
```
[
返回的元數據枚舉給定的_index_。
](qmetaenum.html)
[**See also**](qmetaenum.html) [enumeratorCount](qmetaobject.html#enumeratorCount)( )[enumeratorOffset](qmetaobject.html#enumeratorOffset)()和[indexOfEnumerator](qmetaobject.html#indexOfEnumerator)( ) 。
```
int QMetaObject.enumeratorCount (self)
```
返回普查員在這個類的數量。
**See also** [enumerator](qmetaobject.html#enumerator)( )[enumeratorOffset](qmetaobject.html#enumeratorOffset)()和[indexOfEnumerator](qmetaobject.html#indexOfEnumerator)( ) 。
```
int QMetaObject.enumeratorOffset (self)
```
返回枚舉這個類的偏移,即這個類的第一個枚舉的索引位置。
如果類沒有父類與枚舉,偏移量為0 ,否則偏移在類的超類的所有統計員的總和。
**See also** [enumerator](qmetaobject.html#enumerator)( )[enumeratorCount](qmetaobject.html#enumeratorCount)()和[indexOfEnumerator](qmetaobject.html#indexOfEnumerator)( ) 。
```
int QMetaObject.indexOfClassInfo (self, str?name)
```
查找類信息項_name_并返回其索引,否則返回-1 。
**See also** [classInfo](qmetaobject.html#classInfo)( )[classInfoCount](qmetaobject.html#classInfoCount)()和[classInfoOffset](qmetaobject.html#classInfoOffset)( ) 。
```
int QMetaObject.indexOfConstructor (self, str?constructor)
```
Finds _constructor_并返回其索引,否則返回-1 。
注意,這個_constructor_必須以標準化形式,如通過返回[normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
此功能被引入Qt的4.5 。
**See also** [constructor](qmetaobject.html#constructor)( )[constructorCount](qmetaobject.html#constructorCount)()和[normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
```
int QMetaObject.indexOfEnumerator (self, str?name)
```
查找枚舉_name_并返回其索引,否則返回-1 。
**See also** [enumerator](qmetaobject.html#enumerator)( )[enumeratorCount](qmetaobject.html#enumeratorCount)()和[enumeratorOffset](qmetaobject.html#enumeratorOffset)( ) 。
```
int QMetaObject.indexOfMethod (self, str?method)
```
Finds _method_并返回其索引,否則返回-1 。
注意,這個_method_必須以標準化形式,如通過返回[normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
**See also** [method](qmetaobject.html#method)( )[methodCount](qmetaobject.html#methodCount)( )[methodOffset](qmetaobject.html#methodOffset)()和[normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
```
int QMetaObject.indexOfProperty (self, str?name)
```
認定財產_name_并返回其索引,否則返回-1 。
**See also** [property](qmetaobject.html#property)( )[propertyCount](qmetaobject.html#propertyCount)()和[propertyOffset](qmetaobject.html#propertyOffset)( ) 。
```
int QMetaObject.indexOfSignal (self, str?signal)
```
Finds _signal_并返回其索引,否則返回-1 。
這是相同的[indexOfMethod](qmetaobject.html#indexOfMethod)() ,不同之處在于它會返回-1,如果存在的方法,但不是一個信號。
注意,這個_signal_必須以標準化形式,如通過返回[normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
**See also** [indexOfMethod](qmetaobject.html#indexOfMethod)( )[normalizedSignature](qmetaobject.html#normalizedSignature)( )[method](qmetaobject.html#method)( )[methodCount](qmetaobject.html#methodCount)()和[methodOffset](qmetaobject.html#methodOffset)( ) 。
```
int QMetaObject.indexOfSlot (self, str?slot)
```
Finds _slot_并返回其索引,否則返回-1 。
這是相同的[indexOfMethod](qmetaobject.html#indexOfMethod)() ,不同之處在于它會返回-1,如果存在的方法,但不是一個時隙。
**See also** [indexOfMethod](qmetaobject.html#indexOfMethod)( )[method](qmetaobject.html#method)( )[methodCount](qmetaobject.html#methodCount)()和[methodOffset](qmetaobject.html#methodOffset)( ) 。
```
object QMetaObject.invokeMethod (QObject?obj, str?member, Qt.ConnectionType?type, QGenericReturnArgument?ret, 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))
```
調用_member_在對象上(一個信號或一個時隙名)_obj_。返回True如果該成員可被調用。返回False,如果沒有這樣的成員或參數不匹配。
該調用可以是同步或異步的,這取決于_type_:
* If _type_ is [Qt.DirectConnection](qt.html#ConnectionType-enum), the member will be invoked immediately.
* If _type_ is [Qt.QueuedConnection](qt.html#ConnectionType-enum), a [QEvent](qevent.html) will be sent and the member is invoked as soon as the application enters the main event loop.
* If _type_ is [Qt.BlockingQueuedConnection](qt.html#ConnectionType-enum), the method will be invoked in the same way as for [Qt.QueuedConnection](qt.html#ConnectionType-enum), except that the current thread will block until the event is delivered. Using this connection type to communicate between objects in the same thread will lead to deadlocks.
* If _type_ is [Qt.AutoConnection](qt.html#ConnectionType-enum), the member is invoked synchronously if _obj_ lives in the same thread as the caller; otherwise it will invoke the member asynchronously.
的返回值_member_函數調用被放置在_ret_。如果調用是異步的,則返回值無法評估。你可以通過多達十個參數(_val0_,_val1_,_val2_,_val3_,_val4_,_val5_,_val6_,_val7_,_val8_和_val9_)到_member_功能。
[QGenericArgument](qgenericargument.html)和[QGenericReturnArgument](qgenericreturnargument.html)是內部的輔助類。由于信號和槽可以動態調用,則必須使用附上參數[Q_ARG](qmetaobject.html#Q_ARG)()和[Q_RETURN_ARG](qmetaobject.html#Q_RETURN_ARG)( )宏。[Q_ARG](qmetaobject.html#Q_ARG)( )接受一個類型名稱和類型的const引用;[Q_RETURN_ARG](qmetaobject.html#Q_RETURN_ARG)( )接受一個類型名稱和一個非const引用。
您只需要在信號或插槽的名稱傳遞給這個函數,而不是整個簽名。例如,異步調用[animateClick()](qabstractbutton.html#animateClick)插槽上[QPushButton](qpushbutton.html),使用下面的代碼:
```
[QMetaObject](qmetaobject.html).invokeMethod(pushButton, "animateClick",
[Qt](qt.html).QueuedConnection);
```
對于異步方法調用時,參數必須是已知Qt的元對象系統類型,因為Qt的需要復制到它們存儲在幕后事件的參數。如果您嘗試使用一個排隊的連接,并收到錯誤消息
```
[QMetaObject](qmetaobject.html).invokeMethod: Unable to handle unregistered datatype 'MyType'
```
通話[qRegisterMetaType](qmetatype.html#qRegisterMetaType)()注冊的數據類型調用的invokeMethod ()之前。
要同步調用`compute(QString, int, double)`插槽上的一些任意對象`obj`檢索它的返回值:
```
[QString](qstring.html) retVal;
[QMetaObject](qmetaobject.html).invokeMethod(obj, "compute", [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));
```
如果“計算”老虎不采取只有一個[QString](qstring.html)一int和一間雙人按照指定的順序,則調用將失敗。
**See also** [Q_ARG](qmetaobject.html#Q_ARG)( )[Q_RETURN_ARG](qmetaobject.html#Q_RETURN_ARG)( )[qRegisterMetaType](qmetatype.html#qRegisterMetaType)()和[QMetaMethod.invoke](qmetamethod.html#invoke)( ) 。
```
object QMetaObject.invokeMethod (QObject?obj, str?member, QGenericReturnArgument?ret, 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))
```
這個函數的重載[invokeMethod](qmetaobject.html#invokeMethod)( ) 。
此重載始終使用連接類型調用成員[Qt.AutoConnection](qt.html#ConnectionType-enum)。
```
object QMetaObject.invokeMethod (QObject?obj, str?member, Qt.ConnectionType?type, 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))
```
這個函數的重載[invokeMethod](qmetaobject.html#invokeMethod)( ) 。
如果該成員的返回值是沒有興趣此重載都可以使用。
```
object QMetaObject.invokeMethod (QObject?obj, str?member, 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))
```
這個函數的重載[invokeMethod](qmetaobject.html#invokeMethod)( ) 。
使用的連接類型此重載調用成員[Qt.AutoConnection](qt.html#ConnectionType-enum)并忽略返回值。
```
QMetaMethod QMetaObject.method (self, int?index)
```
[
返回的元數據的方法,用給定的_index_。
](qmetamethod.html)
[**See also**](qmetamethod.html) [methodCount](qmetaobject.html#methodCount)( )[methodOffset](qmetaobject.html#methodOffset)()和[indexOfMethod](qmetaobject.html#indexOfMethod)( ) 。
```
int QMetaObject.methodCount (self)
```
返回在這個類中已知的元對象系統的方法數,包括每一個基類提供的屬性的數量。這些措施包括信號和槽以及與聲明的成員函數[Q_INVOKABLE](qobject.html#Q_INVOKABLE)宏。
使用如下所示的代碼來獲得[QStringList](qstringlist.html)包含特定于給定類中的方法:
```
const [QMetaObject](qmetaobject.html)* metaObject = obj->metaObject();
[QStringList](qstringlist.html) methods;
for(int i = metaObject->methodOffset(); i < metaObject->methodCount(); ++i)
methods << [QString](qstring.html).fromLatin1(metaObject->method(i).signature());
```
**See also** [method](qmetaobject.html#method)( )[methodOffset](qmetaobject.html#methodOffset)()和[indexOfMethod](qmetaobject.html#indexOfMethod)( ) 。
```
int QMetaObject.methodOffset (self)
```
返回方法這個類的偏移,即這個類的一個成員函數的索引位置。
偏移量是在類的超類的所有方法(之和這始終是積極的,因為[QObject](qobject.html)有deleteLater ()槽和銷毀( )信號) 。
**See also** [method](qmetaobject.html#method)( )[methodCount](qmetaobject.html#methodCount)()和[indexOfMethod](qmetaobject.html#indexOfMethod)( ) 。
```
QObject QMetaObject.newInstance (self, 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))
```
[
構造此類的一個新實例。你可以通過多達十個參數(_val0_,_val1_,_val2_,_val3_,_val4_,_val5_,_val6_,_val7_,_val8_和_val9_)給構造函數。返回新對象,或者0,如果沒有合適的構造函數是可用的。
](qobject.html)
[請注意,只有建構與該聲明](qobject.html)[Q_INVOKABLE](qobject.html#Q_INVOKABLE)改性劑是通過元對象系統提供。
此功能被引入Qt的4.5 。
**See also** [Q_ARG](qmetaobject.html#Q_ARG)()和[constructor](qmetaobject.html#constructor)( ) 。
```
QByteArray QMetaObject.normalizedSignature (str?method)
```
[
歸一給定的簽名_method_。
Qt使用歸一化簽名來決定兩個給定信號和槽是否兼容。正常化減少空白到最低限度,移動'常量'到前面在適當情況下,刪除'常量'的值類型和替換值的常量引用。
](qbytearray.html)
[**See also**](qbytearray.html) [checkConnectArgs](qmetaobject.html#checkConnectArgs)()和[normalizedType](qmetaobject.html#normalizedType)( ) 。
```
QByteArray QMetaObject.normalizedType (str?type)
```
[
歸一_type_。
](qbytearray.html)
[See](qbytearray.html) [QMetaObject.normalizedSignature](qmetaobject.html#normalizedSignature)( )上的Qt如何標準化的描述。
例如:
```
[QByteArray](qbytearray.html) normType = [QMetaObject](qmetaobject.html).normalizedType(" int const *");
// normType is now "const int*"
```
這個函數中引入了Qt 4.2中。
**See also** [normalizedSignature](qmetaobject.html#normalizedSignature)( ) 。
```
QMetaProperty QMetaObject.property (self, int?index)
```
[](qmetaproperty.html)
[用給定的返回的元數據的屬性_index_。如果沒有這樣的屬性存在,空](qmetaproperty.html)[QMetaProperty](qmetaproperty.html)返回。
**See also** [propertyCount](qmetaobject.html#propertyCount)( )[propertyOffset](qmetaobject.html#propertyOffset)()和[indexOfProperty](qmetaobject.html#indexOfProperty)( ) 。
```
int QMetaObject.propertyCount (self)
```
返回這個類的屬性的數量,包括每一個基類提供的屬性的數量。
使用如下所示的代碼來獲得[QStringList](qstringlist.html)包含特定于某個給定的類的屬性:
```
const [QMetaObject](qmetaobject.html)* metaObject = obj->metaObject();
[QStringList](qstringlist.html) properties;
for(int i = metaObject->propertyOffset(); i < metaObject->propertyCount(); ++i)
properties << [QString](qstring.html).fromLatin1(metaObject->property(i).name());
```
**See also** [property](qmetaobject.html#property)( )[propertyOffset](qmetaobject.html#propertyOffset)()和[indexOfProperty](qmetaobject.html#indexOfProperty)( ) 。
```
int QMetaObject.propertyOffset (self)
```
返回屬性為這個類的偏移,即這個類的第一個屬性的索引位置。
偏移量是在類的超類的所有屬性的總和(這始終是積極的,因為[QObject](qobject.html)具有()的名稱屬性) 。
**See also** [property](qmetaobject.html#property)( )[propertyCount](qmetaobject.html#propertyCount)()和[indexOfProperty](qmetaobject.html#indexOfProperty)( ) 。
```
QMetaObject QMetaObject.superClass (self)
```
[
返回超類,或0的元對象,如果沒有這樣的對象。
](qmetaobject.html)
[**See also**](qmetaobject.html) [className](qmetaobject.html#className)( ) 。
```
QMetaProperty QMetaObject.userProperty (self)
```
[
返回具有該屬性的`USER`標志設置為True 。
這個函數中引入了Qt 4.2中。
](qmetaproperty.html)
[**See also**](qmetaproperty.html) [QMetaProperty.isUser](qmetaproperty.html#isUser)( ) 。
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- Reference
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