# QMetaType Class Reference
## [[QtCore](index.htm) module]
該QMetaType類管理的元對象系統中命名類型。[More...](#details)
### Types
* `enum Type { Void, Bool, Int, UInt, ..., User }`
### Methods
* `__init__ (self)`
* `__init__ (self, QMetaType)`
### Static Methods
* `bool isRegistered (int?type)`
* `int type (str?typeName)`
* `str typeName (int?type)`
* * *
## Detailed Description
該QMetaType類管理的元對象系統中命名類型。
這個類被用作輔助馬歇爾類型[QVariant](qmetatype.html#Type-enum)而在排隊的信號和槽的連接。它關聯一個類型名的類型，以便它可以被創建并在運行時動態地破壞。聲明新類型的[Q_DECLARE_METATYPE](qmetatype.html#Q_DECLARE_METATYPE)（ ） ，使他們能夠提供[QVariant](qmetatype.html#Type-enum)與其他基于模板的功能。通話[qRegisterMetaType](qmetatype.html#qRegisterMetaType)（）以提供給非基于模板的功能，諸如排隊的信號和槽的連接類型。
任何類或結構有一個公共的默認構造函數，公共拷貝構造函數和析構函數市民可以注冊。
下面的代碼分配和解構的一個實例`MyClass`：
```
int id = QMetaType.type("MyClass");
if (id != 0) {
void *myClassPtr = QMetaType.construct(id);
...
QMetaType.destroy(id, myClassPtr);
myClassPtr = 0;
}
```
如果我們想在流運算符`operator<<()`和`operator>>()`工作在[QVariant](qmetatype.html#Type-enum)存儲自定義類型的對象，自定義類型必須提供`operator<<()`和`operator>>()`運營商。
* * *
## Type Documentation
```
QMetaType.Type
```
這些是由所支持的內置類型[QMetaType](qmetatype.html)：
| Constant | Value | Description |
| --- | --- | --- |
| `QMetaType.Void` | `0` | `void` |
| `QMetaType.Bool` | `1` | `bool` |
| `QMetaType.Int` | `2` | `int` |
| `QMetaType.UInt` | `3` | `unsigned int` |
| `QMetaType.Double` | `6` | `double` |
| `QMetaType.QChar` | `7` | QChar |
| `QMetaType.QString` | `10` | QString的 |
| `QMetaType.QByteArray` | `12` | QByteArray中 |
| `QMetaType.VoidStar` | `128` | `void *` |
| `QMetaType.Long` | `129` | `long` |
| `QMetaType.LongLong` | `4` | 的LongLong |
| `QMetaType.Short` | `130` | `short` |
| `QMetaType.Char` | `131` | `char` |
| `QMetaType.ULong` | `132` | `unsigned long` |
| `QMetaType.ULongLong` | `5` | ULONGLONG |
| `QMetaType.UShort` | `133` | `unsigned short` |
| `QMetaType.UChar` | `134` | `unsigned char` |
| `QMetaType.Float` | `135` | `float` |
| `QMetaType.QObjectStar` | `136` | [QObject](qobject.html)* |
| `QMetaType.QWidgetStar` | `137` | [QWidget](qwidget.html)* |
| `QMetaType.QVariant` | `138` | 的QVariant |
| `QMetaType.QColorGroup` | `63` | QColorGroup |
| `QMetaType.QCursor` | `74` | QCursor |
| `QMetaType.QDate` | `14` | 的QDate |
| `QMetaType.QSize` | `21` | QSIZE |
| `QMetaType.QTime` | `15` | QTIME |
| `QMetaType.QVariantList` | `9` | QVariantList |
| `QMetaType.QPolygon` | `71` | QPolygon |
| `QMetaType.QColor` | `67` | 而QColor |
| `QMetaType.QSizeF` | `22` | QSizeF |
| `QMetaType.QRectF` | `20` | QRectF |
| `QMetaType.QLine` | `23` | QLine |
| `QMetaType.QTextLength` | `78` | QTextLength |
| `QMetaType.QStringList` | `11` | QStringList中 |
| `QMetaType.QVariantMap` | `8` | QVariantMap |
| `QMetaType.QVariantHash` | `28` | QVariantHash |
| `QMetaType.QIcon` | `69` | QIcon則 |
| `QMetaType.QPen` | `77` | QPen |
| `QMetaType.QLineF` | `24` | QLineF |
| `QMetaType.QTextFormat` | `79` | QTextFormat |
| `QMetaType.QRect` | `19` | 查閱QRect |
| `QMetaType.QPoint` | `25` | QPoint |
| `QMetaType.QUrl` | `17` | QUrl |
| `QMetaType.QRegExp` | `27` | QRegExp |
| `QMetaType.QDateTime` | `16` | QDateTime |
| `QMetaType.QPointF` | `26` | QPointF |
| `QMetaType.QPalette` | `68` | QPalette |
| `QMetaType.QFont` | `64` | QFont |
| `QMetaType.QBrush` | `66` | QBrush |
| `QMetaType.QRegion` | `72` | QRegion |
| `QMetaType.QBitArray` | `13` | QBitArray |
| `QMetaType.QImage` | `70` | QImage的 |
| `QMetaType.QKeySequence` | `76` | QKeySequence |
| `QMetaType.QSizePolicy` | `75` | QSizePolicy |
| `QMetaType.QPixmap` | `65` | 的QPixmap |
| `QMetaType.QLocale` | `18` | QLocale |
| `QMetaType.QBitmap` | `73` | QBitmap |
| `QMetaType.QMatrix` | `80` | 系列QMatrix |
| `QMetaType.QTransform` | `81` | QTransform |
| `QMetaType.QMatrix4x4` | `82` | QMatrix4x4 |
| `QMetaType.QVector2D` | `83` | QVector2D |
| `QMetaType.QVector3D` | `84` | QVector3D |
| `QMetaType.QVector4D` | `85` | QVector4D |
| `QMetaType.QQuaternion` | `86` | QQuaternion |
| `QMetaType.QEasingCurve` | `29` | QEasingCurve |
| `QMetaType.User` | `256` | 用戶類型基值 |
其他類型的可使用注冊[Q_DECLARE_METATYPE](qmetatype.html#Q_DECLARE_METATYPE)（ ） 。
**See also** [type](qmetatype.html#type)（）和[typeName](qmetatype.html#typeName)（ ） 。
* * *
## Method Documentation
```
QMetaType.__init__ (self)
```
```
QMetaType.__init__ (self, QMetaType)
```
```
bool QMetaType.isRegistered (int?type)
```
返回True如果一個ID的數據類型_type_注冊，否則返回False 。
**See also** [type](qmetatype.html#type)（ ）[typeName](qmetatype.html#typeName)（）和[Type](qmetatype.html#Type-enum)。
```
int QMetaType.type (str?typeName)
```
返回的句柄調用類型_typeName_或0，如果不存在這樣的類型。
**See also** [isRegistered](qmetatype.html#isRegistered)（ ）[typeName](qmetatype.html#typeName)（）和[Type](qmetatype.html#Type-enum)。
```
str QMetaType.typeName (int?type)
```
返回與給定關聯的類型名稱_type_，或者0 ，如果沒有匹配的類型被發現。返回的指針不能被刪除。
**See also** [type](qmetatype.html#type)（ ）[isRegistered](qmetatype.html#isRegistered)（）和[Type](qmetatype.html#Type-enum)。
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- 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