# QImageIOHandler Class Reference
## [[QtGui](index.htm) module]
该QImageIOHandler类定义Qt中的所有图像格式的图像常见的I / O接口。[More...](#details)
### Types
* `enum ImageOption { Size, ClipRect, Description, ScaledClipRect, ..., BackgroundColor }`
### Methods
* `__init__ (self)`
* `bool canRead (self)`
* `int currentImageNumber (self)`
* `QRect currentImageRect (self)`
* `QIODevice device (self)`
* `QByteArray format (self)`
* `int imageCount (self)`
* `bool jumpToImage (self, int imageNumber)`
* `bool jumpToNextImage (self)`
* `int loopCount (self)`
* `QByteArray name (self)`
* `int nextImageDelay (self)`
* `QVariant option (self, ImageOption option)`
* `bool read (self, QImage image)`
* `setDevice (self, QIODevice device)`
* `setFormat (self, QByteArray format)`
* `setOption (self, ImageOption option, QVariant value)`
* `bool supportsOption (self, ImageOption option)`
* `bool write (self, QImage image)`
* * *
## Detailed Description
该QImageIOHandler类定义Qt中的所有图像格式的图像常见的I / O接口。
Qt使用QImageIOHandler通过读取和写入图像[QImageReader](qimagereader.html)和[QImageWriter](qimagewriter.html)。您也可以从这个类派生使用Qt的插件机制来编写自己的图像格式处理程序。
Call [setDevice](qimageiohandler.html#setDevice)( )到设备分配给处理程序,[setFormat](qimageiohandler.html#setFormat)( )的形式分配给它。一QImageIOHandler可以支持一个以上的图像格式。[canRead](qimageiohandler.html#canRead)()返回True,如果一个图像可以从设备读取,并[read](qimageiohandler.html#read)()和[write](qimageiohandler.html#write)( )返回True,如果读取或写入图像已成功完成。
QImageIOHandler也有动画格式的支持,通过功能[loopCount](qimageiohandler.html#loopCount)( )[imageCount](qimageiohandler.html#imageCount)( )[nextImageDelay](qimageiohandler.html#nextImageDelay)()和[currentImageNumber](qimageiohandler.html#currentImageNumber)( ) 。
为了确定哪些选项的图像处理程序支持, Qt会调用[supportsOption](qimageiohandler.html#supportsOption)()和[setOption](qimageiohandler.html#setOption)( ) 。请务必重新实现这些功能,如果你能提供任何在该选项的支持[ImageOption](qimageiohandler.html#ImageOption-enum)枚举。
写你自己的图像处理程序,您必须至少重新实现[canRead](qimageiohandler.html#canRead)()和[read](qimageiohandler.html#read)( ) 。然后创建一个[QImageIOPlugin](index.htm)它可以创建的处理程序。最后,安装插件,[QImageReader](qimagereader.html)和[QImageWriter](qimagewriter.html)将自动加载该插件,并开始使用它。
* * *
## Type Documentation
```
QImageIOHandler.ImageOption
```
这个枚举变量描述了所支持的不同选择[QImageIOHandler](qimageiohandler.html)。有些选项是用来查询的图像的性质,有些则是用来切换中的图像应该写入的方式。
| Constant | Value | Description |
| --- | --- | --- |
| `QImageIOHandler.Size` | `0` | 图像的原始尺寸。支持此选项的处理程序,预计从图像元数据读取的图像的大小,并从返回此尺寸[option](qimageiohandler.html#option)( ),为[QSize](qsize.html)。 |
| `QImageIOHandler.ClipRect` | `1` | 剪辑矩形,或ROI (感兴趣区域) 。支持此选项的处理程序,预计只能读取提供[QRect](qrect.html)从原始图像区域[read](qimageiohandler.html#read)( ) ,任何其他应用转换之前。 |
| `QImageIOHandler.ScaledSize` | `4` | 图像的缩放大小。支持此选项的处理程序,预计将图像缩放到所提供的尺寸([QSize](qsize.html)) ,应用任何剪辑矩形变换( ClipRect )之后。如果处理程序不支持此选项,[QImageReader](qimagereader.html)将执行缩放图像已被读取。 |
| `QImageIOHandler.ScaledClipRect` | `3` | 缩放剪辑矩形的图像(或ROI ,感兴趣区域) 。支持此选项的处理程序,预计申请所提供的剪辑矩形(一[QRect](qrect.html)) ,应用任何缩放( ScaleSize )或定期修剪( ClipRect )之后。如果处理程序不支持此选项,[QImageReader](qimagereader.html)将应用缩放剪辑矩形图像已被读取。 |
| `QImageIOHandler.Description` | `2` | 形象的描述。一些图像格式,如GIF和PNG ,可以使文字或意见嵌入到图像数据(例如,用于存储版权信息) 。这是常见的文本存储在键 - 值对的,但一些格式存储所有的文字在一个连续的块。[QImageIOHandler](qimageiohandler.html)返回文本为一体[QString](qstring.html),其中键和值由分隔':'和键 - 值对是由两个换行符( \ n \ n已)分隔。例如, “标题:日落\ N \ nAuthor :吉姆·史密斯\ nSarah琼斯\ n \ n已” 。存储文本在一个单一的块格式可以使用“描述”为重点。 |
| `QImageIOHandler.CompressionRatio` | `5` | 的图像数据的压缩比。支持此选项的处理程序,预计在写入时设置取决于此选项的值它的压缩率( int类型) 。 |
| `QImageIOHandler.Gamma` | `6` | 图像的灰度级。支持此选项的处理程序,预计在写入时设置取决于此选项的值图像Gamma值(浮点数) 。 |
| `QImageIOHandler.Quality` | `7` | 的图像的质量级别。支持此选项的处理程序,预计写入时设置图像质量水平取决于该选项的值(一个int ) 。 |
| `QImageIOHandler.Name` | `8` | 该图像的名称。支持此选项的处理程序,预计从图像元数据读取的名称,并返回此作为[QString](qstring.html)或写入预期要存储在图像的元数据的名称的图像时。 |
| `QImageIOHandler.SubType` | `9` | 图像的子类型。支持此选项的处理程序可以使用子类型值,以帮助阅读和写作的图像时。例如, PPM处理程序可以具有“ PPM ”或“ ppmraw ”的子类型的值。 |
| `QImageIOHandler.IncrementalReading` | `10` | 支持此选项的处理程序,预计读取图像中的几次传球,就好像它是一个动画。[QImageReader](qimagereader.html)将把图像作为动画。 |
| `QImageIOHandler.Endianness` | `11` | 图像的字节序。某些图像格式可以存储为大尾端或LittleEndian 。支持字节序的处理程序使用此选项的值,以确定如何在图像的存储位置。 |
| `QImageIOHandler.Animation` | `12` | 支持动画返回True此值图像格式[supportsOption](qimageiohandler.html#supportsOption)( ),否则,则返回False。 |
| `QImageIOHandler.BackgroundColor` | `13` | 某些图像格式允许指定背景颜色。支持BACKGROUNDCOLOR处理程序初始化背景色为这个选项(一[QColor](qcolor.html))读取图像时。 |
| `QImageIOHandler.ImageFormat` | `14` | 由处理图像的数据格式返回。这可以是任意的中列出的格式[QImage.Format](qimage.html#Format-enum)。 |
* * *
## Method Documentation
```
QImageIOHandler.__init__ (self)
```
构造一个[QImageIOHandler](qimageiohandler.html)对象。
```
bool QImageIOHandler.canRead (self)
```
这种方法是抽象的,应在任何子类中重新实现。
返回True如果图像可以从设备读取(即图像格式的支持,该设备可以读取和初始头信息表明,图像可以被读取),否则返回False 。
当重新实现的CanRead ( ) ,请确保I / O设备([device](qimageiohandler.html#device)())被留在其原来的状态(例如,通过使用PEEK( ),而不是[read](qimageiohandler.html#read)())。
**See also** [read](qimageiohandler.html#read)()和[QIODevice.peek](qiodevice.html#peek)( ) 。
```
int QImageIOHandler.currentImageNumber (self)
```
对于支持动画图像格式,该函数返回当前图像的动画序列号。如果这个函数被调用任何图像之前[read](qimageiohandler.html#read)( ) ,则返回-1。序列中的第一图像的数目是0。
如果图像格式不支持动画,则返回0 。
**See also** [read](qimageiohandler.html#read)( ) 。
```
QRect QImageIOHandler.currentImageRect (self)
```
[
返回当前图像的正确。如果没有RECT定义为图像,以及空查阅QRect ( )返回。
这个功能对于动画,其中帧的唯一部件可以在同一时间进行更新是有用的。
](qrect.html)
```
QIODevice QImageIOHandler.device (self)
```
[](qiodevice.html)
[返回当前分配给该设备](qiodevice.html)[QImageIOHandler](qimageiohandler.html)。如果没有设备已经被分配,则返回0 。
**See also** [setDevice](qimageiohandler.html#setDevice)( ) 。
```
QByteArray QImageIOHandler.format (self)
```
[](qbytearray.html)
[返回当前分配到的格式](qbytearray.html)[QImageIOHandler](qimageiohandler.html)。如果没有指定格式已被分配,则返回一个空字符串。
**See also** [setFormat](qimageiohandler.html#setFormat)( ) 。
```
int QImageIOHandler.imageCount (self)
```
对于支持动画图像格式,该函数返回的动画图像的数量。如果图像格式不支持动画,或者如果它是无法确定的图像的数量,则返回0 。
默认实现返回1 ,如果[canRead](qimageiohandler.html#canRead)( )返回True,否则返回0。
```
bool QImageIOHandler.jumpToImage (self, int imageNumber)
```
对于支持动画图像格式,该函数跳转到的序列号是图像_imageNumber_。到下一次调用[read](qimageiohandler.html#read)( )将尝试读取这个形象。
默认实现不执行任何操作,并返回False 。
```
bool QImageIOHandler.jumpToNextImage (self)
```
对于支持动画图像格式,该功能跳转到下一个图像。
默认实现不执行任何操作,并返回False 。
```
int QImageIOHandler.loopCount (self)
```
对于支持动画图像格式,该函数返回的时候动画应该循环的次数。如果图像格式不支持动画,则返回0 。
```
QByteArray QImageIOHandler.name (self)
```
[
```
int QImageIOHandler.nextImageDelay (self)
```
对于支持动画图像格式,该函数返回的毫秒数要等到读取下一个图像。如果图像格式不支持动画,则返回0 。
```
QVariant QImageIOHandler.option (self, ImageOption option)
```
](qbytearray.html)
[返回指定的值_option_作为](qbytearray.html)[QVariant](qvariant.html)。值的类型取决于选项。例如,选项(尺寸)返回一个[QSize](qsize.html)变体。
**See also** [setOption](qimageiohandler.html#setOption)()和[supportsOption](qimageiohandler.html#supportsOption)( ) 。
```
bool QImageIOHandler.read (self, QImage image)
```
这种方法是抽象的,应在任何子类中重新实现。
从设备中读取的图像,并将其存储在_image_。返回True如果图像被成功读取,否则返回False 。
对于支持增量加载的图像格式,并为动画格式,图像处理程序可以假设_image_指向前一帧。
**See also** [canRead](qimageiohandler.html#canRead)( ) 。
```
QImageIOHandler.setDevice (self, QIODevice device)
```
设置的设备[QImageIOHandler](qimageiohandler.html)至_device_。读取和写入图像时的图像处理程序将使用该设备。
该设备只能设置一次,并调用之前必须设置[canRead](qimageiohandler.html#canRead)( )[read](qimageiohandler.html#read)( )[write](qimageiohandler.html#write)( )等,如果你需要读取多个文件,建立相应的多个实例[QImageIOHandler](qimageiohandler.html)子类。
**See also** [device](qimageiohandler.html#device)( ) 。
```
QImageIOHandler.setFormat (self, QByteArray format)
```
设置的格式[QImageIOHandler](qimageiohandler.html)至_format_。该格式是支持多种格式的图像处理程序非常有用。
**See also** [format](qimageiohandler.html#format)( ) 。
```
QImageIOHandler.setOption (self, ImageOption option, QVariant value)
```
设置选项_option_与该值_value_。
**See also** [option](qimageiohandler.html#option)()和[ImageOption](qimageiohandler.html#ImageOption-enum)。
```
bool QImageIOHandler.supportsOption (self, ImageOption option)
```
返回True如果[QImageIOHandler](qimageiohandler.html)支持选项_option_否则返回False 。例如,如果[QImageIOHandler](qimageiohandler.html)支持[Size](qimageiohandler.html#ImageOption-enum)选项, supportsOption (尺寸)必须返回True 。
**See also** [setOption](qimageiohandler.html#setOption)()和[option](qimageiohandler.html#option)( ) 。
```
bool QImageIOHandler.write (self, QImage image)
```
写入图像_image_到所分配的设备。成功时返回TRUE ,否则返回False 。
默认实现不执行任何操作,并简单地返回False 。
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- QPicture Class Reference
- QPictureIO Class Reference
- QPinchGesture Class Reference
- QPixmap Class Reference
- QPixmapCache Class Reference
- QPlainTextDocumentLayout Class Reference
- QPlainTextEdit Class Reference
- QPluginLoader Class Reference
- QPoint Class Reference
- QPointF Class Reference
- QPolygon Class Reference
- QPolygonF Class Reference
- QPrintDialog Class Reference
- QPrintEngine Class Reference
- QPrinter Class Reference
- QPrinterInfo Class Reference
- QPrintPreviewDialog Class Reference
- QPrintPreviewWidget Class Reference
- QProcess Class Reference
- QProcessEnvironment Class Reference
- QProgressBar Class Reference
- QProgressDialog Class Reference
- QPropertyAnimation Class Reference
- QProxyModel Class Reference
- QPushButton Class Reference
- QPyDeclarativePropertyValueSource Class Reference
- QPyDesignerContainerExtension Class Reference
- QPyDesignerCustomWidgetCollectionPlugin Class Reference
- QPyDesignerCustomWidgetPlugin Class Reference
- QPyDesignerMemberSheetExtension Class Reference
- QPyDesignerPropertySheetExtension Class Reference
- QPyDesignerTaskMenuExtension Class Reference
- QPyNullVariant Class Reference
- QPyTextObject Class Reference
- QQuaternion Class Reference
- QRadialGradient Class Reference
- QRadioButton Class Reference
- QRawFont Class Reference
- QReadLocker Class Reference
- QReadWriteLock Class Reference
- QRect Class Reference
- QRectF Class Reference
- QRegExp Class Reference
- QRegExpValidator Class Reference
- QRegion Class Reference
- 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