# QImageWriter Class Reference
## [[QtGui](index.htm) module]
该QImageWriter类提供用于编写图像文件或其它设备的格式无关的接口。[More...](#details)
### Types
* `enum ImageWriterError { UnknownError, DeviceError, UnsupportedFormatError }`
### Methods
* `__init__ (self)`
* `__init__ (self, QIODevice device, QByteArray format)`
* `__init__ (self, QString fileName, QByteArray format = QByteArray())`
* `bool canWrite (self)`
* `int compression (self)`
* `QString description (self)`
* `QIODevice device (self)`
* `ImageWriterError error (self)`
* `QString errorString (self)`
* `QString fileName (self)`
* `QByteArray format (self)`
* `float gamma (self)`
* `int quality (self)`
* `setCompression (self, int compression)`
* `setDescription (self, QString description)`
* `setDevice (self, QIODevice device)`
* `setFileName (self, QString fileName)`
* `setFormat (self, QByteArray format)`
* `setGamma (self, float gamma)`
* `setQuality (self, int quality)`
* `setText (self, QString key, QString text)`
* `bool supportsOption (self, QImageIOHandler.ImageOption option)`
* `bool write (self, QImage image)`
### Static Methods
* `list-of-QByteArray supportedImageFormats ()`
* * *
## Detailed Description
该QImageWriter类提供用于编写图像文件或其它设备的格式无关的接口。
QImageWriter支持设置格式特定的选项,如Gamma值,压缩水平和质量,在存储图像前。如果你不需要这样的选项,您可以使用[QImage.save](qimage.html#save)()或[QPixmap.save](qpixmap.html#save)( )来代替。
要存储的图像,你通过构建一个QImageWriter对象开始。通过其中一个文件名或设备指针,图像格式QImageWriter的构造函数。然后,您可以设置多个选项,如伽玛值(通过调用[setGamma](qimagewriter.html#setGamma)( ) )和质量(通过调用[setQuality](qimagewriter.html#setQuality)())。[canWrite](qimagewriter.html#canWrite)( )返回True ,如果QImageWriter可写的图像(即图像格式的支持和设备是开放的写作) 。通话[write](qimagewriter.html#write)( )将图像写入到设备。
如果写入图像时出现任何错误,[write](qimagewriter.html#write)( )将返回False 。然后,您可以调用[error](qimagewriter.html#error)()找到所发生的错误的类型,或者[errorString](qimagewriter.html#errorString)()来得到一个什么地方出了错人类可读的描述。
Call [supportedImageFormats](qimagewriter.html#supportedImageFormats)( )对于格式QImageWriter可以写一个清单。 QImageWriter支持所有内置的图像格式,除了支持写入任何图像格式的插件。
* * *
## Type Documentation
```
QImageWriter.ImageWriterError
```
这个枚举变量描述了编写图像时可能发生的错误[QImageWriter](qimagewriter.html)。
| Constant | Value | Description |
| --- | --- | --- |
| `QImageWriter.DeviceError` | `1` | [QImageWriter](qimagewriter.html)写入图像数据时遇到的一个装置的错误。请谘询您的设备上出了什么问题的更多细节。 |
| `QImageWriter.UnsupportedFormatError` | `2` | Qt不支持所请求的图像的格式。 |
| `QImageWriter.UnknownError` | `0` | 发生未知错误。如果在调用后得到这个值[write](qimagewriter.html#write)( ) ,它是最有可能的一个错误引起的[QImageWriter](qimagewriter.html)。 |
* * *
## Method Documentation
```
QImageWriter.__init__ (self)
```
构造一个空[QImageWriter](qimagewriter.html)对象。写作之前,你必须调用[setFormat](qimagewriter.html#setFormat)()来设置图像格式,然后[setDevice](qimagewriter.html#setDevice)()或[setFileName](qimagewriter.html#setFileName)( ) 。
```
QImageWriter.__init__ (self, QIODevice device, QByteArray format)
```
构造一个[QImageWriter](qimagewriter.html)使用该设备对象_device_和图像格式_format_。
```
QImageWriter.__init__ (self, QString fileName, QByteArray format = QByteArray())
```
构造一个[QImageWriter](qimagewriter.html)这将写入一个文件名为对象_fileName_使用的图像格式_format_。如果_format_不设置,[QImageWriter](qimagewriter.html)将检测到的图像格式通过检查的延伸_fileName_。
```
bool QImageWriter.canWrite (self)
```
返回True如果[QImageWriter](qimagewriter.html)可以写的图像,也就是说,图像格式的支持以及分配的装置打开阅读。
**See also** [write](qimagewriter.html#write)( )[setDevice](qimagewriter.html#setDevice)()和[setFormat](qimagewriter.html#setFormat)( ) 。
```
int QImageWriter.compression (self)
```
返回图像的压缩。
**See also** [setCompression](qimagewriter.html#setCompression)( ) 。
```
QString QImageWriter.description (self)
```
```
QIODevice QImageWriter.device (self)
```
[](qiodevice.html)
[返回当前分配给设备](qiodevice.html)[QImageWriter](qimagewriter.html),或者0,如果没有设备已经被分配。
**See also** [setDevice](qimagewriter.html#setDevice)( ) 。
```
ImageWriterError QImageWriter.error (self)
```
[
返回上次发生错误的类型。
](qimagewriter.html#ImageWriterError-enum)
[**See also**](qimagewriter.html#ImageWriterError-enum) [ImageWriterError](qimagewriter.html#ImageWriterError-enum)和[errorString](qimagewriter.html#errorString)( ) 。
```
QString QImageWriter.errorString (self)
```
返回上次发生错误的可读描述。
**See also** [error](qimagewriter.html#error)( ) 。
```
QString QImageWriter.fileName (self)
```
如果当前分配装置是[QFile](qfile.html),或者如果[setFileName](qimagewriter.html#setFileName)( )被调用,此函数返回文件的名称[QImageWriter](qimagewriter.html)写入。否则(即,如果没有设备已被分配或设备不是[QFile](qfile.html)) ,空[QString](qstring.html)返回。
**See also** [setFileName](qimagewriter.html#setFileName)()和[setDevice](qimagewriter.html#setDevice)( ) 。
```
QByteArray QImageWriter.format (self)
```
[](qbytearray.html)
[返回格式](qbytearray.html)[QImageWriter](qimagewriter.html)用来书写的图像。
**See also** [setFormat](qimagewriter.html#setFormat)( ) 。
```
float QImageWriter.gamma (self)
```
返回图像的灰度级。
**See also** [setGamma](qimagewriter.html#setGamma)( ) 。
```
int QImageWriter.quality (self)
```
返回的图像的质量级别。
**See also** [setQuality](qimagewriter.html#setQuality)( ) 。
```
QImageWriter.setCompression (self, int compression)
```
这是设置一个图像的压缩图像格式的具体功能。对于不支持设置压缩图像格式,该值将被忽略。
的取值范围_compression_取决于图像格式。例如, “ TIFF ”格式支持两个值, 0 (不压缩)和1( LZW压缩) 。
**See also** [compression](qimagewriter.html#compression)( ) 。
```
QImageWriter.setDescription (self, QString description)
```
```
QImageWriter.setDevice (self, QIODevice device)
```
Sets [QImageWriter](qimagewriter.html)的设备_device_。如果设备已经被设置,旧设备是从除去[QImageWriter](qimagewriter.html)而在其他情况保持不变。
如果该设备尚未打开,[QImageWriter](qimagewriter.html)将尝试在打开设备[QIODevice.WriteOnly](qiodevice.html#OpenModeFlag-enum)模式通过调用open ( ) 。注意,这并不对某些设备,如工作[QProcess](qprocess.html),[QTcpSocket](qtcpsocket.html)和[QUdpSocket](qudpsocket.html),其中更多的逻辑需要打开设备。
**See also** [device](qimagewriter.html#device)()和[setFileName](qimagewriter.html#setFileName)( ) 。
```
QImageWriter.setFileName (self, QString fileName)
```
设置的文件名[QImageWriter](qimagewriter.html)至_fileName_。在内部,[QImageWriter](qimagewriter.html)将创建一个[QFile](qfile.html)并在打开它[QIODevice.WriteOnly](qiodevice.html#OpenModeFlag-enum)模式,并写入图像时使用这个文件。
**See also** [fileName](qimagewriter.html#fileName)()和[setDevice](qimagewriter.html#setDevice)( ) 。
```
QImageWriter.setFormat (self, QByteArray format)
```
设置格式[QImageWriter](qimagewriter.html)写图像时,要会用_format_。_format_是不区分大小写的文本字符串。例如:
```
[QImageWriter](qimagewriter.html) writer;
writer.setFormat("png"); // same as writer.setFormat("PNG");
```
您可以致电[supportedImageFormats](qimagewriter.html#supportedImageFormats)( )对于格式的完整列表[QImageWriter](qimagewriter.html)支持。
**See also** [format](qimagewriter.html#format)( ) 。
```
QImageWriter.setGamma (self, float gamma)
```
这是一种图像格式的具体功能,用于设置图像的伽马电平到_gamma_。对于不支持设置的Gamma值的图像格式,该值将被忽略。
的取值范围_gamma_取决于图像格式。例如, “ PNG ”格式支持一个伽玛范围从0.0到1.0。
**See also** [gamma](qimagewriter.html#gamma)()和[quality](qimagewriter.html#quality)( ) 。
```
QImageWriter.setQuality (self, int quality)
```
这是一种图像格式的具体功能,用于设置图像的质量水平来_quality_。对于不支持设置质量的图像格式,该值将被忽略。
的取值范围_quality_取决于图像格式。例如, “JPEG”格式支持的质量范围从0(低品质,高压缩)到100 (高品质,低压缩率) 。
**See also** [quality](qimagewriter.html#quality)( ) 。
```
QImageWriter.setText (self, QString key, QString text)
```
设置与该键关联图像的文字_key_至_text_。这是用于存储版权信息或图像等信息是有用的。例如:
```
[QImage](qimage.html) image("some/image.jpeg");
[QImageWriter](qimagewriter.html) writer("../img/outimage.png", "png");
writer.setText("Author", "John Smith");
writer.write(image);
```
如果你想存储数据的一个单一的块(例如,注释) ,你可以传递一个空键,或使用如“描述”一个通用密钥。
键和文本将被嵌入到图像数据后调用[write](qimagewriter.html#write)( ) 。
支持这个选项是通过实施[QImageIOHandler.Description](qimageiohandler.html#ImageOption-enum)。
这个函数是Qt 4.1中引入。
**See also** [QImage.setText](qimage.html#setText)()和[QImageReader.text](qimagereader.html#text)( ) 。
```
list-of-QByteArray QImageWriter.supportedImageFormats ()
```
传回的图像格式所支持的列表[QImageWriter](qimagewriter.html)。
默认情况下, Qt可以编写以下格式:
| Format | Description |
| --- | --- |
| BMP | Windows Bitmap |
| JPG | Joint Photographic Experts Group |
| JPEG | Joint Photographic Experts Group |
| PNG | Portable Network Graphics |
| PPM | Portable Pixmap |
| TIFF | Tagged Image File Format |
| XBM | X11 Bitmap |
| XPM | X11 Pixmap |
读取和写入SVG文件是通过Qt的支持[SVG Module](index.htm)。
注意,这个[QApplication](qapplication.html)实例必须调用此函数之前创建。
**See also** [setFormat](qimagewriter.html#setFormat)( )[QImageReader.supportedImageFormats](qimagereader.html#supportedImageFormats)()和[QImageIOPlugin](index.htm)。
```
bool QImageWriter.supportsOption (self, QImageIOHandler.ImageOption option)
```
返回True如果writer支持_option_否则返回False 。
不同的图像格式支持不同的选项。调用此函数来判断某个选项是否支持当前格式。例如, PNG格式允许你嵌入文本到图像的元数据(见正文( ) ) 。
```
[QImageWriter](qimagewriter.html) writer(fileName);
if (writer.supportsOption([QImageIOHandler](qimageiohandler.html).Description))
writer.setText("Author", "John Smith");
```
之后笔者已经与格式相关的选项可以进行测试。
这个函数中引入了Qt 4.2中。
**See also** [QImageReader.supportsOption](qimagereader.html#supportsOption)()和[setFormat](qimagewriter.html#setFormat)( ) 。
```
bool QImageWriter.write (self, QImage image)
```
写入图像_image_到指定的设备或文件名。成功时返回TRUE ,否则返回False 。如果操作失败,您可以拨打[error](qimagewriter.html#error)()找到所发生的错误的类型,或者[errorString](qimagewriter.html#errorString)( )来获得错误的可读描述。
**See also** [canWrite](qimagewriter.html#canWrite)( )[error](qimagewriter.html#error)()和[errorString](qimagewriter.html#errorString)( ) 。
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- 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