# QPictureIO Class Reference
## [[QtGui](index.htm) module]
該QPictureIO類包含用于加載和保存圖片的參數。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QIODevice?ioDevice, str?format)`
* `__init__ (self, QString?fileName, str?format)`
* `QString description (self)`
* `QString fileName (self)`
* `str format (self)`
* `float gamma (self)`
* `QIODevice ioDevice (self)`
* `str parameters (self)`
* `QPicture picture (self)`
* `int quality (self)`
* `bool read (self)`
* `setDescription (self, QString)`
* `setFileName (self, QString)`
* `setFormat (self, str)`
* `setGamma (self, float)`
* `setIODevice (self, QIODevice)`
* `setParameters (self, str)`
* `setPicture (self, QPicture)`
* `setQuality (self, int)`
* `setStatus (self, int)`
* `int status (self)`
* `bool write (self)`
### Static Methods
* `defineIOHandler (str?format, str?header, str?flags, callable?read_picture, callable?write_picture)`
* `list-of-QByteArray inputFormats ()`
* `list-of-QByteArray outputFormats ()`
* `QByteArray pictureFormat (QString?fileName)`
* `QByteArray pictureFormat (QIODevice)`
* * *
## Detailed Description
該QPictureIO類包含用于加載和保存圖片的參數。
QPictureIO包含一個[QIODevice](qiodevice.html)對象是用于圖像數據I / O。程序員可以在除了那些Qt提供了安裝新的圖片文件格式。
你通常不需要使用這個類;[QPicture.load](qpicture.html#load)( )[QPicture.save](qpicture.html#save)( ) 。
* * *
## Method Documentation
```
QPictureIO.__init__ (self)
```
構造一個[QPictureIO](qpictureio.html)對象設置為零的所有參數。
```
QPictureIO.__init__ (self, QIODevice?ioDevice, str?format)
```
構造一個[QPictureIO](qpictureio.html)與I / O設備對象_ioDevice_和_format_標記。
```
QPictureIO.__init__ (self, QString?fileName, str?format)
```
構造一個[QPictureIO](qpictureio.html)用文件名對象_fileName_和_format_標記。
```
QPictureIO.defineIOHandler (str?format, str?header, str?flags, callable?read_picture, callable?write_picture)
```
該_read_picture_參數也可能沒有。
該_write_picture_參數也可能沒有。
定義圖片的I / O處理程序稱為圖片格式_format_,其使用中所定義的正則表達式被確認_header_,讀取使用_readPicture_并采用書面_writePicture_。
_flags_是一個字符串的單字符標志這種格式。定義的唯一標志目前為T (大寫) ,所以唯一的合法值_flags_是“T”和空字符串。 “T”型標志表示該圖像文件是一個文本文件,和Qt應該把所有的換行符約定等同。 ( XPM文件和一些PPM文件是文本文件的例子。 )
_format_用于選擇處理程序寫[QPicture](qpicture.html);_header_用于選擇一個處理器來讀取一個圖像文件。
If _readPicture_是一個空指針,[QPictureIO](qpictureio.html)將無法讀取圖片中_format_。如果_writePicture_是一個空指針,[QPictureIO](qpictureio.html)將無法在寫圖片_format_。如果兩者都為null,則[QPictureIO](qpictureio.html)對象是有效的,但沒用。
例如:
```
void readSVG([QPictureIO](qpictureio.html) *picture)
{
// read the picture using the picture->ioDevice()
}
void writeSVG([QPictureIO](qpictureio.html) *picture)
{
// write the picture using the picture->ioDevice()
}
// add the SVG picture handler
// ...
```
正則表達式測試前,在文件頭全部為0字節轉換為1個字節。這樣做是因為當Qt的是基于ASCII的,[QRegExp](qregexp.html)無法處理的字符串0字節。
正則表達式只適用于前14個字節的文件。
(請注意,如果一個handlerIO支持寫入的格式,另外支持讀取它, Qt支持讀取和寫入。如果兩個處理器都支持相同的操作, Qt的選擇一個武斷。 )
```
QString QPictureIO.description (self)
```
返回圖片描述字符串。
**See also** [setDescription](qpictureio.html#setDescription)( ) 。
```
QString QPictureIO.fileName (self)
```
返回當前設置的文件名。
**See also** [setFileName](qpictureio.html#setFileName)( ) 。
```
str QPictureIO.format (self)
```
返回圖片格式的字符串或0 ,如果沒有格式已顯式設置。
**See also** [setFormat](qpictureio.html#setFormat)( ) 。
```
float QPictureIO.gamma (self)
```
返回在其照片將被視為伽瑪值。
**See also** [setGamma](qpictureio.html#setGamma)( ) 。
```
list-of-QByteArray QPictureIO.inputFormats ()
```
返回所支持的圖像輸入格式圖片排序列表。
```
QIODevice QPictureIO.ioDevice (self)
```
[
返回當前設置的IO設備。
](qiodevice.html)
[**See also**](qiodevice.html) [setIODevice](qpictureio.html#setIODevice)( ) 。
```
list-of-QByteArray QPictureIO.outputFormats ()
```
返回所支持的圖像輸出圖像格式排序列表。
```
str QPictureIO.parameters (self)
```
返回圖片的參數字符串。
**See also** [setParameters](qpictureio.html#setParameters)( ) 。
```
QPicture QPictureIO.picture (self)
```
[
返回當前設置的圖片。
](qpicture.html)
[**See also**](qpicture.html) [setPicture](qpictureio.html#setPicture)( ) 。
```
QByteArray QPictureIO.pictureFormat (QString?fileName)
```
[
返回一個字符串,該字符串指定的文件的圖片格式_fileName_,或null,如果文件不能被讀取或者格式無法識別。
](qbytearray.html)
```
QByteArray QPictureIO.pictureFormat (QIODevice)
```
[
這是一個重載函數。
返回一個字符串,它指定從IO設備讀取圖片的圖片格式_d_,或者0,如果設備無法讀取或者格式無法識別。
確保_d_是在設備(例如,在文件的開頭)的位置上。
](qbytearray.html)
[**See also**](qbytearray.html) [QIODevice.at](index.htm#at)( ) 。
```
int QPictureIO.quality (self)
```
返回寫入的圖像的質量,相關的壓縮比。
**See also** [setQuality](qpictureio.html#setQuality)()和[QPicture.save](qpicture.html#save)( ) 。
```
bool QPictureIO.read (self)
```
讀取圖片到內存中,并返回True,如果圖片是成功讀取,否則返回False 。
在閱讀的圖片,你必須設置一個IO設備或文件名。如果兩個IO設備和一個文件名被設置, IO裝置將被使用。
設置圖像文件的格式字符串是可選的。
請注意,這個函數_not_設置[format](qpictureio.html#format)用于讀取圖像。如果您需要這些信息,使用[pictureFormat](qpictureio.html#pictureFormat)( )靜態函數。
例如:
```
[QPictureIO](qpictureio.html) iio;
[QPixmap](qpixmap.html) pixmap;
iio.setFileName("vegeburger.pic");
if (iio.read()) { // OK
[QPicture](qpicture.html) picture = iio.picture();
[QPainter](qpainter.html) painter(&pixmap);
painter.drawPicture(0, 0, picture);
}
```
**See also** [setIODevice](qpictureio.html#setIODevice)( )[setFileName](qpictureio.html#setFileName)( )[setFormat](qpictureio.html#setFormat)( )[write](qpictureio.html#write)()和[QPixmap.load](qpixmap.html#load)( ) 。
```
QPictureIO.setDescription (self, QString)
```
將畫面設置描述字符串為支持圖片說明,以圖片處理程序_description_。
目前, Qt所支持無圖像格式使用的描述字符串。
**See also** [description](qpictureio.html#description)( ) 。
```
QPictureIO.setFileName (self, QString)
```
設置讀取或寫入一個圖片文件的名稱從到_fileName_。
**See also** [fileName](qpictureio.html#fileName)()和[setIODevice](qpictureio.html#setIODevice)( ) 。
```
QPictureIO.setFormat (self, str)
```
設置圖片格式_format_對圖像進行讀取或寫入。
有必要寫入一個畫面之前指定格式,但它不是必需的閱讀一個圖像之前指定的格式。
如果沒有指定格式已定, Qt的猜測圖片的格式讀取它。如果格式被設置,如果它有格式的圖片才會被讀取。
**See also** [read](qpictureio.html#read)( )[write](qpictureio.html#write)()和[format](qpictureio.html#format)( ) 。
```
QPictureIO.setGamma (self, float)
```
設置在該畫面將被視為對伽瑪值_gamma_。如果圖像格式存儲的伽馬值的量,圖像擬被使用,那么該設置將被用于修改圖像。設置為0.0將禁用gamma校正(即文件中的任何規范將被忽略) 。
默認值是0.0 。
**See also** [gamma](qpictureio.html#gamma)( ) 。
```
QPictureIO.setIODevice (self, QIODevice)
```
設置IO設備用于讀取或寫入的圖像。
設置IO設備使照片可讀取/寫入任何面向塊[QIODevice](qiodevice.html)。
If _ioDevice_不為空,這個IO設備將復蓋文件名設置。
**See also** [setFileName](qpictureio.html#setFileName)( ) 。
```
QPictureIO.setParameters (self, str)
```
圖片的參數字符串設置為_parameters_。這對于那些需要特殊參數圖片處理程序。
雖然Qt所支持當前圖片格式忽略的參數字符串,它可能會在未來的擴展或貢獻(例如, JPEG)使用。
**See also** [parameters](qpictureio.html#parameters)( ) 。
```
QPictureIO.setPicture (self, QPicture)
```
將畫面設置為_picture_。
**See also** [picture](qpictureio.html#picture)( ) 。
```
QPictureIO.setQuality (self, int)
```
設置寫入的圖像的質量_q_,相關的壓縮比。
_q_必須在范圍-1 .. 100 。指定0以獲得小的壓縮文件, 100為大型未壓縮的文件。 (-1表示默認的壓縮。 )
**See also** [quality](qpictureio.html#quality)()和[QPicture.save](qpicture.html#save)( ) 。
```
QPictureIO.setStatus (self, int)
```
將畫面設置的IO狀態_status_。一個非零值表示錯誤,而0表示IO操作是成功的。
**See also** [status](qpictureio.html#status)( ) 。
```
int QPictureIO.status (self)
```
返回圖片的IO狀態。一個非零值表示錯誤,而0表示IO操作是成功的。
**See also** [setStatus](qpictureio.html#setStatus)( ) 。
```
bool QPictureIO.write (self)
```
寫一個圖片IO設備并返回True如果圖片被成功寫入,否則返回False 。
之前寫一個圖片,你必須設置一個IO設備或文件名。如果兩個IO設備和一個文件名被設置, IO裝置將被使用。
圖片將使用指定的圖片格式寫入。
例如:
```
[QPictureIO](qpictureio.html) iio;
[QPicture](qpicture.html) picture;
[QPainter](qpainter.html) painter(&picture);
painter.drawPixmap(0, 0, pixmap);
iio.setPicture(picture);
iio.setFileName("vegeburger.pic");
iio.setFormat("PIC");
if (iio.write())
return true; // returned true if written successfully
```
**See also** [setIODevice](qpictureio.html#setIODevice)( )[setFileName](qpictureio.html#setFileName)( )[setFormat](qpictureio.html#setFormat)( )[read](qpictureio.html#read)()和[QPixmap.save](qpixmap.html#save)( ) 。
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- 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
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- QScriptClass Class Reference
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- QScrollArea Class Reference
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- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
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- QShowEvent Class Reference
- QSignalMapper Class Reference
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- QSimpleXmlNodeModel Class Reference
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- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
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- QSql Class Reference
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- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
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- Qt4.7文檔翻譯:Qt樣式單參考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
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- QStackedLayout Class Reference
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- QString Class Reference
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- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
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- QStyleOptionFrameV2 Class Reference
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- QStyleOptionGraphicsItem Class Reference
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- 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
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- QStylePainter Class Reference
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- Qt Class Reference
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- Reference
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