# QBuffer Class Reference
## [[QtCore](index.htm) module]
该Q缓冲器类提供了一个[QIODevice](qiodevice.html)接口为一[QByteArray](qbytearray.html)。[More...](#details)
继承[QIODevice](qiodevice.html)。
### Methods
* `__init__ (self, QObject parent = None)`
* `__init__ (self, QByteArray byteArray, QObject parent = None)`
* `bool atEnd (self)`
* `QByteArray buffer (self)`
* `bool canReadLine (self)`
* `close (self)`
* `connectNotify (self, SIGNAL())`
* `QByteArray data (self)`
* `disconnectNotify (self, SIGNAL())`
* `bool open (self, QIODevice.OpenMode openMode)`
* `int pos (self)`
* `str readData (self, int maxlen)`
* `bool seek (self, int off)`
* `setBuffer (self, QByteArray a)`
* `setData (self, QByteArray data)`
* `setData (self, str adata)`
* `int size (self)`
* `int writeData (self, str data)`
* * *
## Detailed Description
该Q缓冲器类提供了一个[QIODevice](qiodevice.html)接口为一[QByteArray](qbytearray.html)。
Q缓冲器允许你访问一个[QByteArray](qbytearray.html)使用[QIODevice](qiodevice.html)接口。该[QByteArray](qbytearray.html)被视为只是作为一个标准的随机访问的文件。例如:
```
QBuffer buffer;
char ch;
buffer.open(QBuffer.ReadWrite);
buffer.write("Qt rocks!");
buffer.seek(0);
buffer.getChar(&ch); // ch == 'Q'
buffer.getChar(&ch); // ch == 't'
buffer.getChar(&ch); // ch == ' '
buffer.getChar(&ch); // ch == 'r'
```
默认情况下,内部[QByteArray](qbytearray.html)缓冲区是为你,当你创建一个Q缓冲器创建。您可以直接通过调用访问该缓冲区[buffer](qbuffer.html#buffer)( ) 。也可以使用ΣQ缓冲与现有[QByteArray](qbytearray.html)通过调用[setBuffer](qbuffer.html#setBuffer)( ) ,或者通过你的数组Q缓冲器的构造函数。
Call [open](qbuffer.html#open)()打开缓冲区。然后调用[write](qiodevice.html#write)()或[putChar](qiodevice.html#putChar)( )写入到缓冲区,并[read](qiodevice.html#read)( )[readLine](qiodevice.html#readLine)( )[readAll](qiodevice.html#readAll)() ,或[getChar](qiodevice.html#getChar)()读取它。[size](qbuffer.html#size)()返回缓冲区的当前大小,并且可以通过调用试图在缓冲区中的任意位置[seek](qbuffer.html#seek)( ) 。当你与访问缓冲完成后,调用[close](qbuffer.html#close)( ) 。
下面的代码片段显示了如何将数据写入到[QByteArray](qbytearray.html) using [QDataStream](qdatastream.html)和Q缓冲器:
```
[QByteArray](qbytearray.html) byteArray;
QBuffer buffer(&byteArray);
buffer.open([QIODevice](qiodevice.html).WriteOnly);
[QDataStream](qdatastream.html) out(&buffer);
out << [QApplication](qapplication.html).palette();
```
实际上,我们把应用程序的[QPalette](qpalette.html)成一个字节数组。以下是如何从读取数据[QByteArray](qbytearray.html):
```
[QPalette](qpalette.html) palette;
QBuffer buffer(&byteArray);
buffer.open([QIODevice](qiodevice.html).ReadOnly);
[QDataStream](qdatastream.html) in(&buffer);
in >> palette;
```
[QTextStream](qtextstream.html)和[QDataStream](qdatastream.html)还提供了方便的构造函数,它接受一个[QByteArray](qbytearray.html)并创建一个Q缓冲器幕后。
Q缓冲器发出[readyRead](qiodevice.html#readyRead)( )当新的数据到达缓冲区。通过连接到这个信号,就可以使用Q缓冲器处理之前来存储临时数据。例如,您可以将缓冲区传递到[QFtp](qftp.html)从FTP服务器上下载一个文件时。每当一个新的数据有效载荷被下载,[readyRead](qiodevice.html#readyRead)( )被发射,并且可以处理刚到的数据。 Q缓冲器还发出[bytesWritten](qiodevice.html#bytesWritten)( )每次新的数据已经被写入到缓冲区。
* * *
## Method Documentation
```
QBuffer.__init__ (self, QObject parent = None)
```
该_parent_的说法,如果不是没有,原因_self_通过Qt的,而不是PyQt的拥有。
构造一个空的缓冲区与给定_parent_。您可以致电[setData](qbuffer.html#setData)()来填充数据的缓冲区,也可以在写入模式,并使用它打开[write](qiodevice.html#write)( ) 。
**See also** [open](qbuffer.html#open)( ) 。
```
QBuffer.__init__ (self, QByteArray byteArray, QObject parent = None)
```
该_parent_的说法,如果不是没有,原因_self_通过Qt的,而不是PyQt的拥有。
构造一个[QBuffer](qbuffer.html)使用该[QByteArray](qbytearray.html)指向_byteArray_作为其内部缓冲器,并与给定的_parent_。来电者是负责确保_byteArray_保持有效,直到[QBuffer](qbuffer.html)被破坏,或直到[setBuffer](qbuffer.html#setBuffer)( )被调用来更改缓冲区。[QBuffer](qbuffer.html)不走的所有权[QByteArray](qbytearray.html)。
如果您在只写模式打开的缓冲区或读写模式和写的东西进入[QBuffer](qbuffer.html),_byteArray_将被修改。
例如:
```
[QByteArray](qbytearray.html) byteArray("abc");
[QBuffer](qbuffer.html) buffer(&byteArray);
buffer.open([QIODevice](qiodevice.html).WriteOnly);
buffer.seek(3);
buffer.write("def", 3);
buffer.close();
// byteArray == "abcdef"
```
**See also** [open](qbuffer.html#open)( )[setBuffer](qbuffer.html#setBuffer)()和[setData](qbuffer.html#setData)( ) 。
```
bool QBuffer.atEnd (self)
```
从重新实现[QIODevice.atEnd](qiodevice.html#atEnd)( ) 。
```
QByteArray QBuffer.buffer (self)
```
[](qbytearray.html)
[返回一个引用](qbytearray.html)[QBuffer](qbuffer.html)的内部缓冲区。你可以用它来修改[QByteArray](qbytearray.html)后面的[QBuffer](qbuffer.html)的背部。
**See also** [setBuffer](qbuffer.html#setBuffer)()和[data](qbuffer.html#data)( ) 。
```
bool QBuffer.canReadLine (self)
```
从重新实现[QIODevice.canReadLine](qiodevice.html#canReadLine)( ) 。
```
QBuffer.close (self)
```
从重新实现[QIODevice.close](qiodevice.html#close)( ) 。
```
QBuffer.connectNotify (self, SIGNAL())
```
```
QByteArray QBuffer.data (self)
```
[
返回包含在缓冲区中的数据。
](qbytearray.html)
[这是相同的](qbytearray.html)[buffer](qbuffer.html#buffer)( ) 。
**See also** [setData](qbuffer.html#setData)()和[setBuffer](qbuffer.html#setBuffer)( ) 。
```
QBuffer.disconnectNotify (self, SIGNAL())
```
```
bool QBuffer.open (self, QIODevice.OpenMode openMode)
```
从重新实现[QIODevice.open](qiodevice.html#open)( ) 。
```
int QBuffer.pos (self)
```
从重新实现[QIODevice.pos](qiodevice.html#pos)( ) 。
```
str QBuffer.readData (self, int maxlen)
```
从重新实现[QIODevice.readData](qiodevice.html#readData)( ) 。
```
bool QBuffer.seek (self, int off)
```
从重新实现[QIODevice.seek](qiodevice.html#seek)( ) 。
```
QBuffer.setBuffer (self, QByteArray a)
```
品牌[QBuffer](qbuffer.html)使用[QByteArray](qbytearray.html)指向_byteArray_作为其内部缓冲器中。来电者是负责确保_byteArray_保持有效,直到[QBuffer](qbuffer.html)被破坏,或直到setBuffer ( )被调用来更改缓冲区。[QBuffer](qbuffer.html)不走的所有权[QByteArray](qbytearray.html)。
什么都不做,如果[isOpen](qiodevice.html#isOpen)()是真实的。
如果您在只写模式打开的缓冲区或读写模式和写的东西进入[QBuffer](qbuffer.html),_byteArray_将被修改。
例如:
```
[QByteArray](qbytearray.html) byteArray("abc");
[QBuffer](qbuffer.html) buffer;
buffer.setBuffer(&byteArray);
buffer.open([QIODevice](qiodevice.html).WriteOnly);
buffer.seek(3);
buffer.write("def", 3);
buffer.close();
// byteArray == "abcdef"
```
If _byteArray_为0时,缓存器创建其自己的内部[QByteArray](qbytearray.html)去努力。这个字节数组初始为空。
**See also** [buffer](qbuffer.html#buffer)( )[setData](qbuffer.html#setData)()和[open](qbuffer.html#open)( ) 。
```
QBuffer.setData (self, QByteArray data)
```
设置内部缓冲区的内容被_data_。这是相同的分配_data_至[buffer](qbuffer.html#buffer)( ) 。
什么都不做,如果[isOpen](qiodevice.html#isOpen)()是真实的。
**See also** [data](qbuffer.html#data)()和[setBuffer](qbuffer.html#setBuffer)( ) 。
```
QBuffer.setData (self, str adata)
```
这是一个重载函数。
设置内部缓冲区的内容是第一_size_字节_data_。
```
int QBuffer.size (self)
```
从重新实现[QIODevice.size](qiodevice.html#size)( ) 。
```
int QBuffer.writeData (self, str data)
```
从重新实现[QIODevice.writeData](qiodevice.html#writeData)( ) 。
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- 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