QTextDocumentWriter 类

QTextDocumentWriter 类提供格式无关接口，用于写入 QTextDocument 到文件或其它设备。更多...

头：	#include <QTextDocumentWriter>
qmake:	QT += gui
Since:	Qt 4.5

该类在 Qt 4.5 引入。

所有成员列表，包括继承成员

公共函数

	QTextDocumentWriter (const QString & fileName , const QByteArray & format = QByteArray())
	QTextDocumentWriter (QIODevice * device , const QByteArray & format )
	QTextDocumentWriter ()
	~QTextDocumentWriter ()
QTextCodec *	codec () const
QIODevice *	device () const
QString	fileName () const
QByteArray	format () const
void	setCodec (QTextCodec * codec )
void	setDevice (QIODevice * device )
void	setFileName (const QString & fileName )
void	setFormat (const QByteArray & format )
bool	write (const QTextDocument * document )
bool	write (const QTextDocumentFragment & fragment )

静态公共成员

QList<QByteArray>

supportedDocumentFormats ()

详细描述

To write a document, construct a QTextDocumentWriter object with either a file name or a device object, and specify the document format to be written. You can construct a writer and set the format using setFormat () later.

调用 write () to write the document to the device. If the document is successfully written, this function returns true . However, if an error occurs when writing the document, it will return false.

调用 supportedDocumentFormats () for a list of formats that QTextDocumentWriter can write.

Since the capabilities of the supported output formats vary considerably, the writer simply outputs the appropriate subset of objects for each format. This typically includes the formatted text and images contained in a document.

成员函数文档编制

QTextDocumentWriter:: QTextDocumentWriter (const QString & fileName , const QByteArray & format = QByteArray())

Constructs an QTextDocumentWriter object that will write to a file with the name fileName , using the document format specified by format 。若 format is not provided, QTextDocumentWriter will detect the document format by inspecting the extension of fileName .

QTextDocumentWriter:: QTextDocumentWriter ( QIODevice * device , const QByteArray & format )

Constructs a QTextDocumentWriter object to write to the given device in the document format specified by format .

QTextDocumentWriter:: QTextDocumentWriter ()

Constructs an empty QTextDocumentWriter object. Before writing, you must call setFormat () to set a document format, then setDevice () 或 setFileName ().

QTextDocumentWriter:: ~QTextDocumentWriter ()

销毁 QTextDocumentWriter 对象。

QTextCodec *QTextDocumentWriter:: codec () const

Returns the codec that is currently assigned to the writer.

另请参阅 setCodec ().

QIODevice *QTextDocumentWriter:: device () const

Returns the device currently assigned, or nullptr 若没有设备被赋值。

另请参阅 setDevice ().

QString QTextDocumentWriter:: fileName () const

若目前赋值设备是 QFile ，或者若 setFileName () has been called, this function returns the name of the file to be written to. In all other cases, it returns an empty string.

另请参阅 setFileName () 和 setDevice ().

QByteArray QTextDocumentWriter:: format () const

返回用于写文档的格式。

另请参阅 setFormat ().

void QTextDocumentWriter:: setCodec ( QTextCodec * codec )

Sets the codec for this stream to codec . The codec is used for encoding any data that is written. By default, QTextDocumentWriter uses UTF-8.

另请参阅 codec ().

void QTextDocumentWriter:: setDevice ( QIODevice * device )

Sets the writer's device to the device specified. If a device has already been set, the old device is removed but otherwise left unchanged.

若设备尚未打开， QTextDocumentWriter will attempt to open the device in QIODevice::WriteOnly mode by calling open().

注意： This will not work for certain devices, such as QProcess , QTcpSocket and QUdpSocket , where some configuration is required before the device can be opened.

另请参阅 device () 和 setFileName ().

void QTextDocumentWriter:: setFileName (const QString & fileName )

Sets the name of the file to be written to fileName . Internally, QTextDocumentWriter 将创建 QFile and open it in QIODevice::WriteOnly mode, and use this file when writing the document.

另请参阅 fileName () 和 setDevice ().

void QTextDocumentWriter:: setFormat (const QByteArray & format )

Sets the format used to write documents to the format 指定。 format is a case insensitive text string. For example:

        QTextDocumentWriter writer;
        writer.setFormat("odf"); // same as writer.setFormat("ODF");

可以调用 supportedDocumentFormats () 了解完整格式列表 QTextDocumentWriter 支持。

另请参阅 format ().

`[static]` QList < QByteArray > QTextDocumentWriter:: supportedDocumentFormats ()

返回文档格式列表支持通过 QTextDocumentWriter .

默认情况下，Qt 可以写入下列格式：

格式	描述
plaintext	纯文本
HTML	HTML (超文本标记语言)
markdown	Markdown (CommonMark 或 GitHub 方言)
ODF	ODF (开放文档格式)