- Qt 6.9
- Qt GUI
- C++ Classes
- QTextDocumentWriter
- Qt 6.9.3 Reference Documentation

# QTextDocumentWriter Class

The QTextDocumentWriter class provides a format-independent interface for writing a QTextDocument to files or other devices. More...

Header: | `#include <QTextDocumentWriter>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Gui)` `target_link_libraries(mytarget PRIVATE Qt6::Gui)`
qmake: | `QT += gui`

- List of all members, including inherited members
- QTextDocumentWriter is part of Rich Text Processing APIs.

## Public Functions

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

## Static Public Members

QList<QByteArray> | supportedDocumentFormats()

## Detailed Description

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.

Call 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.

Call 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.

## Member Function Documentation

### QTextDocumentWriter::QTextDocumentWriter()

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

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

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

### `[explicit]` 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. If format is not provided, QTextDocumentWriter will detect the document format by inspecting the extension of fileName.

### `[noexcept]` QTextDocumentWriter::~QTextDocumentWriter()

Destroys the QTextDocumentWriter object.

### QIODevice *QTextDocumentWriter::device() const

Returns the device currently assigned, or `nullptr` if no device has been assigned.

See also setDevice().

### QString QTextDocumentWriter::fileName() const

If the currently assigned device is a QFile, or if 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.

See also setFileName() and setDevice().

### QByteArray QTextDocumentWriter::format() const

Returns the format used for writing documents.

See also setFormat().

### 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.

If the device is not already open, QTextDocumentWriter will attempt to open the device in WriteOnly mode by calling open().

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

See also device() and setFileName().

### void QTextDocumentWriter::setFileName(const QString &fileName)

Sets the name of the file to be written to fileName. Internally, QTextDocumentWriter will create a QFile and open it in WriteOnly mode, and use this file when writing the document.

See also fileName() and setDevice().

### void QTextDocumentWriter::setFormat(const QByteArray &format)

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

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

You can call supportedDocumentFormats() for the full list of formats QTextDocumentWriter supports.

See also format().

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

Returns the list of document formats supported by QTextDocumentWriter.

By default, Qt can write the following formats:

Format | Description
--- | ---
plaintext | Plain text
HTML | HyperText Markup Language
markdown | Markdown (CommonMark or GitHub dialects)
ODF | OpenDocument Format

See also setFormat().

### bool QTextDocumentWriter::write(const QTextDocument *document)

Writes the given document to the assigned device or file and returns `true` if successful; otherwise returns `false`.

### bool QTextDocumentWriter::write(const QTextDocumentFragment &fragment)

Writes the document fragment specified by fragment to the assigned device or file and returns `true` if successful; otherwise returns `false`.