- Qt 6.5
- Qt PDF
- C++ Classes
- QPdfDocument
- Qt 6.5.2 Reference Documentation

# QPdfDocument Class

The QPdfDocument class loads a PDF document and renders pages from it. More...

Header: | #include <QPdfDocument>
Inherits: | QObject

- List of all members, including inherited members

## Public Types

enum class | Error { None, Unknown, DataNotYetAvailable, FileNotFound, InvalidFileFormat, …, UnsupportedSecurityScheme }
enum class | MetaDataField { Title, Author, Subject, Keywords, Creator, …, ModificationDate }
enum class | PageModelRole { Label, PointSize }
enum class | Status { Null, Loading, Ready, Unloading, Error }

## Properties

- pageCount : const int
- pageModel : QAbstractListModel* const
- password : QString
- status : const Status

## Public Functions

| QPdfDocument(QObject *parent)
virtual | ~QPdfDocument() override
void | close()
QPdfDocument::Error | error() const
QPdfSelection | getAllText(int page)
QPdfSelection | getSelection(int page, QPointF start, QPointF end)
QPdfSelection | getSelectionAtIndex(int page, int startIndex, int maxLength)
QPdfDocument::Error | load(const QString &fileName)
void | load(QIODevice *device)
QVariant | metaData(QPdfDocument::MetaDataField field) const
int | pageCount() const
QString | pageLabel(int page)
QAbstractListModel * | pageModel()
QSizeF | pagePointSize(int page) const
QString | password() const
QImage | render(int page, QSize imageSize, QPdfDocumentRenderOptions renderOptions = QPdfDocumentRenderOptions())
void | setPassword(const QString &password)
QPdfDocument::Status | status() const

## Signals

void | pageCountChanged(int pageCount)
void | pageModelChanged()
void | passwordChanged()
void | statusChanged(QPdfDocument::Status status)

## Detailed Description

## Member Type Documentation

### enum class QPdfDocument::Error

This enum describes the error while attempting the last operation on the document.

Constant | Value | Description
--- | --- | ---
`QPdfDocument::Error::None` | `0` | No error occurred.
`QPdfDocument::Error::Unknown` | `1` | Unknown type of error.
`QPdfDocument::Error::DataNotYetAvailable` | `2` | The document is still loading, it's too early to attempt the operation.
`QPdfDocument::Error::FileNotFound` | `3` | The file given to load() was not found.
`QPdfDocument::Error::InvalidFileFormat` | `4` | The file given to load() is not a valid PDF file.
`QPdfDocument::Error::IncorrectPassword` | `5` | The password given to setPassword() is not correct for this file.
`QPdfDocument::Error::UnsupportedSecurityScheme` | `6` | QPdfDocument is not able to unlock this kind of PDF file.

See also QPdfDocument::error().

### enum class QPdfDocument::MetaDataField

This enum describes the available fields of meta data.

Constant | Value | Description
--- | --- | ---
`QPdfDocument::MetaDataField::Title` | `0` | The document's title as QString.
`QPdfDocument::MetaDataField::Author` | `2` | The name of the person who created the document as QString.
`QPdfDocument::MetaDataField::Subject` | `1` | The subject of the document as QString.
`QPdfDocument::MetaDataField::Keywords` | `3` | Keywords associated with the document as QString.
`QPdfDocument::MetaDataField::Creator` | `5` | If the document was converted to PDF from another format, the name of the conforming product that created the original document from which it was converted as QString.
`QPdfDocument::MetaDataField::Producer` | `4` | If the document was converted to PDF from another format, the name of the conforming product that converted it to PDF as QString.
`QPdfDocument::MetaDataField::CreationDate` | `6` | The date and time the document was created as QDateTime.
`QPdfDocument::MetaDataField::ModificationDate` | `7` | The date and time the document was most recently modified as QDateTime.

See also QPdfDocument::metaData().

### enum class QPdfDocument::PageModelRole

Roles in pageModel().

Constant | Value | Description
--- | --- | ---
`QPdfDocument::PageModelRole::Label` | `Qt::UserRole` | The page number to be used for display purposes (QString).
`QPdfDocument::PageModelRole::PointSize` | `257` | The page size in points (1/72 of an inch) (QSizeF).

### enum class QPdfDocument::Status

This enum describes the current status of the document.

Constant | Value | Description
--- | --- | ---
`QPdfDocument::Status::Null` | `0` | The initial status after the document has been created or after it has been closed.
`QPdfDocument::Status::Loading` | `1` | The status after load() has been called and before the document is fully loaded.
`QPdfDocument::Status::Ready` | `2` | The status when the document is fully loaded and its data can be accessed.
`QPdfDocument::Status::Unloading` | `3` | The status after close() has been called on an open document. At this point the document is still valid and all its data can be accessed.
`QPdfDocument::Status::Error` | `4` | The status after Loading, if loading has failed.

See also QPdfDocument::status().

## Property Documentation

### `[read-only]` pageCount : const int

This property holds the number of pages in the loaded document or `0` if no document is loaded.

Access functions:

int | pageCount() const

Notifier signal:

void | pageCountChanged(int pageCount)

### `[read-only]` pageModel : QAbstractListModel* const

This property holds an instance of QAbstractListModel to provide page-specific metadata, containing one row for each page in the document.

Access functions:

QAbstractListModel * | pageModel()

Notifier signal:

void | pageModelChanged()

See also QPdfDocument::PageModelRole.

### password : QString

This property holds the document password.

If the document is protected by a password, the user must provide it, and the application must set this property. Otherwise, it's not needed.

Access functions:

QString | password() const
void | setPassword(const QString &password)

Notifier signal:

void | passwordChanged()

### `[read-only]` status : const Status

This property holds the current status of the document.

Access functions:

QPdfDocument::Status | status() const

Notifier signal:

void | statusChanged(QPdfDocument::Status status)

## Member Function Documentation

### `[explicit]` QPdfDocument::QPdfDocument(QObject *parent)

Constructs a new document with parent object parent.

### `[override virtual]` QPdfDocument::~QPdfDocument()

Destroys the document.

### void QPdfDocument::close()

Closes the document.

### QPdfDocument::Error QPdfDocument::error() const

Returns the type of error if status is `Error`, or `NoError` if there is no error.

### `[invokable]` QPdfSelection QPdfDocument::getAllText(int page)

Returns all the text and its bounds on the given page.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

### `[invokable]` QPdfSelection QPdfDocument::getSelection(int page, QPointF start, QPointF end)

Returns information about the text on the given page that can be found between the given start and end points, if any.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

### `[invokable]` QPdfSelection QPdfDocument::getSelectionAtIndex(int page, int startIndex, int maxLength)

Returns information about the text on the given page that can be found beginning at the given startIndex with at most maxLength characters.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

### QPdfDocument::Error QPdfDocument::load(const QString &fileName)

Loads the document contents from fileName.

### void QPdfDocument::load(QIODevice *device)

Loads the document contents from device.

### QVariant QPdfDocument::metaData(QPdfDocument::MetaDataField field) const

Returns the meta data of the document for the given field.

### `[invokable]` QString QPdfDocument::pageLabel(int page)

Returns the page number to be used for display purposes.

For example, a document may have multiple sections with different numbering. Perhaps the preface uses roman numerals, the body starts on page 1, and the appendix starts at A1. Whenever a PDF viewer shows a page number, to avoid confusing the user it should be the same "number" as is printed on the corner of the page, rather than the zero-based page index that we use in APIs (assuming the document author has made the page labels match the printed numbers).

If the document does not have custom page numbering, this function returns `page + 1`.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

### `[invokable]` QSizeF QPdfDocument::pagePointSize(int page) const

Returns the size of page page in points (1/72 of an inch).

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

### QImage QPdfDocument::render(int page, QSize imageSize, QPdfDocumentRenderOptions renderOptions = QPdfDocumentRenderOptions())

Renders the page into a QImage of size imageSize according to the provided renderOptions.

Returns the rendered page or an empty image in case of an error.

Note: If the imageSize does not match the aspect ratio of the page in the PDF document, the page is rendered scaled, so that it covers the complete imageSize.