QPdfDocument 類

QPdfDocument 類加載 PDF 文檔並渲染其頁麵。 更多...

頭：	#include <QPdfDocument>
繼承：	QObject

• 所有成員列錶，包括繼承成員

公共類型

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

特性

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

公共函數

	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

信號

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

詳細描述

成員類型文檔編製

enum class QPdfDocument:: Error

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

常量	值	描述
QPdfDocument::Error::None	0	沒有齣現錯誤。
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.

另請參閱 QPdfDocument::error ().

enum class QPdfDocument:: MetaDataField

此枚舉描述元數據的可用字段。

常量	值	描述
QPdfDocument::MetaDataField::Title	0	文檔的標題作為 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 .

另請參閱 QPdfDocument::metaData ().

enum class QPdfDocument:: PageModelRole

Roles in pageModel ().

常量	值	描述
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

此枚舉描述文檔的當前狀態。

常量	值	描述
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	加載後的狀態，若加載失敗。

另請參閱 QPdfDocument::status ().

特性文檔編製

[read-only] pageCount : const int

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

訪問函數：

int	pageCount () const

通知程序信號：

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.

訪問函數：

QAbstractListModel *

pageModel ()

通知程序信號：

void	pageModelChanged ()

另請參閱 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.

訪問函數：

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

通知程序信號：

void	passwordChanged ()

[read-only] status : const Status

This property holds the current status of the document.

訪問函數：

QPdfDocument::Status

status () const

通知程序信號：

void	statusChanged (QPdfDocument::Status status )

成員函數文檔編製

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

構造新文檔采用父級對象 parent .

[override virtual] QPdfDocument:: ~QPdfDocument ()

銷毀文檔。

void QPdfDocument:: close ()

關閉文檔。

QPdfDocument::Error QPdfDocument:: error () const

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

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

返迴所有文本及其邊界在給定 page .

注意： 此函數可以被援引，通過元對象係統和從 QML。見 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.

注意： 此函數可以被援引，通過元對象係統和從 QML。見 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 字符。

注意： 此函數可以被援引，通過元對象係統和從 QML。見 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 )

返迴 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 .

注意： 此函數可以被援引，通過元對象係統和從 QML。見 Q_INVOKABLE .

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

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

注意： 此函數可以被援引，通過元對象係統和從 QML。見 Q_INVOKABLE .

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

渲染 page 成 QImage 的大小 imageSize according to the provided renderOptions .

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

注意：若 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 .

內容

1. 公共類型

2. 特性

3. 公共函數

4. 信號

5. 詳細描述