平谷区网站建设,wordpress服务器不支持中文tag,乐清网红,二级域名解析查询第三代软件开发-保存PDF 文章目录 第三代软件开发-保存PDF项目介绍保存PDF头文件源文件使用 关键字#xff1a;
Qt、
Qml、
pdf、
painter、
打印 项目介绍 欢迎来到我们的 QML C 项目#xff01;这个项目结合了 QML#xff08;Qt Meta-Object Language#xff…
第三代软件开发-保存PDF 文章目录 第三代软件开发-保存PDF项目介绍保存PDF头文件源文件使用 关键字
Qt、
Qml、
pdf、
painter、
打印 项目介绍 欢迎来到我们的 QML C 项目这个项目结合了 QMLQt Meta-Object Language和 C 的强大功能旨在开发出色的用户界面和高性能的后端逻辑。 在项目中我们利用 QML 的声明式语法和可视化设计能力创建出现代化的用户界面。通过直观的编码和可重用的组件我们能够迅速开发出丰富多样的界面效果和动画效果。同时我们利用 QML 强大的集成能力轻松将 C 的底层逻辑和数据模型集成到前端界面中。 在后端方面我们使用 C 编写高性能的算法、数据处理和计算逻辑。C 是一种强大的编程语言能够提供卓越的性能和可扩展性。我们的团队致力于优化代码减少资源消耗以确保我们的项目在各种平台和设备上都能够高效运行。 无论您是对 QML 和 C 开发感兴趣还是需要我们为您构建复杂的用户界面和后端逻辑我们都随时准备为您提供支持。请随时联系我们让我们一同打造现代化、高性能的 QML C 项目 重要说明☝
☀该专栏在第三代软开发更新完将涨价
保存PDF
这个其实如果是QWidget开发那就很简单了直接有现成的打印模块但是QML下是没有的这里就需要重新写一下首先还是需要我们使用Qt的打印模块
QT printsupport 这里需要说明一下这个文件不是原创是在GitHub上找到另一个完了做了修改。
头文件
#ifndef XXXX_PRINT_H
#define XXXX_PRINT_H#include QObject
#ifndef QT_NO_PRINTER
#include QPrinter
#include QPrintDialog
#endif
#include QQuickItem
#include QJSValue
#include QDirclass XXXX_Print : public QQuickItem
{Q_OBJECT
// QML_ELEMENTQ_DISABLE_COPY(XXXX_Print)public:typedef enum { Print, PrintToFile, GrabOnly } GrabMode;Q_ENUMS(GrabMode);private:QSharedPointerQQuickItemGrabResult m_result;// 打印的qml组件QQuickItem *m_item;
#ifndef QT_NO_PRINTERQPrintDialog *m_printDialogue;QPrinter *m_printer;bool m_pagePrinted;bool m_sessionOpen;// 指定调用“print()”将产生多少份副本int m_copyCount;QPainter *m_painter;// 启用或禁用抗锯齿bool m_antialias;// 启用或禁用单色打印例如热敏打印机bool m_monochrome;// 选择“打印到文件”时要打印到的文件路径在某些平台上QString m_filepath;QRectF m_margins;
#endifGrabMode m_mode;QString m_fileDest;QString m_fileType;int m_fileQuality;QJSValue m_callback;Q_PROPERTY(QQuickItem* item READ getItem WRITE setItem NOTIFY itemChanged)
#ifndef QT_NO_PRINTERQ_PROPERTY(QString filepath READ getFilePath WRITE setFilePath NOTIFY filePathChanged)Q_PROPERTY(QString fileDest READ fileDest WRITE setFileDest NOTIFY fileDestChanged)Q_PROPERTY(bool antialias READ getAntialias WRITE setAntialias NOTIFY antialiasChanged)Q_PROPERTY(bool monochrome READ getMonochrome WRITE setMonochrome NOTIFY monochromeChanged)// 打印的 dpi 整数分辨率Q_PROPERTY(int resolution READ getResolution WRITE setResolution NOTIFY resolutionChanged)Q_PROPERTY(int copyCount READ getCopyCount WRITE setCopyCount NOTIFY copyCountChanged)// QRectF 对象表示以设备像素为单位的页面尺寸Q_PROPERTY(QRectF pageRect READ getPageRect NOTIFY sizeChanged)Q_PROPERTY(QRectF paperRect READ getPaperRect NOTIFY sizeChanged)Q_PROPERTY(QStringList paperSizes READ getPaperSizes)Q_PROPERTY(QString printerName READ getPrinterName WRITE setPrinterName NOTIFY printerNameChanged)Q_PROPERTY(Status status READ getStatus)
#endifpublic:XXXX_Print(QQuickItem *parent 0);~XXXX_Print();#ifndef QT_NO_PRINTERtypedef enum {Millimeter QPageSize::Millimeter,Point QPageSize::Point,Inch QPageSize::Inch,Pica QPageSize::Pica,Didot QPageSize::Didot,Cicero QPageSize::Cicero,DevicePixel} Unit;Q_ENUMS(Unit)typedef enum {Idle QPrinter::Idle,Active QPrinter::Active,Aborted QPrinter::Aborted,Error QPrinter::Error,Unknown} Status;Q_ENUMS(Status)
#endifpublic slots:
#ifndef QT_NO_PRINTERbool print(QJSValue callbackQJSValue());bool setup(bool bDialogue false);bool open();bool close();bool newPage() const;bool abort();
#endifbool grabImage(const QString fileFormat, int quality100, QJSValue callbackQJSValue());bool saveImage(const QString fileName, const QString fileFormat, int quality, QJSValue callbackQJSValue());// Property Hooks:void setItem( QQuickItem *item );
#ifndef QT_NO_PRINTERvoid setFilePath(const QString filepath);void setFileDest(const QString newFileDest);void setMonochrome(bool toggle);void setAntialias(bool toggle);void setMargins(double top, double right, double bottom, double left);bool setPageSize( qreal width, qreal height, Unit unit );bool setPageSize( const QString paperSize );void setPrinterName(const QString printerName);void setResolution(int dpi);void setCopyCount(int count);
#endifQQuickItem *getItem() const { return m_item; }
#ifndef QT_NO_PRINTERQString getFilePath() const { return m_filepath; }const QString fileDest() const { return m_fileDest; };bool getMonochrome() const { return m_monochrome; }bool getAntialias() const { return m_antialias; }QRectF getMargins() const { return m_margins; }QRectF getPageRect(Unit unitDevicePixel) const;QRectF getPaperRect(Unit unitDevicePixel) const;QStringList getPaperSizes() const;QString getPrinterName() const;int getResolution() const { return m_printer-resolution(); }int getCopyCount() const { return m_printer-copyCount(); }Status getStatus() const;
#endifprivate slots:bool grab();void grabbed();private:bool printGrab(const QImage img);bool isDirExist(QString fullPath);signals:void itemChanged();void frameGrabbed(const QByteArray imageData);void sizeChanged();void printComplete();void printError();
#ifndef QT_NO_PRINTERvoid filePathChanged();void monochromeChanged();void antialiasChanged();void marginsChanged();void printerNameChanged();void resolutionChanged();void copyCountChanged();
#endifvoid fileDestChanged();void strTestChanged();
};#endif // XXXX_PRINT_H
源文件
#include XXXX_print.h#include QBuffer
#include QFileInfo
#include QPainter
#ifndef QT_NO_PRINTER
# include QPrintEngine
#endif
#include QQuickItemGrabResult// Just for converting QByteArray:
#include QQmlEnginevoid XXXX_Print::setFileDest(const QString newFileDest)
{if (m_fileDest newFileDest)return;m_fileDest newFileDest;emit fileDestChanged();
}XXXX_Print::XXXX_Print(QQuickItem *parent):QQuickItem(parent)
{
#ifndef QT_NO_PRINTERm_printDialogue nullptr;m_printer new QPrinter(QPrinter::ScreenResolution);m_pagePrinted false;m_sessionOpen false;m_copyCount 1;m_painter nullptr;m_antialias true;m_monochrome false;m_margins QRectF(0, 0, 0, 0);m_filepath.clear();
#endifm_mode XXXX_Print::GrabOnly;m_item NULL;m_fileDest.clear();m_fileType.clear();m_fileQuality 0;
}XXXX_Print::~XXXX_Print()
{
#ifndef QT_NO_PRINTERdelete m_printer;
#endif
}#ifndef QT_NO_PRINTER
/*** brief XXXX_Print::print 打印/保存PDF打印 setup至true* param callback* return*/
bool XXXX_Print::print(QJSValue callback)
{m_mode XXXX_Print::Print;m_callback callback;return grab();
}
#endif/*** brief XXXX_Print::grabImage 图片以QByteArray存储* param fileFormat* param quality* param callback* return*/
bool XXXX_Print::grabImage(const QString fileFormat, int quality, QJSValue callback)
{m_mode XXXX_Print::GrabOnly;m_callback callback;m_fileType fileFormat;m_fileQuality quality;return grab();
}/*** brief XXXX_Print::saveImage 保存图片不用打开* param fileName 图片名称* param fileFormat 图片类型* param quality 图片像素-1 0-100* param callback* return*/
bool XXXX_Print::saveImage(const QString fileName, const QString fileFormat, int quality, QJSValue callback)
{m_mode XXXX_Print::PrintToFile;m_callback callback;m_fileDest fileName;m_fileType fileFormat;m_fileQuality quality;return grab();
}#ifndef QT_NO_PRINTER
/*** brief XXXX_Print::setup 初始化打印机(true)/存储PDF(false)* param bDialogue* return*/
bool XXXX_Print::setup(bool bDialogue)
{m_printer-setOutputFormat(QPrinter::NativeFormat);QMarginsF margins( 0.0, 0.0, 0.0, 0.0);if( !m_printer-setPageMargins( margins, QPageLayout::Millimeter ) ){qWarning() tr(Printer: Failed to set page margin (in mm) as configured.);return false;}QString strFilePath QCoreApplication::applicationDirPath();m_printer-setOutputFileName(m_filepath m_fileDest); //设置输出路径if(bDialogue){m_printDialogue new QPrintDialog(m_printer);if( m_printDialogue-exec() QDialog::Accepted ){m_printDialogue-deleteLater();return true;}qWarning() 打印机初始化失败;delete m_printDialogue;}else{// HP LaserJet Pro M428f-M429f [453773]m_printer-setOutputFormat(QPrinter::PdfFormat); //设置输出格式为pdfreturn true;}return false;
}/*** brief XXXX_Print::open 打开打印机/存储* return*/
bool XXXX_Print::open()
{if( m_sessionOpen ){qCritical() tr(Printer::open called while already in a multipage session. (Call close first.));return false;}m_painter new QPainter();if( !m_painter ){qCritical() tr(Printer::open failed to instantiate new QPainter. (Are you out of memory?));return false;}if(!m_painter-begin(m_printer)){qCritical() tr(Failed to initialise QPainter to QPrintDevice.);return false;}m_painter-setRenderHint(QPainter::Antialiasing, m_antialias);m_painter-setRenderHint(QPainter::TextAntialiasing, m_antialias);m_painter-setRenderHint(QPainter::SmoothPixmapTransform, m_antialias);m_sessionOpen true;return true;
}/*** brief XXXX_Print::close 关闭打印机/存储* return*/
bool XXXX_Print::close()
{if( !m_sessionOpen ){qCritical() tr(Printer::close called while not in multipage session.);return false;}delete m_painter;m_painter nullptr;m_sessionOpen false;return true;
}/*** brief XXXX_Print::newPage 下一页* return*/
bool XXXX_Print::newPage() const
{if( !m_sessionOpen ){qCritical() tr(Printer::newPage called while not in a multipage session. (Call Printer::open first.));return false;}return m_printer-newPage();
}/*** brief XXXX_Print::abort 中止打印机* return*/
bool XXXX_Print::abort()
{if( m_sessionOpen )close();return m_printer-abort();
}void XXXX_Print::setMonochrome(bool toggle)
{if( m_monochrome toggle )return;m_monochrome toggle;emit monochromeChanged();
}void XXXX_Print::setAntialias(bool toggle)
{if( m_antialias toggle )return;m_antialias toggle;emit antialiasChanged();
}void XXXX_Print::setFilePath(const QString filepath)
{if( m_filepath filepath )return;isDirExist(filepath);m_filepath filepath;emit filePathChanged();
}
#endifvoid XXXX_Print::setItem(QQuickItem *item)
{if( m_item item )return;m_item item;emit itemChanged();
}#ifndef QT_NO_PRINTER
void XXXX_Print::setMargins(double top, double right, double bottom, double left)
{QRectF m( left, top, right-left, bottom-top );if( m_margins m )return;m_margins m;emit marginsChanged();
}bool XXXX_Print::setPageSize( const QString paperSize )
{QPageSize size;// Run through each..for( int x0; x QPageSize::LastPageSize; x ){size QPageSize((QPageSize::PageSizeId)x);if( size.name() paperSize ){bool result m_printer-setPageSize( size );emit sizeChanged();return result;}}qWarning() tr(Unknown paper size: ) paperSize tr( (Refer to paperSizes() for valid options.));return false;
}bool XXXX_Print::setPageSize( qreal width, qreal height, Unit unit )
{QSizeF szf(width, height);QPageSize size;switch( unit ){case DevicePixel:// Fanagle from DPI:szf / m_printer-resolution();size QPageSize(szf, QPageSize::Inch);break;default:size QPageSize(szf, (QPageSize::Unit)unit);break;}bool result m_printer-setPageSize(size);emit sizeChanged();return result;
}void XXXX_Print::setPrinterName(const QString printerName)
{if( m_printer-printerName() printerName )return;m_printer-setPrinterName( printerName );emit printerNameChanged();
}void XXXX_Print::setResolution(int dpi)
{if( m_printer-resolution() dpi )return;m_printer-setResolution( dpi );emit resolutionChanged();
}void XXXX_Print::setCopyCount(int count)
{if( m_printer-copyCount() count )return;m_printer-setCopyCount( count );emit copyCountChanged();
}QRectF XXXX_Print::getPageRect(Unit unit) const
{return m_printer-pageRect( (QPrinter::Unit)unit );
}QRectF XXXX_Print::getPaperRect(Unit unit) const
{return m_printer-paperRect( (QPrinter::Unit)unit );
}QStringList XXXX_Print::getPaperSizes() const
{QStringList results;QPageSize size;// Run through each..for( int x0; x QPageSize::LastPageSize; x ){size QPageSize((QPageSize::PageSizeId)x);results.append( size.name() );}return results;
}XXXX_Print::Status XXXX_Print::getStatus() const
{QPrinter::PrinterState state m_printer-printEngine()-printerState();return (XXXX_Print::Status)state;
}
#endifbool XXXX_Print::grab()
{if( !m_item ){qWarning() tr(Printer::grab: No item source specified. (Set it with the item property.));return false;}QSharedPointerQQuickItemGrabResult res m_item-grabToImage();if( !res ){qWarning() tr(Printer::grab: Grab failed for some reason. (Is the item loaded and rendered?));return false;}connect( res.data(), SIGNAL(ready()), this, SLOT(grabbed()) );m_result res;return true;
}#ifndef QT_NO_PRINTER
bool XXXX_Print::printGrab(const QImage img)
{if( !m_sessionOpen ){qCritical() tr(Printer: Attempt to print without first calling Printer::open(). (This behaviour changed in 1.2));;return false;}if( m_monochrome )m_painter-drawImage( m_printer-paperRect(QPrinter::DevicePixel), img.convertToFormat(QImage::Format_Mono, Qt::MonoOnly | Qt::ThresholdDither) );elsem_painter-drawImage( m_printer-paperRect(QPrinter::DevicePixel), img );return true;
}/*** brief XXXX_Print::isDirExist 判断文件夹是否存在不存在则创建* param fullPath* return*/
bool XXXX_Print::isDirExist(QString fullPath)
{
// QString strFilePath QCoreApplication::applicationDirPath();QDir dir(fullPath);if(dir.exists()){return true;}else{return dir.mkdir(fullPath);}
}
#endifvoid XXXX_Print::grabbed()
{const QImage img m_result.data()-image();m_result.clear();QQmlEngine *jse qmlEngine(this);jse-collectGarbage();bool ret true;if( m_mode XXXX_Print::PrintToFile ){ret img.save(m_fileDest, m_fileType.toStdString().c_str(), m_fileQuality);if( m_callback.isCallable() ){QJSValueList args;args ret;m_callback.call(args);}}
#ifndef QT_NO_PRINTERelse if( m_mode XXXX_Print::Print ){ret printGrab(img);if( m_callback.isCallable() ){QJSValueList args;args ret;m_callback.call(args);}}
#endifelse if( m_callback.isCallable() ){QImage image;QByteArray ba;QBuffer buffer(ba);buffer.open(QIODevice::WriteOnly);// 此函数将 QImage 写入给定设备ret img.save(buffer, m_fileType.toStdString().c_str(), m_fileQuality);buffer.close();if( ret ){QJSValueList args;args jse-toScriptValueQByteArray(ba);m_callback.call( args );}}// m_callback QJSValue();if( ret )emit printComplete();elseemit printError();
}#ifndef QT_NO_PRINTER
QString XXXX_Print::getPrinterName() const
{return m_printer-printerName();
}
#endif
使用 XXX_Print {id: printPDFfilepath: pdfFilePathfileDest: / UserProfile.userName dateString .pdfantialias: falsemonochrome: falseonPrintComplete: console.log(Print complete.);onPrintError: console.log(Print error!);Component.onCompleted: scanPaperSizes();function scanPaperSizes(){printPDF.setPageSize( A4 );printPDF.setMargins(0,0,0,0)}}
