#QT# PDF文件处理

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· 2022-04-24

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pro文件配置

QT5把所有打印的相关类，包括QPrinter、QPrintDialog都放到了Qt Print Support模块，如果你只是在.cpp文件中包含QPrinter库，在编译阶段就会报错，你需要先修改.pro文件，加上这句：QT += printsupport

H头文件增加相关的库

#include<QPrinter>

#include<QUrl>

#include<QFileDialog>

#include<QDesktopServices>

#include<QRect>

#include<QDateTime>

#include<QFile>

#include<QPainter>

#include<QPdfWriter>

#include<QDebug>

#include<QTextDocument>

#include<QPixmap>

#include<QMessageBox>

#include

#include<QTextEdit>

#include<QPrintPreviewDialog>

H头文件定义

-增加相关函数声明

voidqprinter_pdf();

voidqpdfwriter_pdf();

voidqtextdocument_pdf();

voidpicture_to_pdf();

voidtext_to_pdf();

voidhtml_to_pdf();

voidcomplex_pdf();

voidpdfDrawForm(QPainter*paint,inty,inthorzBorder,introw,intcolumn,intunitHeight,QFont&font,QStringList&list);

voidcreate_pdf();

voidPrintPreview();

voidPreview(QPrinter*printer);

-增加相关的控件

QTextEdit*textEdit;

QPrintPreviewDialog*printPreview;

CPP文件增加相关的函数定义

-基于QPrinter生成PDF文件

voidMainWindow::qprinter_pdf()

{

QStringpdfName="E://"+QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")+".pdf";

QStringpdfPath=QFileDialog::getSaveFileName(this,"SavePdf",pdfName,"*.pdf");

if(pdfPath.isEmpty())

{

return;

}

QPrinterprinter(QPrinter::PrinterMode::HighResolution);

printer.setOutputFormat(QPrinter::PdfFormat);

printer.setPageSize(QPagedPaintDevice::A4);

printer.setOutputFileName(pdfPath);

printer.setOrientation(QPrinter::Landscape);

printer.setPageMargins(10,10,10,10,QPrinter::Millimeter);

QPainterpainter;

painter.begin(&printer);

//设置字体属性

QFontfont;

font.setFamily("宋体");

font.setBold(true);

font.setWeight(15);

font.setUnderline(true);

painter.setFont(font);

//设置画笔颜色

QPenpen;

pen.setColor(Qt::green);

painter.setPen(pen);

//开始绘制

painter.drawText(QRect(0,100,printer.width(),printer.height()),"111111");

painter.drawText(QRect(0,400,printer.width(),printer.height()),"222222222222222222222222");

//新一页

printer.newPage();

painter.drawText(QRect(0,0,printer.width(),printer.height()),"3333333333333333333333333");

painter.end();

//打开PDF

QDesktopServices::openUrl(QUrl(pdfPath));

}

-基于QPdfWriter生成PDF文件

voidMainWindow::qpdfwriter_pdf()

{

QStringpdfName="E://"+QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")+".pdf";

QStringpdfPath=QFileDialog::getSaveFileName(this,"QPdfWriter方式导出PDF",pdfName,"*.pdf");

if(pdfPath.isEmpty())

{

return;

}

QFilepdfFile(pdfPath);

if(pdfFile.open(QIODevice::WriteOnly))

{

//实例化写入对象

QPdfWriter*writer=newQPdfWriter(&pdfFile);

//设置纸张属性（ps：有反馈说设置其他纸张类型，但是打印机还是A4的格式，楼主没有打印件所以没得测试有条件可以测试下）

writer->setPageSize(QPagedPaintDevice::A4);

//设置dpi好像基本都是设置300像素

writer->setResolution(300);

//设置边距

writer->setPageMargins(QMarginsF(20,20,20,20));

QPainter*painter=newQPainter(writer);

painter->setFont(QFont("宋体",13));

//开始绘制内容

intstart=10;

painter->drawText(QRect(0,start,writer->width(),100),Qt::AlignCenter,"标题");

start+=120;

// QPenpen;

// pen.setColor(Qt::gray);

painter->setPen(QPen(QBrush(QColor(0,0,0)),5));

painter->drawLine(0,start,writer->width(),start);

start+=120;

painter->drawText(QRect(0,start,writer->width(),100),Qt::AlignLeft,"标题1");

deletepainter;

painter=nullptr;

deletewriter;

writer=nullptr;

//打开

QDesktopServices::openUrl(pdfPath);

pdfFile.close();

}

-基于QTextdocument生成PDF文件

voidMainWindow::qtextdocument_pdf()

    QStringpdfName="E://"+QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")+".pdf";

    QStringpdfPath=QFileDialog::getSaveFileName(this,"QPdfWriter方式导出PDF",pdfName,"*.pdf");

    if(pdfPath.isEmpty())

        return;

    QPrinterprinter;

    printer.setOutputFormat(QPrinter::PdfFormat);

    printer.setPageSize(QPagedPaintDevice::A4);

    printer.setOutputFileName(pdfPath);

    printer.setOrientation(QPrinter::Portrait);//默认页面方向

    printer.setPageMargins(5,5,5,5,QPrinter::Millimeter);//设置边距

    //绘制的内容

    QStringhtml=QString("width='600'border='1'align='center'frame='border'cellspacing='0'cellpadding='3px'rules='all'>");

    html+="";

    //表头

    QStringListheaders;

    headers<<"标题1"<<"标题2"<<"标题3"<<"标题4"<<"标题5";

    for(QStringti:headers)

        html+=QString("%1").arg(ti);

    html+="";

    qDebug()<<"html:"<<html;

    //单元格内容

    for(inti=0;i<10;i++)

        html+="";

        for(intj=0;j<headers.count();j++)

            html+=QString("内容%1").arg(j+1);

        html+="";

    html+="";

    qDebug()<<"html:"<<html;

    QTextDocumenttextDoc;

    textDoc.setHtml(html);

    textDoc.print(&printer);

//

    QDesktopServices::openUrl(QUrl(pdfPath));

-将图片保存成PDF文件

voidMainWindow::picture_to_pdf()

    QPrinterprinter_pixmap(QPrinter::HighResolution);

    printer_pixmap.setPageSize(QPrinter::A4);  //设置纸张大小为A4

    printer_pixmap.setOutputFormat(QPrinter::PdfFormat);  //设置输出格式为pdf

    printer_pixmap.setOutputFileName("E:\\test_pixmap.pdf");   //设置输出路径

    QPixmappixmap;

    pixmap.load("E:\\p.png");  //获取界面的图片

    QPainterpainter_pixmap;

    painter_pixmap.begin(&printer_pixmap);

    QRectrect=painter_pixmap.viewport();

    intmultiple=rect.width()/pixmap.width();

    painter_pixmap.scale(multiple,multiple);//将图像(所有要画的东西)在pdf上放大multiple-1倍

    painter_pixmap.drawPixmap(0,0,pixmap);  //画图

    painter_pixmap.end();

-将文本保存成PDF文件

voidMainWindow::text_to_pdf()

    QFilepdfFile("d:\\test.pdf");//输出文件名

        if(!pdfFile.open(QIODevice::WriteOnly))

            QMessageBox::warning(this,tr("writeFile"),tr("Cannotopenfile:\n%1").arg("d:\\test.pdf"));

            return;

        QPdfWriter*pdfWriter=newQPdfWriter(&pdfFile);               //实例化QPdfWriter可以设置PDF文件的一些参数

        pdfWriter->setPageSize(QPagedPaintDevice::A4);                  //设置纸张为A4纸

        pdfWriter->setResolution(QPrinter::ScreenResolution);           //设置分辨率屏幕分辨率打印机分辨率高分辨率

        pdfWriter->setPageMargins(QMarginsF(40,40,40,40));           //设置页边距顺序是:左上右下

        QPainter*pdfPainter=newQPainter(pdfWriter);                //qt绘制工具

        //设置标题

        QTextOptionoption(Qt::AlignCenter);                           //标题居中显示

        option.setWrapMode(QTextOption::WordWrap);                     //标题自动换行

        //设置标题字体需要使用QT的QFont

        QFontfont;

        font.setFamily("MicrosoftYaHei");                            //设置字体微软雅黑、宋体之类的

        font.setPointSize(22);                                        //设置字体大小

        //font.setItalic(true);//斜体

        //font.setUnderline(true);//设置下划线

        font.setBold(true);                                           //加粗

        pdfPainter->setFont(font);

        pdfPainter->drawText(QRect(3000,0,2100,450),QString::fromLocal8Bit("标题"),option);//距离左边3000,上面0,标题字宽度2100，标题字高450（如果字显示不全，可以适当调整）

        pdfWriter->newPage();                                         //换一页

        //设置内容

        option.setAlignment(Qt::AlignLeft);

        font.setPointSize(14);                                       //字体大小14

        pdfPainter->setFont(font);

        pdfPainter->drawText(QRect(500,20,8000,300),

            QString::fromLocal8Bit("我是第一行我是第一行我是第一行我是第一行我是第一行我是第一行我是第一"));

        pdfPainter->drawText(QRect(0,320,8500,300),

            QString::fromLocal8Bit("我是后续我是后续我是后续我是后续我是后续我是后续我是后续我是后续我是后续"),option);

        pdfPainter->drawText(QRect(0,620,8500,300),

            QString::fromLocal8Bit("我是后续我是后续我是后续我是后续我是后续我是后续我是后续我是后续我是后续"),option);

        deletepdfPainter;

        deletepdfWriter;

        pdfFile.close();

        QDesktopServices::openUrl(QUrl::fromLocalFile("d:\\test.pdf"));

-将网页保存成PDF文件

voidMainWindow::html_to_pdf()

    QFilepdfFile("d:\\test.pdf");//输出文件名

    if(!pdfFile.open(QIODevice::WriteOnly))

        QMessageBox::warning(this,tr("writeFile"),tr("Cannotopenfile:\n%1").arg("d:\\test.pdf"));

        return;

    QPdfWriter*pdfWriter=newQPdfWriter(&pdfFile);               //实例化QPdfWriter可以设置PDF文件的一些参数

    pdfWriter->setPageSize(QPagedPaintDevice::A4);                  //设置纸张为A4纸

    pdfWriter->setResolution(QPrinter::ScreenResolution);           //设置分辨率屏幕分辨率打印机分辨率高分辨率

    pdfWriter->setPageMargins(QMarginsF(40,40,40,40));//设置页边距顺序是:左上右下

    QTextDocumenttext_document;

    QStringhtml=QString("border=\"6\">").append(QStringLiteral("薪资")).append("")

            .append(QStringLiteral("工号")).append("").append(QStringLiteral("姓名")).append("")

            .append(QStringLiteral("薪资")).append("101102103123124125");

    text_document.setHtml(html);

    text_document.print(pdfWriter);

    text_document.end();

    QDesktopServices::openUrl(QUrl::fromLocalFile("d:\\test.pdf"));

-生成复杂的PDF文件

voidMainWindow::complex_pdf()

{

//创建PDF文件

QStringfile_path=QApplication::applicationDirPath()+"/text.pdf";

QFilepdfFile(file_path);

pdfFile.open(QIODevice::WriteOnly);

QPdfWriter*pWriter=newQPdfWriter(&pdfFile);

pWriter->setPageSize(QPagedPaintDevice::A4);

pWriter->setResolution(300);

pWriter->setPageMargins(QMarginsF(30,30,30,30));

QPainter*pPainter=newQPainter(pWriter);

QFontfont[5]={QFont("宋体",26,60),QFont("宋体",26,61),QFont("宋体",26,QFont::Normal),QFont("宋体",26,QFont::Normal),QFont("宋体",26,QFont::Normal)};

font[0].setPixelSize(86);

font[1].setPixelSize(61);

font[2].setPixelSize(61);

font[3].setPixelSize(42);

font[4].setPixelSize(54);

qDebug()<<pPainter->viewport().width()<<""<<pPainter->viewport().height();

intnPDFWidth=pPainter->viewport().width();

intnPDFHeight=pPainter->viewport().height();

//标题

inty=10;

pPainter->setFont(font[0]);

pPainter->drawText(QRect(0,y,nPDFWidth,100),Qt::AlignCenter,QString("这是第一个PDF文档"));

//画两条横线

y+=140;

pPainter->setPen(QPen(QBrush(QColor(0,0,0)),5));

pPainter->drawLine(0,y,nPDFWidth,y);

pPainter->drawLine(0,y+18,nPDFWidth,y+18);

//添加文字

y+=60;

pPainter->setFont(font[2]);

pPainter->drawText(QRect(100,y,nPDFWidth/2,70),Qt::AlignVCenter|Qt::AlignLeft,QString("器件型号:YT-CR810"));

pPainter->setFont(font[2]);

pPainter->drawText(QRect(nPDFWidth/2+100,y,nPDFWidth/2-100,70),Qt::AlignVCenter|Qt::AlignLeft,QString("器件编号:YT-CR810"));

y+=90;

pPainter->setFont(font[2]);

pPainter->drawText(QRect(100,y,nPDFWidth/2,70),Qt::AlignVCenter|Qt::AlignLeft,QString("装车车号:YT-CR810"));

pPainter->setFont(font[2]);

pPainter->drawText(QRect(nPDFWidth/2+100,y,nPDFWidth/2-100,70),Qt::AlignVCenter|Qt::AlignLeft,QString("实验日期:YT-CR810"));

//小标题

y+=110;

pPainter->setFont(font[1]);

pPainter->drawText(QRect(0,y,nPDFWidth,80),Qt::AlignVCenter|Qt::AlignLeft,"减振器标准参数");

//画表格

y+=120;

QStringListlist;

list<<"速度"<<"压力"<<"拉力"<<"阻尼系数"<<"不对称率"<<"正允差"<<"负允差";

list<<"12.5m/s"<<"17KN"<<"15KN"<<"1.3kNs/m"<<"12%"<<"13%"<<"14%";

pdfDrawForm(pPainter,y,0,2,7,100,font[3],list);

y+=260;

pPainter->setFont(font[1]);

pPainter->drawText(QRect(0,y,nPDFWidth,80),Qt::AlignVCenter|Qt::AlignLeft,"示功图");

//插入图片

y+=100;

intimageBorder=150;

QPixmappixmap=QPixmap::grabWidget(this,this->rect());

floatx=(float)(nPDFWidth-imageBorder*2)/(float)pixmap.width();

pixmap=pixmap.scaled(nPDFWidth-imageBorder*2,x*pixmap.height(),Qt::IgnoreAspectRatio);

pPainter->drawPixmap(imageBorder,y,pixmap);

y+=pixmap.height()+90;

pPainter->setFont(font[1]);

pPainter->drawText(QRect(0,y,nPDFWidth,80),Qt::AlignVCenter|Qt::AlignLeft,"减震器测试结果");

y+=120;

list.clear();

list<<"拉伸行程"<<"0.00mm"<<"压缩行程"<<"0.00mm"<<"最大速度"<<"0.000m/s"<<"阻尼系数"<<"0.00kNs/m"

<<"最大压力"<<"0.00kN"<<"压力偏差"<<"0.00%"<<"最大拉力"<<"0.00kN"<<"拉力偏差"<<"0.00%"

<<"不对称率"<<"0.00%"<<"运动时间"<<"5S"<<"实验结果"<<"100%"<<"曲线结论"<<"100";

pdfDrawForm(pPainter,y,0,3,8,100,font[3],list);

pPainter->setFont(font[4]);

pPainter->drawText(QRect(50,nPDFHeight,nPDFWidth/3,80),Qt::AlignVCenter|Qt::AlignLeft,QString("试验员:张三"));

pPainter->drawText(QRect(nPDFWidth/3+50,nPDFHeight,nPDFWidth/3,80),Qt::AlignVCenter|Qt::AlignLeft,QString("检查员签字:"));

pPainter->drawText(QRect(nPDFWidth/3*2,nPDFHeight,nPDFWidth/3,80),Qt::AlignVCenter|Qt::AlignLeft,QString("签字日期:"));

//绘制完毕

deletepPainter;

deletepWriter;

pdfFile.close();

//通过其他PDF阅读器来打开PDF

QDesktopServices::openUrl(QUrl::fromLocalFile(file_path));

}

voidMainWindow::pdfDrawForm(QPainter*paint,inty,inthorzBorder,introw,intcolumn,intunitHeight,QFont&font,QStringList&list)

{

paint->setFont(font);

paint->setPen(QPen(QBrush(QColor(0,0,0)),2));

intWidth=paint->viewport().width()-horzBorder*2;

intunitWidth=Width/column;

for(inti=0;i<row;i++){

intx=horzBorder;

for(intj=0;j<column;j++){

paint->drawText(QRect(x,y,unitWidth,unitHeight),Qt::AlignCenter,list[i*column+j]);

paint->drawRect(QRect(x,y,unitWidth,unitHeight));

x+=unitWidth;

}

y+=unitHeight;

}

-创建PDF文件

voidMainWindow::create_pdf()

{

QPrinterprinter;

QFileDialogfileDialog;

QStringstr=QFileDialog::getSaveFileName(this,tr("SaveText"),"/",tr("TextFiles(*.pdf)"));

printer.setOutputFormat(QPrinter::PdfFormat);

printer.setPageSize(QPrinter::A4);

printer.setOutputFileName(str);

textEdit->print(&printer);

}

-显示PDF文件的打印预览

voidMainWindow::PrintPreview()

{

QPrinterprinter;

QPrintPreviewDialogpreviewDialog(&printer,this);

connect(&previewDialog,SIGNAL(paintRequested(QPrinter*)),this,SLOT(Preview(QPrinter*)));

previewDialog.exec();//打印对话框显示，paintRequest触发

}

voidMainWindow::Preview(QPrinter*printer)

{

textEdit->print(printer);

}

参考资料：

QPrinter方式导出PDF

https://blog.csdn.net/Joker__123/article/details/124154190?spm=1001.2014.3001.5501

QPdfWriter方式导出PDF

https://blog.csdn.net/Joker__123/article/details/124178511?spm=1001.2014.3001.5501

QTextDocument方式导出PDF

https://blog.csdn.net/Joker__123/article/details/124199830

QT将图片、文本、网页生成PDF

https://blog.csdn.net/sunatmine/article/details/110489151

https://blog.csdn.net/xiao123456bin/article/details/114579029

https://www.pianshen.com/article/46371132328/

QT生成复杂的PDF文件

https://blog.csdn.net/yuchunhai321/article/details/120566783

QT实现打印预览及生成Pdf功能

https://martinkeith.blog.csdn.net/article/details/104061822?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_default&utm_relevant_index=2

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