QtWidget Convert HTML to PDF - c++

Question

The code below is based on this question.
But I still can't get it to work. From basic debugging I think there is something wrong with passing the filenames to the function. There is no reaction at all when I clicked on the "Print as PDF" button.
The main code is as below. If you would like to see further, feel free to ask them from me. Thanks.
Part of main.cpp
QApplication app(argc, argv);
//Get filename for all documents
QString filename = get_filename(Var_STR);
QString txt = txt_filename(filename);
QString csv = csv_filename(filename);
QString html = html_filename(filename);
//Print report in .txt, .csv and .html accordingly
heading(txt, csv, html, Var_STR, Var_INT[6], Var_INT[16], Var_INT[17]);
pp_prerinse(txt, csv, html, Var_INT[18], Var_INT[19], Var_INT[20], Var_INT[21], Var_INT[22], Var_INT[23], Var_INT[24], Var_INT[25], Var_INT[26], Var_REAL[11], Var_INT[30], Var_INT[31], Var_INT[32]);
pp_wash(txt, csv, html, Var_STR, Var_INT[33], Var_INT[34], Var_INT[35], Var_INT[36], Var_INT[37], Var_INT[38], Var_REAL[23], Var_INT[41], Var_INT[42], Var_INT[43], Var_REAL[28], Var_INT[47], Var_INT[48], Var_INT[49], Var_INT[50], Var_INT[51], Var_INT[52], Var_INT[53], Var_INT[54], Var_INT[55], Var_REAL[40]);
pp_rinse(txt, csv, html, Var_INT[59], Var_INT[60], Var_INT[61], Var_INT[62], Var_INT[63], Var_INT[64], Var_INT[65], Var_INT[66], Var_INT[67], Var_INT[68], Var_INT[69], Var_INT[70], Var_INT[71], Var_INT[72], Var_INT[73], Var_INT[74], Var_INT[75], Var_INT[76], Var_INT[77], Var_REAL[61]);
phase_prerinse(txt, csv, html, Var_STR, Var_REAL[64], Var_REAL[67], Var_REAL[70]);
wash(txt, csv, html, Var_STR, Var_REAL[73], Var_REAL[75], Var_REAL[77], Var_REAL[79], Var_REAL[81], Var_REAL[83], Var_REAL[85], Var_REAL[87], Var_REAL[89], Var_REAL[91], Var_REAL[94], Var_REAL[97]);
rinse(txt, csv, html, Var_INT[129], Var_STR);
basin_flush(txt, csv, html, Var_STR);
alarms_code(txt, csv, html, Var_REAL[100], Var_REAL[103], Var_REAL[106]);
tail(txt, csv, html);
//Report preview UI and convert .html to .pdf
QDir htmlpath = QFileInfo(html).absoluteDir();
MainWindow mainWindow((htmlpath.absolutePath())+"/"+html, filename);
mainWindow.setWindowTitle("Print Preview");
mainWindow.showMaximized();
return app.exec();
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QObject>
#include <QMainWindow>
#include <QWebView>
#include <QUrl>
#include <QPushButton>
#include <QString>
#include "windows.h"
#include <algorithm>
#include "qt_windows.h"
#include "qwindowdefs_win.h"
#include <ShellAPI.h>
namespace Ui
{
class MainWindow;
class QPrinter;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QString previewfile = "", QString file = "", QWidget *parent = 0);
virtual ~MainWindow();
public slots:
void buttonPrint(QString filepath);
void buttonCancel();
private:
QWebView *m_pWebView; //Preview of the report layout
QPushButton *m_button; //Print button
QPushButton *n_button; //Cancel button
QString printfile;
QString filepath;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "stdafx.h"
#include "mainwindow.h"
#include <QPrinter>
#include <QTextDocument>
#include <QTextStream>
#include <QFile>
#include <QDir>
MainWindow::MainWindow(QString previewfile, QString file, QWidget *parent)
: QMainWindow(parent)
{
//Open html version of report
m_pWebView = new QWebView(this);
//Set position and size
m_pWebView->setGeometry(0, 0, 1000, 735);
m_pWebView->load(QUrl::fromLocalFile(previewfile));
//Create "print" button
m_button = new QPushButton("Print as PDF", this);
//Set location of button
m_button->setGeometry(QRect(QPoint(1100, 150), QSize(75, 23)));
//Print button action
connect(m_button, SIGNAL(clicked()), this, SLOT(buttonPrint(file)));
n_button = new QPushButton("Cancel", this);
n_button->setGeometry(QRect(QPoint(1100, 179), QSize(75, 23)));
connect(n_button, SIGNAL(clicked()), this, SLOT(buttonCancel()));
}
void MainWindow::buttonPrint(QString filepath)
{
QFile htmlfile(filepath+".html");
if(htmlfile.open(QIODevice::ReadOnly | QIODevice::Text))
{
QString htmlContent;
QTextStream in(&htmlfile);
htmlContent = in.readAll();
QTextDocument *document = new QTextDocument();
document->setHtml(htmlContent);
QPrinter printer(QPrinter::HighResolution);
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setOutputFileName(filepath+".pdf");
document->print(&printer);
delete document;
buttonCancel();
}
}
void MainWindow::buttonCancel()
{
QApplication::quit();
}
MainWindow::~MainWindow()
{
}

Answer 1

I recommend you to porting from QTWebKit to QTWebEngine which use Chromium as native browser, faster and newst. Check for details:
http://doc.qt.io/qt-5/qtwebenginewidgets-qtwebkitportingguide.html
With 5.6, Qt WebKit and Qt Quick 1 will no longer be supported and are dropped from the release. Qt 5.7 integrates printsupport for browser so let's try to use Chromium:
First of all, include:
QT += webengine webenginewidgets printsupport
Now, try something like this:
// Create the webview
QWebEngineView *webView = new QWebEngineView(this);
webView->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
ui->centralWidget->layout()->addWidget(webView);
// Path to the HTML file
const QString filePath = QFileDialog::getOpenFileName(this, "Import HTML", ".", "HTML Files (*.html)");
// Check if the file exist
QFileInfo fileInfo(filePath);
if (!fileInfo.isFile()) {
qDebug() << "Warning, file not found!";
}
// Preview the HTML file
webView->load(QUrl::fromLocalFile(fileInfo.filePath()));
// How to print the page?
// Get the path to the pdf file
const QString pdfPath = QFileDialog::getSaveFileName(this, "Export to pdf", ".", "PDF Files (*.pdf)");
// Print the page in pdf format
webView->page()->printToPdf(pdfPath);