How to convert QVariant to HTML

[SGaist]

Hi,

What is in your QVariant ?

[VRonin]

It's not exahustive but it's a start (source):

QString saveVariant(const QVariant& val)
{
    if (val.isNull())
        return QString();
    switch (val.type()) {
    case QMetaType::UnknownType:
        Q_ASSERT_X(false, "saveVariant", "Trying to save unregistered type.");
        return QString();
    case QMetaType::Bool: return val.toBool() ? QStringLiteral("1") : QStringLiteral("0");
    case QMetaType::Long:
    case QMetaType::Short:
    case QMetaType::Char:
    case QMetaType::SChar:
    case QMetaType::Int: return QString::number(val.toInt());
    case QMetaType::ULong:
    case QMetaType::UShort:
    case QMetaType::UChar:
    case QMetaType::UInt: return QString::number(val.toUInt());
    case QMetaType::LongLong: return QString::number(val.toLongLong());
    case QMetaType::ULongLong:  return QString::number(val.toULongLong());
    case QMetaType::Double:  
    case QMetaType::Float: return guessDecimalsString(val.toDouble());
    case QMetaType::QChar: return QString(val.toChar());
    case QMetaType::QString: return val.toString();
    case QMetaType::QByteArray: return QString::fromLatin1(val.toByteArray().toBase64());
    case QMetaType::QDate: return val.toDate().toString(Qt::ISODate);
    case QMetaType::QTime: return val.toTime().toString(Qt::ISODate);
    case QMetaType::QDateTime: return val.toDateTime().toString(Qt::ISODate);
    case QMetaType::QImage: return saveImageVariant(val.value<QImage>());
    case QMetaType::QPixmap: return saveImageVariant(val.value<QPixmap>().toImage());
    case QMetaType::QBitmap: return saveImageVariant(val.value<QBitmap>().toImage());
    default:
        return variantToString(val);
    }
}
QString saveImageVariant(const QImage& imageData)
{
    QByteArray byteArray;
    QBuffer buffer(&byteArray);
    imageData.save(&buffer, "PNG");
    return QString::fromLatin1(byteArray.toBase64().constData());
}
QString variantToString(const QVariant& val)
{
    QString result;
    QByteArray data;
    QDataStream outStream(&data, QIODevice::WriteOnly);
    outStream << val;
    data = qCompress(data);
    return QString::fromLatin1(data.toBase64());
}
void writeHtmlVariant(QXmlStreamWriter& writer, const QVariant& val)
{
    if (isImageType(val.type())) {
        writer.writeEmptyElement(QStringLiteral("img"));
        writer.writeAttribute(QStringLiteral("src"), "data:image/png;base64," + saveVariant(val));
        writer.writeAttribute(QStringLiteral("alt"), QStringLiteral("modelimage.png"));
        return;
    }
    writer.writeCharacters(saveVariant(val));
}
bool isImageType(int val) {
    switch(val){
    case QMetaType::QImage:
    case QMetaType::QPixmap:
    case QMetaType::QBitmap:
        return true;
    }
    return false;
}

[Mikeeeeee]

@SGaist In QVariant text and images from .docx file.

[Mikeeeeee]

@VRonin it doesn't compile

[jsulm]

@Mikeeeeee said in How to convert QVariant to HTML:

it doesn't compile

Then fix the issues in the code or at least post the compiler errors...

[Mikeeeeee]

Too many errors, not enough files

[VRonin]

@Mikeeeeee said in How to convert QVariant to HTML:

Too many errors

Fixed and turned into a working minimal example:

#include <QGuiApplication>
#include <QDataStream>
#include <QMetaType>
#include <QXmlStreamWriter>
#include <QBuffer>
#include <QImage>
#include <QBitmap>
#include <QPixmap>
#include <QVariant>
#include <QDateTime>
#include <QFile>

int guessDecimals(double val)
{
    int precision = 0;
    for (double junk = 0; !qFuzzyIsNull(std::modf(val, &junk)); ++precision)
        val *= 10.0;
    return precision;
}
QString guessDecimalsString(double val, QLocale* loca  = Q_NULLPTR)
{
    if (loca)
        return loca->toString(val, 'f', guessDecimals(val));
    return QString::number(val, 'f', guessDecimals(val));
}
bool isImageType(int val) {
    switch(val){
    case QMetaType::QImage:
    case QMetaType::QPixmap:
    case QMetaType::QBitmap:
        return true;
    }
    return false;
}
QString saveImageVariant(const QImage& imageData)
{
    QByteArray byteArray;
    QBuffer buffer(&byteArray);
    imageData.save(&buffer, "PNG");
    return QString::fromLatin1(byteArray.toBase64().constData());
}
QString variantToString(const QVariant& val)
{
    QString result;
    QByteArray data;
    QDataStream outStream(&data, QIODevice::WriteOnly);
    outStream << val;
    data = qCompress(data);
    return QString::fromLatin1(data.toBase64());
}

QString saveVariant(const QVariant& val)
{
    if (val.isNull())
        return QString();
    switch (val.type()) {
    case QMetaType::UnknownType:
        Q_ASSERT_X(false, "saveVariant", "Trying to save unregistered type.");
        return QString();
    case QMetaType::Bool: return val.toBool() ? QStringLiteral("1") : QStringLiteral("0");
    case QMetaType::Long:
    case QMetaType::Short:
    case QMetaType::Char:
    case QMetaType::SChar:
    case QMetaType::Int: return QString::number(val.toInt());
    case QMetaType::ULong:
    case QMetaType::UShort:
    case QMetaType::UChar:
    case QMetaType::UInt: return QString::number(val.toUInt());
    case QMetaType::LongLong: return QString::number(val.toLongLong());
    case QMetaType::ULongLong:  return QString::number(val.toULongLong());
    case QMetaType::Double:
    case QMetaType::Float: return guessDecimalsString(val.toDouble());
    case QMetaType::QChar: return QString(val.toChar());
    case QMetaType::QString: return val.toString();
    case QMetaType::QByteArray: return QString::fromLatin1(val.toByteArray().toBase64());
    case QMetaType::QDate: return val.toDate().toString(Qt::ISODate);
    case QMetaType::QTime: return val.toTime().toString(Qt::ISODate);
    case QMetaType::QDateTime: return val.toDateTime().toString(Qt::ISODate);
    case QMetaType::QImage: return saveImageVariant(val.value<QImage>());
    case QMetaType::QPixmap: return saveImageVariant(val.value<QPixmap>().toImage());
    case QMetaType::QBitmap: return saveImageVariant(val.value<QBitmap>().toImage());
    default:
        return variantToString(val);
    }
}
void writeHtmlVariant(QXmlStreamWriter& writer, const QVariant& val)
{
    if (isImageType(val.type())) {
        writer.writeEmptyElement(QStringLiteral("img"));
        writer.writeAttribute(QStringLiteral("src"), "data:image/png;base64," + saveVariant(val));
        writer.writeAttribute(QStringLiteral("alt"), QStringLiteral("modelimage.png"));
        return;
    }
    writer.writeCharacters(saveVariant(val));
}


int main(int argc, char **argv) {
    QGuiApplication app(argc,argv);
    QFile htmlOutPut("TestOutput.html");
    if(!htmlOutPut.open(QIODevice::WriteOnly))
        return 1;
    htmlOutPut.write(QByteArrayLiteral("<!DOCTYPE html>"));
    QXmlStreamWriter htmlWriter(&htmlOutPut);
    htmlWriter.writeStartElement(QStringLiteral("html"));
    htmlWriter.writeAttribute(QStringLiteral("xmlns"),QStringLiteral("http://www.w3.org/1999/xhtml"));
    htmlWriter.writeAttribute(QStringLiteral("lang"),QStringLiteral("en"));
    htmlWriter.writeAttribute(QStringLiteral("xml:lang"),QStringLiteral("en"));
    htmlWriter.writeStartElement(QStringLiteral("head"));
    htmlWriter.writeEmptyElement(QStringLiteral("meta"));
    htmlWriter.writeAttribute(QStringLiteral("http-equiv"),QStringLiteral("Content-Type"));
    htmlWriter.writeAttribute(QStringLiteral("content"),QStringLiteral("text/html; charset=utf-8"));
    htmlWriter.writeStartElement(QStringLiteral("title"));
    htmlWriter.writeCharacters(QStringLiteral("Testing Variant to Html"));
    htmlWriter.writeEndElement(); //title
    htmlWriter.writeEndElement(); //head
    htmlWriter.writeStartElement(QStringLiteral("body"));
    htmlWriter.writeStartElement(QStringLiteral("p"));
    writeHtmlVariant(htmlWriter, QStringLiteral("The magic number is: "));
    writeHtmlVariant(htmlWriter, 88);
    writeHtmlVariant(htmlWriter, QStringLiteral(" and "));
    writeHtmlVariant(htmlWriter, 3.21);
    htmlWriter.writeEndElement(); //p
    QPixmap blueImage(200,200);
    blueImage.fill(Qt::blue);
    writeHtmlVariant(htmlWriter,blueImage);
    htmlWriter.writeEndDocument();
    return 0;
}

In QVariant text and images from .docx file.

What does this mean?

[Mikeeeeee]

Excuse me.
This is compiled.
But if I do this:

HTMLString = ConvertDocInHTML::saveVariant(HTMLQVariant);

ing an error:
D:\QTProject\ReaderResume\mainwindow.cpp:1198: ошибка: cannot call member function 'QString ConvertDocInHTML::saveVariant(const QVariant&)' without object
HTMLResume = ConvertDocInHTML::saveVariant(HTMLQVariant);
^

[VRonin]

put a static in front of the method declaration

[Mikeeeeee]

this method returns plain text, not HTML

[mrjj]

@Mikeeeeee
hi
But html is plain text.
like

<html><head/><body><p><span style=" font-size:8.25pt; font-weight:600;">THIS IS HTML</span></p></body></html>

I think you need to explain better what you have in the QVariant and what you wish to convert it to.

[fcarney]

Sarcastic response:

QString getHTML(){
  return QString("HTML");
}

Seriously, what html do you need? The full document, an excerpt? Conversion of one document to another? A really naive approach could be:

QString getHTML(QVariant data){
  return QString("<div>"+data.toString()+"</div>");
}

This returns a valid HTML string that is wrapped by an HTML tag. Not a full document, but usable in a larger document producing construct.

[Mikeeeeee]

I have .docx file.
I get simple text from .docx:

QString ResumeFileName ("");
    ResumeFileName = QFileDialog::getOpenFileName(0, "Text ", "", "*.doc *.docx *.rtf");
    ResumeFileName.replace(QRegExp("[/]"), "\\");
    qDebug()<<ResumeFileName;
    if (ResumeFileName != "")
    {
        QAxObject   wordApplication("Word.Application");
        QAxObject *documents = wordApplication.querySubObject("Documents");
        QAxObject *document = documents->querySubObject("Open(const QString&, bool)", ResumeFileName, true);
        QAxObject *words = document->querySubObject("Words");
        QString TextResume;
        QString HTMLResume;
        int countWord = words->dynamicCall("Count()").toInt();
        for (int a = 1; a <= countWord; a++){
            TextResume.append(words->querySubObject("Item(int)", a)->dynamicCall("Text()").toString());
            HTMLResume.append(words->querySubObject("Item(int)", a)->dynamicCall("Text()").SomethingFfunction);
        }
        document->dynamicCall("Close (boolean)", false);
        TextResume.replace(QRegExp("[\r]"), "\r\n"); 
        qDebug()<<TextResume;

But I also need text with formatting and pictures