Storing QTextCharFormat and QColor to text file?

lansing

I want a setting that allows users to import/export font setting and color from a setting file (text file). How do I convert them into string for storing? For QColor I think I can convert it to hex but I have no idea for QTextCharFormat ,

jsulm

@lansing You can implement

QTextStream &	operator<<(const QTextCharFormat&)
QTextStream &	operator>>(QTextCharFormat&)

and serialise/de-serialise what ever QTextCharFormat properties you want.
See https://doc.qt.io/qt-5/qtextstream.html

lansing

@jsulm

Can you give an example on how to read with that syntax? I'm getting the error overloaded 'operator>>' must be a binary operator .

jsulm

@lansing There are examples in the link I posted.

// I assume stream is a QTextStream here
QTextCharFormat charFormat;
stream >> charFormat;

lansing

@jsulm

This is my test to write to a text file:

    QTextCharFormat  textCharFormat; // this has value inside

    QFile data("output.txt");
    if (data.open(QFile::WriteOnly | QFile::Truncate)) {
        QTextStream out(&data);            
        out << textCharFormat;
    }

I got an error invalid operands to binary expression ('QTextStream' to 'QTextCharFormat').

jsulm

@lansing That's why I wrote before:
You can implement

QTextStream & operator<<(const QTextCharFormat&)
QTextStream & operator>>(QTextCharFormat&)

You have to implement those operators first.

lansing

@jsulm said in Storing QTextCharFormat and QColor to text file?:

QTextStream & operator<<(const QTextCharFormat&)

Hi, I have searched around how to write overloaded function for the operator, but I have not seen any example on the syntax you're using.

I have declared QTextStream & operator<<(const QTextCharFormat&) in the class' header file, and in the source file, it should be something like this?

QTextStream &SettingsDialog::operator<<(const QTextCharFormat &b)
{
    stream << "font: " << b.font().toString() << " font-family: " << b.fontFamily();
    return stream;
}

But I don't know where do I pass in the stream in the implementation.