Remove a line in a text file

[jaca]

How to remove a line from a file?

void DeslocaPt::skip(QStringList &l, QStringList &p)
{
    QString arqAlt = altEdit->text();
    QString line, linesimp;
    QFile file(arqAlt);
    if(file.open(QIODevice::ReadWrite | QIODevice::Text)){
        QTextStream out(&file);
        while(!out.atEnd()){
            line = out.readLine();
            linesimp = line.simplified();
            for (int i = 0; i < l.size(); ++i)
                if (linesimp.contains(QString("S%1 %2").arg(l.at(i)).arg(p.at(i)))){
                    line.clear();
                }
 
            out << line << endl;
        }
    }
    file.close();
}

void DeslocaPt::skip(QStringList &l, QStringList &p)
{
    QString arqAlt = altEdit->text();
    QString line, linesimp;
    QFile file(arqAlt);
    if(file.open(QIODevice::ReadWrite | QIODevice::Text)){
        QTextStream out(&file);
        while(!out.atEnd()){
            line = out.readLine();
            linesimp = line.simplified();
            for (int i = 0; i < l.size(); ++i)
                if (linesimp.contains(QString("S%1 %2").arg(l.at(i)).arg(p.at(i)))){
                    line.clear();
                }

            out << line << endl;
        }
    }
    file.close();
}

To copy to clipboard, switch view to plain text mode 

I tried to do:

line.clear();
out << line << endl;

line.clear();
out << line << endl;

To copy to clipboard, switch view to plain text mode 

I used this command to position

out.seek(out.pos() - line.size() );

out.seek(out.pos() - line.size() );

To copy to clipboard, switch view to plain text mode 

result is not satisfactory. Any idea?

[jaca]

I think there is not a quicker solution to delete a row in a given file. The solution was to add two QFile, one for ReadOnly and another to WriteOnly.