How to parse escape sequences in QString?

Question

I have a QString that I need to insert it to a QJsonArray. The problem is that the string is inserrted as it is and the escape sequences doesnot work.

    QString fmt = QString("{\n \"%1\":\"%2\"\n}").arg(id,name);
    QJsonValue qjv(fmt);
    labellist.insert(lSize, qjv);

Here, the qstring is populated with the values from "id" and "name" (these are also QString) and then inserted to qjsonarray. The labellist here is a QJsonArray. The inputs to the QString are say for example "55" and "ggg". When I print the qstring like

    qDebug().noquote() << fmt;

it gives me

    {
     "55":"ggg"
    }

but if I insert it to the labellist and print the labellist it gives:

    QJsonArray([{"121":"fuu"},{"122":"cat"},{"123":"dog"},"{\n \"55\":\"ggg\"\n}"])

The format of the QJsonvalues in the above array is lost.

How to decode the string to preserve the format and make the escape sequences work?

Why do you insert formatting characters? You don't need to do that. That's why `QJson*` classes are for. They do it for you. — vahancho, Nov 03 '17 at 07:58

score 1 · Accepted Answer · answered Nov 02 '17 at 18:49

I would use QJsonDocument static method fromJson(), like this:

  QString fmt = QString("{\n \"%1\":\"%2\"\n}").arg("id","name");

  QJsonDocument doc = QJsonDocument::fromJson(fmt.toLocal8Bit());
  QJsonObject obj = doc.object();

  QJsonArray array;
  array.append(obj);

  qDebug() << array;

How to parse escape sequences in QString?

1 Answers1