I want to be able to print a QList to a TextBox with setText(“ “), but I need to convert that list to a string. This may be trivial, but I’m new to cpp and Qt. essentially I want to do the following:
{1,2,3,4} -> “{1,2,3,4}” 
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2 Answers
Improving a bit on the answer by JarMan. This should be more performant and more Qt-ish.
// Assuming QList of integers QString list2String(const QList<int> &list) { QStringList strings; strings.reserve(list.size()); for (int i : list) { strings.append(QString::number(i)); } return QStringLiteral("{%1}").arg(strings.join(',')); } answered Jun 21, 2022 at 20:09
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QList is just a container. It doesn't know anything about strings. So you'll need to iterate over the list and append each value into the string.
// Assuming QList of integers QString list2String(const QList<int> &list) { QString s = "{"; for (auto &value : list) { s += QString("%1,").arg(value); } // Chop off the last comma s.chop(1); s += "}"; return s; } 