Read cell value have formula

[shenxingui]

Hello, if cell have formula how to get cell value (not return formula) use Qxln！

sample code:
xlsn::path file = xlsn::path("text.xlsx");
xlsn::workbook wb(file);

auto ws = wb.sheet_by_title("Total");
auto cell = ws.cell(1,3);
qDebug() << "val is " <<QString::fromStdString(cell.valuestd::string());

but return value is SUM(A1:A2)，not number string value

thank very much!