cannot call constructor 'Qstring::Qstring' directly

[rawfool]

Please embed your code between [CODE ] [/ CODE] tags

As I see, your syntax is wrong.
You have to invoke the constructor of QString as

QString("%1%2").arg(x_cord).arg(y_cord)

QString("%1%2").arg(x_cord).arg(y_cord)

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And you can't setText() to QHash item.