How to read number from file(casting- the numbers has readen as string)- c++ qt

[RuWex]

Let's say I want to read this file:
///
readLine25
goToLine1
....
///
now,
How can I treat int as int? and the string as string?
I want to get the number,
for example in line 1 I want to get 25
an important note.
the string allways 8 chars- not less not more!
thanks:)

[jsulm]

@RuWex said in How to read number from file(casting- the numbers has readen as string)- c++ qt:

How can I treat int as int?

https://doc.qt.io/qt-6/qstring.html#toInt

To get the number string simply use https://doc.qt.io/qt-6/qstring.html#sliced

So, first call https://doc.qt.io/qt-6/qstring.html#sliced to get the part of the string which contains the int and then convert that string to int using https://doc.qt.io/qt-6/qstring.html#toInt

[JonB]

@jsulm
OoI, why did Qt6 QString feel the need to introduce sliced() when we have had mid() for years?
EDIT Oh, mid() docs now say

If you know that position and n cannot be out of bounds, use sliced() instead in new code, because it is faster.