Qt get part of QString

Question

I want to get QString from another QString  when I know necessary indexes  For example  Main string   This is a string   I want to create new QString from first 5 symbols and get  This    input   first and last char number  output   new QString   How to create it      P S  Not only first several letters  also from the middle of the line  for example from 5 till 8

User · Answer

Use the left function   QString yourString    This is a string   QString leftSide   yourString left 5   qDebug    lt  lt  leftSide     output  This     Also have a look at mid   if you want more control

User · Answer

If you do not need to modify the substring  then you can use QStringRef   The QStringRef class is a read only wrapper around an existing QString that references a substring within the existing string   This gives much better performance than creating a new QString object to contain the sub-string  E g   QString myString  This is a string    QStringRef subString  amp myString  5  2      subString contains  is    If you do need to modify the substring  then left    mid   and right   will do what you need     QString myString  This is a string    QString subString   myString mid 5 2      subString contains  is  subString append  n t       subString contains  isn t

[qt] Qt. get part of QString

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