How to format a QString

Question

I d like to format a string for Qt label  I m programming in C   on Qt   In ObjC I would write something like    NSString  format  NSString stringWithFormat           How to do something like that in Qt

User · Answer

Use QString  arg   for the same effect

User · Answer

You can use the sprintf method  however the arg method is preferred as it supports unicode   QString str  str sprintf   s  d    string   213

User · Answer

You can use QString arg like this  QString my formatted string   QString   1  2- 3 txt   arg       Tom    Jane       You get    Tom-Jane txt    This method is preferred over sprintf because   Changing the position of the string without having to change the ordering of substitution  e g      To get    Jane-Tom txt  QString my formatted string   QString   1  3- 2 txt   arg       Tom    Jane      Or  changing the type of the arguments doesn t require changing the format string  e g      To get    Tom-1 txt  QString my formatted string   QString   1  2- 3 txt   arg       Tom   QString  number 1      As you can see  the change is minimal  Of course  you generally do not need to care about the type that is passed into QString  arg   since most types are correctly overloaded   One drawback though  QString  arg   doesn t handle std  string  You will need to call  QString  fromStdString   on your std  string to make it into a QString before passing it to QString  arg    Try to separate the classes that use QString from the classes that use std  string  Or if you can  switch to QString altogether   UPDATE  Examples are updated thanks to Frank Osterfeld   UPDATE  Examples are updated thanks to alexisdm

[c++] How to format a QString?

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