How to add variable value in Qt QMessageBox?

Question

printf("This machine calculated all prime numbers under %d %d times in %d 
  seconds\n", MAX_PRIME, NUM_OF_CORES, run_time);

I want this output to be printed in QMessageBox text Box.

I have gone through QMessageBox documentation didn't find anything helpful.

Possible duplicate of Display QMessageBox with multiple arguments — demonplus
– demonplus, Commented Jun 23, 2016 at 6:12

Matteo Italia · Accepted Answer · 2016-06-23 06:52:02Z

4

QMessageBox has nothing for it because it's none of its business - it just displays strings as you passed them. However, QString does provide methods for formatting data replacing placeholders using the arg method:

QMessageBox::information(parent,
     QString("This machine calculated all prime numbers under %1 %2 times in %3 seconds")
         .arg(MAX_PRIME)
         .arg(NUM_OF_CORES)
         .arg(run_time), "Message title");

http://doc.qt.io/qt-5/qstring.html#argument-formats

http://doc.qt.io/qt-5/qstring.html#arg

edited Jun 23, 2016 at 6:52

answered Jun 23, 2016 at 6:13

Matteo Italia

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Kirill Chernikov · Accepted Answer · 2016-06-23 06:15:25Z

1

First of all you must fill QString for you QMessageBox. You can do it with method arg of QString. Then you can show message box with static method information of QMessageBox. In your case code will be:

QMessageBox::information(nullptr/*or parent*/, "Title",  
    QString("This machine calculated all prime numbers under %1 %2 times in %3 seconds")
    .arg(MAX_PRIME).arg(NUM_OF_CORES).arg(run_time));

answered Jun 23, 2016 at 6:15

Kirill Chernikov

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