I have the following function.

Qt Code: 
  1. void haal::authenticate()
  2. {
  3.     remoteDB();
  4.     QSqlQuery query("SELECT * FROM princess");
  5.     int ttwo = query.record().indexOf("two");
  6.     int tthree = query.record().indexOf("three");
  7.     int ffour = query.record().indexOf("four");
  8.     int ffive = query.record().indexOf("five");
  9.     int ssix = query.record().indexOf("six");
  10.     int sseven = query.record().indexOf("seven");
  11.     int eeight = query.record().indexOf("eight");
  12.     while (query.next()) {
  13.         QString aa = query.value(ttwo).toString();
  14.         QString bb = query.value(tthree).toString();
  15.         QString cc = query.value(ffour).toString();
  16.         QString dd = query.value(ffive).toString();
  17.         QString ee = query.value(ssix).toString();
  18.         QString ff = query.value(sseven).toString();
  19.         QString gg = query.value(eeight).toString();
  20.  
  21.         if(aa != ui.validator->text())
  22.         {
  23.             QMessageBox msgBox;
  24.             msgBox.setText("That Key Is Not Valid.");
  25.             QPushButton *connectButton = msgBox.addButton(tr("Ok"), QMessageBox::AcceptRole);
  26.             msgBox.exec();
  27.  
  28.             if (msgBox.clickedButton() == connectButton)
  29.             {
  30.                 //close();//exit the application
  31.                 //qApp->exit(0);...stop further processing;exit the application
  32.                //how should it be done..
  33.             }
  34.         }
  35.         if(aa == ui.validator->text())
  36.         {
  37.             if (msgBox.clickedButton() == connectButton)
  38.             {
  39.             QMessageBox msgBox;
  40.             msgBox.setText("That Key Is Valid.");
  41.             }
  42.  
  43.             QString kaad = getID();
  44.             QSqlQuery query;
  45.             query.prepare("INSERT INTO princess (one,two,three,four,five,six,seven) "
  46.                           "VALUES (:one, :two, :three,:four,:five,:six,:seven)");
  47.             query.bindValue(":one", 78);
  48.             query.bindValue(":two", 7843251);
  49.             query.bindValue(":three",79);
  50.             query.bindValue(":four",80);
  51.             query.bindValue(":five",81);
  52.             query.bindValue(":six", 82);
  53.             query.bindValue(":seven",kaad);
  54.             query.exec();
  55.  
  56.         }
  57.     }
  58.  
  59. }
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I need to stop the processing here:

Qt Code: 
  1. if (msgBox.clickedButton() == connectButton)
  2.             {
  3.                 //close();//exit the application
  4.                 //qApp->exit(0);...stop further processing;exit the application
  5.                //nothing to be executed below this line
  6.             }
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