How to accept dynamic inputs in qt -

hi in linux if give command su asks password , if enter right password login's super user,in similar fashion how can through qt application

what classes used,is possible ..?

you can qlineedit class connect signal returnpressed method save first string, change echo mode setechomode() , set qlineedit::password , when user erite second time see write ***** , when press enter can password in same method connected returnpressed signal.

void mainwindow::on_lineedit_returnpressed() {   if (ui->lineedit->echomode() == qlineedit::password) {     _pwd = ui->lineedit->text();     ui->lineedit->setechomode(qlineedit::normal);     // job after getting password here   }   else {     _loggin = ui->lineedit->text();     ui->lineedit->setechomode(qlineedit::password);   } }