busy progress bar without thread ?

[bmn]

ui.initStatus->setMaximum(0);
ui.initStatus->setMinimum(0);
this->timer = new QTimer(this);
connect(this->timer, SIGNAL(timeout()), this, SLOT(advanceProgressBar()));
this->timer->start(100);
 
void advanceProgressBar(){
    qApp->processEvents();
}

ui.initStatus->setMaximum(0);
ui.initStatus->setMinimum(0);
this->timer = new QTimer(this);
connect(this->timer, SIGNAL(timeout()), this, SLOT(advanceProgressBar()));
this->timer->start(100);

void advanceProgressBar(){
    qApp->processEvents();
}

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Don't work

how...
thanks!!