Delay between characters write to serial port

Hi,

I want to send printable ascii characters from 32 to 126 (converted to string) to the serial port with a delay between each character. when start button is pressed the SendHandle () function is called. I want to send the ascii characters continuously with delay between each character. I have written a code as below but it hangs when i click the start button. Please help me in this regard.

void Widget::SendHandle ()
{
if(start==1)
{
for(i=32;i<=126;i++)
{

      QString str1= QChar(i);
      asc =str1.toUtf8();
     Sleeper::msleep(delay);

    serial->write(asc); //writing data to serial port

    ui->display->moveCursor (QTextCursor::End);
    ui->display->insertPlainText (asc);
    ui->display->moveCursor (QTextCursor::End);

  ui->bitslcd->display(nchar);
  nchar++;

}

}
}

kqt-mr-nv6

if you sleep in the GUI code
complete event engine is not called
so the GUI freezes
you can implement code by using signals & slots

or

you can call event engine using
QCoreApplication::processEvents
to process the events

Thank you so much. QCoreApplication::processEvents(); worked ....