i have to control a QLineEdit input a runtime, 'cause i need to check the character typed by the user...i set a validator in this way:
Qt Code: 
  1. QRegExp _regexp ( "control input" );
  2. _lineEdit->setValidator ( new QRegExpValidator ( _regexp , this ) );
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so i can't do it in the way that u suggested before, maybe i have not been clear enough during in my problem explanation