SORRY ,here is my code

Qt Code: 
  1. costructor
  2.   {
  3.     proc = new QProcess();
  4.     proc->start( "tclsh" );
  5.  
  6.     textEdit->addAction( actionClear_All );
  7.     // connects
  8.     connect( proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( captureProcessOutput() ));
  9.     connect( proc, SIGNAL( readyReadStandardError() ), this, SLOT( captureProcessError() ));
  10.  
  11.     connect( lineEdit, SIGNAL( returnPressed() ), this, SLOT( lineEditReturnPressed() ) );
  12.     connect( proc, SIGNAL( finished( int, QProcess::ExitStatus) ), this, SLOT( processFinished(int,QProcess::ExitStatus ) ));
  13.  
  14. } 
  15. void MainWindow::lineEditReturnPressed()
  16.    {
  17.     proc->write( qPrintable( lineEdit->text()+'\n' ) );
  18.   }
  19.  
  20.  void MainWindow::captureProcessOutput()
  21.    {
  22.     textEdit->append( proc->readAllStandardOutput() );
  23.   }
  24.  void MainWindow::captureProcessError()
  25.  {
  26.    textEdit->append( proc->readAllStandardError() );
  27.   }
  28.   void MainWindow::processFinished( int exitCode, QProcess::ExitStatus )
  29.   {    Q_UNUSED( exitCode );
  30.     qApp->quit();
  31.   }
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