Try something like this:

Qt Code: 
  1. void MainWindow::saveFile(const QString &fileName)
  2. {
  3.  
  4. 	QFile file( fileName );
  5. 	if ( !file.open(QFile::WriteOnly))
  6. 	  return;
  7.  
  8. 	QTextStream out( &file );
  9.  
  10. 	int ind = 0;
  11. 	while(QTreeWidgetItem *item = contactView->topLevelItem(ind))  {
  12. 		for ( unsigned int i = 0; i < 4; i++ )  
  13. 			out << item->text(i) << '\t';  
  14. 		out << '\n';
  15.  
  16. 	ind ++;
  17. 	}
  18. 	file.close();
  19.  
  20. }
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