Russian Qt Forum

  QTreeWidgetItem *locwi;
  bool same[] = {false, true, true, true, true, true, true, true};
  for (int i = 0; i < filModel->rowCount(*mi); i++)
  {
    if ((filModel->fileInfo(mi->child(i,0)).isDir()) && (filModel->rowCount(mi->child(i,0)) > 0))
    {
      locwi = new QTreeWidgetItem(wi);
      locwi->setText( 0, filModel->fileName(mi->child( i, 0 )));
      locwi->setIcon( 0, filModel->fileIcon(mi->child( i, 0 )));
      locwi->setText( 8, filModel->filePath(mi->child( i, 0 )));
      locwi->setText( 9, "Folder");
      LookUp(&mi->child(i, 0), locwi);
      
    }
    
    if (filModel->fileInfo( mi->child( i, 0 )).isFile())
    {
      TagLib::FileRef fl(filModel->filePath( mi->child( i, 0) ).toAscii().data());

      locwi = new QTreeWidgetItem(wi);
      locwi->setText( 0, filModel->fileName( mi->child( i, 0) ));
      locwi->setIcon( 0, filModel->fileIcon( mi->child( i, 0) ));
      locwi->setText( 8, filModel->filePath( mi->child( i, 0) ));
      locwi->setText( 9, "File");
      locwi->setText( 1, QString::fromStdWString(fl.tag()->artist().toWString()));
      locwi->setText( 2, QString::fromStdWString(fl.tag()->title().toWString()));
      locwi->setText( 3, QString::fromStdWString(fl.tag()->album().toWString()));
      locwi->setText( 4, QString::number(fl.tag()->year()));
      locwi->setText( 5, QString::number(fl.tag()->track()));
      locwi->setText( 6, QString::fromStdWString(fl.tag()->genre().toWString()));
      locwi->setText( 7, QString::fromStdWString(fl.tag()->comment().toWString()));
      
      emit incProgVal();
      
    }
    
    for (int j = 1; j <= 8; j++)
      if ( (same[j]) && (i > 0) )
        if (wi->child(i - 1) != NULL)
          if (locwi->text(j) != wi->child(i - 1)->text(j))
            same[j] = false;
    
    if (cancel)
    {
      return;
    }
    //QApplication::processEvents();
  }
  
  for (int j = 1; j <= 8 ; j++)
    if (same[j])
      if (wi->child(0) != NULL)
        wi->setText(j, wi->child(0)->text(j));

QObject Reentrancy
...Although QObject is reentrant, the GUI classes, notably QWidget and all its subclasses, are not reentrant. 
They can only be used from the main thread. As noted earlier, 
QCoreApplication::exec() must also be called from that thread...