Hi, I have a problem. I want to save my items from tableWidget to Xml file, and load them into a table with xml.

Qt Code: 
  1. void MainWindow::AddItemsToTable()
  2. {
  3.     CheckAddingEmptyValue();
  4.  
  5.     int row = ui->tableWidget->rowCount();
  6.     ui->tableWidget->insertRow(row);
  7.  
  8.     for(int i = 0; i < ui->tableWidget->columnCount(); ++i)
  9.         ui->tableWidget->setItem(row, i, new QTableWidgetItem(""));
  10.  
  11.     Q_ASSERT(ui->tableWidget->item(row, 0));
  12.     ui->tableWidget->item(row, 0)->setText(ui->lineEdit_3->text());
  13.  
  14.     Q_ASSERT(ui->tableWidget->item(row, 1));
  15.     ui->tableWidget->item(row, 1)->setText(ui->lineEdit_2->text());
  16.  
  17.     Q_ASSERT(ui->tableWidget->item(row, 2));
  18.     ui->tableWidget->item(row, 2)->setText(ui->lineEdit->text());
  19. }
  20.  
  21. void MainWindow::SaveDataToXml()
  22. {
  23.     QFile file("Data.xml");
  24.     if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
  25.     {
  26.        QMessageBox msgBox;
  27.        msgBox.setWindowTitle("Error");
  28.        msgBox.setIcon(QMessageBox::Warning);
  29.        msgBox.setInformativeText(trUtf8("Cannot write file !"));
  30.        msgBox.setStandardButtons(QMessageBox::Ok);
  31.     }
  32.  
  33.     QXmlStreamWriter xmlWriter(&file);
  34.     xmlWriter.setAutoFormatting(true);
  35.     xmlWriter.writeStartDocument("1.0");
  36.  
  37. //?????????????????????????????????//
  38. // Code that write table data to xml///
  39. //////////////////////////////////////////
  40. /////////////////////////////////////////
  41. ////////////////////////////////////////
  42.  
  43.     }
  44.     xmlWriter.writeEndDocument();
  45.  
  46.     file.close();
  47.     if (file.error())
  48.     {
  49.        QMessageBox msgBox;
  50.        msgBox.setWindowTitle("Error");
  51.        msgBox.setIcon(QMessageBox::Warning);
  52.        msgBox.setInformativeText(trUtf8("Cannot write file !"));
  53.        msgBox.setStandardButtons(QMessageBox::Ok);
  54.     }
  55. }
  56.  
  57.  
  58. void MainForm::ReadDataFromXml()
  59. {
  60.     QFile file("Data.xml");
  61.     if (!file.open(QFile::ReadOnly | QFile::Text))
  62.     {
  63.        QMessageBox msgBox;
  64.        msgBox.setWindowTitle("Error");
  65.        msgBox.setIcon(QMessageBox::Warning);
  66.        msgBox.setInformativeText(trUtf8("Cannot open database file !"));
  67.        msgBox.setStandardButtons(QMessageBox::Ok);
  68.     }
  69.  
  70. //?????????????????????????????????//
  71. // Code that read xml and add data do Table///
  72. //////////////////////////////////////////
  73. /////////////////////////////////////////
  74. ////////////////////////////////////////
  75.  
  76.       file.close();
  77.       if (file.error() != QFile::NoError)
  78.       {
  79.          QMessageBox msgBox;
  80.          msgBox.setWindowTitle("Error");
  81.          msgBox.setIcon(QMessageBox::Warning);
  82.          msgBox.setInformativeText(trUtf8("Cannot read database file !"));
  83.          msgBox.setStandardButtons(QMessageBox::Ok);
  84.       }
  85. }
  86.  
  87. void MainForm::on_pushButton_clicked()
  88. {
  89.     AddItemsToTable();
  90.     SaveDataToXml();
  91. }
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I need help
Regards