Hi all

I have following code

Qt Code: 
  1. QStringList objectName_list;
  2.     objectName_list<<"label_master_ac"<<"label_living_ac"<<"label_dining_ac"<<"label_bathroom_geyser"<<"label_entertainment"
  3. 		  <<"label_heater";
  4.  
  5.     QFile *file = new QFile("E:/label_with_xml_file/labelname.xml");
  6.     if (!file->open(QFile::ReadOnly | QFile::Text)) {
  7. 	QMessageBox::warning(this, tr("Error: Cannot read file"),tr(qPrintable(file->errorString())));
  8.     }
  10.     doc.setContent(file);
  11.     QDomElement root = doc.documentElement();
  12.     QDomNode node = root.firstChild();
  13.     i=0;
  14.     while(!node.isNull())
  15.     {
  16. 	if(node.toElement().tagName() == "label"){
  17. 	    if(node.toElement().attribute("objectName") != "label_master_ac" &&
  18. 		  node.toElement().attribute("objectName") != "label_living_ac" &&
  19. 		  node.toElement().attribute("objectName") != "label_dining_ac" &&
  20. 		  node.toElement().attribute("objectName") != "label_bathroom_geyser"
  21. 		  && node.toElement().attribute("objectName") != "label_entertainment"
  22. 		  && node.toElement().attribute("objectName") != "label_heater"){
  23.  
  24. 		qDebug()<<"while"<<node.toElement().attribute("objectName");
  25. 		node = node.nextSibling();
  26. 		continue;
  27. 	    }
  28. 	    qDebug()<<QString::number(i);
  29. 	    QLabel *label = new QLabel(this);
  30. 	    QFont font("Verdana", 10);
  31. 	    font.setBold(true);
  32. 	    label->setFont(font);
  33. 	    label->setAlignment(Qt::AlignCenter);
  34. 	    label->setFixedHeight(screenHeight/35);
  35. 	    label->setStyleSheet("QLabel { background-color: rgb(240, 240, 240,255); color: rgb(131, 64, 0, 255);}");
  36. 	    label->setObjectName(objectName_list.at(i));
  37. 	    qDebug()<< node.toElement().attribute("objectName");
  38. 	    if(objectName_list.at(i) == "label_master_ac"  && node.toElement().attribute("objectName") == "label_master_ac"){
  39. 		label->setText(node.toElement().text());
  40. 		grid->addWidget(label, 0,1);
  41. 	    }
  42. 	    if(objectName_list.at(i) == "label_living_ac"  && node.toElement().attribute("objectName") == "label_living_ac"){
  43. 		label->setText(node.toElement().text());
  44. 		grid->addWidget(label, 0,2);
  45. 	    }
  46. 	    if(objectName_list.at(i) == "label_dining_ac"  && node.toElement().attribute("objectName") == "label_dining_ac"){
  47. 		label->setText(node.toElement().text());
  48. 		grid->addWidget(label, 0,3);
  49. 	    }
  50. 	    if(objectName_list.at(i) == "label_bathroom_geyser"  && node.toElement().attribute("objectName") == "label_bathroom_geyser"){
  51. 		label->setText(node.toElement().text());
  52. 		grid->addWidget(label, 4, 1);
  53. 	    }
  54. 	    if(objectName_list.at(i) == "label_entertainment"  && node.toElement().attribute("objectName") == "label_entertainment"){
  55. 		label->setText(node.toElement().text());
  56. 		grid->addWidget(label, 4, 2);
  57. 	    }
  58. 	    if(objectName_list.at(i) == "label_heater"  && node.toElement().attribute("objectName") == "label_heater"){
  59. 		label->setText(node.toElement().text());
  60. 		grid->addWidget(label, 4, 3);
  61. 	    }
  62. 	}
  63. 	node = node.nextSibling();
  64. 	i++;
  65. 	file->seek(0);
  66.     }
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On running it gives following error msg

ASSERT failure in QList<T>::at: "index out of range", file c:\QtSDK1\Desktop\Qt\4.7.3\mingw\include/QtCore/qlist.h, line 456
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.

I know that i am accessing a value which is out of range, but i do not not understand why?
Can anybody suggest me?
Thanks