Index out of range problem for a xml file

[Niamita]

Hi all

I have following code

QStringList objectName_list;
    objectName_list<<"label_master_ac"<<"label_living_ac"<<"label_dining_ac"<<"label_bathroom_geyser"<<"label_entertainment"
		  <<"label_heater";
 
    QFile *file = new QFile("E:/label_with_xml_file/labelname.xml");
    if (!file->open(QFile::ReadOnly | QFile::Text)) {
	QMessageBox::warning(this, tr("Error: Cannot read file"),tr(qPrintable(file->errorString())));
    }
    QDomDocument doc;
    doc.setContent(file);
    QDomElement root = doc.documentElement();
    QDomNode node = root.firstChild();
    i=0;
    while(!node.isNull())
    {
	if(node.toElement().tagName() == "label"){
	    if(node.toElement().attribute("objectName") != "label_master_ac" &&
		  node.toElement().attribute("objectName") != "label_living_ac" &&
		  node.toElement().attribute("objectName") != "label_dining_ac" &&
		  node.toElement().attribute("objectName") != "label_bathroom_geyser"
		  && node.toElement().attribute("objectName") != "label_entertainment"
		  && node.toElement().attribute("objectName") != "label_heater"){
 
		qDebug()<<"while"<<node.toElement().attribute("objectName");
		node = node.nextSibling();
		continue;
	    }
	    qDebug()<<QString::number(i);
	    QLabel *label = new QLabel(this);
	    QFont font("Verdana", 10);
	    font.setBold(true);
	    label->setFont(font);
	    label->setAlignment(Qt::AlignCenter);
	    label->setFixedHeight(screenHeight/35);
	    label->setStyleSheet("QLabel { background-color: rgb(240, 240, 240,255); color: rgb(131, 64, 0, 255);}");
	    label->setObjectName(objectName_list.at(i));
	    qDebug()<< node.toElement().attribute("objectName");
	    if(objectName_list.at(i) == "label_master_ac"  && node.toElement().attribute("objectName") == "label_master_ac"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 0,1);
	    }
	    if(objectName_list.at(i) == "label_living_ac"  && node.toElement().attribute("objectName") == "label_living_ac"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 0,2);
	    }
	    if(objectName_list.at(i) == "label_dining_ac"  && node.toElement().attribute("objectName") == "label_dining_ac"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 0,3);
	    }
	    if(objectName_list.at(i) == "label_bathroom_geyser"  && node.toElement().attribute("objectName") == "label_bathroom_geyser"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 4, 1);
	    }
	    if(objectName_list.at(i) == "label_entertainment"  && node.toElement().attribute("objectName") == "label_entertainment"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 4, 2);
	    }
	    if(objectName_list.at(i) == "label_heater"  && node.toElement().attribute("objectName") == "label_heater"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 4, 3);
	    }
	}
	node = node.nextSibling();
	i++;
	file->seek(0);
    }

QStringList objectName_list;
    objectName_list<<"label_master_ac"<<"label_living_ac"<<"label_dining_ac"<<"label_bathroom_geyser"<<"label_entertainment"
		  <<"label_heater";

    QFile *file = new QFile("E:/label_with_xml_file/labelname.xml");
    if (!file->open(QFile::ReadOnly | QFile::Text)) {
	QMessageBox::warning(this, tr("Error: Cannot read file"),tr(qPrintable(file->errorString())));
    }
    QDomDocument doc;
    doc.setContent(file);
    QDomElement root = doc.documentElement();
    QDomNode node = root.firstChild();
    i=0;
    while(!node.isNull())
    {
	if(node.toElement().tagName() == "label"){
	    if(node.toElement().attribute("objectName") != "label_master_ac" &&
		  node.toElement().attribute("objectName") != "label_living_ac" &&
		  node.toElement().attribute("objectName") != "label_dining_ac" &&
		  node.toElement().attribute("objectName") != "label_bathroom_geyser"
		  && node.toElement().attribute("objectName") != "label_entertainment"
		  && node.toElement().attribute("objectName") != "label_heater"){

		qDebug()<<"while"<<node.toElement().attribute("objectName");
		node = node.nextSibling();
		continue;
	    }
	    qDebug()<<QString::number(i);
	    QLabel *label = new QLabel(this);
	    QFont font("Verdana", 10);
	    font.setBold(true);
	    label->setFont(font);
	    label->setAlignment(Qt::AlignCenter);
	    label->setFixedHeight(screenHeight/35);
	    label->setStyleSheet("QLabel { background-color: rgb(240, 240, 240,255); color: rgb(131, 64, 0, 255);}");
	    label->setObjectName(objectName_list.at(i));
	    qDebug()<< node.toElement().attribute("objectName");
	    if(objectName_list.at(i) == "label_master_ac"  && node.toElement().attribute("objectName") == "label_master_ac"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 0,1);
	    }
	    if(objectName_list.at(i) == "label_living_ac"  && node.toElement().attribute("objectName") == "label_living_ac"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 0,2);
	    }
	    if(objectName_list.at(i) == "label_dining_ac"  && node.toElement().attribute("objectName") == "label_dining_ac"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 0,3);
	    }
	    if(objectName_list.at(i) == "label_bathroom_geyser"  && node.toElement().attribute("objectName") == "label_bathroom_geyser"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 4, 1);
	    }
	    if(objectName_list.at(i) == "label_entertainment"  && node.toElement().attribute("objectName") == "label_entertainment"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 4, 2);
	    }
	    if(objectName_list.at(i) == "label_heater"  && node.toElement().attribute("objectName") == "label_heater"){
		label->setText(node.toElement().text());
		grid->addWidget(label, 4, 3);
	    }
	}
	node = node.nextSibling();
	i++;
	file->seek(0);
    }

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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

[Lesiok]

Because in line 64 i is incremented, but never is checked if i < objectName_list.size() and node have more elements than objectName_list.