Hi all

i am in a trouble. My xml file is not edit right. Whem i am editing the file the contents to be edit are written in file with the rest data of file again. I am using Dom for reading and writing xml.

My code is

Qt Code: 
  1. void HomeWindow::create_xml_file()
  2. {
  3.     QFile *file = new QFile("E:/new.txt");
  4.     if(!edit_flag){ /// craeting the file and write in it in this condition
  5.     const int Indent = 4;
  6.     int id_value;
  7.     static QDomDocument doc;
  8.     static QDomElement root,root1;
  9.     QDomElement statement, action_node, condition_node;
  10.     QDomText id_text;
  11.     root = doc.createElement("root");
  12.  
  13.     if(!file->exists())
  14.     {
  15. 	file->open(QIODevice::WriteOnly);
  16. 	QDomElement id = doc.createElement("id");
  17. 	id_text = doc.createTextNode("0");
  18. 	root.appendChild(id);
  19. 	id.appendChild(id_text);
  20. 	doc.appendChild(root);
  21.     }
  22.     else
  23.     {
  24. 	file->open(QFile::ReadWrite);
  25. 	doc.setContent(file);
  26. 	root1 = doc.documentElement();
  27. 	QDomElement node = root1.firstChildElement("id");
  28. 	QString id_string = node.text();
  29. 	id_value = id_string.toInt();
  30. 	QDomElement new_id_node = doc.createElement(QString("id"));
  31. 	QDomText new_id_Text = doc.createTextNode(QString::number(++id_value));
  32. 	new_id_node.appendChild(new_id_Text);  // replace existing node with new node
  33. 	root1.replaceChild(new_id_node, node);
  34. 	statement = doc.createElement("statement");
  35. 	condition_node = doc.createElement("condition");
  36. 	action_node = doc.createElement("action");
  37. 	QDomText condition_text = doc.createTextNode(condition_text_edit->toPlainText());
  38. 	QDomText action_text = doc.createTextNode(action_text_edit->toPlainText());
  39. 	statement.setAttribute("id", id_value);
  40. 	statement.appendChild(condition_node);
  41. 	statement.appendChild(action_node);
  42. 	condition_node.appendChild(condition_text);
  43. 	action_node.appendChild(action_text);
  44. 	root1.appendChild(statement);
  45. 	file->seek(0);
  46. 	static int i =1;
  47. 	table->setRowCount(i);
  48. 	QTableWidgetItem *item_id = new QTableWidgetItem(QString::number(id_value));
  49. 	QTableWidgetItem *item_condition = new QTableWidgetItem(condition_text_edit->toPlainText());
  50. 	QTableWidgetItem *item_action = new QTableWidgetItem(action_text_edit->toPlainText());
  51. 	int row = i;
  52. 	row = --row;
  53. 	table->setItem(row, 0, item_id);
  54. 	table->setItem(row, 1, item_condition);
  55. 	table->setItem(row, 2, item_action);
  56. 	i++;
  57. 	condition_text_edit->clear();
  58. 	action_text_edit->clear();
  59.     }
  60.     QTextStream out(file);
  61.     doc.save(out, Indent);
  62.     if(file->error())
  63. 	qDebug()<<"error"<<file->errorString();
  64.     }
  65.     else{          ///////edit the file 
  66. 	const int indent  =8;
  68. 	file->open(QFile::ReadWrite);
  69. 	doc.setContent(file);
  70. 	QDomElement root_edit = doc.documentElement();
  71. 	QDomNode node = root_edit.firstChild();
  72. 	while(!node.isNull())
  73. 	{
  74. 	    if (node.toElement().tagName() == "statement"){
  75. 		if(string_id == node.toElement().attribute("id"))
  76. 		{
  77. 		    QDomElement statement = doc.createElement("statement");
  78. 		    statement.setAttribute("id", string_id);
  79. 		    QDomElement condition_node = doc.createElement("condition");
  80. 		    QDomElement action_node = doc.createElement("action");
  81. 		    QDomText condition_text = doc.createTextNode(condition_text_edit->toPlainText());
  82. 		    QDomText action_text = doc.createTextNode(action_text_edit->toPlainText());
  83. 		    statement.appendChild(condition_node);
  84. 		    statement.appendChild(action_node);
  85. 		    condition_node.appendChild(condition_text);
  86. 		    action_node.appendChild(action_text);
  87. 		    root_edit.replaceChild(statement, node.toElement());
  88. 		    break;
  89. 		}
  90. 	    }
  91. 	node = node.nextSibling();
  92. 	}
  93. 	QTextStream out(file);
  94. 	doc.save(out, indent);
  95. 	QTableWidgetItem *item_id = new QTableWidgetItem(string_id);
  96. 	QTableWidgetItem *item_condition = new QTableWidgetItem(condition_text_edit->toPlainText());
  97. 	QTableWidgetItem *item_action = new QTableWidgetItem(action_text_edit->toPlainText());
  98. 	table->setItem(row_index, 0, item_id);
  99. 	table->setItem(row_index, 1, item_condition);
  100. 	table->setItem(row_index, 2, item_action);
  101. 	condition_text_edit->clear();
  102. 	action_text_edit->clear();
  103. 	edit_flag = false;
  104.     }
  105. }
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My xml file is looking like following

<root>
<id>3</id>
<statement id="1">
<condition>Digital Input Equals to END</condition>
<action>Analog Output Equals to END</action>
</statement>
<statement id="2">
<condition>Digital Input Equals to END</condition>
<action>Analog Output Equals to END</action>
</statement>
<statement id="3">
<condition>Digital Input Equals to END</condition>
<action>Analog Output Equals to END</action>
</statement>
</root>
tput Equals to END</action>
</statement>
<statement id="2">
<condition>Digital Input Equals to END</condition>
<action>gffjryjuuyd</action>
</statement>
</root>
<root>
<id>3</id>
<statement id="1">
<condition>Digital Input Equals to END</condition>
<action>Analog Output Equals to END</action>
</statement>
<statement id="2">
<condition>Digital Input Equals to END</condition>
<action>Analog Output Equals to END</action>
</statement>
<statement id="3">
<condition>Digital Input Equals to END</condition>
<action>gjkghk</action>
</statement>
</root>


Please guide me where i am wrong.
Waiting for quick reply.
Thanks.