Tc3JsonXmlSampleXmlDomWriter

This sample illustrates how an XML document can be created programmatically based on DOM. The function block FB_XmlDomParser is used as a basis.

Declaration range

PROGRAM MAIN
VAR
  fbXml : FB_XmlDomParser;
  objRoot : SXmlNode;
  objMachines : SXmlNode;
  objMachine : SXmlNode;
  objControllers : SXmlNode;
  objController : SXmlNode;
  objAttribute : SXmlAttribute;
  sXmlString : STRING(1000);
  bCreate     : BOOL := FALSE;
  bSave : BOOL := TRUE;
  nLength    : UDINT;
  newAttr : SXmlAttribute;
END_VAR

Implementation range

The implementation section shows various options for creating an XML document.

IF bCreate THEN
  (* Create an empty XML document *)
  objRoot := fbXml.GetDocumentNode();

  (* Create a new XML node 'Machines' and add to the empty document *)
  objMachines := fbXml.AppendNode(objRoot, 'Machines');
  
  (* Create a new XML node 'Machine' and add an attribute to this node. Append node to 'Machines' *)
  objMachine := fbXml.AppendNode(objMachines, 'Machine');
  objAttribute := fbXml.AppendAttribute(objMachine, 'Name', 'Wilde Nelli');

  (* Create a new XML node 'Controllers' and add to the 'Machine' node *)
  objControllers := fbXml.AppendNode(objMachine, 'Controllers');

  (* Create a new XML node 'Controller' and add some attributes. Append node to 'Controllers'. *)
  objController := fbXml.AppendChild(objControllers, 'Controller', 'CX5120', FALSE);
  objAttribute := fbXml.AppendAttribute(objController, 'Type', 'EPC');
  objAttribute := fbXml.AppendAttribute(objController, 'OS', 'Windows Embedded Compact 7');

  (* Create a new XML node 'Controller' and add some attributes. Append node to 'Controllers'. *)
  objController := fbXml.AppendChild(objControllers, 'Controller', 'CX2040', FALSE);
  objAttribute := fbXml.AppendAttribute(objController, 'Type', 'EPC');
  objAttribute := fbXml.AppendAttribute(objController, 'OS', 'Windows Embedded Standard 7');

  (* Create a new XML node 'Controller' and add some attributes. Append node to 'Controllers'. *)
  objController := fbXml.AppendChild(objControllers, 'Controller', 'C6015', FALSE);
  objAttribute := fbXml.AppendAttribute(objController, 'Type', 'IPC');
  objAttribute := fbXml.AppendAttribute(objController, 'OS', 'Windows 10 IoT Enterprise');

  (* Create a new XML node 'Machine' and add an attribute to this node. Append node to 'Machines' *)
  objMachine := fbXml.AppendNode(objMachines, 'Machine');
  objAttribute := fbXml.AppendAttribute(objMachine, 'Name', 'Stanze Oscar');
  
  (* Create a new XML node 'Controllers' and add to the 'Machine' node *)
  objControllers := fbXml.AppendNode(objMachine, 'Controllers');

  (* Create a new XML node 'Controller' and add some attributes. Append node to 'Controllers'. *)
  objController := fbXml.AppendChild(objControllers, 'Controller', 'C6017', FALSE);
  objAttribute := fbXml.AppendAttribute(objController, 'Type', 'IPC');
  objAttribute := fbXml.AppendAttribute(objController, 'OS', 'Windows 10 IoT Enterprise');
  newAttr := fbXml.InsertAttribute(objController, objAttribute, 'AddAttribute');
  fbXml.SetAttribute(newAttr, 'Hola');

  (* Retrieve XML document and store in a variable of data type STRING(1000) *)
  nLength := fbXml.CopyDocument(sXmlString, SIZEOF(sXmlString));
  bCreate := FALSE;
END_IF