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Ihr erster Schritt in die moderne und leistungsstarke Prozessvisualisierung.
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Topics, you need to know, before using WinCC OA.
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Wachsen sie in Bezug auf Cybersecurity über die Norm hinaus.
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- Introduction to CTRL
  An introduction to the product's own programming language Control(CTRL).
- Control Classes
  The overview of classes available in Control.
- Types of Control Functions
  An overview of the types of functions distinguished within Control.
- Control graphics
- CONTROL Functions
  - Funtions A
  - Funtions B
  - Funtions C
  - Funtions D
  - Functions E
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  - Functions X
    - xmlAppendChild()
      Adds a new child node into the DOM tree as child of given node. Optionally the node's value can be set.
    - xmlChildNodes()
      Writes all child nodes of the given node into the nodes' reference parameter.
    - xmlCloseDocument()
      Closes the created XML document and destroys the occupied memory. After this call, the document ID is no longer valid.
    - xmlDocumentFromFile()
      Opens a file and reads the complete content building the DOM structure in memory.
    - xmlDocumentFromString()
      Reads the complete content from a string and builds the DOM structure in memory.
    - xmlDocumentToFile()
      Stores the internal DOM tree in an arbitrary XML file.
    - xmlDocumentToString()
      Returns the internal DOM tree as a string result.
    - xmlElementAttributes()
      Returns all node attributes as a mapping.
    - xmlFirstChild()
      Returns an internal ID to the first child node in the DOM tree.
    - xmlGetElementAttribute()
      Reads the value of the given attribute into the value reference parameter of the node.
    - xmlIsSameNode()
      Checks whether two node IDs are pointing to the same internal node within the DOM tree.
    - xmlNamedChild()
      This function allows you to easily find a child node in an xml document.
    - xmlNewDocument()
      Starts the creation of a new document in memory and returns the document ID.
    - xmlNextSibling()
      Returns an internal ID for the next sibling of the given node.
    - xmlNodeName()
      Returns the name of a node.
    - xmlNodePosition()
      The function returns the position of a node inside of an XML document.
    - xmlNodeType()
      Returns the type of the given node.
    - xmlNodeValue()
      Returns the value of the given node.
    - xmlParentNode()
      Returns the internal ID for the parent node of the given node.
    - xmlRemoveElementAttribute()
      Removes the given attribute from its node.
    - xmlRemoveNode()
      Removes the given node from its parent node.
    - xmlrpcCall()
      Calls the function "function" on the server with the arguments of the parameter "args". If "result" is specified, the function waits for the answer from the server and saves the answer in "result". This corresponds to the call result = function(args[1], ...);
    - xmlrpcClient
      Starts an XmlRpc client. The XmlRpc client is a Ctrl module that handles the calls in the background.
    - xmlrpcCloseServer()
      Closes the connection to the server.
    - xmlrpcConnectToServer()
      Establishes a connection to an XmlRpc server on host "host" and port "port". If "secure" is TRUE, a https connection is built. Under Windows the OpenSSL installation is required. The connection is valid only as long as it is open. This means if the connection is broken, the requests for the server will fail. Using the parameter "id", the server can be identified in the following calls.
    - xmlrpcDecodeRequest()
      Decodes the request and extracts the function name and arguments of it.
    - xmlrpcDecodeValue()
      Re-converts an XmlRpc-coded string to a variable.
    - xmlrpcEncodeResponse()
      Encodes the result in an XmlRpc message.
    - xmlrpcEncodeValue()
      Converts a "value" variable to an XmlRpc-coded string.
    - xmlrpcHandler()
      CtrlXmlRpc is a CTRL extension including XML-RPC functions. XML-RPC is a protocol for web services, similar to SOAP but much simpler.
    - xmlrpcSetGzipLimit()
      Defines from which size the contents of a request are compressed (gzip).
    - xmlSetElementAttribute()
      Sets the attribute of a node to given value.
    - xmlSetNodeValue()
      Sets the node's value to the given value.
  - Functions Y
  - Functions Z
- CtrlExtension
  Die CtrlExtension ermöglicht das Hinzufügen von benutzerdefiniertem C++-Code.
- CTRL-Debugger
  Der CTRL-Debugger ermöglicht ein Debuggen der Pogrammiersprache Control. Der Debugger kann über ein eigenes Panel verwendet werden, welches es auch erlaubt die Variablen zu beinflussen, Breakpoints zu setzen, usw.
- SQL in CONTROL
  Mit den Datenbankfunktionen besteht eine Möglichkeit, Werteabfragen von Datenpunkten und -elementen schnell durchzuführen.
- API Manager
  Das API von WinCC OA (Application Programming Interface) bietet eine Reihe von Funktionen, die es ermöglichen, dieses Prozessleitsystem um spezielle Manager zu erweitern.
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Videos & Tutorials
Erkunden Sie die Möglichkeiten von WinCC OA mit unserer sorgfältig ausgewählten Sammlung von Video-Tutorials und Anleitungen.
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Grundlegende Informationen über Bezeichnungen und Funktionsweisen innerhalb der Dokumentation.
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Erläuterungen zu Haftungsausschlüssen oder rechtlichen Hinweisen.

xmlSetNodeValue()

Sets the node's value to the given value.

Synopsis

int xmlSetNodeValue(unsigned doc, unsigned node, string value);

Parameters


Parameter	Description
doc	The document ID returned by e.g. xmlNewDocument().
node	Node name (ID)
value	New value of the node

Description

Sets the node's value to the given value.

The meaning of the value depends on the node type that is asked.

The following node type constants are here meaningful:


Constant	Meaning
XML_ATTRIBUTE_NODE	Attribute value
XML_CDATA_SECTION_NODE	Content of the CDATA section
XML_COMMENT_NODE	Comment
XML_PROCESSING_INSTRUCTION_NODE	Data of the processing instruction
XML_TEXT_NODE	Text

All the other node types do not have a node value and will return an empty string.

Example

This example creates a new document in memory and adds nodes to the document. It also sets attributes,

sets a node value and prints the content of the document.

#uses "CtrlXml"
main()
{
  int docNum = xmlNewDocument();
  xmlAppendChild(docNum, -1, XML_COMMENT_NODE, "my fine new
  comment");
  int node = xmlAppendChild(docNum, -1, XML_ELEMENT_NODE, "first
  element");
  node = xmlAppendChild(docNum, node, XML_ELEMENT_NODE,
  "sub_element");
  xmlSetElementAttribute(docNum, node, "anAttribute", "a
  value");
  node = xmlAppendChild(docNum, node, XML_TEXT_NODE, "some
  text");
  xmlSetNodeValue(docNum, node, "The new value");
  DebugN(xmlDocumentToString(docNum));
}

Assignment

XML Control Extension

Availability

CTRL. In every script where the "CtrlXml" extension (#uses "CtrlXml") is used.