FB_XmlWrite Example

Overview

The following example shows how the elements and attributes stored in the buffer provided by the application are written to the XML file. In addition to the elements and attributes, an example for the additional content is provided.

Buffer

The buffer provided by the application of type XmlItems contains elements to be written to the XML file.

Array Index	diParentIndex	sName	sValue	etType	diNumOfAttributes
0	-1	AAA	–	1	0
1	0	BBB	1st bbb	1	0
2	0	BBB	–	1	0
3	2	CCC	–	1	1
4	–	id	1	2	1
5	3	DDD	ddd	1	2
6	–	id	1	2	1
7	–	activate	TRUE	2	2

Example Program

PROGRAM SR_Example
VAR
  fbWrite :FFU.FB_XmlWrite;
  astXmlItems :FFU.XmlItems;
  xCmdWrite :BOOL;
  sComment :STRING(255) := 'This is the user comment.';
  sExternalDTD :STRING := '<!DOCTYPE AAA SYSTEM "example.dtd">';
  stHeader :FFU.ST_XmlUserDefinedHeader;
END_VAR

stHeader.sUserComment := sComment;
stHeader.pbyAdditionalContent := ADR(sExternalDTD);
stHeader.udiNumBytesToWrite := INT_TO_UDINT(Standard.LEN(sExternalDTD));

fbWrite(
        i_xExecute := xCmdWrite,
        i_sFilePath := '/sd0/Example.xml',
        i_xOverwriteFile := ,
        i_sRootElement := ,
        i_refXmlItems := astXmlItems,
        i_stUserDefinedHeader := stHeader,
        i_timTimeout := ,
        q_xDone => ,
        q_xBusy => ,
        q_xError => ,
        q_etResult => ,
        q_sResultMsg => );

Example XML File

<?xml version="1.0" encoding="ASCII"?>

<!DOCTYPE AAA SYSTEM "example.dtd">

<AAA>
  <BBB>1st bbb</BBB>
    <CCC id="1">
      <DDD id="1" activate="TRUE">ddd</DDD>
    </CCC>
  </BBB>
</AAA>