Project Members:

• TimvH
• aliazzz (admin)
• hermsen
• i-campbell

Usage

Simple and straightforward XML parsing and composing library.
The example shows how to compose and parse.

Usage

1. Initialise

VAR
    XML : FB_XMLControl;
    Buffer: STRING(GVL_Param_XmlControl.udiMaxFileSize);
    // or buffer as an array of BYTE
    Buffer: ARRAY [0..GVL_Param_XmlControl.udiMaxFileSize] OF BYTE;
END_VAR

    // call
    XML.pBuffer: = ADR (buffer);
    XML.LenBuffer: = SIZEOF (buffer);

1. Add your own preferred XML fileheader i.e.:

    // call
    XML.WriteDocumentHeader( '<?xml version="1.0" encoding="UTF-8"?>');

1. Compose a tag with a parameter:

<mytag paraname="11"></mytag>

    // call
    XML.newTag(sTagName: = 'MyTag');
    XML.newParameter(Name: = 'ParaName', Parameter: = 11);
    XML.CloseTag();

1. Add a value to the tag:

<mytag> MyText </ MyTag></mytag>

    // call
    XML.newTag(Name := 'MyTag');
    XML.newTagData(TagData :='MyText');
    XML.CloseTag();

1. Jump to the beginning of the XML data in the buffer

    // call
    XML.toStartBuffer();

1. Add a comment to the XML in the buffer;

    // call
    XML.newComment(sTagName: = 'MyComment');

1. Returns the next tag from the current position in buffer;

    // call
    XML.NextTag();

1. Output the parameter of the tag;

    // call
    XML.NextParameter(Parameter: = LastValue);

Feedback: Parameter returns the value found (string)

Library conents

FB_FileControl;
This function block can open, close, read and save a file from and to a generic PLC memory buffer. It can also read a small portions (chunks) of the file from disk to memory which enables you to load larger files in small portions.

FB_StringBuffer;
Acts as an IO stream buffer for use with FB_XmlControl. Data can be treated as STRING or array of bytes. The StringBuffer can also be used for other purposes like textfiles, csv, etc, etc.

FB_XmlControl:
Organizes Parsing and Composing of XML data. Filebuffersize can be set via library parameter (Gvl_Param_XmlControl)

    Note: 

    Files do not necessarily need to be in a .xml format so you can use filecontrol to access or write any type of file.
    Offcourse parsing and composing via xmlcontrol is only supported for xml formatted files.

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