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Xml Parser
Info
The Xml Parser is a Library for MetaTrader 5 that the cxmlelementclass provides the following opportunities for working with xml documents. It allows you to create DOM-model (objects tree) from the XML-document (or from its single element); It allows you to read, modify, create and delete the nested elements and text; It allows you to save the object model to XML.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Libraries folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use Xml Parser
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
What this tool does
The CXmlElementclass provides the following opportunities for working with XML documents.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 5.
Compatible Platform & Setup
This Library works on MetaTrader 5. Place the file in the MQL5/Libraries folder and restart the terminal.
Description & Settings
Related: XM L parser - another powerful library for MetaTrader 5 traders.
The
CXmlElement
class provides the following opportunities for working with XML documents.
It allows you to create DOM-model (objects tree) from the XML-document (or from its single element);
Also recommended: Easy XM L - XM L Parser - similar library with strong performance on MetaTrader 5.
It allows you to read, modify, create and delete the nested elements and text;
It allows you to save the object model to XML.
Class interface:
class CXmlElement { public: string Name; CXmlElement *Elements[]; CXmlAttribute *Attributes[]; string Text; ... string SetXml (string xml); string GetXml (); };
For access to the class attributes a simple class
CXmlAttribute
is used:
class CXmlAttribute { public: string Name; string Value; };
Here is a simple example of script, that parses XML and prints an information from DOM tree:
//+------------------------------------------------------------------+ //| XmlParserScript.mq5 | //| Copyright 2009, MetaQuotes Software Corp. | //| | //| yu-sha@ukr.net | //+------------------------------------------------------------------+ #include <XmlParser.mqh> //+------------------------------------------------------------------+ //| Script start | //+------------------------------------------------------------------+ void OnStart() { CXmlElement xmldoc; string xml="<!--Comment--><ROOT><ITEM Attr1=\"HELLOW\">Terminal "MT5"</ITEM></ROOT>"; Print("XML="+xml); string res=xmldoc.SetXml(xml); if(res=="") { Print("The Root element: "+xmldoc.Name); Print(" Number of Attributes: "+string(ArraySize(xmldoc.Attributes))); Print(" Nested elements: "+string(ArraySize(xmldoc.Elements))); Print(" First nested element:"+xmldoc.Elements[0].Name); Print(" Its first attribute: "+xmldoc.Elements[0].Attributes[0].Name+"="+xmldoc.Elements[0].Attributes[0].Value); Print(" Its text: "+xmldoc.Elements[0].Text); Print("XML="+xmldoc.GetXml()); } else Print(res); } //+------------------------------------------------------------------+
Here is a result of script execution:
Additional information:
The current version loads into the DOM only the elements, their attributes and text. All other types of the information (comments, descriptions, ...) are ignored. As a result - maybe the loss of the information about codepage, version, so XML document may be saved incorrectly.
While saving it converts the special symbols like <"&'> into the essences like <:, >, ... according to the standard.
This parser is intended mostly for parsing the XML documents, rather than fully working with XML documents.
Files location:
terminal_data_folder\MQL5\Libraries\xmlparser.dll
terminal_data_folder\MQL5\Include\xmlparser.mqh
terminal_data_folder\MQL5\Scripts\xmlparserscript.mq5
You may also like: Permutations and Combinations - excellent alternative for library users on MetaTrader 5.
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.