mql5/Scripts/MyScripts/SymbolInfoStringChecker.md

Symbol Info String Checker Script

1. Summary (Introduction)

The Symbol Info String Checker is an MQL5 script designed as a diagnostic and development tool. When executed on a chart, it systematically queries and displays the status and value of every ENUM_SYMBOL_INFO_STRING property for the chart's current symbol.

Its primary purpose is to provide developers and advanced traders with a quick and comprehensive way to check the text-based metadata provided by their broker for a specific financial instrument. This includes crucial information like the symbol's description, the underlying base and profit currencies, the exchange it trades on, and its path in the Market Watch.

2. Features and Displayed Data

The script iterates through a comprehensive, hard-coded list of all ENUM_SYMBOL_INFO_STRING properties. For each property, it prints a formatted line to the "Experts" tab of the terminal, indicating:

• Property Name: The official enum name of the property (e.g., SYMBOL_CURRENCY_BASE).
• Status: Whether the request for the property was SUPPORTED or FAILED.
• Value / Error:
  • If supported, it displays the retrieved string value. For clarity, empty strings are explicitly marked as <EMPTY>, and non-empty strings are enclosed in single quotes (e.g., 'EUR').
  • If failed, it displays the error code returned by GetLastError().

The output is neatly aligned in columns for easy readability.

3. MQL5 Implementation Details

The script was refactored to follow a clean, object-oriented, and modular design, ensuring consistency with our other diagnostic tools.

• Object-Oriented Design: The core logic is encapsulated within a CSymbolStringPropertyChecker class. This isolates the functionality from the script's entry point (OnStart).

  • The constructor takes the symbol name as an argument.
  • A single public method, Run(), executes the entire checking process.
  • Private helper methods (PrintHeader, PrintFooter, PrintProperty, FormatValue) break down the logic into smaller, manageable pieces.

• Self-Contained Logic: The script is completely self-contained. It uses the standard <Trade\SymbolInfo.mqh> library but does not require any custom include files. The formatting logic is integrated into the class as a private FormatValue method.

• Static Property List: The array of ENUM_SYMBOL_INFO_STRING properties is defined as a static const member of the CSymbolStringPropertyChecker class. This logically associates the data with the class that uses it, which is a cleaner approach than using a global variable.

• Simplified OnStart: The script's entry point, OnStart(), is now extremely simple. It is only responsible for creating an instance of the CSymbolStringPropertyChecker class and calling its Run() method.

4. Usage

1. Installation:
   • Place SymbolInfoStringChecker.mq5 into your MQL5\Scripts folder.
2. Execution:
   • Open the chart of the symbol you wish to inspect.
   • Drag and drop the SymbolInfoStringChecker script from the Navigator window onto the chart.
3. Review Output:
   • Open the "Terminal" window (Ctrl+T).
   • Navigate to the "Experts" tab.
   • The script will print the full list of string properties and their status for the selected symbol. The script terminates automatically after printing the list.

5. Parameters

This script has no adjustable input parameters. It always runs on the symbol of the chart it is attached to.