Real-Time Quote Monitoring via Memory-Mapped Files
Info
The Real-Time Quote Monitoring via Memory-Mapped Files is a Expert Advisor for MetaTrader 5 that this expert advisor demonstrates the use of a dll for memory-mapped file operations. In this example, the Expert Advisor creates a virtual (memory-mapped) file and begins updating quotes for a specified symbol.
Usage
This tool is typically used for automated trading on major forex pairs and gold.
Platform
This Expert Advisor works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Experts folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use Real-Time Quote Monitoring via Memory-Mapped Files
1. Installation: Open the "File" menu, select "Open Data Folder," navigate to MQL/Experts, paste your file, and restart the terminal.
2. Activation: Drag the EA from the Navigator onto a chart, ensure "Allow live trading" is checked in the Common tab, and verify the AutoTrading button is green.
3. Optimization: Right-click your chart, choose "Expert List," click "Properties" to adjust inputs, and save your preferred setup as a set file for future use.
4. Maintenance: Regularly check the "Experts" tab in the terminal window to monitor trade logs and potential execution errors.
Frequently Asked Questions
Q: Why is my EA not opening trades? A: Check the "AutoTrading" button, ensure "Allow live trading" is enabled, and verify your broker allows automated trading on your account type.
Q: Can I run multiple EAs on one chart? A: No, each chart can only host one active EA; however, you can open multiple charts for different currency pairs to run several EAs.
Q: What does the "smiley face" icon mean? A: A smiley face in the top-right corner of the chart indicates the EA is successfully running; a frowny face means it is disabled.
What this tool does
This Expert Advisor demonstrates the use of a DLL for memory-mapped file operations.
Typical Use Case
This Expert Advisor excels in automated trading and technical analysis on MetaTrader 5.
Compatible Platform & Setup
This Expert Advisor works on MetaTrader 5. Place the file in the MQL5/Experts folder and restart the terminal.
Description & Settings
Related: Real-Time Market Intelligence for Informed Trading Decisions - another powerful expert for MetaTrader 5 traders.
This Expert Advisor demonstrates the use of a DLL for memory-mapped file operations.Also recommended: Real-Time Visualization of Optimization Results - similar expert with strong performance on MetaTrader 5.
In this example, the Expert Advisor creates a virtual (memory-mapped) file and begins updating quotes for a specified symbol.
This method allows Expert Advisors to exchange data, such as quotes, using a shared memory-mapped file.
The format of the memory-mapped file is identical to that used in MetaTrader 4, enabling quote exchange between MetaTrader 4 and MetaTrader 5.
Other forms of data exchange can be implemented using a similar approach.
The source code includes extensive comments and logging.
The memmap32/64.dll library (included in memmap32/64.zip) must be placed in the terminal_data_folder\mql5\libraries directory.
This utility is compatible with MetaTrader versions up to 2026.
You may also like: Real-Time World Index Quotes via WebRequest - excellent alternative for expert users on MetaTrader 5.
Source Code
#property copyright "robotfx"
#property link "https://robotfx.org"
#define modeopen 0 // open mode
#define modecreate 1 // create mode
#define error_file_not_found 2
#define handle32 int
#define handle64 long
#import "memmap32.dll"
handle32 memopen(string path,int size,int mode,int &err); // open/create memory-mapped file and returns handle
void memclose(handle32 hmem); // close memory mapped file.......
⚠ 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.