Simplest Logger class for MetaTrader 5 - library for MetaTrader 5

1. Copy CDKLogger.mqh to MQL\Include\DKStdLib\Logger folder.
2. Import CDKLogger class.

#include <DKStdLib\Logger\CDKLogger.mqh

Usage

CDKLogger logger;

// STEP 1. Init Logger with "MyLoggerName" name and INFO level
logger.Init("MyLoggerName", INFO);

// You can change default logger format "%name%:[%level%] %message%" to your own
// Use any pattern combination 
logger.Format = "%YYYY%-%MM%-%DD% %hh%:%mm%-%ss% - %name%:[%level%] %message%"; 

// STEP 2. If you like to filter message only with substings,
//         fill the FilterInList 
// 2.1. Add a substings to FilterIntList
logger.FilterInList.Add("Including-Substring-#1");        
logger.FilterInList.Add("Including-Substring-#2");        

// 2.2. Split string by ";" separator to add all substrings to FilterInList in one line
logger.FilterInFromStringWithSep("Including-Substring-#3;Including-Substring-#4", ";");  

// STEP 3. If you like to filter OUT message with substrings, but leave all others,
//         fill the FilterOutList 
// 3.1. Add a substrings to FilterOutList
logger.FilterOutList.Add("Excluding-Substring-#1");        
logger.FilterOutList.Add("Excluding-Substring-#2");        

// 3.2. Split string by ";" separator to add all substrings to FilterOutList in one line
logger.FilterOutFromStringWithSep("Excluding-Substring-#3;Excluding-Substring-#4", ";");  // use Filter In put your filter str sep by ; here

// STEP 4. Logging
logger.Debug("Debug: Including-Substring-#1", false);                  // Debug with no Alert
logger.Info("Info: Including-Substring-#1", true);                     // Info with Alert dialog
logger.Warn("Warn: Including-Substring-#1"); 
logger.Error("Error: Including-Substring-#1: Excluding-Substring-#1"); // Skipped because of FilterOutList
logger.Critical("Critical: Including-Substring-#1");

logger.Assert(true, 
              "Log msg if true", INFO,   // if ok
              "Log msg if false", ERROR, // if fails
              true);                     // Show Alert as well
logger.Assert(true, 
              "Same msg for true & false", 
              INFO,   // Log level if ok
              ERROR,  // Log level if fails
              false); // No Alert