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Libraries

ErrorHandler - Trade Error Classifier for MQL4 - library for MetaTrader 4

Martin Koprla
Martin Koprla

Martin Koprla

System Architecture & Algorithmic Diagnostics
I specialize in technical analysis optimization, custom MQL development, and high-performance trading utilities. My approach strictly rejects retail marketing hype, black-box systems, and over-optimized curve-fitting.
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handler

CErrorHandler is a robust, self-contained trade error classifier and automated recovery framework designed for MQL4 Expert Advisors.


### Features
- Maps MQL4 trade server return codes onto five distinct recovery actions (IGNORE, RETRY, WAIT, STOP_EA, ALARM).
- Tracks repeat-failure series per individual error code with configurable escalation limits.
- Implements integer-based exponential back-off delays to prevent EA thread blocking and eliminate busy-loops.
- Provides built-in diagnostic hints for error codes that are frequently misread or mishandled (e.g., ERR_INVALID_STOPS, ERR_TRADE_TOO_MANY_ORDERS).

### Minimal Usage
#include "ErrorHandler.mqh"
CErrorHandler g_err("MyEA");

for(int attempt = 0; attempt < 10; attempt++)
  {
   ResetLastError();
   int ticket = OrderSend(...);
   if(ticket >= 0) { g_err.ResetRetry(); break; }

   switch(g_err.Handle(GetLastError(), "OrderSend BUY"))
     {
      case EH_ACTION_RETRY:
      case EH_ACTION_WAIT:    continue;
      case EH_ACTION_ALARM:   continue;
      case EH_ACTION_STOP_EA: ExpertRemove(); return;
      case EH_ACTION_IGNORE:  break;
     }
  }
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