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MetaTrader 5 build 2485: iCustom improvements and overall optimization in MQL5

What's new in MetaTrader 5

5 June 2020


  1. Optimized and significantly accelerated bar history editing for custom financial instruments. The improvement also concerns the CustomRatesUpdate function.
  2. Fixed exporting of custom symbol settings to a JSON file.
  3. Fixed errors reported in crash logs.


  1. This version features a revised custom indicator loading algorithm via iCustom.

    If the backslash '\' is indicated before the custom indicator name, the EX5 indicator file is searched relative to the MQL5 root folder. So, for a call of iCustom(Symbol(), Period(), "\FirstIndicator"...), the indicator will be loaded as MQL5\FirstIndicator.ex5. If the file is not found at this path, error 4802 (ERR_INDICATOR_CANNOT_CREATE) is returned.

    If the path does not start with a backslash '\', the indicator is searched and loaded based on the following sequence of actions:

    • The EX5 file is searched in the same folder, where the caller program's EX5 is located. For example, the CrossMA.EX5 Expert Advisor is located at MQL5\Experts\MyExperts. It contains the following call: iCustom(Symbol(), Period(), "SecondIndicator"...). In this case, the indicator is searched at MQL5\Experts\MyExperts\SecondIndicator.ex5.
    • If the indicator is not found, a search relative to the Indicators root directory is performed: MQL5\Indicators. Thus, file MQL5\Indicators\SecondIndicator.ex5 is searched. If the indicator is not found, the function returns INVALID_HANDLE and error 4802 (ERR_INDICATOR_CANNOT_CREATE) is raised.

    If the indicator path is set in a subdirectory such as MyIndicators\ThirdIndicator, the search starts in the folder of the calling program (the Expert Advisor is located in the folder MQL5\Experts\MyExperts) at the following path: MQL5\Experts\MyExperts\MyIndicators\ThirdIndicator.ex5. In case of failure, file MQL5\Indicators\MyIndicators\ThirdIndicator.ex5 is searched. Please note that the path separator should be specified as a double backslash '\\'. For example: iCustom(Symbol(), Period(), "MyIndicators\\ThirdIndicator"...)

    Also, if a custom indicator call via iCustom is found in the program code, the compiler will implicitly add the "#property tester_indicator XXX" directive if it is not specified.

  2. Optimized and significantly accelerated HistorySelect function, which allows requesting the history of deals and orders.
  3. Fixed an occasional error in tick requesting via the CopyTicksRange function. The error caused the range beginning to be set to the day beginning rather than to the specified time.
  4. Optimized and significantly accelerated display of alerts via the Alert function.
  5. New property SYMBOL_TIME_MSC for the symbol's last tick time in milliseconds. The property can be obtained using the SymbolInfoInteger function.