With the help of this library it is possible to implement the ability to maintain positions with a simple trailing stop in any Expert Advisor. This library is universal and is designed to be able to connect to virtually any EA using the #include compiler directive and granting the EA the ability to maintain positions with a simple trailing stop.
In order to connect the library to an EA it is necessary to make the following changes:
1. Insert the compiler directive before the declaration of functions:
2. Declare the global variables:
color clModifyBuy = Aqua; // Color of Buy modification icon color clModifySell = Tomato; // Color of Sell modification icon
3. Declare the external parameters:
// Use sound signals during the execution of trades extern bool UseSound = True; extern string NameFileSound = "expert.wav"; // Name of the sound file extern int NumberOfTry = 3; // Number of trade attempts on errors extern int PauseAfterError = 75; // Pause between trade attempts in seconds
4. Insert the line at the end of the start() function:
5. Place the library file a-SimpleTrailing.mqh into the terminal folder ...\experts\include\
Once the library is connected, the EA will have the following external parameters:
// Use trailing stop. If 'False', the trailing stop is disabled. UseTrailing = True; // Trail only profit. If 'False', then the trailing stop will start // working in the unprofitable zone. ProfitTrailing = True; TrailingStopBuy = 50; // Trailing stop size for Buy orders. TrailingStopSell = 50; // Trailing stop size for Sell orders. TrailingStep = 5; // Trailing step.The TrailingPositions() function can take on the following parameters:
- symbol name ("" - current symbol);
- operation (-1 - any position, 0 - Buy, 1 - Sell);
- MagicNumber (-1 - any magic number).
This allows to narrow the scope of the trailing stop operation. For example, trail only Euro:
Or trail only Pound Sells:
if(UseTrailing) TrailingPositions("GBPUSD", OP_SELL);
And if the EA uses a magic number, then it must be passed to the maintenance function:
if(UseTrailing) TrailingPositions("", -1, MAGIC);
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/7069
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