How to trap a stop loss event

 
beginner77:

If I have an open position and a stop loss event occured, how can I trap it?

Do I have to use the OnTrade event?


https://www.mql5.com/en/articles/211

might help 

Orders, Positions and Deals in MetaTrader 5
  • 2011.02.01
  • MetaQuotes Software Corp.
  • www.mql5.com
Creating a robust trading robot cannot be done without an understanding of the mechanisms of the MetaTrader 5 trading system. The client terminal receives the information about the positions, orders, and deals from the trading server. To handle this data properly using the MQL5, it's necessary to have a good understanding of the interaction between the MQL5-program and the client terminal.
Reason: