Features of the mql5 language, subtleties and tricks - page 66

[Konstantin]

fxsaber:

Reductions.

Well I reset the array through FileWriteArray, if FileSave reduces the size, then the developers should probably adjust the code of the FileWriteArray function

[fxsaber]

Konstantin:

Well, I reset the array through FileWriteArray, if FileSave reduces the size, then the developers probably need to adjust the code of the FileWriteArray function

Look in the Help.

[fxsaber]

Forum on trading, automated trading systems and trading strategies testing

Discussion of the article "Hedging position accounting system added to MetaTrader 5"

fxsaber, 2018.01.17 18:45

Chronologically

1. Pending order triggered partially - opened position with Position_ID = Order_Ticket.
2. Closed the position manually.
3. The rest of the order has been executed - the position with Position_ID != Order_Ticket has opened.

The result of ORDER_POSITION_ID, and how the HistorySelectByPosition will work is still a question.

Obviously, the DEAL_ORDER of one (out of two) opening deal in its order will be DEAL_POSITION_ID != ORDER_POSITION_ID.

So, you really shouldn't count on HistorySelectByPosition, even for Hedges.

[fxsaber]

After setting the EventTimer the first call to OnTimer does not happen immediately, but after a specified timer interval.

[Alexey Viktorov]

fxsaber:

After setting the EventTimer the first call to OnTimer does not happen immediately, but after a specified timer interval.

Interesting and useful observation. Thank you. But it's logical...

[fxsaber]

A nuance of comparing integers using a real example

void OnStart()
{
  const ulong StartTime = GetMicrosecondCount();
  
  Sleep(1000);
  
//  if (GetMicrosecondCount() > StartTime + 1000000) // Неправильно
  if (GetMicrosecondCount() - StartTime > 1000000) // Правильно
    Print("Прошло больше секунды.");
  else
    Print("Прошло меньше секунды."); 
}

[TheXpert]

fxsaber:
A nuance of comparing integers on a real example

1e6 is a literal of type double.

[fxsaber]

Combinator:
1e6 is a literal of type double.

Knowing. The example is not affected by this. Think of it as an integer million.

[TheXpert]

fxsaber:

Knowing. The example is not affected.

It directly affects

[fxsaber]

Combinator:
Affects directly

I agree, but that's not what this example is about. In the code I replaced it with a million.