EA - OnDeinit - MT4 | Forex Factory

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EA - OnDeinit - MT4

  • #1
  • First Post: May 28, 2015 11:16am May 28, 2015 11:16am
I have what I hope is a simple question for all the coders out there. Can I code an EA to not go through a OnDeinit - OnInit when I change the chart period? I am fine with all the other reasons for the re-initialization to occur just not the period change.

Thank you in advance.
Today's zone = Tomorrow's opportunity!
  • #2
  • May 28, 2015 12:33pm May 28, 2015 12:33pm
Hi pres78,

I think that you can't as the EA is effectively unload and reloaded when you change the chart period.
Simplicity is the Ultimate Sophistication.
  • #3
  • May 28, 2015 12:42pm May 28, 2015 12:42pm
Quoting broketrader
Hi pres78, I think that you can't as the EA is effectively unload and reloaded when you change the chart period.
Thank you for the response broketrade. I have been searching various resources all day and haven't found anything that says whether it is possible. I found the list of what causes an EA to go through the re-initialization process but not how or whether they can be filtered through coding.

No worries as I found a working solution for the issue I was having anyway.
Today's zone = Tomorrow's opportunity!
  • #4
  • May 28, 2015 1:00pm May 28, 2015 1:00pm
There is one way, but it is messy.

As this is an EA (it won't work with indicators because the global scope variables get reset), declare a variable with global scope to act as a flag.

As part of the OnDeinit(), set the flag. Check this flag when running OnInit()

Inserted Code
#property strict
int LastReason=0;
int OnInit()
  {
   if(LastReason!=REASON_CHARTCHANGE)
     {
      Print("Not a chart change");
     }
   else
     {
      Print("Chart change");
     }
   return(INIT_SUCCEEDED);
  }
 
void OnDeinit(const int reason)
  {
   LastReason=reason;
  }
 
void OnTick  ()
  {
  }
  • #5
  • May 29, 2015 6:45am May 29, 2015 6:45am
Quoting honestknave
There is one way, but it is messy. As this is an EA (it won't work with indicators because the global scope variables get reset), declare a variable with global scope to act as a flag. As part of the OnDeinit(), set the flag. Check this flag when running OnInit() #property strict int LastReason=0; int OnInit() { if(LastReason!=REASON_CHARTCHANGE) { Print("Not a chart change"); } else { Print("Chart change"); } return(INIT_SUCCEEDED); } void OnDeinit(const int reason) { LastReason=reason; } void OnTick () { }

May I ask a questions?
In MT4, when some condition is met, eg, stop out all trades, I want EA to be stop, not run or not come back OnTick() again.
Which way can I do in void OnTick() ?
Call OnDeinit() to exit?
Call return()?
Set up/test flags?

Thank advance.
  • #6
  • Last Post: May 29, 2015 8:50am May 29, 2015 8:50am
Quoting Jack168
{quote} May I ask a questions? In MT4, when some condition is met, eg, stop out all trades, I want EA to be stop, not run or not come back OnTick() again. Which way can I do in void OnTick() ? Call OnDeinit() to exit? Call return()? Set up/test flags? Thank advance.
Just call ExpertRemove();
Simplicity is the Ultimate Sophistication.
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