Can I stop an EA by itself | Forex Factory

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Can I stop an EA by itself

  • #1
  • First Post: Sep 2, 2009 9:28pm Sep 2, 2009 9:28pm
Hello, I want to control the max loss of an EA---When the loss reaches a certain amount, then stop it. I know I can set a varible as a flag in start() to do that. But its not ideal since the flag will loose in many cases(like restarting the computer).

So I have to know
1) Is there a better way to tell MT4 :not run a certain EA by that EA itself ?
2) Can I use an EA to switch off MT4 expert advisor function?
one more question occurs to me
3)If my MT4 is running, but I lose the internet connection or the market is closed. Then after its back to normal, will the EA start to run from Init() automatically or from start()?
Thanks ahead.
  • #2
  • Sep 2, 2009 10:10pm Sep 2, 2009 10:10pm
dont have a lot of time right now, but look into global variables....
Stubbornly persistent
  • #3
  • Edited Sep 3, 2009 4:36am Sep 2, 2009 10:51pm | Edited Sep 3, 2009 4:36am
Instead of looking at maximumloss, why not just have as an input the minimum accountsize that you can accept? You know what the account starts at, so by typing in minimum account size you control the max loss as well. Should be easy to code. All you need is a "if(AccountBalance()>=minAccSize)" around the part of the EA that puts the orders, with "extern double minAccSize" as an external input.
  • #4
  • Sep 5, 2009 8:35pm Sep 5, 2009 8:35pm
Quoting catthinker
Hello, I want to control the max loss of an EA---When the loss reaches a...


You could set the equity + x dollars = equity balance. Then at the beginning of start, check equity balance and if it is not greater than your required balance, then return (0). That will switch it off and keep it off regardless of how many times you restart your computer. Better have a start date for the code though or it will never trade in the first place.
  • #5
  • Sep 6, 2009 2:12am Sep 6, 2009 2:12am
if your problem is how to persist some information between EA (and system) restarts, try to save your data to a file. Works fine.

http://docs.mql4.com/files
forget about tomorrow, just steal away into the night
  • #6
  • Sep 6, 2009 6:33am Sep 6, 2009 6:33am
I would start with NowAndLater's suggestion as it's the easiest way.

Try and see if it works for you.
  • #7
  • Sep 6, 2009 7:32am Sep 6, 2009 7:32am
i know nothing about ea's, i have some basic questions
it seems i have turn on one , on demo account
i'm quite sure it will make trades
BUT
i'm wondering if i turn off mt4 will it still work?
because for expample simple trailing stop cant work if mt4 is turned off
and if i log into another account, will that ea make trades for me?
i'm asking here because that ea takes trades once a few days so i wouldnt get my answer fast
thanks

i think i see now that it is impossible to work when platform is not working but i need to be sure, thanks for answer
it just little strange that my strategy to work require computer working continuosly for months?? )
  • #8
  • Sep 6, 2009 7:55am Sep 6, 2009 7:55am
Quoting cinex
i know nothing about ea's, i have some basic questions
it seems i have turn on one , on demo account
i'm quite sure it will make trades
BUT
i'm wondering if i turn off mt4 will it still work?
because for expample simple trailing stop cant work if mt4 is turned off
and if i log into another account, will that ea make trades for me?
i'm asking here because that ea takes trades once a few days so i wouldnt get my answer fast
thanks

i think i see now that it is impossible to work when platform is not working but i need to be sure,...
No, ea will work only if your metatrader is open, once it is shut down, so is the ea.

If you want the ea to work even if your pc is off, you should purchase a vps, search on google for 'mt4 vps'.

you can run ea on another account simultaneously by opening several instances of mt4, you can't run ea's from the same instance on 2 different accounts.

hope it help.
  • #9
  • Sep 6, 2009 10:02am Sep 6, 2009 10:02am
thanks wilkinson that helped me
so simply saing ea to work require mt4 open all the time and you have to be logged in to account on which you want to make trades using that ea all the time also
thats fine.
  • #10
  • Apr 21, 2011 3:57am Apr 21, 2011 3:57am
Quoting wilkinson
No, ea will work only if your metatrader is open, once it is shut down, so is the ea.

If you want the ea to work even if your pc is off, you should purchase a vps, search on google for 'mt4 vps'.

you can run ea on another account simultaneously by opening several instances of mt4, you can't run ea's from the same instance on 2 different accounts.

hope it help.
I am newbie to EA.
Can you please help me on the following situation :-
1) I do not know how to stop/shut an EA.
-The EA keep opening new order after I have close all positons and turn off Expert Advisor(from green to red).
2)About the instance as mentioned by you I am quite confuse as I have encounterred strange situation.
- The EA keep opening new order from existing account and other account with the EA on the same chart.
- The EA had turned/locked my demo account into real account(i.e my real account order appeared in demo account and the demo acc icon had turn to gold color).

Kindly help.Thank you.
  • #11
  • Aug 22, 2011 1:16am Aug 22, 2011 1:16am
One way to have an EA "switch" itself off.



Inserted Code
....
// initialization stuff ...
bool EAEnabled = true;// more initialization stuff ...
 
 
int start()
{
   // check that EA is enabled _BEFORE_ trying to
   // do anything else in start()
 
   if (!EAEnabled)
   {
      return(0);
   }
 
   // Normal EA code starts here ...
 
   if (Something_Bad_Happened())
   {
      // no longer want the EA to run 
      EAEnabled = false;
   }
   // more processing ...
}
 
bool Something_Bad_Happened()
{
   // lost too much money..
   // ...
   return (true);  // quit immediately, so EA does nothing

}
  • #12
  • Dec 2, 2012 4:41am Dec 2, 2012 4:41am
Quote
I want to control the max loss of an EA

See attachments to what I just found. Awsome tool! You can set it for min. or max. profit, but also to protect your equity. Going to test this ea coming week.

Almost sure this is what you're looking for.
Attached File(s)
File Type: ex4 EquityGuard1.1.ex4   13 KB | 901 downloads
  • #13
  • Last Post: Nov 18, 2017 1:11am Nov 18, 2017 1:11am
Equity Guard is best to Stop All running EA's automatically. You set a maximum/minimum equity target and sleep. Once target will be hit, it will close all EA's including itself and will stop trading.
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