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EA Running

  • #1
  • First Post: Oct 9, 2010 4:25pm Oct 9, 2010 4:25pm
In MT4 is there a way to detect if an EA is already running on another chart ?

Regards

Scoobs.
  • #2
  • Oct 9, 2010 4:39pm Oct 9, 2010 4:39pm
Go to the chart of the pair and look at the right hand corner. If there is an icon, thats for the EA. As the Window menu choice has a choice called "more windows" if you have lots of charts open. It will give you a listing of the pairs and the name of any EA attached to that chart.
  • #3
  • Oct 9, 2010 4:43pm Oct 9, 2010 4:43pm
Quoting CodeMeister
Go to the chart of the pair and look at the right hand corner. If there is an icon, thats for the EA. As the Window menu choice has a choice called "more windows" if you have lots of charts open. It will give you a listing of the pairs and the name of any EA attached to that chart.
Maybe i didnt explain very well.

I want the EA to automatically check to see if its not already loaded and running on another chart.

Scoobs.
  • #4
  • Oct 9, 2010 6:29pm Oct 9, 2010 6:29pm
I don't think there is a function like IsTesting() or IsDemo().

You could do this with some extra coding by using a Global variable that stores the name of the EA and currency pair. Another EA could check for the existence of the variable.
  • #5
  • Oct 9, 2010 6:31pm Oct 9, 2010 6:31pm
Quoting CodeMeister
I don't think there is a function like IsTesting() or IsDemo().

You could do this with some extra coding by using a Global variable that stores the name of the EA and currency pair. Another EA could check for the existence of the variable.
I thought global variable was only seen by an EA instance and not by others ?
  • #6
  • Oct 9, 2010 6:48pm Oct 9, 2010 6:48pm
a true global variable is available to everything in the platform on that computer.....

as codemiester mentioned, the global vairable could be set.... the ea could look on init and see what's currently running on the platform.....

then alert you if need be..... sometimes the same ea is wanted multiple times on the same pair and timeframe......


//---
//---

you can also code for different platforms running on different computers in different countries to be able to tell if the others are running and just what is.....

so, and this is extreme example, if the computer running in moscow lost internet connection, the one in los angeles would see and take over..... if those both lost connection another in austria could take over...... and so on......

redundant backups......

practical use would be if you had computers in your office, your home and son homes......h
to trade and code, keep both simple... no call to impress....h
  • #7
  • Oct 10, 2010 5:11am Oct 10, 2010 5:11am
Quoting scooby-doo
I thought global variable was only seen by an EA instance and not by others ?
There is a confusing conflict in terminology. They are not really variables in the usual sense (declared in the code), these other "global variables" are name-value pairs that can be accessed through a special API, they are accessible by all EAs in the running terminal, are persisted to disk and survive even an unclean shutdown (crash). They are accessed with GlobalVariableSet(), GlobalVariableGet() and a few other functions starting with GlobalVariable*. They should have given them a different name to avoid this confusion.
  • #8
  • Oct 10, 2010 1:29pm Oct 10, 2010 1:29pm
Quoting 7bit
There is a confusing conflict in terminology. They are not really variables in the usual sense (declared in the code), these other "global variables" are name-value pairs that can be accessed through a special API, they are accessible by all EAs in the running terminal, are persisted to disk and survive even an unclean shutdown (crash). They are accessed with GlobalVariableSet(), GlobalVariableGet() and a few other functions starting with GlobalVariable*. They should have given them a different name to avoid this confusion.
Do you think the following would work ?

if(CheckInstance)
{
double EA_RUNNING = GlobalVariableGet(WindowExpertName());
if(EA_RUNNING == 0)
{
GlobalVariableSet(WindowExpertName(),1);
CheckInstance = false;
}
if(EA_RUNNING != 0)
{
return(0);
}
}
  • #9
  • Oct 10, 2010 2:32pm Oct 10, 2010 2:32pm
Scooby,

I would use GlobalVariableCheck rather than Get.

Also important to remember to delete the Global Variable on deinit.

I am working on an EA at the indo forum that does this. It checks for the EA's existence on the same pair/TF and removes itself from the current chart if found to be running.
  • #10
  • Last Post: Oct 10, 2010 4:24pm Oct 10, 2010 4:24pm
Ok i have done it this way and it seems to work very well.

Thanks for everyones help.

Scoobs.
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File Type: mq4 Single_EA_Instance.mq4   2 KB | 441 downloads
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