MT4 store values into Global Variables | Forex Factory

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MT4 store values into Global Variables

  • #1
  • First Post: Aug 3, 2012 6:11pm Aug 3, 2012 6:11pm
Hi,

Could somebody be so kind to show me how a custom made indicator or EA ?
would write indicator values to MT4's global variables

basicly what i need is
store the last 3 fractal values into global variables
store the 5,20,50 MA value into global variables
store the last bar high, low into global variables

Your help is highly apreiciated

Thank you !
  • #2
  • Aug 3, 2012 6:59pm Aug 3, 2012 6:59pm
Global Variables are very easy to use. What you are trying is possible but requires some planning to avoid problems with the shortcomings of Global Variables. First of all, you need to come up with a good naming scheme if you intend to store that much data otherwise you will never figure out what needs to be changed later. You should probably have separate vars for each pair and have the symbol as part of the name.

Second - globals only accept numeric values, no alphabetic characters. From your description you will avoid that restriction.

Third - keep the number of accesses to a minimum as this will enhance performance. I usually create/read the value at Init() time and update the value at Deinit() time.

I am not providing any code samples. The code I have written is very complicated and the logic is hard to follow. Plus my usage was very different to what you want.
  • #3
  • Aug 3, 2012 7:09pm Aug 3, 2012 7:09pm
thanks for the heads up
i don't know anything about coding
maybe you could show me a simple indicator i could apply to a chart
that would 'export' a 5ma value to the global variables
and i could see how it is done

thanks again !
  • #4
  • Aug 3, 2012 7:35pm Aug 3, 2012 7:35pm
I thought you had the basic skills of programming. What you are attempting is far too much for a non programmer. My explanation wouldn't make any sense and I don't intend to write a tutorial.
  • #5
  • Aug 3, 2012 8:03pm Aug 3, 2012 8:03pm
hey nico..... take a look at jason's ma alert for an example of how globals are 'set', 'get' and 'delete'....

a stripped down to nothing code example below...... it will place the values in the global list.......h

//---
//---

Inserted Code
 
#property indicator_chart_window
//+----
int init()
  {
   return(0);
  }
//+---
int deinit()
  {
   return(0);
  }
//+----
int start()
  {
   int    counted_bars=IndicatorCounted();
//----
 
    GlobalVariableSet("high",High[1]);
    GlobalVariableSet("low" ,Low[1]);
    
    GlobalVariableSet("five ma"  ,iMA(NULL,0, 5,0,0,0,1));
    GlobalVariableSet("twenty ma",iMA(NULL,0,20,0,0,0,1));
    GlobalVariableSet("fifty ma" ,iMA(NULL,0,50,0,0,0,1));

//----
   return(0);
  }
//+------------------------------------------------------------------+
to trade and code, keep both simple... no call to impress....h
  • #6
  • Aug 4, 2012 3:20am Aug 4, 2012 3:20am
Hayseed,

many thanks, this is all i needed
simply writing values to GV ,
some other program will use these values to update my SL

Thanks again !
  • #7
  • Last Post: Aug 5, 2012 10:13pm Aug 5, 2012 10:13pm
Quoting n!co
Hayseed,

many thanks, this is all i needed
simply writing values to GV ,
some other program will use these values to update my SL

Thanks again !
Nico, realize there is much, much more to it than just simply setting a value to global var... you have to tell it to retrieve the value, reset the value and so on.

Hayseeds example is very basic start point. Globals can be quite difficult for a newbie to get head around.

Your best bet is to find sample code and then play around with it. The more code you look the better you will get at it. But it's not easy for newbie.

Programming is more or less looking backwards because code runs top to bottom on every tick. You have to put things this natural order or your code is essentially not efficient if it takes more than 1 tick to perform all functions it needs to.

Programming loops will kill it. If it gets stuck in a loop it won't do anything. Very easy to do with setting and getting global variables. You have to think and plan these things very well and ensure there are no loops to get stuck in.
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