Passing variables from Indicator to EA

I am trying to see it up where I can have an order opened up when it hits an indicator line

I am wondering what is the best way to pass a buffer variable result to a variable in the EA? I have two indicators... each with 6 lines (each their own buffer)....

Thus, if price = result; open trade... and opening only one trade per line.... I have 4 lines and when line 1 is hit, I don't want it to open another trade at line 1... it can then hit line 2 and open a trade...

line 0 is the guiding line, it is a moving average line
at line 1, open base size lot
at line 2, open base size lot *2
at line 3, open base size lot *3
at line 4, open base size lot*6
at line 5, close the trade at stop loss
once it comes back to line 0, it will close all trades

so if base size lot is .01... then it would open up a .01 trade, .02 trade, .03 trade, and a .06 trade.... thus a lot size of .12 would be opened

Also, I can use an array to store how many times each line has been hit for ratio purposes, correct? And is there a way to start a clock when line 1 is hit until line 0 is hit? Thus, measure how long it takes to come back to the moving average line

Looks like a job for Global variables:

http://www.metatrader.info/node/93
http://www.forexbrace.com/content/view/116/52/

double GlobalVariableGet (string name)

so, I would need to define the variable as global for the indicator.... use the GlobalVariableGet() in the EA, correct?

I have this variable in the Indicator
MA_Buffer[i] = iMA( NULL, 0, MA_Period, MA_Shift, MA_Method, MA_Applied_Price, i);

double GlobalVariableSet ("line0", MA_Buffer[i] = iMA( NULL, 0, MA_Period, MA_Shift, MA_Method, MA_Applied_Price, i))

I want to pass it along to the EA

line0 = GlobalVariableGet("line0")

====================

Is this correct?

Within Indicator:
GlobalVariableSet("MyVariable", 12345.670);

Within EA:
double IndicatorVariable = GlobalVariableGet("MyVariable");

Do note that you can only pass "Double", strings not allowed.
So you have to be imaginative to compress your info into a real (fractional) number.

Thanks!

The buffers are double variables so that should work

use the icustom function to pull data from your indicator. No need for global variables. as long as each line is an external buffer it can be referenced with the icustom function.

I second magnumfreak's suggestion. you should avoid abusing global variables for such tasks. Do know that these variables that you set can be seen/used/set by any other indicator or EAs. Failure to control it's usage can be catastrophic.

use iCustom to get the values from the custom indicators

use Global variables to store program state values perhaps for trade continuation after the weekend or disaster recovery.

regards,
Zen

Ok...

so the indicator is looping with several buffers....

so when it comes to setting the open orders, I need to have something along the lines of:

something to have a continued check on price to see if it cross line 1 (do I need another bars counter in the EA?)

there is a line 1 above and a line 1 below.... so on the buy orders, I only have to worry about line 1 below.... on the sell orders line 1 above

if price = line 1 && no open trades on this line for this currency, open trade

What would be the best way to program this from pseudo into mq4 language?

With language for one line, I should be able to handle all the rest of the lines

Wow. These are great resources. I even managed to find some sample EAs on the second source that shows how you can use Global Variables.

Thanks for introducing those resources.