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How call a system application in onTick and wait until it finishes sth like. ShellExecuteW or ShellExecuteA?

I need an to call a python script in my expert adviser when OnTick occurs which I did via ShellExecuteW. However, I need to EA to wait until ShellExecuteW finishes its job. Is that doable ? I have read this too... https://www.mql5.com/en/forum/285244 Apparently the right way is : if

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Is there any library for handling creating and using complex data structures (eg. list queue stack) in mql?

hi, I come from computer science background and I see it can get tricky to develop complex algorithms in pure MQL. Is there any library for handling creating and using complex data structures (eg. list queue stack) in mql

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mt4 terminal cannot run strategy tester from command... :-(

Dear All, I am trying to run strategy tester for mt4 from command line to see how parameter changes would impact back-test results. I have found this link also I found a help topic "Configuration at start up"... so I followed the help topic at it was the same as the one in the aforementioned

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IsTradeAllowed : in what cases IsTradeAllowed can be helpful? what is the rational behind it?

I have been trying to find out what is the use of IsTradeAllowed function? in the definition it say " Checks if the Expert Advisor is allowed to trade and trading context is not busy. " does that mean all trading Expert Advisers share the same context for all terminals/currency pairs? Thank you

6

how is the moving average calculated by iATR ?

hello all, I am supposed to re-implement iATR in Python cuz we want to show its values on web. I have been trying to do this as described by the wiki page https://en.wikipedia.org/wiki/Average_true_range But, unfortunately the numbers don't match up. Can somebody please confirm if how the ATR is

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isoptimization doesn't seem to work for me....!!!

Hi All, I am new MQL4/5 .... I am just running tests at the moment to familiarize myself with function etc... https://docs.mql4.com/check/isoptimization I tried the below EA code in the optimization mode given the below settings in strategy tester as attached. although, I have the below code in EA

3

how to set the indicator's input parameter from an Expert Adviser

I calling an indicator in my EA using iCustom, and the indicator has an input parameter . How can back-test the EA using different input values of the indicator's input parameter... Of course I can set a default value and compile the indicator with different default input values. But, I don't want

4

How to prevent / avoid 138 error reqoute

Dear All, It has been 3-4 weeks since I started coding in mq4. I have developed an EA which creates buy/sell orders. I used slippage = 3, but, since I used to get error 138 reqoute most of the time I came up with below idea for both ordersend and orderclose as attached: I would like an expert to