Discussion of article "Writing an Expert Advisor using the MQL5 Object-Oriented Programming approach"

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New article Writing an Expert Advisor using the MQL5 Object-Oriented Programming approach is published:

This article focuses on the object oriented approach to doing what we did in the article "Step-By-Step Guide to writing an Expert Advisor in MQL5 for Beginners" - creating a simple expert advisor. Most people think this is difficult, but I want to assure you that by the time you finish reading through this article, you will be able to write your own Expert Advisor which is object oriented based.

Author: Samuel

 

Hi  thanks for the well laid out example.

 But I have to ask is it right?  

 In the EA it is checking for a trade opportunity at the start of each new bar. 

In the class function  getbuffers() it retrieves the last 3 bars data starting at the current bar 0 which has only just been formed and therefore the value is errornous.

 void MyExpert::getBuffers()
  {
   if(CopyBuffer(ADX_handle,0,0,3,ADX_val)<0 || CopyBuffer(ADX_handle,1,0,3,plus_DI)<0
      || CopyBuffer(ADX_handle,2,0,3,minus_DI)<0 || CopyBuffer(MA_handle,0,0,3,MA_val)<0)

 

Should it not be retrieving the last 3 bars indicator data starting at position 1?

thanks

 

Great Article Samuel

Thank you in advance for this priceless article,

So based on this article, we could include functions such as IsNewBar or Buy_opened to the class and just calling it from EA.

Thank you again,

I hope seeing more article from you,

Hamed, 

 

Amazing article!  I did not read entire thing yet, but already I can say that it is much much more helpful than 

anything I have seen thus far.  Thank you so very much :-)

 Spencer 

 

   if(base_currency=="USD")

     {

      one_lot_price=contract_size/levrage;

     }

   else

     {

      double bprice= SymbolInfoDouble(symbol,SYMBOL_BID);

      one_lot_price=bprice*contract_size/levrage;

     }


Marvelous thread. thank you very much.


There is some math mistakes.

assume the pair is cadchf?? 

also you assume constant leverage for all symbols. most brokers have different leverages for some pairs.

\any way the correct rule for any pair for the margin of 1 lots is Margin in account currenct is: C*Lots*YYYDDD

YYY is the base currency, DDD: Domination currency\

things will go fine with you until you reach CADCHF for example\

YYYDDD = CADUSD. --------------- not USDCAD is whown in the Marketwacth\\\


so you have to add third condition else-if

 

C=ContractSize/PairLeverage

 
very nice article.Thank you
 
Thanks. very helpful article. it helped me to introduce to EA developing very quickly.
 

Thanks @Samuel Olowoyo for this amazing article. Although this article is written 10 yrs back but it still hold ground for budding EA coders.

Are you still active on MQL5? I can only see 4 articles published by you (all published in 2010) 

 
Thank you , Thank you , Thank you. I had already written out the code for my EA without understanding the power of OOP, but rest assured it will be much cleaner after reading this. lol Very well done
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