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MetaTrader 4 and MetaTrader 5 as such are different in many ways, however, the relevant programming languages only differ in parts. All you usually need is the knowledge of the programming language. It is nothing else than tens, hundreds or even thousands of lines of text in code that the trading platform translates into its language and on the basis of which it does what the code says. Program for executing one-time actions, including the execution of trade operations. For manual trading management, the order management toolbar is used.


If the function is missing, the program will end directly upon the signal to exit, like in the case of OnInit(). The principle of initiation and construction of custom functions will be shown in further episodes, however, it certainly will do no harm to have a look at what they can look like now. They are executed at the moment when they are initiated from other parts of the code that is currently being executed. This part of the program usually contains the largest part of the code and the execution of this part also employs the control the longest.

What is the MetaQuotes Language and what is it used for?

This means that the computer understands this type as an integer. Specific main special functions vary according to the program type. The main special function of this type is the function OnCalculate() which is also executed upon each incoming price.

Optimizing MetaTrader Expert Advisor to Trade on Certain Days of … – EarnForex News

Optimizing MetaTrader Expert Advisor to Trade on Certain Days of ….

Posted: Tue, 21 Feb 2023 06:24:46 GMT [source]

It allows not only to write a variety of systems, designed to operate in real time, but also create their own graphical tools to help you make trade decisions. MetaQuotes Language 4 is a programming language for developing trading robots, technical indicators, scripts, and function libraries for use on the MetaTrader 4 trading platform. Such applications significantly enhance traders’ abilities when performing operations in the Forex market. All these instruments significantly enhance traders’ abilities when trading Forex.

Trading robot programming language

You will be able to talk to authors of articles and programs or ask questions in the forum where you will certainly receive an answer from your colleagues. Contrary to built-in technical indicators, this kind of instruments can be programmed to execute any analytical algorithm. This article describes a class of operators known as logical operators.


Development of applications for MetaTrader 4 Client Terminal requires the knowledge of MQL4. This present textbook will help you create your own Expert Advisors, scripts and indicators and incarnate in them your ideas – your algorithms of profitable trading. The textbook is intended for a large number of readers without experience in programming that want to learn how to develop automated trading applications for MetaTrader 4 Client Terminal. The textbook is designed in such a method that to make learning MQL4 as convenient and consequent as possible. MetaQuotes Language 4 is a new integrated programming language for developing indicators and trading strategies for the free-of-charge online trading terminal named MetaTrader 4. Over a hundred of brokerage companies and banks use MetaTrader 4 online trading platform to provide their services for customers.

New MQL Program and Types of Programs in MQL4

However, please know that this isn’t the best method for viewing one, since the MetaTrader program is built specifically for using this file and displaying its information properly. It is a working EA that you can use to follow along with, as you learn. You can also alter it and use it as a basic template, so that you do not need to rewrite code every time.

After matching the binaries you might be able to reconstruct the source code into semi-readable MQL4 code. This means that after decompilation you should also deobfuscate the code to understand all underlying algorithms inside of it. Figure a) illustrates a one-dimensional set of values of an array variable, figure b) a two-dimensional one and figure c) a three-dimensional one. Fortunately, it will suffice for the purposes of this series to work with one-dimensional sets. However, this type of the global variable must not be confused with global variables which are available even for the entire terminal and all its other programs.

In the majority of cases, a program makes a trader’s job easier, eliminating the necessity of a constant tracking of market situations, sitting before a computer for a long period of time. It may also help to relieve nervous tension and to lower the number of errors appearing in periods of extreme emotional tension. The main advantage of applications is the possibility to make trades according to the algorithm set by the trader.

How to decompile ex4 file to mq4 [closed]

In other words, it can be used with the same name and current value in all parts of the program. The introduction of variables into the program is called declaration. To introduce a variable one has to only know the name and data type we wish to input. It is also interesting that of all of them, the program only uses three types, i.e. integers, decimals, and strings. The difference from other types is only in the size of memory the computer allocates to each value, and in the form, the data are presented to the user.

  • The introduction will be performed by writing the data type identifier and then the name of the variable.
  • The deletion takes care of various scenarios and shows error messages.
  • MQL4 syntax is similar to the syntax of C++, and this makes it easy to translate into it programs from modern programming languages.
  • The code is used to delete all orders after clicking on the button.

If you are creating an indicator, at the end of the wizard, you can specify the planned lines of the indicator with their style, color and name. We can leave the last three types out as we will not need them in this series. Since we already know everything about the MetaEditor, we can start creating our first program. Searchdisplays the results of the search in the document or in files. Therefore, to be safe, we need to make clear here that this series deals only with the MQL4 language which is, however, already very close to MQL5.

MQL vs. Metatrader 4 and 5

MQL4 is relatively simple and easy to master even for novice programmers. The platform has specialized MetaEditor application allowing users to quickly develop new MQL4 programs. Users can apply templates and reference data from the MQL4 Dictionary.

As evident from the last episode alrethics approval and market researchdy, the program first reads the header and then executes the function OnInit() if it is present. The usual progress of program execution among individual parts is marked in the diagram by a yellow line. Below the diagram, there is an explanation of the progress of program execution as performed by the computer. The following diagram offers a basic schematic of the parts contained in most programs.

Enumeration is one of the data types which only came into existence in MQL4 after the “grand unification”. This data type is used to create groups of data of the same type. We may assign values to the data, but we do not have to, as they will be assigned automatically. In this basic series, we more than likely will not need enumerations. We will be able to read about them in articles beyond the scope of this series. Logical value, or Bool value, is a data type represented by one of the values TRUE or FALSE.

Coding Languages for Forex Trading Automation – EarnForex News

Coding Languages for Forex Trading Automation.

Posted: Fri, 03 Feb 2023 03:28:51 GMT [source]

Now that ex4 are compiled programs and not byte code, it is much more difficult to decompile. We hope that you have found this article helpful and you are already looking forward to build your trading robot. This is because when you hover over a specific candlestick in Metatrader, a tooltip will show displaying exactly these details. At the same time, you can see the same details on the status bar to the right.

Modern House Design