We also need 2 additional variables. The first one is for converting the level of limits from points to nominal value point which is the minimum value by which the quote for a symbol can change. We proceed directly to opening a deal. We send a request using OrderSend , and write the result to the result variable.
There are two options for the development of events:. So, we have written several dozen lines of code and the trading robot is ready.
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I admit that it is not very functional yet, but it can serve as an excellent example of the fact that writing code does not require a lot of knowledge and significant effort. We compile the code and launch the Expert Advisor in the trading terminal. You can create a trading robot for the fifth version in a few clicks without actually writing a single line of code. Optionally, we indicate the author and his website or profile. Add the parameters of the advisor, if necessary: the symbol and the timeframe for trading. Double-clicking activates the parameter, clicking on the name or value of the variable allows you to change the proposed defaults.
You can set any symbol you want. I defined it as the current one, on the chart of which the EA will work.
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I set the timeframe at M15 to increase the likelihood of trading signals. Let's move on. Now we need to select a signal and settings for it. Here you can improvise and try different combinations of the signals suggested by the developers. These signals will generate events for the expert to make deals. You can add custom signals to this section, including those from monitoring on the mql5.
The following options are provided with the platform by default:. It is undesirable to choose too short periods if you need to reduce the number of false positives. We leave the current symbol.
Choose a different symbol here if your strategy involves trading the instrument depending on the behavior of some other one. I also set the timeframe at M We see that a signal has been added for the current symbol and timeframe, which will generate events for the EA.
Move on to the Trailing Stop mode. Here I have chosen a fixed size limit. I also set stop loss at points and take profit at points. Next, we can choose one out of five modes of money management for a trading account. Trading is available with:. Click Done and gain profit! We have created an Expert Advisor without writing a single line of code. Let's take a closer look and conduct a small analysis of the sources. Head of the table and attributes - everything is familiar. Then comes the inclusion of library modules.
Expert is our robot. Then the settings that include input variables that define the interface for interacting with the application.
Features of MQL4 and MQL5 programming languages
It looks familiar, doesn't it? Of course! We set them up in the Expert Advisor Generation Wizard. In the future, the default values may be changed here. Next, an automatic global variable of the CExpert type is declared, which is initialized with a default value. For an object, this means that the default constructor has been called.
In the body OnInit, the EA is initialized, signals and filters are created and initialized with the values specified in the settings.
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Below is the code from which I removed all the checks of the initialization results for success and the descriptors for validity in order to visually reduce the amount of code. Each of them simply calls the corresponding method of the CExpert class. Accordingly, you can add some specialized solutions to the generator and create some for any need in a few clicks.
Let's try to compile the code. To launch the strategy testing mode press Ctrl and F5 simultaneously or click the button in the graphical menu at the top. Control is transferred to the MetaTrader Client Terminal in the settings of the strategy tester. Then we select the file to test and configure the rest of the parameters: symbol, timeframe, history depth, balance and leverage of the trading account, etc.
There are many settings, and for each of them, there is a description in the reference file. For detailed information on settings and testing mode focus on the tester and press F1. To begin, press Start in the lower right corner of the tester and, if testing occurs without optimization, then you can select the visualization mode for your strategy. Do not hesitate to refer to the documentation to expand your knowledge in the question.
The main drawback lies in the very purpose of these languages. Only MetaTrader Client Terminal can launch the program for execution. There is no manual memory management. You still choose to create the variable on the stack or in dynamic scope, but in either case, you don't have access to its virtual address. He has much more merits. Low threshold of entry, especially if you already have experience in developing in statically typed languages. Support for object-oriented programming style: encapsulation and extensibility, inheritance, polymorphism and virtual methods of classes. It is possible to create templates for classes and functions, that is, parametric polymorphism.
All this allows the code to be reused many times. Free infrastructure includes a trading terminal, development environment, strategy tester, included libraries. Let us consider the transformation of updating a program from one version to another using the example of a robot, which was previously presented in this article in the section about the capabilities of the language.
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You won't be able to compile this code without changes, a lot of errors will occur when trying. Note that it is now easier to select a deal for any symbol in MQL5 using the built-in PositionSelect function, without having to search through all open deals. We use PositionSelect to check for an open position for a symbol. If there is no such one, then go inside the if body and prepare to send a request to open a deal. I will not now consider each of its fields separately. Let me just note that just like in MQL4, we have 4 out of 7 required parameters: trade symbol, volume, direction and deviation from the requested price.
We calculate the remaining three the opening price, stop loss and take profit depending on the direction of the transaction. We fill in the structure in order. Now there is no need to normalize floating-point numbers, so there is no need for the digit variable.
Sending a request in the latest version of the language looks much more concise.
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All information about the result of executing the OrderSend function is now returned to us in MqlTradeResult. I ended up with the following code after debugging and a series of tests. The size has not changed, although we made a change in the logic that required additional actions at the initialization stage in OnInit.
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Let's summarize. If you have basic knowledge of MQL, it will not be difficult to do it yourself. Further, I specially selected for you a number of the most common MQL questions and tried to answer them briefly and thoroughly.