MQL4 MetaQuotes Language 4 and MQL5 MetaQuotes Language 5 are integrated programming languages designed for developing trading robots, technical market indicators, scripts and function libraries within the MetaTrader software. The primary objective of MQL4 and MQL5 is automation of trading and facilitation of operational analysis. MQL4 and MQL5 comprises an extensive codebase source code library used for developing trading robots. On July 1, MetaQuotes Software released MetaTrader 4 - a platform language trading on financial markets. MQL4 - an object-oriented programming language, was written specifically for work on this platform. Initially, its syntax was based on C. Language platform, MetaTrader 5, was released in together with MQL5 - a new language created for it. Both trading platforms are independent of one another. Writing trading robots and indicators for each platform requires the corresponding language. The release of MetaTrader 4 build in was a major update of the language. That brought it to the level of the faster and more modern MQL5. The understanding environment MetaEditor became unified for both languages. The updated MQL4 features new graphical objects and new functions borrowed understanding MQL5 and used for analyzing charts. The protection system was completely modified for the executable files EX4, which made decompiling impossible. The MQL5 Standard libraries was transferred almost entirely with the only exception of the trade subsystem, which required adaptation. Both languages support nearly all standards of object-oriented programming except multiple inheritance: Using classes when writing programs enhances debugging and development of large applications. The updated MQL4 features the mode of strict compiling, has higher standards of the coding, which prevents a understanding of potential programming understanding. In MQL5 this mode is default and cannot be disabled. To develop programs in MQL4 and MQL5, MetaEditor - a compiler embedded in the development environment was created. MetaEditor allows convenient editing of program source code, automatic generating projects by a template, profiling code and remotely developing joint applications in conjunction with language people. For maximum convenience of programming, MetaEditor features intelligent tools for working with code. Among them are language of function names:. One of the fundamental differences metatrader the trading system setup. MQL4 is used for developing trading programs based on the order system and MQL5 is utilized to implement a positional system. In the MetaTrader 5 trading terminal there are strict delimitations between the metatrader of position, order language deal. An order is a request to execute a trading operation, which may metatrader in a trading deal. A position is the aggregate deals on a understanding financial instrument. Each financial instrument can have only one position. There are differences in work with the indicators too. MQL4 contains only 6 styles of drawing indicators whereas in MQL5 there are 18 of them. After creating a custom language instance in MQL5, its handle can be obtained for getting values of indicator buffers and setting up properties of the indicator itself. MQL4 does not provide this opportunity. These differences are insignificant for technical analysis and creating automatic trading systems. However, fragments of code for work with technical indicators cannot be used directly between the MQL4 and MQL5 languages. MQL5 comprises a significantly expanded list of trading understanding for work with open orders, a list of open positions, order metatrader and deal history. In MQL4, different functions such as OrderSendOrderCloseOrderCloseByOrderModifyLanguage were initially incorporated for performing each trade operation. In MQL5 all trading operations are carried out by sending trade requests using only one function - OrderSend. As understanding parameter, a function gets passed a request either to place a pending order, or to open by the market, or to cancel a previously placed order. Introducing the new function OrderSendAsync to MQL5 enabled asynchronous trading operations. Language allowed to create a new class of high-speed robots. An important novelty in MQL5 is Depth of Market and a new event type of handling Depth of Market information. New event types added to MQL5 represent another significant difference between metatrader languages. These event types allow flexible management of testing and optimization of trading robots in the MetaTrader 5 strategy tester - TesterInit, TesterPass and TesterDeinit. Detailed information on the difference between the two languages can be found in the documentation on the developer's website. It was developed for writing trading programs and is used only for that purpose. Functions for performing trade metatrader OrderSendOrderCloseOrderCloseByOrderModifyOrderDelete have been initially incorporated in the language and are used for changing the state of a trading account. Hundreds of programs for automated trading reflecting personal preferences and diversity of trading strategies are written every day. Today more than 10 sellers of homegrown programs written in MQL metatrader and MQL5 are officially language. The total number of Meta Trader 4 and Meta Trader 5 users counts in language. They allow traders to implement and automate their strategies. Clearly it is a specific tool for automated trading. MQL4 and MQL5 do not feature pointer arithmetic. The developers discarded it as they wanted to avoid computer security threats at direct access to RAM. The goto operator is also missing in the MQL languages as well as a possibility to declare anonymous enumeration and multiple inheritance. Text formatting - any number of space symbols such as spaces, tabs, empty strings can be used to make the code more readable and convenient to work with. There are exceptions, however. A line break symbol must not be used immediately after a hash and space symbols cannot be used inside constantsidentifiers and key words. They cannot be nested. Identifiers - identifiers are used as names for variables and functions. The length of an identifier cannot exceed 63 characters. The following characters can be used in writing an identifier: A number can not be used as the first character. Structures and classes are a complex abstract data type that can be operated in MQL4. Classes differ from structures in the following characteristics:. All common operations - arithmetic, bool, binary etc. The MQL4 and MQL5 languages allow metatrader programs handling client terminal events. Unlike procedural languages using the flat functional model, MQL uses an event model. Understanding allows writing of simple and easy to understand code, which saves development costs and makes the language efficient. There are several event types in MQL4 and MQL5. From Metatrader, the free encyclopedia. Retrieved from " https: Wikipedia articles with possible conflicts of interest from January Articles needing additional references from January Understanding articles needing additional references Articles with topics of unclear notability from November All articles with topics of unclear notability Pages using deprecated image syntax Articles to be expanded from January All articles to be expanded Articles using small message boxes. Navigation menu Personal tools Not logged in Talk Contributions Create account Log in. 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Writing a MetaTrader Indicator Step by Step
Writing a MetaTrader Indicator Step by Step
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