MQL4 Program Structure
The programming structure and syntax resemble C language. The programming language has similar data types, operation & expressions, operators, function and variables declaration. It comes with preprocessor and predefined variables, init(), deinit() and start() which run your main program codes. Below are some important function that you will be using in your programming
This is a group of functions that provides trader with access to data of the datetime type. It comes with handy selection of available function for quick access to Day, Month, Year, TimeHour, TimeMinute and others. This is particular usefull if you wan to limit your program to run during certain quite hours or only selected weekdays of every week. You can also program block out date for news release that will major impact the currency price.
Technical Indicator Functions
This is a group of functions used specifically for technical chart trading. MQL comes with really to use indicator for more then 30+ custom indicator. The list includes and not limited to Simple Moving Average, Bollinger Bands, Commodity Channel Index, Moving Average Convergence/Divergence, Relative Strength Index, Stochastic, etc
This group of functions for executing trade related order and management of trade issues. You can execute trade open and trade close, selection of particular trade, retrieve the order history, change order parameters like stop loss, profit take, etc and also check the order status. The most commonly used are OrderSend(), OrderModify() and Orderclose().
This group of function is for management of account information. This is particular important if you are checking and limiting the account information and performing money management. You can create checking statement for account number, name and company. In additional, you can check account balance, equity, margin and leverage for calculating your lot size.
This group of function contains alert, comment and pop out message box to notify trader user of any issue for the program. I personally use it to alert low account balance to ask user to top up their trading account balance and alert user if they are not using the correct trading current for the Expert advisor, require them to double check.
Many programs may not use this as this may not be relevant to their trading strategy but I used it to store some account information, date, time and some trades order information. This is usefully if you want your program to pickup from last running state when encounter program crash, hang or power failure. I personally tested and find this very usefull when you running on VPS or dedicated server where power outage may happen at 0.1% (99.9% uptime) or maintenance time (where your server will be off and restart).
You can find my codes in my Best Forex Ranking Cook Book Zip files for working *.MQL4 files. For more information visit my website bestforexranking dot com.
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