METATRADER 4 LOT SIZE CALCULATOR EXPERT ADVISOR CODE

METATRADER 4 LOT SIZE CALCULATOR EXPERT ADVISOR CODE

This is done so that the code in the block may only be processed one time. The next line sets the module level variable ThisBarTrade equal to the current bar number ( Bars). When Bars != ThisBarTrade then the block of code is executed. Module level variables are declared at the top, just under the external declarations, like so: The simplest way to prevent an MT4 expert advisor from executing your MQL4 code more than once per bar is to declare a module level variable. Whichever method you use (event driven or endless loop), module level variables can help in preventing code reentry into a trade block. Because I tend to avoid endless loops unless special circumstances warrant, Basket_Stats.mq4 doesn't use endless loops. Endless loops are outside the scope of this tutorial and in my view are generally bad coding convention, but there are some legitamate uses for an endless loop such as for an indicator that tracks a basket of currencies, like Basket_Stats.mq4 or for placing, then modifying an order within a Metatrader script as is done in the Buy w/ SL & TP and Sell w/ SL & TP scripts. Note that it is possible to set up an expert advisor to run in an endless loop, to force it to calculate at a given time, like every 1 second. As each tick is processed, indicators and expert advisors are processed. A tick is a price change on the forex chart where your expert advisor is running.

This is easily accomplished by the use of a module level variable within the Metatrader MQL4 language.īy default, Metatrader 4 handles all data coming into the workstation tick by tick. A common desire when creating a forex MT4 expert advisor system or converting one to an MT4 expert advisor is to limit the ability to trade only once per bar.

Metatrader 4 lot size calculator expert advisor