Expert Advisor Programming by Andrew R. Young

EXPERT ADVISOR PROGRAMMING
You should recognize these examples from before. Instead of checking the current bar, we will check
the bar that just closed, i.e. the previous bar. If you need to reference a bar previous to the last
closed bar, simply add the current shift parameter to BarShift:
double LastFastMA = iMA(NULL,0,FastMAPeriod,0,0,0,BarShift+1);
If you don't anticipate ever needing to run your expert advisor once per bar, you won't need to add
this code. But for many indicator-based trading systems, this can make your trading and back testing
results more reliable.
To control the execution of trades, we need to check the value of NewBar before the order placement
routines. We can do this using the if block we placed earlier for the timer:
// Begin trade block
if(TradeAllowed == true && NewBar == true)
{
// Buy Order
if(FastMA > SlowMA && BuyTicket == 0 && BuyOrderCount(Symbol(),MagicNumber) == 0)
{
// Buy order code omitted for brevity
}
// Sell Order
if(FastMA < SlowMA && SellTicket == 0 && SellOrderCount(Symbol(),MagicNumber) == 0)
{
// Sell order code omitted for brevity
}
} // End trade block
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