Expert Advisor Programming by Andrew R. Young

EXPERT ADVISOR PROGRAMMING
Pending Order Close Function
Here's a function to close a single pending order. This will work on all pending order types, buy and
sell.
bool ClosePendingOrder(string argSymbol, int argCloseTicket, double argSlippage)
{
OrderSelect(argCloseTicket,SELECT_BY_TICKET);
if(OrderCloseTime() == 0)
{
while(IsTradeContextBusy()) Sleep(10);
bool Deleted = OrderDelete(argCloseTicket,Red);
if(Deleted == false)
{
int ErrorCode = GetLastError();
string ErrDesc = ErrorDescription(ErrorCode);
string ErrAlert = StringConcatenate("Close Pending Order - Error: ",
ErrorCode,": ",ErrDesc);
Alert(ErrAlert);
string ErrLog = StringConcatenate("Ticket: ",argCloseTicket,
" Bid: ",MarketInfo(argSymbol,MODE_BID),
" Ask: ",MarketInfo(argSymbol,MODE_ASK));
Print(ErrLog);
}
}
return(Deleted);
}
Stop Loss & Take Profit Calculation Functions
We're going to create a few short functions for calculating stop loss and take profit as discussed on
pages 25-30. We will pass our external variables indicating the stop loss or take profit in pips to our
function, as well as the order opening price. The return value of our function will be the actual stop
loss or take profit price.
Here's the function to calculate a buy stop loss in pips:
double CalcBuyStopLoss(string argSymbol, int argStopLoss, double argOpenPrice)
{
if(argStopLoss == 0) return(0);
double BuyStopLoss = argOpenPrice - (argStopLoss * PipPoint(argSymbol));
return(BuyStopLoss);
}
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