Top 10 popular functions in MQL program language
1. Calculate point
double pipValue = CalculatePipValue(Symbol);
//Market Pip value calculation
double CalculatePipValue(string _parity)
{
int digit = MarketInfo(_parity, MODE_DIGITS);
if (digit == 2 || digit == 3) return 0.01;
else if (digit == 4 || digit == 5) return 0.0001;
}
2. Calculate slippage
int slippage = 10;
slippage = CalculateSlippage(Symbol, slippage);
//Calculate Slippage Value
int CalculateSlippage (string _parity, int _slippage)
{
int digit = MarketInfo(_parity, MODE_DIGITS);
if (digit == 2 || digit == 4) return _slippage;
else if (digit == 3 || digit == 5) return _slippage * 10;
}
3. Enter position
//Enter new trade
void EnterNewTrade(int _orderType)
{
//First variables are set as buy order
double orderEnterPrice = Ask;
string orderName = "Buy Order";
double orderStopLoss = orderEnterPrice - stopLoss * pipValue;
double orderTakeProfit = orderEnterPrice + takeProfit * pipValue;
//If the actual type of order is SELL then variables are set as sell order
if (_orderType == OP_SELL)
{
orderEnterPrice = Bid;
orderName = "Sell Order";
orderStopLoss = orderEnterPrice + stopLoss * pipValue;
orderTakeProfit = orderEnterPrice - takeProfit * pipValue;
}
//Enter Position
int ticketNumber = OrderSend(Symbol(), _orderType, lotSize, orderEnterPrice, slippage, orderStopLoss, orderTakeProfit, "HareketliOrtalamaAlgoritmesi", 0, 0, clrAliceBlue);
//Error Handling
if (ticketNumber == -1)
{
int errorCode = GetLastError();
string errorDefinition = ErrorDescription(errorCode);
string errorAlarm = StringConcatenate("Error Code: ", (string)errorCode, " Error Definition: ", (string)errorDefinition);
Alert(errorAlarm);
string hataLogu = StringConcatenate("Error: ", (string)Symbol(), " / ", orderName, " type order / Enter Price:",
(string)orderEnterPrice, " / ", (string)slippage, " / StopLoss:", (string)stopLoss, " / TakeProfit:", (string)takeProfit);
}
}
4. Close position
bool CloseOrder(int _orderNumber)
{
//Select order to close
if (OrderSelect(_orderNumber, SELECT_BY_TICKET, MODE_TRADES))
{
//set variable values as buy order
double orderClosingPrice = Bid;
string orderName = "Closing buy trade";
//If ordertype is sell then revise variable values
if (OrderType() == OP_SELL)
{
orderClosingPrice = Ask;
orderName = "Closing sell trade";
}
//Process done and ticketNumber is taken to check
int ticketNumber = OrderClose(_orderNumber, OrderLots(), orderClosingPrice, slippage, clrNONE);
//Error Handling
if (ticketNumber == -1)
{
int errorCode = GetLastError();
string errorDefinition = ErrorDescription(errorCode);
string errorAlarm = StringConcatenate("Error Code: ", (string)errorCode, " Error Definition: ", (string)errorDefinition);
Alert(errorAlarm);
string hataLogu = StringConcatenate("Error: ", (string)Symbol(), " / ", orderName, " type order / Enter Price:",
(string)orderEnterPrice, " / ", (string)slippage, " / StopLoss:", (string)stopLoss, " / TakeProfit:", (string)takeProfit);
return false;
}
else
{
return true;
}
}
}
5. Revise position
//Revise order
bool ReviseOrder(int _ticketNumber, double _newStopLoss, double _newTakeProfit)
{
if (OrderSelect(_ticketNumber, SELECT_BY_TICKET, MODE_TRADES))
{
int ticketNumber = OrderModify(OrderTicket(), OrderOpenPrice(), _ newStopLoss, _ newTakeProfit, 0, clrNONE);
//Error Handling
if (ticketNumber == -1)
{
int errorCode = GetLastError();
string errorDefinition = ErrorDescription(errorCode);
string errorAlarm = StringConcatenate("Error Code: ", (string)errorCode, " Error Definition: ", (string)errorDefinition);
Alert(errorAlarm);
string hataLogu = StringConcatenate("Error: ", (string)Symbol(), " / ", orderName, " type order / Enter Price:",
(string)orderEnterPrice, " / ", (string)slippage, " / StopLoss:", (string)stopLoss, " / TakeProfit:", (string)takeProfit);
return false;
}
else
{
return true;
}
}
}
6. Count open positions
//Count Open Orders
void CountOpenOrders()
{
sellCount = 0;
buyCount = 0;
for (int i = 0; i < OrdersTotal(); i++)
{
if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
{
if (OrderType() == OP_BUY)
{
buyCount++;
}
else if (OrderType() == OP_SELL)
{
sellCount++;
}
}
}
}
7. Count close positions
//Count Close Orders
void CountCloseOrders()
{
sellCount = 0;
buyCount = 0;
for (int i = 0; i < OrdersTotal(); i++)
{
if (OrderSelect(i, SELECT_BY_POS, MODE_HISTORY))
{
if (OrderType() == OP_BUY)
{
buyCount++;
}
else if (OrderType() == OP_SELL)
{
sellCount++;
}
}
}
}
8. Break even
//Break Even Algorithm
void BreakEven()
{
for (int i = 0; i < OrdersTotal(); i++)
{
if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
{
if (OrderType() == OP_BUY)
{
if (Ask >= (OrderOpenPrice() + breakEvenControl * pipValue) && OrderStopLoss() < OrderOpenPrice())
{
ReviseStopLoss(OrderTicket(), OrderOpenPrice() + breakEvenConstant * pipValue);
}
}
else if (OrderType() == OP_SELL)
{
if (Bid <= (OrderOpenPrice() - breakEvenControl * pipValue) && OrderStopLoss() > OrderOpenPrice())
{
ReviseStopLoss(OrderTicket(), OrderOpenPrice() - breakEvenConstant * pipValue);
}
}
}
}
}
//Stop Loss Revise
void ReviseStopLoss(int _orderNumber, double _newStopLoss)
{
if (OrderSelect(_orderNumber, SELECT_BY_TICKET, MODE_TRADES))
{
int controlNumber = OrderModify(OrderTicket(), OrderOpenPrice(), _newStopLoss, OrderTakeProfit(), 0, clrNONE);
}
}
9. Trailing stop
//Trail Algorithm
void Trail()
{
for (int i = 0; i < OrdersTotal(); i++)
{
if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
{
if (OrderType() == OP_BUY)
{
if (Ask > OrderStopLoss() + trail * pipValue && OrderStopLoss() >= OrderOpenPrice() + breakEven * pipValue)
{
ReviseStopLoss (OrderTicket(), Ask - trail * pipValue);
}
}
else if (OrderType() == OP_SELL)
{
if (Bid < OrderStopLoss() - trail * pipValue && OrderStopLoss() <= OrderOpenPrice() - breakEven * pipValue)
{
ReviseStopLoss (OrderTicket(), Bid + takipMesafesi * pipValue);
}
}
}
}
}
//Stop Loss Revise
void ReviseStopLoss(int _orderNumber, double _newStopLoss)
{
if (OrderSelect(_orderNumber, SELECT_BY_TICKET, MODE_TRADES))
{
int controlNumber = OrderModify(OrderTicket(), OrderOpenPrice(), _newStopLoss, OrderTakeProfit(), 0, clrNONE);
}
}
10. Close all positions
//Close All Open Orders
void CloseAllOpenOrders()
{
for (int i = 0; i < OrdersTotal(); i++)
{
if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES)
{
OrderClose(OrderTicket(), OrderLots(), OrderOpenPrice(), slippage, clrNONE);
}
}
}
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