How do we open a Buy or Sell order?
To open an order, you must understand how MQL5 does it.
Basically MQL5 has a builtin OrderSend() function.
Inside the Metatrader Help you will find this entry
|bool OrderSend(MqlTradeRequest& request
Okay, now we know that we have to handle a request and a result. But how can we put that knowledge into action?
First we need to declare an MqlTradeRequest like this:
Let’s assume we want to buy what is on the current chart. It should be a market order of 0.1 Lot (not less) without a Stop Loss or a Take Profit. If price moves more than 20 points, we don’t want to buy anymore.
How do we translate that wish into programming code?
There is a request type for that called ORDER_TYPE_BUY
myrequest.type = ORDER_TYPE_BUY;
it should be a market order
myrequest.action = TRADE_ACTION_DEAL;
We want no StopLoss and no Take Profit now
myrequest.sl =0 ; myrequest.tp =0 ;
that order should only take place within a slippage of 20 points
We want to buy what is on the current chart
myrequest.symbol = _Symbol;
and we want only 0.1 Lot
myrequest.volume = 0.1;
and if we get filled, we want only to get filled with the requestet LotSize all at once (Could come in handy once you start to trade a few thousand lots a day)
myrequest.type_filling = ORDER_FILLING_FOK;
That was not to hard to understand, was it?
Another hint: you might need to add this code if you get the “failed exchange buy invalid request error”
ZeroMemory(myrequest); ZeroMemory (myresult);
In STEP9 we will create a complete function that does exactly what we want…