Section 2 - Sample EA
The first criticism, is the EA (the EA, we will discuss
the new custom indicator and the script).
To start making EA, after the entry MetaEditor, select
File -> New -> select Expert Advisor, and enter
the Link.
and you will get some code like this:
code:
//+------------------------------------------------------------------+
//| expert initialization function |
//+------------------------------------------------------------------+
int init()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| expert deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| expert start function |
//+------------------------------------------------------------------+
int start()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
that in the init () is run at 1x EA first time in drag
to chart
that in the deinit () is run at 1x EA remove from the
chart, or chart is closed
that in the start () is executed each tick (each have
new rates)
well, see EA super simple following:
code
extern double Lots=0.1;
extern int StopLoss=100;
extern int TakeProfit=150;
extern string txComment="Order EA1";
extern int MagicNumber=12345;
extern int Slippage=5;
//+------------------------------------------------------------------+
//| expert initialization function |
//+------------------------------------------------------------------+
int init()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| expert deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| expert start function |
//+------------------------------------------------------------------+
int start()
{
//----
if (OrdersTotal()==0)
{
if (iClose(Symbol(),0,1) > iMA(Symbol(),0,10,0,MODE_EMA,PRICE_CLOSE,1) )
{
OrderSend(Symbol(),OP_BUY,Lots,Ask,Slippage,Ask-StopLoss*Point,Ask+TakeProfit*Point,txComment,MagicNumber);
}
else if (iClose(Symbol(),0,1) < iMA(Symbol(),0,10,0,MODE_EMA,PRICE_CLOSE,1)
)
{
OrderSend(Symbol(),OP_SELL,Lots,Bid,Slippage,Bid+StopLoss*Point,Bid-TakeProfit*Point,txComment,MagicNumber);
}
}
//----
return(0);
}
//+------------------------------------------------------------------+
EA this logic, kira2 (eg, EA is placed in the GBPUSD
chart 1 Hour) If you do not have a position, if the
candle hours ago closenya above 10 EMA, then buy, if
the candle hours ago closenya below EMA 10, then sell.
about it like this ...... buy in the open the candle
be the arrow (the candle closed above the previous EMA)
at 1.7366 and close at 1.7516 (150 pips TP) ...
should be able to buy its price is 1.7369 and TP at
1.7519, but its core is about such
we try to study one by one part of it ..... explanation
on this topic at a glance aja ... details will be explained
later in each section.
code:
extern double Lots=0.1;
extern int StopLoss=100;
extern int TakeProfit=150;
extern string txComment="Order EA1";
extern int MagicNumber=12345;
extern int Slippage=5;
quite clearly is yes
extern essentially a variable that can be changed by
end users who do not have access to source code EA.
code:
if (OrdersTotal()==0)
If all order = 0, which means that under the command
(in the ()) will be executed if there is no order at
all.
order is considered a good open position (buy / sell),
or pending orders.
code:
if (iClose(Symbol(),0,1) > iMA(Symbol(),0,10,0,MODE_EMA,PRICE_CLOSE,1)
)
iClose () function to retrieve the price of the candle
close (details will be explained in other parts)
syntax on this, he means taking a close price of the
pair in which the EA attach, 1 candle before now.
IMA () that take a value of moving average, which means
that this syntax in the period EMA 10 is calculated
from the price close, 1 hour before now (though the
same time a candle than ama)
code:
OrderSend(Symbol(),OP_BUY,Lots,Ask,Slippage,Ask-StopLoss*Point,Ask+TakeProfit*Point,txComment,MagicNumber);
OrderSend () is used to do the order, will be explained
later in other parts, including the use of catch its
error does not occur so that the tragedy of the log
file size
else if underneath it and the same, the signs are that
it be reversed ..
.........
simple eh? .. so simple, it's EA is also very simple.
No money management, there is no trailling stop it,
no error is Catcher, etc. but it is EA's most simple,
in the later part of the next described further details
about the function-function ...
Hopefully useful to all
of us ..
Click the register when
you are ready!
Section
3 - The Syntax and Basics: the variable and comments.
|
Back to Learn MQL4
