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A few basic questions about expert advisors

  • #1
  • First Post: May 25, 2014 10:14am May 25, 2014 10:14am
1. When the 'print' function is used, where is the output printed? For example, see the code here:
Inserted Code
   if(Bars<100)
     {
      Print("bars less than 100");
      return;
     }
Where would "bars less than 100" be printed if the EA was run?

2. Is the # symbol used to denote a preprocessor directive in MQL in the same way it is in C++? It doesn't appear that the lines of code in the following example are preprocessor directives:
Inserted Code
#property copyright   "2005-2014, MetaQuotes Software Corp."
#property link        "http://www.mql4.com"

3. How do I download and open expert advisor's found online? I've tried downloading them to many different folders within the MetaTrader 4 program files, but I cannot seem to get them to appear in the MetaEditor. For example, I tried downloading an EA (that I found here on FF) named 'MfiRsi EA.ex4' to the folder shown in the screenshot below. I assumed that I'd then be able to locate and view this EA in the MetaEditor, but it was nowhere to be found. What am I doing wrong here?
Attached Image (click to enlarge)
Click to Enlarge Name: Capture5.PNG Size: 43 KB




Note: All code used in this thread is from the MACD sample algorithm included with MT4
  • #2
  • May 25, 2014 10:20am May 25, 2014 10:20am
1/ In the Expert tab (and its log file)

3/ In the new builds (600+), the folders for indicators and experts were moved in another location in your computer. To find the folders, open your new platform, then click File > Open Data Folder > MQ4 ... then in the MQ4 folder you will find the experts and indicators folders. Once your tools in the right folders, restart the platform.
MT4/MT5 EAs/Indicators/Alerts coder
  • #3
  • Last Post: May 27, 2014 11:06am May 27, 2014 11:06am
I had a couple more questions about EA's and thought it would be better to add them to this thread than to create a new thread...

1. When you create a new EA, the 'MQL Wizard' appears and gives you the following options:

Attachment

Attachment

What do these options do?

2. I've tried to create a very basic script (my first, so it doesn't really do much). At the moment, it only runs once, when executed, and then never again. Here it is:
Inserted Code
#property copyright ""
#property link      "http://www.mql5.com"
#property version   "1.00"
#property strict
double o = Open[0];
double c = Close[0];
double h = High[0];
double l = Low[0];
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
   if(o != c)
      {
      Alert("PRICE CHANGE");
      }
   if(o == c)
      {
      Alert("NO PRICE CHANGE");
      }  
      
  
  }    
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---
  
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
  
  }
//+------------------------------------------------------------------+

How do I make it so that every time a new bar appears, the alert tells me whether price has changed or not for the most recent candlestick?



Quoting FerruFx
1/ In the Expert tab (and its log file) 3/ In the new builds (600+), the folders for indicators and experts were moved in another location in your computer. To find the folders, open your new platform, then click File > Open Data Folder > MQ4 ... then in the MQ4 folder you will find the experts and indicators folders. Once your tools in the right folders, restart the platform.
Thanks for the response!!
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