How can I create EA's which give only 1 alert per signal? | Forex Factory

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How can I create EA's which give only 1 alert per signal?

  • #1
  • First Post: Feb 27, 2016 5:55am Feb 27, 2016 5:55am
I'm currently learning the very basics of writing EA's, and have a quick question. I've tried creating an EA that gives an alert after a doji has formed, using the code

Inserted Code
//+------------------------------------------------------------------+
//|                                                        test2.mq4 |
//|                        Copyright 2015, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2015, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
  
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---
  
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
   double body = Open[1]-Close[1];
   double bodyabs = MathAbs(body);
      
   if(bodyabs <= 0.00050)
   {
      Alert("Doji");
      
   }
  
  }
//+------------------------------------------------------------------+

However, if there is a doji, this gives an alert every time there is a new tick. How can I get this to alert me ONCE PER OCCURRENCE of a doji candlestick?

Thanks
  • #2
  • Feb 27, 2016 6:20am Feb 27, 2016 6:20am
Quoting Ponzi Jr
I'm currently learning the very basics of writing EA's, and have a quick question. I've tried creating an EA that gives an alert after a doji has formed, using the code //+------------------------------------------------------------------+ //| test2.mq4 | //| Copyright 2015, MetaQuotes Software Corp. | //| https://www.mql5.com | //+------------------------------------------------------------------+ #property copyright "Copyright 2015, MetaQuotes Software Corp." #property link "https://www.mql5.com" #property version "1.00" #property strict //+------------------------------------------------------------------+...
Ponzi –
Look at the indicator that I just posted here
It has a function named NewBar(). Once you understand how it works you will know how to do it.
  • #3
  • Feb 27, 2016 6:29am Feb 27, 2016 6:29am
Quoting cyber1
{quote} Ponzi Look at the indicator that I just posted here It has a function named NewBar(). Once you understand how it works you will know how to do it.
Is the NewBar() function already defined in MT4, like OnTick() is, or do you have to define it manually?

Thanks for the response.
  • #4
  • Feb 27, 2016 6:36am Feb 27, 2016 6:36am
Quoting Ponzi Jr
{quote} Is the NewBar() function already defined in MT4, like OnTick() is, or do you have to define it manually? Thanks for the response.
Ponzi –
no it's not. Look at the last function in the WPR indicator.
  • #5
  • Feb 27, 2016 6:54am Feb 27, 2016 6:54am
Quoting cyber1
{quote} Ponzi no it's not. Look at the last function in the WPR indicator.
Okay, so does that mean that this code would work?

Inserted Code
//+------------------------------------------------------------------+
//|                                                   PAA (test).mq4 |
//|                        Copyright 2015, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2015, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
   
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---
   
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
   if(NewBar())
      
      {
      
      Alert("New Bar Formed");
      
      // Execute code to analyse last bar
      
      }
   
  }
//+------------------------------------------------------------------+

bool NewBar()
{
   static datetime lastbar;
   datetime curbar = Time[0];
   //Print("NewBar(). lastbar="+TimeToStr(lastbar,TIME_DATE|TIME_MINUTES)+"  curbar="+TimeToStr(curbar,TIME_DATE|TIME_MINUTES));
   if(lastbar!=curbar)
   {
      lastbar=curbar;
      return (true);
   }
   else
   {
      return(false);
   }
}

Thanks again for your advice.
  • #6
  • Last Post: Feb 27, 2016 7:02am Feb 27, 2016 7:02am
Quoting Ponzi Jr
{quote} Okay, so does that mean that this code would work? //+------------------------------------------------------------------+ //| PAA (test).mq4 | //| Copyright 2015, MetaQuotes Software Corp. | //| https://www.mql5.com | //+------------------------------------------------------------------+ #property copyright "Copyright 2015, MetaQuotes Software Corp." #property link "https://www.mql5.com" #property version "1.00" #property strict //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+...
Ponzi-
Yes, looks about right.
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