what is the best code for identifying a new bar ??

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what is the best code for identifying  a new bar ??
 
George Johnson: what is the best code for identifying  a new bar ??

This code will work on both MQL4 and MQL5:

// Check for New Bar
static datetime dtBarCurrent   = WRONG_VALUE;
       datetime dtBarPrevious  = dtBarCurrent;
                dtBarCurrent   = (datetime) SeriesInfoInteger( _Symbol, _Period, SERIES_LASTBAR_DATE );

       bool     boolNewBarFlag = ( dtBarCurrent != dtBarPrevious );

if( boolNewBarFlag ) { Print( "... do something ..." ); }
 

For a new bar test, Bars is unreliable (a refresh/reconnect can change number of bars on chart), volume is unreliable (miss ticks), Price is unreliable (duplicate prices and The == operand. - MQL4 programming forum.) Always use time.
          New candle - MQL4 programming forum #3 2014.04.04

I disagree with making a new bar function, because it can only be called once per tick. A variable can be tested multiple times.
          Running EA once at the start of each bar - MQL4 programming forum 2011.05.06

 

Hi, Here is example which I use in mql5 Expert Advisors,
This code identify when new bar is formed and execute the code only once.

Hope it helps you.

int totalBars;

void OnTick() {

   int bars = iBars(_Symbol, PERIOD_D1);
   if(cBars != bars)
     {
      /*** execute your code only once per period ***/
      totalBars = bars;
     }
}

If you are looking for something simply explained, check this out.

https://www.youtube.com/shorts/R17IjgiHdis

The code is from this short video.

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