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MQL5 ReferenceTimeseries and Indicators AccessiHighest 

iHighest

Returns the index of the highest value found on the corresponding chart (shift relative to the current bar).

int  iHighest(
   const string        symbol,              // Symbol
   ENUM_TIMEFRAMES     timeframe,           // Period
   ENUM_SERIESMODE     type,                // Timeseries identifier
   int                 count=WHOLE_ARRAY,   // Number of elements
   int                 start=0              // Index
  );

Parameters

symbol

[in]  The symbol, on which the search will be performed. NULL means the current symbol.

timeframe

[in]  Period. It can be one of the values of the ENUM_TIMEFRAMES enumeration. 0 means the current chart period.

type

[in]  The identifier of the timeseries, in which the search will be performed. Can be equal to any value from ENUM_SERIESMODE.

count=WHOLE_ARRAY

[in]  The number of elements in the timeseries (from the current bar towards index increasing direction), among which the search should be performed.

start=0

[in]  The index (shift relative to the current bar) of the initial bar, from which search for the highest value begins. Negative values ​​are ignored and replaced with a zero value.

Return Value

The index of the highest value found on the corresponding chart (shift relative to the current bar) or -1 in case of an error. For error details, call the GetLastError() function.

Example:

   double val;
//--- Calculation of the highest Close value among 20 consecutive bars
//--- From index 4 to index 23 inclusive, on the current timeframe
   int val_index=iHighest(NULL,0,MODE_CLOSE,20,4);
   if(val_index!=-1) 
      val=High[val_index];
   else 
      PrintFormat("iHighest() call error. Error code=%d",GetLastError());