Mt4/mql4 getting started to mastering EA tutorial lesson 4 - common functions of MQL language (IV) - common functions of K-line value

MQL There is a group of “ function ”, They look different from other functions , Is a different function , These are the following powerful “ function ”

Open[]、Close[]、High[]、Low[]、Time[]、Volume[]

General function names are followed by (), This alternative “ function ” After the name is [].

double Open[]

Function has only one integer argument , The function is to return one of the current chart transaction varieties K Linear Opening price

double Close[]

Function has only one integer argument , The function is to return one of the current chart transaction varieties K Linear Closing price

double High[]

Function has only one integer argument , The function is to return one of the current chart transaction varieties K Linear Highest price

double Low[]

Function has only one integer argument , The function is to return one of the current chart transaction varieties K Linear The lowest price

long Volume[]

Function has only one integer argument , The function is to return one of the current chart transaction varieties K Linear volume

datetime Time[]

Function has only one integer argument , The function is to return one of the current chart transaction varieties K Linear Time

The script instance

//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart() 
  {
     
   datetime time= Time[0];
   double open  = Open[0]; 
   double high  = High[0]; 
   double low   = Low[0]; 
   double close = Close[0];
   long volume  = Volume[0];
   
   Print("Current bar time: ",time);
   Print("Current bar open: ",open);
   Print("Current bar high: ",high);
   Print("Current bar low: ",low);
   Print("Current bar close: ",close);
   Print("Current bar volume: ",volume); 
  }

Instance running results

Verify the next data window

There are several different data , Because what is read is the current K Line column data , At present K The string column is still fluctuating , So the lowest price 、 Highest price 、 Closing price 、 Trading volume is variable .

Next, read the previous one K Line post , See if the data is consistent

Change the parameter to 1.

//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart() 
  {
     
   datetime time= Time[1];
   double open  = Open[1]; 
   double high  = High[1]; 
   double low   = Low[1]; 
   double close = Close[1];
   long volume  = Volume[1];
   
   Print("Current bar time: ",time);
   Print("Current bar open: ",open);
   Print("Current bar high: ",high);
   Print("Current bar low: ",low);
   Print("Current bar close: ",close);
   Print("Current bar volume: ",volume); 
  }

The printout results are consistent .

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