Using global arrays like Open[], Close[], Low[], High[] in custom indicator for MetaTrader 5

[hsharghi]

Hi,

I'm converting an indicator written for MT4 to use it in MT5.

It has a lot in small functions which uses Open[], Close[], Low[] and High[] global arrays in MQL4. I found that there are no equivalent of them in MQL5. 

Any suggestion how can I use those arrays?

Hadi

[Fernando Carreiro]

hsharghi: Hi, I'm converting an indicator written for MT4 to use it in MT5. It has a lot in small functions which uses Open[], Close[], Low[] and High[] global arrays in MQL4. I found that there are no equivalent of them in MQL5. 

Any suggestion how can I use those arrays?

Both for MQL4+ and MQL5, the OnCalculate() event handler for Indicators. offers local arrays for quotes/rates data in the form of arrays. They are however in lowercase (open[], close[], low[], high[] , etc.).

int  OnCalculate(
   const int        rates_total,       // size of input time series
   const int        prev_calculated,   // number of handled bars at the previous call
   const datetime&  time{},            // Time array
   const double&    open[],            // Open array
   const double&    high[],            // High array
   const double&    low[],             // Low array
   const double&    close[],           // Close array
   const long&      tick_volume[],     // Tick Volume array
   const long&      volume[],          // Real Volume array
   const int&       spread[]           // Spread array
   );

[Laszlo Tormasi]

You can put this before your code. It's not mine but can't remember the origin. 

#define SERIES(name,type)                               \                            
class C##name                                           \
{                                                       \
public:                                                 \
type operator[](const int i){return i##name(NULL,0,i);} \                                                
}name;                                                  
SERIES(Open,double)
SERIES(Low,double)
SERIES(High,double)
SERIES(Close,double)
SERIES(Time,datetime)
SERIES(Volume,long)

[hsharghi]

Fernando Carreiro #:

Both for MQL4+ and MQL5, the OnCalculate() event handler for Indicators. offers local arrays for quotes/rates data in the form of arrays. They are however in lowercase (open[], close[], low[], high[] , etc.).

these arrays exists only inside OnCalculate() function. I cannot send all of them as function parameter to each one of functions that requires those values.

For example this function requires close and open arrays. 

int getCandleColorIndex(int pos) {
   return (Close[pos] > Open[pos]) ? 1 : (Close[pos] < Open[pos]) ? -1 : 0;
}

 

[hsharghi]

Laszlo Tormasi #:
You can put this before your code. It's not mine but can't remember the origin. 

Ha Ha! Nice!

It worked like a charm!

[William Roeder]

hsharghi #: What does this code do exactly? I couldn't get it!

It creates an object named Close, that has an operator [], that returns the close value of the bar index passed. Close[1] returns iClose(NULL,0, 1).